| /* 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(¤t_sid); /* update */ |
| } |
| void FAST_FUNC set_current_security_context(security_context_t sid) |
| { |
| freecon(current_sid); /* Release old context */ |
| current_sid = sid; |
| } |
| |
| #endif |
| |
| /* Exec SHELL, or DEFAULT_SHELL if SHELL is "" or NULL. |
| * If ADDITIONAL_ARGS is not NULL, pass them to the shell. |
| */ |
| void FAST_FUNC exec_shell(const char *shell, int loginshell, const char **additional_args) |
| { |
| const char **args; |
| |
| args = additional_args; |
| while (args && *args) |
| args++; |
| |
| args = xzalloc(sizeof(args[0]) * (2 + (args - additional_args))); |
| |
| if (!shell || !shell[0]) |
| shell = DEFAULT_SHELL; |
| |
| args[0] = bb_get_last_path_component_nostrip(shell); |
| if (loginshell) |
| args[0] = xasprintf("-%s", args[0]); |
| /*args[1] = NULL; - already is */ |
| if (additional_args) { |
| int cnt = 0; |
| while (*additional_args) |
| args[++cnt] = *additional_args++; |
| } |
| |
| #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); |
| } |
| |
| void FAST_FUNC exec_login_shell(const char *shell) |
| { |
| exec_shell(shell, 1, NULL); |
| } |
| |
| /* Typical idiom for applets which exec *optional* PROG [ARGS] */ |
| void FAST_FUNC exec_prog_or_SHELL(char **argv) |
| { |
| if (argv[0]) { |
| BB_EXECVP_or_die(argv); |
| } |
| /* Both users (nsenter and unshare) do indeed exec |
| * a _login_ shell (with dash in argv[0])! |
| */ |
| exec_login_shell(getenv("SHELL")); |
| } |