summaryrefslogtreecommitdiff
path: root/selinux/runcon.c (plain)
blob: 366834e46de67637a5de9dbaba7baaf6ea54a589
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#include <selinux/flask.h>
72
73#include "libbb.h"
74
75static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
76 char *command, int compute_trans)
77{
78 context_t con;
79 security_context_t cur_context;
80
81 if (getcon(&cur_context))
82 bb_error_msg_and_die("can't get current context");
83
84 if (compute_trans) {
85 security_context_t file_context, new_context;
86
87 if (getfilecon(command, &file_context) < 0)
88 bb_error_msg_and_die("can't retrieve attributes of '%s'",
89 command);
90 if (security_compute_create(cur_context, file_context,
91 SECCLASS_PROCESS, &new_context))
92 bb_error_msg_and_die("unable to compute a new context");
93 cur_context = new_context;
94 }
95
96 con = context_new(cur_context);
97 if (!con)
98 bb_error_msg_and_die("'%s' is not a valid context", cur_context);
99 if (user && context_user_set(con, user))
100 bb_error_msg_and_die("can't set new user '%s'", user);
101 if (type && context_type_set(con, type))
102 bb_error_msg_and_die("can't set new type '%s'", type);
103 if (range && context_range_set(con, range))
104 bb_error_msg_and_die("can't set new range '%s'", range);
105 if (role && context_role_set(con, role))
106 bb_error_msg_and_die("can't set new role '%s'", role);
107
108 return con;
109}
110
111#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
112static const char runcon_longopts[] ALIGN1 =
113 "user\0" Required_argument "u"
114 "role\0" Required_argument "r"
115 "type\0" Required_argument "t"
116 "range\0" Required_argument "l"
117 "compute\0" No_argument "c"
118 "help\0" No_argument "h"
119 ;
120#endif
121
122#define OPTS_ROLE (1<<0) /* r */
123#define OPTS_TYPE (1<<1) /* t */
124#define OPTS_USER (1<<2) /* u */
125#define OPTS_RANGE (1<<3) /* l */
126#define OPTS_COMPUTE (1<<4) /* c */
127#define OPTS_HELP (1<<5) /* h */
128#define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
129
130int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
131int runcon_main(int argc UNUSED_PARAM, char **argv)
132{
133 char *role = NULL;
134 char *range = NULL;
135 char *user = NULL;
136 char *type = NULL;
137 char *context = NULL;
138 unsigned opts;
139 context_t con;
140
141 selinux_or_die();
142
143#if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
144 applet_long_options = runcon_longopts;
145#endif
146 opt_complementary = "-1";
147 opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range);
148 argv += optind;
149
150 if (!(opts & OPTS_CONTEXT_COMPONENT)) {
151 context = *argv++;
152 if (!argv[0])
153 bb_error_msg_and_die("no command given");
154 }
155
156 if (context) {
157 con = context_new(context);
158 if (!con)
159 bb_error_msg_and_die("'%s' is not a valid context", context);
160 } else {
161 con = runcon_compute_new_context(user, role, type, range,
162 argv[0], opts & OPTS_COMPUTE);
163 }
164
165 if (security_check_context(context_str(con)))
166 bb_error_msg_and_die("'%s' is not a valid context",
167 context_str(con));
168
169 if (setexeccon(context_str(con)))
170 bb_error_msg_and_die("can't set up security context '%s'",
171 context_str(con));
172
173 BB_EXECVP_or_die(argv);
174}
175
generated by cgit at 2024-05-15 03:11:00 (GMT)