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