security/selinux/hooks.c

   1 /*
   2  *  NSA Security-Enhanced Linux (SELinux) security module
   3  *
   4  *  This file contains the SELinux hook function implementations.
   5  *
   6  *  Authors:  Stephen Smalley, <sds@epoch.ncsc.mil>
   7  *            Chris Vance, <cvance@nai.com>
   8  *            Wayne Salamon, <wsalamon@nai.com>
   9  *            James Morris <jmorris@redhat.com>
  10  *
  11  *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
  12  *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
  13  *  Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  14  *                          <dgoeddel@trustedcs.com>
  15  *
  16  *      This program is free software; you can redistribute it and/or modify
  17  *      it under the terms of the GNU General Public License version 2,
  18  *      as published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/config.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/errno.h>
  27 #include <linux/sched.h>
  28 #include <linux/security.h>
  29 #include <linux/xattr.h>
  30 #include <linux/capability.h>
  31 #include <linux/unistd.h>
  32 #include <linux/mm.h>
  33 #include <linux/mman.h>
  34 #include <linux/slab.h>
  35 #include <linux/pagemap.h>
  36 #include <linux/swap.h>
  37 #include <linux/smp_lock.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/syscalls.h>
  40 #include <linux/file.h>
  41 #include <linux/namei.h>
  42 #include <linux/mount.h>
  43 #include <linux/ext2_fs.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/kd.h>
  46 #include <linux/netfilter_ipv4.h>
  47 #include <linux/netfilter_ipv6.h>
  48 #include <linux/tty.h>
  49 #include <net/icmp.h>
  50 #include <net/ip.h>             /* for sysctl_local_port_range[] */
  51 #include <net/tcp.h>            /* struct or_callable used in sock_rcv_skb */
  52 #include <asm/uaccess.h>
  53 #include <asm/semaphore.h>
  54 #include <asm/ioctls.h>
  55 #include <linux/bitops.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/netdevice.h>    /* for network interface checks */
  58 #include <linux/netlink.h>
  59 #include <linux/tcp.h>
  60 #include <linux/udp.h>
  61 #include <linux/quota.h>
  62 #include <linux/un.h>           /* for Unix socket types */
  63 #include <net/af_unix.h>        /* for Unix socket types */
  64 #include <linux/parser.h>
  65 #include <linux/nfs_mount.h>
  66 #include <net/ipv6.h>
  67 #include <linux/hugetlb.h>
  68 #include <linux/personality.h>
  69 #include <linux/sysctl.h>
  70 #include <linux/audit.h>
  71
  72 #include "avc.h"
  73 #include "objsec.h"
  74 #include "netif.h"
  75
  76 #define XATTR_SELINUX_SUFFIX "selinux"
  77 #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
  78
  79 extern unsigned int policydb_loaded_version;
  80 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
  81
  82 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
  83 int selinux_enforcing = 0;
  84
  85 static int __init enforcing_setup(char *str)
  86 {
  87         selinux_enforcing = simple_strtol(str,NULL,0);
  88         return 1;
  89 }
  90 __setup("enforcing=", enforcing_setup);
  91 #endif
  92
  93 #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
  94 int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
  95
  96 static int __init selinux_enabled_setup(char *str)
  97 {
  98         selinux_enabled = simple_strtol(str, NULL, 0);
  99         return 1;
 100 }
 101 __setup("selinux=", selinux_enabled_setup);
 102 #endif
 103
 104 /* Original (dummy) security module. */
 105 static struct security_operations *original_ops = NULL;
 106
 107 /* Minimal support for a secondary security module,
 108    just to allow the use of the dummy or capability modules.
 109    The owlsm module can alternatively be used as a secondary
 110    module as long as CONFIG_OWLSM_FD is not enabled. */
 111 static struct security_operations *secondary_ops = NULL;
 112
 113 /* Lists of inode and superblock security structures initialized
 114    before the policy was loaded. */
 115 static LIST_HEAD(superblock_security_head);
 116 static DEFINE_SPINLOCK(sb_security_lock);
 117
 118 /* Allocate and free functions for each kind of security blob. */
 119
 120 static int task_alloc_security(struct task_struct *task)
 121 {
 122         struct task_security_struct *tsec;
 123
 124         tsec = kmalloc(sizeof(struct task_security_struct), GFP_KERNEL);
 125         if (!tsec)
 126                 return -ENOMEM;
 127
 128         memset(tsec, 0, sizeof(struct task_security_struct));
 129         tsec->magic = SELINUX_MAGIC;
 130         tsec->task = task;
 131         tsec->osid = tsec->sid = tsec->ptrace_sid = SECINITSID_UNLABELED;
 132         task->security = tsec;
 133
 134         return 0;
 135 }
 136
 137 static void task_free_security(struct task_struct *task)
 138 {
 139         struct task_security_struct *tsec = task->security;
 140
 141         if (!tsec || tsec->magic != SELINUX_MAGIC)
 142                 return;
 143
 144         task->security = NULL;
 145         kfree(tsec);
 146 }
 147
 148 static int inode_alloc_security(struct inode *inode)
 149 {
 150         struct task_security_struct *tsec = current->security;
 151         struct inode_security_struct *isec;
 152
 153         isec = kmalloc(sizeof(struct inode_security_struct), GFP_KERNEL);
 154         if (!isec)
 155                 return -ENOMEM;
 156
 157         memset(isec, 0, sizeof(struct inode_security_struct));
 158         init_MUTEX(&isec->sem);
 159         INIT_LIST_HEAD(&isec->list);
 160         isec->magic = SELINUX_MAGIC;
 161         isec->inode = inode;
 162         isec->sid = SECINITSID_UNLABELED;
 163         isec->sclass = SECCLASS_FILE;
 164         if (tsec && tsec->magic == SELINUX_MAGIC)
 165                 isec->task_sid = tsec->sid;
 166         else
 167                 isec->task_sid = SECINITSID_UNLABELED;
 168         inode->i_security = isec;
 169
 170         return 0;
 171 }
 172
 173 static void inode_free_security(struct inode *inode)
 174 {
 175         struct inode_security_struct *isec = inode->i_security;
 176         struct superblock_security_struct *sbsec = inode->i_sb->s_security;
 177
 178         if (!isec || isec->magic != SELINUX_MAGIC)
 179                 return;
 180
 181         spin_lock(&sbsec->isec_lock);
 182         if (!list_empty(&isec->list))
 183                 list_del_init(&isec->list);
 184         spin_unlock(&sbsec->isec_lock);
 185
 186         inode->i_security = NULL;
 187         kfree(isec);
 188 }
 189
 190 static int file_alloc_security(struct file *file)
 191 {
 192         struct task_security_struct *tsec = current->security;
 193         struct file_security_struct *fsec;
 194
 195         fsec = kmalloc(sizeof(struct file_security_struct), GFP_ATOMIC);
 196         if (!fsec)
 197                 return -ENOMEM;
 198
 199         memset(fsec, 0, sizeof(struct file_security_struct));
 200         fsec->magic = SELINUX_MAGIC;
 201         fsec->file = file;
 202         if (tsec && tsec->magic == SELINUX_MAGIC) {
 203                 fsec->sid = tsec->sid;
 204                 fsec->fown_sid = tsec->sid;
 205         } else {
 206                 fsec->sid = SECINITSID_UNLABELED;
 207                 fsec->fown_sid = SECINITSID_UNLABELED;
 208         }
 209         file->f_security = fsec;
 210
 211         return 0;
 212 }
 213
 214 static void file_free_security(struct file *file)
 215 {
 216         struct file_security_struct *fsec = file->f_security;
 217
 218         if (!fsec || fsec->magic != SELINUX_MAGIC)
 219                 return;
 220
 221         file->f_security = NULL;
 222         kfree(fsec);
 223 }
 224
 225 static int superblock_alloc_security(struct super_block *sb)
 226 {
 227         struct superblock_security_struct *sbsec;
 228
 229         sbsec = kmalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
 230         if (!sbsec)
 231                 return -ENOMEM;
 232
 233         memset(sbsec, 0, sizeof(struct superblock_security_struct));
 234         init_MUTEX(&sbsec->sem);
 235         INIT_LIST_HEAD(&sbsec->list);
 236         INIT_LIST_HEAD(&sbsec->isec_head);
 237         spin_lock_init(&sbsec->isec_lock);
 238         sbsec->magic = SELINUX_MAGIC;
 239         sbsec->sb = sb;
 240         sbsec->sid = SECINITSID_UNLABELED;
 241         sbsec->def_sid = SECINITSID_FILE;
 242         sb->s_security = sbsec;
 243
 244         return 0;
 245 }
 246
 247 static void superblock_free_security(struct super_block *sb)
 248 {
 249         struct superblock_security_struct *sbsec = sb->s_security;
 250
 251         if (!sbsec || sbsec->magic != SELINUX_MAGIC)
 252                 return;
 253
 254         spin_lock(&sb_security_lock);
 255         if (!list_empty(&sbsec->list))
 256                 list_del_init(&sbsec->list);
 257         spin_unlock(&sb_security_lock);
 258
 259         sb->s_security = NULL;
 260         kfree(sbsec);
 261 }
 262
 263 #ifdef CONFIG_SECURITY_NETWORK
 264 static int sk_alloc_security(struct sock *sk, int family, int priority)
 265 {
 266         struct sk_security_struct *ssec;
 267
 268         if (family != PF_UNIX)
 269                 return 0;
 270
 271         ssec = kmalloc(sizeof(*ssec), priority);
 272         if (!ssec)
 273                 return -ENOMEM;
 274
 275         memset(ssec, 0, sizeof(*ssec));
 276         ssec->magic = SELINUX_MAGIC;
 277         ssec->sk = sk;
 278         ssec->peer_sid = SECINITSID_UNLABELED;
 279         sk->sk_security = ssec;
 280
 281         return 0;
 282 }
 283
 284 static void sk_free_security(struct sock *sk)
 285 {
 286         struct sk_security_struct *ssec = sk->sk_security;
 287
 288         if (sk->sk_family != PF_UNIX || ssec->magic != SELINUX_MAGIC)
 289                 return;
 290
 291         sk->sk_security = NULL;
 292         kfree(ssec);
 293 }
 294 #endif  /* CONFIG_SECURITY_NETWORK */
 295
 296 /* The security server must be initialized before
 297    any labeling or access decisions can be provided. */
 298 extern int ss_initialized;
 299
 300 /* The file system's label must be initialized prior to use. */
 301
 302 static char *labeling_behaviors[6] = {
 303         "uses xattr",
 304         "uses transition SIDs",
 305         "uses task SIDs",
 306         "uses genfs_contexts",
 307         "not configured for labeling",
 308         "uses mountpoint labeling",
 309 };
 310
 311 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
 312
 313 static inline int inode_doinit(struct inode *inode)
 314 {
 315         return inode_doinit_with_dentry(inode, NULL);
 316 }
 317
 318 enum {
 319         Opt_context = 1,
 320         Opt_fscontext = 2,
 321         Opt_defcontext = 4,
 322 };
 323
 324 static match_table_t tokens = {
 325         {Opt_context, "context=%s"},
 326         {Opt_fscontext, "fscontext=%s"},
 327         {Opt_defcontext, "defcontext=%s"},
 328 };
 329
 330 #define SEL_MOUNT_FAIL_MSG "SELinux:  duplicate or incompatible mount options\n"
 331
 332 static int try_context_mount(struct super_block *sb, void *data)
 333 {
 334         char *context = NULL, *defcontext = NULL;
 335         const char *name;
 336         u32 sid;
 337         int alloc = 0, rc = 0, seen = 0;
 338         struct task_security_struct *tsec = current->security;
 339         struct superblock_security_struct *sbsec = sb->s_security;
 340
 341         if (!data)
 342                 goto out;
 343
 344         name = sb->s_type->name;
 345
 346         if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
 347
 348                 /* NFS we understand. */
 349                 if (!strcmp(name, "nfs")) {
 350                         struct nfs_mount_data *d = data;
 351
 352                         if (d->version <  NFS_MOUNT_VERSION)
 353                                 goto out;
 354
 355                         if (d->context[0]) {
 356                                 context = d->context;
 357                                 seen |= Opt_context;
 358                         }
 359                 } else
 360                         goto out;
 361
 362         } else {
 363                 /* Standard string-based options. */
 364                 char *p, *options = data;
 365
 366                 while ((p = strsep(&options, ",")) != NULL) {
 367                         int token;
 368                         substring_t args[MAX_OPT_ARGS];
 369
 370                         if (!*p)
 371                                 continue;
 372
 373                         token = match_token(p, tokens, args);
 374
 375                         switch (token) {
 376                         case Opt_context:
 377                                 if (seen) {
 378                                         rc = -EINVAL;
 379                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
 380                                         goto out_free;
 381                                 }
 382                                 context = match_strdup(&args[0]);
 383                                 if (!context) {
 384                                         rc = -ENOMEM;
 385                                         goto out_free;
 386                                 }
 387                                 if (!alloc)
 388                                         alloc = 1;
 389                                 seen |= Opt_context;
 390                                 break;
 391
 392                         case Opt_fscontext:
 393                                 if (seen & (Opt_context|Opt_fscontext)) {
 394                                         rc = -EINVAL;
 395                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
 396                                         goto out_free;
 397                                 }
 398                                 context = match_strdup(&args[0]);
 399                                 if (!context) {
 400                                         rc = -ENOMEM;
 401                                         goto out_free;
 402                                 }
 403                                 if (!alloc)
 404                                         alloc = 1;
 405                                 seen |= Opt_fscontext;
 406                                 break;
 407
 408                         case Opt_defcontext:
 409                                 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
 410                                         rc = -EINVAL;
 411                                         printk(KERN_WARNING "SELinux:  "
 412                                                "defcontext option is invalid "
 413                                                "for this filesystem type\n");
 414                                         goto out_free;
 415                                 }
 416                                 if (seen & (Opt_context|Opt_defcontext)) {
 417                                         rc = -EINVAL;
 418                                         printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
 419                                         goto out_free;
 420                                 }
 421                                 defcontext = match_strdup(&args[0]);
 422                                 if (!defcontext) {
 423                                         rc = -ENOMEM;
 424                                         goto out_free;
 425                                 }
 426                                 if (!alloc)
 427                                         alloc = 1;
 428                                 seen |= Opt_defcontext;
 429                                 break;
 430
 431                         default:
 432                                 rc = -EINVAL;
 433                                 printk(KERN_WARNING "SELinux:  unknown mount "
 434                                        "option\n");
 435                                 goto out_free;
 436
 437                         }
 438                 }
 439         }
 440
 441         if (!seen)
 442                 goto out;
 443
 444         if (context) {
 445                 rc = security_context_to_sid(context, strlen(context), &sid);
 446                 if (rc) {
 447                         printk(KERN_WARNING "SELinux: security_context_to_sid"
 448                                "(%s) failed for (dev %s, type %s) errno=%d\n",
 449                                context, sb->s_id, name, rc);
 450                         goto out_free;
 451                 }
 452
 453                 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
 454                                   FILESYSTEM__RELABELFROM, NULL);
 455                 if (rc)
 456                         goto out_free;
 457
 458                 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
 459                                   FILESYSTEM__RELABELTO, NULL);
 460                 if (rc)
 461                         goto out_free;
 462
 463                 sbsec->sid = sid;
 464
 465                 if (seen & Opt_context)
 466                         sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
 467         }
 468
 469         if (defcontext) {
 470                 rc = security_context_to_sid(defcontext, strlen(defcontext), &sid);
 471                 if (rc) {
 472                         printk(KERN_WARNING "SELinux: security_context_to_sid"
 473                                "(%s) failed for (dev %s, type %s) errno=%d\n",
 474                                defcontext, sb->s_id, name, rc);
 475                         goto out_free;
 476                 }
 477
 478                 if (sid == sbsec->def_sid)
 479                         goto out_free;
 480
 481                 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
 482                                   FILESYSTEM__RELABELFROM, NULL);
 483                 if (rc)
 484                         goto out_free;
 485
 486                 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
 487                                   FILESYSTEM__ASSOCIATE, NULL);
 488                 if (rc)
 489                         goto out_free;
 490
 491                 sbsec->def_sid = sid;
 492         }
 493
 494 out_free:
 495         if (alloc) {
 496                 kfree(context);
 497                 kfree(defcontext);
 498         }
 499 out:
 500         return rc;
 501 }
 502
 503 static int superblock_doinit(struct super_block *sb, void *data)
 504 {
 505         struct superblock_security_struct *sbsec = sb->s_security;
 506         struct dentry *root = sb->s_root;
 507         struct inode *inode = root->d_inode;
 508         int rc = 0;
 509
 510         down(&sbsec->sem);
 511         if (sbsec->initialized)
 512                 goto out;
 513
 514         if (!ss_initialized) {
 515                 /* Defer initialization until selinux_complete_init,
 516                    after the initial policy is loaded and the security
 517                    server is ready to handle calls. */
 518                 spin_lock(&sb_security_lock);
 519                 if (list_empty(&sbsec->list))
 520                         list_add(&sbsec->list, &superblock_security_head);
 521                 spin_unlock(&sb_security_lock);
 522                 goto out;
 523         }
 524
 525         /* Determine the labeling behavior to use for this filesystem type. */
 526         rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid);
 527         if (rc) {
 528                 printk(KERN_WARNING "%s:  security_fs_use(%s) returned %d\n",
 529                        __FUNCTION__, sb->s_type->name, rc);
 530                 goto out;
 531         }
 532
 533         rc = try_context_mount(sb, data);
 534         if (rc)
 535                 goto out;
 536
 537         if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
 538                 /* Make sure that the xattr handler exists and that no
 539                    error other than -ENODATA is returned by getxattr on
 540                    the root directory.  -ENODATA is ok, as this may be
 541                    the first boot of the SELinux kernel before we have
 542                    assigned xattr values to the filesystem. */
 543                 if (!inode->i_op->getxattr) {
 544                         printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
 545                                "xattr support\n", sb->s_id, sb->s_type->name);
 546                         rc = -EOPNOTSUPP;
 547                         goto out;
 548                 }
 549                 rc = inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
 550                 if (rc < 0 && rc != -ENODATA) {
 551                         if (rc == -EOPNOTSUPP)
 552                                 printk(KERN_WARNING "SELinux: (dev %s, type "
 553                                        "%s) has no security xattr handler\n",
 554                                        sb->s_id, sb->s_type->name);
 555                         else
 556                                 printk(KERN_WARNING "SELinux: (dev %s, type "
 557                                        "%s) getxattr errno %d\n", sb->s_id,
 558                                        sb->s_type->name, -rc);
 559                         goto out;
 560                 }
 561         }
 562
 563         if (strcmp(sb->s_type->name, "proc") == 0)
 564                 sbsec->proc = 1;
 565
 566         sbsec->initialized = 1;
 567
 568         if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) {
 569                 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), unknown behavior\n",
 570                        sb->s_id, sb->s_type->name);
 571         }
 572         else {
 573                 printk(KERN_INFO "SELinux: initialized (dev %s, type %s), %s\n",
 574                        sb->s_id, sb->s_type->name,
 575                        labeling_behaviors[sbsec->behavior-1]);
 576         }
 577
 578         /* Initialize the root inode. */
 579         rc = inode_doinit_with_dentry(sb->s_root->d_inode, sb->s_root);
 580
 581         /* Initialize any other inodes associated with the superblock, e.g.
