| /* |
| * EAP peer method: EAP-TTLS (RFC 5281) |
| * Copyright (c) 2004-2011, 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/ms_funcs.h" |
| #include "crypto/sha1.h" |
| #include "crypto/tls.h" |
| #include "eap_common/chap.h" |
| #include "eap_common/eap_ttls.h" |
| #include "mschapv2.h" |
| #include "eap_i.h" |
| #include "eap_tls_common.h" |
| #include "eap_config.h" |
| |
| |
| #define EAP_TTLS_VERSION 0 |
| |
| |
| static void eap_ttls_deinit(struct eap_sm *sm, void *priv); |
| |
| |
| struct eap_ttls_data { |
| struct eap_ssl_data ssl; |
| |
| int ttls_version; |
| |
| const struct eap_method *phase2_method; |
| void *phase2_priv; |
| int phase2_success; |
| int phase2_start; |
| |
| enum phase2_types { |
| EAP_TTLS_PHASE2_EAP, |
| EAP_TTLS_PHASE2_MSCHAPV2, |
| EAP_TTLS_PHASE2_MSCHAP, |
| EAP_TTLS_PHASE2_PAP, |
| EAP_TTLS_PHASE2_CHAP |
| } phase2_type; |
| struct eap_method_type phase2_eap_type; |
| struct eap_method_type *phase2_eap_types; |
| size_t num_phase2_eap_types; |
| |
| u8 auth_response[MSCHAPV2_AUTH_RESPONSE_LEN]; |
| int auth_response_valid; |
| u8 master_key[MSCHAPV2_MASTER_KEY_LEN]; /* MSCHAPv2 master key */ |
| u8 ident; |
| int resuming; /* starting a resumed session */ |
| int reauth; /* reauthentication */ |
| u8 *key_data; |
| u8 *session_id; |
| size_t id_len; |
| |
| struct wpabuf *pending_phase2_req; |
| |
| #ifdef EAP_TNC |
| int ready_for_tnc; |
| int tnc_started; |
| #endif /* EAP_TNC */ |
| }; |
| |
| |
| static void * eap_ttls_init(struct eap_sm *sm) |
| { |
| struct eap_ttls_data *data; |
| struct eap_peer_config *config = eap_get_config(sm); |
| char *selected; |
| |
| data = os_zalloc(sizeof(*data)); |
| if (data == NULL) |
| return NULL; |
| data->ttls_version = EAP_TTLS_VERSION; |
| selected = "EAP"; |
| data->phase2_type = EAP_TTLS_PHASE2_EAP; |
| |
| if (config && config->phase2) { |
| if (os_strstr(config->phase2, "autheap=")) { |
| selected = "EAP"; |
| data->phase2_type = EAP_TTLS_PHASE2_EAP; |
| } else if (os_strstr(config->phase2, "auth=MSCHAPV2")) { |
| selected = "MSCHAPV2"; |
| data->phase2_type = EAP_TTLS_PHASE2_MSCHAPV2; |
| } else if (os_strstr(config->phase2, "auth=MSCHAP")) { |
| selected = "MSCHAP"; |
| data->phase2_type = EAP_TTLS_PHASE2_MSCHAP; |
| } else if (os_strstr(config->phase2, "auth=PAP")) { |
| selected = "PAP"; |
| data->phase2_type = EAP_TTLS_PHASE2_PAP; |
| } else if (os_strstr(config->phase2, "auth=CHAP")) { |
| selected = "CHAP"; |
| data->phase2_type = EAP_TTLS_PHASE2_CHAP; |
| } |
| } |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase2 type: %s", selected); |
| |
| if (data->phase2_type == EAP_TTLS_PHASE2_EAP) { |
| if (eap_peer_select_phase2_methods(config, "autheap=", |
| &data->phase2_eap_types, |
| &data->num_phase2_eap_types) |
| < 0) { |
| eap_ttls_deinit(sm, data); |
| return NULL; |
| } |
| |
| data->phase2_eap_type.vendor = EAP_VENDOR_IETF; |
| data->phase2_eap_type.method = EAP_TYPE_NONE; |
| } |
| |
| if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TTLS)) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Failed to initialize SSL."); |
| eap_ttls_deinit(sm, data); |
| return NULL; |
| } |
| |
| return data; |
| } |
| |
| |
| static void eap_ttls_phase2_eap_deinit(struct eap_sm *sm, |
| struct eap_ttls_data *data) |
| { |
| if (data->phase2_priv && data->phase2_method) { |
| data->phase2_method->deinit(sm, data->phase2_priv); |
| data->phase2_method = NULL; |
| data->phase2_priv = NULL; |
| } |
| } |
| |
| |
| static void eap_ttls_free_key(struct eap_ttls_data *data) |
| { |
| if (data->key_data) { |
| bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN); |
| data->key_data = NULL; |
| } |
| } |
| |
| |
| static void eap_ttls_deinit(struct eap_sm *sm, void *priv) |
| { |
| struct eap_ttls_data *data = priv; |
| if (data == NULL) |
| return; |
| eap_ttls_phase2_eap_deinit(sm, data); |
| os_free(data->phase2_eap_types); |
| eap_peer_tls_ssl_deinit(sm, &data->ssl); |
| eap_ttls_free_key(data); |
| os_free(data->session_id); |
| wpabuf_free(data->pending_phase2_req); |
| os_free(data); |
| } |
| |
| |
| static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id, |
| int mandatory, size_t len) |
| { |
| struct ttls_avp_vendor *avp; |
| u8 flags; |
| size_t hdrlen; |
| |
| avp = (struct ttls_avp_vendor *) avphdr; |
| flags = mandatory ? AVP_FLAGS_MANDATORY : 0; |
| if (vendor_id) { |
| flags |= AVP_FLAGS_VENDOR; |
| hdrlen = sizeof(*avp); |
| avp->vendor_id = host_to_be32(vendor_id); |
| } else { |
| hdrlen = sizeof(struct ttls_avp); |
| } |
| |
| avp->avp_code = host_to_be32(avp_code); |
| avp->avp_length = host_to_be32((flags << 24) | (u32) (hdrlen + len)); |
| |
| return avphdr + hdrlen; |
| } |
| |
| |
| static u8 * eap_ttls_avp_add(u8 *start, u8 *avphdr, u32 avp_code, |
| u32 vendor_id, int mandatory, |
| const u8 *data, size_t len) |
| { |
| u8 *pos; |
| pos = eap_ttls_avp_hdr(avphdr, avp_code, vendor_id, mandatory, len); |
| os_memcpy(pos, data, len); |
| pos += len; |
| AVP_PAD(start, pos); |
| return pos; |
| } |
| |
| |
| static int eap_ttls_avp_encapsulate(struct wpabuf **resp, u32 avp_code, |
| int mandatory) |
| { |
| struct wpabuf *msg; |
| u8 *avp, *pos; |
| |
| msg = wpabuf_alloc(sizeof(struct ttls_avp) + wpabuf_len(*resp) + 4); |
| if (msg == NULL) { |
| wpabuf_free(*resp); |
| *resp = NULL; |
| return -1; |
| } |
| |
| avp = wpabuf_mhead(msg); |
| pos = eap_ttls_avp_hdr(avp, avp_code, 0, mandatory, wpabuf_len(*resp)); |
| os_memcpy(pos, wpabuf_head(*resp), wpabuf_len(*resp)); |
| pos += wpabuf_len(*resp); |
| AVP_PAD(avp, pos); |
| wpabuf_free(*resp); |
| wpabuf_put(msg, pos - avp); |
| *resp = msg; |
| return 0; |
| } |
| |
| |
| static int eap_ttls_v0_derive_key(struct eap_sm *sm, |
| struct eap_ttls_data *data) |
| { |
| eap_ttls_free_key(data); |
| data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, |
| "ttls keying material", |
| EAP_TLS_KEY_LEN + |
| EAP_EMSK_LEN); |
| if (!data->key_data) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Failed to derive key"); |
