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
renew_current_security_context(void)39 void FAST_FUNC renew_current_security_context(void)
40 {
41 freecon(current_sid); /* Release old context */
42 getcon(¤t_sid); /* update */
43 }
set_current_security_context(security_context_t sid)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 ADDITIONAL_ARGS is not NULL, pass them to the shell.
54 */
run_shell(const char * shell,int loginshell,const char ** additional_args)55 void FAST_FUNC run_shell(const char *shell, int loginshell, const char **additional_args)
56 {
57 const char **args;
58
59 args = additional_args;
60 while (args && *args)
61 args++;
62
63 args = xmalloc(sizeof(char*) * (2 + (args - additional_args)));
64
65 if (!shell || !shell[0])
66 shell = DEFAULT_SHELL;
67
68 args[0] = bb_get_last_path_component_nostrip(shell);
69 if (loginshell)
70 args[0] = xasprintf("-%s", args[0]);
71 args[1] = NULL;
72 if (additional_args) {
73 int cnt = 1;
74 for (;;)
75 if ((args[cnt++] = *additional_args++) == NULL)
76 break;
77 }
78
79 #if ENABLE_SELINUX
80 if (current_sid)
81 setexeccon(current_sid);
82 if (ENABLE_FEATURE_CLEAN_UP)
83 freecon(current_sid);
84 #endif
85 execv(shell, (char **) args);
86 bb_perror_msg_and_die("can't execute '%s'", shell);
87 }
88