 582            inodes created prior to initial policy load or inodes created
 583            during get_sb by a pseudo filesystem that directly
 584            populates itself. */
 585         spin_lock(&sbsec->isec_lock);
 586 next_inode:
 587         if (!list_empty(&sbsec->isec_head)) {
 588                 struct inode_security_struct *isec =
 589                                 list_entry(sbsec->isec_head.next,
 590                                            struct inode_security_struct, list);
 591                 struct inode *inode = isec->inode;
 592                 spin_unlock(&sbsec->isec_lock);
 593                 inode = igrab(inode);
 594                 if (inode) {
 595                         if (!IS_PRIVATE (inode))
 596                                 inode_doinit(inode);
 597                         iput(inode);
 598                 }
 599                 spin_lock(&sbsec->isec_lock);
 600                 list_del_init(&isec->list);
 601                 goto next_inode;
 602         }
 603         spin_unlock(&sbsec->isec_lock);
 604 out:
 605         up(&sbsec->sem);
 606         return rc;
 607 }
 608
 609 static inline u16 inode_mode_to_security_class(umode_t mode)
 610 {
 611         switch (mode & S_IFMT) {
 612         case S_IFSOCK:
 613                 return SECCLASS_SOCK_FILE;
 614         case S_IFLNK:
 615                 return SECCLASS_LNK_FILE;
 616         case S_IFREG:
 617                 return SECCLASS_FILE;
 618         case S_IFBLK:
 619                 return SECCLASS_BLK_FILE;
 620         case S_IFDIR:
 621                 return SECCLASS_DIR;
 622         case S_IFCHR:
 623                 return SECCLASS_CHR_FILE;
 624         case S_IFIFO:
 625                 return SECCLASS_FIFO_FILE;
 626
 627         }
 628
 629         return SECCLASS_FILE;
 630 }
 631
 632 static inline u16 socket_type_to_security_class(int family, int type, int protocol)
 633 {
 634         switch (family) {
 635         case PF_UNIX:
 636                 switch (type) {
 637                 case SOCK_STREAM:
 638                 case SOCK_SEQPACKET:
 639                         return SECCLASS_UNIX_STREAM_SOCKET;
 640                 case SOCK_DGRAM:
 641                         return SECCLASS_UNIX_DGRAM_SOCKET;
 642                 }
 643                 break;
 644         case PF_INET:
 645         case PF_INET6:
 646                 switch (type) {
 647                 case SOCK_STREAM:
 648                         return SECCLASS_TCP_SOCKET;
 649                 case SOCK_DGRAM:
 650                         return SECCLASS_UDP_SOCKET;
 651                 case SOCK_RAW:
 652                         return SECCLASS_RAWIP_SOCKET;
 653                 }
 654                 break;
 655         case PF_NETLINK:
 656                 switch (protocol) {
 657                 case NETLINK_ROUTE:
 658                         return SECCLASS_NETLINK_ROUTE_SOCKET;
 659                 case NETLINK_FIREWALL:
 660                         return SECCLASS_NETLINK_FIREWALL_SOCKET;
 661                 case NETLINK_TCPDIAG:
 662                         return SECCLASS_NETLINK_TCPDIAG_SOCKET;
 663                 case NETLINK_NFLOG:
 664                         return SECCLASS_NETLINK_NFLOG_SOCKET;
 665                 case NETLINK_XFRM:
 666                         return SECCLASS_NETLINK_XFRM_SOCKET;
 667                 case NETLINK_SELINUX:
 668                         return SECCLASS_NETLINK_SELINUX_SOCKET;
 669                 case NETLINK_AUDIT:
 670                         return SECCLASS_NETLINK_AUDIT_SOCKET;
 671                 case NETLINK_IP6_FW:
 672                         return SECCLASS_NETLINK_IP6FW_SOCKET;
 673                 case NETLINK_DNRTMSG:
 674                         return SECCLASS_NETLINK_DNRT_SOCKET;
 675                 case NETLINK_KOBJECT_UEVENT:
 676                         return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
 677                 default:
 678                         return SECCLASS_NETLINK_SOCKET;
 679                 }
 680         case PF_PACKET:
 681                 return SECCLASS_PACKET_SOCKET;
 682         case PF_KEY:
 683                 return SECCLASS_KEY_SOCKET;
 684         }
 685
 686         return SECCLASS_SOCKET;
 687 }
 688
 689 #ifdef CONFIG_PROC_FS
 690 static int selinux_proc_get_sid(struct proc_dir_entry *de,
 691                                 u16 tclass,
 692                                 u32 *sid)
 693 {
 694         int buflen, rc;
 695         char *buffer, *path, *end;
 696
 697         buffer = (char*)__get_free_page(GFP_KERNEL);
 698         if (!buffer)
 699                 return -ENOMEM;
 700
 701         buflen = PAGE_SIZE;
 702         end = buffer+buflen;
 703         *--end = '\0';
 704         buflen--;
 705         path = end-1;
 706         *path = '/';
 707         while (de && de != de->parent) {
 708                 buflen -= de->namelen + 1;
 709                 if (buflen < 0)
 710                         break;
 711                 end -= de->namelen;
 712                 memcpy(end, de->name, de->namelen);
 713                 *--end = '/';
 714                 path = end;
 715                 de = de->parent;
 716         }
 717         rc = security_genfs_sid("proc", path, tclass, sid);
 718         free_page((unsigned long)buffer);
 719         return rc;
 720 }
 721 #else
 722 static int selinux_proc_get_sid(struct proc_dir_entry *de,
 723                                 u16 tclass,
 724                                 u32 *sid)
 725 {
 726         return -EINVAL;
 727 }
 728 #endif
 729
 730 /* The inode's security attributes must be initialized before first use. */
 731 static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
 732 {
 733         struct superblock_security_struct *sbsec = NULL;
 734         struct inode_security_struct *isec = inode->i_security;
 735         u32 sid;
 736         struct dentry *dentry;
 737 #define INITCONTEXTLEN 255
 738         char *context = NULL;
 739         unsigned len = 0;
 740         int rc = 0;
 741         int hold_sem = 0;
 742
 743         if (isec->initialized)
 744                 goto out;
 745
 746         down(&isec->sem);
 747         hold_sem = 1;
 748         if (isec->initialized)
 749                 goto out;
 750
 751         sbsec = inode->i_sb->s_security;
 752         if (!sbsec->initialized) {
 753                 /* Defer initialization until selinux_complete_init,
 754                    after the initial policy is loaded and the security
 755                    server is ready to handle calls. */
 756                 spin_lock(&sbsec->isec_lock);
 757                 if (list_empty(&isec->list))
 758                         list_add(&isec->list, &sbsec->isec_head);
 759                 spin_unlock(&sbsec->isec_lock);
 760                 goto out;
 761         }
 762
 763         switch (sbsec->behavior) {
 764         case SECURITY_FS_USE_XATTR:
 765                 if (!inode->i_op->getxattr) {
 766                         isec->sid = sbsec->def_sid;
 767                         break;
 768                 }
 769
 770                 /* Need a dentry, since the xattr API requires one.
 771                    Life would be simpler if we could just pass the inode. */
 772                 if (opt_dentry) {
 773                         /* Called from d_instantiate or d_splice_alias. */
 774                         dentry = dget(opt_dentry);
 775                 } else {
 776                         /* Called from selinux_complete_init, try to find a dentry. */
 777                         dentry = d_find_alias(inode);
 778                 }
 779                 if (!dentry) {
 780                         printk(KERN_WARNING "%s:  no dentry for dev=%s "
 781                                "ino=%ld\n", __FUNCTION__, inode->i_sb->s_id,
 782                                inode->i_ino);
 783                         goto out;
 784                 }
 785
 786                 len = INITCONTEXTLEN;
 787                 context = kmalloc(len, GFP_KERNEL);
 788                 if (!context) {
 789                         rc = -ENOMEM;
 790                         dput(dentry);
 791                         goto out;
 792                 }
 793                 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 794                                            context, len);
 795                 if (rc == -ERANGE) {
 796                         /* Need a larger buffer.  Query for the right size. */
 797                         rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
 798                                                    NULL, 0);
 799                         if (rc < 0) {
 800                                 dput(dentry);
 801                                 goto out;
 802                         }
 803                         kfree(context);
 804                         len = rc;
 805                         context = kmalloc(len, GFP_KERNEL);
 806                         if (!context) {
 807                                 rc = -ENOMEM;
 808                                 dput(dentry);
 809                                 goto out;
 810                         }
 811                         rc = inode->i_op->getxattr(dentry,
 812                                                    XATTR_NAME_SELINUX,
 813                                                    context, len);
 814                 }
 815                 dput(dentry);
 816                 if (rc < 0) {
 817                         if (rc != -ENODATA) {
 818                                 printk(KERN_WARNING "%s:  getxattr returned "
 819                                        "%d for dev=%s ino=%ld\n", __FUNCTION__,
 820                                        -rc, inode->i_sb->s_id, inode->i_ino);
 821                                 kfree(context);
 822                                 goto out;
 823                         }
 824                         /* Map ENODATA to the default file SID */
 825                         sid = sbsec->def_sid;
 826                         rc = 0;
 827                 } else {
 828                         rc = security_context_to_sid(context, rc, &sid);
 829                         if (rc) {
 830                                 printk(KERN_WARNING "%s:  context_to_sid(%s) "
 831                                        "returned %d for dev=%s ino=%ld\n",
 832                                        __FUNCTION__, context, -rc,
 833                                        inode->i_sb->s_id, inode->i_ino);
 834                                 kfree(context);
 835                                 /* Leave with the unlabeled SID */
 836                                 rc = 0;
 837                                 break;
 838                         }
 839                 }
 840                 kfree(context);
 841                 isec->sid = sid;
 842                 break;
 843         case SECURITY_FS_USE_TASK:
 844                 isec->sid = isec->task_sid;
 845                 break;
 846         case SECURITY_FS_USE_TRANS:
 847                 /* Default to the fs SID. */
 848                 isec->sid = sbsec->sid;
 849
 850                 /* Try to obtain a transition SID. */
 851                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
 852                 rc = security_transition_sid(isec->task_sid,
 853                                              sbsec->sid,
 854                                              isec->sclass,
 855                                              &sid);
 856                 if (rc)
 857                         goto out;
 858                 isec->sid = sid;
 859                 break;
 860         default:
 861                 /* Default to the fs SID. */
 862                 isec->sid = sbsec->sid;
 863
 864                 if (sbsec->proc) {
 865                         struct proc_inode *proci = PROC_I(inode);
 866                         if (proci->pde) {
 867                                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
 868                                 rc = selinux_proc_get_sid(proci->pde,
 869                                                           isec->sclass,
 870                                                           &sid);
 871                                 if (rc)
 872                                         goto out;
 873                                 isec->sid = sid;
 874                         }
 875                 }
 876                 break;
 877         }
 878
 879         isec->initialized = 1;
 880
 881 out:
 882         if (isec->sclass == SECCLASS_FILE)
 883                 isec->sclass = inode_mode_to_security_class(inode->i_mode);
 884
 885         if (hold_sem)
 886                 up(&isec->sem);
 887         return rc;
 888 }
 889
 890 /* Convert a Linux signal to an access vector. */
 891 static inline u32 signal_to_av(int sig)
 892 {
 893         u32 perm = 0;
 894
 895         switch (sig) {
 896         case SIGCHLD:
 897                 /* Commonly granted from child to parent. */
 898                 perm = PROCESS__SIGCHLD;
 899                 break;
 900         case SIGKILL:
 901                 /* Cannot be caught or ignored */
 902                 perm = PROCESS__SIGKILL;
 903                 break;
 904         case SIGSTOP:
 905                 /* Cannot be caught or ignored */
 906                 perm = PROCESS__SIGSTOP;
 907                 break;
 908         default:
 909                 /* All other signals. */
 910                 perm = PROCESS__SIGNAL;
 911                 break;
 912         }
 913
 914         return perm;
 915 }
 916
 917 /* Check permission betweeen a pair of tasks, e.g. signal checks,
 918    fork check, ptrace check, etc. */
 919 static int task_has_perm(struct task_struct *tsk1,
 920                          struct task_struct *tsk2,
 921                          u32 perms)
 922 {
 923         struct task_security_struct *tsec1, *tsec2;
 924
 925         tsec1 = tsk1->security;
 926         tsec2 = tsk2->security;
 927         return avc_has_perm(tsec1->sid, tsec2->sid,
 928                             SECCLASS_PROCESS, perms, NULL);
 929 }
 930
 931 /* Check whether a task is allowed to use a capability. */
 932 static int task_has_capability(struct task_struct *tsk,
 933                                int cap)
 934 {
 935         struct task_security_struct *tsec;
 936         struct avc_audit_data ad;
 937
 938         tsec = tsk->security;
 939
 940         AVC_AUDIT_DATA_INIT(&ad,CAP);
 941         ad.tsk = tsk;
 942         ad.u.cap = cap;
 943
 944         return avc_has_perm(tsec->sid, tsec->sid,
 945                             SECCLASS_CAPABILITY, CAP_TO_MASK(cap), &ad);
 946 }
 947
 948 /* Check whether a task is allowed to use a system operation. */
 949 static int task_has_system(struct task_struct *tsk,
 950                            u32 perms)
 951 {
 952         struct task_security_struct *tsec;
 953
 954         tsec = tsk->security;
 955
 956         return avc_has_perm(tsec->sid, SECINITSID_KERNEL,
 957                             SECCLASS_SYSTEM, perms, NULL);
 958 }
 959
 960 /* Check whether a task has a particular permission to an inode.
 961    The 'adp' parameter is optional and allows other audit
 962    data to be passed (e.g. the dentry). */
 963 static int inode_has_perm(struct task_struct *tsk,
 964                           struct inode *inode,
 965                           u32 perms,
 966                           struct avc_audit_data *adp)
 967 {
 968         struct task_security_struct *tsec;
 969         struct inode_security_struct *isec;
 970         struct avc_audit_data ad;
 971
 972         tsec = tsk->security;
 973         isec = inode->i_security;
 974
 975         if (!adp) {
 976                 adp = &ad;
 977                 AVC_AUDIT_DATA_INIT(&ad, FS);
 978                 ad.u.fs.inode = inode;
 979         }
 980
 981         return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp);
 982 }
 983
 984 /* Same as inode_has_perm, but pass explicit audit data containing
 985    the dentry to help the auditing code to more easily generate the
 986    pathname if needed. */
 987 static inline int dentry_has_perm(struct task_struct *tsk,
 988                                   struct vfsmount *mnt,
 989                                   struct dentry *dentry,
 990                                   u32 av)
 991 {
 992         struct inode *inode = dentry->d_inode;
 993         struct avc_audit_data ad;
 994         AVC_AUDIT_DATA_INIT(&ad,FS);
 995         ad.u.fs.mnt = mnt;
 996         ad.u.fs.dentry = dentry;
 997         return inode_has_perm(tsk, inode, av, &ad);
 998 }
 999
1000 /* Check whether a task can use an open file descriptor to
1001    access an inode in a given way.  Check access to the
1002    descriptor itself, and then use dentry_has_perm to
1003    check a particular permission to the file.