| return -1; |
| } |
| |
| wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived key", |
| data->key_data, EAP_TLS_KEY_LEN); |
| wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: Derived EMSK", |
| data->key_data + EAP_TLS_KEY_LEN, |
| EAP_EMSK_LEN); |
| |
| os_free(data->session_id); |
| data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl, |
| EAP_TYPE_TTLS, |
| &data->id_len); |
| if (data->session_id) { |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Derived Session-Id", |
| data->session_id, data->id_len); |
| } else { |
| wpa_printf(MSG_ERROR, "EAP-TTLS: Failed to derive Session-Id"); |
| } |
| |
| return 0; |
| } |
| |
| |
| static u8 * eap_ttls_implicit_challenge(struct eap_sm *sm, |
| struct eap_ttls_data *data, size_t len) |
| { |
| return eap_peer_tls_derive_key(sm, &data->ssl, "ttls challenge", len); |
| } |
| |
| |
| static void eap_ttls_phase2_select_eap_method(struct eap_ttls_data *data, |
| u8 method) |
| { |
| size_t i; |
| for (i = 0; i < data->num_phase2_eap_types; i++) { |
| if (data->phase2_eap_types[i].vendor != EAP_VENDOR_IETF || |
| data->phase2_eap_types[i].method != method) |
| continue; |
| |
| data->phase2_eap_type.vendor = |
| data->phase2_eap_types[i].vendor; |
| data->phase2_eap_type.method = |
| data->phase2_eap_types[i].method; |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected " |
| "Phase 2 EAP vendor %d method %d", |
| data->phase2_eap_type.vendor, |
| data->phase2_eap_type.method); |
| break; |
| } |
| } |
| |
| |
| static int eap_ttls_phase2_eap_process(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct eap_hdr *hdr, size_t len, |
| struct wpabuf **resp) |
| { |
| struct wpabuf msg; |
| struct eap_method_ret iret; |
| |
| os_memset(&iret, 0, sizeof(iret)); |
| wpabuf_set(&msg, hdr, len); |
| *resp = data->phase2_method->process(sm, data->phase2_priv, &iret, |
| &msg); |
| if ((iret.methodState == METHOD_DONE || |
| iret.methodState == METHOD_MAY_CONT) && |
| (iret.decision == DECISION_UNCOND_SUCC || |
| iret.decision == DECISION_COND_SUCC || |
| iret.decision == DECISION_FAIL)) { |
| ret->methodState = iret.methodState; |
| ret->decision = iret.decision; |
| } |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_phase2_request_eap_method(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct eap_hdr *hdr, size_t len, |
| u8 method, struct wpabuf **resp) |
| { |
| #ifdef EAP_TNC |
| if (data->tnc_started && data->phase2_method && |
| data->phase2_priv && method == EAP_TYPE_TNC && |
| data->phase2_eap_type.method == EAP_TYPE_TNC) |
| return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, |
| resp); |
| |
| if (data->ready_for_tnc && !data->tnc_started && |
| method == EAP_TYPE_TNC) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed " |
| "EAP method"); |
| data->tnc_started = 1; |
| } |
| |
| if (data->tnc_started) { |
| if (data->phase2_eap_type.vendor != EAP_VENDOR_IETF || |
| data->phase2_eap_type.method == EAP_TYPE_TNC) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Unexpected EAP " |
| "type %d for TNC", method); |
| return -1; |
| } |
| |
| data->phase2_eap_type.vendor = EAP_VENDOR_IETF; |
| data->phase2_eap_type.method = method; |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Selected " |
| "Phase 2 EAP vendor %d method %d (TNC)", |
| data->phase2_eap_type.vendor, |
| data->phase2_eap_type.method); |
| |
| if (data->phase2_type == EAP_TTLS_PHASE2_EAP) |
| eap_ttls_phase2_eap_deinit(sm, data); |
| } |
| #endif /* EAP_TNC */ |
| |
| if (data->phase2_eap_type.vendor == EAP_VENDOR_IETF && |
| data->phase2_eap_type.method == EAP_TYPE_NONE) |
| eap_ttls_phase2_select_eap_method(data, method); |
| |
| if (method != data->phase2_eap_type.method || method == EAP_TYPE_NONE) |
| { |
| if (eap_peer_tls_phase2_nak(data->phase2_eap_types, |
| data->num_phase2_eap_types, |
| hdr, resp)) |
| return -1; |
| return 0; |
| } |
| |
| if (data->phase2_priv == NULL) { |
| data->phase2_method = eap_peer_get_eap_method( |
| EAP_VENDOR_IETF, method); |
| if (data->phase2_method) { |
| sm->init_phase2 = 1; |
| data->phase2_priv = data->phase2_method->init(sm); |
| sm->init_phase2 = 0; |
| } |
| } |
| if (data->phase2_priv == NULL || data->phase2_method == NULL) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: failed to initialize " |
| "Phase 2 EAP method %d", method); |
| return -1; |
| } |
| |
| return eap_ttls_phase2_eap_process(sm, data, ret, hdr, len, resp); |
| } |
| |
| |
| static int eap_ttls_phase2_request_eap(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct eap_hdr *hdr, |
| struct wpabuf **resp) |
| { |
| size_t len = be_to_host16(hdr->length); |
| u8 *pos; |
| struct eap_peer_config *config = eap_get_config(sm); |
| |
| if (len <= sizeof(struct eap_hdr)) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: too short " |
| "Phase 2 request (len=%lu)", (unsigned long) len); |
| return -1; |
| } |
| pos = (u8 *) (hdr + 1); |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP Request: type=%d", *pos); |
| switch (*pos) { |
| case EAP_TYPE_IDENTITY: |
| *resp = eap_sm_buildIdentity(sm, hdr->identifier, 1); |
| break; |
| default: |
| if (eap_ttls_phase2_request_eap_method(sm, data, ret, hdr, len, |
| *pos, resp) < 0) |
| return -1; |
| break; |
| } |
| |
| if (*resp == NULL && |
| (config->pending_req_identity || config->pending_req_password || |
| config->pending_req_otp)) { |
| return 0; |
| } |
| |
| if (*resp == NULL) |
| return -1; |
| |
| wpa_hexdump_buf(MSG_DEBUG, "EAP-TTLS: AVP encapsulate EAP Response", |
| *resp); |
| return eap_ttls_avp_encapsulate(resp, RADIUS_ATTR_EAP_MESSAGE, 1); |
| } |
| |
| |
| static int eap_ttls_phase2_request_mschapv2(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct wpabuf **resp) |
| { |
| #ifdef EAP_MSCHAPv2 |
| struct wpabuf *msg; |
| u8 *buf, *pos, *challenge, *peer_challenge; |
| const u8 *identity, *password; |
| size_t identity_len, password_len; |
