Magellan Linux

  • Back to homepage
    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/selinux/runcon.c

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

    Parent Directory Parent Directory | Revision Log Revision Log

    Revision 984 - (hide annotations) (download)
    Sun May 30 11:32:42 2010 UTC (14 years 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 niro 816 /*
    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 niro 984 *
    29     * Licensed under GPLv2, see file LICENSE in this tarball for details.
    30 niro 816 */
    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 niro 984 bb_error_msg_and_die("can't get current context");
    45 niro 816
    46     if (compute_trans) {
    47     security_context_t file_context, new_context;
    48    
    49     if (getfilecon(command, &file_context) < 0)
    50 niro 984 bb_error_msg_and_die("can't retrieve attributes of '%s'",
    51 niro 816 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 niro 984 bb_error_msg_and_die("can't set up security context '%s'",
    133 niro 816 context_str(con));
    134    
    135     execvp(argv[0], argv);
    136    
    137 niro 984 bb_perror_msg_and_die("can't execute '%s'", argv[0]);
    138 niro 816 }