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Diffstat (limited to '')
-rw-r--r-- | src/modules/rlm_eap/rlm_eap.c | 883 |
1 files changed, 883 insertions, 0 deletions
diff --git a/src/modules/rlm_eap/rlm_eap.c b/src/modules/rlm_eap/rlm_eap.c new file mode 100644 index 0000000..18eb1c4 --- /dev/null +++ b/src/modules/rlm_eap/rlm_eap.c @@ -0,0 +1,883 @@ +/* + * This program is 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 + */ + +/** + * $Id$ + * @file rlm_eap.c + * @brief Implements the EAP framework. + * + * @copyright 2000-2003,2006 The FreeRADIUS server project + * @copyright 2001 hereUare Communications, Inc. <raghud@hereuare.com> + * @copyright 2003 Alan DeKok <aland@freeradius.org> + */ +RCSID("$Id$") + +#include <freeradius-devel/radiusd.h> +#include <freeradius-devel/modules.h> + +#include "rlm_eap.h" + +#include <sys/stat.h> + +static const CONF_PARSER module_config[] = { + { "default_eap_type", FR_CONF_OFFSET(PW_TYPE_STRING, rlm_eap_t, default_method_name), "md5" }, + { "timer_expire", FR_CONF_OFFSET(PW_TYPE_INTEGER, rlm_eap_t, timer_limit), "60" }, + { "max_eap_type", FR_CONF_OFFSET(PW_TYPE_INTEGER, rlm_eap_t, max_eap_type), "52" }, + { "ignore_unknown_eap_types", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_eap_t, ignore_unknown_types), "no" }, + { "cisco_accounting_username_bug", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_eap_t, mod_accounting_username_bug), "no" }, + { "allow_empty_identities", FR_CONF_OFFSET(PW_TYPE_BOOLEAN, rlm_eap_t, allow_empty_identities), NULL }, + { "max_sessions", FR_CONF_OFFSET(PW_TYPE_INTEGER, rlm_eap_t, max_sessions), "2048" }, + { "dedup_key", FR_CONF_OFFSET(PW_TYPE_STRING, rlm_eap_t, dedup_key), "" }, + CONF_PARSER_TERMINATOR +}; + +/* + * delete all the allocated space by eap module + */ +static int mod_detach(void *instance) +{ + rlm_eap_t *inst; + + inst = (rlm_eap_t *)instance; + +#ifdef HAVE_PTHREAD_H + pthread_mutex_destroy(&(inst->session_mutex)); +#endif + + rbtree_free(inst->session_tree); + inst->session_tree = NULL; + eaplist_free(inst); + + return 0; +} + + +/* + * Compare two handlers. + */ +static int eap_handler_cmp(void const *a, void const *b) +{ + int rcode; + eap_handler_t const *one = a; + eap_handler_t const *two = b; + + if (one->eap_id < two->eap_id) return -1; + if (one->eap_id > two->eap_id) return +1; + + rcode = memcmp(one->state, two->state, sizeof(one->state)); + if (rcode != 0) return rcode; + + /* + * As of 2.1.8, we don't key off of source IP. This + * a NAS to send packets load-balanced (or fail-over) + * across multiple intermediate proxies, and still have + * EAP work. + */ + if (fr_ipaddr_cmp(&one->src_ipaddr, &two->src_ipaddr) != 0) { + char src1[64], src2[64]; + + fr_ntop(src1, sizeof(src1), &one->src_ipaddr); + fr_ntop(src2, sizeof(src2), &two->src_ipaddr); + + RATE_LIMIT(WARN("EAP packets for one session are arriving from two different upstream" + "servers (%s and %s). Has there been a proxy fail-over?", + src1, src2)); + } + + return 0; +} + +/* + * Compare two handlers by dedup key + */ +static int CC_HINT(nonnull) dedup_cmp(void const *a, void const *b) +{ + eap_handler_t const *one = a; + eap_handler_t const *two = b; + + if (!one->dedup && two->dedup) return -1; + if (one->dedup && !two->dedup) return +1; + + if (!one->dedup && !two->dedup) return 0; + + return