1 /*
2 * chcon -- change security context, based on coreutils-5.97-13
3 *
4 * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
5 *
6 * Copyright (C) 2006 - 2007 KaiGai Kohei <kaigai@kaigai.gr.jp>
7 *
8 * Licensed under GPLv2, see file LICENSE in this source tree.
9 */
10 //config:config CHCON
11 //config: bool "chcon (8.9 kb)"
12 //config: default n
13 //config: depends on SELINUX
14 //config: help
15 //config: Enable support to change the security context of file.
16
17 //applet:IF_CHCON(APPLET(chcon, BB_DIR_USR_BIN, BB_SUID_DROP))
18
19 //kbuild:lib-$(CONFIG_CHCON) += chcon.o
20
21 //usage:#define chcon_trivial_usage
22 //usage: "[-chfRv] CONTEXT FILE..."
23 //usage: "\n chcon [-chfRv] [-u USER] [-r ROLE] [-l RANGE] [-t TYPE] FILE..."
24 //usage: IF_LONG_OPTS(
25 //usage: "\n chcon [-chfRv] --reference=RFILE FILE..."
26 //usage: )
27 //usage:
28 //usage:#define chcon_full_usage "\n\n"
29 //usage: "Change the security context of FILEs 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"
36 //usage: )
37 //usage: "\n -u USER Set user/role/type/range in the target security context"
38 //usage: "\n -r ROLE"
39 //usage: "\n -t TYPE"
40 //usage: "\n -l RANGE"
41 //usage: "\n -R Recurse"
42
43 #include <selinux/context.h>
44
45 #include "libbb.h"
46
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)
58
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;
64
change_filedir_context(struct recursive_state * state UNUSED_PARAM,const char * fname,struct stat * stbuf UNUSED_PARAM)65 static int FAST_FUNC change_filedir_context(struct recursive_state *state UNUSED_PARAM,
66 const char *fname,
67 struct stat *stbuf UNUSED_PARAM)
68 {
69 context_t context = NULL;
70 security_context_t file_context = NULL;
71 security_context_t context_string;
72 int rc = FALSE;
73 int status = 0;
74
75 if (option_mask32 & OPT_NODEREFERENCE) {
76 status = lgetfilecon(fname, &file_context);
77 } else {
78 status = getfilecon(fname, &file_context);
79 }
80 if (status < 0 && errno != ENODATA) {
81 if ((option_mask32 & OPT_QUIET) == 0)
82 bb_error_msg("can't obtain security context: %s", fname);
83 goto skip;
84 }
85
86 if (file_context == NULL && specified_context == NULL) {
87 bb_error_msg("can't apply partial context to unlabeled file %s", fname);
88 goto skip;
89 }
90
91 if (specified_context == NULL) {
92 context = set_security_context_component(file_context,
93 user, role, type, range);
94 if (!context) {
95 bb_error_msg("can't compute security context from %s", file_context);
96 goto skip;
97 }
98 } else {
99 context = context_new(specified_context);
100 if (!context) {
101 bb_error_msg("invalid context: %s", specified_context);
102 goto skip;
103 }
104 }
105
106 context_string = context_str(context);
107 if (!context_string) {
108 bb_simple_error_msg("can't obtain security context in text expression");
109 goto skip;
110 }
111
112 if (file_context == NULL || strcmp(context_string, file_context) != 0) {
113 int fail;
114
115 if (option_mask32 & OPT_NODEREFERENCE) {
116 fail = lsetfilecon(fname, context_string);
117 } else {
118 fail = setfilecon(fname, context_string);
119 }
120 if ((option_mask32 & OPT_VERBOSE) || ((option_mask32 & OPT_CHANHES) && !fail)) {
121 printf(!fail
122 ? "context of %s changed to %s\n"
123 : "can't change context of %s to %s\n",
124 fname, context_string);
125 }
126 if (!fail) {
127 rc = TRUE;
128 } else if ((option_mask32 & OPT_QUIET) == 0) {
129 bb_error_msg("can't change context of %s to %s",
130 fname, context_string);
131 }
132 } else {
133 if (option_mask32 & OPT_VERBOSE) {
134 printf("context of %s retained as %s\n", fname, context_string);
135 }
136 rc = TRUE;
137 }
138 skip:
139 context_free(context);
140 freecon(file_context);
141
142 return rc;
143 }
144
145 #if ENABLE_LONG_OPTS
146 static const char chcon_longopts[] ALIGN1 =
147 "recursive\0" No_argument "R"
148 "changes\0" No_argument "c"
149 "no-dereference\0" No_argument "h"
150 "silent\0" No_argument "f"
151 "quiet\0" No_argument "f"
152 "user\0" Required_argument "u"
153 "role\0" Required_argument "r"
154 "type\0" Required_argument "t"
155 "range\0" Required_argument "l"
156 "verbose\0" No_argument "v"
157 "reference\0" Required_argument "\xff" /* no short option */
158 ;
159 #endif
160
161 int chcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
chcon_main(int argc UNUSED_PARAM,char ** argv)162 int chcon_main(int argc UNUSED_PARAM, char **argv)
163 {
164 char *reference_file;
165 char *fname;
166 int i, errors = 0;
167
168 getopt32long(argv, "^"
169 "Rchfu:r:t:l:v"
170 "\0"
171 "-1" /* at least 1 arg */
172 ":?" /* error if exclusivity constraints are violated */
173 #if ENABLE_LONG_OPTS
174 ":\xff--urtl:u--\xff:r--\xff:t--\xff:l--\xff"
175 #endif
176 ":f--v:v--f" /* 'verbose' and 'quiet' are exclusive */
177 , chcon_longopts,
178 &user, &role, &type, &range, &reference_file
179 );
180 argv += optind;
181
182 #if ENABLE_LONG_OPTS
183 if (option_mask32 & OPT_REFERENCE) {
184 /* FIXME: lgetfilecon() should be used when '-h' is specified.
185 * But current implementation follows the original one. */
186 if (getfilecon(reference_file, &specified_context) < 0)
187 bb_perror_msg_and_die("getfilecon('%s') failed", reference_file);
188 } else
189 #endif
190 if ((option_mask32 & OPT_COMPONENT_SPECIFIED) == 0) {
191 specified_context = *argv++;
192 /* specified_context is never NULL -
193 * "-1" in opt_complementary prevents this. */
194 if (!argv[0])
195 bb_simple_error_msg_and_die("too few arguments");
196 }
197
198 for (i = 0; (fname = argv[i]) != NULL; i++) {
199 int fname_len = strlen(fname);
200 while (fname_len > 1 && fname[fname_len - 1] == '/')
201 fname_len--;
202 fname[fname_len] = '\0';
203
204 if (recursive_action(fname,
205 ((option_mask32 & OPT_RECURSIVE) ? ACTION_RECURSE : 0),
206 change_filedir_context,
207 change_filedir_context,
208 NULL) != TRUE)
209 errors = 1;
210 }
211 return errors;
212 }
213