| int pwhash; |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAPV2 Request"); |
| |
| identity = eap_get_config_identity(sm, &identity_len); |
| password = eap_get_config_password2(sm, &password_len, &pwhash); |
| if (identity == NULL || password == NULL) |
| return -1; |
| |
| msg = wpabuf_alloc(identity_len + 1000); |
| if (msg == NULL) { |
| wpa_printf(MSG_ERROR, |
| "EAP-TTLS/MSCHAPV2: Failed to allocate memory"); |
| return -1; |
| } |
| pos = buf = wpabuf_mhead(msg); |
| |
| /* User-Name */ |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, |
| identity, identity_len); |
| |
| /* MS-CHAP-Challenge */ |
| challenge = eap_ttls_implicit_challenge( |
| sm, data, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN + 1); |
| if (challenge == NULL) { |
| wpabuf_free(msg); |
| wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive " |
| "implicit challenge"); |
| return -1; |
| } |
| |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, |
| RADIUS_VENDOR_ID_MICROSOFT, 1, |
| challenge, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN); |
| |
| /* MS-CHAP2-Response */ |
| pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP2_RESPONSE, |
| RADIUS_VENDOR_ID_MICROSOFT, 1, |
| EAP_TTLS_MSCHAPV2_RESPONSE_LEN); |
| data->ident = challenge[EAP_TTLS_MSCHAPV2_CHALLENGE_LEN]; |
| *pos++ = data->ident; |
| *pos++ = 0; /* Flags */ |
| if (os_get_random(pos, EAP_TTLS_MSCHAPV2_CHALLENGE_LEN) < 0) { |
| os_free(challenge); |
| wpabuf_free(msg); |
| wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to get " |
| "random data for peer challenge"); |
| return -1; |
| } |
| peer_challenge = pos; |
| pos += EAP_TTLS_MSCHAPV2_CHALLENGE_LEN; |
| os_memset(pos, 0, 8); /* Reserved, must be zero */ |
| pos += 8; |
| if (mschapv2_derive_response(identity, identity_len, password, |
| password_len, pwhash, challenge, |
| peer_challenge, pos, data->auth_response, |
| data->master_key)) { |
| os_free(challenge); |
| wpabuf_free(msg); |
| wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAPV2: Failed to derive " |
| "response"); |
| return -1; |
| } |
| data->auth_response_valid = 1; |
| |
| pos += 24; |
| os_free(challenge); |
| AVP_PAD(buf, pos); |
| |
| wpabuf_put(msg, pos - buf); |
| *resp = msg; |
| |
| return 0; |
| #else /* EAP_MSCHAPv2 */ |
| wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build"); |
| return -1; |
| #endif /* EAP_MSCHAPv2 */ |
| } |
| |
| |
| static int eap_ttls_phase2_request_mschap(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct wpabuf **resp) |
| { |
| struct wpabuf *msg; |
| u8 *buf, *pos, *challenge; |
| const u8 *identity, *password; |
| size_t identity_len, password_len; |
| int pwhash; |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 MSCHAP Request"); |
| |
| identity = eap_get_config_identity(sm, &identity_len); |
| password = eap_get_config_password2(sm, &password_len, &pwhash); |
| if (identity == NULL || password == NULL) |
| return -1; |
| |
| msg = wpabuf_alloc(identity_len + 1000); |
| if (msg == NULL) { |
| wpa_printf(MSG_ERROR, |
| "EAP-TTLS/MSCHAP: Failed to allocate memory"); |
| return -1; |
| } |
| pos = buf = wpabuf_mhead(msg); |
| |
| /* User-Name */ |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, |
| identity, identity_len); |
| |
| /* MS-CHAP-Challenge */ |
| challenge = eap_ttls_implicit_challenge( |
| sm, data, EAP_TTLS_MSCHAP_CHALLENGE_LEN + 1); |
| if (challenge == NULL) { |
| wpabuf_free(msg); |
| wpa_printf(MSG_ERROR, "EAP-TTLS/MSCHAP: Failed to derive " |
| "implicit challenge"); |
| return -1; |
| } |
| |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_MS_CHAP_CHALLENGE, |
| RADIUS_VENDOR_ID_MICROSOFT, 1, |
| challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); |
| |
| /* MS-CHAP-Response */ |
| pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_MS_CHAP_RESPONSE, |
| RADIUS_VENDOR_ID_MICROSOFT, 1, |
| EAP_TTLS_MSCHAP_RESPONSE_LEN); |
| data->ident = challenge[EAP_TTLS_MSCHAP_CHALLENGE_LEN]; |
| *pos++ = data->ident; |
| *pos++ = 1; /* Flags: Use NT style passwords */ |
| os_memset(pos, 0, 24); /* LM-Response */ |
| pos += 24; |
| if (pwhash) { |
| challenge_response(challenge, password, pos); /* NT-Response */ |
| wpa_hexdump_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password hash", |
| password, 16); |
| } else { |
| nt_challenge_response(challenge, password, password_len, |
| pos); /* NT-Response */ |
| wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: MSCHAP password", |
| password, password_len); |
| } |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP implicit challenge", |
| challenge, EAP_TTLS_MSCHAP_CHALLENGE_LEN); |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: MSCHAP response", pos, 24); |
| pos += 24; |
| os_free(challenge); |
| AVP_PAD(buf, pos); |
| |
| wpabuf_put(msg, pos - buf); |
| *resp = msg; |
| |
| /* EAP-TTLS/MSCHAP does not provide tunneled success |
| * notification, so assume that Phase2 succeeds. */ |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_COND_SUCC; |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_phase2_request_pap(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct wpabuf **resp) |
| { |
| struct wpabuf *msg; |
| u8 *buf, *pos; |
| size_t pad; |
| const u8 *identity, *password; |
| size_t identity_len, password_len; |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 PAP Request"); |
| |
| identity = eap_get_config_identity(sm, &identity_len); |
| password = eap_get_config_password(sm, &password_len); |
| if (identity == NULL || password == NULL) |
| return -1; |
| |
| msg = wpabuf_alloc(identity_len + password_len + 100); |
| if (msg == NULL) { |
| wpa_printf(MSG_ERROR, |
| "EAP-TTLS/PAP: Failed to allocate memory"); |
| return -1; |
| } |
| pos = buf = wpabuf_mhead(msg); |
| |
| /* User-Name */ |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, |
| identity, identity_len); |
| |
| /* User-Password; in RADIUS, this is encrypted, but EAP-TTLS encrypts |
| * the data, so no separate encryption is used in the AVP itself. |
