-// $Id: reducecap.c,v 1.1.4.4 2004/03/05 04:59:36 ensc Exp $
+// $Id: reducecap.c,v 1.18 2005/03/24 12:44:17 ensc Exp $
// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
// based on reducecap.cc by Jacques Gelinas
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
-#include "compat.h"
+
+#include "util.h"
+#include "vserver.h"
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
-#include <strings.h>
+#include <getopt.h>
+#include <sys/param.h>
-#include "linuxcaps.h"
-#include "vserver.h"
+#define ENSC_WRAPPERS_PREFIX "reducecap: "
+#define ENSC_WRAPPERS_VSERVER 1
+#define ENSC_WRAPPERS_UNISTD 1
+#include <wrappers.h>
+
+
+#undef _POSIX_SOURCE
+#include "capability-compat.h"
+
+
+#define CMD_HELP 0x1000
+#define CMD_VERSION 0x1001
+
+#define CMD_SHOW 0x2000
+#define CMD_PID 0x2001
-#ifndef CAP_QUOTACTL
-# define CAP_QUOTACTL 29
+#define CMD_CAP 0x4000
+#define CMD_FLAG 0x4004
+#define CMD_SECURE 0x4006
+
+#ifdef VC_ENABLE_API_LEGACY
+# define CMD_OBSOLETE_CHOWN 0x8000
+# define CMD_OBSOLETE_DAC_OVERRIDE 0x8001
+# define CMD_OBSOLETE_DAC_READ_SEARCH 0x8002
+# define CMD_OBSOLETE_FOWNER 0x8003
+# define CMD_OBSOLETE_FSETID 0x8004
+# define CMD_OBSOLETE_KILL 0x8005
+# define CMD_OBSOLETE_SETGID 0x8006
+# define CMD_OBSOLETE_SETUID 0x8007
+# define CMD_OBSOLETE_SETPCAP 0x8008
+# define CMD_OBSOLETE_SYS_TTY_CONFIG 0x8009
+# define CMD_OBSOLETE_LEASE 0x800a
+# define CMD_OBSOLETE_SYS_CHROOT 0x800b
+# define CMD_OBSOLETE_X_LINUX_IMMUTABLE 0x800c
+# define CMD_OBSOLETE_X_NET_BIND_SERVICE 0x800d
+# define CMD_OBSOLETE_X_NET_BROADCAST 0x800e
+# define CMD_OBSOLETE_X_NET_ADMIN 0x800f
+# define CMD_OBSOLETE_X_NET_RAW 0x8010
+# define CMD_OBSOLETE_X_IPC_LOCK 0x8011
+# define CMD_OBSOLETE_X_IPC_OWNER 0x8012
+# define CMD_OBSOLETE_X_SYS_MODULE 0x8013
+# define CMD_OBSOLETE_X_SYS_RAWIO 0x8014
+# define CMD_OBSOLETE_X_SYS_PACCT 0x8015
+# define CMD_OBSOLETE_X_SYS_ADMIN 0x8016
+# define CMD_OBSOLETE_X_SYS_BOOT 0x8017
+# define CMD_OBSOLETE_X_SYS_NICE 0x8018
+# define CMD_OBSOLETE_X_SYS_RESOURCE 0x8019
+# define CMD_OBSOLETE_X_SYS_TIME 0x801a
+# define CMD_OBSOLETE_X_MKNOD 0x801b
+# define CMD_OBSOLETE_X_QUOTACTL 0x801c
+
+static char const * const OBSOLETE_MAPPING[] = {
+ // 0 1 2 3
+ "CHOWN", "DAC_OVERRIDE", "DAC_READ_SEARCH", "FOWNER",
+ "FSETID", "KILL", "SETGID", "SETUID",
+ "SETPCAP", "SYS_TTY_CONFIG", "LEASE", "SYS_CHROOT",
+ "LINUX_IMMUTABLE", "NET_BIND_SERVICE", "NET_BROADCAST", "NET_ADMIN",
+ "NET_RAW", "IPC_LOCK", "IPC_OWNER", "SYS_MODULE",
+ "SYS_RAWIO", "SYS_PACCT", "SYS_ADMIN", "SYS_BOOT",
+ "SYS_NICE", "SYS_RESOURCE", "SYS_TIME", "MKNOD",
+ "QUOTACTL" };
+#endif
+
+struct option const