1004    Access to the descriptor is implicitly granted if it
1005    has the same SID as the process.  If av is zero, then
1006    access to the file is not checked, e.g. for cases
1007    where only the descriptor is affected like seek. */
1008 static inline int file_has_perm(struct task_struct *tsk,
1009                                 struct file *file,
1010                                 u32 av)
1011 {
1012         struct task_security_struct *tsec = tsk->security;
1013         struct file_security_struct *fsec = file->f_security;
1014         struct vfsmount *mnt = file->f_vfsmnt;
1015         struct dentry *dentry = file->f_dentry;
1016         struct inode *inode = dentry->d_inode;
1017         struct avc_audit_data ad;
1018         int rc;
1019
1020         AVC_AUDIT_DATA_INIT(&ad, FS);
1021         ad.u.fs.mnt = mnt;
1022         ad.u.fs.dentry = dentry;
1023
1024         if (tsec->sid != fsec->sid) {
1025                 rc = avc_has_perm(tsec->sid, fsec->sid,
1026                                   SECCLASS_FD,
1027                                   FD__USE,
1028                                   &ad);
1029                 if (rc)
1030                         return rc;
1031         }
1032
1033         /* av is zero if only checking access to the descriptor. */
1034         if (av)
1035                 return inode_has_perm(tsk, inode, av, &ad);
1036
1037         return 0;
1038 }
1039
1040 /* Check whether a task can create a file. */
1041 static int may_create(struct inode *dir,
1042                       struct dentry *dentry,
1043                       u16 tclass)
1044 {
1045         struct task_security_struct *tsec;
1046         struct inode_security_struct *dsec;
1047         struct superblock_security_struct *sbsec;
1048         u32 newsid;
1049         struct avc_audit_data ad;
1050         int rc;
1051
1052         tsec = current->security;
1053         dsec = dir->i_security;
1054         sbsec = dir->i_sb->s_security;
1055
1056         AVC_AUDIT_DATA_INIT(&ad, FS);
1057         ad.u.fs.dentry = dentry;
1058
1059         rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR,
1060                           DIR__ADD_NAME | DIR__SEARCH,
1061                           &ad);
1062         if (rc)
1063                 return rc;
1064
1065         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1066                 newsid = tsec->create_sid;
1067         } else {
1068                 rc = security_transition_sid(tsec->sid, dsec->sid, tclass,
1069                                              &newsid);
1070                 if (rc)
1071                         return rc;
1072         }
1073
1074         rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad);
1075         if (rc)
1076                 return rc;
1077
1078         return avc_has_perm(newsid, sbsec->sid,
1079                             SECCLASS_FILESYSTEM,
1080                             FILESYSTEM__ASSOCIATE, &ad);
1081 }
1082
1083 #define MAY_LINK   0
1084 #define MAY_UNLINK 1
1085 #define MAY_RMDIR  2
1086
1087 /* Check whether a task can link, unlink, or rmdir a file/directory. */
1088 static int may_link(struct inode *dir,
1089                     struct dentry *dentry,
1090                     int kind)
1091
1092 {
1093         struct task_security_struct *tsec;
1094         struct inode_security_struct *dsec, *isec;
1095         struct avc_audit_data ad;
1096         u32 av;
1097         int rc;
1098
1099         tsec = current->security;
1100         dsec = dir->i_security;
1101         isec = dentry->d_inode->i_security;
1102
1103         AVC_AUDIT_DATA_INIT(&ad, FS);
1104         ad.u.fs.dentry = dentry;
1105
1106         av = DIR__SEARCH;
1107         av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
1108         rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad);
1109         if (rc)
1110                 return rc;
1111
1112         switch (kind) {
1113         case MAY_LINK:
1114                 av = FILE__LINK;
1115                 break;
1116         case MAY_UNLINK:
1117                 av = FILE__UNLINK;
1118                 break;
1119         case MAY_RMDIR:
1120                 av = DIR__RMDIR;
1121                 break;
1122         default:
1123                 printk(KERN_WARNING "may_link:  unrecognized kind %d\n", kind);
1124                 return 0;
1125         }
1126
1127         rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad);
1128         return rc;
1129 }
1130
1131 static inline int may_rename(struct inode *old_dir,
1132                              struct dentry *old_dentry,
1133                              struct inode *new_dir,
1134                              struct dentry *new_dentry)
1135 {
1136         struct task_security_struct *tsec;
1137         struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1138         struct avc_audit_data ad;
1139         u32 av;
1140         int old_is_dir, new_is_dir;
1141         int rc;
1142
1143         tsec = current->security;
1144         old_dsec = old_dir->i_security;
1145         old_isec = old_dentry->d_inode->i_security;
1146         old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1147         new_dsec = new_dir->i_security;
1148
1149         AVC_AUDIT_DATA_INIT(&ad, FS);
1150
1151         ad.u.fs.dentry = old_dentry;
1152         rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR,
1153                           DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1154         if (rc)
1155                 return rc;
1156         rc = avc_has_perm(tsec->sid, old_isec->sid,
1157                           old_isec->sclass, FILE__RENAME, &ad);
1158         if (rc)
1159                 return rc;
1160         if (old_is_dir && new_dir != old_dir) {
1161                 rc = avc_has_perm(tsec->sid, old_isec->sid,
1162                                   old_isec->sclass, DIR__REPARENT, &ad);
1163                 if (rc)
1164                         return rc;
1165         }
1166
1167         ad.u.fs.dentry = new_dentry;
1168         av = DIR__ADD_NAME | DIR__SEARCH;
1169         if (new_dentry->d_inode)
1170                 av |= DIR__REMOVE_NAME;
1171         rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
1172         if (rc)
1173                 return rc;
1174         if (new_dentry->d_inode) {
1175                 new_isec = new_dentry->d_inode->i_security;
1176                 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
1177                 rc = avc_has_perm(tsec->sid, new_isec->sid,
1178                                   new_isec->sclass,
1179                                   (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1180                 if (rc)
1181                         return rc;
1182         }
1183
1184         return 0;
1185 }
1186
1187 /* Check whether a task can perform a filesystem operation. */
1188 static int superblock_has_perm(struct task_struct *tsk,
1189                                struct super_block *sb,
1190                                u32 perms,
1191                                struct avc_audit_data *ad)
1192 {
1193         struct task_security_struct *tsec;
1194         struct superblock_security_struct *sbsec;
1195
1196         tsec = tsk->security;
1197         sbsec = sb->s_security;
1198         return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
1199                             perms, ad);
1200 }
1201
1202 /* Convert a Linux mode and permission mask to an access vector. */
1203 static inline u32 file_mask_to_av(int mode, int mask)
1204 {
1205         u32 av = 0;
1206
1207         if ((mode & S_IFMT) != S_IFDIR) {
1208                 if (mask & MAY_EXEC)
1209                         av |= FILE__EXECUTE;
1210                 if (mask & MAY_READ)
1211                         av |= FILE__READ;
1212
1213                 if (mask & MAY_APPEND)
1214                         av |= FILE__APPEND;
1215                 else if (mask & MAY_WRITE)
1216                         av |= FILE__WRITE;
1217
1218         } else {
1219                 if (mask & MAY_EXEC)
1220                         av |= DIR__SEARCH;
1221                 if (mask & MAY_WRITE)
1222                         av |= DIR__WRITE;
1223                 if (mask & MAY_READ)
1224                         av |= DIR__READ;
1225         }
1226
1227         return av;
1228 }
1229
1230 /* Convert a Linux file to an access vector. */
1231 static inline u32 file_to_av(struct file *file)
1232 {
1233         u32 av = 0;
1234
1235         if (file->f_mode & FMODE_READ)
1236                 av |= FILE__READ;
1237         if (file->f_mode & FMODE_WRITE) {
1238                 if (file->f_flags & O_APPEND)
1239                         av |= FILE__APPEND;
1240                 else
1241                         av |= FILE__WRITE;
1242         }
1243
1244         return av;
1245 }
1246
1247 /* Set an inode's SID to a specified value. */
1248 static int inode_security_set_sid(struct inode *inode, u32 sid)
1249 {
1250         struct inode_security_struct *isec = inode->i_security;
1251         struct superblock_security_struct *sbsec = inode->i_sb->s_security;
1252
1253         if (!sbsec->initialized) {
1254                 /* Defer initialization to selinux_complete_init. */
1255                 return 0;
1256         }
1257
1258         down(&isec->sem);
1259         isec->sclass = inode_mode_to_security_class(inode->i_mode);
1260         isec->sid = sid;
1261         isec->initialized = 1;
1262         up(&isec->sem);
1263         return 0;
1264 }
1265
1266 /* Set the security attributes on a newly created file. */
1267 static int post_create(struct inode *dir,
1268                        struct dentry *dentry)
1269 {
1270
1271         struct task_security_struct *tsec;
1272         struct inode *inode;
1273         struct inode_security_struct *dsec;
1274         struct superblock_security_struct *sbsec;
1275         u32 newsid;
1276         char *context;
1277         unsigned int len;
1278         int rc;
1279
1280         tsec = current->security;
1281         dsec = dir->i_security;
1282         sbsec = dir->i_sb->s_security;
1283
1284         inode = dentry->d_inode;
1285         if (!inode) {
1286                 /* Some file system types (e.g. NFS) may not instantiate
1287                    a dentry for all create operations (e.g. symlink),
1288                    so we have to check to see if the inode is non-NULL. */
1289                 printk(KERN_WARNING "post_create:  no inode, dir (dev=%s, "
1290                        "ino=%ld)\n", dir->i_sb->s_id, dir->i_ino);
1291                 return 0;
1292         }
1293
1294         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
1295                 newsid = tsec->create_sid;
1296         } else {
1297                 rc = security_transition_sid(tsec->sid, dsec->sid,
1298                                              inode_mode_to_security_class(inode->i_mode),
1299                                              &newsid);
1300                 if (rc) {
1301                         printk(KERN_WARNING "post_create:  "
1302                                "security_transition_sid failed, rc=%d (dev=%s "
1303                                "ino=%ld)\n",
1304                                -rc, inode->i_sb->s_id, inode->i_ino);
1305                         return rc;
1306                 }
1307         }
1308
1309         rc = inode_security_set_sid(inode, newsid);
1310         if (rc) {
1311                 printk(KERN_WARNING "post_create:  inode_security_set_sid "
1312                        "failed, rc=%d (dev=%s ino=%ld)\n",
1313                        -rc, inode->i_sb->s_id, inode->i_ino);
1314                 return rc;
1315         }
1316
1317         if (sbsec->behavior == SECURITY_FS_USE_XATTR &&
1318             inode->i_op->setxattr) {
1319                 /* Use extended attributes. */
1320                 rc = security_sid_to_context(newsid, &context, &len);
1321                 if (rc) {
1322                         printk(KERN_WARNING "post_create:  sid_to_context "
1323                                "failed, rc=%d (dev=%s ino=%ld)\n",
1324                                -rc, inode->i_sb->s_id, inode->i_ino);
1325                         return rc;
1326                 }
1327                 down(&inode->i_sem);
1328                 rc = inode->i_op->setxattr(dentry,
1329                                            XATTR_NAME_SELINUX,
1330                                            context, len, 0);
1331                 up(&inode->i_sem);
1332                 kfree(context);
1333                 if (rc < 0) {
1334                         printk(KERN_WARNING "post_create:  setxattr failed, "
1335                                "rc=%d (dev=%s ino=%ld)\n",
1336                                -rc, inode->i_sb->s_id, inode->i_ino);
1337                         return rc;
1338                 }
1339         }
1340
1341         return 0;
1342 }
1343
1344
1345 /* Hook functions begin here. */
1346
1347 static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
1348 {
1349         struct task_security_struct *psec = parent->security;
1350         struct task_security_struct *csec = child->security;
1351         int rc;
1352
1353         rc = secondary_ops->ptrace(parent,child);
1354         if (rc)
1355                 return rc;
1356
1357         rc = task_has_perm(parent, child, PROCESS__PTRACE);
1358         /* Save the SID of the tracing process for later use in apply_creds. */
1359         if (!rc)
1360                 csec->ptrace_sid = psec->sid;
1361         return rc;
1362 }
1363
1364 static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
1365                           kernel_cap_t *inheritable, kernel_cap_t *permitted)
1366 {
1367         int error;
1368
1369         error = task_has_perm(current, target, PROCESS__GETCAP);
1370         if (error)
1371                 return error;
1372
1373         return secondary_ops->capget(target, effective, inheritable, permitted);
1374 }
1375
1376 static int selinux_capset_check(struct task_struct *target, kernel_cap_t *effective,
1377                                 kernel_cap_t *inheritable, kernel_cap_t *permitted)
1378 {
1379         int error;
1380
1381         error = secondary_ops->capset_check(target, effective, inheritable, permitted);
1382         if (error)
1383                 return error;
1384
1385         return task_has_perm(current, target, PROCESS__SETCAP);
1386 }
1387
1388 static void selinux_capset_set(struct task_struct *target, kernel_cap_t *effective,
1389                                kernel_cap_t *inheritable, kernel_cap_t *permitted)
1390 {
1391         secondary_ops->capset_set(target, effective, inheritable, permitted);
1392 }
1393
1394 static int selinux_capable(struct task_struct *tsk, int cap)
1395 {
1396         int rc;
1397
1398         rc = secondary_ops->capable(tsk, cap);
1399         if (rc)
1400                 return rc;
1401
1402         return task_has_capability(tsk,cap);
1403 }
1404
1405 static int selinux_sysctl(ctl_table *table, int op)
1406 {
1407         int error = 0;
1408         u32 av;
1409         struct task_security_struct *tsec;
1410         u32 tsid;
1411         int rc;
1412
1413         rc = secondary_ops->sysctl(table, op);
1414         if (rc)
1415                 return rc;
1416
1417         tsec = current->security;
1418
1419         rc = selinux_proc_get_sid(table->de, (op == 001) ?
1420                                   SECCLASS_DIR : SECCLASS_FILE, &tsid);
1421         if (rc) {
1422                 /* Default to the well-defined sysctl SID. */
1423                 tsid = SECINITSID_SYSCTL;
1424         }
1425
1426         /* The op values are "defined" in sysctl.c, thereby creating
1427          * a bad coupling between this module and sysctl.c */
1428         if(op == 001) {
1429                 error = avc_has_perm(tsec->sid, tsid,
1430                                      SECCLASS_DIR, DIR__SEARCH, NULL);
1431         } else {
1432                 av = 0;
1433                 if (op & 004)
1434                         av |= FILE__READ;
1435                 if (op & 002)
1436                         av |= FILE__WRITE;
1437                 if (av)
1438                         error = avc_has_perm(tsec->sid, tsid,
1439                                              SECCLASS_FILE, av, NULL);
1440         }
1441
1442         return error;
1443 }
1444
1445 static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
1446 {
1447         int rc = 0;
1448
1449         if (!sb)
1450                 return 0;
1451
1452         switch (cmds) {
1453                 case Q_SYNC:
1454                 case Q_QUOTAON:
1455                 case Q_QUOTAOFF:
1456                 case Q_SETINFO:
1457                 case Q_SETQUOTA:
1458                         rc = superblock_has_perm(current,
1459                                                  sb,
1460                                                  FILESYSTEM__QUOTAMOD, NULL);
1461                         break;
1462                 case Q_GETFMT:
1463                 case Q_GETINFO:
1464                 case Q_GETQUOTA:
1465                         rc = superblock_has_perm(current,
1466                                                  sb,
1467                                                  FILESYSTEM__QUOTAGET, NULL);
1468                         break;
1469                 default:
1470                         rc = 0;  /* let the kernel handle invalid cmds */
1471                         break;
1472         }
1473         return rc;
1474 }
1475
1476 static int selinux_quota_on(struct dentry *dentry)
1477 {
1478         return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON);
1479 }
1480
1481 static int selinux_syslog(int type)
1482 {
1483         int rc;
1484
1485         rc = secondary_ops->syslog(type);
1486         if (rc)
1487                 return rc;
1488
1489         switch (type) {
1490                 case 3:         /* Read last kernel messages */
1491                 case 10:        /* Return size of the log buffer */
1492                         rc = task_has_system(current, SYSTEM__SYSLOG_READ);
1493                         break;
1494                 case 6:         /* Disable logging to console */
1495                 case 7:         /* Enable logging to console */
1496                 case 8:         /* Set level of messages printed to console */
1497                         rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
1498                         break;
1499                 case 0:         /* Close log */
1500                 case 1:         /* Open log */
1501                 case 2:         /* Read from log */
1502                 case 4:         /* Read/clear last kernel messages */
1503                 case 5:         /* Clear ring buffer */
1504                 default:
1505                         rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
1506                         break;
1507         }
1508         return rc;
1509 }
1510
1511 /*
1512  * Check that a process has enough memory to allocate a new virtual
1513  * mapping. 0 means there is enough memory for the allocation to
1514  * succeed and -ENOMEM implies there is not.
1515  *
1516  * Note that secondary_ops->capable and task_has_perm_noaudit return 0
1517  * if the capability is granted, but __vm_enough_memory requires 1 if
1518  * the capability is granted.
1519  *
1520  * Do not audit the selinux permission check, as this is applied to all
1521  * processes that allocate mappings.
1522  */
1523 static int selinux_vm_enough_memory(long pages)
1524 {
1525         int rc, cap_sys_admin = 0;
1526         struct task_security_struct *tsec = current->security;
1527
1528         rc = secondary_ops->capable(current, CAP_SYS_ADMIN);
1529         if (rc == 0)
1530                 rc = avc_has_perm_noaudit(tsec->sid, tsec->sid,
1531                                         SECCLASS_CAPABILITY,
1532                                         CAP_TO_MASK(CAP_SYS_ADMIN),
1533                                         NULL);
1534
1535         if (rc == 0)
1536                 cap_sys_admin = 1;
1537
1538         return __vm_enough_memory(pages, cap_sys_admin);
1539 }
1540
1541 /* binprm security operations */
1542
1543 static int selinux_bprm_alloc_security(struct linux_binprm *bprm)
1544 {
1545         struct bprm_security_struct *bsec;
1546
1547         bsec = kmalloc(sizeof(struct bprm_security_struct), GFP_KERNEL);
1548         if (!bsec)
1549                 return -ENOMEM;
1550
1551         memset(bsec, 0, sizeof *bsec);
1552         bsec->magic = SELINUX_MAGIC;
1553         bsec->bprm = bprm;
1554         bsec->sid = SECINITSID_UNLABELED;
1555         bsec->set = 0;
1556
1557         bprm->security = bsec;
1558         return 0;
1559 }
1560
1561 static int selinux_bprm_set_security(struct linux_binprm *bprm)
1562 {
1563         struct task_security_struct *tsec;
1564         struct inode *inode = bprm->file->f_dentry->d_inode;
1565         struct inode_security_struct *isec;
1566         struct bprm_security_struct *bsec;
1567         u32 newsid;
1568         struct avc_audit_data ad;
1569         int rc;
1570
1571         rc = secondary_ops->bprm_set_security(bprm);
1572         if (rc)
1573                 return rc;
1574
1575         bsec = bprm->security;
1576
1577         if (bsec->set)
1578                 return 0;
1579
1580         tsec = current->security;
1581         isec = inode->i_security;
1582
1583         /* Default to the current task SID. */
1584         bsec->sid = tsec->sid;
1585
1586         /* Reset create SID on execve. */
1587         tsec->create_sid = 0;
1588
1589         if (tsec->exec_sid) {
1590                 newsid = tsec->exec_sid;
1591                 /* Reset exec SID on execve. */
1592                 tsec->exec_sid = 0;
1593         } else {
1594                 /* Check for a default transition on this program. */
1595                 rc = security_transition_sid(tsec->sid, isec->sid,
1596                                              SECCLASS_PROCESS, &newsid);
1597                 if (rc)
1598                         return rc;
1599         }
1600
1601         AVC_AUDIT_DATA_INIT(&ad, FS);
1602         ad.u.fs.mnt = bprm->file->f_vfsmnt;
1603         ad.u.fs.dentry = bprm->file->f_dentry;
1604
1605         if (bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)
1606                 newsid = tsec->sid;
1607
1608         if (tsec->sid == newsid) {
1609                 rc = avc_has_perm(tsec->sid, isec->sid,
1610                                   SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
1611                 if (rc)
1612                         return rc;
1613         } else {
1614                 /* Check permissions for the transition. */
1615                 rc = avc_has_perm(tsec->sid, newsid,
1616                                   SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
1617                 if (rc)
1618                         return rc;
1619
1620                 rc = avc_has_perm(newsid, isec->sid,
1621                                   SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
1622                 if (rc)
1623                         return rc;
1624
1625                 /* Clear any possibly unsafe personality bits on exec: */
1626                 current->personality &= ~PER_CLEAR_ON_SETID;
1627
1628                 /* Set the security field to the new SID. */
1629                 bsec->sid = newsid;
1630         }
1631
1632         bsec->set = 1;
1633         return 0;
1634 }
1635
1636 static int selinux_bprm_check_security (struct linux_binprm *bprm)
1637 {
1638         return secondary_ops->bprm_check_security(bprm);
1639 }
1640
1641
1642 static int selinux_bprm_secureexec (struct linux_binprm *bprm)
1643 {
1644         struct task_security_struct *tsec = current->security;
1645         int atsecure = 0;
1646
1647         if (tsec->osid != tsec->sid) {
1648                 /* Enable secure mode for SIDs transitions unless
1649                    the noatsecure permission is granted between
1650                    the two SIDs, i.e. ahp returns 0. */
1651                 atsecure = avc_has_perm(tsec->osid, tsec->sid,
1652                                          SECCLASS_PROCESS,
1653                                          PROCESS__NOATSECURE, NULL);
1654         }
1655
1656         return (atsecure || secondary_ops->bprm_secureexec(bprm));
1657 }
1658
1659 static void selinux_bprm_free_security(struct linux_binprm *bprm)
1660 {
1661         struct bprm_security_struct *bsec = bprm->security;
1662         bprm->security = NULL;
1663         kfree(bsec);
1664 }
1665
1666 extern struct vfsmount *selinuxfs_mount;
1667 extern struct dentry *selinux_null;
1668
1669 /* Derived from fs/exec.c:flush_old_files. */
1670 static inline void flush_unauthorized_files(struct files_struct * files)
1671 {
1672         struct avc_audit_data ad;
1673         struct file *file, *devnull = NULL;
1674         struct tty_struct *tty = current->signal->tty;
1675         long j = -1;
1676
1677         if (tty) {
1678                 file_list_lock();
1679                 file = list_entry(tty->tty_files.next, typeof(*file), f_list);
1680                 if (file) {
1681                         /* Revalidate access to controlling tty.