| * However, the password is padded to obfuscate its length. */ |
| pad = password_len == 0 ? 16 : (16 - (password_len & 15)) & 15; |
| pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_USER_PASSWORD, 0, 1, |
| password_len + pad); |
| os_memcpy(pos, password, password_len); |
| pos += password_len; |
| os_memset(pos, 0, pad); |
| pos += pad; |
| AVP_PAD(buf, pos); |
| |
| wpabuf_put(msg, pos - buf); |
| *resp = msg; |
| |
| /* EAP-TTLS/PAP does not provide tunneled success notification, |
| * so assume that Phase2 succeeds. */ |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_COND_SUCC; |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_phase2_request_chap(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct wpabuf **resp) |
| { |
| struct wpabuf *msg; |
| u8 *buf, *pos, *challenge; |
| const u8 *identity, *password; |
| size_t identity_len, password_len; |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Phase 2 CHAP Request"); |
| |
| identity = eap_get_config_identity(sm, &identity_len); |
| password = eap_get_config_password(sm, &password_len); |
| if (identity == NULL || password == NULL) |
| return -1; |
| |
| msg = wpabuf_alloc(identity_len + 1000); |
| if (msg == NULL) { |
| wpa_printf(MSG_ERROR, |
| "EAP-TTLS/CHAP: Failed to allocate memory"); |
| return -1; |
| } |
| pos = buf = wpabuf_mhead(msg); |
| |
| /* User-Name */ |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_USER_NAME, 0, 1, |
| identity, identity_len); |
| |
| /* CHAP-Challenge */ |
| challenge = eap_ttls_implicit_challenge( |
| sm, data, EAP_TTLS_CHAP_CHALLENGE_LEN + 1); |
| if (challenge == NULL) { |
| wpabuf_free(msg); |
| wpa_printf(MSG_ERROR, "EAP-TTLS/CHAP: Failed to derive " |
| "implicit challenge"); |
| return -1; |
| } |
| |
| pos = eap_ttls_avp_add(buf, pos, RADIUS_ATTR_CHAP_CHALLENGE, 0, 1, |
| challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); |
| |
| /* CHAP-Password */ |
| pos = eap_ttls_avp_hdr(pos, RADIUS_ATTR_CHAP_PASSWORD, 0, 1, |
| 1 + EAP_TTLS_CHAP_PASSWORD_LEN); |
| data->ident = challenge[EAP_TTLS_CHAP_CHALLENGE_LEN]; |
| *pos++ = data->ident; |
| |
| /* MD5(Ident + Password + Challenge) */ |
| chap_md5(data->ident, password, password_len, challenge, |
| EAP_TTLS_CHAP_CHALLENGE_LEN, pos); |
| |
| wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: CHAP username", |
| identity, identity_len); |
| wpa_hexdump_ascii_key(MSG_DEBUG, "EAP-TTLS: CHAP password", |
| password, password_len); |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP implicit challenge", |
| challenge, EAP_TTLS_CHAP_CHALLENGE_LEN); |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: CHAP password", |
| pos, EAP_TTLS_CHAP_PASSWORD_LEN); |
| pos += EAP_TTLS_CHAP_PASSWORD_LEN; |
| os_free(challenge); |
| AVP_PAD(buf, pos); |
| |
| wpabuf_put(msg, pos - buf); |
| *resp = msg; |
| |
| /* EAP-TTLS/CHAP does not provide tunneled success |
| * notification, so assume that Phase2 succeeds. */ |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_COND_SUCC; |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_phase2_request(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct eap_hdr *hdr, |
| struct wpabuf **resp) |
| { |
| int res = 0; |
| size_t len; |
| enum phase2_types phase2_type = data->phase2_type; |
| |
| #ifdef EAP_TNC |
| if (data->tnc_started) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Processing TNC"); |
| phase2_type = EAP_TTLS_PHASE2_EAP; |
| } |
| #endif /* EAP_TNC */ |
| |
| if (phase2_type == EAP_TTLS_PHASE2_MSCHAPV2 || |
| phase2_type == EAP_TTLS_PHASE2_MSCHAP || |
| phase2_type == EAP_TTLS_PHASE2_PAP || |
| phase2_type == EAP_TTLS_PHASE2_CHAP) { |
| if (eap_get_config_identity(sm, &len) == NULL) { |
| wpa_printf(MSG_INFO, |
| "EAP-TTLS: Identity not configured"); |
| eap_sm_request_identity(sm); |
| if (eap_get_config_password(sm, &len) == NULL) |
| eap_sm_request_password(sm); |
| return 0; |
| } |
| |
| if (eap_get_config_password(sm, &len) == NULL) { |
| wpa_printf(MSG_INFO, |
| "EAP-TTLS: Password not configured"); |
| eap_sm_request_password(sm); |
| return 0; |
| } |
| } |
| |
| switch (phase2_type) { |
| case EAP_TTLS_PHASE2_EAP: |
| res = eap_ttls_phase2_request_eap(sm, data, ret, hdr, resp); |
| break; |
| case EAP_TTLS_PHASE2_MSCHAPV2: |
| res = eap_ttls_phase2_request_mschapv2(sm, data, ret, resp); |
| break; |
| case EAP_TTLS_PHASE2_MSCHAP: |
| res = eap_ttls_phase2_request_mschap(sm, data, ret, resp); |
| break; |
| case EAP_TTLS_PHASE2_PAP: |
| res = eap_ttls_phase2_request_pap(sm, data, ret, resp); |
| break; |
| case EAP_TTLS_PHASE2_CHAP: |
| res = eap_ttls_phase2_request_chap(sm, data, ret, resp); |
| break; |
| default: |
| wpa_printf(MSG_ERROR, "EAP-TTLS: Phase 2 - Unknown"); |
| res = -1; |
| break; |
| } |
| |
| if (res < 0) { |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_FAIL; |
| } |
| |
| return res; |
| } |
| |
| |
| struct ttls_parse_avp { |
| u8 *mschapv2; |
| u8 *eapdata; |
| size_t eap_len; |
| int mschapv2_error; |
| }; |
| |
| |
| static int eap_ttls_parse_attr_eap(const u8 *dpos, size_t dlen, |
| struct ttls_parse_avp *parse) |
| { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP - EAP Message"); |
| if (parse->eapdata == NULL) { |
| parse->eapdata = os_malloc(dlen); |
| if (parse->eapdata == NULL) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate " |
| "memory for Phase 2 EAP data"); |
| return -1; |
| } |
| os_memcpy(parse->eapdata, dpos, dlen); |
| parse->eap_len = dlen; |
| } else { |
| u8 *neweap = os_realloc(parse->eapdata, parse->eap_len + dlen); |
| if (neweap == NULL) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Failed to allocate " |
| "memory for Phase 2 EAP data"); |
| return -1; |
| } |
| os_memcpy(neweap + parse->eap_len, dpos, dlen); |
| parse->eapdata = neweap; |
| parse->eap_len += dlen; |
| } |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_parse_avp(u8 *pos, size_t left, |
| struct ttls_parse_avp *parse) |
| { |
| struct ttls_avp *avp; |
