/* * hostapd / EAP-SIM (RFC 4186) * Copyright (c) 2005-2012, Jouni Malinen <j@w1.fi> * * This software may be distributed under the terms of the BSD license. * See README for more details. */ #include "includes.h" #include "common.h" #include "crypto/random.h" #include "eap_server/eap_i.h" #include "eap_common/eap_sim_common.h" #include "eap_server/eap_sim_db.h" struct eap_sim_data { u8 mk[EAP_SIM_MK_LEN]; u8 nonce_mt[EAP_SIM_NONCE_MT_LEN]; u8 nonce_s[EAP_SIM_NONCE_S_LEN]; u8 k_aut[EAP_SIM_K_AUT_LEN]; u8 k_encr[EAP_SIM_K_ENCR_LEN]; u8 msk[EAP_SIM_KEYING_DATA_LEN]; u8 emsk[EAP_EMSK_LEN]; u8 kc[EAP_SIM_MAX_CHAL][EAP_SIM_KC_LEN]; u8 sres[EAP_SIM_MAX_CHAL][EAP_SIM_SRES_LEN]; u8 rand[EAP_SIM_MAX_CHAL][GSM_RAND_LEN]; u8 reauth_mac[EAP_SIM_MAC_LEN]; int num_chal; enum { START, CHALLENGE, REAUTH, NOTIFICATION, SUCCESS, FAILURE } state; char *next_pseudonym; char *next_reauth_id; u16 counter; struct eap_sim_reauth *reauth; u16 notification; int use_result_ind; int start_round; char permanent[20]; /* Permanent username */ }; static const char * eap_sim_state_txt(int state) { switch (state) { case START: return "START"; case CHALLENGE: return "CHALLENGE"; case REAUTH: return "REAUTH"; case SUCCESS: return "SUCCESS"; case FAILURE: return "FAILURE"; case NOTIFICATION: return "NOTIFICATION"; default: return "Unknown?!"; } } static void eap_sim_state(struct eap_sim_data *data, int state) { wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s", eap_sim_state_txt(data->state), eap_sim_state_txt(state)); data->state = state; } static void * eap_sim_init(struct eap_sm *sm) { struct eap_sim_data *data; if (!sm->cfg->eap_sim_db_priv) { wpa_printf(MSG_WARNING, "EAP-SIM: eap_sim_db not configured"); return NULL; } data = os_zalloc(sizeof(*data)); if (data == NULL) return NULL; data->state = START; return data; } static void eap_sim_reset(struct eap_sm *sm, void *priv) { struct eap_sim_data *data = priv; os_free(data->next_pseudonym); os_free(data->next_reauth_id); bin_clear_free(data, sizeof(*data)); } static struct wpabuf * eap_sim_build_start(struct eap_sm *sm, struct eap_sim_data *data, u8 id) { struct eap_sim_msg *msg; u8 ver[2]; wpa_printf(MSG_DEBUG, "EAP-SIM: Generating Start"); msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START); data->start_round++; if (data->start_round == 1) { /* * RFC 4186, Chap. 4.2.4 recommends that identity from EAP is * ignored and the SIM/Start is used to request the identity. */ wpa_printf(MSG_DEBUG, " AT_ANY_ID_REQ"); eap_sim_msg_add(msg, EAP_SIM_AT_ANY_ID_REQ, 0, NULL, 0); } else if (data->start_round > 3) { /* Cannot use more than three rounds of Start messages */ eap_sim_msg_free(msg); return NULL; } else if (data->start_round == 0) { /* * This is a special case that is used to recover from * AT_COUNTER_TOO_SMALL during re-authentication. Since we * already know the identity of the peer, there is no need to * request any identity in this case. */ } else if (sm->identity && sm->identity_len > 0 && sm->identity[0] == EAP_SIM_REAUTH_ID_PREFIX) { /* Reauth id may have expired - try fullauth */ wpa_printf(MSG_DEBUG, " AT_FULLAUTH_ID_REQ"); eap_sim_msg_add(msg, EAP_SIM_AT_FULLAUTH_ID_REQ, 0, NULL, 0); } else { wpa_printf(MSG_DEBUG, " AT_PERMANENT_ID_REQ"); eap_sim_msg_add(msg, EAP_SIM_AT_PERMANENT_ID_REQ, 0, NULL, 0); } wpa_printf(MSG_DEBUG, " AT_VERSION_LIST"); ver[0] = 0; ver[1] = EAP_SIM_VERSION; eap_sim_msg_add(msg, EAP_SIM_AT_VERSION_LIST, sizeof(ver), ver, sizeof(ver)); return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0); } static int eap_sim_build_encr(struct eap_sm *sm, struct eap_sim_data *data, struct eap_sim_msg *msg, u16 counter, const u8 *nonce_s) { os_free(data->next_pseudonym); if (!