255 lines
6.8 KiB
C
255 lines
6.8 KiB
C
/*-
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* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
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* Copyright (c) 2004-2011 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by ThinkSec AS and
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* Network Associates Laboratories, the Security Research Division of
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* Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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* ("CBOSS"), as part of the DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: openpam_dispatch.c 807 2014-09-09 09:41:32Z des $
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <sys/param.h>
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#include <security/pam_appl.h>
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#include "openpam_impl.h"
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#if !defined(OPENPAM_RELAX_CHECKS)
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static void openpam_check_error_code(int, int);
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#else
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#define openpam_check_error_code(a, b)
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#endif /* !defined(OPENPAM_RELAX_CHECKS) */
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/*
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* OpenPAM internal
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*
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* Execute a module chain
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*/
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int
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openpam_dispatch(pam_handle_t *pamh,
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int primitive,
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int flags)
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{
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pam_chain_t *chain;
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int err, fail, nsuccess, r;
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int debug;
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ENTER();
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if (pamh == NULL)
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RETURNC(PAM_SYSTEM_ERR);
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/* prevent recursion */
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if (pamh->current != NULL) {
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openpam_log(PAM_LOG_ERROR,
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"%s() called while %s::%s() is in progress",
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pam_func_name[primitive],
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pamh->current->module->path,
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pam_sm_func_name[pamh->primitive]);
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RETURNC(PAM_ABORT);
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}
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/* pick a chain */
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switch (primitive) {
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case PAM_SM_AUTHENTICATE:
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case PAM_SM_SETCRED:
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chain = pamh->chains[PAM_AUTH];
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break;
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case PAM_SM_ACCT_MGMT:
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chain = pamh->chains[PAM_ACCOUNT];
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break;
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case PAM_SM_OPEN_SESSION:
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case PAM_SM_CLOSE_SESSION:
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chain = pamh->chains[PAM_SESSION];
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break;
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case PAM_SM_CHAUTHTOK:
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chain = pamh->chains[PAM_PASSWORD];
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break;
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default:
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RETURNC(PAM_SYSTEM_ERR);
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}
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/* execute */
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err = PAM_SUCCESS;
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fail = nsuccess = 0;
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for (; chain != NULL; chain = chain->next) {
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if (chain->module->func[primitive] == NULL) {
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openpam_log(PAM_LOG_ERROR, "%s: no %s()",
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chain->module->path, pam_sm_func_name[primitive]);
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r = PAM_SYSTEM_ERR;
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} else {
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pamh->primitive = primitive;
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pamh->current = chain;
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debug = (openpam_get_option(pamh, "debug") != NULL);
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if (debug)
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++openpam_debug;
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openpam_log(PAM_LOG_LIBDEBUG, "calling %s() in %s",
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pam_sm_func_name[primitive], chain->module->path);
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r = (chain->module->func[primitive])(pamh, flags,
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chain->optc, (const char **)chain->optv);
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pamh->current = NULL;
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openpam_log(PAM_LOG_LIBDEBUG, "%s: %s(): %s",
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chain->module->path, pam_sm_func_name[primitive],
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pam_strerror(pamh, r));
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if (debug)
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--openpam_debug;
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}
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if (r == PAM_IGNORE)
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continue;
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if (r == PAM_SUCCESS) {
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++nsuccess;
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/*
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* For pam_setcred() and pam_chauthtok() with the
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* PAM_PRELIM_CHECK flag, treat "sufficient" as
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* "optional".
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*/
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if ((chain->flag == PAM_SUFFICIENT ||
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chain->flag == PAM_BINDING) && !fail &&
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primitive != PAM_SM_SETCRED &&
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!(primitive == PAM_SM_CHAUTHTOK &&
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(flags & PAM_PRELIM_CHECK)))
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break;
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continue;
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}
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openpam_check_error_code(primitive, r);
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/*
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* Record the return code from the first module to
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* fail. If a required module fails, record the
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* return code from the first required module to fail.
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*/
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if (err == PAM_SUCCESS)
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err = r;
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if ((chain->flag == PAM_REQUIRED ||
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chain->flag == PAM_BINDING) && !fail) {
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openpam_log(PAM_LOG_LIBDEBUG, "required module failed");
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fail = 1;
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err = r;
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}
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/*
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* If a requisite module fails, terminate the chain
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* immediately.
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*/
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if (chain->flag == PAM_REQUISITE) {
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openpam_log(PAM_LOG_LIBDEBUG, "requisite module failed");
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fail = 1;
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break;
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}
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}
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if (!fail && err != PAM_NEW_AUTHTOK_REQD)
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err = PAM_SUCCESS;
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/*
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* Require the chain to be non-empty, and at least one module
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* in the chain to be successful, so that we don't fail open.
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*/
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if (err == PAM_SUCCESS && nsuccess < 1) {
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openpam_log(PAM_LOG_ERROR,
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"all modules were unsuccessful for %s()",
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pam_sm_func_name[primitive]);
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err = PAM_SYSTEM_ERR;
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}
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RETURNC(err);
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}
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#if !defined(OPENPAM_RELAX_CHECKS)
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static void
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openpam_check_error_code(int primitive, int r)
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{
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/* common error codes */
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if (r == PAM_SUCCESS ||
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r == PAM_SYSTEM_ERR ||
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r == PAM_SERVICE_ERR ||
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r == PAM_BUF_ERR ||
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r == PAM_CONV_ERR ||
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r == PAM_PERM_DENIED ||
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r == PAM_ABORT)
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return;
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/* specific error codes */
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switch (primitive) {
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case PAM_SM_AUTHENTICATE:
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if (r == PAM_AUTH_ERR ||
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r == PAM_CRED_INSUFFICIENT ||
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r == PAM_AUTHINFO_UNAVAIL ||
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r == PAM_USER_UNKNOWN ||
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r == PAM_MAXTRIES)
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return;
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break;
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case PAM_SM_SETCRED:
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if (r == PAM_CRED_UNAVAIL ||
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r == PAM_CRED_EXPIRED ||
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r == PAM_USER_UNKNOWN ||
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r == PAM_CRED_ERR)
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return;
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break;
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case PAM_SM_ACCT_MGMT:
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if (r == PAM_USER_UNKNOWN ||
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r == PAM_AUTH_ERR ||
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r == PAM_NEW_AUTHTOK_REQD ||
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r == PAM_ACCT_EXPIRED)
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return;
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break;
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case PAM_SM_OPEN_SESSION:
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case PAM_SM_CLOSE_SESSION:
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if (r == PAM_SESSION_ERR)
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return;
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break;
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case PAM_SM_CHAUTHTOK:
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if (r == PAM_PERM_DENIED ||
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r == PAM_AUTHTOK_ERR ||
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r == PAM_AUTHTOK_RECOVERY_ERR ||
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r == PAM_AUTHTOK_LOCK_BUSY ||
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r == PAM_AUTHTOK_DISABLE_AGING ||
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r == PAM_TRY_AGAIN)
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return;
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break;
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}
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openpam_log(PAM_LOG_ERROR, "%s(): unexpected return value %d",
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pam_sm_func_name[primitive], r);
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}
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#endif /* !defined(OPENPAM_RELAX_CHECKS) */
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/*
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* NODOC
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*
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* Error codes:
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*/
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