1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by ThinkSec AS and 7 * Network Associates Laboratories, the Security Research Division of 8 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 9 * ("CBOSS"), as part of the DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * $Id: openpam_dispatch.c 649 2013-03-05 17:58:33Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/param.h> 43 44 #include <security/pam_appl.h> 45 46 #include "openpam_impl.h" 47 48 #if !defined(OPENPAM_RELAX_CHECKS) 49 static void openpam_check_error_code(int, int); 50 #else 51 #define openpam_check_error_code(a, b) 52 #endif /* !defined(OPENPAM_RELAX_CHECKS) */ 53 54 /* 55 * OpenPAM internal 56 * 57 * Execute a module chain 58 */ 59 60 int 61 openpam_dispatch(pam_handle_t *pamh, 62 int primitive, 63 int flags) 64 { 65 pam_chain_t *chain; 66 int err, fail, r; 67 int debug; 68 69 ENTER(); 70 if (pamh == NULL) 71 RETURNC(PAM_SYSTEM_ERR); 72 73 /* prevent recursion */ 74 if (pamh->current != NULL) { 75 openpam_log(PAM_LOG_ERROR, 76 "%s() called while %s::%s() is in progress", 77 pam_func_name[primitive], 78 pamh->current->module->path, 79 pam_sm_func_name[pamh->primitive]); 80 RETURNC(PAM_ABORT); 81 } 82 83 /* pick a chain */ 84 switch (primitive) { 85 case PAM_SM_AUTHENTICATE: 86 case PAM_SM_SETCRED: 87 chain = pamh->chains[PAM_AUTH]; 88 break; 89 case PAM_SM_ACCT_MGMT: 90 chain = pamh->chains[PAM_ACCOUNT]; 91 break; 92 case PAM_SM_OPEN_SESSION: 93 case PAM_SM_CLOSE_SESSION: 94 chain = pamh->chains[PAM_SESSION]; 95 break; 96 case PAM_SM_CHAUTHTOK: 97 chain = pamh->chains[PAM_PASSWORD]; 98 break; 99 default: 100 RETURNC(PAM_SYSTEM_ERR); 101 } 102 103 /* execute */ 104 for (err = fail = 0; chain != NULL; chain = chain->next) { 105 if (chain->module->func[primitive] == NULL) { 106 openpam_log(PAM_LOG_ERROR, "%s: no %s()", 107 chain->module->path, pam_sm_func_name[primitive]); 108 r = PAM_SYSTEM_ERR; 109 } else { 110 pamh->primitive = primitive; 111 pamh->current = chain; 112 debug = (openpam_get_option(pamh, "debug") != NULL); 113 if (debug) 114 ++openpam_debug; 115 openpam_log(PAM_LOG_LIBDEBUG, "calling %s() in %s", 116 pam_sm_func_name[primitive], chain->module->path); 117 r = (chain->module->func[primitive])(pamh, flags, 118 chain->optc, (const char **)chain->optv); 119 pamh->current = NULL; 120 openpam_log(PAM_LOG_LIBDEBUG, "%s: %s(): %s", 121 chain->module->path, pam_sm_func_name[primitive], 122 pam_strerror(pamh, r)); 123 if (debug) 124 --openpam_debug; 125 } 126 127 if (r == PAM_IGNORE) 128 continue; 129 if (r == PAM_SUCCESS) { 130 /* 131 * For pam_setcred() and pam_chauthtok() with the 132 * PAM_PRELIM_CHECK flag, treat "sufficient" as 133 * "optional". 134 */ 135 if ((chain->flag == PAM_SUFFICIENT || 136 chain->flag == PAM_BINDING) && !fail && 137 primitive != PAM_SM_SETCRED && 138 !(primitive == PAM_SM_CHAUTHTOK && 139 (flags & PAM_PRELIM_CHECK))) 140 break; 141 continue; 142 } 143 144 openpam_check_error_code(primitive, r); 145 146 /* 147 * Record the return code from the first module to 148 * fail. If a required module fails, record the 149 * return code from the first required module to fail. 150 */ 151 if (err == 0) 152 err = r; 153 if ((chain->flag == PAM_REQUIRED || 154 chain->flag == PAM_BINDING) && !fail) { 155 openpam_log(PAM_LOG_LIBDEBUG, "required module failed"); 156 fail = 1; 157 err = r; 158 } 159 160 /* 161 * If a requisite module fails, terminate the chain 162 * immediately. 163 */ 164 if (chain->flag == PAM_REQUISITE) { 165 openpam_log(PAM_LOG_LIBDEBUG, "requisite module failed"); 166 fail = 1; 167 break; 168 } 169 } 170 171 if (!fail && err != PAM_NEW_AUTHTOK_REQD) 172 err = PAM_SUCCESS; 173 RETURNC(err); 174 } 175 176 #if !defined(OPENPAM_RELAX_CHECKS) 177 static void 178 openpam_check_error_code(int primitive, int r) 179 { 180 /* common error codes */ 181 if (r == PAM_SUCCESS || 182 r == PAM_SYSTEM_ERR || 183 r == PAM_SERVICE_ERR || 184 r == PAM_BUF_ERR || 185 r == PAM_CONV_ERR || 186 r == PAM_PERM_DENIED || 187 r == PAM_ABORT) 188 return; 189 190 /* specific error codes */ 191 switch (primitive) { 192 case PAM_SM_AUTHENTICATE: 193 if (r == PAM_AUTH_ERR || 194 r == PAM_CRED_INSUFFICIENT || 195 r == PAM_AUTHINFO_UNAVAIL || 196 r == PAM_USER_UNKNOWN || 197 r == PAM_MAXTRIES) 198 return; 199 break; 200 case PAM_SM_SETCRED: 201 if (r == PAM_CRED_UNAVAIL || 202 r == PAM_CRED_EXPIRED || 203 r == PAM_USER_UNKNOWN || 204 r == PAM_CRED_ERR) 205 return; 206 break; 207 case PAM_SM_ACCT_MGMT: 208 if (r == PAM_USER_UNKNOWN || 209 r == PAM_AUTH_ERR || 210 r == PAM_NEW_AUTHTOK_REQD || 211 r == PAM_ACCT_EXPIRED) 212 return; 213 break; 214 case PAM_SM_OPEN_SESSION: 215 case PAM_SM_CLOSE_SESSION: 216 if (r == PAM_SESSION_ERR) 217 return; 218 break; 219 case PAM_SM_CHAUTHTOK: 220 if (r == PAM_PERM_DENIED || 221 r == PAM_AUTHTOK_ERR || 222 r == PAM_AUTHTOK_RECOVERY_ERR || 223 r == PAM_AUTHTOK_LOCK_BUSY || 224 r == PAM_AUTHTOK_DISABLE_AGING || 225 r == PAM_TRY_AGAIN) 226 return; 227 break; 228 } 229 230 openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d", 231 pam_sm_func_name[primitive], r); 232 } 233 #endif /* !defined(OPENPAM_RELAX_CHECKS) */ 234 235 /* 236 * NODOC 237 * 238 * Error codes: 239 */ 240