| u32 avp_code, avp_length, vendor_id = 0; |
| u8 avp_flags, *dpos; |
| size_t dlen; |
| |
| avp = (struct ttls_avp *) pos; |
| avp_code = be_to_host32(avp->avp_code); |
| avp_length = be_to_host32(avp->avp_length); |
| avp_flags = (avp_length >> 24) & 0xff; |
| avp_length &= 0xffffff; |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP: code=%d flags=0x%02x " |
| "length=%d", (int) avp_code, avp_flags, |
| (int) avp_length); |
| |
| if (avp_length > left) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: AVP overflow " |
| "(len=%d, left=%lu) - dropped", |
| (int) avp_length, (unsigned long) left); |
| return -1; |
| } |
| |
| if (avp_length < sizeof(*avp)) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid AVP length %d", |
| avp_length); |
| return -1; |
| } |
| |
| dpos = (u8 *) (avp + 1); |
| dlen = avp_length - sizeof(*avp); |
| if (avp_flags & AVP_FLAGS_VENDOR) { |
| if (dlen < 4) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Vendor AVP " |
| "underflow"); |
| return -1; |
| } |
| vendor_id = WPA_GET_BE32(dpos); |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: AVP vendor_id %d", |
| (int) vendor_id); |
| dpos += 4; |
| dlen -= 4; |
| } |
| |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: AVP data", dpos, dlen); |
| |
| if (vendor_id == 0 && avp_code == RADIUS_ATTR_EAP_MESSAGE) { |
| if (eap_ttls_parse_attr_eap(dpos, dlen, parse) < 0) |
| return -1; |
| } else if (vendor_id == 0 && avp_code == RADIUS_ATTR_REPLY_MESSAGE) { |
| /* This is an optional message that can be displayed to |
| * the user. */ |
| wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: AVP - Reply-Message", |
| dpos, dlen); |
| } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && |
| avp_code == RADIUS_ATTR_MS_CHAP2_SUCCESS) { |
| wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP2-Success", |
| dpos, dlen); |
| if (dlen != 43) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Unexpected " |
| "MS-CHAP2-Success length " |
| "(len=%lu, expected 43)", |
| (unsigned long) dlen); |
| return -1; |
| } |
| parse->mschapv2 = dpos; |
| } else if (vendor_id == RADIUS_VENDOR_ID_MICROSOFT && |
| avp_code == RADIUS_ATTR_MS_CHAP_ERROR) { |
| wpa_hexdump_ascii(MSG_DEBUG, "EAP-TTLS: MS-CHAP-Error", |
| dpos, dlen); |
| parse->mschapv2_error = 1; |
| } else if (avp_flags & AVP_FLAGS_MANDATORY) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Unsupported mandatory AVP " |
| "code %d vendor_id %d - dropped", |
| (int) avp_code, (int) vendor_id); |
| return -1; |
| } else { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Ignoring unsupported AVP " |
| "code %d vendor_id %d", |
| (int) avp_code, (int) vendor_id); |
| } |
| |
| return avp_length; |
| } |
| |
| |
| static int eap_ttls_parse_avps(struct wpabuf *in_decrypted, |
| struct ttls_parse_avp *parse) |
| { |
| u8 *pos; |
| size_t left, pad; |
| int avp_length; |
| |
| pos = wpabuf_mhead(in_decrypted); |
| left = wpabuf_len(in_decrypted); |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Decrypted Phase 2 AVPs", pos, left); |
| if (left < sizeof(struct ttls_avp)) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 AVP frame" |
| " len=%lu expected %lu or more - dropped", |
| (unsigned long) left, |
| (unsigned long) sizeof(struct ttls_avp)); |
| return -1; |
| } |
| |
| /* Parse AVPs */ |
| os_memset(parse, 0, sizeof(*parse)); |
| |
| while (left > 0) { |
| avp_length = eap_ttls_parse_avp(pos, left, parse); |
| if (avp_length < 0) |
| return -1; |
| |
| pad = (4 - (avp_length & 3)) & 3; |
| pos += avp_length + pad; |
| if (left < avp_length + pad) |
| left = 0; |
| else |
| left -= avp_length + pad; |
| } |
| |
| return 0; |
| } |
| |
| |
| static u8 * eap_ttls_fake_identity_request(void) |
| { |
| struct eap_hdr *hdr; |
| u8 *buf; |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: empty data in beginning of " |
| "Phase 2 - use fake EAP-Request Identity"); |
| buf = os_malloc(sizeof(*hdr) + 1); |
| if (buf == NULL) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: failed to allocate " |
| "memory for fake EAP-Identity Request"); |
| return NULL; |
| } |
| |
| hdr = (struct eap_hdr *) buf; |
| hdr->code = EAP_CODE_REQUEST; |
| hdr->identifier = 0; |
| hdr->length = host_to_be16(sizeof(*hdr) + 1); |
| buf[sizeof(*hdr)] = EAP_TYPE_IDENTITY; |
| |
| return buf; |
| } |
| |
| |
| static int eap_ttls_encrypt_response(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct wpabuf *resp, u8 identifier, |
| struct wpabuf **out_data) |
| { |
| if (resp == NULL) |
| return 0; |
| |
| wpa_hexdump_buf_key(MSG_DEBUG, "EAP-TTLS: Encrypting Phase 2 data", |
| resp); |
| if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS, |
| data->ttls_version, identifier, |
| resp, out_data)) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Failed to encrypt a Phase 2 " |
| "frame"); |
| wpabuf_free(resp); |
| return -1; |
| } |
| wpabuf_free(resp); |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_process_phase2_eap(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct ttls_parse_avp *parse, |
| struct wpabuf **resp) |
| { |
| struct eap_hdr *hdr; |
| size_t len; |
| |
| if (parse->eapdata == NULL) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: No EAP Message in the " |
| "packet - dropped"); |
| return -1; |
| } |
| |
| wpa_hexdump(MSG_DEBUG, "EAP-TTLS: Phase 2 EAP", |
| parse->eapdata, parse->eap_len); |
| hdr = (struct eap_hdr *) parse->eapdata; |
| |
| if (parse->eap_len < sizeof(*hdr)) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Too short Phase 2 EAP " |
| "frame (len=%lu, expected %lu or more) - dropped", |
| (unsigned long) parse->eap_len, |
| (unsigned long) sizeof(*hdr)); |
| return -1; |
| } |
| len = be_to_host16(hdr->length); |
| if (len > parse->eap_len) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Length mismatch in Phase 2 " |
| "EAP frame (EAP hdr len=%lu, EAP data len in " |
| "AVP=%lu)", |
| (unsigned long) len, |
| (unsigned long) parse->eap_len); |
| return -1; |