1682                            Use inode_has_perm on the tty inode directly rather
1683                            than using file_has_perm, as this particular open
1684                            file may belong to another process and we are only
1685                            interested in the inode-based check here. */
1686                         struct inode *inode = file->f_dentry->d_inode;
1687                         if (inode_has_perm(current, inode,
1688                                            FILE__READ | FILE__WRITE, NULL)) {
1689                                 /* Reset controlling tty. */
1690                                 current->signal->tty = NULL;
1691                                 current->signal->tty_old_pgrp = 0;
1692                         }
1693                 }
1694                 file_list_unlock();
1695         }
1696
1697         /* Revalidate access to inherited open files. */
1698
1699         AVC_AUDIT_DATA_INIT(&ad,FS);
1700
1701         spin_lock(&files->file_lock);
1702         for (;;) {
1703                 unsigned long set, i;
1704                 int fd;
1705
1706                 j++;
1707                 i = j * __NFDBITS;
1708                 if (i >= files->max_fds || i >= files->max_fdset)
1709                         break;
1710                 set = files->open_fds->fds_bits[j];
1711                 if (!set)
1712                         continue;
1713                 spin_unlock(&files->file_lock);
1714                 for ( ; set ; i++,set >>= 1) {
1715                         if (set & 1) {
1716                                 file = fget(i);
1717                                 if (!file)
1718                                         continue;
1719                                 if (file_has_perm(current,
1720                                                   file,
1721                                                   file_to_av(file))) {
1722                                         sys_close(i);
1723                                         fd = get_unused_fd();
1724                                         if (fd != i) {
1725                                                 if (fd >= 0)
1726                                                         put_unused_fd(fd);
1727                                                 fput(file);
1728                                                 continue;
1729                                         }
1730                                         if (devnull) {
1731                                                 atomic_inc(&devnull->f_count);
1732                                         } else {
1733                                                 devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR);
1734                                                 if (!devnull) {
1735                                                         put_unused_fd(fd);
1736                                                         fput(file);
1737                                                         continue;
1738                                                 }
1739                                         }
1740                                         fd_install(fd, devnull);
1741                                 }
1742                                 fput(file);
1743                         }
1744                 }
1745                 spin_lock(&files->file_lock);
1746
1747         }
1748         spin_unlock(&files->file_lock);
1749 }
1750
1751 static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe)
1752 {
1753         struct task_security_struct *tsec;
1754         struct bprm_security_struct *bsec;
1755         u32 sid;
1756         int rc;
1757
1758         secondary_ops->bprm_apply_creds(bprm, unsafe);
1759
1760         tsec = current->security;
1761
1762         bsec = bprm->security;
1763         sid = bsec->sid;
1764
1765         tsec->osid = tsec->sid;
1766         bsec->unsafe = 0;
1767         if (tsec->sid != sid) {
1768                 /* Check for shared state.  If not ok, leave SID
1769                    unchanged and kill. */
1770                 if (unsafe & LSM_UNSAFE_SHARE) {
1771                         rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
1772                                         PROCESS__SHARE, NULL);
1773                         if (rc) {
1774                                 bsec->unsafe = 1;
1775                                 return;
1776                         }
1777                 }
1778
1779                 /* Check for ptracing, and update the task SID if ok.
1780                    Otherwise, leave SID unchanged and kill. */
1781                 if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
1782                         rc = avc_has_perm(tsec->ptrace_sid, sid,
1783                                           SECCLASS_PROCESS, PROCESS__PTRACE,
1784                                           NULL);
1785                         if (rc) {
1786                                 bsec->unsafe = 1;
1787                                 return;
1788                         }
1789                 }
1790                 tsec->sid = sid;
1791         }
1792 }
1793
1794 /*
1795  * called after apply_creds without the task lock held
1796  */
1797 static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm)
1798 {
1799         struct task_security_struct *tsec;
1800         struct rlimit *rlim, *initrlim;
1801         struct itimerval itimer;
1802         struct bprm_security_struct *bsec;
1803         int rc, i;
1804
1805         tsec = current->security;
1806         bsec = bprm->security;
1807
1808         if (bsec->unsafe) {
1809                 force_sig_specific(SIGKILL, current);
1810                 return;
1811         }
1812         if (tsec->osid == tsec->sid)
1813                 return;
1814
1815         /* Close files for which the new task SID is not authorized. */
1816         flush_unauthorized_files(current->files);
1817
1818         /* Check whether the new SID can inherit signal state
1819            from the old SID.  If not, clear itimers to avoid
1820            subsequent signal generation and flush and unblock
1821            signals. This must occur _after_ the task SID has
1822           been updated so that any kill done after the flush
1823           will be checked against the new SID. */
1824         rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1825                           PROCESS__SIGINH, NULL);
1826         if (rc) {
1827                 memset(&itimer, 0, sizeof itimer);
1828                 for (i = 0; i < 3; i++)
1829                         do_setitimer(i, &itimer, NULL);
1830                 flush_signals(current);
1831                 spin_lock_irq(&current->sighand->siglock);
1832                 flush_signal_handlers(current, 1);
1833                 sigemptyset(&current->blocked);
1834                 recalc_sigpending();
1835                 spin_unlock_irq(&current->sighand->siglock);
1836         }
1837
1838         /* Check whether the new SID can inherit resource limits
1839            from the old SID.  If not, reset all soft limits to
1840            the lower of the current task's hard limit and the init
1841            task's soft limit.  Note that the setting of hard limits
1842            (even to lower them) can be controlled by the setrlimit
1843            check. The inclusion of the init task's soft limit into
1844            the computation is to avoid resetting soft limits higher
1845            than the default soft limit for cases where the default
1846            is lower than the hard limit, e.g. RLIMIT_CORE or
1847            RLIMIT_STACK.*/
1848         rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS,
1849                           PROCESS__RLIMITINH, NULL);
1850         if (rc) {
1851                 for (i = 0; i < RLIM_NLIMITS; i++) {
1852                         rlim = current->signal->rlim + i;
1853                         initrlim = init_task.signal->rlim+i;
1854                         rlim->rlim_cur = min(rlim->rlim_max,initrlim->rlim_cur);
1855                 }
1856                 if (current->signal->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
1857                         /*
1858                          * This will cause RLIMIT_CPU calculations
1859                          * to be refigured.
1860                          */
1861                         current->it_prof_expires = jiffies_to_cputime(1);
1862                 }
1863         }
1864
1865         /* Wake up the parent if it is waiting so that it can
1866            recheck wait permission to the new task SID. */
1867         wake_up_interruptible(&current->parent->signal->wait_chldexit);
1868 }
1869
1870 /* superblock security operations */
1871
1872 static int selinux_sb_alloc_security(struct super_block *sb)
1873 {
1874         return superblock_alloc_security(sb);
1875 }
1876
1877 static void selinux_sb_free_security(struct super_block *sb)
1878 {
1879         superblock_free_security(sb);
1880 }
1881
1882 static inline int match_prefix(char *prefix, int plen, char *option, int olen)
1883 {
1884         if (plen > olen)
1885                 return 0;
1886
1887         return !memcmp(prefix, option, plen);
1888 }
1889
1890 static inline int selinux_option(char *option, int len)
1891 {
1892         return (match_prefix("context=", sizeof("context=")-1, option, len) ||
1893                 match_prefix("fscontext=", sizeof("fscontext=")-1, option, len) ||
1894                 match_prefix("defcontext=", sizeof("defcontext=")-1, option, len));
1895 }
1896
1897 static inline void take_option(char **to, char *from, int *first, int len)
1898 {
1899         if (!*first) {
1900                 **to = ',';
1901                 *to += 1;
1902         }
1903         else
1904                 *first = 0;
1905         memcpy(*to, from, len);
1906         *to += len;
1907 }
1908
1909 static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
1910 {
1911         int fnosec, fsec, rc = 0;
1912         char *in_save, *in_curr, *in_end;
1913         char *sec_curr, *nosec_save, *nosec;
1914
1915         in_curr = orig;
1916         sec_curr = copy;
1917
1918         /* Binary mount data: just copy */
1919         if (type->fs_flags & FS_BINARY_MOUNTDATA) {
1920                 copy_page(sec_curr, in_curr);
1921                 goto out;
1922         }
1923
1924         nosec = (char *)get_zeroed_page(GFP_KERNEL);
1925         if (!nosec) {
1926                 rc = -ENOMEM;
1927                 goto out;
1928         }
1929
1930         nosec_save = nosec;
1931         fnosec = fsec = 1;
1932         in_save = in_end = orig;
1933
1934         do {
1935                 if (*in_end == ',' || *in_end == '\0') {
1936                         int len = in_end - in_curr;
1937
1938                         if (selinux_option(in_curr, len))
1939                                 take_option(&sec_curr, in_curr, &fsec, len);
1940                         else
1941                                 take_option(&nosec, in_curr, &fnosec, len);
1942
1943                         in_curr = in_end + 1;
1944                 }
1945         } while (*in_end++);
1946
1947         copy_page(in_save, nosec_save);
1948 out:
1949         return rc;
1950 }
1951
1952 static int selinux_sb_kern_mount(struct super_block *sb, void *data)
1953 {
1954         struct avc_audit_data ad;
1955         int rc;
1956
1957         rc = superblock_doinit(sb, data);
1958         if (rc)
1959                 return rc;
1960
1961         AVC_AUDIT_DATA_INIT(&ad,FS);
1962         ad.u.fs.dentry = sb->s_root;
1963         return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad);
1964 }
1965
1966 static int selinux_sb_statfs(struct super_block *sb)
1967 {
1968         struct avc_audit_data ad;
1969
1970         AVC_AUDIT_DATA_INIT(&ad,FS);
1971         ad.u.fs.dentry = sb->s_root;
1972         return superblock_has_perm(current, sb, FILESYSTEM__GETATTR, &ad);
1973 }
1974
1975 static int selinux_mount(char * dev_name,
1976                          struct nameidata *nd,
1977                          char * type,
1978                          unsigned long flags,
1979                          void * data)
1980 {
1981         int rc;
1982
1983         rc = secondary_ops->sb_mount(dev_name, nd, type, flags, data);
1984         if (rc)
1985                 return rc;
1986
1987         if (flags & MS_REMOUNT)
1988                 return superblock_has_perm(current, nd->mnt->mnt_sb,
1989                                            FILESYSTEM__REMOUNT, NULL);
1990         else
1991                 return dentry_has_perm(current, nd->mnt, nd->dentry,
1992                                        FILE__MOUNTON);
1993 }
1994
1995 static int selinux_umount(struct vfsmount *mnt, int flags)
1996 {
1997         int rc;
1998
1999         rc = secondary_ops->sb_umount(mnt, flags);
2000         if (rc)
2001                 return rc;
2002
2003         return superblock_has_perm(current,mnt->mnt_sb,
2004                                    FILESYSTEM__UNMOUNT,NULL);
2005 }
2006
2007 /* inode security operations */
2008
2009 static int selinux_inode_alloc_security(struct inode *inode)
2010 {
2011         return inode_alloc_security(inode);
2012 }
2013
2014 static void selinux_inode_free_security(struct inode *inode)
2015 {
2016         inode_free_security(inode);
2017 }
2018
2019 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2020 {
2021         return may_create(dir, dentry, SECCLASS_FILE);
2022 }
2023
2024 static void selinux_inode_post_create(struct inode *dir, struct dentry *dentry, int mask)
2025 {
2026         post_create(dir, dentry);
2027 }
2028
2029 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2030 {
2031         int rc;
2032
2033         rc = secondary_ops->inode_link(old_dentry,dir,new_dentry);
2034         if (rc)
2035                 return rc;
2036         return may_link(dir, old_dentry, MAY_LINK);
2037 }
2038
2039 static void selinux_inode_post_link(struct dentry *old_dentry, struct inode *inode, struct dentry *new_dentry)
2040 {
2041         return;
2042 }
2043
2044 static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2045 {
2046         int rc;
2047
2048         rc = secondary_ops->inode_unlink(dir, dentry);
2049         if (rc)
2050                 return rc;
2051         return may_link(dir, dentry, MAY_UNLINK);
2052 }
2053
2054 static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2055 {
2056         return may_create(dir, dentry, SECCLASS_LNK_FILE);
2057 }
2058
2059 static void selinux_inode_post_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2060 {
2061         post_create(dir, dentry);
2062 }
2063
2064 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2065 {
2066         return may_create(dir, dentry, SECCLASS_DIR);
2067 }
2068
2069 static void selinux_inode_post_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2070 {
2071         post_create(dir, dentry);
2072 }
2073
2074 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2075 {
2076         return may_link(dir, dentry, MAY_RMDIR);
2077 }
2078
2079 static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2080 {
2081         int rc;
2082
2083         rc = secondary_ops->inode_mknod(dir, dentry, mode, dev);
2084         if (rc)
2085                 return rc;
2086
2087         return may_create(dir, dentry, inode_mode_to_security_class(mode));
2088 }
2089
2090 static void selinux_inode_post_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2091 {
2092         post_create(dir, dentry);
2093 }
2094
2095 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
2096                                 struct inode *new_inode, struct dentry *new_dentry)
2097 {
2098         return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2099 }
2100
2101 static void selinux_inode_post_rename(struct inode *old_inode, struct dentry *old_dentry,
2102                                       struct inode *new_inode, struct dentry *new_dentry)
2103 {
2104         return;
2105 }
2106
2107 static int selinux_inode_readlink(struct dentry *dentry)
2108 {
2109         return dentry_has_perm(current, NULL, dentry, FILE__READ);
2110 }
2111
2112 static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2113 {
2114         int rc;
2115
2116         rc = secondary_ops->inode_follow_link(dentry,nameidata);
2117         if (rc)
2118                 return rc;
2119         return dentry_has_perm(current, NULL, dentry, FILE__READ);
2120 }
2121
2122 static int selinux_inode_permission(struct inode *inode, int mask,
2123                                     struct nameidata *nd)
2124 {
2125         int rc;
2126
2127         rc = secondary_ops->inode_permission(inode, mask, nd);
2128         if (rc)
2129                 return rc;
2130
2131         if (!mask) {
2132                 /* No permission to check.  Existence test. */
2133                 return 0;
2134         }
2135
2136         return inode_has_perm(current, inode,
2137                                file_mask_to_av(inode->i_mode, mask), NULL);
2138 }
2139
2140 static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2141 {
2142         int rc;
2143
2144         rc = secondary_ops->inode_setattr(dentry, iattr);
2145         if (rc)
2146                 return rc;
2147
2148         if (iattr->ia_valid & ATTR_FORCE)
2149                 return 0;
2150
2151         if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2152                                ATTR_ATIME_SET | ATTR_MTIME_SET))
2153                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2154
2155         return dentry_has_perm(current, NULL, dentry, FILE__WRITE);
2156 }
2157
2158 static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2159 {
2160         return dentry_has_perm(current, mnt, dentry, FILE__GETATTR);
2161 }
2162
2163 static int selinux_inode_setxattr(struct dentry *dentry, char *name, void *value, size_t size, int flags)
2164 {
2165         struct task_security_struct *tsec = current->security;
2166         struct inode *inode = dentry->d_inode;
2167         struct inode_security_struct *isec = inode->i_security;
2168         struct superblock_security_struct *sbsec;
2169         struct avc_audit_data ad;
2170         u32 newsid;
2171         int rc = 0;
2172
2173         if (strcmp(name, XATTR_NAME_SELINUX)) {
2174                 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2175                              sizeof XATTR_SECURITY_PREFIX - 1) &&
2176                     !capable(CAP_SYS_ADMIN)) {
2177                         /* A different attribute in the security namespace.
2178                            Restrict to administrator. */
2179                         return -EPERM;
2180                 }
2181
2182                 /* Not an attribute we recognize, so just check the
2183                    ordinary setattr permission. */
2184                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2185         }
2186
2187         sbsec = inode->i_sb->s_security;
2188         if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2189                 return -EOPNOTSUPP;
2190
2191         if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
2192                 return -EPERM;
2193
2194         AVC_AUDIT_DATA_INIT(&ad,FS);
2195         ad.u.fs.dentry = dentry;
2196
2197         rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass,
2198                           FILE__RELABELFROM, &ad);
2199         if (rc)
2200                 return rc;
2201
2202         rc = security_context_to_sid(value, size, &newsid);
2203         if (rc)
2204                 return rc;
2205
2206         rc = avc_has_perm(tsec->sid, newsid, isec->sclass,
2207                           FILE__RELABELTO, &ad);
2208         if (rc)
2209                 return rc;
2210
2211         rc = security_validate_transition(isec->sid, newsid, tsec->sid,
2212                                           isec->sclass);
2213         if (rc)
2214                 return rc;
2215
2216         return avc_has_perm(newsid,
2217                             sbsec->sid,
2218                             SECCLASS_FILESYSTEM,
2219                             FILESYSTEM__ASSOCIATE,
2220                             &ad);
2221 }
2222
2223 static void selinux_inode_post_setxattr(struct dentry *dentry, char *name,
2224                                         void *value, size_t size, int flags)
2225 {
2226         struct inode *inode = dentry->d_inode;
2227         struct inode_security_struct *isec = inode->i_security;
2228         u32 newsid;
2229         int rc;
2230
2231         if (strcmp(name, XATTR_NAME_SELINUX)) {
2232                 /* Not an attribute we recognize, so nothing to do. */
2233                 return;
2234         }
2235
2236         rc = security_context_to_sid(value, size, &newsid);
2237         if (rc) {
2238                 printk(KERN_WARNING "%s:  unable to obtain SID for context "
2239                        "%s, rc=%d\n", __FUNCTION__, (char*)value, -rc);
2240                 return;
2241         }
2242
2243         isec->sid = newsid;
2244         return;
2245 }
2246
2247 static int selinux_inode_getxattr (struct dentry *dentry, char *name)
2248 {
2249         struct inode *inode = dentry->d_inode;
2250         struct superblock_security_struct *sbsec = inode->i_sb->s_security;
2251
2252         if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
2253                 return -EOPNOTSUPP;
2254
2255         return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2256 }
2257
2258 static int selinux_inode_listxattr (struct dentry *dentry)
2259 {
2260         return dentry_has_perm(current, NULL, dentry, FILE__GETATTR);
2261 }
2262
2263 static int selinux_inode_removexattr (struct dentry *dentry, char *name)
2264 {
2265         if (strcmp(name, XATTR_NAME_SELINUX)) {
2266                 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2267                              sizeof XATTR_SECURITY_PREFIX - 1) &&
2268                     !capable(CAP_SYS_ADMIN)) {
2269                         /* A different attribute in the security namespace.
