Initial public busybox upstream commit
[busybox4maemo] / 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 #include "libbb.h"
8 #include <selinux/context.h>
9
10 context_t set_security_context_component(security_context_t cur_context,
11                                          char *user, char *role, char *type, char *range)
12 {
13         context_t con = context_new(cur_context);
14         if (!con)
15                 return NULL;
16
17         if (user && context_user_set(con, user))
18                 goto error;
19         if (type && context_type_set(con, type))
20                 goto error;
21         if (range && context_range_set(con, range))
22                 goto error;
23         if (role && context_role_set(con, role))
24                 goto error;
25         return con;
26
27 error:
28         context_free(con);
29         return NULL;
30 }
31
32 void setfscreatecon_or_die(security_context_t scontext)
33 {
34         if (setfscreatecon(scontext) < 0) {
35                 /* Can be NULL. All known printf implementations
36                  * display "(null)", "<null>" etc */
37                 bb_perror_msg_and_die("cannot set default "
38                                 "file creation context to %s", scontext);
39         }
40 }
41
42 void selinux_preserve_fcontext(int fdesc)
43 {
44         security_context_t context;
45
46         if (fgetfilecon(fdesc, &context) < 0) {
47                 if (errno == ENODATA || errno == ENOTSUP)
48                         return;
49                 bb_perror_msg_and_die("fgetfilecon failed");
50         }
51         setfscreatecon_or_die(context);
52         freecon(context);
53 }
54