| } |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: received Phase 2: code=%d " |
| "identifier=%d length=%lu", |
| hdr->code, hdr->identifier, (unsigned long) len); |
| switch (hdr->code) { |
| case EAP_CODE_REQUEST: |
| if (eap_ttls_phase2_request(sm, data, ret, hdr, resp)) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request " |
| "processing failed"); |
| return -1; |
| } |
| break; |
| default: |
| wpa_printf(MSG_INFO, "EAP-TTLS: Unexpected code=%d in " |
| "Phase 2 EAP header", hdr->code); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_process_phase2_mschapv2(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct ttls_parse_avp *parse) |
| { |
| #ifdef EAP_MSCHAPv2 |
| if (parse->mschapv2_error) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS/MSCHAPV2: Received " |
| "MS-CHAP-Error - failed"); |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_FAIL; |
| /* Reply with empty data to ACK error */ |
| return 1; |
| } |
| |
| if (parse->mschapv2 == NULL) { |
| #ifdef EAP_TNC |
| if (data->phase2_success && parse->eapdata) { |
| /* |
| * Allow EAP-TNC to be started after successfully |
| * completed MSCHAPV2. |
| */ |
| return 1; |
| } |
| #endif /* EAP_TNC */ |
| wpa_printf(MSG_WARNING, "EAP-TTLS: no MS-CHAP2-Success AVP " |
| "received for Phase2 MSCHAPV2"); |
| return -1; |
| } |
| if (parse->mschapv2[0] != data->ident) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Ident mismatch for Phase 2 " |
| "MSCHAPV2 (received Ident 0x%02x, expected 0x%02x)", |
| parse->mschapv2[0], data->ident); |
| return -1; |
| } |
| if (!data->auth_response_valid || |
| mschapv2_verify_auth_response(data->auth_response, |
| parse->mschapv2 + 1, 42)) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: Invalid authenticator " |
| "response in Phase 2 MSCHAPV2 success request"); |
| return -1; |
| } |
| |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 MSCHAPV2 " |
| "authentication succeeded"); |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_UNCOND_SUCC; |
| data->phase2_success = 1; |
| |
| /* |
| * Reply with empty data; authentication server will reply |
| * with EAP-Success after this. |
| */ |
| return 1; |
| #else /* EAP_MSCHAPv2 */ |
| wpa_printf(MSG_ERROR, "EAP-TTLS: MSCHAPv2 not included in the build"); |
| return -1; |
| #endif /* EAP_MSCHAPv2 */ |
| } |
| |
| |
| #ifdef EAP_TNC |
| static int eap_ttls_process_tnc_start(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| struct ttls_parse_avp *parse, |
| struct wpabuf **resp) |
| { |
| /* TNC uses inner EAP method after non-EAP TTLS phase 2. */ |
| if (parse->eapdata == NULL) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received " |
| "unexpected tunneled data (no EAP)"); |
| return -1; |
| } |
| |
| if (!data->ready_for_tnc) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received " |
| "EAP after non-EAP, but not ready for TNC"); |
| return -1; |
| } |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Start TNC after completed " |
| "non-EAP method"); |
| data->tnc_started = 1; |
| |
| if (eap_ttls_process_phase2_eap(sm, data, ret, parse, resp) < 0) |
| return -1; |
| |
| return 0; |
| } |
| #endif /* EAP_TNC */ |
| |
| |
| static int eap_ttls_process_decrypted(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| u8 identifier, |
| struct ttls_parse_avp *parse, |
| struct wpabuf *in_decrypted, |
| struct wpabuf **out_data) |
| { |
| struct wpabuf *resp = NULL; |
| struct eap_peer_config *config = eap_get_config(sm); |
| int res; |
| enum phase2_types phase2_type = data->phase2_type; |
| |
| #ifdef EAP_TNC |
| if (data->tnc_started) |
| phase2_type = EAP_TTLS_PHASE2_EAP; |
| #endif /* EAP_TNC */ |
| |
| switch (phase2_type) { |
| case EAP_TTLS_PHASE2_EAP: |
| if (eap_ttls_process_phase2_eap(sm, data, ret, parse, &resp) < |
| 0) |
| return -1; |
| break; |
| case EAP_TTLS_PHASE2_MSCHAPV2: |
| res = eap_ttls_process_phase2_mschapv2(sm, data, ret, parse); |
| #ifdef EAP_TNC |
| if (res == 1 && parse->eapdata && data->phase2_success) { |
| /* |
| * TNC may be required as the next |
| * authentication method within the tunnel. |
| */ |
| ret->methodState = METHOD_MAY_CONT; |
| data->ready_for_tnc = 1; |
| if (eap_ttls_process_tnc_start(sm, data, ret, parse, |
| &resp) == 0) |
| break; |
| } |
| #endif /* EAP_TNC */ |
| return res; |
| case EAP_TTLS_PHASE2_MSCHAP: |
| case EAP_TTLS_PHASE2_PAP: |
| case EAP_TTLS_PHASE2_CHAP: |
| #ifdef EAP_TNC |
| if (eap_ttls_process_tnc_start(sm, data, ret, parse, &resp) < |
| 0) |
| return -1; |
| break; |
| #else /* EAP_TNC */ |
| /* EAP-TTLS/{MSCHAP,PAP,CHAP} should not send any TLS tunneled |
| * requests to the supplicant */ |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase 2 received unexpected " |
| "tunneled data"); |
| return -1; |
| #endif /* EAP_TNC */ |
| } |
| |
| if (resp) { |
| if (eap_ttls_encrypt_response(sm, data, resp, identifier, |
| out_data) < 0) |
| return -1; |
| } else if (config->pending_req_identity || |
| config->pending_req_password || |
| config->pending_req_otp || |
| config->pending_req_new_password) { |
| wpabuf_free(data->pending_phase2_req); |
| data->pending_phase2_req = wpabuf_dup(in_decrypted); |
| } |
| |
| return 0; |
| } |
| |
| |
| static int eap_ttls_implicit_identity_request(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| u8 identifier, |
| struct wpabuf **out_data) |
| { |
| int retval = 0; |
| struct eap_hdr *hdr; |
| struct wpabuf *resp; |
| |
| hdr = (struct eap_hdr *) eap_ttls_fake_identity_request(); |
| if (hdr == NULL) { |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_FAIL; |
| return -1; |
| } |
| |
| resp = NULL; |
| if (eap_ttls_phase2_request(sm, data, ret, hdr, &resp)) { |
| wpa_printf(MSG_INFO, "EAP-TTLS: Phase2 Request " |
| "processing failed"); |
| retval = -1; |
| } else { |
| struct eap_peer_config *config = eap_get_config(sm); |
| if (resp == NULL && |
| (config->pending_req_identity || |
| config->pending_req_password || |
