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 "libbb.h"
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32 | #if ENABLE_SELINUX
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33 | #include <selinux/selinux.h> /* for setexeccon */
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34 | #endif
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35 |
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36 | #if ENABLE_SELINUX
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37 | static security_context_t current_sid;
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38 |
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39 | void FAST_FUNC renew_current_security_context(void)
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40 | {
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41 | freecon(current_sid); /* Release old context */
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42 | getcon(¤t_sid); /* update */
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43 | }
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44 | void FAST_FUNC set_current_security_context(security_context_t sid)
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45 | {
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46 | freecon(current_sid); /* Release old context */
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47 | current_sid = sid;
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48 | }
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49 |
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50 | #endif
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51 |
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52 | /* Run SHELL, or DEFAULT_SHELL if SHELL is "" or NULL.
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53 | * If COMMAND is nonzero, pass it to the shell with the -c option.
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54 | * If ADDITIONAL_ARGS is nonzero, pass it to the shell as more
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55 | * arguments. */
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56 | void FAST_FUNC run_shell(const char *shell, int loginshell, const char *command, const char **additional_args)
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57 | {
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58 | const char **args;
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59 | int argno;
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60 | int additional_args_cnt = 0;
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61 |
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62 | for (args = additional_args; args && *args; args++)
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63 | additional_args_cnt++;
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64 |
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65 | args = xmalloc(sizeof(char*) * (4 + additional_args_cnt));
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66 |
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67 | if (!shell || !shell[0])
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68 | shell = DEFAULT_SHELL;
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69 |
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70 | args[0] = bb_get_last_path_component_nostrip(shell);
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71 | if (loginshell)
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72 | args[0] = xasprintf("-%s", args[0]);
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73 | argno = 1;
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74 | if (command) {
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75 | args[argno++] = "-c";
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76 | args[argno++] = command;
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77 | }
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78 | if (additional_args) {
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79 | for (; *additional_args; ++additional_args)
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80 | args[argno++] = *additional_args;
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81 | }
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82 | args[argno] = NULL;
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83 |
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84 | #if ENABLE_SELINUX
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85 | if (current_sid)
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86 | setexeccon(current_sid);
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87 | if (ENABLE_FEATURE_CLEAN_UP)
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88 | freecon(current_sid);
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89 | #endif
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90 | execv(shell, (char **) args);
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91 | bb_perror_msg_and_die("can't execute '%s'", shell);
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92 | }
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