release/src/router/busybox/libbb/selinux_common.c

   1 /*
   2  * libbb/selinux_common.c
   3  *   -- common SELinux utility functions
   4  *
   5  * Copyright 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
   6  *
   7  * Licensed under GPLv2, see file LICENSE in this source tree.
   8  */
   9 #include "libbb.h"
  10 #include <selinux/context.h>
  11
  12 context_t FAST_FUNC set_security_context_component(security_context_t cur_context,
  13                         char *user, char *role, char *type, char *range)
  14 {
  15         context_t con = context_new(cur_context);
  16         if (!con)
  17                 return NULL;
  18
  19         if (user && context_user_set(con, user))
  20                 goto error;
  21         if (type && context_type_set(con, type))
  22                 goto error;
  23         if (range && context_range_set(con, range))
  24                 goto error;
  25         if (role && context_role_set(con, role))
  26                 goto error;
  27         return con;
  28
  29 error:
  30         context_free(con);
  31         return NULL;
  32 }
  33
  34 void FAST_FUNC setfscreatecon_or_die(security_context_t scontext)
  35 {
  36         if (setfscreatecon(scontext) < 0) {
  37                 /* Can be NULL. All known printf implementations
  38                  * display "(null)", "<null>" etc */
  39                 bb_perror_msg_and_die("can't set default "
  40                                 "file creation context to %s", scontext);
  41         }
  42 }
  43
  44 void FAST_FUNC selinux_preserve_fcontext(int fdesc)
  45 {
  46         security_context_t context;
  47
  48         if (fgetfilecon(fdesc, &context) < 0) {
  49                 if (errno == ENODATA || errno == ENOTSUP)
  50                         return;
  51                 bb_perror_msg_and_die("fgetfilecon failed");
  52         }
  53         setfscreatecon_or_die(context);
  54         freecon(context);
  55 }