-/* auditsc.c -- System-call auditing support -*- linux-c -*-
+/* auditsc.c -- System-call auditing support
* Handles all system-call specific auditing features.
*
* Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
struct audit_names {
const char *name;
unsigned long ino;
+ dev_t dev;
+ umode_t mode;
+ uid_t uid;
+ gid_t gid;
dev_t rdev;
};
+struct audit_aux_data {
+ struct audit_aux_data *next;
+ int type;
+};
+
+#define AUDIT_AUX_IPCPERM 0
+
+struct audit_aux_data_ipcctl {
+ struct audit_aux_data d;
+ struct ipc_perm p;
+ unsigned long qbytes;
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+};
+
+
/* The per-task audit context. */
struct audit_context {
int in_syscall; /* 1 if task is in a syscall */
int major; /* syscall number */
unsigned long argv[4]; /* syscall arguments */
int return_valid; /* return code is valid */
- int return_code;/* syscall return code */
+ long return_code;/* syscall return code */
int auditable; /* 1 if record should be written */
int name_count;
struct audit_names names[AUDIT_NAMES];
struct audit_context *previous; /* For nested syscalls */
+ struct audit_aux_data *aux;
/* Save things to print about task_struct */
pid_t pid;
uid_t uid, euid, suid, fsuid;
gid_t gid, egid, sgid, fsgid;
unsigned long personality;
+ int arch;
#if AUDIT_DEBUG
int put_count;
return 0;
}
-int audit_receive_filter(int type, int pid, int uid, int seq, void *data)
+int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
+ uid_t loginuid)
{
u32 flags;
struct audit_entry *entry;
err = audit_add_rule(entry, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_add_rule(entry, &audit_extlist);
+ audit_log(NULL, "auid %u added an audit rule\n", loginuid);
break;
case AUDIT_DEL:
flags =((struct audit_rule *)data)->flags;
err = audit_del_rule(data, &audit_entlist);
if (!err && (flags & AUDIT_AT_EXIT))
err = audit_del_rule(data, &audit_extlist);
+ audit_log(NULL, "auid %u removed an audit rule\n", loginuid);
break;
default:
return -EINVAL;
case AUDIT_PERS:
result = (tsk->personality == value);
break;
+ case AUDIT_ARCH:
+ if (ctx)
+ result = (ctx->arch == value);
+ break;
case AUDIT_EXIT:
if (ctx && ctx->return_valid)
break;
case AUDIT_SUCCESS:
if (ctx && ctx->return_valid)
- result = (ctx->return_code >= 0);
+ result = (ctx->return_valid == AUDITSC_SUCCESS);
break;
case AUDIT_DEVMAJOR:
if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
- if (MAJOR(ctx->names[j].rdev)==value) {
+ if (MAJOR(ctx->names[j].dev)==value) {
++result;
break;
}
case AUDIT_DEVMINOR:
if (ctx) {
for (j = 0; j < ctx->name_count; j++) {
- if (MINOR(ctx->names[j].rdev)==value) {
+ if (MINOR(ctx->names[j].dev)==value) {
++result;
break;
}
context->name_count = 0;
}
+static inline void audit_free_aux(struct audit_context *context)
+{
+ struct audit_aux_data *aux;
+
+ while ((aux = context->aux)) {
+ context->aux = aux->next;
+ kfree(aux);
+ }
+}
+
static inline void audit_zero_context(struct audit_context *context,
enum audit_state state)
{
context->name_count, count);
}
audit_free_names(context);
+ audit_free_aux(context);
kfree(context);
context = previous;
} while (context);
printk(KERN_ERR "audit: freed %d contexts\n", count);
}
+static void audit_log_task_info(struct audit_buffer *ab)
+{
+ char name[sizeof(current->comm)];
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma;
+
+ get_task_comm(name, current);
+ audit_log_format(ab, " comm=%s", name);
+
+ if (!mm)
+ return;
+
+ down_read(&mm->mmap_sem);
+ vma = mm->mmap;
+ while (vma) {
+ if ((vma->vm_flags & VM_EXECUTABLE) &&
+ vma->vm_file) {
+ audit_log_d_path(ab, "exe=",
+ vma->vm_file->f_dentry,
+ vma->vm_file->f_vfsmnt);
+ break;
+ }
+ vma = vma->vm_next;
+ }
+ up_read(&mm->mmap_sem);
+}
+
static void audit_log_exit(struct audit_context *context)
{
int i;
audit_log_format(ab, "syscall=%d", context->major);
if (context->personality != PER_LINUX)
audit_log_format(ab, " per=%lx", context->personality);
+ audit_log_format(ab, " arch=%x", context->arch);
if (context->return_valid)
- audit_log_format(ab, " exit=%d", context->return_code);
+ audit_log_format(ab, " success=%s exit=%ld",
+ (context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
+ context->return_code);
audit_log_format(ab,
" a0=%lx a1=%lx a2=%lx a3=%lx items=%d"
" pid=%d loginuid=%d uid=%d gid=%d"
context->gid,
context->euid, context->suid, context->fsuid,
context->egid, context->sgid, context->fsgid);
+ audit_log_task_info(ab);
audit_log_end(ab);
+ while (context->aux) {
+ struct audit_aux_data *aux;
+
+ ab = audit_log_start(context);
+ if (!ab)
+ continue; /* audit_panic has been called */
+
+ aux = context->aux;
+ context->aux = aux->next;
+
+ audit_log_format(ab, "auxitem=%d", aux->type);
+ switch (aux->type) {
+ case AUDIT_AUX_IPCPERM: {
+ struct audit_aux_data_ipcctl *axi = (void *)aux;
+ audit_log_format(ab,
+ " qbytes=%lx uid=%d gid=%d mode=%x",
+ axi->qbytes, axi->uid, axi->gid, axi->mode);
+ }
