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/*
* runcon [ context |
* ( [ -c ] [ -r role ] [-t type] [ -u user ] [ -l levelrange ] )
* command [arg1 [arg2 ...] ]
*
* attempt to run the specified command with the specified context.
*
* -r role : use the current context with the specified role
* -t type : use the current context with the specified type
* -u user : use the current context with the specified user
* -l level : use the current context with the specified level range
* -c : compute process transition context before modifying
*
* Contexts are interpreted as follows:
*
* Number of MLS
* components system?
*
* 1 - type
* 2 - role:type
* 3 Y role:type:range
* 3 N user:role:type
* 4 Y user:role:type:range
* 4 N error
*
* Port to busybox: KaiGai Kohei <kaigai@kaigai.gr.jp>
* - based on coreutils-5.97 (in Fedora Core 6)
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config RUNCON
//config: bool "runcon (6.6 kb)"
//config: default n
//config: depends on SELINUX
//config: help
//config: Enable support to run command in specified security context.
//applet:IF_RUNCON(APPLET(runcon, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_RUNCON) += runcon.o
//usage:#define runcon_trivial_usage
//usage: "[-c] [-u USER] [-r ROLE] [-t TYPE] [-l RANGE] PROG ARGS\n"
//usage: "runcon CONTEXT PROG ARGS"
//usage:#define runcon_full_usage "\n\n"
//usage: "Run PROG in a different security context\n"
//usage: "\n CONTEXT Complete security context\n"
//usage: "\n -c Compute process transition context before modifying"
//usage: "\n -t TYPE Type (for same role as parent)"
//usage: "\n -u USER User identity"
//usage: "\n -r ROLE Role"
//usage: "\n -l RNG Levelrange"
#include <selinux/context.h>
/* from deprecated <selinux/flask.h>: */
#undef SECCLASS_PROCESS
#define SECCLASS_PROCESS 2
#include "libbb.h"
static context_t runcon_compute_new_context(char *user, char *role, char *type, char *range,
char *command, int compute_trans)
{
context_t con;
security_context_t cur_context;
if (getcon(&cur_context))
bb_simple_error_msg_and_die("can't get current context");
if (compute_trans) {
security_context_t file_context, new_context;
if (getfilecon(command, &file_context) < 0)
bb_error_msg_and_die("can't retrieve attributes of '%s'",
command);
if (security_compute_create(cur_context, file_context,
SECCLASS_PROCESS, &new_context))
bb_simple_error_msg_and_die("unable to compute a new context");
cur_context = new_context;
}
con = context_new(cur_context);
if (!con)
bb_error_msg_and_die("'%s' is not a valid context", cur_context);
if (user && context_user_set(con, user))
bb_error_msg_and_die("can't set new user '%s'", user);
if (type && context_type_set(con, type))
bb_error_msg_and_die("can't set new type '%s'", type);
if (range && context_range_set(con, range))
bb_error_msg_and_die("can't set new range '%s'", range);
if (role && context_role_set(con, role))
bb_error_msg_and_die("can't set new role '%s'", role);
return con;
}
#if ENABLE_LONG_OPTS
static const char runcon_longopts[] ALIGN1 =
"user\0" Required_argument "u"
"role\0" Required_argument "r"
"type\0" Required_argument "t"
"range\0" Required_argument "l"
"compute\0" No_argument "c"
"help\0" No_argument "h"
;
#endif
#define OPTS_ROLE (1<<0) /* r */
#define OPTS_TYPE (1<<1) /* t */
#define OPTS_USER (1<<2) /* u */
#define OPTS_RANGE (1<<3) /* l */
#define OPTS_COMPUTE (1<<4) /* c */
#define OPTS_HELP (1<<5) /* h */
#define OPTS_CONTEXT_COMPONENT (OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int runcon_main(int argc UNUSED_PARAM, char **argv)
{
char *role = NULL;
char *range = NULL;
char *user = NULL;
char *type = NULL;
char *context = NULL;
unsigned opts;
context_t con;
selinux_or_die();
opts = getopt32long(argv, "^"
"r:t:u:l:ch"
"\0" "-1",
runcon_longopts,
&role, &type, &user, &range
);
argv += optind;
if (!(opts & OPTS_CONTEXT_COMPONENT)) {
context = *argv++;
if (!argv[0])
bb_simple_error_msg_and_die("no command given");
}
if (context) {
con = context_new(context);
if (!con)
bb_error_msg_and_die("'%s' is not a valid context", context);
} else {
con = runcon_compute_new_context(user, role, type, range,
argv[0], opts & OPTS_COMPUTE);
}
if (security_check_context(context_str(con)))
bb_error_msg_and_die("'%s' is not a valid context",
context_str(con));
if (setexeccon(context_str(con)))
bb_error_msg_and_die("can't set up security context '%s'",
context_str(con));
BB_EXECVP_or_die(argv);
}
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