/* * EAP peer: EAP-TLS/PEAP/TTLS/FAST common functions * Copyright (c) 2004-2019, Jouni Malinen * * 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/sha1.h" #include "crypto/tls.h" #include "eap_i.h" #include "eap_tls_common.h" #include "eap_config.h" static struct wpabuf * eap_tls_msg_alloc(enum eap_type type, size_t payload_len, u8 code, u8 identifier) { if (type == EAP_UNAUTH_TLS_TYPE) return eap_msg_alloc(EAP_VENDOR_UNAUTH_TLS, EAP_VENDOR_TYPE_UNAUTH_TLS, payload_len, code, identifier); if (type == EAP_WFA_UNAUTH_TLS_TYPE) return eap_msg_alloc(EAP_VENDOR_WFA_NEW, EAP_VENDOR_WFA_UNAUTH_TLS, payload_len, code, identifier); return eap_msg_alloc(EAP_VENDOR_IETF, type, payload_len, code, identifier); } static int eap_tls_check_blob(struct eap_sm *sm, const char **name, const u8 **data, size_t *data_len) { const struct wpa_config_blob *blob; if (*name == NULL || os_strncmp(*name, "blob://", 7) != 0) return 0; blob = eap_get_config_blob(sm, *name + 7); if (blob == NULL) { wpa_printf(MSG_ERROR, "%s: Named configuration blob '%s' not " "found", __func__, *name + 7); return -1; } *name = NULL; *data = blob->data; *data_len = blob->len; return 0; } static void eap_tls_params_flags(struct tls_connection_params *params, const char *txt) { if (txt == NULL) return; if (os_strstr(txt, "tls_allow_md5=1")) params->flags |= TLS_CONN_ALLOW_SIGN_RSA_MD5; if (os_strstr(txt, "tls_disable_time_checks=1")) params->flags |= TLS_CONN_DISABLE_TIME_CHECKS; if (os_strstr(txt, "tls_disable_session_ticket=1")) params->flags |= TLS_CONN_DISABLE_SESSION_TICKET; if (os_strstr(txt, "tls_disable_session_ticket=0")) params->flags &= ~TLS_CONN_DISABLE_SESSION_TICKET; if (os_strstr(txt, "tls_disable_tlsv1_0=1")) params->flags |= TLS_CONN_DISABLE_TLSv1_0; if (os_strstr(txt, "tls_disable_tlsv1_0=0")) { params->flags &= ~TLS_CONN_DISABLE_TLSv1_0; params->flags |= TLS_CONN_ENABLE_TLSv1_0; } if (os_strstr(txt, "tls_disable_tlsv1_1=1")) params->flags |= TLS_CONN_DISABLE_TLSv1_1; if (os_strstr(txt, "tls_disable_tlsv1_1=0")) { params->flags &= ~TLS_CONN_DISABLE_TLSv1_1; params->flags |= TLS_CONN_ENABLE_TLSv1_1; } if (os_strstr(txt, "tls_disable_tlsv1_2=1")) params->flags |= TLS_CONN_DISABLE_TLSv1_2; if (os_strstr(txt, "tls_disable_tlsv1_2=0")) { params->flags &= ~TLS_CONN_DISABLE_TLSv1_2; params->flags |= TLS_CONN_ENABLE_TLSv1_2; } if (os_strstr(txt, "tls_disable_tlsv1_3=1")) params->flags |= TLS_CONN_DISABLE_TLSv1_3; if (os_strstr(txt, "tls_disable_tlsv1_3=0")) params->flags &= ~TLS_CONN_DISABLE_TLSv1_3; if (os_strstr(txt, "tls_ext_cert_check=1")) params->flags |= TLS_CONN_EXT_CERT_CHECK; if (os_strstr(txt, "tls_ext_cert_check=0")) params->flags &= ~TLS_CONN_EXT_CERT_CHECK; if (os_strstr(txt, "tls_suiteb=1")) params->flags |= TLS_CONN_SUITEB; if (os_strstr(txt, "tls_suiteb=0")) params->flags &= ~TLS_CONN_SUITEB; if (os_strstr(txt, "tls_suiteb_no_ecdh=1")) params->flags |= TLS_CONN_SUITEB_NO_ECDH; if (os_strstr(txt, "tls_suiteb_no_ecdh=0")) params->flags &= ~TLS_CONN_SUITEB_NO_ECDH; if (os_strstr(txt, "allow_unsafe_renegotiation=1")) params->flags |= TLS_CONN_ALLOW_UNSAFE_RENEGOTIATION; if (os_strstr(txt, "allow_unsafe_renegotiation=0")) params->flags &= ~TLS_CONN_ALLOW_UNSAFE_RENEGOTIATION; } static void eap_tls_cert_params_from_conf(struct tls_connection_params *params, struct eap_peer_cert_config *config) { params->ca_cert = config->ca_cert; params->ca_path = config->ca_path; params->client_cert = config->client_cert; params->private_key = config->private_key; params->private_key_passwd = config->private_key_passwd; params->subject_match = config->subject_match; params->altsubject_match = config->altsubject_match; params->check_cert_subject = config->check_cert_subject; params->suffix_match = config->domain_suffix_match; params->domain_match = config->domain_match; params->engine = config->engine; params->engine_id = config->engine_id; params->pin = config->pin; params->key_id = config->key_id; params->cert_id = config->cert_id; params->ca_cert_id = config->ca_cert_id; if (config->ocsp) params->flags |= TLS_CONN_REQUEST_OCSP; if (config->ocsp >= 2) params->flags |= TLS_CONN_REQUIRE_OCSP; if (config->ocsp == 3) params->flags |= TLS_CONN_REQUIRE_OCSP_ALL; } static void eap_tls_params_from_conf1(struct tls_connection_params *params, struct eap_peer_config *config) { eap_tls_cert_params_from_conf(params, &config->cert); eap_tls_params_flags(params, config->phase1); } static void eap_tls_params_from_conf2(struct tls_connection_params *params, struct eap_peer_config *config) { eap_tls_cert_params_from_conf(params, &config->phase2_cert); eap_tls_params_flags(params, config->phase2); } static void eap_tls_params_from_conf2m(struct tls_connection_params *params, struct eap_peer_config *config) { eap_tls_cert_params_from_conf(params, &config->machine_cert); eap_tls_params_flags(params, config->machine_phase2); } static int eap_tls_params_from_conf(struct eap_sm *sm, struct eap_ssl_data *data, struct tls_connection_params *params, struct eap_peer_config *config, int phase2) { os_memset(params, 0, sizeof(*params)); if (sm->workaround && data->eap_type != EAP_TYPE_FAST && data->eap_type != EAP_TYPE_TEAP) { /* * Some deployed authentication servers seem to be unable to * handle the TLS Session Ticket extension (they are supposed * to ignore unrecognized TLS extensions, but end up rejecting * the ClientHello instead). As a workaround, disable use of * TLS Sesson Ticket extension for EAP-TLS, EAP-PEAP, and * EAP-TTLS (EAP-FAST uses session ticket, so any server that * supports EAP-FAST does not need this workaround). */ params->flags |= TLS_CONN_DISABLE_SESSION_TICKET; } if (data->eap_type == EAP_TYPE_TEAP) { /* RFC 7170 requires TLS v1.2 or newer to be used with TEAP */ params->flags |= TLS_CONN_DISABLE_TLSv1_0 | TLS_CONN_DISABLE_TLSv1_1; if (config->teap_anon_dh) params->flags |= TLS_CONN_TEAP_ANON_DH; } if (data->eap_type == EAP_TYPE_FAST || data->eap_type == EAP_TYPE_TEAP || data->eap_type == EAP_TYPE_TTLS || data->eap_type == EAP_TYPE_PEAP) { /* The current EAP peer implementation is not yet ready for the * TLS v1.3 changes, so disable this by default for now. */ params->flags |= TLS_CONN_DISABLE_TLSv1_3; } #ifndef EAP_TLSV1_3 if (data->eap_type == EAP_TYPE_TLS || data->eap_type == EAP_UNAUTH_TLS_TYPE || data->eap_type == EAP_WFA_UNAUTH_TLS_TYPE) { /* While the current EAP-TLS implementation is more or less * complete for TLS v1.3, there has been only minimal * interoperability testing with other implementations, so * disable it by default for now until there has been chance to * confirm that no significant interoperability issues show up * with TLS version update. */ params->flags |= TLS_CONN_DISABLE_TLSv1_3; } #endif /* EAP_TLSV1_3 */ if (phase2 && sm->use_machine_cred) { wpa_printf(MSG_DEBUG, "TLS: using machine config options"); eap_tls_params_from_conf2m(params, config); } else if (phase2) { wpa_printf(MSG_DEBUG, "TLS: using phase2 config options"); eap_tls_params_from_conf2(params, config); } else { wpa_printf(MSG_DEBUG, "TLS: using phase1 config options"); eap_tls_params_from_conf1(params, config); if (data->eap_type == EAP_TYPE_FAST) params->flags |= TLS_CONN_EAP_FAST; } /* * Use blob data, if available. Otherwise, leave reference to external * file as-is. */ if (eap_tls_check_blob(sm, ¶ms->ca_cert, ¶ms->ca_cert_blob, ¶ms->ca_cert_blob_len) || eap_tls_check_blob(sm, ¶ms->client_cert, ¶ms->client_cert_blob, ¶ms->client_cert_blob_len) || eap_tls_check_blob(sm, ¶ms->private_key, ¶ms->private_key_blob, ¶ms->private_key_blob_len)) { wpa_printf(MSG_INFO, "SSL: Failed to get configuration blobs"); return -1; } params->openssl_ciphers = config->openssl_ciphers; sm->ext_cert_check = !!