/*- * Copyright (c) 2002-2003 Networks Associates Technology, Inc. * Copyright (c) 2004-2017 Dag-Erling Smørgrav * All rights reserved. * * This software was developed for the FreeBSD Project by ThinkSec AS and * Network Associates Laboratories, the Security Research Division of * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 * ("CBOSS"), as part of the DARPA CHATS research program. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include "openpam_impl.h" #if !defined(OPENPAM_RELAX_CHECKS) static void openpam_check_error_code(int, int); #else #define openpam_check_error_code(a, b) #endif /* !defined(OPENPAM_RELAX_CHECKS) */ /* * OpenPAM internal * * Execute a module chain */ int openpam_dispatch(pam_handle_t *pamh, int primitive, int flags) { pam_chain_t *chain; int err, fail, nsuccess, r; int debug; ENTER(); /* prevent recursion */ if (pamh->current != NULL) { openpam_log(PAM_LOG_ERROR, "%s() called while %s::%s() is in progress", pam_func_name[primitive], pamh->current->module->path, pam_sm_func_name[pamh->primitive]); RETURNC(PAM_ABORT); } /* pick a chain */ switch (primitive) { case PAM_SM_AUTHENTICATE: case PAM_SM_SETCRED: chain = pamh->chains[PAM_AUTH]; break; case PAM_SM_ACCT_MGMT: chain = pamh->chains[PAM_ACCOUNT]; break; case PAM_SM_OPEN_SESSION: case PAM_SM_CLOSE_SESSION: chain = pamh->chains[PAM_SESSION]; break; case PAM_SM_CHAUTHTOK: chain = pamh->chains[PAM_PASSWORD]; break; default: RETURNC(PAM_SYSTEM_ERR); } /* execute */ err = PAM_SUCCESS; fail = nsuccess = 0; for (; chain != NULL; chain = chain->next) { if (chain->module->func[primitive] == NULL) { openpam_log(PAM_LOG_ERROR, "%s: no %s()", chain->module->path, pam_sm_func_name[primitive]); r = PAM_SYMBOL_ERR; } else { pamh->primitive = primitive; pamh->current = chain; debug = (openpam_get_option(pamh, "debug") != NULL); if (debug) ++openpam_debug; openpam_log(PAM_LOG_LIBDEBUG, "calling %s() in %s", pam_sm_func_name[primitive], chain->module->path); r = (chain->module->func[primitive])(pamh, flags, chain->optc, (const char **)(intptr_t)chain->optv); pamh->current = NULL; openpam_log(PAM_LOG_LIBDEBUG, "%s: %s(): %s", chain->module->path, pam_sm_func_name[primitive], pam_strerror(pamh, r)); if (debug) --openpam_debug; } if (r == PAM_IGNORE) continue; if (r == PAM_SUCCESS) { ++nsuccess; /* * For pam_setcred() and pam_chauthtok() with the * PAM_PRELIM_CHECK flag, treat "sufficient" as * "optional". */ if ((chain->flag == PAM_SUFFICIENT || chain->flag == PAM_BINDING) && !fail && primitive != PAM_SM_SETCRED && !(primitive == PAM_SM_CHAUTHTOK && (flags & PAM_PRELIM_CHECK))) break; continue; } openpam_check_error_code(primitive, r); /* * Record the return code from the first module to * fail. If a required module fails, record the * return code from the first required module to fail. */ if (err == PAM_SUCCESS) err = r; if ((chain->flag == PAM_REQUIRED || chain->flag == PAM_BINDING) && !fail) { openpam_log(PAM_LOG_LIBDEBUG, "required module failed"); fail = 1; err = r; } /* * If a requisite module fails, terminate the chain * immediately. */ if (chain->flag == PAM_REQUISITE) { openpam_log(PAM_LOG_LIBDEBUG, "requisite module failed"); fail = 1; break; } } if (!fail && err != PAM_NEW_AUTHTOK_REQD) err = PAM_SUCCESS; /* * Require the chain to be non-empty, and at least one module * in the chain to be successful, so that we don't fail open. */ if (err == PAM_SUCCESS && nsuccess < 1) { openpam_log(PAM_LOG_ERROR, "all modules were unsuccessful for %s()", pam_sm_func_name[primitive]); err = PAM_SYSTEM_ERR; } RETURNC(err); } #if !defined(OPENPAM_RELAX_CHECKS) static void openpam_check_error_code(int primitive, int r) { /* common error codes */ if (r == PAM_SUCCESS || r == PAM_SYSTEM_ERR || r == PAM_SERVICE_ERR || r == PAM_BUF_ERR || r == PAM_CONV_ERR || r == PAM_PERM_DENIED || r == PAM_ABORT) return; /* specific error codes */ switch (primitive) { case PAM_SM_AUTHENTICATE: if (r == PAM_AUTH_ERR || r == PAM_CRED_INSUFFICIENT || r == PAM_AUTHINFO_UNAVAIL || r == PAM_USER_UNKNOWN || r == PAM_MAXTRIES) return; break; case PAM_SM_SETCRED: if (r == PAM_CRED_UNAVAIL || r == PAM_CRED_EXPIRED || r == PAM_USER_UNKNOWN || r == PAM_CRED_ERR) return; break; case PAM_SM_ACCT_MGMT: if (r == PAM_USER_UNKNOWN || r == PAM_AUTH_ERR || r == PAM_NEW_AUTHTOK_REQD || r == PAM_ACCT_EXPIRED) return; break; case PAM_SM_OPEN_SESSION: case PAM_SM_CLOSE_SESSION: if (r == PAM_SESSION_ERR) return; break; case PAM_SM_CHAUTHTOK: if (r == PAM_PERM_DENIED || r == PAM_AUTHTOK_ERR || r == PAM_AUTHTOK_RECOVERY_ERR || r == PAM_AUTHTOK_LOCK_BUSY || r == PAM_AUTHTOK_DISABLE_AGING || r == PAM_TRY_AGAIN) return; break; } openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d", pam_sm_func_name[primitive], r); } #endif /* !defined(OPENPAM_RELAX_CHECKS) */ /* * NODOC * * Error codes: */