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 //config:config FEATURE_CHCON_LONG_OPTIONS
18 //config: bool "Enable long options"
20 //config: depends on CHCON && LONG_OPTS
22 //applet:IF_CHCON(APPLET(chcon, BB_DIR_USR_BIN, BB_SUID_DROP))
24 //kbuild:lib-$(CONFIG_CHCON) += chcon.o
26 //usage:#define chcon_trivial_usage
27 //usage: "[OPTIONS] CONTEXT FILE..."
28 //usage: "\n chcon [OPTIONS] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
29 //usage: IF_FEATURE_CHCON_LONG_OPTIONS(
30 //usage: "\n chcon [OPTIONS] --reference=RFILE FILE..."
32 //usage:#define chcon_full_usage "\n\n"
33 //usage: "Change the security context of each FILE to CONTEXT\n"
34 //usage: IF_FEATURE_CHCON_LONG_OPTIONS(
35 //usage: "\n -v,--verbose Verbose"
36 //usage: "\n -c,--changes Report changes made"
37 //usage: "\n -h,--no-dereference Affect symlinks instead of their targets"
38 //usage: "\n -f,--silent,--quiet Suppress most error messages"
39 //usage: "\n --reference RFILE Use RFILE's group instead of using a CONTEXT value"
40 //usage: "\n -u,--user USER Set user/role/type/range in the target"
41 //usage: "\n -r,--role ROLE security context"
42 //usage: "\n -t,--type TYPE"
43 //usage: "\n -l,--range RANGE"
44 //usage: "\n -R,--recursive Recurse"
46 //usage: IF_NOT_FEATURE_CHCON_LONG_OPTIONS(
47 //usage: "\n -v Verbose"
48 //usage: "\n -c Report changes made"
49 //usage: "\n -h Affect symlinks instead of their targets"
50 //usage: "\n -f Suppress most error messages"
51 //usage: "\n -u USER Set user/role/type/range in the target security context"
55 //usage: "\n -R Recurse"
58 #include <selinux/context.h>
62 #define OPT_RECURSIVE (1<<0) /* 'R' */
63 #define OPT_CHANHES (1<<1) /* 'c' */
64 #define OPT_NODEREFERENCE (1<<2) /* 'h' */
65 #define OPT_QUIET (1<<3) /* 'f' */
66 #define OPT_USER (1<<4) /* 'u' */
67 #define OPT_ROLE (1<<5) /* 'r' */
68 #define OPT_TYPE (1<<6) /* 't' */
69 #define OPT_RANGE (1<<7) /* 'l' */
70 #define OPT_VERBOSE (1<<8) /* 'v' */
71 #define OPT_REFERENCE ((1<<9) * ENABLE_FEATURE_CHCON_LONG_OPTIONS)
72 #define OPT_COMPONENT_SPECIFIED (OPT_USER | OPT_ROLE | OPT_TYPE | OPT_RANGE)
74 static char *user = NULL;
75 static char *role = NULL;
76 static char *type = NULL;
77 static char *range = NULL;
78 static char *specified_context = NULL;
80 static int FAST_FUNC change_filedir_context(
82 struct stat *stbuf UNUSED_PARAM,
83 void *userData UNUSED_PARAM,
84 int depth UNUSED_PARAM)
86 context_t context = NULL;
87 security_context_t file_context = NULL;
88 security_context_t context_string;
92 if (option_mask32 & OPT_NODEREFERENCE) {
93 status = lgetfilecon(fname, &file_context);
95 status = getfilecon(fname, &file_context);
97 if (status < 0 && errno != ENODATA) {
98 if ((option_mask32 & OPT_QUIET) == 0)
99 bb_error_msg("can't obtain security context: %s", fname);
103 if (file_context == NULL && specified_context == NULL) {
104 bb_error_msg("can't apply partial context to unlabeled file %s", fname);
108 if (specified_context == NULL) {
109 context = set_security_context_component(file_context,
110 user, role, type, range);
112 bb_error_msg("can't compute security context from %s", file_context);
116 context = context_new(specified_context);
118 bb_error_msg("invalid context: %s", specified_context);
123 context_string = context_str(context);
124 if (!context_string) {
125 bb_error_msg("can't obtain security context in text expression");
129 if (file_context == NULL || strcmp(context_string, file_context) != 0) {
132 if (option_mask32 & OPT_NODEREFERENCE) {
133 fail = lsetfilecon(fname, context_string);
135 fail = setfilecon(fname, context_string);
137 if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
139 ? "context of %s changed to %s\n"
140 : "can't change context of %s to %s\n",
141 fname, context_string);
145 } else if ((option_mask32 & OPT_QUIET) == 0) {
146 bb_error_msg("can't change context of %s to %s",
147 fname, context_string);
149 } else if (option_mask32 & OPT_VERBOSE) {
150 printf("context of %s retained as %s\n", fname, context_string);
154 context_free(context);
155 freecon(file_context);
160 #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
161 static const char chcon_longopts[] ALIGN1 =
162 "recursive\0" No_argument "R"
163 "changes\0" No_argument "c"
164 "no-dereference\0" No_argument "h"
165 "silent\0" No_argument "f"
166 "quiet\0" No_argument "f"
167 "user\0" Required_argument "u"
168 "role\0" Required_argument "r"
169 "type\0" Required_argument "t"
170 "range\0" Required_argument "l"
171 "verbose\0" No_argument "v"
172 "reference\0" Required_argument "\xff" /* no short option */
176 int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
177 int chcon_main(int argc UNUSED_PARAM, char **argv)
179 char *reference_file;
183 #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
184 applet_long_options = chcon_longopts;
186 opt_complementary = "-1" /* at least 1 param */
187 ":?" /* error if exclusivity constraints are violated */
188 #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
189 ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
191 ":f--v:v--f"; /* 'verbose' and 'quiet' are exclusive */
192 getopt32(argv, "Rchfu:r:t:l:v",
193 &user, &role, &type, &range, &reference_file);
196 #if ENABLE_FEATURE_CHCON_LONG_OPTIONS
197 if (option_mask32 & OPT_REFERENCE) {
198 /* FIXME: lgetfilecon() should be used when '-h' is specified.
199 * But current implementation follows the original one. */
200 if (getfilecon(reference_file, &specified_context) < 0)
201 bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
204 if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
205 specified_context = *argv++;
206 /* specified_context is never NULL -
207 * "-1" in opt_complementary prevents this. */
209 bb_error_msg_and_die("too few arguments");
212 for (i = 0; (fname = argv[i]) != NULL; i++) {
213 int fname_len = strlen(fname);
214 while (fname_len > 1 && fname[fname_len - 1] == '/')
216 fname[fname_len] = '\0';
218 if (recursive_action(fname,
219 1<<option_mask32 & OPT_RECURSIVE,
220 change_filedir_context,
221 change_filedir_context,