(params->flags & TLS_CONN_EXT_CERT_CHECK); if (!phase2) data->client_cert_conf = params->client_cert || params->client_cert_blob || params->private_key || params->private_key_blob; return 0; } static int eap_tls_init_connection(struct eap_sm *sm, struct eap_ssl_data *data, struct eap_peer_config *config, struct tls_connection_params *params) { int res; data->conn = tls_connection_init(data->ssl_ctx); if (data->conn == NULL) { wpa_printf(MSG_INFO, "SSL: Failed to initialize new TLS " "connection"); return -1; } res = tls_connection_set_params(data->ssl_ctx, data->conn, params); if (res == TLS_SET_PARAMS_ENGINE_PRV_BAD_PIN) { /* * At this point with the pkcs11 engine the PIN is wrong. We * reset the PIN in the configuration to be sure to not use it * again and the calling function must request a new one. */ wpa_printf(MSG_INFO, "TLS: Bad PIN provided, requesting a new one"); os_free(config->cert.pin); config->cert.pin = NULL; eap_sm_request_pin(sm); sm->ignore = true; } else if (res == TLS_SET_PARAMS_ENGINE_PRV_INIT_FAILED) { wpa_printf(MSG_INFO, "TLS: Failed to initialize engine"); } else if (res == TLS_SET_PARAMS_ENGINE_PRV_VERIFY_FAILED) { wpa_printf(MSG_INFO, "TLS: Failed to load private key"); sm->ignore = true; } if (res) { wpa_printf(MSG_INFO, "TLS: Failed to set TLS connection " "parameters"); tls_connection_deinit(data->ssl_ctx, data->conn); data->conn = NULL; return -1; } return 0; } /** * eap_peer_tls_ssl_init - Initialize shared TLS functionality * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @config: Pointer to the network configuration * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST) * Returns: 0 on success, -1 on failure * * This function is used to initialize shared TLS functionality for EAP-TLS, * EAP-PEAP, EAP-TTLS, and EAP-FAST. */ int eap_peer_tls_ssl_init(struct eap_sm *sm, struct eap_ssl_data *data, struct eap_peer_config *config, u8 eap_type) { struct tls_connection_params params; if (config == NULL) return -1; data->eap = sm; data->eap_type = eap_type; data->phase2 = sm->init_phase2; data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 : sm->ssl_ctx; if (eap_tls_params_from_conf(sm, data, ¶ms, config, data->phase2) < 0) return -1; if (eap_tls_init_connection(sm, data, config, ¶ms) < 0) return -1; data->tls_out_limit = config->fragment_size; if (data->phase2) { /* Limit the fragment size in the inner TLS authentication * since the outer authentication with EAP-PEAP does not yet * support fragmentation */ if (data->tls_out_limit > 100) data->tls_out_limit -= 100; } if (config->phase1 && os_strstr(config->phase1, "include_tls_length=1")) { wpa_printf(MSG_DEBUG, "TLS: Include TLS Message Length in " "unfragmented packets"); data->include_tls_length = 1; } return 0; } /** * eap_peer_tls_ssl_deinit - Deinitialize shared TLS functionality * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * * This function deinitializes shared TLS functionality that was initialized * with eap_peer_tls_ssl_init(). */ void eap_peer_tls_ssl_deinit(struct eap_sm *sm, struct eap_ssl_data *data) { tls_connection_deinit(data->ssl_ctx, data->conn); eap_peer_tls_reset_input(data); eap_peer_tls_reset_output(data); } /** * eap_peer_tls_derive_key - Derive a key based on TLS session data * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @label: Label string for deriving the keys, e.g., "client EAP encryption" * @context: Optional extra upper-layer context (max len 2^16) * @context_len: The length of the context value * @len: Length of the key material to generate (usually 64 for MSK) * Returns: Pointer to allocated key on success or %NULL on failure * * This function uses TLS-PRF to generate pseudo-random data based on the TLS * session data (client/server random and master key). Each key type may use a * different label to bind the key usage into the generated material. * * The caller is responsible for freeing the returned buffer. * * Note: To provide the RFC 5705 context, the context variable must be