strcmp(one->dedup, two->dedup); +} + +/* + * read the config section and load all the eap authentication types present. + */ +static int mod_instantiate(CONF_SECTION *cs, void *instance) +{ + int i, ret; + eap_type_t method; + int num_methods; + CONF_SECTION *scs; + rlm_eap_t *inst = instance; + + /* + * 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"; + + if (!dict_valbyname(PW_AUTH_TYPE, 0, inst->xlat_name)) { + cf_log_err_cs(cs, "Failed to find 'Auth-Type %s' section. Cannot authenticate users.", + inst->xlat_name); + return -1; + } + + /* Load all the configured EAP-Types */ + num_methods = 0; + for(scs = cf_subsection_find_next(cs, NULL, NULL); + scs != NULL; + scs = cf_subsection_find_next(cs, scs, NULL)) { + char const *name; + + name = cf_section_name1(scs); + if (!name) continue; + + if (!strcmp(name, TLS_CONFIG_SECTION)) continue; + + /* + * Don't break configurations for lazy people who still have LEAP enabled. + */ + if (!strcmp(name, "leap")) { + WARN("rlm_eap (%s): Ignoring EAP method 'leap', because it is no longer supported", + inst->xlat_name); + continue; + } + + /* + * Easier sometimes than commenting out blocks, + * or deleting blocks. + */ + if (!strcmp(name, "disable")) continue; + + method = eap_name2type(name); + if (method == PW_EAP_INVALID) { + cf_log_err_cs(cs, "No dictionary definition for EAP method %s", name); + return -1; + } + + if ((method < PW_EAP_MD5) || (method >= PW_EAP_MAX_TYPES)) { + cf_log_err_cs(cs, "Invalid EAP method %s (unsupported)", name); + return -1; + } + +#if !defined(HAVE_OPENSSL_SSL_H) || !defined(HAVE_LIBSSL) + /* + * 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. + */ + switch (method) { + case PW_EAP_FAST: + case PW_EAP_TLS: + case PW_EAP_TTLS: + case PW_EAP_PEAP: + case PW_EAP_PWD: + case PW_EAP_TEAP: + WARN("rlm_eap (%s): Ignoring EAP method %s because we don't have OpenSSL support", + inst->xlat_name, name); + continue; + + default: + break; + } +#endif + + /* + * Load the type. + */ + ret = eap_module_instantiate(inst, &inst->methods[method], method, scs); + + (void) talloc_get_type_abort(inst->methods[method], eap_module_t); + + if (ret < 0) { + (void) talloc_steal(inst, inst->methods[method]); + return -1; + } + + (void) talloc_steal(inst, inst->methods[method]); + num_methods++; /* successfully loaded one more methods */ + } + + if (num_methods == 0) { + cf_log_err_cs(cs, "No EAP method configured, module cannot do anything"); + return -1; + } + + /* + * Ensure that the default EAP type is loaded. + */ + method = eap_name2type(inst->default_method_name); + if (method == PW_EAP_INVALID) { + cf_log_err_cs(cs, "No dictionary definition for default EAP method '%s'", + inst->default_method_name); + return -1; + } + + if (!inst->methods[method]) { + cf_log_err_cs(cs, "No such sub-type for default EAP method %s", + inst->default_method_name); + return -1; + } + inst->default_method = method; /* save the numerical method */ + + /* + * 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(NULL, eap_handler_cmp, NULL, 0); + if (!inst->session_tree) { + ERROR("rlm_eap (%s): Cannot initialize tree", inst->xlat_name); + return -1; + } + fr_link_talloc_ctx_free(inst, inst->session_tree); + +#ifdef HAVE_PTHREAD_H + if (pthread_mutex_init(&(inst->session_mutex), NULL) < 0) { + ERROR("rlm_eap (%s): Failed initializing mutex: %s", inst->xlat_name, fr_syserror(errno)); + return -1; + } +#endif + + if (!inst->dedup_key || !