Contents of /trunk/mkinitrd-magellan/busybox/selinux/runcon.c
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 4061 byte(s)
-updated to busybox-1.13.4
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 | #include <getopt.h> |
30 | #include <selinux/context.h> |
31 | #include <selinux/flask.h> |
32 | |
33 | #include "libbb.h" |
34 | |
35 | static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range, |
36 | char *command, int compute_trans) |
37 | { |
38 | context_t con; |
39 | security_context_t cur_context; |
40 | |
41 | if (getcon(&cur_context)) |
42 | bb_error_msg_and_die("cannot get current context"); |
43 | |
44 | if (compute_trans) { |
45 | security_context_t file_context, new_context; |
46 | |
47 | if (getfilecon(command, &file_context) < 0) |
48 | bb_error_msg_and_die("cannot retrieve attributes of '%s'", |
49 | command); |
50 | if (security_compute_create(cur_context, file_context, |
51 | SECCLASS_PROCESS, &new_context)) |
52 | bb_error_msg_and_die("unable to compute a new context"); |
53 | cur_context = new_context; |
54 | } |
55 | |
56 | con = context_new(cur_context); |
57 | if (!con) |
58 | bb_error_msg_and_die("'%s' is not a valid context", cur_context); |
59 | if (user && context_user_set(con, user)) |
60 | bb_error_msg_and_die("failed to set new user '%s'", user); |
61 | if (type && context_type_set(con, type)) |
62 | bb_error_msg_and_die("failed to set new type '%s'", type); |
63 | if (range && context_range_set(con, range)) |
64 | bb_error_msg_and_die("failed to set new range '%s'", range); |
65 | if (role && context_role_set(con, role)) |
66 | bb_error_msg_and_die("failed to set new role '%s'", role); |
67 | |
68 | return con; |
69 | } |
70 | |
71 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS |
72 | static const char runcon_longopts[] ALIGN1 = |
73 | "user\0" Required_argument "u" |
74 | "role\0" Required_argument "r" |
75 | "type\0" Required_argument "t" |
76 | "range\0" Required_argument "l" |
77 | "compute\0" No_argument "c" |
78 | "help\0" No_argument "h" |
79 | ; |
80 | #endif |
81 | |
82 | #define OPTS_ROLE (1<<0) /* r */ |
83 | #define OPTS_TYPE (1<<1) /* t */ |
84 | #define OPTS_USER (1<<2) /* u */ |
85 | #define OPTS_RANGE (1<<3) /* l */ |
86 | #define OPTS_COMPUTE (1<<4) /* c */ |
87 | #define OPTS_HELP (1<<5) /* h */ |
88 | #define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE) |
89 | |
90 | int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
91 | int runcon_main(int argc UNUSED_PARAM, char **argv) |
92 | { |
93 | char *role = NULL; |
94 | char *range = NULL; |
95 | char *user = NULL; |
96 | char *type = NULL; |
97 | char *context = NULL; |
98 | unsigned opts; |
99 | context_t con; |
100 | |
101 | selinux_or_die(); |
102 | |
103 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS |
104 | applet_long_options = runcon_longopts; |
105 | #endif |
106 | opt_complementary = "-1"; |
107 | opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range); |
108 | argv += optind; |
109 | |
110 | if (!(opts & OPTS_CONTEXT_COMPONENT)) { |
111 | context = *argv++; |
112 | if (!argv[0]) |
113 | bb_error_msg_and_die("no command given"); |
114 | } |
115 | |
116 | if (context) { |
117 | con = context_new(context); |
118 | if (!con) |
119 | bb_error_msg_and_die("'%s' is not a valid context", context); |
120 | } else { |
121 | con = runcon_compute_new_context(user, role, type, range, |
122 | argv[0], opts & OPTS_COMPUTE); |
123 | } |
124 | |
125 | if (security_check_context(context_str(con))) |
126 | bb_error_msg_and_die("'%s' is not a valid context", |
127 | context_str(con)); |
128 | |
129 | if (setexeccon(context_str(con))) |
130 | bb_error_msg_and_die("cannot set up security context '%s'", |
131 | context_str(con)); |
132 | |
133 | execvp(argv[0], argv); |
134 | |
135 | bb_perror_msg_and_die("cannot execute '%s'", argv[0]); |
136 | } |