2270                            Restrict to administrator. */
2271                         return -EPERM;
2272                 }
2273
2274                 /* Not an attribute we recognize, so just check the
2275                    ordinary setattr permission. Might want a separate
2276                    permission for removexattr. */
2277                 return dentry_has_perm(current, NULL, dentry, FILE__SETATTR);
2278         }
2279
2280         /* No one is allowed to remove a SELinux security label.
2281            You can change the label, but all data must be labeled. */
2282         return -EACCES;
2283 }
2284
2285 static int selinux_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size)
2286 {
2287         struct inode_security_struct *isec = inode->i_security;
2288         char *context;
2289         unsigned len;
2290         int rc;
2291
2292         /* Permission check handled by selinux_inode_getxattr hook.*/
2293
2294         if (strcmp(name, XATTR_SELINUX_SUFFIX))
2295                 return -EOPNOTSUPP;
2296
2297         rc = security_sid_to_context(isec->sid, &context, &len);
2298         if (rc)
2299                 return rc;
2300
2301         if (!buffer || !size) {
2302                 kfree(context);
2303                 return len;
2304         }
2305         if (size < len) {
2306                 kfree(context);
2307                 return -ERANGE;
2308         }
2309         memcpy(buffer, context, len);
2310         kfree(context);
2311         return len;
2312 }
2313
2314 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
2315                                      const void *value, size_t size, int flags)
2316 {
2317         struct inode_security_struct *isec = inode->i_security;
2318         u32 newsid;
2319         int rc;
2320
2321         if (strcmp(name, XATTR_SELINUX_SUFFIX))
2322                 return -EOPNOTSUPP;
2323
2324         if (!value || !size)
2325                 return -EACCES;
2326
2327         rc = security_context_to_sid((void*)value, size, &newsid);
2328         if (rc)
2329                 return rc;
2330
2331         isec->sid = newsid;
2332         return 0;
2333 }
2334
2335 static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2336 {
2337         const int len = sizeof(XATTR_NAME_SELINUX);
2338         if (buffer && len <= buffer_size)
2339                 memcpy(buffer, XATTR_NAME_SELINUX, len);
2340         return len;
2341 }
2342
2343 /* file security operations */
2344
2345 static int selinux_file_permission(struct file *file, int mask)
2346 {
2347         struct inode *inode = file->f_dentry->d_inode;
2348
2349         if (!mask) {
2350                 /* No permission to check.  Existence test. */
2351                 return 0;
2352         }
2353
2354         /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2355         if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2356                 mask |= MAY_APPEND;
2357
2358         return file_has_perm(current, file,
2359                              file_mask_to_av(inode->i_mode, mask));
2360 }
2361
2362 static int selinux_file_alloc_security(struct file *file)
2363 {
2364         return file_alloc_security(file);
2365 }
2366
2367 static void selinux_file_free_security(struct file *file)
2368 {
2369         file_free_security(file);
2370 }
2371
2372 static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2373                               unsigned long arg)
2374 {
2375         int error = 0;
2376
2377         switch (cmd) {
2378                 case FIONREAD:
2379                 /* fall through */
2380                 case FIBMAP:
2381                 /* fall through */
2382                 case FIGETBSZ:
2383                 /* fall through */
2384                 case EXT2_IOC_GETFLAGS:
2385                 /* fall through */
2386                 case EXT2_IOC_GETVERSION:
2387                         error = file_has_perm(current, file, FILE__GETATTR);
2388                         break;
2389
2390                 case EXT2_IOC_SETFLAGS:
2391                 /* fall through */
2392                 case EXT2_IOC_SETVERSION:
2393                         error = file_has_perm(current, file, FILE__SETATTR);
2394                         break;
2395
2396                 /* sys_ioctl() checks */
2397                 case FIONBIO:
2398                 /* fall through */
2399                 case FIOASYNC:
2400                         error = file_has_perm(current, file, 0);
2401                         break;
2402
2403                 case KDSKBENT:
2404                 case KDSKBSENT:
2405                         error = task_has_capability(current,CAP_SYS_TTY_CONFIG);
2406                         break;
2407
2408                 /* default case assumes that the command will go
2409                  * to the file's ioctl() function.
2410                  */
2411                 default:
2412                         error = file_has_perm(current, file, FILE__IOCTL);
2413
2414         }
2415         return error;
2416 }
2417
2418 static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2419 {
2420 #ifndef CONFIG_PPC32
2421         if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
2422                 /*
2423                  * We are making executable an anonymous mapping or a
2424                  * private file mapping that will also be writable.
2425                  * This has an additional check.
2426                  */
2427                 int rc = task_has_perm(current, current, PROCESS__EXECMEM);
2428                 if (rc)
2429                         return rc;
2430         }
2431 #endif
2432
2433         if (file) {
2434                 /* read access is always possible with a mapping */
2435                 u32 av = FILE__READ;
2436
2437                 /* write access only matters if the mapping is shared */
2438                 if (shared && (prot & PROT_WRITE))
2439                         av |= FILE__WRITE;
2440
2441                 if (prot & PROT_EXEC)
2442                         av |= FILE__EXECUTE;
2443
2444                 return file_has_perm(current, file, av);
2445         }
2446         return 0;
2447 }
2448
2449 static int selinux_file_mmap(struct file *file, unsigned long reqprot,
2450                              unsigned long prot, unsigned long flags)
2451 {
2452         int rc;
2453
2454         rc = secondary_ops->file_mmap(file, reqprot, prot, flags);
2455         if (rc)
2456                 return rc;
2457
2458         if (selinux_checkreqprot)
2459                 prot = reqprot;
2460
2461         return file_map_prot_check(file, prot,
2462                                    (flags & MAP_TYPE) == MAP_SHARED);
2463 }
2464
2465 static int selinux_file_mprotect(struct vm_area_struct *vma,
2466                                  unsigned long reqprot,
2467                                  unsigned long prot)
2468 {
2469         int rc;
2470
2471         rc = secondary_ops->file_mprotect(vma, reqprot, prot);
2472         if (rc)
2473                 return rc;
2474
2475         if (selinux_checkreqprot)
2476                 prot = reqprot;
2477
2478 #ifndef CONFIG_PPC32
2479         if (vma->vm_file != NULL && vma->anon_vma != NULL && (prot & PROT_EXEC)) {
2480                 /*
2481                  * We are making executable a file mapping that has
2482                  * had some COW done. Since pages might have been written,
2483                  * check ability to execute the possibly modified content.
2484                  * This typically should only occur for text relocations.
2485                  */
2486                 int rc = file_has_perm(current, vma->vm_file, FILE__EXECMOD);
2487                 if (rc)
2488                         return rc;
2489         }
2490 #endif
2491
2492         return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
2493 }
2494
2495 static int selinux_file_lock(struct file *file, unsigned int cmd)
2496 {
2497         return file_has_perm(current, file, FILE__LOCK);
2498 }
2499
2500 static int selinux_file_fcntl(struct file *file, unsigned int cmd,
2501                               unsigned long arg)
2502 {
2503         int err = 0;
2504
2505         switch (cmd) {
2506                 case F_SETFL:
2507                         if (!file->f_dentry || !file->f_dentry->d_inode) {
2508                                 err = -EINVAL;
2509                                 break;
2510                         }
2511
2512                         if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
2513                                 err = file_has_perm(current, file,FILE__WRITE);
2514                                 break;
2515                         }
2516                         /* fall through */
2517                 case F_SETOWN:
2518                 case F_SETSIG:
2519                 case F_GETFL:
2520                 case F_GETOWN:
2521                 case F_GETSIG:
2522                         /* Just check FD__USE permission */
2523                         err = file_has_perm(current, file, 0);
2524                         break;
2525                 case F_GETLK:
2526                 case F_SETLK:
2527                 case F_SETLKW:
2528 #if BITS_PER_LONG == 32
2529                 case F_GETLK64:
2530                 case F_SETLK64:
2531                 case F_SETLKW64:
2532 #endif
2533                         if (!file->f_dentry || !file->f_dentry->d_inode) {
2534                                 err = -EINVAL;
2535                                 break;
2536                         }
2537                         err = file_has_perm(current, file, FILE__LOCK);
2538                         break;
2539         }
2540
2541         return err;
2542 }
2543
2544 static int selinux_file_set_fowner(struct file *file)
2545 {
2546         struct task_security_struct *tsec;
2547         struct file_security_struct *fsec;
2548
2549         tsec = current->security;
2550         fsec = file->f_security;
2551         fsec->fown_sid = tsec->sid;
2552
2553         return 0;
2554 }
2555
2556 static int selinux_file_send_sigiotask(struct task_struct *tsk,
2557                                        struct fown_struct *fown, int signum)
2558 {
2559         struct file *file;
2560         u32 perm;
2561         struct task_security_struct *tsec;
2562         struct file_security_struct *fsec;
2563
2564         /* struct fown_struct is never outside the context of a struct file */
2565         file = (struct file *)((long)fown - offsetof(struct file,f_owner));
2566
2567         tsec = tsk->security;
2568         fsec = file->f_security;
2569
2570         if (!signum)
2571                 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
2572         else
2573                 perm = signal_to_av(signum);
2574
2575         return avc_has_perm(fsec->fown_sid, tsec->sid,
2576                             SECCLASS_PROCESS, perm, NULL);
2577 }
2578
2579 static int selinux_file_receive(struct file *file)
2580 {
2581         return file_has_perm(current, file, file_to_av(file));
2582 }
2583
2584 /* task security operations */
2585
2586 static int selinux_task_create(unsigned long clone_flags)
2587 {
2588         int rc;
2589
2590         rc = secondary_ops->task_create(clone_flags);
2591         if (rc)
2592                 return rc;
2593
2594         return task_has_perm(current, current, PROCESS__FORK);
2595 }
2596
2597 static int selinux_task_alloc_security(struct task_struct *tsk)
2598 {
2599         struct task_security_struct *tsec1, *tsec2;
2600         int rc;
2601
2602         tsec1 = current->security;
2603
2604         rc = task_alloc_security(tsk);
2605         if (rc)
2606                 return rc;
2607         tsec2 = tsk->security;
2608
2609         tsec2->osid = tsec1->osid;
2610         tsec2->sid = tsec1->sid;
2611
2612         /* Retain the exec and create SIDs across fork */
2613         tsec2->exec_sid = tsec1->exec_sid;
2614         tsec2->create_sid = tsec1->create_sid;
2615
2616         /* Retain ptracer SID across fork, if any.
2617            This will be reset by the ptrace hook upon any
2618            subsequent ptrace_attach operations. */
2619         tsec2->ptrace_sid = tsec1->ptrace_sid;
2620
2621         return 0;
2622 }
2623
2624 static void selinux_task_free_security(struct task_struct *tsk)
2625 {
2626         task_free_security(tsk);
2627 }
2628
2629 static int selinux_task_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2630 {
2631         /* Since setuid only affects the current process, and
2632            since the SELinux controls are not based on the Linux
2633            identity attributes, SELinux does not need to control
2634            this operation.  However, SELinux does control the use
2635            of the CAP_SETUID and CAP_SETGID capabilities using the
2636            capable hook. */
2637         return 0;
2638 }
2639
2640 static int selinux_task_post_setuid(uid_t id0, uid_t id1, uid_t id2, int flags)
2641 {
2642         return secondary_ops->task_post_setuid(id0,id1,id2,flags);
2643 }
2644
2645 static int selinux_task_setgid(gid_t id0, gid_t id1, gid_t id2, int flags)
2646 {
2647         /* See the comment for setuid above. */
2648         return 0;
2649 }
2650
2651 static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
2652 {
2653         return task_has_perm(current, p, PROCESS__SETPGID);
2654 }
2655
2656 static int selinux_task_getpgid(struct task_struct *p)
2657 {
2658         return task_has_perm(current, p, PROCESS__GETPGID);
2659 }
2660
2661 static int selinux_task_getsid(struct task_struct *p)
2662 {
2663         return task_has_perm(current, p, PROCESS__GETSESSION);
2664 }
2665
2666 static int selinux_task_setgroups(struct group_info *group_info)
2667 {
2668         /* See the comment for setuid above. */
2669         return 0;
2670 }
2671
2672 static int selinux_task_setnice(struct task_struct *p, int nice)
2673 {
2674         int rc;
2675
2676         rc = secondary_ops->task_setnice(p, nice);
2677         if (rc)
2678                 return rc;
2679
2680         return task_has_perm(current,p, PROCESS__SETSCHED);
2681 }
2682
2683 static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
2684 {
2685         struct rlimit *old_rlim = current->signal->rlim + resource;
2686         int rc;
2687
2688         rc = secondary_ops->task_setrlimit(resource, new_rlim);
2689         if (rc)
2690                 return rc;
2691
2692         /* Control the ability to change the hard limit (whether
2693            lowering or raising it), so that the hard limit can
2694            later be used as a safe reset point for the soft limit
2695            upon context transitions. See selinux_bprm_apply_creds. */
2696         if (old_rlim->rlim_max != new_rlim->rlim_max)
2697                 return task_has_perm(current, current, PROCESS__SETRLIMIT);
2698
2699         return 0;
2700 }
2701
2702 static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
2703 {
2704         return task_has_perm(current, p, PROCESS__SETSCHED);
2705 }
2706
2707 static int selinux_task_getscheduler(struct task_struct *p)
2708 {
2709         return task_has_perm(current, p, PROCESS__GETSCHED);
2710 }
2711
2712 static int selinux_task_kill(struct task_struct *p, struct siginfo *info, int sig)
2713 {
2714         u32 perm;
2715         int rc;
2716
2717         rc = secondary_ops->task_kill(p, info, sig);
2718         if (rc)
2719                 return rc;
2720
2721         if (info && ((unsigned long)info == 1 ||
2722                      (unsigned long)info == 2 || SI_FROMKERNEL(info)))
2723                 return 0;
2724
2725         if (!sig)
2726                 perm = PROCESS__SIGNULL; /* null signal; existence test */
2727         else
2728                 perm = signal_to_av(sig);
2729
2730         return task_has_perm(current, p, perm);
2731 }
2732
2733 static int selinux_task_prctl(int option,
2734                               unsigned long arg2,
2735                               unsigned long arg3,
2736                               unsigned long arg4,
2737                               unsigned long arg5)
2738 {
2739         /* The current prctl operations do not appear to require
2740            any SELinux controls since they merely observe or modify
2741            the state of the current process. */
2742         return 0;
2743 }
2744
2745 static int selinux_task_wait(struct task_struct *p)
2746 {
2747         u32 perm;
2748
2749         perm = signal_to_av(p->exit_signal);
2750
2751         return task_has_perm(p, current, perm);
2752 }
2753
2754 static void selinux_task_reparent_to_init(struct task_struct *p)
2755 {
2756         struct task_security_struct *tsec;
2757
2758         secondary_ops->task_reparent_to_init(p);
2759
2760         tsec = p->security;
2761         tsec->osid = tsec->sid;
2762         tsec->sid = SECINITSID_KERNEL;
2763         return;
2764 }
2765
2766 static void selinux_task_to_inode(struct task_struct *p,
2767                                   struct inode *inode)
2768 {
2769         struct task_security_struct *tsec = p->security;
2770         struct inode_security_struct *isec = inode->i_security;
2771
2772         isec->sid = tsec->sid;
2773         isec->initialized = 1;
2774         return;
2775 }
2776
2777 #ifdef CONFIG_SECURITY_NETWORK
2778
2779 /* Returns error only if unable to parse addresses */
2780 static int selinux_parse_skb_ipv4(struct sk_buff *skb, struct avc_audit_data *ad)
2781 {
2782         int offset, ihlen, ret = -EINVAL;
2783         struct iphdr _iph, *ih;
2784
2785         offset = skb->nh.raw - skb->data;
2786         ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
2787         if (ih == NULL)
2788                 goto out;
2789
2790         ihlen = ih->ihl * 4;
2791         if (ihlen < sizeof(_iph))
2792                 goto out;
2793
2794         ad->u.net.v4info.saddr = ih->saddr;
2795         ad->u.net.v4info.daddr = ih->daddr;
2796         ret = 0;
2797
2798         switch (ih->protocol) {
2799         case IPPROTO_TCP: {
2800                 struct tcphdr _tcph, *th;
2801
2802                 if (ntohs(ih->frag_off) & IP_OFFSET)
2803                         break;
2804
2805                 offset += ihlen;
2806                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2807                 if (th == NULL)
2808                         break;
2809
2810                 ad->u.net.sport = th->source;
2811                 ad->u.net.dport = th->dest;
2812                 break;
2813         }
2814
2815         case IPPROTO_UDP: {
2816                 struct udphdr _udph, *uh;
2817
2818                 if (ntohs(ih->frag_off) & IP_OFFSET)
2819                         break;
2820
2821                 offset += ihlen;
2822                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2823                 if (uh == NULL)
2824                         break;
2825
2826                 ad->u.net.sport = uh->source;
2827                 ad->u.net.dport = uh->dest;
2828                 break;
2829         }
2830
2831         default:
2832                 break;
2833         }
2834 out:
2835         return ret;
2836 }
2837
2838 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2839
2840 /* Returns error only if unable to parse addresses */
2841 static int selinux_parse_skb_ipv6(struct sk_buff *skb, struct avc_audit_data *ad)
2842 {
2843         u8 nexthdr;
2844         int ret = -EINVAL, offset;
2845         struct ipv6hdr _ipv6h, *ip6;
2846
2847         offset = skb->nh.raw - skb->data;
2848         ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
2849         if (ip6 == NULL)
2850                 goto out;
2851
2852         ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
2853         ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
2854         ret = 0;
2855
2856         nexthdr = ip6->nexthdr;
2857         offset += sizeof(_ipv6h);
2858         offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
2859         if (offset < 0)
2860                 goto out;
2861
2862         switch (nexthdr) {
2863         case IPPROTO_TCP: {
2864                 struct tcphdr _tcph, *th;
2865
2866                 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
2867                 if (th == NULL)
2868                         break;
2869
2870                 ad->u.net.sport = th->source;
2871                 ad->u.net.dport = th->dest;
2872                 break;
2873         }
2874
2875         case IPPROTO_UDP: {
2876                 struct udphdr _udph, *uh;
2877
2878                 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
2879                 if (uh == NULL)
2880                         break;
2881
2882                 ad->u.net.sport = uh->source;
2883                 ad->u.net.dport = uh->dest;
2884                 break;
2885         }
2886
2887         /* includes fragments */
2888         default:
2889                 break;
2890         }
2891 out:
2892         return ret;
2893 }
2894
2895 #endif /* IPV6 */
2896
2897 static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
2898                              char **addrp, int *len, int src)
2899 {
2900         int ret = 0;
2901
2902         switch (ad->u.net.family) {
2903         case PF_INET:
2904                 ret = selinux_parse_skb_ipv4(skb, ad);
2905                 if (ret || !addrp)
2906                         break;
2907                 *len = 4;
2908                 *addrp = (char *)(src ? &ad->u.net.v4info.saddr :
2909                                         &ad->u.net.v4info.daddr);
2910                 break;
2911
2912 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2913         case PF_INET6:
2914                 ret = selinux_parse_skb_ipv6(skb, ad);
2915                 if (ret || !addrp)
2916                         break;
2917                 *len = 16;
2918                 *addrp = (char *)(src ? &ad->u.net.v6info.saddr :
2919                                         &ad->u.net.v6info.daddr);
2920                 break;
2921 #endif  /* IPV6 */
2922         default:
2923                 break;
2924         }
2925
2926         return ret;
2927 }
2928
2929 /* socket security operations */
2930 static int socket_has_perm(struct task_struct *task, struct socket *sock,
2931                            u32 perms)
2932 {
2933         struct inode_security_struct *isec;
2934         struct task_security_struct *tsec;
2935         struct avc_audit_data ad;
2936         int err = 0;
2937
2938         tsec = task->security;
2939         isec = SOCK_INODE(sock)->i_security;
2940
2941         if (isec->sid == SECINITSID_KERNEL)
2942                 goto out;
2943
2944         AVC_AUDIT_DATA_INIT(&ad,NET);
2945         ad.u.net.sk = sock->sk;
2946         err = avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
2947
2948 out:
2949         return err;
2950 }
2951
2952 static int selinux_socket_create(int family, int type,
2953                                  int protocol, int kern)
2954 {
2955         int err = 0;
2956         struct task_security_struct *tsec;
2957
2958         if (kern)
2959                 goto out;
2960
2961         tsec = current->security;
2962         err = avc_has_perm(tsec->sid, tsec->sid,
2963                            socket_type_to_security_class(family, type,
2964                            protocol), SOCKET__CREATE, NULL);
2965
2966 out:
2967         return err;
2968 }
2969
2970 static void selinux_socket_post_create(struct socket *sock, int family,
2971                                        int type, int protocol, int kern)
2972 {
2973         struct inode_security_struct *isec;
2974         struct task_security_struct *tsec;
2975
2976         isec = SOCK_INODE(sock)->i_security;
2977
2978         tsec = current->security;
2979         isec->sclass = socket_type_to_security_class(family, type, protocol);
2980         isec->sid = kern ? SECINITSID_KERNEL : tsec->sid;
2981         isec->initialized = 1;
2982
2983         return;
2984 }
2985
2986 /* Range of port numbers used to automatically bind.
