LXR busybox/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
  31static 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
  54int matchpathcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  55int matchpathcon_main(int argc UNUSED_PARAM, char **argv)
  56{
  57        int error = 0;
  58        unsigned opts;
  59        char *fcontext, *prefix, *path;
  60
  61        opts = getopt32(argv, "^"
  62                        "nNf:p:V"
  63                        "\0"
  64                        "-1" /* at least one param reqd */
  65                        ":?:f--p:p--f" /* mutually exclusive */
  66                        , &fcontext, &prefix
  67        );
  68        argv += optind;
  69
  70        if (opts & OPT_NOT_TRANS) {
  71                set_matchpathcon_flags(MATCHPATHCON_NOTRANS);
  72        }
  73        if (opts & OPT_FCONTEXT) {
  74                if (matchpathcon_init(fcontext))
  75                        bb_perror_msg_and_die("error while processing %s", fcontext);
  76        }
  77        if (opts & OPT_PREFIX) {
  78                if (matchpathcon_init_prefix(NULL, prefix))
  79                        bb_perror_msg_and_die("error while processing %s", prefix);
  80        }
  81
  82        while ((path = *argv++) != NULL) {
  83                security_context_t con;
  84                int rc;
  85
  86                if (!(opts & OPT_VERIFY)) {
  87                        error += print_matchpathcon(path, opts & OPT_NOT_PRINT);
  88                        continue;
  89                }
  90
  91                if (selinux_file_context_verify(path, 0)) {
  92                        printf("%s verified\n", path);
  93                        continue;
  94                }
  95
  96                if (opts & OPT_NOT_TRANS)
  97                        rc = lgetfilecon_raw(path, &con);
  98                else
  99                        rc = lgetfilecon(path, &con);
 100
 101                if (rc >= 0) {
 102                        printf("%s has context %s, should be ", path, con);
 103                        error += print_matchpathcon(path, 1);
 104                        freecon(con);
 105                        continue;
 106                }
 107                printf("actual context unknown: "STRERROR_FMT", should be " STRERROR_ERRNO);
 108                error += print_matchpathcon(path, 1);
 109        }
 110        matchpathcon_fini();
 111        return error;
 112}
 113