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

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    Revision 816 - (hide annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
    File MIME type: text/plain
    File size: 4061 byte(s) 
    -updated to busybox-1.13.4
    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     */
    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     }