+ }
+ audit_log_end(ab);
+ kfree(aux);
+ }
+
for (i = 0; i < context->name_count; i++) {
ab = audit_log_start(context);
if (!ab)
continue; /* audit_panic has been called */
audit_log_format(ab, "item=%d", i);
- if (context->names[i].name)
- audit_log_format(ab, " name=%s",
- context->names[i].name);
+ if (context->names[i].name) {
+ audit_log_format(ab, " name=");
+ audit_log_untrustedstring(ab, context->names[i].name);
+ }
if (context->names[i].ino != (unsigned long)-1)
- audit_log_format(ab, " inode=%lu",
- context->names[i].ino);
- /* FIXME: should use format_dev_t, but ab structure is
- * opaque. */
- if (context->names[i].rdev != -1)
- audit_log_format(ab, " dev=%02x:%02x",
+ audit_log_format(ab, " inode=%lu dev=%02x:%02x mode=%#o"
+ " uid=%d gid=%d rdev=%02x:%02x",
+ context->names[i].ino,
+ MAJOR(context->names[i].dev),
+ MINOR(context->names[i].dev),
+ context->names[i].mode,
+ context->names[i].uid,
+ context->names[i].gid,
MAJOR(context->names[i].rdev),
MINOR(context->names[i].rdev));
audit_log_end(ab);
* then the record will be written at syscall exit time (otherwise, it
* will only be written if another part of the kernel requests that it
* be written). */
-void audit_syscall_entry(struct task_struct *tsk, int major,
+void audit_syscall_entry(struct task_struct *tsk, int arch, int major,
unsigned long a1, unsigned long a2,
unsigned long a3, unsigned long a4)
{
if (!audit_enabled)
return;
+ context->arch = arch;
context->major = major;
context->argv[0] = a1;
context->argv[1] = a2;
* filtering, or because some other part of the kernel write an audit
* message), then write out the syscall information. In call cases,
* free the names stored from getname(). */
-void audit_syscall_exit(struct task_struct *tsk, int return_code)
+void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code)
{
struct audit_context *context;
get_task_struct(tsk);
task_lock(tsk);
- context = audit_get_context(tsk, 1, return_code);
+ context = audit_get_context(tsk, valid, return_code);
task_unlock(tsk);
/* Not having a context here is ok, since the parent may have
context->in_syscall = 0;
context->auditable = 0;
+
if (context->previous) {
struct audit_context *new_context = context->previous;
context->previous = NULL;
tsk->audit_context = new_context;
} else {
audit_free_names(context);
+ audit_free_aux(context);
audit_zero_context(context, context->state);
tsk->audit_context = context;
}
{
struct audit_context *context = current->audit_context;
- BUG_ON(!context);
+ if (!context || IS_ERR(name) || !name)
+ return;
+
if (!context->in_syscall) {
#if AUDIT_DEBUG == 2
printk(KERN_ERR "%s:%d(:%d): ignoring getname(%p)\n",
BUG_ON(context->name_count >= AUDIT_NAMES);
context->names[context->name_count].name = name;
context->names[context->name_count].ino = (unsigned long)-1;
- context->names[context->name_count].rdev = -1;
++context->name_count;
}
}
#endif
}
-EXPORT_SYMBOL(audit_putname);
/* Store the inode and device from a lookup. Called from
* fs/namei.c:path_lookup(). */
-void audit_inode(const char *name, unsigned long ino, dev_t rdev)
+void audit_inode(const char *name, const struct inode *inode)
{
int idx;
struct audit_context *context = current->audit_context;
++context->ino_count;
#endif
}
- context->names[idx].ino = ino;
- context->names[idx].rdev = rdev;
+ context->names[idx].ino = inode->i_ino;
+ context->names[idx].dev = inode->i_sb->s_dev;
+ context->names[idx].mode = inode->i_mode;
+ context->names[idx].uid = inode->i_uid;
+ context->names[idx].gid = inode->i_gid;
+ context->names[idx].rdev = inode->i_rdev;
}
void audit_get_stamp(struct audit_context *ctx,
- struct timespec *t, int *serial)
+ struct timespec *t, unsigned int *serial)
{
if (ctx) {
t->tv_sec = ctx->ctime.tv_sec;
extern int audit_set_type(struct audit_buffer *ab, int type);
-int audit_set_loginuid(struct audit_context *ctx, uid_t loginuid)
+int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
{
- if (ctx) {
+ if (task->audit_context) {
struct audit_buffer *ab;
ab = audit_log_start(NULL);
if (ab) {
audit_log_format(ab, "login pid=%d uid=%u "
"old loginuid=%u new loginuid=%u",
- ctx->pid, ctx->uid, ctx->loginuid, loginuid);
+ task->pid, task->uid,
+ task->audit_context->loginuid, loginuid);
audit_set_type(ab, AUDIT_LOGIN);
audit_log_end(ab);
}
- ctx->loginuid = loginuid;
+ task->audit_context->loginuid = loginuid;
}
return 0;
}
{
return ctx ? ctx->loginuid : -1;
}
+
+int audit_ipc_perms(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode)
+{
+ struct audit_aux_data_ipcctl *ax;
+ struct audit_context *context = current->audit_context;
+
+ if (likely(!context))
+ return 0;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->qbytes = qbytes;
+ ax->uid = uid;
+ ax->gid = gid;
+ ax->mode = mode;
+
+ ax->d.type = AUDIT_AUX_IPCPERM;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+ return 0;
+}
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