/*
* rlm_eap.c contains handles that are called from modules.
*
* Version: $Id: rlm_eap.c,v 1.26.2.1.2.1 2006/02/06 16:23:52 nbk Exp $
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright 2000-2003 The FreeRADIUS server project
* Copyright 2001 hereUare Communications, Inc. <raghud@hereuare.com>
* Copyright 2003 Alan DeKok <aland@freeradius.org>
*/
#include "autoconf.h"
#include "rlm_eap.h"
#include "modules.h"
static const char rcsid[] = "$Id: rlm_eap.c,v 1.26.2.1.2.1 2006/02/06 16:23:52 nbk Exp $";
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" },
{ 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));
if (inst->default_eap_type_name) free(inst->default_eap_type_name);
free(inst);
return 0;
}
/*
* Compare two handlers.
*/
static int eap_handler_cmp(const void *a, const void *b)
{
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;
if (one->src_ipaddr < two->src_ipaddr) return -1;
if (one->src_ipaddr > two->src_ipaddr) return +1;
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 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;
}
/* 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)) {
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|L_CONS, "rlm_eap: Unknown EAP type %s",
auth_type);
eap_detach(inst);
return -1;
}
/*
* 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.
*/
/* Generate a state key, specific to eap */
generate_key();
/*
* 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_attribute(request->packet->vps);
if (eap_packet == NULL) {
radlog(L_ERR, "rlm_eap: 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) {
DEBUG2(" rlm_eap: Failed in handler");
return RLM_MODULE_INVALID;
}
/*
* If it's a recursive request, then disallow
* TLS, TTLS, and PEAP, inside of the TLS tunnel.
*/
if ((request->options & RAD_REQUEST_OPTION_FAKE_REQUEST) != 0) {
switch(handler->eap_ds->response->type.type) {
case PW_EAP_TLS:
case PW_EAP_TTLS:
case PW_EAP_PEAP:
DEBUG2(" rlm_eap: Unable to tunnel TLS inside of TLS");
eap_fail(handler);
eap_handler_free(handler);
return RLM_MODULE_INVALID;
break;
default: /* It may be OK, allow it to proceed */
break;
}
}
/*
* 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);
DEBUG2(" rlm_eap: 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) {
DEBUG2(" 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, 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, 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);
}
}
/*
* Delete the "proxied to" attribute, as it's
* set to 127.0.0.1 for tunneled requests, and
* we don't want to tell the world that...
*/
pairdelete(&request->proxy->vps, PW_FREERADIUS_PROXIED_TO);
DEBUG2(" Tunneled session will be proxied. Not doing EAP.");
return RLM_MODULE_HANDLED;
}
/*
* We are done, wrap the EAP-request in RADIUS to send
* with all other required radius attributes
*/
rcode = eap_compose(handler);
/*
* Add to the list only if it is EAP-Request, OR if
* it's LEAP, and a response.
*/
if ((handler->eap_ds->request->code == PW_EAP_REQUEST) &&
(handler->eap_ds->request->type.type >= PW_EAP_MD5)) {
eaplist_add(inst, handler);
/*
* LEAP is a little different. At Stage 4,
* it sends an EAP-Success message, but we still
* need to keep the State attribute & session
* data structure around for the AP Challenge.
*
* At stage 6, LEAP sends an EAP-Response, which
* isn't put into the list.
*/
} else if ((handler->eap_ds->response->code == PW_EAP_RESPONSE) &&
(handler->eap_ds->response->type.type == PW_EAP_LEAP) &&
(handler->eap_ds->request->code == PW_EAP_SUCCESS) &&
(handler->eap_ds->request->type.type == 0)) {
eaplist_add(inst, handler);
} else {
DEBUG2(" rlm_eap: Freeing handler");
/* handler is not required any more, free it now */
eap_handler_free(handler);
}
/*
* If it's an Access-Accept, RFC 2869, Section 2.3.1
* says that we MUST include a User-Name attribute in the
* Access-Accept.
*/
if ((request->reply->code == PW_AUTHENTICATION_ACK) &&
request->username) {
VALUE_PAIR *vp;
/*
* Doesn't exist, add it in.
*/
vp = pairfind(request->reply->vps, PW_USER_NAME);
if (!vp) {
vp = pairmake("User-Name", request->username->strvalue,
T_OP_EQ);
rad_assert(vp != NULL);
pairadd(&(request->reply->vps), vp);
}
/*
* Cisco AP1230 has a bug and needs a zero
* terminated string in Access-Accept.
*/
if ((inst->cisco_accounting_username_bug) &&
(vp->length < (int) sizeof(vp->strvalue))) {
vp->strvalue[vp->length] = '\0';
vp->length++;
}
}
return rcode;
}
/*
* EAP authorization DEPENDS on other rlm authorizations,
* to check for user existance & get their configured values.
* It Handles EAP-START Messages, User-Name initilization.
*/
static int eap_authorize(void *instance, REQUEST *request)
{
rlm_eap_t *inst;
int status;
VALUE_PAIR *vp;
inst = (rlm_eap_t *)instance;
/*
* We don't do authorization again, once we've seen the
* proxy reply (or the proxied packet)
*/
if (request->proxy != NULL)
return RLM_MODULE_NOOP;
/*
* For EAP_START, send Access-Challenge with EAP Identity
* request. even when we have to proxy this request
*
* RFC 2869, Section 2.3.1 notes that the "domain" of the
* user, (i.e. where to proxy him) comes from the EAP-Identity,
* so we CANNOT proxy the user, until we know his identity.
