| 1 | /*
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| 2 | * runcon [ context |
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| 3 | * ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
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| 4 | * command [arg1 [arg2 ...] ]
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| 5 | *
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| 6 | * attempt to run the specified command with the specified context.
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| 7 | *
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| 8 | * -r role : use the current context with the specified role
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| 9 | * -t type : use the current context with the specified type
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| 10 | * -u user : use the current context with the specified user
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| 11 | * -l level : use the current context with the specified level range
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| 12 | * -c : compute process transition context before modifying
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| 13 | *
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| 14 | * Contexts are interpreted as follows:
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| 15 | *
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| 16 | * Number of MLS
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| 17 | * components system?
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| 18 | *
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| 19 | * 1 - type
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| 20 | * 2 - role:type
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| 21 | * 3 Y role:type:range
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| 22 | * 3 N user:role:type
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| 23 | * 4 Y user:role:type:range
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| 24 | * 4 N error
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| 25 | *
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| 26 | * Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
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| 27 | * - based on coreutils-5.97 (in Fedora Core 6)
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| 28 | *
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| 29 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 30 | */
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| 31 | #include <getopt.h>
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| 32 | #include <selinux/context.h>
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| 33 | #include <selinux/flask.h>
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| 34 |
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| 35 | #include "libbb.h"
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| 36 |
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| 37 | static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
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| 38 | char *command, int compute_trans)
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| 39 | {
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| 40 | context_t con;
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| 41 | security_context_t cur_context;
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| 42 |
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| 43 | if (getcon(&cur_context))
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| 44 | bb_error_msg_and_die("can't get current context");
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| 45 |
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| 46 | if (compute_trans) {
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| 47 | security_context_t file_context, new_context;
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| 48 |
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| 49 | if (getfilecon(command, &file_context) < 0)
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| 50 | bb_error_msg_and_die("can't retrieve attributes of '%s'",
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| 51 | command);
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| 52 | if (security_compute_create(cur_context, file_context,
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| 53 | SECCLASS_PROCESS, &new_context))
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| 54 | bb_error_msg_and_die("unable to compute a new context");
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| 55 | cur_context = new_context;
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| 56 | }
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| 57 |
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| 58 | con = context_new(cur_context);
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| 59 | if (!con)
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| 60 | bb_error_msg_and_die("'%s' is not a valid context", cur_context);
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| 61 | if (user && context_user_set(con, user))
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| 62 | bb_error_msg_and_die("can't set new user '%s'", user);
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| 63 | if (type && context_type_set(con, type))
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| 64 | bb_error_msg_and_die("can't set new type '%s'", type);
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| 65 | if (range && context_range_set(con, range))
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| 66 | bb_error_msg_and_die("can't set new range '%s'", range);
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| 67 | if (role && context_role_set(con, role))
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| 68 | bb_error_msg_and_die("can't set new role '%s'", role);
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| 69 |
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| 70 | return con;
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| 71 | }
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| 72 |
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| 73 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
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| 74 | static const char runcon_longopts[] ALIGN1 =
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| 75 | "user\0" Required_argument "u"
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| 76 | "role\0" Required_argument "r"
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| 77 | "type\0" Required_argument "t"
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| 78 | "range\0" Required_argument "l"
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| 79 | "compute\0" No_argument "c"
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| 80 | "help\0" No_argument "h"
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| 81 | ;
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| 82 | #endif
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| 83 |
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| 84 | #define OPTS_ROLE (1<<0) /* r */
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| 85 | #define OPTS_TYPE (1<<1) /* t */
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| 86 | #define OPTS_USER (1<<2) /* u */
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| 87 | #define OPTS_RANGE (1<<3) /* l */
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| 88 | #define OPTS_COMPUTE (1<<4) /* c */
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| 89 | #define OPTS_HELP (1<<5) /* h */
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| 90 | #define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
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| 91 |
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| 92 | int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 93 | int runcon_main(int argc UNUSED_PARAM, char **argv)
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| 94 | {
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| 95 | char *role = NULL;
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| 96 | char *range = NULL;
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| 97 | char *user = NULL;
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| 98 | char *type = NULL;
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| 99 | char *context = NULL;
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| 100 | unsigned opts;
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| 101 | context_t con;
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| 102 |
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| 103 | selinux_or_die();
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| 104 |
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| 105 | #if ENABLE_FEATURE_RUNCON_LONG_OPTIONS
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| 106 | applet_long_options = runcon_longopts;
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| 107 | #endif
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| 108 | opt_complementary = "-1";
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| 109 | opts = getopt32(argv, "r:t:u:l:ch", &role, &type, &user, &range);
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| 110 | argv += optind;
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| 111 |
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| 112 | if (!(opts & OPTS_CONTEXT_COMPONENT)) {
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| 113 | context = *argv++;
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| 114 | if (!argv[0])
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| 115 | bb_error_msg_and_die("no command given");
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| 116 | }
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| 117 |
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| 118 | if (context) {
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| 119 | con = context_new(context);
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| 120 | if (!con)
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| 121 | bb_error_msg_and_die("'%s' is not a valid context", context);
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| 122 | } else {
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| 123 | con = runcon_compute_new_context(user, role, type, range,
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| 124 | argv[0], opts & OPTS_COMPUTE);
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| 125 | }
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| 126 |
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| 127 | if (security_check_context(context_str(con)))
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| 128 | bb_error_msg_and_die("'%s' is not a valid context",
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| 129 | context_str(con));
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| 130 |
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| 131 | if (setexeccon(context_str(con)))
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| 132 | bb_error_msg_and_die("can't set up security context '%s'",
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| 133 | context_str(con));
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| 134 |
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| 135 | execvp(argv[0], argv);
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| 136 | bb_perror_msg_and_die("can't execute '%s'", argv[0]);
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| 137 | }
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