non-NULL. */ u8 * eap_peer_tls_derive_key(struct eap_sm *sm, struct eap_ssl_data *data, const char *label, const u8 *context, size_t context_len, size_t len) { u8 *out; out = os_malloc(len); if (out == NULL) return NULL; if (tls_connection_export_key(data->ssl_ctx, data->conn, label, context, context_len, out, len)) { os_free(out); return NULL; } return out; } /** * eap_peer_tls_derive_session_id - Derive a Session-Id based on TLS data * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @eap_type: EAP method used in Phase 1 (EAP_TYPE_TLS/PEAP/TTLS/FAST) * @len: Pointer to length of the session ID generated * Returns: Pointer to allocated Session-Id on success or %NULL on failure * * This function derive the Session-Id based on the TLS session data * (client/server random and method type). * * The caller is responsible for freeing the returned buffer. */ u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm, struct eap_ssl_data *data, u8 eap_type, size_t *len) { struct tls_random keys; u8 *out; if (data->tls_v13) { u8 *id, *method_id; const u8 context[] = { eap_type }; /* Session-Id = || Method-Id * Method-Id = TLS-Exporter("EXPORTER_EAP_TLS_Method-Id", * Type-Code, 64) */ *len = 1 + 64; id = os_malloc(*len); if (!id) return NULL; method_id = eap_peer_tls_derive_key( sm, data, "EXPORTER_EAP_TLS_Method-Id", context, 1, 64); if (!method_id) { os_free(id); return NULL; } id[0] = eap_type; os_memcpy(id + 1, method_id, 64); os_free(method_id); return id; } if (tls_connection_get_random(sm->ssl_ctx, data->conn, &keys) || keys.client_random == NULL || keys.server_random == NULL) return NULL; *len = 1 + keys.client_random_len + keys.server_random_len; out = os_malloc(*len); if (out == NULL) return NULL; /* Session-Id = EAP type || client.random || server.random */ out[0] = eap_type; os_memcpy(out + 1, keys.client_random, keys.client_random_len); os_memcpy(out + 1 + keys.client_random_len, keys.server_random, keys.server_random_len); return out; } /** * eap_peer_tls_reassemble_fragment - Reassemble a received fragment * @data: Data for TLS processing * @in_data: Next incoming TLS segment * Returns: 0 on success, 1 if more data is needed for the full message, or * -1 on error */ static int eap_peer_tls_reassemble_fragment(struct eap_ssl_data *data, const struct wpabuf *in_data) { size_t tls_in_len, in_len; tls_in_len = data->tls_in ? wpabuf_len(data->tls_in) : 0; in_len = in_data ? wpabuf_len(in_data) : 0; if (tls_in_len + in_len == 0) { /* No message data received?! */ wpa_printf(MSG_WARNING, "SSL: Invalid reassembly state: " "tls_in_left=%lu tls_in_len=%lu in_len=%lu", (unsigned long) data->tls_in_left, (unsigned long) tls_in_len, (unsigned long) in_len); eap_peer_tls_reset_input(data); return -1; } if (tls_in_len + in_len > 65536) { /* * Limit length to avoid rogue servers from causing large * memory allocations. */ wpa_printf(MSG_INFO, "SSL: Too long TLS fragment (size over " "64 kB)"); eap_peer_tls_reset_input(data); return -1; } if (in_len > data->tls_in_left) { /* Sender is doing something odd - reject message */ wpa_printf(MSG_INFO, "SSL: more data than TLS message length " "indicated"); eap_peer_tls_reset_input(data); return -1; } if (wpabuf_resize(&data->tls_in, in_len) < 0) { wpa_printf(MSG_INFO, "SSL: Could not allocate memory for TLS " "data"); eap_peer_tls_reset_input(data); return -1; } if (in_data) wpabuf_put_buf(data->tls_in, in_data); data->tls_in_left -= in_len; if (data->tls_in_left > 0) { wpa_printf(MSG_DEBUG, "SSL: Need %lu bytes more input " "data", (unsigned long) data->tls_in_left); return 1; } return 0; } /** * eap_peer_tls_data_reassemble - Reassemble TLS data * @data: Data for TLS processing * @in_data: Next incoming TLS segment * @need_more_input: Variable for returning whether more input data is needed * to reassemble this TLS packet * Returns: Pointer to output data, %NULL on error or when more data