(sm->cfg->eap_sim_id & 0x01)) { /* Use of pseudonyms disabled in configuration */ data->next_pseudonym = NULL; } else if (!nonce_s) { data->next_pseudonym = eap_sim_db_get_next_pseudonym(sm->cfg->eap_sim_db_priv, EAP_SIM_DB_SIM); } else { /* Do not update pseudonym during re-authentication */ data->next_pseudonym = NULL; } os_free(data->next_reauth_id); if (!(sm->cfg->eap_sim_id & 0x02)) { /* Use of fast reauth disabled in configuration */ data->next_reauth_id = NULL; } else if (data->counter <= EAP_SIM_MAX_FAST_REAUTHS) { data->next_reauth_id = eap_sim_db_get_next_reauth_id(sm->cfg->eap_sim_db_priv, EAP_SIM_DB_SIM); } else { wpa_printf(MSG_DEBUG, "EAP-SIM: Max fast re-authentication " "count exceeded - force full authentication"); data->next_reauth_id = NULL; } if (data->next_pseudonym == NULL && data->next_reauth_id == NULL && counter == 0 && nonce_s == NULL) return 0; wpa_printf(MSG_DEBUG, " AT_IV"); wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); if (counter > 0) { wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", counter); eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0); } if (nonce_s) { wpa_printf(MSG_DEBUG, " *AT_NONCE_S"); eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_S, 0, nonce_s, EAP_SIM_NONCE_S_LEN); } if (data->next_pseudonym) { wpa_printf(MSG_DEBUG, " *AT_NEXT_PSEUDONYM (%s)", data->next_pseudonym); eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_PSEUDONYM, os_strlen(data->next_pseudonym), (u8 *) data->next_pseudonym, os_strlen(data->next_pseudonym)); } if (data->next_reauth_id) { wpa_printf(MSG_DEBUG, " *AT_NEXT_REAUTH_ID (%s)", data->next_reauth_id); eap_sim_msg_add(msg, EAP_SIM_AT_NEXT_REAUTH_ID, os_strlen(data->next_reauth_id), (u8 *) data->next_reauth_id, os_strlen(data->next_reauth_id)); } if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt " "AT_ENCR_DATA"); return -1; } return 0; } static struct wpabuf * eap_sim_build_challenge(struct eap_sm *sm, struct eap_sim_data *data, u8 id) { struct eap_sim_msg *msg; wpa_printf(MSG_DEBUG, "EAP-SIM: Generating Challenge"); msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_SIM, EAP_SIM_SUBTYPE_CHALLENGE); wpa_printf(MSG_DEBUG, " AT_RAND"); eap_sim_msg_add(msg, EAP_SIM_AT_RAND, 0, (u8 *) data->rand, data->num_chal * GSM_RAND_LEN); if (eap_sim_build_encr(sm, data, msg, 0, NULL)) { eap_sim_msg_free(msg); return NULL; } if (sm->cfg->eap_sim_aka_result_ind) { wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); } wpa_printf(MSG_DEBUG, " AT_MAC"); eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, data->nonce_mt, EAP_SIM_NONCE_MT_LEN); } static struct wpabuf * eap_sim_build_reauth(struct eap_sm *sm, struct eap_sim_data *data, u8 id) { struct eap_sim_msg *msg; struct wpabuf *buf; wpa_printf(MSG_DEBUG, "EAP-SIM: Generating Re-authentication"); if (random_get_bytes(data->nonce_s, EAP_SIM_NONCE_S_LEN)) return NULL; wpa_hexdump_key(MSG_MSGDUMP, "EAP-SIM: NONCE_S", data->nonce_s, EAP_SIM_NONCE_S_LEN); eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk, data->emsk); eap_sim_derive_keys_reauth(data->counter, sm->identity, sm->identity_len, data->nonce_s, data->mk, data->msk, data->emsk); msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_SIM, EAP_SIM_SUBTYPE_REAUTHENTICATION); if (eap_sim_build_encr(sm, data, msg, data->counter, data->nonce_s)) { eap_sim_msg_free(msg); return NULL; } if (sm->cfg->eap_sim_aka_result_ind) { wpa_printf(MSG_DEBUG, " AT_RESULT_IND"); eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0); } wpa_printf(MSG_DEBUG, " AT_MAC"); eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); buf = eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, NULL, 0); /* Remember this MAC before sending it to the peer. This MAC is used for * Session-Id calculation after receiving response from the peer and * after all other checks pass. */ os_memcpy(data->reauth_mac, wpabuf_head_u8(buf) + wpabuf_len(buf) - EAP_SIM_MAC_LEN, EAP_SIM_MAC_LEN); return buf; } static struct wpabuf * eap_sim_build_notification(struct eap_sm *sm, struct eap_sim_data *data, u8 id) { struct eap_sim_msg *msg; wpa_printf(MSG_DEBUG, "EAP-SIM: Generating Notification"); msg = eap_sim_msg_init(EAP_CODE_REQUEST, id, EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION); wpa_printf(MSG_DEBUG, " AT_NOTIFICATION (%d)", data->notification); eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, data->notification, NULL, 0); if (data->use_result_ind) { if (data->reauth) { wpa_printf(MSG_DEBUG, " AT_IV"); wpa_printf(MSG_DEBUG, " AT_ENCR_DATA"); eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA); wpa_printf(MSG_DEBUG, " *AT_COUNTER (%u)", data->counter); eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter, NULL, 0); if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) { wpa_printf(MSG_WARNING, "EAP-SIM: Failed to " "encrypt AT_ENCR_DATA"); eap_sim_msg_free(msg); return NULL; } } wpa_printf(MSG_DEBUG, " AT_MAC"); eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC); } return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, NULL, 0); } static struct wpabuf * eap_sim_buildReq(struct eap_sm *sm, void *priv, u8 id) { struct eap_sim_data *data = priv; switch (data->state) { case START: return eap_sim_build_start(sm, data, id); case CHALLENGE: return eap_sim_build_challenge(sm, data, id); case REAUTH: return eap_sim_build_reauth(sm, data, id); case NOTIFICATION: return eap_sim_build_notification(sm, data, id); default: wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown state %d in " "buildReq", data->state); break; } return NULL; } static bool eap_sim_check(struct eap_sm *sm, void *priv, struct wpabuf *respData) { const u8 *pos; size_t len; pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, respData, &len); if (pos == NULL || len < 3) { wpa_printf(MSG_INFO, "EAP-SIM: Invalid frame"); return true; } return false; } static bool eap_sim_unexpected_subtype(struct eap_sim_data *data, u8 subtype) { if (subtype == EAP_SIM_SUBTYPE_CLIENT_ERROR) return false; switch (data->state) { case START: if (subtype != EAP_SIM_SUBTYPE_START) { wpa_printf(MSG_INFO, "EAP-SIM: Unexpected response " "subtype %d", subtype); return true; } break; case CHALLENGE: if (subtype != EAP_SIM_SUBTYPE_CHALLENGE) { wpa_printf(MSG_INFO, "EAP-SIM: Unexpected response " "subtype %d", subtype); return true; } break; case REAUTH: if (subtype != EAP_SIM_SUBTYPE_REAUTHENTICATION) { wpa_printf(MSG_INFO, "EAP-SIM: Unexpected response " "subtype %d", subtype); return true; } break; case NOTIFICATION: if (subtype != EAP_SIM_SUBTYPE_NOTIFICATION) { wpa_printf(MSG_INFO, "EAP-SIM: Unexpected response " "subtype %d", subtype); return true; } break; default: wpa_printf(MSG_INFO, "EAP-SIM: Unexpected state (%d) for " "processing a response", data->state); return true; } return false; } static int eap_sim_supported_ver(struct eap_sim_data *data, int version) { return version == EAP_SIM_VERSION; } static void eap_sim_process_start(struct eap_sm *sm, struct eap_sim_data *data, struct wpabuf *respData, struct eap_sim_attrs *attr) { size_t identity_len; u8 ver_list[2]; u8 *new_identity; char *username; wpa_printf(MSG_DEBUG, "EAP-SIM: Receive start response"); if (data->start_round == 0) { /* * Special case for AT_COUNTER_TOO_SMALL recovery - no identity * was requested since we already know it. */ goto skip_id_update; } /* * We always request identity in SIM/Start, so the peer is required to * have replied with one. */ if (!attr->identity || attr->identity_len == 0) { wpa_printf(MSG_DEBUG, "EAP-SIM: Peer did not provide any " "identity"); goto failed; } new_identity = os_malloc(attr->identity_len); if (new_identity == NULL) goto failed; os_free(sm->identity); sm->identity = new_identity; os_memcpy(sm->identity, attr->identity, attr->identity_len); sm->identity_len = attr->identity_len; wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Identity", sm->identity, sm->identity_len); username = sim_get_username(sm->identity, sm->identity_len); if (username == NULL) goto failed; if (username[0] == EAP_SIM_REAUTH_ID_PREFIX) { wpa_printf(MSG_DEBUG, "EAP-SIM: Reauth username '%s'", username); data->reauth = eap_sim_db_get_reauth_entry( sm->cfg->eap_sim_db_priv, username); os_free(username); if (data->reauth == NULL) { wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown reauth " "identity - request full auth identity"); /* Remain in START state for another round */ return; } wpa_printf(MSG_DEBUG, "EAP-SIM: Using fast re-authentication"); os_strlcpy(data->permanent, data->reauth->permanent, sizeof(data->permanent)); data->counter = data->reauth->counter; os_memcpy(data->mk, data->reauth->mk, EAP_SIM_MK_LEN); eap_sim_state(data, REAUTH); return; } if (username[0] == EAP_SIM_PSEUDONYM_PREFIX) { const char *permanent; wpa_printf(MSG_DEBUG, "EAP-SIM: Pseudonym username '%s'", username); permanent = eap_sim_db_get_permanent( sm->cfg->eap_sim_db_priv, username); os_free(username); if (permanent == NULL) { wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown pseudonym " "identity - request permanent identity"); /* Remain in START state for another round */ return; } os_strlcpy(data->permanent, permanent, sizeof(data->permanent)); } else if (username[0] == EAP_SIM_PERMANENT_PREFIX) { wpa_printf(MSG_DEBUG, "EAP-SIM: Permanent username '%s'", username); os_strlcpy(data->permanent, username, sizeof(data->permanent)); os_free(username); } else { wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized username '%s'", username); os_free(username); goto failed; } skip_id_update: /* Full authentication */ if (attr->nonce_mt == NULL || attr->selected_version < 0) { wpa_printf(MSG_DEBUG, "EAP-SIM: Start/Response missing " "required attributes"); goto failed; } if (!eap_sim_supported_ver(data, attr->selected_version)) { wpa_printf(MSG_DEBUG, "EAP-SIM: Peer selected unsupported " "version %d", attr->selected_version); goto failed; } data->counter = 0; /* reset re-auth counter since this is full auth */ data->reauth = NULL; data->num_chal = eap_sim_db_get_gsm_triplets( sm->cfg->eap_sim_db_priv, data->permanent, EAP_SIM_MAX_CHAL, (u8 *) data->rand, (u8 *) data->kc, (u8 *) data->sres, sm); if (data->num_chal == EAP_SIM_DB_PENDING) { wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication triplets " "not yet available - pending request"); sm->method_pending = METHOD_PENDING_WAIT; return; } if (data->num_chal < 2) { wpa_printf(MSG_INFO, "EAP-SIM: Failed to get GSM " "authentication triplets for the peer"); goto failed; } if (data->permanent[0] == EAP_SIM_PERMANENT_PREFIX) os_strlcpy(sm->imsi, &data->permanent[1], sizeof(sm->imsi)); identity_len = sm->identity_len; while (identity_len > 0 && sm->identity[identity_len - 1] == '\0') { wpa_printf(MSG_DEBUG, "EAP-SIM: Workaround - drop last null " "character from identity"); identity_len--; } wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Identity for MK derivation", sm->identity, identity_len); os_memcpy(data->nonce_mt, attr->nonce_mt, EAP_SIM_NONCE_MT_LEN); WPA_PUT_BE16(ver_list, EAP_SIM_VERSION); eap_sim_derive_mk(sm->identity, identity_len, attr->nonce_mt, attr->selected_version, ver_list, sizeof(ver_list), data->num_chal, (const u8 *) data->kc, data->mk); eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk, data->emsk); eap_sim_state(data, CHALLENGE); return; failed: data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; eap_sim_state(data, NOTIFICATION); } static