+CMDLINE_OPTIONS[] = {
+ { "help", no_argument, 0, CMD_HELP },
+ { "version", no_argument, 0, CMD_VERSION },
+ { "cap", required_argument, 0, CMD_CAP },
+ { "flag", required_argument, 0, CMD_FLAG },
+ { "secure", no_argument, 0, CMD_SECURE },
+ { "show", no_argument, 0, CMD_SHOW },
+ { "pid", required_argument, 0, CMD_PID },
+#ifdef VC_ENABLE_API_LEGACY
+ { "CAP_CHOWN", no_argument, 0, CMD_OBSOLETE_CHOWN },
+ { "CAP_DAC_OVERRIDE", no_argument, 0, CMD_OBSOLETE_DAC_OVERRIDE },
+ { "CAP_DAC_READ_SEARCH", no_argument, 0, CMD_OBSOLETE_DAC_READ_SEARCH },
+ { "CAP_FOWNER", no_argument, 0, CMD_OBSOLETE_FOWNER },
+ { "CAP_FSETID", no_argument, 0, CMD_OBSOLETE_FSETID },
+ { "CAP_KILL", no_argument, 0, CMD_OBSOLETE_KILL },
+ { "CAP_SETGID", no_argument, 0, CMD_OBSOLETE_SETGID },
+ { "CAP_SETUID", no_argument, 0, CMD_OBSOLETE_SETUID },
+ { "CAP_SETPCAP", no_argument, 0, CMD_OBSOLETE_SETPCAP },
+ { "CAP_SYS_TTY_CONFIG", no_argument, 0, CMD_OBSOLETE_SYS_TTY_CONFIG },
+ { "CAP_LEASE", no_argument, 0, CMD_OBSOLETE_LEASE },
+ { "CAP_SYS_CHROOT", no_argument, 0, CMD_OBSOLETE_SYS_CHROOT },
+ { "--CAP_LINUX_IMMUTABLE", no_argument, 0, CMD_OBSOLETE_X_LINUX_IMMUTABLE },
+ { "--CAP_NET_BIND_SERVICE", no_argument, 0, CMD_OBSOLETE_X_NET_BIND_SERVICE },
+ { "--CAP_NET_BROADCAST", no_argument, 0, CMD_OBSOLETE_X_NET_BROADCAST },
+ { "--CAP_NET_ADMIN", no_argument, 0, CMD_OBSOLETE_X_NET_ADMIN },
+ { "--CAP_NET_RAW", no_argument, 0, CMD_OBSOLETE_X_NET_RAW },
+ { "--CAP_IPC_LOCK", no_argument, 0, CMD_OBSOLETE_X_IPC_LOCK },
+ { "--CAP_IPC_OWNER", no_argument, 0, CMD_OBSOLETE_X_IPC_OWNER },
+ { "--CAP_SYS_MODULE", no_argument, 0, CMD_OBSOLETE_X_SYS_MODULE },
+ { "--CAP_SYS_RAWIO", no_argument, 0, CMD_OBSOLETE_X_SYS_RAWIO },
+ { "--CAP_SYS_PACCT", no_argument, 0, CMD_OBSOLETE_X_SYS_PACCT },
+ { "--CAP_SYS_ADMIN", no_argument, 0, CMD_OBSOLETE_X_SYS_ADMIN },
+ { "--CAP_SYS_BOOT", no_argument, 0, CMD_OBSOLETE_X_SYS_BOOT },
+ { "--CAP_SYS_NICE", no_argument, 0, CMD_OBSOLETE_X_SYS_NICE },
+ { "--CAP_SYS_RESOURCE", no_argument, 0, CMD_OBSOLETE_X_SYS_RESOURCE },
+ { "--CAP_SYS_TIME", no_argument, 0, CMD_OBSOLETE_X_SYS_TIME },
+ { "--CAP_MKNOD", no_argument, 0, CMD_OBSOLETE_X_MKNOD },
+ { "--CAP_QUOTACTL", no_argument, 0, CMD_OBSOLETE_X_QUOTACTL },
#endif
+ { 0,0,0,0 }
+};
-extern int capget (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
-extern int capset (struct __user_cap_header_struct *, struct __user_cap_data_struct *);
+int wrapper_exit_code = 255;
-static void usage()
+static void
+showHelp(int fd, char const *cmd, int res)
{
- fprintf (stderr,"reducecap version %s\n",VERSION);
- fprintf (stderr,"reducecap [ options ] command argument\n");