| config->pending_req_otp || |
| config->pending_req_new_password)) { |
| /* |
| * Use empty buffer to force implicit request |
| * processing when EAP request is re-processed after |
| * user input. |
| */ |
| wpabuf_free(data->pending_phase2_req); |
| data->pending_phase2_req = wpabuf_alloc(0); |
| } |
| |
| retval = eap_ttls_encrypt_response(sm, data, resp, identifier, |
| out_data); |
| } |
| |
| os_free(hdr); |
| |
| if (retval < 0) { |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_FAIL; |
| } |
| |
| return retval; |
| } |
| |
| |
| static int eap_ttls_phase2_start(struct eap_sm *sm, struct eap_ttls_data *data, |
| struct eap_method_ret *ret, u8 identifier, |
| struct wpabuf **out_data) |
| { |
| data->phase2_start = 0; |
| |
| /* |
| * EAP-TTLS does not use Phase2 on fast re-auth; this must be done only |
| * if TLS part was indeed resuming a previous session. Most |
| * Authentication Servers terminate EAP-TTLS before reaching this |
| * point, but some do not. Make wpa_supplicant stop phase 2 here, if |
| * needed. |
| */ |
| if (data->reauth && |
| tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Session resumption - " |
| "skip phase 2"); |
| *out_data = eap_peer_tls_build_ack(identifier, EAP_TYPE_TTLS, |
| data->ttls_version); |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_UNCOND_SUCC; |
| data->phase2_success = 1; |
| return 0; |
| } |
| |
| return eap_ttls_implicit_identity_request(sm, data, ret, identifier, |
| out_data); |
| } |
| |
| |
| static int eap_ttls_decrypt(struct eap_sm *sm, struct eap_ttls_data *data, |
| struct eap_method_ret *ret, u8 identifier, |
| const struct wpabuf *in_data, |
| struct wpabuf **out_data) |
| { |
| struct wpabuf *in_decrypted = NULL; |
| int retval = 0; |
| struct ttls_parse_avp parse; |
| |
| os_memset(&parse, 0, sizeof(parse)); |
| |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: received %lu bytes encrypted data for" |
| " Phase 2", |
| in_data ? (unsigned long) wpabuf_len(in_data) : 0); |
| |
| if (data->pending_phase2_req) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Pending Phase 2 request - " |
| "skip decryption and use old data"); |
| /* Clear TLS reassembly state. */ |
| eap_peer_tls_reset_input(&data->ssl); |
| |
| in_decrypted = data->pending_phase2_req; |
| data->pending_phase2_req = NULL; |
| if (wpabuf_len(in_decrypted) == 0) { |
| wpabuf_free(in_decrypted); |
| return eap_ttls_implicit_identity_request( |
| sm, data, ret, identifier, out_data); |
| } |
| goto continue_req; |
| } |
| |
| if ((in_data == NULL || wpabuf_len(in_data) == 0) && |
| data->phase2_start) { |
| return eap_ttls_phase2_start(sm, data, ret, identifier, |
| out_data); |
| } |
| |
| if (in_data == NULL || wpabuf_len(in_data) == 0) { |
| /* Received TLS ACK - requesting more fragments */ |
| return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_TTLS, |
| data->ttls_version, |
| identifier, NULL, out_data); |
| } |
| |
| retval = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted); |
| if (retval) |
| goto done; |
| |
| continue_req: |
| data->phase2_start = 0; |
| |
| if (eap_ttls_parse_avps(in_decrypted, &parse) < 0) { |
| retval = -1; |
| goto done; |
| } |
| |
| retval = eap_ttls_process_decrypted(sm, data, ret, identifier, |
| &parse, in_decrypted, out_data); |
| |
| done: |
| wpabuf_free(in_decrypted); |
| os_free(parse.eapdata); |
| |
| if (retval < 0) { |
| ret->methodState = METHOD_DONE; |
| ret->decision = DECISION_FAIL; |
| } |
| |
| return retval; |
| } |
| |
| |
| static int eap_ttls_process_handshake(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret, |
| u8 identifier, |
| const u8 *in_data, size_t in_len, |
| struct wpabuf **out_data) |
| { |
| int res; |
| |
| res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS, |
| data->ttls_version, identifier, |
| in_data, in_len, out_data); |
| |
| if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to " |
| "Phase 2"); |
| if (data->resuming) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: fast reauth - may " |
| "skip Phase 2"); |
| ret->decision = DECISION_COND_SUCC; |
| ret->methodState = METHOD_MAY_CONT; |
| } |
| data->phase2_start = 1; |
| eap_ttls_v0_derive_key(sm, data); |
| |
| if (*out_data == NULL || wpabuf_len(*out_data) == 0) { |
| if (eap_ttls_decrypt(sm, data, ret, identifier, |
| NULL, out_data)) { |
| wpa_printf(MSG_WARNING, "EAP-TTLS: " |
| "failed to process early " |
| "start for Phase 2"); |
| } |
| res = 0; |
| } |
| data->resuming = 0; |
| } |
| |
| if (res == 2) { |
| struct wpabuf msg; |
| /* |
| * Application data included in the handshake message. |
| */ |
| wpabuf_free(data->pending_phase2_req); |
| data->pending_phase2_req = *out_data; |
| *out_data = NULL; |
| wpabuf_set(&msg, in_data, in_len); |
| res = eap_ttls_decrypt(sm, data, ret, identifier, &msg, |
| out_data); |
| } |
| |
| return res; |
| } |
| |
| |
| static void eap_ttls_check_auth_status(struct eap_sm *sm, |
| struct eap_ttls_data *data, |
| struct eap_method_ret *ret) |
| { |
| if (ret->methodState == METHOD_DONE) { |
| ret->allowNotifications = FALSE; |
| if (ret->decision == DECISION_UNCOND_SUCC || |
| ret->decision == DECISION_COND_SUCC) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " |
| "completed successfully"); |
| data->phase2_success = 1; |
| #ifdef EAP_TNC |
| if (!data->ready_for_tnc && !data->tnc_started) { |
| /* |
| * TNC may be required as the next |
| * authentication method within the tunnel. |
| */ |
| ret->methodState = METHOD_MAY_CONT; |
| data->ready_for_tnc = 1; |
| } |
| #endif /* EAP_TNC */ |
| } |
| } else if (ret->methodState == METHOD_MAY_CONT && |
| (ret->decision == DECISION_UNCOND_SUCC || |
| ret->decision == DECISION_COND_SUCC)) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Authentication " |
| "completed successfully (MAY_CONT)"); |
| data->phase2_success = 1; |
| } |
| } |
| |
| |
| static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv, |
| struct eap_method_ret *ret, |