2987    Need to determine whether we should perform a name_bind
2988    permission check between the socket and the port number. */
2989 #define ip_local_port_range_0 sysctl_local_port_range[0]
2990 #define ip_local_port_range_1 sysctl_local_port_range[1]
2991
2992 static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
2993 {
2994         u16 family;
2995         int err;
2996
2997         err = socket_has_perm(current, sock, SOCKET__BIND);
2998         if (err)
2999                 goto out;
3000
3001         /*
3002          * If PF_INET or PF_INET6, check name_bind permission for the port.
3003          */
3004         family = sock->sk->sk_family;
3005         if (family == PF_INET || family == PF_INET6) {
3006                 char *addrp;
3007                 struct inode_security_struct *isec;
3008                 struct task_security_struct *tsec;
3009                 struct avc_audit_data ad;
3010                 struct sockaddr_in *addr4 = NULL;
3011                 struct sockaddr_in6 *addr6 = NULL;
3012                 unsigned short snum;
3013                 struct sock *sk = sock->sk;
3014                 u32 sid, node_perm, addrlen;
3015
3016                 tsec = current->security;
3017                 isec = SOCK_INODE(sock)->i_security;
3018
3019                 if (family == PF_INET) {
3020                         addr4 = (struct sockaddr_in *)address;
3021                         snum = ntohs(addr4->sin_port);
3022                         addrlen = sizeof(addr4->sin_addr.s_addr);
3023                         addrp = (char *)&addr4->sin_addr.s_addr;
3024                 } else {
3025                         addr6 = (struct sockaddr_in6 *)address;
3026                         snum = ntohs(addr6->sin6_port);
3027                         addrlen = sizeof(addr6->sin6_addr.s6_addr);
3028                         addrp = (char *)&addr6->sin6_addr.s6_addr;
3029                 }
3030
3031                 if (snum&&(snum < max(PROT_SOCK,ip_local_port_range_0) ||
3032                            snum > ip_local_port_range_1)) {
3033                         err = security_port_sid(sk->sk_family, sk->sk_type,
3034                                                 sk->sk_protocol, snum, &sid);
3035                         if (err)
3036                                 goto out;
3037                         AVC_AUDIT_DATA_INIT(&ad,NET);
3038                         ad.u.net.sport = htons(snum);
3039                         ad.u.net.family = family;
3040                         err = avc_has_perm(isec->sid, sid,
3041                                            isec->sclass,
3042                                            SOCKET__NAME_BIND, &ad);
3043                         if (err)
3044                                 goto out;
3045                 }
3046
3047                 switch(sk->sk_protocol) {
3048                 case IPPROTO_TCP:
3049                         node_perm = TCP_SOCKET__NODE_BIND;
3050                         break;
3051
3052                 case IPPROTO_UDP:
3053                         node_perm = UDP_SOCKET__NODE_BIND;
3054                         break;
3055
3056                 default:
3057                         node_perm = RAWIP_SOCKET__NODE_BIND;
3058                         break;
3059                 }
3060
3061                 err = security_node_sid(family, addrp, addrlen, &sid);
3062                 if (err)
3063                         goto out;
3064
3065                 AVC_AUDIT_DATA_INIT(&ad,NET);
3066                 ad.u.net.sport = htons(snum);
3067                 ad.u.net.family = family;
3068
3069                 if (family == PF_INET)
3070                         ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3071                 else
3072                         ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3073
3074                 err = avc_has_perm(isec->sid, sid,
3075                                    isec->sclass, node_perm, &ad);
3076                 if (err)
3077                         goto out;
3078         }
3079 out:
3080         return err;
3081 }
3082
3083 static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3084 {
3085         struct inode_security_struct *isec;
3086         int err;
3087
3088         err = socket_has_perm(current, sock, SOCKET__CONNECT);
3089         if (err)
3090                 return err;
3091
3092         /*
3093          * If a TCP socket, check name_connect permission for the port.
3094          */
3095         isec = SOCK_INODE(sock)->i_security;
3096         if (isec->sclass == SECCLASS_TCP_SOCKET) {
3097                 struct sock *sk = sock->sk;
3098                 struct avc_audit_data ad;
3099                 struct sockaddr_in *addr4 = NULL;
3100                 struct sockaddr_in6 *addr6 = NULL;
3101                 unsigned short snum;
3102                 u32 sid;
3103
3104                 if (sk->sk_family == PF_INET) {
3105                         addr4 = (struct sockaddr_in *)address;
3106                         if (addrlen != sizeof(struct sockaddr_in))
3107                                 return -EINVAL;
3108                         snum = ntohs(addr4->sin_port);
3109                 } else {
3110                         addr6 = (struct sockaddr_in6 *)address;
3111                         if (addrlen != sizeof(struct sockaddr_in6))
3112                                 return -EINVAL;
3113                         snum = ntohs(addr6->sin6_port);
3114                 }
3115
3116                 err = security_port_sid(sk->sk_family, sk->sk_type,
3117                                         sk->sk_protocol, snum, &sid);
3118                 if (err)
3119                         goto out;
3120
3121                 AVC_AUDIT_DATA_INIT(&ad,NET);
3122                 ad.u.net.dport = htons(snum);
3123                 ad.u.net.family = sk->sk_family;
3124                 err = avc_has_perm(isec->sid, sid, isec->sclass,
3125                                    TCP_SOCKET__NAME_CONNECT, &ad);
3126                 if (err)
3127                         goto out;
3128         }
3129
3130 out:
3131         return err;
3132 }
3133
3134 static int selinux_socket_listen(struct socket *sock, int backlog)
3135 {
3136         return socket_has_perm(current, sock, SOCKET__LISTEN);
3137 }
3138
3139 static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3140 {
3141         int err;
3142         struct inode_security_struct *isec;
3143         struct inode_security_struct *newisec;
3144
3145         err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3146         if (err)
3147                 return err;
3148
3149         newisec = SOCK_INODE(newsock)->i_security;
3150
3151         isec = SOCK_INODE(sock)->i_security;
3152         newisec->sclass = isec->sclass;
3153         newisec->sid = isec->sid;
3154         newisec->initialized = 1;
3155
3156         return 0;
3157 }
3158
3159 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
3160                                   int size)
3161 {
3162         return socket_has_perm(current, sock, SOCKET__WRITE);
3163 }
3164
3165 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3166                                   int size, int flags)
3167 {
3168         return socket_has_perm(current, sock, SOCKET__READ);
3169 }
3170
3171 static int selinux_socket_getsockname(struct socket *sock)
3172 {
3173         return socket_has_perm(current, sock, SOCKET__GETATTR);
3174 }
3175
3176 static int selinux_socket_getpeername(struct socket *sock)
3177 {
3178         return socket_has_perm(current, sock, SOCKET__GETATTR);
3179 }
3180
3181 static int selinux_socket_setsockopt(struct socket *sock,int level,int optname)
3182 {
3183         return socket_has_perm(current, sock, SOCKET__SETOPT);
3184 }
3185
3186 static int selinux_socket_getsockopt(struct socket *sock, int level,
3187                                      int optname)
3188 {
3189         return socket_has_perm(current, sock, SOCKET__GETOPT);
3190 }
3191
3192 static int selinux_socket_shutdown(struct socket *sock, int how)
3193 {
3194         return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3195 }
3196
3197 static int selinux_socket_unix_stream_connect(struct socket *sock,
3198                                               struct socket *other,
3199                                               struct sock *newsk)
3200 {
3201         struct sk_security_struct *ssec;
3202         struct inode_security_struct *isec;
3203         struct inode_security_struct *other_isec;
3204         struct avc_audit_data ad;
3205         int err;
3206
3207         err = secondary_ops->unix_stream_connect(sock, other, newsk);
3208         if (err)
3209                 return err;
3210
3211         isec = SOCK_INODE(sock)->i_security;
3212         other_isec = SOCK_INODE(other)->i_security;
3213
3214         AVC_AUDIT_DATA_INIT(&ad,NET);
3215         ad.u.net.sk = other->sk;
3216
3217         err = avc_has_perm(isec->sid, other_isec->sid,
3218                            isec->sclass,
3219                            UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3220         if (err)
3221                 return err;
3222
3223         /* connecting socket */
3224         ssec = sock->sk->sk_security;
3225         ssec->peer_sid = other_isec->sid;
3226
3227         /* server child socket */
3228         ssec = newsk->sk_security;
3229         ssec->peer_sid = isec->sid;
3230
3231         return 0;
3232 }
3233
3234 static int selinux_socket_unix_may_send(struct socket *sock,
3235                                         struct socket *other)
3236 {
3237         struct inode_security_struct *isec;
3238         struct inode_security_struct *other_isec;
3239         struct avc_audit_data ad;
3240         int err;
3241
3242         isec = SOCK_INODE(sock)->i_security;
3243         other_isec = SOCK_INODE(other)->i_security;
3244
3245         AVC_AUDIT_DATA_INIT(&ad,NET);
3246         ad.u.net.sk = other->sk;
3247
3248         err = avc_has_perm(isec->sid, other_isec->sid,
3249                            isec->sclass, SOCKET__SENDTO, &ad);
3250         if (err)
3251                 return err;
3252
3253         return 0;
3254 }
3255
3256 static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
3257 {
3258         u16 family;
3259         char *addrp;
3260         int len, err = 0;
3261         u32 netif_perm, node_perm, node_sid, if_sid, recv_perm = 0;
3262         u32 sock_sid = 0;
3263         u16 sock_class = 0;
3264         struct socket *sock;
3265         struct net_device *dev;
3266         struct avc_audit_data ad;
3267
3268         family = sk->sk_family;
3269         if (family != PF_INET && family != PF_INET6)
3270                 goto out;
3271
3272         /* Handle mapped IPv4 packets arriving via IPv6 sockets */
3273         if (family == PF_INET6 && skb->protocol == ntohs(ETH_P_IP))
3274                 family = PF_INET;
3275
3276         read_lock_bh(&sk->sk_callback_lock);
3277         sock = sk->sk_socket;
3278         if (sock) {
3279                 struct inode *inode;
3280                 inode = SOCK_INODE(sock);
3281                 if (inode) {
3282                         struct inode_security_struct *isec;
3283                         isec = inode->i_security;
3284                         sock_sid = isec->sid;
3285                         sock_class = isec->sclass;
3286                 }
3287         }
3288         read_unlock_bh(&sk->sk_callback_lock);
3289         if (!sock_sid)
3290                 goto out;
3291
3292         dev = skb->dev;
3293         if (!dev)
3294                 goto out;
3295
3296         err = sel_netif_sids(dev, &if_sid, NULL);
3297         if (err)
3298                 goto out;
3299
3300         switch (sock_class) {
3301         case SECCLASS_UDP_SOCKET:
3302                 netif_perm = NETIF__UDP_RECV;
3303                 node_perm = NODE__UDP_RECV;
3304                 recv_perm = UDP_SOCKET__RECV_MSG;
3305                 break;
3306
3307         case SECCLASS_TCP_SOCKET:
3308                 netif_perm = NETIF__TCP_RECV;
3309                 node_perm = NODE__TCP_RECV;
3310                 recv_perm = TCP_SOCKET__RECV_MSG;
3311                 break;
3312
3313         default:
3314                 netif_perm = NETIF__RAWIP_RECV;
3315                 node_perm = NODE__RAWIP_RECV;
3316                 break;
3317         }
3318
3319         AVC_AUDIT_DATA_INIT(&ad, NET);
3320         ad.u.net.netif = dev->name;
3321         ad.u.net.family = family;
3322
3323         err = selinux_parse_skb(skb, &ad, &addrp, &len, 1);
3324         if (err)
3325                 goto out;
3326
3327         err = avc_has_perm(sock_sid, if_sid, SECCLASS_NETIF, netif_perm, &ad);
3328         if (err)
3329                 goto out;
3330
3331         /* Fixme: this lookup is inefficient */
3332         err = security_node_sid(family, addrp, len, &node_sid);
3333         if (err)
3334                 goto out;
3335
3336         err = avc_has_perm(sock_sid, node_sid, SECCLASS_NODE, node_perm, &ad);
3337         if (err)
3338                 goto out;
3339
3340         if (recv_perm) {
3341                 u32 port_sid;
3342
3343                 /* Fixme: make this more efficient */
3344                 err = security_port_sid(sk->sk_family, sk->sk_type,
3345                                         sk->sk_protocol, ntohs(ad.u.net.sport),
3346                                         &port_sid);
3347                 if (err)
3348                         goto out;
3349
3350                 err = avc_has_perm(sock_sid, port_sid,
3351                                    sock_class, recv_perm, &ad);
3352         }
3353 out:
3354         return err;
3355 }
3356
3357 static int selinux_socket_getpeersec(struct socket *sock, char __user *optval,
3358                                      int __user *optlen, unsigned len)
3359 {
3360         int err = 0;
3361         char *scontext;
3362         u32 scontext_len;
3363         struct sk_security_struct *ssec;
3364         struct inode_security_struct *isec;
3365
3366         isec = SOCK_INODE(sock)->i_security;
3367         if (isec->sclass != SECCLASS_UNIX_STREAM_SOCKET) {
3368                 err = -ENOPROTOOPT;
3369                 goto out;
3370         }
3371
3372         ssec = sock->sk->sk_security;
3373
3374         err = security_sid_to_context(ssec->peer_sid, &scontext, &scontext_len);
3375         if (err)
3376                 goto out;
3377
3378         if (scontext_len > len) {
3379                 err = -ERANGE;
3380                 goto out_len;
3381         }
3382
3383         if (copy_to_user(optval, scontext, scontext_len))
3384                 err = -EFAULT;
3385
3386 out_len:
3387         if (put_user(scontext_len, optlen))
3388                 err = -EFAULT;
3389
3390         kfree(scontext);
3391 out:
3392         return err;
3393 }
3394
3395 static int selinux_sk_alloc_security(struct sock *sk, int family, int priority)
3396 {
3397         return sk_alloc_security(sk, family, priority);
3398 }
3399
3400 static void selinux_sk_free_security(struct sock *sk)
3401 {
3402         sk_free_security(sk);
3403 }
3404
3405 static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
3406 {
3407         int err = 0;
3408         u32 perm;
3409         struct nlmsghdr *nlh;
3410         struct socket *sock = sk->sk_socket;
3411         struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
3412
3413         if (skb->len < NLMSG_SPACE(0)) {
3414                 err = -EINVAL;
3415                 goto out;
3416         }
3417         nlh = (struct nlmsghdr *)skb->data;
3418
3419         err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
3420         if (err) {
3421                 if (err == -EINVAL) {
3422                         audit_log(current->audit_context,
3423                                   "SELinux:  unrecognized netlink message"
3424                                   " type=%hu for sclass=%hu\n",
3425                                   nlh->nlmsg_type, isec->sclass);
3426                         if (!selinux_enforcing)
3427                                 err = 0;
3428                 }
3429
3430                 /* Ignore */
3431                 if (err == -ENOENT)
3432                         err = 0;
3433                 goto out;
3434         }
3435
3436         err = socket_has_perm(current, sock, perm);
3437 out:
3438         return err;
3439 }
3440
3441 #ifdef CONFIG_NETFILTER
3442
3443 static unsigned int selinux_ip_postroute_last(unsigned int hooknum,
3444                                               struct sk_buff **pskb,
3445                                               const struct net_device *in,
3446                                               const struct net_device *out,
3447                                               int (*okfn)(struct sk_buff *),
3448                                               u16 family)
3449 {
3450         char *addrp;
3451         int len, err = NF_ACCEPT;
3452         u32 netif_perm, node_perm, node_sid, if_sid, send_perm = 0;
3453         struct sock *sk;
3454         struct socket *sock;
3455         struct inode *inode;
3456         struct sk_buff *skb = *pskb;
3457         struct inode_security_struct *isec;
3458         struct avc_audit_data ad;
3459         struct net_device *dev = (struct net_device *)out;
3460
3461         sk = skb->sk;
3462         if (!sk)
3463                 goto out;
3464
3465         sock = sk->sk_socket;
3466         if (!sock)
3467                 goto out;
3468
3469         inode = SOCK_INODE(sock);
3470         if (!inode)
3471                 goto out;
3472
3473         err = sel_netif_sids(dev, &if_sid, NULL);
3474         if (err)
3475                 goto out;
3476
3477         isec = inode->i_security;
3478
3479         switch (isec->sclass) {
3480         case SECCLASS_UDP_SOCKET:
3481                 netif_perm = NETIF__UDP_SEND;
3482                 node_perm = NODE__UDP_SEND;
3483                 send_perm = UDP_SOCKET__SEND_MSG;
3484                 break;
3485
3486         case SECCLASS_TCP_SOCKET:
3487                 netif_perm = NETIF__TCP_SEND;
3488                 node_perm = NODE__TCP_SEND;
3489                 send_perm = TCP_SOCKET__SEND_MSG;
3490                 break;
3491
3492         default:
3493                 netif_perm = NETIF__RAWIP_SEND;
3494                 node_perm = NODE__RAWIP_SEND;
3495                 break;
3496         }
3497
3498
3499         AVC_AUDIT_DATA_INIT(&ad, NET);
3500         ad.u.net.netif = dev->name;
3501         ad.u.net.family = family;
3502
3503         err = selinux_parse_skb(skb, &ad, &addrp,
3504                                 &len, 0) ? NF_DROP : NF_ACCEPT;
3505         if (err != NF_ACCEPT)
3506                 goto out;
3507
3508         err = avc_has_perm(isec->sid, if_sid, SECCLASS_NETIF,
3509                            netif_perm, &ad) ? NF_DROP : NF_ACCEPT;
3510         if (err != NF_ACCEPT)
3511                 goto out;
3512
3513         /* Fixme: this lookup is inefficient */
3514         err = security_node_sid(family, addrp, len,
3515                                 &node_sid) ? NF_DROP : NF_ACCEPT;
3516         if (err != NF_ACCEPT)
3517                 goto out;
3518
3519         err = avc_has_perm(isec->sid, node_sid, SECCLASS_NODE,
3520                            node_perm, &ad) ? NF_DROP : NF_ACCEPT;
3521         if (err != NF_ACCEPT)
3522                 goto out;
3523
3524         if (send_perm) {
3525                 u32 port_sid;
3526
3527                 /* Fixme: make this more efficient */
3528                 err = security_port_sid(sk->sk_family,
3529                                         sk->sk_type,
3530                                         sk->sk_protocol,
3531                                         ntohs(ad.u.net.dport),
3532                                         &port_sid) ? NF_DROP : NF_ACCEPT;
3533                 if (err != NF_ACCEPT)
3534                         goto out;
3535
3536                 err = avc_has_perm(isec->sid, port_sid, isec->sclass,
3537                                    send_perm, &ad) ? NF_DROP : NF_ACCEPT;