void eap_sim_process_challenge(struct eap_sm *sm, struct eap_sim_data *data, struct wpabuf *respData, struct eap_sim_attrs *attr) { if (attr->mac == NULL || eap_sim_verify_mac(data->k_aut, respData, attr->mac, (u8 *) data->sres, data->num_chal * EAP_SIM_SRES_LEN)) { wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message " "did not include valid AT_MAC"); data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; eap_sim_state(data, NOTIFICATION); return; } wpa_printf(MSG_DEBUG, "EAP-SIM: Challenge response includes the " "correct AT_MAC"); if (sm->cfg->eap_sim_aka_result_ind && attr->result_ind) { data->use_result_ind = 1; data->notification = EAP_SIM_SUCCESS; eap_sim_state(data, NOTIFICATION); } else eap_sim_state(data, SUCCESS); if (data->next_pseudonym) { eap_sim_db_add_pseudonym(sm->cfg->eap_sim_db_priv, data->permanent, data->next_pseudonym); data->next_pseudonym = NULL; } if (data->next_reauth_id) { eap_sim_db_add_reauth(sm->cfg->eap_sim_db_priv, data->permanent, data->next_reauth_id, data->counter + 1, data->mk); data->next_reauth_id = NULL; } } static void eap_sim_process_reauth(struct eap_sm *sm, struct eap_sim_data *data, struct wpabuf *respData, struct eap_sim_attrs *attr) { struct eap_sim_attrs eattr; u8 *decrypted = NULL; if (attr->mac == NULL || eap_sim_verify_mac(data->k_aut, respData, attr->mac, data->nonce_s, EAP_SIM_NONCE_S_LEN)) { wpa_printf(MSG_WARNING, "EAP-SIM: Re-authentication message " "did not include valid AT_MAC"); goto fail; } if (attr->encr_data == NULL || attr->iv == NULL) { wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication " "message did not include encrypted data"); goto fail; } decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data, attr->encr_data_len, attr->iv, &eattr, 0); if (decrypted == NULL) { wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted " "data from reauthentication message"); goto fail; } if (eattr.counter != data->counter) { wpa_printf(MSG_WARNING, "EAP-SIM: Re-authentication message " "used incorrect counter %u, expected %u", eattr.counter, data->counter); goto fail; } os_free(decrypted); decrypted = NULL; wpa_printf(MSG_DEBUG, "EAP-SIM: Re-authentication response includes " "the correct AT_MAC"); if (eattr.counter_too_small) { wpa_printf(MSG_DEBUG, "EAP-AKA: Re-authentication response " "included AT_COUNTER_TOO_SMALL - starting full " "authentication"); data->start_round = -1; eap_sim_state(data, START); return; } if (sm->cfg->eap_sim_aka_result_ind && attr->result_ind) { data->use_result_ind = 1; data->notification = EAP_SIM_SUCCESS; eap_sim_state(data, NOTIFICATION); } else eap_sim_state(data, SUCCESS); if (data->next_reauth_id) { eap_sim_db_add_reauth(sm->cfg->eap_sim_db_priv, data->permanent, data->next_reauth_id, data->counter + 1, data->mk); data->next_reauth_id = NULL; } else { eap_sim_db_remove_reauth(sm->cfg->eap_sim_db_priv, data->reauth); data->reauth = NULL; } return; fail: data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; eap_sim_state(data, NOTIFICATION); eap_sim_db_remove_reauth(sm->cfg->eap_sim_db_priv, data->reauth); data->reauth = NULL; os_free(decrypted); } static void eap_sim_process_client_error(struct eap_sm *sm, struct eap_sim_data *data, struct wpabuf *respData, struct eap_sim_attrs *attr) { wpa_printf(MSG_DEBUG, "EAP-SIM: Client reported error %d", attr->client_error_code); if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind) eap_sim_state(data, SUCCESS); else eap_sim_state(data, FAILURE); } static void eap_sim_process_notification(struct eap_sm *sm, struct eap_sim_data *data, struct wpabuf *respData, struct eap_sim_attrs *attr) { wpa_printf(MSG_DEBUG, "EAP-SIM: Client replied to notification"); if (data->notification == EAP_SIM_SUCCESS && data->use_result_ind) eap_sim_state(data, SUCCESS); else