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path: root/selinux/runcon.c (plain)
blob: 16f17110141d01836fb2bfdf8b43f0ae3b6197c7
1/*
2 * runcon [ context |
3 * ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
4 * command [arg1 [arg2 ...] ]
5 *
6 * attempt to run the specified command with the specified context.
7 *
8 * -r role : use the current context with the specified role
9 * -t type : use the current context with the specified type
10 * -u user : use the current context with the specified user
11 * -l level : use the current context with the specified level range
12 * -c : compute process transition context before modifying
13 *
14 * Contexts are interpreted as follows:
15 *
16 * Number of MLS
17 * components system?
18 *
19 * 1 - type
20 * 2 - role:type
21 * 3 Y role:type:range
22 * 3 N user:role:type
23 * 4 Y user:role:type:range
24 * 4 N error
25 *
26 * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
27 * - based on coreutils-5.97 (in Fedora Core 6)
28 *
29 * Licensed under GPLv2, see file LICENSE in this source tree.
30 */
31//config:config RUNCON
32//config: bool "runcon"
33//config: default n
34//config: depends on SELINUX
35//config: help
36//config: Enable support to run command in specified security context.
37//config:
38//config:config FEATURE_RUNCON_LONG_OPTIONS
39//config: bool "Enable long options"
40//config: default y
41//config: depends on RUNCON && LONG_OPTS
42//config: help
43//config: Support long options for the runcon applet.
44
45//applet:IF_RUNCON(APPLET(runcon, BB_DIR_USR_BIN, BB_SUID_DROP))
46
47//kbuild:lib-$(CONFIG_RUNCON) += runcon.o
48
49//usage:#define runcon_trivial_usage
50//usage: "[-c] [-u USER] [-r ROLE] [-t TYPE] [-l RANGE] PROG ARGS\n"
51//usage: "runcon CONTEXT PROG ARGS"
52//usage:#define runcon_full_usage "\n\n"
53//usage: "Run PROG in a different security context\n"
54//usage: "\n CONTEXT Complete security context\n"
55//usage: IF_FEATURE_RUNCON_LONG_OPTIONS(
56//usage: "\n -c,--compute Compute process transition context before modifying"
57//usage: "\n -t,--type=TYPE Type (for same role as parent)"
58//usage: "\n -u,--user=USER User identity"
59//usage: "\n -r,--role=ROLE Role"
60//usage: "\n -l,--range=RNG Levelrange"
61//usage: )
62//usage: IF_NOT_FEATURE_RUNCON_LONG_OPTIONS(
63//usage: "\n -c Compute process transition context before modifying"
64//usage: "\n -t TYPE Type (for same role as parent)"
65//usage: "\n -u USER User identity"
66//usage: "\n -r ROLE Role"
67//usage: "\n -l RNG Levelrange"
68//usage: )
69
70#include <selinux/context.h>
71/* from deprecated <selinux/flask.h>: */
72#undef SECCLASS_PROCESS
73#define SECCLASS_PROCESS 2
74
75#include "libbb.h"
76
77static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
78 char *command, int compute_trans)
79{
80 context_t con;
81 security_context_t cur_context;
82
83 if (getcon(&cur_context))
84 bb_error_msg_and_die("can't get current context");
85
86 if (compute_trans) {
87 security_context_t file_context, new_context;
88
89 if (getfilecon(command, &file_context) < 0)
90 bb_error_msg_and_die("can't retrieve attributes of '%s'",
91 command);
92 if (security_compute_create(cur_context, file_context,
93 SECCLASS_PROCESS, &new_context))
94 bb_error_msg_and_die("unable to compute a new context");
95 cur_context = new_context;
96 }
97
98 con = context_new(cur_context);
99 if (!con)
100 bb_error_msg_and_die("'%s' is not a valid context", cur_context);
101 if (user && context_user_set(con, user))
102 bb_error_msg_and_die("can't set new user '%s'", user);
103 if (type && context_type_set(con, type))
104 bb_error_msg_and_die("can't set new type '%s'", type);
105 if (range && context_range_set(con, range))
106 bb_error_msg_and_die("can't set new range '%s'", range);
107 if (role && context_role_set(con, role))
108 bb_error_msg_and_die("can't set new role '%s'", role);
109
110 return con;
111}
112
113#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
114static const char runcon_longopts[] ALIGN1 =
115 "user\0" Required_argument "u"
116 "role\0" Required_argument "r"
117 "type\0" Required_argument "t"
118 "range\0" Required_argument "l"
119 "compute\0" No_argument "c"
120 "help\0" No_argument "h"
121 ;
122#endif
123
124#define OPTS_ROLE (1<<0) /* r */
125#define OPTS_TYPE (1<<1) /* t */
126#define OPTS_USER (1<<2) /* u */
127#define OPTS_RANGE (1<<3) /* l */
128#define OPTS_COMPUTE (1<<4) /* c */
129#define OPTS_HELP (1<<5) /* h */
130#define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
131
132int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
133int runcon_main(int argc UNUSED_PARAM, char **argv)
134{
135 char *role = NULL;
136 char *range = NULL;
137 char *user = NULL;
138 char *type = NULL;
139 char *context = NULL;
140 unsigned opts;
141 context_t con;
142
143 selinux_or_die();
144
145#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
146 applet_long_options = runcon_longopts;
147#endif
148 opt_complementary = "-1";
149 opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range);
150 argv += optind;
151
152 if (!(opts & OPTS_CONTEXT_COMPONENT)) {
153 context = *argv++;
154 if (!argv[0])
155 bb_error_msg_and_die("no command given");
156 }
157
158 if (context) {
159 con = context_new(context);
160 if (!con)
161 bb_error_msg_and_die("'%s' is not a valid context", context);
162 } else {
163 con = runcon_compute_new_context(user, role, type, range,
164 argv[0], opts & OPTS_COMPUTE);
165 }
166
167 if (security_check_context(context_str(con)))
168 bb_error_msg_and_die("'%s' is not a valid context",
169 context_str(con));
170
171 if (setexeccon(context_str(con)))
172 bb_error_msg_and_die("can't set up security context '%s'",
173 context_str(con));
174
175 BB_EXECVP_or_die(argv);
176}
177
generated by cgit at 2024-05-15 07:44:52 (GMT)