2 * chcon -- change security context, based on coreutils-5.97-13
4 * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
6 * Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
8 * Licensed under GPLv2, see file LICENSE in this source tree.
11 //config: bool "chcon (8.9 kb)"
13 //config: depends on SELINUX
15 //config: Enable support to change the security context of file.
17 //applet:IF_CHCON(APPLET(chcon, BB_DIR_USR_BIN, BB_SUID_DROP))
19 //kbuild:lib-$(CONFIG_CHCON) += chcon.o
21 //usage:#define chcon_trivial_usage
22 //usage: "[OPTIONS] CONTEXT FILE..."
23 //usage: "\n chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
24 //usage: IF_LONG_OPTS(
25 //usage: "\n chcon [OPTIONS] --reference=RFILE FILE..."
28 //usage:#define chcon_full_usage "\n\n"
29 //usage: "Change the security context of each FILE to CONTEXT\n"
30 //usage: "\n -v Verbose"
31 //usage: "\n -c Report changes made"
32 //usage: "\n -h Affect symlinks instead of their targets"
33 //usage: "\n -f Suppress most error messages"
34 //usage: IF_LONG_OPTS(
35 //usage: "\n --reference RFILE Use RFILE's group instead of using a CONTEXT value"
37 //usage: "\n -u USER Set user/role/type/range in the target security context"
41 //usage: "\n -R Recurse"
43 #include <selinux/context.h>
47 #define OPT_RECURSIVE (1<<0) /* 'R' */
48 #define OPT_CHANHES (1<<1) /* 'c' */
49 #define OPT_NODEREFERENCE (1<<2) /* 'h' */
50 #define OPT_QUIET (1<<3) /* 'f' */
51 #define OPT_USER (1<<4) /* 'u' */
52 #define OPT_ROLE (1<<5) /* 'r' */
53 #define OPT_TYPE (1<<6) /* 't' */
54 #define OPT_RANGE (1<<7) /* 'l' */
55 #define OPT_VERBOSE (1<<8) /* 'v' */
56 #define OPT_REFERENCE ((1<<9) * ENABLE_LONG_OPTS)
57 #define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
59 static char *user = NULL;
60 static char *role = NULL;
61 static char *type = NULL;
62 static char *range = NULL;
63 static char *specified_context = NULL;
65 static int FAST_FUNC change_filedir_context(
67 struct stat *stbuf UNUSED_PARAM,
68 void *userData UNUSED_PARAM,
69 int depth UNUSED_PARAM)
71 context_t context = NULL;
72 security_context_t file_context = NULL;
73 security_context_t context_string;
77 if (option_mask32 & OPT_NODEREFERENCE) {
78 status = lgetfilecon(fname, &file_context);
80 status = getfilecon(fname, &file_context);
82 if (status < 0 && errno != ENODATA) {
83 if ((option_mask32 & OPT_QUIET) == 0)
84 bb_error_msg("can't obtain security context: %s", fname);
88 if (file_context == NULL && specified_context == NULL) {
89 bb_error_msg("can't apply partial context to unlabeled file %s", fname);
93 if (specified_context == NULL) {
94 context = set_security_context_component(file_context,
95 user, role, type, range);
97 bb_error_msg("can't compute security context from %s", file_context);
101 context = context_new(specified_context);
103 bb_error_msg("invalid context: %s", specified_context);
108 context_string = context_str(context);
109 if (!context_string) {
110 bb_error_msg("can't obtain security context in text expression");
114 if (file_context == NULL || strcmp(context_string, file_context) != 0) {
117 if (option_mask32 & OPT_NODEREFERENCE) {
118 fail = lsetfilecon(fname, context_string);
120 fail = setfilecon(fname, context_string);
122 if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
124 ? "context of %s changed to %s\n"
125 : "can't change context of %s to %s\n",
126 fname, context_string);
130 } else if ((option_mask32 & OPT_QUIET) == 0) {
131 bb_error_msg("can't change context of %s to %s",
132 fname, context_string);
135 if (option_mask32 & OPT_VERBOSE) {
136 printf("context of %s retained as %s\n", fname, context_string);
141 context_free(context);
142 freecon(file_context);
148 static const char chcon_longopts[] ALIGN1 =
149 "recursive\0" No_argument "R"
150 "changes\0" No_argument "c"
151 "no-dereference\0" No_argument "h"
152 "silent\0" No_argument "f"
153 "quiet\0" No_argument "f"
154 "user\0" Required_argument "u"
155 "role\0" Required_argument "r"
156 "type\0" Required_argument "t"
157 "range\0" Required_argument "l"
158 "verbose\0" No_argument "v"
159 "reference\0" Required_argument "\xff" /* no short option */
163 int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
164 int chcon_main(int argc UNUSED_PARAM, char **argv)
166 char *reference_file;
170 getopt32long(argv, "^"
173 "-1" /* at least 1 arg */
174 ":?" /* error if exclusivity constraints are violated */
176 ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
178 ":f--v:v--f" /* 'verbose' and 'quiet' are exclusive */
180 &user, &role, &type, &range, &reference_file
185 if (option_mask32 & OPT_REFERENCE) {
186 /* FIXME: lgetfilecon() should be used when '-h' is specified.
187 * But current implementation follows the original one. */
188 if (getfilecon(reference_file, &specified_context) < 0)
189 bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
192 if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
193 specified_context = *argv++;
194 /* specified_context is never NULL -
195 * "-1" in opt_complementary prevents this. */
197 bb_error_msg_and_die("too few arguments");
200 for (i = 0; (fname = argv[i]) != NULL; i++) {
201 int fname_len = strlen(fname);
202 while (fname_len > 1 && fname[fname_len - 1] == '/')
204 fname[fname_len] = '\0';
206 if (recursive_action(fname,
207 ((option_mask32 & OPT_RECURSIVE) ? ACTION_RECURSIVE : 0),
208 change_filedir_context,
209 change_filedir_context,