eap_sim_state(data, FAILURE); } static void eap_sim_process(struct eap_sm *sm, void *priv, struct wpabuf *respData) { struct eap_sim_data *data = priv; const u8 *pos, *end; u8 subtype; size_t len; struct eap_sim_attrs attr; pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, respData, &len); if (pos == NULL || len < 3) return; end = pos + len; subtype = *pos; pos += 3; if (eap_sim_unexpected_subtype(data, subtype)) { wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized or unexpected " "EAP-SIM Subtype in EAP Response"); data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; eap_sim_state(data, NOTIFICATION); return; } if (eap_sim_parse_attr(pos, end, &attr, 0, 0)) { wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to parse attributes"); if (subtype != EAP_SIM_SUBTYPE_CLIENT_ERROR && (data->state == START || data->state == CHALLENGE || data->state == REAUTH)) { data->notification = EAP_SIM_GENERAL_FAILURE_BEFORE_AUTH; eap_sim_state(data, NOTIFICATION); return; } eap_sim_state(data, FAILURE); return; } if (subtype == EAP_SIM_SUBTYPE_CLIENT_ERROR) { eap_sim_process_client_error(sm, data, respData, &attr); return; } switch (data->state) { case START: eap_sim_process_start(sm, data, respData, &attr); break; case CHALLENGE: eap_sim_process_challenge(sm, data, respData, &attr); break; case REAUTH: eap_sim_process_reauth(sm, data, respData, &attr); break; case NOTIFICATION: eap_sim_process_notification(sm, data, respData, &attr); break; default: wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown state %d in " "process", data->state); break; } } static bool eap_sim_isDone(struct eap_sm *sm, void *priv) { struct eap_sim_data *data = priv; return data->state == SUCCESS || data->state == FAILURE; } static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len) { struct eap_sim_data *data = priv; u8 *key; if (data->state != SUCCESS) return NULL; key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN); if (key == NULL) return NULL; *len = EAP_SIM_KEYING_DATA_LEN; return key; } static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len) { struct eap_sim_data *data = priv; u8 *key; if (data->state != SUCCESS) return NULL; key = os_memdup(data->emsk, EAP_EMSK_LEN); if (key == NULL) return NULL; *len = EAP_EMSK_LEN; return key; } static bool eap_sim_isSuccess(struct eap_sm *sm, void *priv) { struct eap_sim_data *data = priv; return data->state == SUCCESS; } static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len) { struct eap_sim_data *data = priv; u8 *id; if (data->state != SUCCESS) return NULL; if (!data->reauth) *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN; else *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN; id = os_malloc(*len); if (id == NULL) return NULL; id[0] = EAP_TYPE_SIM; if (!data->reauth) { os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN); os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN, data->nonce_mt, EAP_SIM_NONCE_MT_LEN); } else { os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN); os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac, EAP_SIM_MAC_LEN); } wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len); return id; } int eap_server_sim_register(void) { struct eap_method *eap; eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION, EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM"); if (eap == NULL) return -1; eap->init = eap_sim_init; eap->reset = eap_sim_reset; eap->buildReq = eap_sim_buildReq; eap->check = eap_sim_check; eap->process = eap_sim_process; eap->isDone = eap_sim_isDone; eap->getKey = eap_sim_getKey; eap->isSuccess = eap_sim_isSuccess; eap->get_emsk = eap_sim_get_emsk; eap->getSessionId = eap_sim_get_session_id; return eap_server_method_register(eap); }