blob: 9494f271c8cb9df8d242b1c9fcb4c9efc91ddd97
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 = NULL; |
38 | |
39 | void FAST_FUNC renew_current_security_context(void) |
40 | { |
41 | if (current_sid) |
42 | freecon(current_sid); /* Release old context */ |
43 | getcon(¤t_sid); /* update */ |
44 | } |
45 | void FAST_FUNC set_current_security_context(security_context_t sid) |
46 | { |
47 | if (current_sid) |
48 | freecon(current_sid); /* Release old context */ |
49 | current_sid = sid; |
50 | } |
51 | |
52 | #endif |
53 | |
54 | /* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL. |
55 | * If COMMAND is nonzero, pass it to the shell with the -c option. |
56 | * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more |
57 | * arguments. */ |
58 | void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args) |
59 | { |
60 | const char **args; |
61 | int argno; |
62 | int additional_args_cnt = 0; |
63 | |
64 | for (args = additional_args; args && *args; args++) |
65 | additional_args_cnt++; |
66 | |
67 | args = xmalloc(sizeof(char*) * (4 + additional_args_cnt)); |
68 | |
69 | if (!shell || !shell[0]) |
70 | shell = DEFAULT_SHELL; |
71 | |
72 | args[0] = bb_get_last_path_component_nostrip(shell); |
73 | if (loginshell) |
74 | args[0] = xasprintf("-%s", args[0]); |
75 | argno = 1; |
76 | if (command) { |
77 | args[argno++] = "-c"; |
78 | args[argno++] = command; |
79 | } |
80 | if (additional_args) { |
81 | for (; *additional_args; ++additional_args) |
82 | args[argno++] = *additional_args; |
83 | } |
84 | args[argno] = NULL; |
85 | |
86 | #if ENABLE_SELINUX |
87 | renew_current_security_context(); |
88 | if (current_sid) |
89 | setexeccon(current_sid); |
90 | if (ENABLE_FEATURE_CLEAN_UP) |
91 | freecon(current_sid); |
92 | #endif |
93 | execv(shell, (char **) args); |
94 | bb_perror_msg_and_die("can't execute '%s'", shell); |
95 | } |
96 |