is needed * for the full message (in which case, *need_more_input is also set to 1). * * This function reassembles TLS fragments. Caller must not free the returned * data buffer since an internal pointer to it is maintained. */ static const struct wpabuf * eap_peer_tls_data_reassemble( struct eap_ssl_data *data, const struct wpabuf *in_data, int *need_more_input) { *need_more_input = 0; if (data->tls_in_left > wpabuf_len(in_data) || data->tls_in) { /* Message has fragments */ int res = eap_peer_tls_reassemble_fragment(data, in_data); if (res) { if (res == 1) *need_more_input = 1; return NULL; } /* Message is now fully reassembled. */ } else { /* No fragments in this message, so just make a copy of it. */ data->tls_in_left = 0; data->tls_in = wpabuf_dup(in_data); if (data->tls_in == NULL) return NULL; } return data->tls_in; } /** * eap_tls_process_input - Process incoming TLS message * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @in_data: Message received from the server * @out_data: Buffer for returning a pointer to application data (if available) * Returns: 0 on success, 1 if more input data is needed, 2 if application data * is available, -1 on failure */ static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data, const struct wpabuf *in_data, struct wpabuf **out_data) { const struct wpabuf *msg; int need_more_input; struct wpabuf *appl_data; msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input); if (msg == NULL) return need_more_input ? 1 : -1; /* Full TLS message reassembled - continue handshake processing */ if (data->tls_out) { /* This should not happen.. */ wpa_printf(MSG_INFO, "SSL: eap_tls_process_input - pending " "tls_out data even though tls_out_len = 0"); wpabuf_free(data->tls_out); WPA_ASSERT(data->tls_out == NULL); } appl_data = NULL; data->tls_out = tls_connection_handshake(data->ssl_ctx, data->conn, msg, &appl_data); eap_peer_tls_reset_input(data); if (appl_data && tls_connection_established(data->ssl_ctx, data->conn) && !tls_connection_get_failed(data->ssl_ctx, data->conn)) { wpa_hexdump_buf_key(MSG_MSGDUMP, "SSL: Application data", appl_data); *out_data = appl_data; return 2; } wpabuf_free(appl_data); return 0; } /** * eap_tls_process_output - Process outgoing TLS message * @data: Data for TLS processing * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) * @peap_version: Version number for EAP-PEAP/TTLS * @id: EAP identifier for the response * @ret: Return value to use on success * @out_data: Buffer for returning the allocated output buffer * Returns: ret (0 or 1) on success, -1 on failure */ static int eap_tls_process_output(struct eap_ssl_data *data, enum eap_type eap_type, int peap_version, u8 id, int ret, struct wpabuf **out_data) { size_t len; u8 *flags; int more_fragments, length_included; if (data->tls_out == NULL) return -1; len = wpabuf_len(data->tls_out) - data->tls_out_pos; wpa_printf(MSG_DEBUG, "SSL: %lu bytes left to be sent out (of total " "%lu bytes)", (unsigned long) len, (unsigned long) wpabuf_len(data->tls_out)); /* * Limit outgoing message to the configured maximum size. Fragment * message if needed. */ if (len > data->tls_out_limit) { more_fragments = 1; len = data->tls_out_limit; wpa_printf(MSG_DEBUG, "SSL: sending %lu bytes, more fragments " "will follow", (unsigned long) len); } else more_fragments = 0; length_included = data->tls_out_pos == 0 && (wpabuf_len(data->tls_out) > data->tls_out_limit || data->include_tls_length); if (!length_included && eap_type == EAP_TYPE_PEAP && peap_version == 0 && !tls_connection_established(data->eap->ssl_ctx, data->conn)) { /* * Windows Server 2008 NPS really wants to have the TLS Message * length included in phase 0 even for unfragmented frames or * it will get very confused with Compound MAC calculation and * Outer TLVs. */ length_included = 1; } *out_data = eap_tls_msg_alloc(eap_type, 1 + length_included * 4 + len, EAP_CODE_RESPONSE, id); if (*out_data == NULL) return -1; flags = wpabuf_put(*out_data, 1); *flags = peap_version; if (more_fragments) *flags |= EAP_TLS_FLAGS_MORE_FRAGMENTS; if (length_included) { *flags |= EAP_TLS_FLAGS_LENGTH_INCLUDED; wpabuf_put_be32(*out_data, wpabuf_len(data->tls_out)); } wpabuf_put_data(*out_data, wpabuf_head_u8(data->tls_out) + data->tls_out_pos, len); data->tls_out_pos += len; if (!more_fragments) eap_peer_tls_reset_output(data); return ret; } /** * eap_peer_tls_process_helper - Process TLS handshake message * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) * @peap_version: Version number for EAP-PEAP/TTLS * @id: EAP identifier for the response * @in_data: Message received from the server * @out_data: Buffer for returning a pointer to the response message * Returns: 0 on success, 1 if more input data is needed, 2 if application data * is available, or -1 on failure * * This function can be used to process TLS handshake messages. It reassembles * the received fragments and uses a TLS library to process the messages. The * response data from the TLS library is fragmented to suitable output messages * that the caller can send out. * * out_data is used to return the response message if the return value of this * function is 0, 2, or -1. In case of failure, the message is likely a TLS * alarm message. The caller is responsible for freeing the allocated buffer if * *out_data is not %NULL. * * This function is called for each received TLS message during the TLS * handshake after eap_peer_tls_process_init() call and possible processing of * TLS Flags field. Once the handshake has been completed, i.e., when * tls_connection_established() returns 1, EAP method specific decrypting of * the tunneled data is used. */ int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data, enum eap_type eap_type, int peap_version, u8 id, const struct wpabuf *in_data, struct wpabuf **out_data) { int ret = 0; *out_data = NULL; if (data->tls_out && wpabuf_len(data->tls_out) > 0 && wpabuf_len(in_data) > 0) { wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output " "fragments are waiting to be sent out"); return -1; } if (data->tls_out == NULL || wpabuf_len(data->tls_out) == 0) { /* * No more data to send out - expect to receive more data from * the AS. */ int res = eap_tls_process_input(sm, data, in_data, out_data); char buf[20]; if (res) { /* * Input processing failed (res = -1) or more data is * needed (res = 1). */ return res; } /* * The incoming message has been reassembled and processed. The * response was allocated into data->tls_out buffer. */ if (tls_get_version(data->ssl_ctx, data->conn, buf, sizeof(buf)) == 0) { wpa_printf(MSG_DEBUG, "SSL: Using TLS version %s", buf); data->tls_v13 = os_strcmp(buf, "TLSv1.3") == 0; } } if (data->tls_out == NULL) { /* * No outgoing fragments remaining from the previous message * and no new message generated. This indicates an error in TLS * processing. */ eap_peer_tls_reset_output(data); return -1; } if (tls_connection_get_failed(data->ssl_ctx, data->conn)) { /* TLS processing has failed - return error */ wpa_printf(MSG_DEBUG, "SSL: Failed - tls_out available to " "report error (len=%u)", (unsigned int) wpabuf_len(data->tls_out)); ret = -1; /* TODO: clean pin if engine used? */ if (wpabuf_len(data->tls_out) == 0) { wpabuf_free(data->tls_out); data->tls_out = NULL; return -1; } } if (wpabuf_len(data->tls_out) == 0) { /* * TLS negotiation should now be complete since all other cases * needing more data should have been caught above based on * the TLS Message Length field. */ wpa_printf(MSG_DEBUG, "SSL: No data to be sent out"); wpabuf_free(data->tls_out); data->tls_out = NULL; return 1; } /* Send the pending message (in fragments, if needed). */ return eap_tls_process_output(data, eap_type, peap_version, id, ret, out_data); } /** * eap_peer_tls_build_ack - Build a TLS ACK