blob: 93ab8165a4790a8ecb1f0809ece278cc637000e4
| 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 ADDITIONAL_ARGS is not NULL, pass them to the shell. |
| 56 | */ |
| 57 | void FAST_FUNC run_shell(const char *shell, int loginshell, const char **additional_args) |
| 58 | { |
| 59 | const char **args; |
| 60 | |
| 61 | args = additional_args; |
| 62 | while (args && *args) |
| 63 | args++; |
| 64 | |
| 65 | args = xmalloc(sizeof(char*) * (2 + (args - additional_args))); |
| 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 | args[1] = NULL; |
| 74 | if (additional_args) { |
| 75 | int cnt = 1; |
| 76 | for (;;) |
| 77 | if ((args[cnt++] = *additional_args++) == NULL) |
| 78 | break; |
| 79 | } |
| 80 | |
| 81 | #if ENABLE_SELINUX |
| 82 | renew_current_security_context(); |
| 83 | if (current_sid) |
| 84 | setexeccon(current_sid); |
| 85 | if (ENABLE_FEATURE_CLEAN_UP) |
| 86 | freecon(current_sid); |
| 87 | #endif |
| 88 | execv(shell, (char **) args); |
| 89 | bb_perror_msg_and_die("can't execute '%s'", shell); |
| 90 | } |
| 91 |