rlm_eap.c

freeradius-server-2.1.3.tar.gz安装源文件

/*
 * rlm_eap.c  contains handles that are called from modules.
 *
 * Version:     $Id$
 *
 *   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; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * Copyright 2000-2003,2006  The FreeRADIUS server project
 * Copyright 2001  hereUare Communications, Inc. <[e-mail]>
 * Copyright 2003  Alan DeKok <[e-mail]>
 */

#include <freeradius-devel/ident.h>
RCSID("$Id$")

#include <freeradius-devel/radiusd.h>
#include <freeradius-devel/modules.h>

#include "rlm_eap.h"

static const CONF_PARSER module_config[] = {
	{ "default_eap_type", PW_TYPE_STRING_PTR,
	  offsetof(rlm_eap_t, default_eap_type_name), NULL, "md5" },
	{ "timer_expire", PW_TYPE_INTEGER,
	  offsetof(rlm_eap_t, timer_limit), NULL, "60"},
	{ "ignore_unknown_eap_types", PW_TYPE_BOOLEAN,
	  offsetof(rlm_eap_t, ignore_unknown_eap_types), NULL, "no" },
	{ "cisco_accounting_username_bug", PW_TYPE_BOOLEAN,
	  offsetof(rlm_eap_t, cisco_accounting_username_bug), NULL, "no" },
	{ "max_sessions", PW_TYPE_INTEGER,
	  offsetof(rlm_eap_t, max_sessions), NULL, "2048"},

 	{ NULL, -1, 0, NULL, NULL }           /* end the list */
};

/*
 * delete all the allocated space by eap module
 */
static int eap_detach(void *instance)
{
	rlm_eap_t *inst;
	int i;

	inst = (rlm_eap_t *)instance;

	rbtree_free(inst->session_tree);
	inst->session_tree = NULL;
	eaplist_free(inst);

	for (i = 0; i < PW_EAP_MAX_TYPES; i++) {
		if (inst->types[i]) eaptype_free(inst->types[i]);
		inst->types[i] = NULL;
	}

	pthread_mutex_destroy(&(inst->session_mutex));

	free(inst);

	return 0;
}


/*
 *	Compare two handlers.
 */
static int eap_handler_cmp(const void *a, const void *b)
{
	int rcode;
	const EAP_HANDLER *one = a;
	const EAP_HANDLER *two = b;

	if (one->eap_id < two->eap_id) return -1;
	if (one->eap_id > two->eap_id) return +1;

	rcode = fr_ipaddr_cmp(&one->src_ipaddr, &two->src_ipaddr);
	if (rcode != 0) return rcode;

	return memcmp(one->state, two->state, sizeof(one->state));
}


/*
 * read the config section and load all the eap authentication types present.
 */
static int eap_instantiate(CONF_SECTION *cs, void **instance)
{
	int		i, eap_type;
	int		num_types;
	CONF_SECTION 	*scs;
	rlm_eap_t	*inst;

	inst = (rlm_eap_t *) malloc(sizeof(*inst));
	if (!inst) {
		return -1;
	}
	memset(inst, 0, sizeof(*inst));
	if (cf_section_parse(cs, inst, module_config) < 0) {
		eap_detach(inst);
		return -1;
	}

	/*
	 *	Create our own random pool.
	 */
	for (i = 0; i < 256; i++) {
		inst->rand_pool.randrsl[i] = fr_rand();
	}
	fr_randinit(&inst->rand_pool, 1);
	inst->rand_pool.randcnt = 0;

	inst->xlat_name = cf_section_name2(cs);
	if (!inst->xlat_name) inst->xlat_name = "EAP";

	/* Load all the configured EAP-Types */
	num_types = 0;
	for(scs=cf_subsection_find_next(cs, NULL, NULL);
		scs != NULL;
		scs=cf_subsection_find_next(cs, scs, NULL)) {

		const char	*auth_type;

		auth_type = cf_section_name1(scs);

		if (!auth_type)  continue;

		eap_type = eaptype_name2type(auth_type);
		if (eap_type < 0) {
			radlog(L_ERR, "rlm_eap: Unknown EAP type %s",
			       auth_type);
			eap_detach(inst);
			return -1;
		}

#ifndef HAVE_OPENSSL_SSL_H
		/*
		 *	This allows the default configuration to be
		 *	shipped with EAP-TLS, etc. enabled.  If the
		 *	system doesn't have OpenSSL, they will be
		 *	ignored.
		 *
		 *	If the system does have OpenSSL, then this
		 *	code will not be used.  The administrator will
		 *	then have to delete the tls,
		 *	etc. configurations from eap.conf in order to
		 *	have EAP without the TLS types.
		 */
		if ((eap_type == PW_EAP_TLS) ||
		    (eap_type == PW_EAP_TTLS) ||
		    (eap_type == PW_EAP_PEAP)) {
			DEBUG2("Ignoring EAP-Type/%s because we do not have OpenSSL support.", auth_type);
			continue;
		}
#endif

