Contents of /tags/mkinitrd-6_3_2/busybox/selinux/runcon.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 4114 byte(s)
tagged 'mkinitrd-6_3_2'
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 tarball for details. |
30 | */ |
31 | #include <getopt.h> |
32 | #include <selinux/context.h> |
33 | #include <selinux/flask.h> |
34 | |
35 | #include "libbb.h" |
36 | |
37 | static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range, |
38 | char *command, int compute_trans) |
39 | { |
40 | context_t con; |
41 | security_context_t cur_context; |
42 | |
43 | if (getcon(&cur_context)) |
44 | bb_error_msg_and_die("can't get current context"); |
45 | |
46 | if (compute_trans) { |
47 | security_context_t file_context, new_context; |
48 | |
49 | if (getfilecon(command, &file_context) < 0) |
50 | bb_error_msg_and_die("can't retrieve attributes of '%s'", |
51 | command); |
52 | if (security_compute_create(cur_context, file_context, |
53 | SECCLASS_PROCESS, &new_context)) |
54 | bb_error_msg_and_die("unable to compute a new context"); |
55 | cur_context = new_context; |
56 | } |
57 | |
58 | con = context_new(cur_context); |
59 | if (!con) |
60 | bb_error_msg_and_die("'%s' is not a valid context", cur_context); |
61 | if (user && context_user_set(con, user)) |
62 | bb_error_msg_and_die("can't set new user '%s'", user); |
63 | if (type && context_type_set(con, type)) |
64 | bb_error_msg_and_die("can't set new type '%s'", type); |
65 | if (range && context_range_set(con, range)) |
66 | bb_error_msg_and_die("can't set new range '%s'", range); |
67 | if (role && context_role_set(con, role)) |
68 | bb_error_msg_and_die("can't set new role '%s'", role); |
69 | |
70 | return con; |
71 | } |
72 | |
73 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS |
74 | static const char runcon_longopts[] ALIGN1 = |
75 | "user\0" Required_argument "u" |
76 | "role\0" Required_argument "r" |
77 | "type\0" Required_argument "t" |
78 | "range\0" Required_argument "l" |
79 | "compute\0" No_argument "c" |
80 | "help\0" No_argument "h" |
81 | ; |
82 | #endif |
83 | |
84 | #define OPTS_ROLE (1<<0) /* r */ |
85 | #define OPTS_TYPE (1<<1) /* t */ |
86 | #define OPTS_USER (1<<2) /* u */ |
87 | #define OPTS_RANGE (1<<3) /* l */ |
88 | #define OPTS_COMPUTE (1<<4) /* c */ |
89 | #define OPTS_HELP (1<<5) /* h */ |
90 | #define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE) |
91 | |
92 | int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
93 | int runcon_main(int argc UNUSED_PARAM, char **argv) |
94 | { |
95 | char *role = NULL; |
96 | char *range = NULL; |
97 | char *user = NULL; |
98 | char *type = NULL; |
99 | char *context = NULL; |
100 | unsigned opts; |
101 | context_t con; |
102 | |
103 | selinux_or_die(); |
104 | |
105 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS |
106 | applet_long_options = runcon_longopts; |
107 | #endif |
108 | opt_complementary = "-1"; |
109 | opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range); |
110 | argv += optind; |
111 | |
112 | if (!(opts & OPTS_CONTEXT_COMPONENT)) { |
113 | context = *argv++; |
114 | if (!argv[0]) |
115 | bb_error_msg_and_die("no command given"); |
116 | } |
117 | |
118 | if (context) { |
119 | con = context_new(context); |
120 | if (!con) |
121 | bb_error_msg_and_die("'%s' is not a valid context", context); |
122 | } else { |
123 | con = runcon_compute_new_context(user, role, type, range, |
124 | argv[0], opts & OPTS_COMPUTE); |
125 | } |
126 | |
127 | if (security_check_context(context_str(con))) |
128 | bb_error_msg_and_die("'%s' is not a valid context", |
129 | context_str(con)); |
130 | |
131 | if (setexeccon(context_str(con))) |
132 | bb_error_msg_and_die("can't set up security context '%s'", |
133 | context_str(con)); |
134 | |
135 | execvp(argv[0], argv); |
136 | bb_perror_msg_and_die("can't execute '%s'", argv[0]); |
137 | } |