1 /*- 2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 3 * Copyright (c) 2004-2017 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 * $OpenPAM: openpam_dispatch.c 938 2017-04-30 21:34:42Z des $ 36 */ 37 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/param.h> 43 44 #include <stdint.h> 45 46 #include <security/pam_appl.h> 47 48 #include "openpam_impl.h" 49 50 #if !defined(OPENPAM_RELAX_CHECKS) 51 static void openpam_check_error_code(int, int); 52 #else 53 #define openpam_check_error_code(a, b) 54 #endif /* !defined(OPENPAM_RELAX_CHECKS) */ 55 56 /* 57 * OpenPAM internal 58 * 59 * Execute a module chain 60 */ 61 62 int 63 openpam_dispatch(pam_handle_t *pamh, 64 int primitive, 65 int flags) 66 { 67 pam_chain_t *chain; 68 int err, fail, nsuccess, r; 69 int debug; 70 71 ENTER(); 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 err = PAM_SUCCESS; 105 fail = nsuccess = 0; 106 for (; chain != NULL; chain = chain->next) { 107 if (chain->module->func[primitive] == NULL) { 108 openpam_log(PAM_LOG_ERROR, "%s: no %s()", 109 chain->module->path, pam_sm_func_name[primitive]); 110 r = PAM_SYMBOL_ERR; 111 } else { 112 pamh->primitive = primitive; 113 pamh->current = chain; 114 debug = (openpam_get_option(pamh, "debug") != NULL); 115 if (debug) 116 ++openpam_debug; 117 openpam_log(PAM_LOG_LIBDEBUG, "calling %s() in %s", 118 pam_sm_func_name[primitive], chain->module->path); 119 r = (chain->module->func[primitive])(pamh, flags, 120 chain->optc, (const char **)(intptr_t)chain->optv); 121 pamh->current = NULL; 122 openpam_log(PAM_LOG_LIBDEBUG, "%s: %s(): %s", 123 chain->module->path, pam_sm_func_name[primitive], 124 pam_strerror(pamh, r)); 125 if (debug) 126 --openpam_debug; 127 } 128 129 if (r == PAM_IGNORE) 130 continue; 131 if (r == PAM_SUCCESS) { 132 ++nsuccess; 133 /* 134 * For pam_setcred() and pam_chauthtok() with the 135 * PAM_PRELIM_CHECK flag, treat "sufficient" as 136 * "optional". 137 */ 138 if ((chain->flag == PAM_SUFFICIENT || 139 chain->flag == PAM_BINDING) && !fail && 140 primitive != PAM_SM_SETCRED && 141 !(primitive == PAM_SM_CHAUTHTOK && 142 (flags & PAM_PRELIM_CHECK))) 143 break; 144 continue; 145 } 146 147 openpam_check_error_code(primitive, r); 148 149 /* 150 * Record the return code from the first module to 151 * fail. If a required module fails, record the 152 * return code from the first required module to fail. 153 */ 154 if (err == PAM_SUCCESS) 155 err = r; 156 if ((chain->flag == PAM_REQUIRED || 157 chain->flag == PAM_BINDING) && !fail) { 158 openpam_log(PAM_LOG_LIBDEBUG, "required module failed"); 159 fail = 1; 160 err = r; 161 } 162 163 /* 164 * If a requisite module fails, terminate the chain 165 * immediately. 166 */ 167 if (chain->flag == PAM_REQUISITE) { 168 openpam_log(PAM_LOG_LIBDEBUG, "requisite module failed"); 169 fail = 1; 170 break; 171 } 172 } 173 174 if (!fail && err != PAM_NEW_AUTHTOK_REQD) 175 err = PAM_SUCCESS; 176 177 /* 178 * Require the chain to be non-empty, and at least one module 179 * in the chain to be successful, so that we don't fail open. 180 */ 181 if (err == PAM_SUCCESS && nsuccess < 1) { 182 openpam_log(PAM_LOG_ERROR, 183 "all modules were unsuccessful for %s()", 184 pam_sm_func_name[primitive]); 185 err = PAM_SYSTEM_ERR; 186 } 187 188 RETURNC(err); 189 } 190 191 #if !defined(OPENPAM_RELAX_CHECKS) 192 static void 193 openpam_check_error_code(int primitive, int r) 194 { 195 /* common error codes */ 196 if (r == PAM_SUCCESS || 197 r == PAM_SYSTEM_ERR || 198 r == PAM_SERVICE_ERR || 199 r == PAM_BUF_ERR || 200 r == PAM_CONV_ERR || 201 r == PAM_PERM_DENIED || 202 r == PAM_ABORT) 203 return; 204 205 /* specific error codes */ 206 switch (primitive) { 207 case PAM_SM_AUTHENTICATE: 208 if (r == PAM_AUTH_ERR || 209 r == PAM_CRED_INSUFFICIENT || 210 r == PAM_AUTHINFO_UNAVAIL || 211 r == PAM_USER_UNKNOWN || 212 r == PAM_MAXTRIES) 213 return; 214 break; 215 case PAM_SM_SETCRED: 216 if (r == PAM_CRED_UNAVAIL || 217 r == PAM_CRED_EXPIRED || 218 r == PAM_USER_UNKNOWN || 219 r == PAM_CRED_ERR) 220 return; 221 break; 222 case PAM_SM_ACCT_MGMT: 223 if (r == PAM_USER_UNKNOWN || 224 r == PAM_AUTH_ERR || 225 r == PAM_NEW_AUTHTOK_REQD || 226 r == PAM_ACCT_EXPIRED) 227 return; 228 break; 229 case PAM_SM_OPEN_SESSION: 230 case PAM_SM_CLOSE_SESSION: 231 if (r == PAM_SESSION_ERR) 232 return; 233 break; 234 case PAM_SM_CHAUTHTOK: 235 if (r == PAM_PERM_DENIED || 236 r == PAM_AUTHTOK_ERR || 237 r == PAM_AUTHTOK_RECOVERY_ERR || 238 r == PAM_AUTHTOK_LOCK_BUSY || 239 r == PAM_AUTHTOK_DISABLE_AGING || 240 r == PAM_TRY_AGAIN) 241 return; 242 break; 243 } 244 245 openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d", 246 pam_sm_func_name[primitive], r); 247 } 248 #endif /* !defined(OPENPAM_RELAX_CHECKS) */ 249 250 /* 251 * NODOC 252 * 253 * Error codes: 254 */ 255