selinux/matchpathcon.c

   1 /* matchpathcon  -  get the default security context for the specified
   2  *                  path from the file contexts configuration.
   3  *                  based on libselinux-1.32
   4  * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
   5  *
   6  * Licensed under GPLv2, see file LICENSE in this source tree.
   7  */
   8 //config:config MATCHPATHCON
   9 //config:       bool "matchpathcon (6.1 kb)"
  10 //config:       default n
  11 //config:       depends on SELINUX
  12 //config:       help
  13 //config:       Enable support to get default security context of the
  14 //config:       specified path from the file contexts configuration.
  15
  16 //applet:IF_MATCHPATHCON(APPLET(matchpathcon, BB_DIR_USR_SBIN, BB_SUID_DROP))
  17
  18 //kbuild:lib-$(CONFIG_MATCHPATHCON) += matchpathcon.o
  19
  20 //usage:#define matchpathcon_trivial_usage
  21 //usage:       "[-n] [-N] [-f file_contexts_file] [-p prefix] [-V]"
  22 //usage:#define matchpathcon_full_usage "\n\n"
  23 //usage:       "        -n      Don't display path"
  24 //usage:     "\n        -N      Don't use translations"
  25 //usage:     "\n        -f      Use alternate file_context file"
  26 //usage:     "\n        -p      Use prefix to speed translations"
  27 //usage:     "\n        -V      Verify file context on disk matches defaults"
  28
  29 #include "libbb.h"
  30
  31 static int print_matchpathcon(char *path, int noprint)
  32 {
  33         char *buf;
  34         int rc = matchpathcon(path, 0, &buf);
  35         if (rc < 0) {
  36                 bb_perror_msg("matchpathcon(%s) failed", path);
  37                 return 1;
  38         }
  39         if (!noprint)
  40                 printf("%s\t%s\n", path, buf);
  41         else
  42                 puts(buf);
  43
  44         freecon(buf);
  45         return 0;
  46 }
  47
  48 #define OPT_NOT_PRINT   (1<<0)  /* -n */
  49 #define OPT_NOT_TRANS   (1<<1)  /* -N */
  50 #define OPT_FCONTEXT    (1<<2)  /* -f */
  51 #define OPT_PREFIX      (1<<3)  /* -p */
  52 #define OPT_VERIFY      (1<<4)  /* -V */
  53
  54 int matchpathcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  55 int matchpathcon_main(int argc UNUSED_PARAM, char **argv)
  56 {
  57         int error = 0;
  58         unsigned opts;
  59         char *fcontext, *prefix, *path;
  60
  61         opt_complementary = "-1" /* at least one param reqd */
  62                 ":?:f--p:p--f"; /* mutually exclusive */
  63         opts = getopt32(argv, "nNf:p:V", &fcontext, &prefix);
  64         argv += optind;
  65
  66         if (opts & OPT_NOT_TRANS) {
  67                 set_matchpathcon_flags(MATCHPATHCON_NOTRANS);
  68         }
  69         if (opts & OPT_FCONTEXT) {
  70                 if (matchpathcon_init(fcontext))
  71                         bb_perror_msg_and_die("error while processing %s", fcontext);
  72         }
  73         if (opts & OPT_PREFIX) {
  74                 if (matchpathcon_init_prefix(NULL, prefix))
  75                         bb_perror_msg_and_die("error while processing %s", prefix);
  76         }
  77
  78         while ((path = *argv++) != NULL) {
  79                 security_context_t con;
  80                 int rc;
  81
  82                 if (!(opts & OPT_VERIFY)) {
  83                         error += print_matchpathcon(path, opts & OPT_NOT_PRINT);
  84                         continue;
  85                 }
  86
  87                 if (selinux_file_context_verify(path, 0)) {
  88                         printf("%s verified\n", path);
  89                         continue;
  90                 }
  91
  92                 if (opts & OPT_NOT_TRANS)
  93                         rc = lgetfilecon_raw(path, &con);
  94                 else
  95                         rc = lgetfilecon(path, &con);
  96
  97                 if (rc >= 0) {
  98                         printf("%s has context %s, should be ", path, con);
  99                         error += print_matchpathcon(path, 1);
 100                         freecon(con);
 101                         continue;
 102                 }
 103                 printf("actual context unknown: %s, should be ", strerror(errno));
 104                 error += print_matchpathcon(path, 1);
 105         }
 106         matchpathcon_fini();
 107         return error;
 108 }