busybox/libbb/run_shell.c

/* vi: set sw=4 ts=4: */
/*
 * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "libbb.h"
#if ENABLE_SELINUX
#include <selinux/selinux.h>  /* for setexeccon  */
#endif

#if ENABLE_SELINUX
static security_context_t current_sid;

void FAST_FUNC renew_current_security_context(void)
{
	freecon(current_sid);  /* Release old context  */
	getcon(&current_sid);  /* update */
}
void FAST_FUNC set_current_security_context(security_context_t sid)
{
	freecon(current_sid);  /* Release old context  */
	current_sid = sid;
}

#endif

/* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
 * If COMMAND is nonzero, pass it to the shell with the -c option.
 * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
 * arguments.  */
void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
{
	const char **args;
	int argno;
	int additional_args_cnt = 0;

	for (args = additional_args; args && *args; args++)
		additional_args_cnt++;

	args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));

	if (!shell || !shell[0])
		shell = DEFAULT_SHELL;

	args[0] = bb_get_last_path_component_nostrip(shell);
	if (loginshell)
		args[0] = xasprintf("-%s", args[0]);
	argno = 1;
	if (command) {
		args[argno++] = "-c";
		args[argno++] = command;
	}
	if (additional_args) {
		for (; *additional_args; ++additional_args)
			args[argno++] = *additional_args;
	}
	args[argno] = NULL;

#if ENABLE_SELINUX
	if (current_sid)
		setexeccon(current_sid);
	if (ENABLE_FEATURE_CLEAN_UP)
		freecon(current_sid);
#endif
	execv(shell, (char **) args);
	bb_perror_msg_and_die("can't execute '%s'", shell);
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
4	* All rights reserved.
5	*
6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions
8	* are met:
9	* 1. Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.
11	* 2. Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.
14	* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
15	* may be used to endorse or promote products derived from this software
16	* without specific prior written permission.
17	*
18	* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21	* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28	* SUCH DAMAGE.
29	*/
30
31	#include "libbb.h"
32	#if ENABLE_SELINUX
33	#include <selinux/selinux.h> /* for setexeccon */
34	#endif
35
36	#if ENABLE_SELINUX
37	static security_context_t current_sid;
38
39	void FAST_FUNC renew_current_security_context(void)
40	{
41	freecon(current_sid); /* Release old context */
42	getcon(&current_sid); /* update */
43	}
44	void FAST_FUNC set_current_security_context(security_context_t sid)
45	{
46	freecon(current_sid); /* Release old context */
47	current_sid = sid;
48	}
49
50	#endif
51
52	/* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
53	* If COMMAND is nonzero, pass it to the shell with the -c option.
54	* If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
55	* arguments. */
56	void FAST_FUNC run_shell(const char shell, int loginshell, const char command, const char **additional_args)
57	{
58	const char **args;
59	int argno;
60	int additional_args_cnt = 0;
61
62	for (args = additional_args; args && *args; args++)
63	additional_args_cnt++;
64
65	args = xmalloc(sizeof(char) (4 + additional_args_cnt));
66
67	if (!shell \|\| !shell[0])
68	shell = DEFAULT_SHELL;
69
70	args[0] = bb_get_last_path_component_nostrip(shell);
71	if (loginshell)
72	args[0] = xasprintf("-%s", args[0]);
73	argno = 1;
74	if (command) {
75	args[argno++] = "-c";
76	args[argno++] = command;
77	}
78	if (additional_args) {
79	for (; *additional_args; ++additional_args)
80	args[argno++] = *additional_args;
81	}
82	args[argno] = NULL;
83
84	#if ENABLE_SELINUX
85	if (current_sid)
86	setexeccon(current_sid);
87	if (ENABLE_FEATURE_CLEAN_UP)
88	freecon(current_sid);
89	#endif
90	execv(shell, (char **) args);
91	bb_perror_msg_and_die("can't execute '%s'", shell);
92	}