1 /* $NetBSD: pam_exec.c,v 1.2 2004/12/12 08:18:44 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2001,2003 Networks Associates Technology, Inc. 5 * All rights reserved. 6 * 7 * This software was developed for the FreeBSD Project by ThinkSec AS and 8 * NAI Labs, the Security Research Division of Network Associates, Inc. 9 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 10 * DARPA CHATS research program. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote 21 * products derived from this software without specific prior written 22 * permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/cdefs.h> 38 #ifdef __FreeBSD__ 39 __FBSDID("$FreeBSD: src/lib/libpam/modules/pam_exec/pam_exec.c,v 1.3 2003/02/06 12:56:51 des Exp $"); 40 #else 41 __RCSID("$NetBSD: pam_exec.c,v 1.2 2004/12/12 08:18:44 christos Exp $"); 42 #endif 43 44 #include <sys/types.h> 45 #include <sys/wait.h> 46 47 #include <errno.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 #include <security/pam_appl.h> 53 #include <security/pam_modules.h> 54 #include <security/openpam.h> 55 56 static int 57 _pam_exec(pam_handle_t *pamh __unused, int flags __unused, 58 int argc, const char *argv[]) 59 { 60 int childerr, status; 61 char **env, **envlist; 62 pid_t pid; 63 64 if (argc < 1) 65 return (PAM_SERVICE_ERR); 66 67 /* 68 * XXX For additional credit, divert child's stdin/stdout/stderr 69 * to the conversation function. 70 */ 71 envlist = pam_getenvlist(pamh); 72 childerr = 0; 73 if ((pid = vfork()) == 0) { 74 /*LINTED const cast*/ 75 execve(argv[0], (char **)__UNCONST(argv), envlist); 76 childerr = errno; 77 _exit(1); 78 } 79 for (env = envlist; *env != NULL; ++env) 80 free(*env); 81 free(envlist); 82 if (pid == -1) { 83 openpam_log(PAM_LOG_ERROR, "vfork(): %m"); 84 return (PAM_SYSTEM_ERR); 85 } 86 if (waitpid(pid, &status, 0) == -1) { 87 openpam_log(PAM_LOG_ERROR, "waitpid(): %m"); 88 return (PAM_SYSTEM_ERR); 89 } 90 if (childerr != 0) { 91 openpam_log(PAM_LOG_ERROR, "execv(): %m"); 92 return (PAM_SYSTEM_ERR); 93 } 94 if (WIFSIGNALED(status)) { 95 openpam_log(PAM_LOG_ERROR, "%s caught signal %d%s", 96 argv[0], WTERMSIG(status), 97 WCOREDUMP(status) ? " (core dumped)" : ""); 98 return (PAM_SYSTEM_ERR); 99 } 100 if (!WIFEXITED(status)) { 101 openpam_log(PAM_LOG_ERROR, "unknown status 0x%x", status); 102 return (PAM_SYSTEM_ERR); 103 } 104 if (WEXITSTATUS(status) != 0) { 105 openpam_log(PAM_LOG_ERROR, "%s returned code %d", 106 argv[0], WEXITSTATUS(status)); 107 return (PAM_SYSTEM_ERR); 108 } 109 return (PAM_SUCCESS); 110 } 111 112 PAM_EXTERN int 113 pam_sm_authenticate(pam_handle_t *pamh, int flags, 114 int argc, const char *argv[]) 115 { 116 117 return (_pam_exec(pamh, flags, argc, argv)); 118 } 119 120 PAM_EXTERN int 121 pam_sm_setcred(pam_handle_t *pamh, int flags, 122 int argc, const char *argv[]) 123 { 124 125 return (_pam_exec(pamh, flags, argc, argv)); 126 } 127 128 PAM_EXTERN int 129 pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, 130 int argc, const char *argv[]) 131 { 132 133 return (_pam_exec(pamh, flags, argc, argv)); 134 } 135 136 PAM_EXTERN int 137 pam_sm_open_session(pam_handle_t *pamh, int flags, 138 int argc, const char *argv[]) 139 { 140 141 return (_pam_exec(pamh, flags, argc, argv)); 142 } 143 144 PAM_EXTERN int 145 pam_sm_close_session(pam_handle_t *pamh, int flags, 146 int argc, const char *argv[]) 147 { 148 149 return (_pam_exec(pamh, flags, argc, argv)); 150 } 151 152 PAM_EXTERN int 153 pam_sm_chauthtok(pam_handle_t *pamh, int flags, 154 int argc, const char *argv[]) 155 { 156 157 return (_pam_exec(pamh, flags, argc, argv)); 158 } 159 160 PAM_MODULE_ENTRY("pam_exec"); 161