frame * @id: EAP identifier for the response * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) * @peap_version: Version number for EAP-PEAP/TTLS * Returns: Pointer to the allocated ACK frame or %NULL on failure */ struct wpabuf * eap_peer_tls_build_ack(u8 id, enum eap_type eap_type, int peap_version) { struct wpabuf *resp; resp = eap_tls_msg_alloc(eap_type, 1, EAP_CODE_RESPONSE, id); if (resp == NULL) return NULL; wpa_printf(MSG_DEBUG, "SSL: Building ACK (type=%d id=%d ver=%d)", (int) eap_type, id, peap_version); wpabuf_put_u8(resp, peap_version); /* Flags */ return resp; } /** * eap_peer_tls_reauth_init - Re-initialize shared TLS for session resumption * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * Returns: 0 on success, -1 on failure */ int eap_peer_tls_reauth_init(struct eap_sm *sm, struct eap_ssl_data *data) { eap_peer_tls_reset_input(data); eap_peer_tls_reset_output(data); return tls_connection_shutdown(data->ssl_ctx, data->conn); } /** * eap_peer_tls_status - Get TLS status * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @buf: Buffer for status information * @buflen: Maximum buffer length * @verbose: Whether to include verbose status information * Returns: Number of bytes written to buf. */ int eap_peer_tls_status(struct eap_sm *sm, struct eap_ssl_data *data, char *buf, size_t buflen, int verbose) { char version[20], name[128]; int len = 0, ret; if (tls_get_version(data->ssl_ctx, data->conn, version, sizeof(version)) < 0) version[0] = '\0'; if (tls_get_cipher(data->ssl_ctx, data->conn, name, sizeof(name)) < 0) name[0] = '\0'; ret = os_snprintf(buf + len, buflen - len, "eap_tls_version=%s\n" "EAP TLS cipher=%s\n" "tls_session_reused=%d\n", version, name, tls_connection_resumed(data->ssl_ctx, data->conn)); if (os_snprintf_error(buflen - len, ret)) return len; len += ret; return len; } /** * eap_peer_tls_process_init - Initial validation/processing of EAP requests * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) * @ret: Return values from EAP request validation and processing * @reqData: EAP request to be processed (eapReqData) * @len: Buffer for returning length of the remaining payload * @flags: Buffer for returning TLS flags * Returns: Pointer to payload after TLS flags and length or %NULL on failure * * This function validates the EAP header and processes the optional TLS * Message Length field. If this is the first fragment of a TLS message, the * TLS reassembly code is initialized to receive the indicated number of bytes. * * EAP-TLS, EAP-PEAP, EAP-TTLS, and EAP-FAST methods are expected to use this * function as the first step in processing received messages. They will need * to process the flags (apart from Message Length Included) that are returned * through the flags pointer and the message payload that will be returned (and * the length is returned through the len pointer). Return values (ret) are set * for continuation of EAP method processing. The caller is responsible for * setting these to indicate completion (either success or failure) based on * the authentication result. */ const u8 * eap_peer_tls_process_init(struct eap_sm *sm, struct eap_ssl_data *data, enum eap_type eap_type, struct eap_method_ret *ret, const struct wpabuf *reqData, size_t *len, u8 *flags) { const u8 *pos; size_t left; unsigned int tls_msg_len; if (tls_get_errors(data->ssl_ctx)) { wpa_printf(MSG_INFO, "SSL: TLS errors detected"); ret->ignore = true; return NULL; } if (eap_type == EAP_UNAUTH_TLS_TYPE) pos = eap_hdr_validate(EAP_VENDOR_UNAUTH_TLS, EAP_VENDOR_TYPE_UNAUTH_TLS, reqData, &left); else if (eap_type == EAP_WFA_UNAUTH_TLS_TYPE) pos = eap_hdr_validate(EAP_VENDOR_WFA_NEW, EAP_VENDOR_WFA_UNAUTH_TLS, reqData, &left); else pos = eap_hdr_validate(EAP_VENDOR_IETF, eap_type, reqData, &left); if (pos == NULL) { ret->ignore = true; return NULL; } if (left == 0) { wpa_printf(MSG_DEBUG, "SSL: Invalid TLS