*inst->dedup_key) { + return 0; + } + + inst->dedup_tree = rbtree_create(NULL, dedup_cmp, NULL, 0); + if (!inst->dedup_tree) { + ERROR("rlm_eap (%s): Cannot initialize dedup tree", inst->xlat_name); + return -1; + } + + return 0; +} + + +/* + * For backwards compatibility. + */ +static rlm_rcode_t CC_HINT(nonnull) mod_authenticate(void *instance, REQUEST *request) +{ + rlm_eap_t *inst; + eap_handler_t *handler; + eap_packet_raw_t *eap_packet; + eap_rcode_t status; + rlm_rcode_t rcode; + + inst = (rlm_eap_t *) instance; + + if (!fr_pair_find_by_num(request->packet->vps, PW_EAP_MESSAGE, 0, TAG_ANY)) { + REDEBUG("You set 'Auth-Type = %s' for a request that does " + "not contain an EAP-Message attribute!", inst->xlat_name); + return RLM_MODULE_INVALID; + } + + /* + * Get the eap packet to start with + */ + eap_packet = eap_vp2packet(request, request->packet->vps); + if (!eap_packet) { + RERROR("Malformed EAP Message: %s", fr_strerror()); + 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) { + RDEBUG2("Failed in handler"); + return RLM_MODULE_INVALID; + } + + /* + * Select the appropriate method or default to the + * configured one + */ + status = eap_method_select(inst, handler); + + /* + * If it failed, die. + */ + if (status == EAP_INVALID) { + eap_fail(handler); + talloc_free(handler); + RDEBUG2("Failed in EAP select"); + return RLM_MODULE_INVALID; + } + +#ifdef WITH_PROXY + /* + * If we're doing horrible tunneling work, remember it. + */ + if ((request->options & RAD_REQUEST_OPTION_PROXY_EAP) != 0) { + RDEBUG2("No 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. + */ + handler->inst_holder = inst; + status = request_data_add(request, inst, REQUEST_DATA_EAP_HANDLER, handler, true); + + rad_assert(status == 0); + return RLM_MODULE_HANDLED; + } +#endif + +#ifdef WITH_PROXY + /* + * 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); + + /* + * Add the handle to the proxied list, so that we + * can retrieve it in the post-proxy stage, and + * send a response. + */ + handler->inst_holder = inst; + + status = request_data_add(request, inst, REQUEST_DATA_EAP_HANDLER, handler, true); + + rad_assert(status == 0); + + /* + * Some simple sanity checks. These should really + * be handled by the radius library... + */ + vp = fr_pair_find_by_num(request->proxy->vps, PW_EAP_MESSAGE, 0, TAG_ANY); + if (vp) { + vp = fr_pair_find_by_num(request->proxy->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY); + if (!vp) { + fr_pair_make(request->proxy, + &request->proxy->vps, + "Message-Authenticator", + NULL, T_OP_EQ); + } + } + + /* + * 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... + */ + fr_pair_delete_by_num(&request->proxy->vps, PW_FREERADIUS_PROXIED_TO, VENDORPEC_FREERADIUS, TAG_ANY); + + RWDEBUG2("Tunneled session will be proxied. Not doing EAP"); + return RLM_MODULE_HANDLED; + } +#endif + + /* + * 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. + */ + if ((handler->eap_ds->request->code == PW_EAP_REQUEST) && + (handler->eap_ds->request->type.num >= PW_EAP_MD5)) { + /* + * Return FAIL if we can't remember the handler. + * This is actually disallowed by the + * specification, as unexpected FAILs could have + * been forged. However, we want to signal to + * everyone else involved that we are + * intentionally failing the session, as opposed + * to accidentally failing it. + */ + if (!eaplist_add(inst, handler)) { + RDEBUG("Failed adding handler to the list"); + eap_fail(handler); + talloc_free(handler); + return RLM_MODULE_FAIL; + } + + } else { + /* + * Enable the cached entry on success. + */ + if (handler->eap_ds->request->code == PW_EAP_SUCCESS) { + VALUE_PAIR *vp; + + vp = fr_pair_find_by_num(request->state, PW_TLS_CACHE_FILENAME, 0, TAG_ANY); + if (vp) (void) chmod(vp->vp_strvalue, S_IRUSR | S_IWUSR); + } + + /* + * Disable the cached entry on failure. + */ + if (handler->eap_ds->request->code == PW_EAP_FAILURE) { + VALUE_PAIR *vp; + + vp = fr_pair_find_by_num(request->state, PW_TLS_CACHE_FILENAME, 0, TAG_ANY); + if (vp) (void) unlink(vp->vp_strvalue); + } + + RDEBUG2("Freeing handler"); + /* handler is not required any more, free it now */ + talloc_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_CODE_ACCESS_ACCEPT) && + request->username) { + VALUE_PAIR *vp; + + /* + * Doesn't exist, add it in. + */ + vp = fr_pair_find_by_num(request->reply->vps, PW_USER_NAME, 0, TAG_ANY); + if (!vp) { + vp = request->username; + if (vp->da->attr != PW_USER_NAME) { + vp = fr_pair_find_by_num(request->packet->vps, PW_USER_NAME, 0, TAG_ANY); + } + if (vp) { + vp = fr_pair_copy(request->reply, vp); + fr_pair_add(&request->reply->vps, vp); + } + } + + /* + * Cisco AP1230 has a bug and needs a zero + * terminated string in Access-Accept. This + * means it requires 2 trailing zeros. One to + * send in the RADIUS packet, and the other to + * convince the rest of the server that + * vp->vp_strvalue is still a NUL-terminated C + * string. + */ + if (vp && inst->mod_accounting_username_bug) { + char const *old = vp->vp_strvalue; + char *new; + + vp->vp_length++; /* account for an additional zero */ + + new = talloc_array(vp, char, vp->vp_length + 1); + + memcpy(new, old, vp->vp_length); + new[vp->length] = '\0'; + vp->vp_strvalue = new; + + rad_const_free(old); + VERIFY_VP(vp); + } + } + + return rcode; +} + +/* + * EAP authorization DEPENDS on other rlm authorizations, + * to check for user existence & get their configured values. + * It Handles EAP-START Messages, User-Name initilization. + */ +static rlm_rcode_t CC_HINT(nonnull) mod_authorize(void *instance, REQUEST *request) +{ + rlm_eap_t *inst; + int status; + VALUE_PAIR *vp; + + inst = (rlm_eap_t *)instance; + +#ifdef WITH_PROXY + /* + * 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; +#endif + + /* + * 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_OK: + 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 = fr_pair_find_by_num(request->config, PW_AUTH_TYPE, 0, TAG_ANY); + if ((!vp) || (vp->vp_integer != PW_AUTH_TYPE_REJECT)) { + vp = pair_make_config("Auth-Type", inst->xlat_name, T_OP_EQ); + if (!vp) { + RDEBUG2("Failed to create Auth-Type %s: %s\n", + inst->xlat_name, fr_strerror()); + return RLM_MODULE_FAIL; + } + } else { + RWDEBUG2("Auth-Type already set. Not setting to EAP"); + } + + if (status == EAP_OK) return RLM_MODULE_OK; + + return RLM_MODULE_UPDATED; +} + + +#ifdef WITH_PROXY +static rlm_rcode_t CC_HINT(nonnull) mod_pre_proxy(UNUSED void *instance, REQUEST *request) +{ + VALUE_PAIR *vp; + size_t length, eap_length; + + vp = fr_pair_find_by_num(request->packet->vps, PW_EAP_MESSAGE, 