- exit (-1);
+ WRITE_MSG(fd, "Usage:\n ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " [--show] [--secure] [--flag <flag>] [--cap <capability>] [--] <cmd> <args>*\n ");
+ WRITE_STR(fd, cmd);
+ WRITE_MSG(fd,
+ " --show [--pid <pid>]\n\n"
+ "Please report bugs to " PACKAGE_BUGREPORT "\n");
+
+ exit(res);
}
-static void reducecap_print(struct __user_cap_data_struct *user)
+static void
+showVersion()
{
- static const char *tb[]={
- "CAP_CHOWN",
- "CAP_DAC_OVERRIDE",
- "CAP_DAC_READ_SEARCH",
- "CAP_FOWNER",
- "CAP_FSETID",
- "CAP_KILL",
- "CAP_SETGID",
- "CAP_SETUID",
- "CAP_SETPCAP",
- "CAP_LINUX_IMMUTABLE",
- "CAP_NET_BIND_SERVICE",
- "CAP_NET_BROADCAST",
- "CAP_NET_ADMIN",
- "CAP_NET_RAW",
- "CAP_IPC_LOCK",
- "CAP_IPC_OWNER",
- "CAP_SYS_MODULE",
- "CAP_SYS_RAWIO",
- "CAP_SYS_CHROOT",
- "CAP_SYS_PTRACE",
- "CAP_SYS_PACCT",
- "CAP_SYS_ADMIN",
- "CAP_SYS_BOOT",
- "CAP_SYS_NICE",
- "CAP_SYS_RESOURCE",
- "CAP_SYS_TIME",
- "CAP_SYS_TTY_CONFIG",
- "CAP_MKNOD",
- "CAP_LEASE",
- "CAP_QUOTACTL",
- NULL
- };
- int i;
- printf ("%22s %9s %9s %9s\n","Capability","Effective","Permitted"
- ,"Inheritable");
- for (i=0; tb[i] != NULL; i++){
- int bit = (1 << i);
- printf ("%22s %9s %9s %9s\n"
- ,tb[i]
- ,(user->effective & bit) ? "X " : " "
- ,(user->permitted & bit) ? "X " : " "
- ,(user->inheritable & bit) ? "X " : " ");
- }
+ WRITE_MSG(1,
+ "reducecap " VERSION " -- starts programs with reduced capabilities\n"
+ "This program is part of " PACKAGE_STRING "\n\n"
+ "Copyright (C) 2003,2004 Enrico Scholz\n"
+ VERSION_COPYRIGHT_DISCLAIMER);
+ exit(0);
}
-static void reducecap_show()
+static void
+printReducecap(struct __user_cap_data_struct *user)
{
- struct __user_cap_header_struct header;
- struct __user_cap_data_struct user;
- header.version = _LINUX_CAPABILITY_VERSION;
- header.pid = getpid();
- if (capget(&header,&user)==-1){
- perror ("capget");
- }else{
- reducecap_print (&user);
- }
+ int i;
+ WRITE_MSG(1, " Capability Effective Permitted Inheritable\n");
+
+ for (i=0;; ++i) {
+ size_t const len = 23 + 10*2 + 4+2;
+ char const * text = vc_cap2text(i);
+ int bit = 1<<i;
+ size_t l;
+ char buf[len];
+ if (text==0) break;
+
+ memset(buf, ' ', sizeof buf);
+ buf[len-1] = '\n';
+ l = MIN(strlen(text), 22);
+ memcpy(buf, text, l);
+ buf[23 + 10*0 + 4] = (user->effective & bit) ? 'X' : ' ';
+ buf[23 + 10*1 + 4] = (user->permitted & bit) ? 'X' : ' ';
+ buf[23 + 10*2 + 4] = (user->inheritable & bit) ? 'X' : ' ';
+ Vwrite(1, buf, len);
+ }
+}
+
+static void
+show(pid_t pid)
+{
+ struct __user_cap_header_struct header;
+ struct __user_cap_data_struct user;
+ header.version = _LINUX_CAPABILITY_VERSION;
+ header.pid = pid;