3538         }
3539
3540 out:
3541         return err;
3542 }
3543
3544 static unsigned int selinux_ipv4_postroute_last(unsigned int hooknum,
3545                                                 struct sk_buff **pskb,
3546                                                 const struct net_device *in,
3547                                                 const struct net_device *out,
3548                                                 int (*okfn)(struct sk_buff *))
3549 {
3550         return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET);
3551 }
3552
3553 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3554
3555 static unsigned int selinux_ipv6_postroute_last(unsigned int hooknum,
3556                                                 struct sk_buff **pskb,
3557                                                 const struct net_device *in,
3558                                                 const struct net_device *out,
3559                                                 int (*okfn)(struct sk_buff *))
3560 {
3561         return selinux_ip_postroute_last(hooknum, pskb, in, out, okfn, PF_INET6);
3562 }
3563
3564 #endif  /* IPV6 */
3565
3566 #endif  /* CONFIG_NETFILTER */
3567
3568 #else
3569
3570 static inline int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
3571 {
3572         return 0;
3573 }
3574
3575 #endif  /* CONFIG_SECURITY_NETWORK */
3576
3577 static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
3578 {
3579         struct task_security_struct *tsec;
3580         struct av_decision avd;
3581         int err;
3582
3583         err = secondary_ops->netlink_send(sk, skb);
3584         if (err)
3585                 return err;
3586
3587         tsec = current->security;
3588
3589         avd.allowed = 0;
3590         avc_has_perm_noaudit(tsec->sid, tsec->sid,
3591                                 SECCLASS_CAPABILITY, ~0, &avd);
3592         cap_mask(NETLINK_CB(skb).eff_cap, avd.allowed);
3593
3594         if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
3595                 err = selinux_nlmsg_perm(sk, skb);
3596
3597         return err;
3598 }
3599
3600 static int selinux_netlink_recv(struct sk_buff *skb)
3601 {
3602         if (!cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN))
3603                 return -EPERM;
3604         return 0;
3605 }
3606
3607 static int ipc_alloc_security(struct task_struct *task,
3608                               struct kern_ipc_perm *perm,
3609                               u16 sclass)
3610 {
3611         struct task_security_struct *tsec = task->security;
3612         struct ipc_security_struct *isec;
3613
3614         isec = kmalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
3615         if (!isec)
3616                 return -ENOMEM;
3617
3618         memset(isec, 0, sizeof(struct ipc_security_struct));
3619         isec->magic = SELINUX_MAGIC;
3620         isec->sclass = sclass;
3621         isec->ipc_perm = perm;
3622         if (tsec) {
3623                 isec->sid = tsec->sid;
3624         } else {
3625                 isec->sid = SECINITSID_UNLABELED;
3626         }
3627         perm->security = isec;
3628
3629         return 0;
3630 }
3631
3632 static void ipc_free_security(struct kern_ipc_perm *perm)
3633 {
3634         struct ipc_security_struct *isec = perm->security;
3635         if (!isec || isec->magic != SELINUX_MAGIC)
3636                 return;
3637
3638         perm->security = NULL;
3639         kfree(isec);
3640 }
3641
3642 static int msg_msg_alloc_security(struct msg_msg *msg)
3643 {
3644         struct msg_security_struct *msec;
3645
3646         msec = kmalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
3647         if (!msec)
3648                 return -ENOMEM;
3649
3650         memset(msec, 0, sizeof(struct msg_security_struct));
3651         msec->magic = SELINUX_MAGIC;
3652         msec->msg = msg;
3653         msec->sid = SECINITSID_UNLABELED;
3654         msg->security = msec;
3655
3656         return 0;
3657 }
3658
3659 static void msg_msg_free_security(struct msg_msg *msg)
3660 {
3661         struct msg_security_struct *msec = msg->security;
3662         if (!msec || msec->magic != SELINUX_MAGIC)
3663                 return;
3664
3665         msg->security = NULL;
3666         kfree(msec);
3667 }
3668
3669 static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
3670                         u32 perms)
3671 {
3672         struct task_security_struct *tsec;
3673         struct ipc_security_struct *isec;
3674         struct avc_audit_data ad;
3675
3676         tsec = current->security;
3677         isec = ipc_perms->security;
3678
3679         AVC_AUDIT_DATA_INIT(&ad, IPC);
3680         ad.u.ipc_id = ipc_perms->key;
3681
3682         return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, &ad);
3683 }
3684
3685 static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
3686 {
3687         return msg_msg_alloc_security(msg);
3688 }
3689
3690 static void selinux_msg_msg_free_security(struct msg_msg *msg)
3691 {
3692         msg_msg_free_security(msg);
3693 }
3694
3695 /* message queue security operations */
3696 static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
3697 {
3698         struct task_security_struct *tsec;
3699         struct ipc_security_struct *isec;
3700         struct avc_audit_data ad;
3701         int rc;
3702
3703         rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
3704         if (rc)
3705                 return rc;
3706
3707         tsec = current->security;
3708         isec = msq->q_perm.security;
3709
3710         AVC_AUDIT_DATA_INIT(&ad, IPC);
3711         ad.u.ipc_id = msq->q_perm.key;
3712
3713         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3714                           MSGQ__CREATE, &ad);
3715         if (rc) {
3716                 ipc_free_security(&msq->q_perm);
3717                 return rc;
3718         }
3719         return 0;
3720 }
3721
3722 static void selinux_msg_queue_free_security(struct msg_queue *msq)
3723 {
3724         ipc_free_security(&msq->q_perm);
3725 }
3726
3727 static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
3728 {
3729         struct task_security_struct *tsec;
3730         struct ipc_security_struct *isec;
3731         struct avc_audit_data ad;
3732
3733         tsec = current->security;
3734         isec = msq->q_perm.security;
3735
3736         AVC_AUDIT_DATA_INIT(&ad, IPC);
3737         ad.u.ipc_id = msq->q_perm.key;
3738
3739         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3740                             MSGQ__ASSOCIATE, &ad);
3741 }
3742
3743 static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
3744 {
3745         int err;
3746         int perms;
3747
3748         switch(cmd) {
3749         case IPC_INFO:
3750         case MSG_INFO:
3751                 /* No specific object, just general system-wide information. */
3752                 return task_has_system(current, SYSTEM__IPC_INFO);
3753         case IPC_STAT:
3754         case MSG_STAT:
3755                 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
3756                 break;
3757         case IPC_SET:
3758                 perms = MSGQ__SETATTR;
3759                 break;
3760         case IPC_RMID:
3761                 perms = MSGQ__DESTROY;
3762                 break;
3763         default:
3764                 return 0;
3765         }
3766
3767         err = ipc_has_perm(&msq->q_perm, perms);
3768         return err;
3769 }
3770
3771 static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
3772 {
3773         struct task_security_struct *tsec;
3774         struct ipc_security_struct *isec;
3775         struct msg_security_struct *msec;
3776         struct avc_audit_data ad;
3777         int rc;
3778
3779         tsec = current->security;
3780         isec = msq->q_perm.security;
3781         msec = msg->security;
3782
3783         /*
3784          * First time through, need to assign label to the message
3785          */
3786         if (msec->sid == SECINITSID_UNLABELED) {
3787                 /*
3788                  * Compute new sid based on current process and
3789                  * message queue this message will be stored in
3790                  */
3791                 rc = security_transition_sid(tsec->sid,
3792                                              isec->sid,
3793                                              SECCLASS_MSG,
3794                                              &msec->sid);
3795                 if (rc)
3796                         return rc;
3797         }
3798
3799         AVC_AUDIT_DATA_INIT(&ad, IPC);
3800         ad.u.ipc_id = msq->q_perm.key;
3801
3802         /* Can this process write to the queue? */
3803         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_MSGQ,
3804                           MSGQ__WRITE, &ad);
3805         if (!rc)
3806                 /* Can this process send the message */
3807                 rc = avc_has_perm(tsec->sid, msec->sid,
3808                                   SECCLASS_MSG, MSG__SEND, &ad);
3809         if (!rc)
3810                 /* Can the message be put in the queue? */
3811                 rc = avc_has_perm(msec->sid, isec->sid,
3812                                   SECCLASS_MSGQ, MSGQ__ENQUEUE, &ad);
3813
3814         return rc;
3815 }
3816
3817 static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
3818                                     struct task_struct *target,
3819                                     long type, int mode)
3820 {
3821         struct task_security_struct *tsec;
3822         struct ipc_security_struct *isec;
3823         struct msg_security_struct *msec;
3824         struct avc_audit_data ad;
3825         int rc;
3826
3827         tsec = target->security;
3828         isec = msq->q_perm.security;
3829         msec = msg->security;
3830
3831         AVC_AUDIT_DATA_INIT(&ad, IPC);
3832         ad.u.ipc_id = msq->q_perm.key;
3833
3834         rc = avc_has_perm(tsec->sid, isec->sid,
3835                           SECCLASS_MSGQ, MSGQ__READ, &ad);
3836         if (!rc)
3837                 rc = avc_has_perm(tsec->sid, msec->sid,
3838                                   SECCLASS_MSG, MSG__RECEIVE, &ad);
3839         return rc;
3840 }
3841
3842 /* Shared Memory security operations */
3843 static int selinux_shm_alloc_security(struct shmid_kernel *shp)
3844 {
3845         struct task_security_struct *tsec;
3846         struct ipc_security_struct *isec;
3847         struct avc_audit_data ad;
3848         int rc;
3849
3850         rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
3851         if (rc)
3852                 return rc;
3853
3854         tsec = current->security;
3855         isec = shp->shm_perm.security;
3856
3857         AVC_AUDIT_DATA_INIT(&ad, IPC);
3858         ad.u.ipc_id = shp->shm_perm.key;
3859
3860         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3861                           SHM__CREATE, &ad);
3862         if (rc) {
3863                 ipc_free_security(&shp->shm_perm);
3864                 return rc;
3865         }
3866         return 0;
3867 }
3868
3869 static void selinux_shm_free_security(struct shmid_kernel *shp)
3870 {
3871         ipc_free_security(&shp->shm_perm);
3872 }
3873
3874 static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
3875 {
3876         struct task_security_struct *tsec;
3877         struct ipc_security_struct *isec;
3878         struct avc_audit_data ad;
3879
3880         tsec = current->security;
3881         isec = shp->shm_perm.security;
3882
3883         AVC_AUDIT_DATA_INIT(&ad, IPC);
3884         ad.u.ipc_id = shp->shm_perm.key;
3885
3886         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SHM,
3887                             SHM__ASSOCIATE, &ad);
3888 }
3889
3890 /* Note, at this point, shp is locked down */
3891 static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
3892 {
3893         int perms;
3894         int err;
3895
3896         switch(cmd) {
3897         case IPC_INFO:
3898         case SHM_INFO:
3899                 /* No specific object, just general system-wide information. */
3900                 return task_has_system(current, SYSTEM__IPC_INFO);
3901         case IPC_STAT:
3902         case SHM_STAT:
3903                 perms = SHM__GETATTR | SHM__ASSOCIATE;
3904                 break;
3905         case IPC_SET:
3906                 perms = SHM__SETATTR;
3907                 break;
3908         case SHM_LOCK:
3909         case SHM_UNLOCK:
3910                 perms = SHM__LOCK;
3911                 break;
3912         case IPC_RMID:
3913                 perms = SHM__DESTROY;
3914                 break;
3915         default:
3916                 return 0;
3917         }
3918
3919         err = ipc_has_perm(&shp->shm_perm, perms);
3920         return err;
3921 }
3922
3923 static int selinux_shm_shmat(struct shmid_kernel *shp,
3924                              char __user *shmaddr, int shmflg)
3925 {
3926         u32 perms;
3927         int rc;
3928
3929         rc = secondary_ops->shm_shmat(shp, shmaddr, shmflg);
3930         if (rc)
3931                 return rc;
3932
3933         if (shmflg & SHM_RDONLY)
3934                 perms = SHM__READ;
3935         else
3936                 perms = SHM__READ | SHM__WRITE;
3937
3938         return ipc_has_perm(&shp->shm_perm, perms);
3939 }
3940
3941 /* Semaphore security operations */
3942 static int selinux_sem_alloc_security(struct sem_array *sma)
3943 {
3944         struct task_security_struct *tsec;
3945         struct ipc_security_struct *isec;
3946         struct avc_audit_data ad;
3947         int rc;
3948
3949         rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
3950         if (rc)
3951                 return rc;
3952
3953         tsec = current->security;
3954         isec = sma->sem_perm.security;
3955
3956         AVC_AUDIT_DATA_INIT(&ad, IPC);
3957         ad.u.ipc_id = sma->sem_perm.key;
3958
3959         rc = avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
3960                           SEM__CREATE, &ad);
3961         if (rc) {
3962                 ipc_free_security(&sma->sem_perm);
3963                 return rc;
3964         }
3965         return 0;
3966 }
3967
3968 static void selinux_sem_free_security(struct sem_array *sma)
3969 {
3970         ipc_free_security(&sma->sem_perm);
3971 }
3972
3973 static int selinux_sem_associate(struct sem_array *sma, int semflg)
3974 {
3975         struct task_security_struct *tsec;
3976         struct ipc_security_struct *isec;
3977         struct avc_audit_data ad;
3978
3979         tsec = current->security;
3980         isec = sma->sem_perm.security;
3981
3982         AVC_AUDIT_DATA_INIT(&ad, IPC);
3983         ad.u.ipc_id = sma->sem_perm.key;
3984
3985         return avc_has_perm(tsec->sid, isec->sid, SECCLASS_SEM,
3986                             SEM__ASSOCIATE, &ad);
3987 }
3988
3989 /* Note, at this point, sma is locked down */
3990 static int selinux_sem_semctl(struct sem_array *sma, int cmd)
3991 {
3992         int err;
3993         u32 perms;
3994
3995         switch(cmd) {
3996         case IPC_INFO:
3997         case SEM_INFO:
3998                 /* No specific object, just general system-wide information. */
3999                 return task_has_system(current, SYSTEM__IPC_INFO);
4000         case GETPID:
4001         case GETNCNT:
4002         case GETZCNT:
4003                 perms = SEM__GETATTR;
4004                 break;
4005         case GETVAL:
4006         case GETALL:
4007                 perms = SEM__READ;
4008                 break;
4009         case SETVAL:
4010         case SETALL:
4011                 perms = SEM__WRITE;
4012                 break;
4013         case IPC_RMID:
4014                 perms = SEM__DESTROY;
4015                 break;
4016         case IPC_SET:
4017                 perms = SEM__SETATTR;
4018                 break;
4019         case IPC_STAT:
4020         case SEM_STAT:
4021                 perms = SEM__GETATTR | SEM__ASSOCIATE;
4022                 break;
4023         default:
4024                 return 0;
4025         }
4026
4027         err = ipc_has_perm(&sma->sem_perm, perms);
4028         return err;
4029 }
4030
4031 static int selinux_sem_semop(struct sem_array *sma,
4032                              struct sembuf *sops, unsigned nsops, int alter)
4033 {
4034         u32 perms;
4035
4036         if (alter)
4037                 perms = SEM__READ | SEM__WRITE;
4038         else
4039                 perms = SEM__READ;
4040
4041         return ipc_has_perm(&sma->sem_perm, perms);
4042 }
4043
4044 static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
4045 {
4046         u32 av = 0;
4047
4048         av = 0;
4049         if (flag & S_IRUGO)
4050                 av |= IPC__UNIX_READ;
4051         if (flag & S_IWUGO)
4052                 av |= IPC__UNIX_WRITE;
4053
4054         if (av == 0)
4055                 return 0;
4056
4057         return ipc_has_perm(ipcp, av);
4058 }
4059
4060 /* module stacking operations */
4061 static int selinux_register_security (const char *name, struct security_operations *ops)
4062 {
4063         if (secondary_ops != original_ops) {
4064                 printk(KERN_INFO "%s:  There is already a secondary security "
4065                        "module registered.\n", __FUNCTION__);
4066                 return -EINVAL;
4067         }
4068
4069         secondary_ops = ops;
4070
4071         printk(KERN_INFO "%s:  Registering secondary module %s\n",
4072                __FUNCTION__,
4073                name);
4074
4075         return 0;
4076 }
4077
4078 static int selinux_unregister_security (const char *name, struct security_operations *ops)
4079 {
4080         if (ops != secondary_ops) {
4081                 printk (KERN_INFO "%s:  trying to unregister a security module "
4082                         "that is not registered.\n", __FUNCTION__);
4083                 return -EINVAL;
4084         }
4085
4086         secondary_ops = original_ops;
4087
4088         return 0;
4089 }
4090
4091 static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode)
4092 {
4093         if (inode)
4094                 inode_doinit_with_dentry(inode, dentry);
4095 }
4096
4097 static int selinux_getprocattr(struct task_struct *p,
4098                                char *name, void *value, size_t size)
4099 {
4100         struct task_security_struct *tsec;
4101         u32 sid, len;
4102         char *context;
4103         int error;
4104
4105         if (current != p) {
4106                 error = task_has_perm(current, p, PROCESS__GETATTR);
4107                 if (error)
4108                         return error;
4109         }
4110
4111         if (!size)
4112                 return -ERANGE;
4113
4114         tsec = p->security;
4115
4116         if (!strcmp(name, "current"))
4117                 sid = tsec->sid;
4118         else if (!strcmp(name, "prev"))
4119                 sid = tsec->osid;
4120         else if (!strcmp(name, "exec"))
4121                 sid = tsec->exec_sid;
4122         else if (!strcmp(name, "fscreate"))
4123                 sid = tsec->create_sid;
4124         else
4125                 return -EINVAL;
4126
4127         if (!sid)
4128                 return 0;
4129
4130         error = security_sid_to_context(sid, &context, &len);
4131         if (error)
4132                 return error;
4133         if (len > size) {
4134                 kfree(context);
4135                 return -ERANGE;
4136         }
4137         memcpy(value, context, len);
4138         kfree(context);
4139         return len;
4140 }
4141
4142 static int selinux_setprocattr(struct task_struct *p,
4143                                char *name, void *value, size_t size)
4144 {
4145         struct task_security_struct *tsec;
4146         u32 sid = 0;
4147         int error;
4148         char *str = value;
4149
4150         if (current != p) {
4151                 /* SELinux only allows a process to change its own
4152                    security attributes. */
4153                 return -EACCES;
4154         }
4155
4156         /*
4157          * Basic control over ability to set these attributes at all.
