| 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 |
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| 40 |
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| 41 |
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| 42 | #define DEFAULT_LOGIN_PATH "/bin:/usr/bin"
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| 43 | #define DEFAULT_ROOT_LOGIN_PATH "/usr/sbin:/bin:/usr/bin:/sbin"
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| 44 |
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| 45 | static void xsetenv ( const char *key, const char *value )
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| 46 | {
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| 47 | if ( setenv ( key, value, 1 ))
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| 48 | bb_error_msg_and_die (bb_msg_memory_exhausted);
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| 49 | }
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| 50 |
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| 51 | void setup_environment ( const char *shell, int loginshell, int changeenv, const struct passwd *pw )
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| 52 | {
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| 53 | if ( loginshell ) {
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| 54 | const char *term;
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| 55 |
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| 56 | /* Change the current working directory to be the home directory
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| 57 | * of the user. It is a fatal error for this process to be unable
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| 58 | * to change to that directory. There is no "default" home
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| 59 | * directory.
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| 60 | * Some systems default to HOME=/
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| 61 | */
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| 62 | if ( chdir ( pw-> pw_dir )) {
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| 63 | if ( chdir ( "/" )) {
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| 64 | syslog ( LOG_WARNING, "unable to cd to %s' for user %s'\n", pw-> pw_dir, pw-> pw_name );
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| 65 | bb_error_msg_and_die ( "cannot cd to home directory or /" );
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| 66 | }
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| 67 | fputs ( "warning: cannot change to home directory\n", stderr );
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| 68 | }
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| 69 |
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| 70 | /* Leave TERM unchanged. Set HOME, SHELL, USER, LOGNAME, PATH.
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| 71 | Unset all other environment variables. */
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| 72 | term = getenv ("TERM");
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| 73 | clearenv ( );
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| 74 | if ( term )
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| 75 | xsetenv ( "TERM", term );
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| 76 | xsetenv ( "HOME", pw-> pw_dir );
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| 77 | xsetenv ( "SHELL", shell );
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| 78 | xsetenv ( "USER", pw-> pw_name );
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| 79 | xsetenv ( "LOGNAME", pw-> pw_name );
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| 80 | xsetenv ( "PATH", ( pw-> pw_uid ? DEFAULT_LOGIN_PATH : DEFAULT_ROOT_LOGIN_PATH ));
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| 81 | }
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| 82 | else if ( changeenv ) {
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| 83 | /* Set HOME, SHELL, and if not becoming a super-user,
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| 84 | USER and LOGNAME. */
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| 85 | xsetenv ( "HOME", pw-> pw_dir );
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| 86 | xsetenv ( "SHELL", shell );
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| 87 | if ( pw-> pw_uid ) {
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| 88 | xsetenv ( "USER", pw-> pw_name );
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| 89 | xsetenv ( "LOGNAME", pw-> pw_name );
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| 90 | }
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| 91 | }
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| 92 | }
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| 93 |
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