+ if (capget(&header,&user)==-1){
+ perror ("reducecap: capget()");
+ exit(wrapper_exit_code);
+ }
+
+ printReducecap(&user);
}
+static uint32_t
+getCap(char const *cap)
+{
+ int bit = vc_text2cap(cap);
+ if (bit!=0) {
+ WRITE_MSG(2, "Unknown capability '");
+ WRITE_STR(2, optarg);
+ WRITE_MSG(2, "'; try '--help' for more information\n");
+ exit(wrapper_exit_code);
+ }
+ return (1<<bit);
+}
int main (int argc, char *argv[])
{
- int ret = -1;
- unsigned long remove = 0;
- int show = 0;
- int flags = 0;
- unsigned long secure = (1<<CAP_LINUX_IMMUTABLE)
- |(1<<CAP_NET_BROADCAST)
- |(1<<CAP_NET_ADMIN)
- |(1<<CAP_NET_RAW)
- |(1<<CAP_IPC_LOCK)
- |(1<<CAP_IPC_OWNER)
- |(1<<CAP_SYS_MODULE)
- |(1<<CAP_SYS_RAWIO)
- |(1<<CAP_SYS_PACCT)
- |(1<<CAP_SYS_ADMIN)
- |(1<<CAP_SYS_BOOT)
- |(1<<CAP_SYS_NICE)
- |(1<<CAP_SYS_RESOURCE)
- |(1<<CAP_SYS_TIME)
- |(1<<CAP_MKNOD)
- |(1<<CAP_QUOTACTL);
- int i;
- for (i=1; i<argc; i++){
- const char *arg = argv[i];
- const char *opt = argv[i+1];
- if (strcmp(arg,"--secure")==0){
- remove = secure;
- }else if (strcmp(arg,"--show")==0){
- show = 1;
- }else if (strcmp(arg,"--flag")==0){
- if (strcmp(opt,"lock")==0){
- flags |= 1;
- }else if (strcmp(opt,"sched")==0){
- flags |= 2;
- }else if (strcmp(opt,"nproc")==0){
- flags |= 4;
- }else if (strcmp(opt,"private")==0){
- flags |= 8;
- }else if (strcmp(opt,"hideinfo")==0){
- flags |= 32;
- }else{
- fprintf (stderr,"Unknown flag %s\n",opt);
- }
- i++;
- }else if (arg[0] == '-' && arg[1] == '-'){
- static struct {
- const char *option;
- int bit;
- }tbcap[]={
- // The following capabilities are normally available
- // to vservers administrator, but are place for
- // completeness
- {"CHOWN",CAP_CHOWN},
- {"DAC_OVERRIDE",CAP_DAC_OVERRIDE},
- {"DAC_READ_SEARCH",CAP_DAC_READ_SEARCH},
- {"FOWNER",CAP_FOWNER},
- {"FSETID",CAP_FSETID},
- {"KILL",CAP_KILL},
- {"SETGID",CAP_SETGID},
- {"SETUID",CAP_SETUID},
- {"SETPCAP",CAP_SETPCAP},
- {"SYS_TTY_CONFIG",CAP_SYS_TTY_CONFIG},
- {"LEASE",CAP_LEASE},
- {"SYS_CHROOT",CAP_SYS_CHROOT},
-
- // Those capabilities are not normally available
- // to vservers because they are not needed and
- // may represent a security risk
- {"LINUX_IMMUTABLE",CAP_LINUX_IMMUTABLE},
- {"NET_BIND_SERVICE",CAP_NET_BIND_SERVICE},
- {"NET_BROADCAST",CAP_NET_BROADCAST},
- {"NET_ADMIN", CAP_NET_ADMIN},
- {"NET_RAW", CAP_NET_RAW},
- {"IPC_LOCK", CAP_IPC_LOCK},
- {"IPC_OWNER", CAP_IPC_OWNER},
- {"SYS_MODULE",CAP_SYS_MODULE},
- {"SYS_RAWIO", CAP_SYS_RAWIO},
- {"SYS_PACCT", CAP_SYS_PACCT},
- {"SYS_ADMIN", CAP_SYS_ADMIN},
- {"SYS_BOOT", CAP_SYS_BOOT},
- {"SYS_NICE", CAP_SYS_NICE},
- {"SYS_RESOURCE",CAP_SYS_RESOURCE},
- {"SYS_TIME", CAP_SYS_TIME},