4158          * current == p, but we'll pass them separately in case the
4159          * above restriction is ever removed.
4160          */
4161         if (!strcmp(name, "exec"))
4162                 error = task_has_perm(current, p, PROCESS__SETEXEC);
4163         else if (!strcmp(name, "fscreate"))
4164                 error = task_has_perm(current, p, PROCESS__SETFSCREATE);
4165         else if (!strcmp(name, "current"))
4166                 error = task_has_perm(current, p, PROCESS__SETCURRENT);
4167         else
4168                 error = -EINVAL;
4169         if (error)
4170                 return error;
4171
4172         /* Obtain a SID for the context, if one was specified. */
4173         if (size && str[1] && str[1] != '\n') {
4174                 if (str[size-1] == '\n') {
4175                         str[size-1] = 0;
4176                         size--;
4177                 }
4178                 error = security_context_to_sid(value, size, &sid);
4179                 if (error)
4180                         return error;
4181         }
4182
4183         /* Permission checking based on the specified context is
4184            performed during the actual operation (execve,
4185            open/mkdir/...), when we know the full context of the
4186            operation.  See selinux_bprm_set_security for the execve
4187            checks and may_create for the file creation checks. The
4188            operation will then fail if the context is not permitted. */
4189         tsec = p->security;
4190         if (!strcmp(name, "exec"))
4191                 tsec->exec_sid = sid;
4192         else if (!strcmp(name, "fscreate"))
4193                 tsec->create_sid = sid;
4194         else if (!strcmp(name, "current")) {
4195                 struct av_decision avd;
4196
4197                 if (sid == 0)
4198                         return -EINVAL;
4199
4200                 /* Only allow single threaded processes to change context */
4201                 if (atomic_read(&p->mm->mm_users) != 1) {
4202                         struct task_struct *g, *t;
4203                         struct mm_struct *mm = p->mm;
4204                         read_lock(&tasklist_lock);
4205                         do_each_thread(g, t)
4206                                 if (t->mm == mm && t != p) {
4207                                         read_unlock(&tasklist_lock);
4208                                         return -EPERM;
4209                                 }
4210                         while_each_thread(g, t);
4211                         read_unlock(&tasklist_lock);
4212                 }
4213
4214                 /* Check permissions for the transition. */
4215                 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
4216                                      PROCESS__DYNTRANSITION, NULL);
4217                 if (error)
4218                         return error;
4219
4220                 /* Check for ptracing, and update the task SID if ok.
4221                    Otherwise, leave SID unchanged and fail. */
4222                 task_lock(p);
4223                 if (p->ptrace & PT_PTRACED) {
4224                         error = avc_has_perm_noaudit(tsec->ptrace_sid, sid,
4225                                                      SECCLASS_PROCESS,
4226                                                      PROCESS__PTRACE, &avd);
4227                         if (!error)
4228                                 tsec->sid = sid;
4229                         task_unlock(p);
4230                         avc_audit(tsec->ptrace_sid, sid, SECCLASS_PROCESS,
4231                                   PROCESS__PTRACE, &avd, error, NULL);
4232                         if (error)
4233                                 return error;
4234                 } else {
4235                         tsec->sid = sid;
4236                         task_unlock(p);
4237                 }
4238         }
4239         else
4240                 return -EINVAL;
4241
4242         return size;
4243 }
4244
4245 static struct security_operations selinux_ops = {
4246         .ptrace =                       selinux_ptrace,
4247         .capget =                       selinux_capget,
4248         .capset_check =                 selinux_capset_check,
4249         .capset_set =                   selinux_capset_set,
4250         .sysctl =                       selinux_sysctl,
4251         .capable =                      selinux_capable,
4252         .quotactl =                     selinux_quotactl,
4253         .quota_on =                     selinux_quota_on,
4254         .syslog =                       selinux_syslog,
4255         .vm_enough_memory =             selinux_vm_enough_memory,
4256
4257         .netlink_send =                 selinux_netlink_send,
4258         .netlink_recv =                 selinux_netlink_recv,
4259
4260         .bprm_alloc_security =          selinux_bprm_alloc_security,
4261         .bprm_free_security =           selinux_bprm_free_security,
4262         .bprm_apply_creds =             selinux_bprm_apply_creds,
4263         .bprm_post_apply_creds =        selinux_bprm_post_apply_creds,
4264         .bprm_set_security =            selinux_bprm_set_security,
4265         .bprm_check_security =          selinux_bprm_check_security,
4266         .bprm_secureexec =              selinux_bprm_secureexec,
4267
4268         .sb_alloc_security =            selinux_sb_alloc_security,
4269         .sb_free_security =             selinux_sb_free_security,
4270         .sb_copy_data =                 selinux_sb_copy_data,
4271         .sb_kern_mount =                selinux_sb_kern_mount,
4272         .sb_statfs =                    selinux_sb_statfs,
4273         .sb_mount =                     selinux_mount,
4274         .sb_umount =                    selinux_umount,
4275
4276         .inode_alloc_security =         selinux_inode_alloc_security,
4277         .inode_free_security =          selinux_inode_free_security,
4278         .inode_create =                 selinux_inode_create,
4279         .inode_post_create =            selinux_inode_post_create,
4280         .inode_link =                   selinux_inode_link,
4281         .inode_post_link =              selinux_inode_post_link,
4282         .inode_unlink =                 selinux_inode_unlink,
4283         .inode_symlink =                selinux_inode_symlink,
4284         .inode_post_symlink =           selinux_inode_post_symlink,
4285         .inode_mkdir =                  selinux_inode_mkdir,
4286         .inode_post_mkdir =             selinux_inode_post_mkdir,
4287         .inode_rmdir =                  selinux_inode_rmdir,
4288         .inode_mknod =                  selinux_inode_mknod,
4289         .inode_post_mknod =             selinux_inode_post_mknod,
4290         .inode_rename =                 selinux_inode_rename,
4291         .inode_post_rename =            selinux_inode_post_rename,
4292         .inode_readlink =               selinux_inode_readlink,
4293         .inode_follow_link =            selinux_inode_follow_link,
4294         .inode_permission =             selinux_inode_permission,
4295         .inode_setattr =                selinux_inode_setattr,
4296         .inode_getattr =                selinux_inode_getattr,
4297         .inode_setxattr =               selinux_inode_setxattr,
4298         .inode_post_setxattr =          selinux_inode_post_setxattr,
4299         .inode_getxattr =               selinux_inode_getxattr,
4300         .inode_listxattr =              selinux_inode_listxattr,
4301         .inode_removexattr =            selinux_inode_removexattr,
4302         .inode_getsecurity =            selinux_inode_getsecurity,
4303         .inode_setsecurity =            selinux_inode_setsecurity,
4304         .inode_listsecurity =           selinux_inode_listsecurity,
4305
4306         .file_permission =              selinux_file_permission,
4307         .file_alloc_security =          selinux_file_alloc_security,
4308         .file_free_security =           selinux_file_free_security,
4309         .file_ioctl =                   selinux_file_ioctl,
4310         .file_mmap =                    selinux_file_mmap,
4311         .file_mprotect =                selinux_file_mprotect,
4312         .file_lock =                    selinux_file_lock,
4313         .file_fcntl =                   selinux_file_fcntl,
4314         .file_set_fowner =              selinux_file_set_fowner,
4315         .file_send_sigiotask =          selinux_file_send_sigiotask,
4316         .file_receive =                 selinux_file_receive,
4317
4318         .task_create =                  selinux_task_create,
4319         .task_alloc_security =          selinux_task_alloc_security,
4320         .task_free_security =           selinux_task_free_security,
4321         .task_setuid =                  selinux_task_setuid,
4322         .task_post_setuid =             selinux_task_post_setuid,
4323         .task_setgid =                  selinux_task_setgid,
4324         .task_setpgid =                 selinux_task_setpgid,
4325         .task_getpgid =                 selinux_task_getpgid,
4326         .task_getsid =                  selinux_task_getsid,
4327         .task_setgroups =               selinux_task_setgroups,
4328         .task_setnice =                 selinux_task_setnice,
4329         .task_setrlimit =               selinux_task_setrlimit,
4330         .task_setscheduler =            selinux_task_setscheduler,
4331         .task_getscheduler =            selinux_task_getscheduler,
4332         .task_kill =                    selinux_task_kill,
4333         .task_wait =                    selinux_task_wait,
4334         .task_prctl =                   selinux_task_prctl,
4335         .task_reparent_to_init =        selinux_task_reparent_to_init,
4336         .task_to_inode =                selinux_task_to_inode,
4337
4338         .ipc_permission =               selinux_ipc_permission,
4339
4340         .msg_msg_alloc_security =       selinux_msg_msg_alloc_security,
4341         .msg_msg_free_security =        selinux_msg_msg_free_security,
4342
4343         .msg_queue_alloc_security =     selinux_msg_queue_alloc_security,
4344         .msg_queue_free_security =      selinux_msg_queue_free_security,
4345         .msg_queue_associate =          selinux_msg_queue_associate,
4346         .msg_queue_msgctl =             selinux_msg_queue_msgctl,
4347         .msg_queue_msgsnd =             selinux_msg_queue_msgsnd,
4348         .msg_queue_msgrcv =             selinux_msg_queue_msgrcv,
4349
4350         .shm_alloc_security =           selinux_shm_alloc_security,
4351         .shm_free_security =            selinux_shm_free_security,
4352         .shm_associate =                selinux_shm_associate,
4353         .shm_shmctl =                   selinux_shm_shmctl,
4354         .shm_shmat =                    selinux_shm_shmat,
4355
4356         .sem_alloc_security =           selinux_sem_alloc_security,
4357         .sem_free_security =            selinux_sem_free_security,
4358         .sem_associate =                selinux_sem_associate,
4359         .sem_semctl =                   selinux_sem_semctl,
4360         .sem_semop =                    selinux_sem_semop,
4361
4362         .register_security =            selinux_register_security,
4363         .unregister_security =          selinux_unregister_security,
4364
4365         .d_instantiate =                selinux_d_instantiate,
4366
4367         .getprocattr =                  selinux_getprocattr,
4368         .setprocattr =                  selinux_setprocattr,
4369
4370 #ifdef CONFIG_SECURITY_NETWORK
4371         .unix_stream_connect =          selinux_socket_unix_stream_connect,
4372         .unix_may_send =                selinux_socket_unix_may_send,
4373
4374         .socket_create =                selinux_socket_create,
4375         .socket_post_create =           selinux_socket_post_create,
4376         .socket_bind =                  selinux_socket_bind,
4377         .socket_connect =               selinux_socket_connect,
4378         .socket_listen =                selinux_socket_listen,
4379         .socket_accept =                selinux_socket_accept,
4380         .socket_sendmsg =               selinux_socket_sendmsg,
4381         .socket_recvmsg =               selinux_socket_recvmsg,
4382         .socket_getsockname =           selinux_socket_getsockname,
4383         .socket_getpeername =           selinux_socket_getpeername,
4384         .socket_getsockopt =            selinux_socket_getsockopt,
4385         .socket_setsockopt =            selinux_socket_setsockopt,
4386         .socket_shutdown =              selinux_socket_shutdown,
4387         .socket_sock_rcv_skb =          selinux_socket_sock_rcv_skb,
4388         .socket_getpeersec =            selinux_socket_getpeersec,
4389         .sk_alloc_security =            selinux_sk_alloc_security,
4390         .sk_free_security =             selinux_sk_free_security,
4391 #endif
4392 };
4393
4394 static __init int selinux_init(void)
4395 {
4396         struct task_security_struct *tsec;
4397
4398         if (!selinux_enabled) {
4399                 printk(KERN_INFO "SELinux:  Disabled at boot.\n");
4400                 return 0;
4401         }
4402
4403         printk(KERN_INFO "SELinux:  Initializing.\n");
4404
4405         /* Set the security state for the initial task. */
4406         if (task_alloc_security(current))
4407                 panic("SELinux:  Failed to initialize initial task.\n");
4408         tsec = current->security;
4409         tsec->osid = tsec->sid = SECINITSID_KERNEL;
4410
4411         avc_init();
4412
4413         original_ops = secondary_ops = security_ops;
4414         if (!secondary_ops)
4415                 panic ("SELinux: No initial security operations\n");
4416         if (register_security (&selinux_ops))
4417                 panic("SELinux: Unable to register with kernel.\n");
4418
4419         if (selinux_enforcing) {
4420                 printk(KERN_INFO "SELinux:  Starting in enforcing mode\n");
4421         } else {
4422                 printk(KERN_INFO "SELinux:  Starting in permissive mode\n");
4423         }
4424         return 0;
4425 }
4426
4427 void selinux_complete_init(void)
4428 {
4429         printk(KERN_INFO "SELinux:  Completing initialization.\n");
4430
4431         /* Set up any superblocks initialized prior to the policy load. */
4432         printk(KERN_INFO "SELinux:  Setting up existing superblocks.\n");
4433         spin_lock(&sb_security_lock);
4434 next_sb:
4435         if (!list_empty(&superblock_security_head)) {
4436                 struct superblock_security_struct *sbsec =
4437                                 list_entry(superblock_security_head.next,
4438                                            struct superblock_security_struct,
4439                                            list);
4440                 struct super_block *sb = sbsec->sb;
4441                 spin_lock(&sb_lock);
4442                 sb->s_count++;
4443                 spin_unlock(&sb_lock);
4444                 spin_unlock(&sb_security_lock);
4445                 down_read(&sb->s_umount);
4446                 if (sb->s_root)
4447                         superblock_doinit(sb, NULL);
4448                 drop_super(sb);
4449                 spin_lock(&sb_security_lock);
4450                 list_del_init(&sbsec->list);
4451                 goto next_sb;
4452         }
4453         spin_unlock(&sb_security_lock);
4454 }
4455
4456 /* SELinux requires early initialization in order to label
4457    all processes and objects when they are created. */
4458 security_initcall(selinux_init);
4459
4460 #if defined(CONFIG_SECURITY_NETWORK) && defined(CONFIG_NETFILTER)
4461
4462 static struct nf_hook_ops selinux_ipv4_op = {
4463         .hook =         selinux_ipv4_postroute_last,
4464         .owner =        THIS_MODULE,
4465         .pf =           PF_INET,
4466         .hooknum =      NF_IP_POST_ROUTING,
4467         .priority =     NF_IP_PRI_SELINUX_LAST,
4468 };
4469
4470 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4471
4472 static struct nf_hook_ops selinux_ipv6_op = {
4473         .hook =         selinux_ipv6_postroute_last,
4474         .owner =        THIS_MODULE,
4475         .pf =           PF_INET6,
4476         .hooknum =      NF_IP6_POST_ROUTING,
4477         .priority =     NF_IP6_PRI_SELINUX_LAST,
4478 };
4479
4480 #endif  /* IPV6 */
4481
4482 static int __init selinux_nf_ip_init(void)
4483 {
4484         int err = 0;
4485
4486         if (!selinux_enabled)
4487                 goto out;
4488
4489         printk(KERN_INFO "SELinux:  Registering netfilter hooks\n");
4490
4491         err = nf_register_hook(&selinux_ipv4_op);
4492         if (err)
4493                 panic("SELinux: nf_register_hook for IPv4: error %d\n", err);
4494
4495 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4496
4497         err = nf_register_hook(&selinux_ipv6_op);
4498         if (err)
4499                 panic("SELinux: nf_register_hook for IPv6: error %d\n", err);
4500
4501 #endif  /* IPV6 */
4502 out:
4503         return err;
4504 }
4505
4506 __initcall(selinux_nf_ip_init);
4507
4508 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4509 static void selinux_nf_ip_exit(void)
4510 {
4511         printk(KERN_INFO "SELinux:  Unregistering netfilter hooks\n");
4512
4513         nf_unregister_hook(&selinux_ipv4_op);
4514 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4515         nf_unregister_hook(&selinux_ipv6_op);
4516 #endif  /* IPV6 */
4517 }
4518 #endif
4519
4520 #else /* CONFIG_SECURITY_NETWORK && CONFIG_NETFILTER */
4521
4522 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4523 #define selinux_nf_ip_exit()
4524 #endif
4525
4526 #endif /* CONFIG_SECURITY_NETWORK && CONFIG_NETFILTER */
4527
4528 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
4529 int selinux_disable(void)
4530 {
4531         extern void exit_sel_fs(void);
4532         static int selinux_disabled = 0;
4533
4534         if (ss_initialized) {
4535                 /* Not permitted after initial policy load. */
4536                 return -EINVAL;
4537         }
4538
4539         if (selinux_disabled) {
4540                 /* Only do this once. */
4541                 return -EINVAL;
4542         }
4543
4544         printk(KERN_INFO "SELinux:  Disabled at runtime.\n");
4545
4546         selinux_disabled = 1;
4547
4548         /* Reset security_ops to the secondary module, dummy or capability. */
4549         security_ops = secondary_ops;
4550
4551         /* Unregister netfilter hooks. */
4552         selinux_nf_ip_exit();
4553
4554         /* Unregister selinuxfs. */
4555         exit_sel_fs();
4556
4557         return 0;
4558 }
4559 #endif
4560
4561