| const struct wpabuf *reqData) |
| { |
| size_t left; |
| int res; |
| u8 flags, id; |
| struct wpabuf *resp; |
| const u8 *pos; |
| struct eap_ttls_data *data = priv; |
| |
| pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret, |
| reqData, &left, &flags); |
| if (pos == NULL) |
| return NULL; |
| id = eap_get_id(reqData); |
| |
| if (flags & EAP_TLS_FLAGS_START) { |
| wpa_printf(MSG_DEBUG, "EAP-TTLS: Start (server ver=%d, own " |
| "ver=%d)", flags & EAP_TLS_VERSION_MASK, |
| data->ttls_version); |
| |
| /* RFC 5281, Ch. 9.2: |
| * "This packet MAY contain additional information in the form |
| * of AVPs, which may provide useful hints to the client" |
| * For now, ignore any potential extra data. |
| */ |
| left = 0; |
| } |
| |
| resp = NULL; |
| if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) && |
| !data->resuming) { |
| struct wpabuf msg; |
| wpabuf_set(&msg, pos, left); |
| res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp); |
| } else { |
| res = eap_ttls_process_handshake(sm, data, ret, id, |
| pos, left, &resp); |
| } |
| |
| eap_ttls_check_auth_status(sm, data, ret); |
| |
| /* FIX: what about res == -1? Could just move all error processing into |
| * the other functions and get rid of this res==1 case here. */ |
| if (res == 1) { |
| wpabuf_free(resp); |
| return eap_peer_tls_build_ack(id, EAP_TYPE_TTLS, |
| data->ttls_version); |
| } |
| return resp; |
| } |
| |
| |
| static Boolean eap_ttls_has_reauth_data(struct eap_sm *sm, void *priv) |
| { |
| struct eap_ttls_data *data = priv; |
| return tls_connection_established(sm->ssl_ctx, data->ssl.conn) && |
| data->phase2_success; |
| } |
| |
| |
| static void eap_ttls_deinit_for_reauth(struct eap_sm *sm, void *priv) |
| { |
| struct eap_ttls_data *data = priv; |
| wpabuf_free(data->pending_phase2_req); |
| data->pending_phase2_req = NULL; |
| #ifdef EAP_TNC |
| data->ready_for_tnc = 0; |
| data->tnc_started = 0; |
| #endif /* EAP_TNC */ |
| } |
| |
| |
| static void * eap_ttls_init_for_reauth(struct eap_sm *sm, void *priv) |
| { |
| struct eap_ttls_data *data = priv; |
| eap_ttls_free_key(data); |
| os_free(data->session_id); |
| data->session_id = NULL; |
| if (eap_peer_tls_reauth_init(sm, &data->ssl)) { |
| os_free(data); |
| return NULL; |
| } |
| if (data->phase2_priv && data->phase2_method && |
| data->phase2_method->init_for_reauth) |
| data->phase2_method->init_for_reauth(sm, data->phase2_priv); |
| data->phase2_start = 0; |
| data->phase2_success = 0; |
| data->resuming = 1; |
| data->reauth = 1; |
| return priv; |
| } |
| |
| |
| static int eap_ttls_get_status(struct eap_sm *sm, void *priv, char *buf, |
| size_t buflen, int verbose) |
| { |
| struct eap_ttls_data *data = priv; |
| int len, ret; |
| |
| len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); |
| ret = os_snprintf(buf + len, buflen - len, |
| "EAP-TTLSv%d Phase2 method=", |
| data->ttls_version); |
| if (os_snprintf_error(buflen - len, ret)) |
| return len; |
| len += ret; |
| switch (data->phase2_type) { |
| case EAP_TTLS_PHASE2_EAP: |
| ret = os_snprintf(buf + len, buflen - len, "EAP-%s\n", |
| data->phase2_method ? |
| data->phase2_method->name : "?"); |
| break; |
| case EAP_TTLS_PHASE2_MSCHAPV2: |
| ret = os_snprintf(buf + len, buflen - len, "MSCHAPV2\n"); |
| break; |
| case EAP_TTLS_PHASE2_MSCHAP: |
| ret = os_snprintf(buf + len, buflen - len, "MSCHAP\n"); |
| break; |
| case EAP_TTLS_PHASE2_PAP: |
| ret = os_snprintf(buf + len, buflen - len, "PAP\n"); |
| break; |
| case EAP_TTLS_PHASE2_CHAP: |
| ret = os_snprintf(buf + len, buflen - len, "CHAP\n"); |
| break; |
| default: |
| ret = 0; |
| break; |
| } |
| if (os_snprintf_error(buflen - len, ret)) |
| return len; |
| len += ret; |
| |
| return len; |
| } |
| |
| |
| static Boolean eap_ttls_isKeyAvailable(struct eap_sm *sm, void *priv) |
| { |
| struct eap_ttls_data *data = priv; |
| return data->key_data != NULL && data->phase2_success; |
| } |
| |
| |
| static u8 * eap_ttls_getKey(struct eap_sm *sm, void *priv, size_t *len) |
| { |
| struct eap_ttls_data *data = priv; |
| u8 *key; |
| |
| if (data->key_data == NULL || !data->phase2_success) |
| return NULL; |
| |
| key = os_malloc(EAP_TLS_KEY_LEN); |
| if (key == NULL) |
| return NULL; |
| |
| *len = EAP_TLS_KEY_LEN; |
| os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN); |
| |
| return key; |
| } |
| |
| |
| static u8 * eap_ttls_get_session_id(struct eap_sm *sm, void *priv, size_t *len) |
| { |
| struct eap_ttls_data *data = priv; |
| u8 *id; |
| |
| if (data->session_id == NULL || !data->phase2_success) |
| return NULL; |
| |
| id = os_malloc(data->id_len); |
| if (id == NULL) |
| return NULL; |
| |
| *len = data->id_len; |
| os_memcpy(id, data->session_id, data->id_len); |
| |
| return id; |
| } |
| |
| |
| static u8 * eap_ttls_get_emsk(struct eap_sm *sm, void *priv, size_t *len) |
| { |
| struct eap_ttls_data *data = priv; |
| u8 *key; |
| |
| if (data->key_data == NULL) |
| return NULL; |
| |
| key = os_malloc(EAP_EMSK_LEN); |
| if (key == NULL) |
| return NULL; |
| |
| *len = EAP_EMSK_LEN; |
| os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN); |
| |
| return key; |
| } |
| |
| |
| int eap_peer_ttls_register(void) |
| { |
| struct eap_method *eap; |
| int ret; |
| |
| eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, |
| EAP_VENDOR_IETF, EAP_TYPE_TTLS, "TTLS"); |
| if (eap == NULL) |
| return -1; |
| |
| eap->init = eap_ttls_init; |
| eap->deinit = eap_ttls_deinit; |
| eap->process = eap_ttls_process; |
| eap->isKeyAvailable = eap_ttls_isKeyAvailable; |
| eap->getKey = eap_ttls_getKey; |
| eap->getSessionId = eap_ttls_get_session_id; |
| eap->get_status = eap_ttls_get_status; |
| eap->has_reauth_data = eap_ttls_has_reauth_data; |
| eap->deinit_for_reauth = eap_ttls_deinit_for_reauth; |
| eap->init_for_reauth = eap_ttls_init_for_reauth; |
| eap->get_emsk = eap_ttls_get_emsk; |
| |
| ret = eap_peer_method_register(eap); |
| if (ret) |
| eap_peer_method_free(eap); |
| return ret; |
| } |