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    Contents of /trunk/mkinitrd-magellan/busybox/selinux/runcon.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 4131 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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("failed to set new user '%s'", user);
    63 if (type && context_type_set(con, type))
    64 bb_error_msg_and_die("failed to set new type '%s'", type);
    65 if (range && context_range_set(con, range))
    66 bb_error_msg_and_die("failed to set new range '%s'", range);
    67 if (role && context_role_set(con, role))
    68 bb_error_msg_and_die("failed to 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
    137 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
    138 }