*
* We therefore send an EAP Identity request.
*/
status = eap_start(inst, request);
switch(status) {
case EAP_NOOP:
return RLM_MODULE_NOOP;
case EAP_FAIL:
return RLM_MODULE_FAIL;
case EAP_FOUND:
return RLM_MODULE_HANDLED;
case EAP_NOTFOUND:
default:
break;
}
/*
* RFC 2869, Section 2.3.1. If a NAS sends an EAP-Identity,
* it MUST copy the identity into the User-Name attribute.
*
* But we don't worry about that too much. We depend on
* each EAP sub-module to look for handler->request->username,
* and to get excited if it doesn't appear.
*/
vp = pairfind(request->config_items, PW_AUTH_TYPE);
if ((!vp) ||
(vp->lvalue != PW_AUTHTYPE_REJECT)) {
vp = pairmake("Auth-Type", "EAP", T_OP_EQ);
if (!vp) {
return RLM_MODULE_FAIL;
}
pairadd(&request->config_items, vp);
}
return RLM_MODULE_UPDATED;
}
/*
* If we're proxying EAP, then there may be magic we need
* to do.
*/
static int eap_post_proxy(void *inst, REQUEST *request)
{
int i, len;
VALUE_PAIR *vp;
EAP_HANDLER *handler;
/*
* If there was a handler associated with this request,
* then it's a tunneled request which was proxied...
*/
handler = request_data_get(request, inst, REQUEST_DATA_EAP_HANDLER);
if (handler != NULL) {
int rcode;
eap_tunnel_data_t *data;
/*
* Grab the tunnel callbacks from the request.
*/
data = (eap_tunnel_data_t *) request_data_get(request,
request->proxy,
REQUEST_DATA_EAP_TUNNEL_CALLBACK);
if (!data) {
radlog(L_ERR, "rlm_eap: Failed to retrieve callback for tunneled session!");
eap_handler_free(handler);
return RLM_MODULE_FAIL;
}
/*
* Do the callback...
*/
rcode = data->callback(handler, data->tls_session);
free(data);
if (rcode == 0) {
eap_fail(handler);
eap_handler_free(handler);
return RLM_MODULE_REJECT;
}
/*
* We are done, wrap the EAP-request in RADIUS to send
* with all other required radius attributes
*/
rcode = eap_compose(handler);
/*
* Add to the list only if it is EAP-Request, OR if
* it's LEAP, and a response.
*/
if ((handler->eap_ds->request->code == PW_EAP_REQUEST) &&
(handler->eap_ds->request->type.type >= PW_EAP_MD5)) {
eaplist_add(inst, handler);
} else { /* couldn't have been LEAP, there's no tunnel */
DEBUG2(" rlm_eap: Freeing handler");
/* handler is not required any more, free it now */
eap_handler_free(handler);
}
/*
* If it's an Access-Accept, RFC 2869, Section 2.3.1
* says that we MUST include a User-Name attribute in the
* Access-Accept.
*/
if ((request->reply->code == PW_AUTHENTICATION_ACK) &&
request->username) {
/*
* Doesn't exist, add it in.
*/
vp = pairfind(request->reply->vps, PW_USER_NAME);
if (!vp) {
vp = pairmake("User-Name", request->username->strvalue,
T_OP_EQ);
rad_assert(vp != NULL);
pairadd(&(request->reply->vps), vp);
}
}
return RLM_MODULE_OK;
}
/*
* There may be more than one Cisco-AVPair.
* Ensure we find the one with the LEAP attribute.
*/
vp = request->proxy_reply->vps;
for (;;) {
/*
* Hmm... there's got to be a better way to
* discover codes for vendor attributes.
*
* This is vendor Cisco (9), Cisco-AVPair
* attribute (1)
*/
vp = pairfind(vp, (9 << 16) | 1);
if (!vp) {
return RLM_MODULE_NOOP;
}
/*
* If it's "leap:session-key", then stop.
*
* The format is VERY specific!
*/
if (strncasecmp(vp->strvalue, "leap:session-key=", 17) == 0) {
break;
}
/*
* Not this AV-pair. Go to the next one.
*/
vp = vp->next;
}
/*
* The format is very specific.
*/
if (vp->length != 17 + 34) {
DEBUG2(" rlm_eap: Cisco-AVPair with leap:session-key has incorrect length %d: Expected %d",
vp->length, 17 + 34);
return RLM_MODULE_NOOP;
}
/*
* Decrypt the session key, using the proxy data.
*/
i = 34; /* starts off with 34 octets */
len = rad_tunnel_pwdecode(vp->strvalue + 17, &i,
request->proxysecret,
request->proxy->vector);
/*
* FIXME: Assert that i == 16.
*/
/*
* Encrypt the session key again, using the request data.
*/
rad_tunnel_pwencode(vp->strvalue + 17, &len,
request->secret,
request->packet->vector);
return RLM_MODULE_UPDATED;
}
/*
* The module name should be the only globally exported symbol.
* That is, everything else should be 'static'.
*/
module_t rlm_eap = {
"eap",
RLM_TYPE_THREAD_SAFE, /* type */
NULL, /* initialization */
eap_instantiate, /* instantiation */
{
eap_authenticate, /* authentication */
eap_authorize, /* authorization */
NULL, /* preaccounting */
NULL, /* accounting */
NULL, /* checksimul */
NULL, /* pre-proxy */
eap_post_proxy, /* post-proxy */
NULL /* post-auth */
},
eap_detach, /* detach */
NULL, /* destroy */
};
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