[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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| 15 | * may be used to endorse or promote products derived from this software
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| 16 | * without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 28 | * SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #include <stdio.h>
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| 32 | #include <errno.h>
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| 33 | #include <unistd.h>
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| 34 | #include <string.h>
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| 35 | #include <stdlib.h>
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| 36 | #include <syslog.h>
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| 37 | #include <ctype.h>
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| 38 | #include "libbb.h"
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| 39 | #ifdef CONFIG_SELINUX
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| 40 | #include <selinux/selinux.h> /* for setexeccon */
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| 41 | #endif
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| 42 |
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| 43 | #ifdef CONFIG_SELINUX
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| 44 | static security_context_t current_sid=NULL;
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| 45 |
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| 46 | void
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| 47 | renew_current_security_context(void)
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| 48 | {
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| 49 | if (current_sid)
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| 50 | freecon(current_sid); /* Release old context */
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| 51 |
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| 52 | getcon(¤t_sid); /* update */
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| 53 |
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| 54 | return;
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| 55 | }
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| 56 | void
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| 57 | set_current_security_context(security_context_t sid)
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| 58 | {
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| 59 | if (current_sid)
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| 60 | freecon(current_sid); /* Release old context */
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| 61 |
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| 62 | current_sid=sid;
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| 63 |
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| 64 | return;
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| 65 | }
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| 66 |
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| 67 | #endif
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| 68 |
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| 69 | /* Run SHELL, or DEFAULT_SHELL if SHELL is empty.
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| 70 | If COMMAND is nonzero, pass it to the shell with the -c option.
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| 71 | If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
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| 72 | arguments. */
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| 73 |
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| 74 | void run_shell ( const char *shell, int loginshell, const char *command, const char **additional_args)
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| 75 | {
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| 76 | const char **args;
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| 77 | int argno = 1;
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| 78 | int additional_args_cnt = 0;
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| 79 |
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| 80 | for ( args = additional_args; args && *args; args++ )
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| 81 | additional_args_cnt++;
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| 82 |
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| 83 | args = (const char **) xmalloc (sizeof (char *) * ( 4 + additional_args_cnt ));
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| 84 |
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| 85 | args [0] = bb_get_last_path_component ( bb_xstrdup ( shell ));
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| 86 |
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| 87 | if ( loginshell )
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| 88 | args [0] = bb_xasprintf ("-%s", args [0]);
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| 89 |
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| 90 | if ( command ) {
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| 91 | args [argno++] = "-c";
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| 92 | args [argno++] = command;
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| 93 | }
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| 94 | if ( additional_args ) {
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| 95 | for ( ; *additional_args; ++additional_args )
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| 96 | args [argno++] = *additional_args;
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| 97 | }
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| 98 | args [argno] = 0;
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| 99 | #ifdef CONFIG_SELINUX
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| 100 | if ( (current_sid) && (!setexeccon(current_sid)) ) {
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| 101 | freecon(current_sid);
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| 102 | execve(shell, (char **) args, environ);
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| 103 | } else
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| 104 | #endif
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| 105 | execv ( shell, (char **) args );
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| 106 | bb_perror_msg_and_die ( "cannot run %s", shell );
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| 107 | }
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