- {"MKNOD", CAP_MKNOD},
- {"QUOTACTL", CAP_QUOTACTL},
- {NULL,0}
- };
- int j;
- arg += 2;
- if (*arg=='\0') {
- ++i;
- break;
- }
- if (strncasecmp(arg, "CAP_", 4)==0) arg += 4;
- for (j=0; tbcap[j].option != NULL; j++){
- if (strcasecmp(tbcap[j].option,arg)==0){
- remove |= (1<<tbcap[j].bit);
- break;
- }
- }
- if (tbcap[j].option == NULL){
- usage();
- }
- }else{
- break;
- }
- }
- if (i == argc){
- if (show){
- reducecap_show();
- }else{
- usage();
- }
- }else{
- struct __user_cap_header_struct header;
- struct __user_cap_data_struct user;
- header.version = _LINUX_CAPABILITY_VERSION;
- header.pid = 0;
- if (capget(&header,&user)==-1){
- perror ("capget");
- }else{
- if (show){
- reducecap_print (&user);
- }
- if (vc_new_s_context(-2,remove,flags)==-1){
- perror ("new_s_context -2");
- }else{
- fprintf (stderr,"Executing\n");
- execvp (argv[i],argv+i);
- fprintf (stderr,"Can't execute command %s\n",argv[i]);
- }
- }
+ uint32_t remove = 0;
+ bool do_show = false;
+ uint32_t flags = 0;
+ pid_t pid = 0;
+#ifdef VC_ENABLE_API_LEGACY
+ bool show_obsolete_warning = true;
+#endif
+
+ while (1) {
+ int c = getopt_long(argc, argv, "+", CMDLINE_OPTIONS, 0);
+ if (c==-1) break;
+
+#ifdef VC_ENABLE_API_LEGACY
+ if (c>=CMD_OBSOLETE_CHOWN && c<=CMD_OBSOLETE_X_QUOTACTL) {
+ if (show_obsolete_warning) {
+ WRITE_MSG(2, "reducecap: warning, obsolete CLI used\n");
+ show_obsolete_warning = false;
+ }
+
+ remove = getCap(OBSOLETE_MAPPING[c-CMD_OBSOLETE_CHOWN]);
+ continue;
+ }
+#endif
+ switch (c) {
+ case CMD_HELP : showHelp(1, argv[0], 0);
+ case CMD_VERSION : showVersion();
+ case CMD_SECURE : remove = vc_get_insecurebcaps(); break;
+ case CMD_SHOW : do_show = true; break;
+ case CMD_PID : pid = atoi(optarg); break;
+ case CMD_CAP : remove = getCap(optarg); break;
+ case CMD_FLAG : {
+ struct vc_err_listparser err;
+
+ flags = vc_list2cflag_compat(optarg, 0, &err);
+ if (err.ptr!=0) {
+ WRITE_MSG(2, "Unknown flag '");
+ Vwrite(2, err.ptr, err.len);
+ WRITE_MSG(2, "'\n");
+ exit(wrapper_exit_code);
}
- return ret;
-}
+ break;
+ }
+ }
+ }
+
+ if (!do_show && optind==argc) {
+ WRITE_MSG(2, "No command given; use '--help' for more information\n");
+ exit(wrapper_exit_code);
+ }
+ if (!do_show && pid!=0) {
+ WRITE_MSG(2, "A pid can be specified in '--show' mode only; use '--help' for more information\n");
+ exit(wrapper_exit_code);
+ }
+
+ if (do_show && optind==argc)
+ show(pid);
+ else {
+ Evc_new_s_context(VC_SAMECTX, remove, flags);
+ if (do_show) show(pid);
+
+ WRITE_MSG(2, "Executing\n");
+ Eexecvp(argv[optind], argv+optind);
+ }
+
+ return EXIT_SUCCESS;
+}
git://git.onelab.eu / util-vserver.git / blobdiff