		/*
		 *	If we're asked to load TTLS or PEAP, ensure
		 *	that we've first loaded TLS.
		 */
		if (((eap_type == PW_EAP_TTLS) ||
		     (eap_type == PW_EAP_PEAP)) &&
		    (inst->types[PW_EAP_TLS] == NULL)) {
			radlog(L_ERR, "rlm_eap: Unable to load EAP-Type/%s, as EAP-Type/TLS is required first.",
			       auth_type);
			return -1;
		}

		/*
		 *	Load the type.
		 */
		if (eaptype_load(&inst->types[eap_type], eap_type, scs) < 0) {
			eap_detach(inst);
			return -1;
		}

		num_types++;	/* successfully loaded one more types */
	}

	if (num_types == 0) {
		radlog(L_ERR|L_CONS, "rlm_eap: No EAP type configured, module cannot do anything.");
		eap_detach(inst);
		return -1;
	}

	/*
	 *	Ensure that the default EAP type is loaded.
	 */
	eap_type = eaptype_name2type(inst->default_eap_type_name);
	if (eap_type < 0) {
		radlog(L_ERR|L_CONS, "rlm_eap: Unknown default EAP type %s",
		       inst->default_eap_type_name);
		eap_detach(inst);
		return -1;
	}

	if (inst->types[eap_type] == NULL) {
		radlog(L_ERR|L_CONS, "rlm_eap: No such sub-type for default EAP type %s",
		       inst->default_eap_type_name);
		eap_detach(inst);
		return -1;
	}
	inst->default_eap_type = eap_type; /* save the numerical type */

	/*
	 *	List of sessions are set to NULL by the memset
	 *	of 'inst', above.
	 */

	/*
	 *	Lookup sessions in the tree.  We don't free them in
	 *	the tree, as that's taken care of elsewhere...
	 */
	inst->session_tree = rbtree_create(eap_handler_cmp, NULL, 0);
	if (!inst->session_tree) {
		radlog(L_ERR|L_CONS, "rlm_eap: Cannot initialize tree");
		eap_detach(inst);
		return -1;
	}

	pthread_mutex_init(&(inst->session_mutex), NULL);

	*instance = inst;
	return 0;
}


/*
 *	For backwards compatibility.
 */
static int eap_authenticate(void *instance, REQUEST *request)
{
	rlm_eap_t	*inst;
	EAP_HANDLER	*handler;
	eap_packet_t	*eap_packet;
	int		rcode;

	inst = (rlm_eap_t *) instance;

	/*
	 *	Get the eap packet  to start with
	 */
	eap_packet = eap_vp2packet(request->packet->vps);
	if (eap_packet == NULL) {
		radlog_request(L_ERR, 0, request, "Malformed EAP Message");
		return RLM_MODULE_FAIL;
	}

	/*
	 *	Create the eap handler.  The eap_packet will end up being
	 *	"swallowed" into the handler, so we can't access it after
	 *	this call.
	 */
	handler = eap_handler(inst, &eap_packet, request);
	if (handler == NULL) {
		RDEBUG2("Failed in handler");
		return RLM_MODULE_INVALID;
	}

	/*
	 *	Select the appropriate eap_type or default to the
	 *	configured one
	 */
	rcode = eaptype_select(inst, handler);

	/*
	 *	If it failed, die.
	 */
	if (rcode == EAP_INVALID) {
		eap_fail(handler);
		eap_handler_free(handler);
		RDEBUG2("Failed in EAP select");
		return RLM_MODULE_INVALID;
	}

	/*
	 *	If we're doing horrible tunneling work, remember it.
	 */
	if ((request->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) {
		RDEBUG2("  Not-EAP proxy set.  Not composing EAP");
		/*
		 *	Add the handle to the proxied list, so that we
		 *	can retrieve it in the post-proxy stage, and
		 *	send a response.
		 */
		rcode = request_data_add(request,
					 inst, REQUEST_DATA_EAP_HANDLER,
					 handler,
					 (void *) eap_handler_free);
		rad_assert(rcode == 0);

		return RLM_MODULE_HANDLED;
	}


	/*
	 *	Maybe the request was marked to be proxied.  If so,
	 *	proxy it.
	 */
	if (request->proxy != NULL) {
		VALUE_PAIR *vp = NULL;

		rad_assert(request->proxy_reply == NULL);

		/*
		 *	Add the handle to the proxied list, so that we
		 *	can retrieve it in the post-proxy stage, and
		 *	send a response.
		 */
		rcode = request_data_add(request,
					 inst, REQUEST_DATA_EAP_HANDLER,
					 handler,
					 (void *) eap_handler_free);
		rad_assert(rcode == 0);

		/*
		 *	Some simple sanity checks.  These should really
		 *	be handled by the radius library...
		 */
		vp = pairfind(request->proxy->vps, PW_EAP_MESSAGE);
		if (vp) {
			vp = pairfind(request->proxy->vps, PW_MESSAGE_AUTHENTICATOR);
			if (!vp) {
				vp = pairmake("Message-Authenticator",
					      "0x00", T_OP_EQ);
				rad_assert(vp != NULL);
				pairadd(&(request->proxy->vps), vp);
			}
		}

		/*