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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
/*
* pamptpreop.c - bind pre-operation plugin for Pass Through Authentication to PAM
*
*/
#include "pam_passthru.h"
static Slapi_PluginDesc pdesc = { "pam_passthruauth", PLUGIN_MAGIC_VENDOR_STR, PRODUCTTEXT,
"PAM pass through authentication plugin" };
static void * pam_passthruauth_plugin_identity = NULL;
/*
* function prototypes
*/
static int pam_passthru_bindpreop( Slapi_PBlock *pb );
static int pam_passthru_bindpreop_start( Slapi_PBlock *pb );
static int pam_passthru_bindpreop_close( Slapi_PBlock *pb );
/*
** Plugin identity mgmt
*/
void pam_passthruauth_set_plugin_identity(void * identity)
{
pam_passthruauth_plugin_identity=identity;
}
void * pam_passthruauth_get_plugin_identity()
{
return pam_passthruauth_plugin_identity;
}
/*
* Plugin initialization function (which must be listed in the appropriate
* slapd config file).
*/
int
pam_passthruauth_init( Slapi_PBlock *pb )
{
PAM_PASSTHRU_ASSERT( pb != NULL );
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"=> pam_passthruauth_init\n" );
if ( slapi_pblock_set( pb, SLAPI_PLUGIN_VERSION,
(void *)SLAPI_PLUGIN_VERSION_01 ) != 0
|| slapi_pblock_set( pb, SLAPI_PLUGIN_DESCRIPTION,
(void *)&pdesc ) != 0
|| slapi_pblock_set( pb, SLAPI_PLUGIN_START_FN,
(void *)pam_passthru_bindpreop_start ) != 0
|| slapi_pblock_set( pb, SLAPI_PLUGIN_PRE_BIND_FN,
(void *)pam_passthru_bindpreop ) != 0
|| slapi_pblock_set( pb, SLAPI_PLUGIN_CLOSE_FN,
(void *)pam_passthru_bindpreop_close ) != 0 ) {
slapi_log_error( SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"pam_passthruauth_init failed\n" );
return( -1 );
}
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= pam_passthruauth_init succeeded\n" );
return( 0 );
}
/*
* pam_passthru_bindpreop_start() is called before the directory server
* is fully up. We parse our configuration and initialize any mutexes, etc.
*/
static int
pam_passthru_bindpreop_start( Slapi_PBlock *pb )
{
int rc;
Slapi_Entry *config_e = NULL; /* entry containing plugin config */
PAM_PASSTHRU_ASSERT( pb != NULL );
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"=> pam_passthru_bindpreop_start\n" );
if ( slapi_pblock_get( pb, SLAPI_ADD_ENTRY, &config_e ) != 0 ) {
slapi_log_error( SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"missing config entry\n" );
return( -1 );
}
if (( rc = pam_passthru_config( config_e )) != LDAP_SUCCESS ) {
slapi_log_error( SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"configuration failed (%s)\n", ldap_err2string( rc ));
return( -1 );
}
if (( rc = pam_passthru_pam_init()) != LDAP_SUCCESS ) {
slapi_log_error( SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"could not initialize PAM subsystem (%d)\n", rc);
return( -1 );
}
return( 0 );
}
/*
* Called right before the Directory Server shuts down.
*/
static int
pam_passthru_bindpreop_close( Slapi_PBlock *pb )
{
PAM_PASSTHRU_ASSERT( pb != NULL );
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"=> pam_passthru_bindpreop_close\n" );
return( 0 );
}
static int
pam_passthru_bindpreop( Slapi_PBlock *pb )
{
int rc, method;
char *normbinddn, *errmsg = NULL;
Pam_PassthruConfig *cfg;
struct berval *creds;
int retcode = PAM_PASSTHRU_OP_NOT_HANDLED;
PAM_PASSTHRU_ASSERT( pb != NULL );
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"=> pam_passthru_bindpreop\n" );
/*
* retrieve parameters for bind operation
*/
if ( slapi_pblock_get( pb, SLAPI_BIND_METHOD, &method ) != 0 ||
slapi_pblock_get( pb, SLAPI_BIND_TARGET, &normbinddn ) != 0 ||
slapi_pblock_get( pb, SLAPI_BIND_CREDENTIALS, &creds ) != 0 ) {
slapi_log_error( SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= not handled (unable to retrieve bind parameters)\n" );
return retcode;
}
/*
* We only handle simple bind requests that include non-NULL binddn and
* credentials. Let the Directory Server itself handle everything else.
*/
if ( method != LDAP_AUTH_SIMPLE || *normbinddn == '\0' ||
creds->bv_len == 0 ) {
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= not handled (not simple bind or NULL dn/credentials)\n" );
return retcode;
}
/* get the config */
cfg = pam_passthru_get_config();
/* don't lock mutex here - simple integer access - assume atomic */
if (cfg->pamptconfig_secure) { /* is a secure connection required? */
int is_ssl = 0;
slapi_pblock_get(pb, SLAPI_CONN_IS_SSL_SESSION, &is_ssl);
if (!is_ssl) {
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= connection not secure (secure connection required; check config)");
return retcode;
}
}
/*
* Check to see if the target DN is one we should "pass through" to
* PAM
*/
if ( pam_passthru_check_suffix( cfg, normbinddn ) != LDAP_SUCCESS ) {
slapi_log_error( SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= not handled (not one of our suffixes)\n" );
return retcode;
}
/*
* We are now committed to handling this bind request.
* Chain it off to PAM
*/
rc = pam_passthru_do_pam_auth(pb, cfg);
/*
* If bind succeeded, change authentication information associated
* with this connection.
*/
if (rc == LDAP_SUCCESS) {
char *ndn = slapi_ch_strdup(normbinddn);
if ((slapi_pblock_set(pb, SLAPI_CONN_DN, ndn) != 0) ||
(slapi_pblock_set(pb, SLAPI_CONN_AUTHMETHOD,
SLAPD_AUTH_SIMPLE) != 0)) {
slapi_ch_free_string(&ndn);
rc = LDAP_OPERATIONS_ERROR;
errmsg = "unable to set connection DN or AUTHTYPE";
slapi_log_error(SLAPI_LOG_FATAL, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"%s\n", errmsg);
} else {
LDAPControl **reqctrls = NULL;
slapi_pblock_get(pb, SLAPI_REQCONTROLS, &reqctrls);
if (slapi_control_present(reqctrls, LDAP_CONTROL_AUTH_REQUEST, NULL, NULL)) {
slapi_add_auth_response_control(pb, ndn);
}
}
}
if (rc == LDAP_SUCCESS) {
/* we are handling the result */
slapi_send_ldap_result(pb, rc, NULL, errmsg, 0, NULL);
/* tell bind code we handled the result */
retcode = PAM_PASSTHRU_OP_HANDLED;
} else if (!cfg->pamptconfig_fallback) {
/* tell bind code we already sent back the error result in pam_ptimpl.c */
retcode = PAM_PASSTHRU_OP_HANDLED;
}
slapi_log_error(SLAPI_LOG_PLUGIN, PAM_PASSTHRU_PLUGIN_SUBSYSTEM,
"<= handled (error %d - %s)\n", rc, ldap_err2string(rc));
return retcode;
}
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