0, TAG_ANY); + if (!vp) return RLM_MODULE_NOOP; + + if (vp->vp_length < 4) { + RDEBUG("EAP packet is too small"); + + add_error_cause: + /* + * Invalid EAP packet (ignored) + */ + pair_make_reply("Error-Cause", "202", T_OP_EQ); + return RLM_MODULE_REJECT; + } + + /* + * The length field has to match the length of all EAP-Messages. + */ + length = (vp->vp_octets[2] << 8) | vp->vp_octets[3]; + + /* + * Get length of all EAP-Message attributes + */ + for (eap_length = 0; vp != NULL; vp = vp->next) { + eap_length += vp->vp_length; + } + + if (length != eap_length) { + RDEBUG("EAP length does not match attribute length"); + goto add_error_cause; + } + + return RLM_MODULE_NOOP; +} + +/* + * If we're proxying EAP, then there may be magic we need + * to do. + */ +static rlm_rcode_t CC_HINT(nonnull) mod_post_proxy(void *inst, REQUEST *request) +{ + size_t i; + size_t len; + ssize_t ret; + char *p; + VALUE_PAIR *vp; + eap_handler_t *handler; + vp_cursor_t cursor; + + /* + * 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) { + rlm_rcode_t 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) { + RERROR("Failed to retrieve callback for tunneled session!"); + talloc_free(handler); + return RLM_MODULE_FAIL; + } + + /* + * Do the callback... + */ + RDEBUG2("Doing post-proxy callback"); + rcode = data->callback(handler, data->tls_session); + talloc_free(data); + if (rcode == 0) { + RDEBUG2("Failed in post-proxy callback"); + eap_fail(handler); + talloc_free(handler); + return RLM_MODULE_REJECT; + } + + /* + * We are done, wrap the EAP-request in RADIUS to send + * with all other required radius attributes + */ + eap_compose(handler); + + /* + * Add to the list only if it is EAP-Request. + */ + if ((handler->eap_ds->request->code == PW_EAP_REQUEST) && + (handler->eap_ds->request->type.num >= PW_EAP_MD5)) { + if (!eaplist_add(inst, handler)) { + eap_fail(handler); + talloc_free(handler); + return RLM_MODULE_FAIL; + } + + } else { + RDEBUG2("Freeing handler"); + /* handler is not required any more, free it now */ + talloc_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_CODE_ACCESS_ACCEPT) && + request->username) { + /* + * Doesn't exist, add it in. + */ + vp = fr_pair_find_by_num(request->reply->vps, PW_USER_NAME, 0, TAG_ANY); + if (!vp) { + pair_make_reply("User-Name", + request->username->vp_strvalue, + T_OP_EQ); + } + } + + return RLM_MODULE_OK; + } else { + RDEBUG2("No pre-existing handler found"); + } + + /* + * This is allowed. + */ + if (!request->proxy_reply) return RLM_MODULE_NOOP; + + /* + * There may be more than one Cisco-AVPair. + * Ensure we find the one with the LEAP attribute. + */ + fr_cursor_init(&cursor, &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 = fr_cursor_next_by_num(&cursor, 1, 9, TAG_ANY); + if (!vp) { + return RLM_MODULE_NOOP; + } + + /* + * If it's "leap:session-key", then stop. + * + * The format is VERY specific! + */ + if (strncasecmp(vp->vp_strvalue, "leap:session-key=", 17) == 0) { + break; + } + } + + /* + * The format is very specific. + */ + if (vp->vp_length != (17 + 34)) { + RDEBUG2("Cisco-AVPair with leap:session-key has incorrect length %zu: Expected %d", + vp->vp_length, 17 + 34); + return RLM_MODULE_NOOP; + } + + /* + * Decrypt the session key, using the proxy data. + * + * Note that the session key is *binary*, and therefore + * may contain embedded zeros. So we have to use memdup. + * However, Cisco-AVPair is a "string", so the rest of the + * code assumes that it's terminated by a trailing '\0'. + * + * So... be sure to (a) use memdup, and (b) include the last + * zero byte. + */ + i = 34; + p = talloc_memdup(vp, vp->vp_strvalue, vp->vp_length + 1); + talloc_set_type(p, uint8_t); + ret = rad_tunnel_pwdecode((uint8_t *)p + 17, &i, request->home_server->secret, request->proxy->vector); + if (ret < 0) { + REDEBUG("Decoding leap:session-key failed"); + talloc_free(p); + return RLM_MODULE_FAIL; + } + len = i; + + if (i != 16) { + REDEBUG("Decoded key length is incorrect, must be 16 bytes"); + talloc_free(p); + return RLM_MODULE_FAIL; + } + + /* + * Encrypt the session key again, using the request data. + */ + ret = rad_tunnel_pwencode(p + 17, &len, request->client->secret, request->packet->vector); + if (ret < 0) { + REDEBUG("Decoding leap:session-key failed"); + talloc_free(p); + return RLM_MODULE_FAIL; + } + + fr_pair_value_strsteal(vp, p); + + return RLM_MODULE_UPDATED; +} +#endif + +static rlm_rcode_t CC_HINT(nonnull) mod_post_auth(void *instance, REQUEST *request) +{ + rlm_eap_t *inst = instance; + VALUE_PAIR *vp; + eap_handler_t *handler; + eap_packet_raw_t *eap_packet; + + /* + * Only build a failure message if something previously rejected the request + */ + vp = fr_pair_find_by_num(request->config, PW_POST_AUTH_TYPE, 0, TAG_ANY); + + if (!vp || (vp->vp_integer != PW_POST_AUTH_TYPE_REJECT)) return RLM_MODULE_NOOP; + + if (!fr_pair_find_by_num(request->packet->vps, PW_EAP_MESSAGE, 0, TAG_ANY)) { + RDEBUG3("Request didn't contain an EAP-Message, not inserting EAP-Failure"); + return RLM_MODULE_NOOP; + } + + if (fr_pair_find_by_num(request->reply->vps, PW_EAP_MESSAGE, 0, TAG_ANY)) { + RDEBUG3("Reply already contained an EAP-Message, not inserting EAP-Failure"); + return RLM_MODULE_NOOP; + } + + eap_packet = eap_vp2packet(request, request->packet->vps); + if (!eap_packet) { + RERROR("Malformed EAP Message: %s", fr_strerror()); + return RLM_MODULE_FAIL; + } + + handler = eap_handler(inst, &eap_packet, request); + if (!handler) { + RDEBUG2("Failed to get handler, probably already removed, not inserting EAP-Failure"); + return RLM_MODULE_NOOP; + } + + RDEBUG2("Request was previously rejected, inserting EAP-Failure"); + eap_fail(handler); + talloc_free(handler); + + /* + * Make sure there's a message authenticator attribute in the response + * RADIUS protocol code will calculate the correct value later... + */ + vp = fr_pair_find_by_num(request->reply->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY); + if (!vp) { + pair_make_reply("Message-Authenticator", "0x00", T_OP_EQ); + } + + return RLM_MODULE_UPDATED; +} + +/* + * The module name should be the only globally exported symbol. + * That is, everything else should be 'static'. + */ +extern module_t rlm_eap; +module_t rlm_eap = { + .magic = RLM_MODULE_INIT, + .name = "eap", + .inst_size = sizeof(rlm_eap_t), + .config = module_config, + .instantiate = mod_instantiate, + .detach = mod_detach, + .methods = { + [MOD_AUTHENTICATE] = mod_authenticate, + [MOD_AUTHORIZE] = mod_authorize, +#ifdef WITH_PROXY + [MOD_PRE_PROXY] = mod_pre_proxy, + [MOD_POST_PROXY] = mod_post_proxy, +#endif + [MOD_POST_AUTH] = mod_post_auth + }, +}; |