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