message: no Flags " "octet included"); if (!sm->workaround) { ret->ignore = true; return NULL; } wpa_printf(MSG_DEBUG, "SSL: Workaround - assume no Flags " "indicates ACK frame"); *flags = 0; } else { *flags = *pos++; left--; } wpa_printf(MSG_DEBUG, "SSL: Received packet(len=%lu) - " "Flags 0x%02x", (unsigned long) wpabuf_len(reqData), *flags); if (*flags & EAP_TLS_FLAGS_LENGTH_INCLUDED) { if (left < 4) { wpa_printf(MSG_INFO, "SSL: Short frame with TLS " "length"); ret->ignore = true; return NULL; } tls_msg_len = WPA_GET_BE32(pos); wpa_printf(MSG_DEBUG, "SSL: TLS Message Length: %d", tls_msg_len); if (data->tls_in_left == 0) { data->tls_in_total = tls_msg_len; data->tls_in_left = tls_msg_len; wpabuf_free(data->tls_in); data->tls_in = NULL; } pos += 4; left -= 4; if (left > tls_msg_len) { wpa_printf(MSG_INFO, "SSL: TLS Message Length (%d " "bytes) smaller than this fragment (%d " "bytes)", (int) tls_msg_len, (int) left); ret->ignore = true; return NULL; } } ret->ignore = false; ret->methodState = METHOD_MAY_CONT; ret->decision = DECISION_FAIL; ret->allowNotifications = true; *len = left; return pos; } /** * eap_peer_tls_reset_input - Reset input buffers * @data: Data for TLS processing * * This function frees any allocated memory for input buffers and resets input * state. */ void eap_peer_tls_reset_input(struct eap_ssl_data *data) { data->tls_in_left = data->tls_in_total = 0; wpabuf_free(data->tls_in); data->tls_in = NULL; } /** * eap_peer_tls_reset_output - Reset output buffers * @data: Data for TLS processing * * This function frees any allocated memory for output buffers and resets * output state. */ void eap_peer_tls_reset_output(struct eap_ssl_data *data) { data->tls_out_pos = 0; wpabuf_free(data->tls_out); data->tls_out = NULL; } /** * eap_peer_tls_decrypt - Decrypt received phase 2 TLS message * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @in_data: Message received from the server * @in_decrypted: Buffer for returning a pointer to the decrypted message * Returns: 0 on success, 1 if more input data is needed, or -1 on failure */ int eap_peer_tls_decrypt(struct eap_sm *sm, struct eap_ssl_data *data, const struct wpabuf *in_data, struct wpabuf **in_decrypted) { const struct wpabuf *msg; int need_more_input; msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input); if (msg == NULL) return need_more_input ? 1 : -1; *in_decrypted = tls_connection_decrypt(data->ssl_ctx, data->conn, msg); eap_peer_tls_reset_input(data); if (*in_decrypted == NULL) { wpa_printf(MSG_INFO, "SSL: Failed to decrypt Phase 2 data"); return -1; } return 0; } /** * eap_peer_tls_encrypt - Encrypt phase 2 TLS message * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init() * @data: Data for TLS processing * @eap_type: EAP type (EAP_TYPE_TLS, EAP_TYPE_PEAP, ...) * @peap_version: Version number for EAP-PEAP/TTLS * @id: EAP identifier for the response * @in_data: Plaintext phase 2 data to encrypt or %NULL to continue fragments * @out_data: Buffer for returning a pointer to the encrypted response message * Returns: 0 on success, -1 on failure */ int eap_peer_tls_encrypt(struct eap_sm *sm, struct eap_ssl_data *data, enum eap_type eap_type, int peap_version, u8 id, const struct wpabuf *in_data, struct wpabuf **out_data) { if (in_data) { eap_peer_tls_reset_output(data); data->tls_out = tls_connection_encrypt(data->ssl_ctx, data->conn, in_data); if (data->tls_out == NULL) { wpa_printf(MSG_INFO, "SSL: Failed to encrypt Phase 2 " "data (in_len=%lu)", (unsigned long) wpabuf_len(in_data)); eap_peer_tls_reset_output(data); return -1; } } return eap_tls_process_output(data, eap_type, peap_version, id, 0, out_data); } /** * eap_peer_select_phase2_methods - Select phase 2 EAP method * @config: Pointer to the network configuration * @prefix: 'phase2' configuration prefix, e.g., "auth=" * @types: Buffer for returning allocated list of allowed EAP methods * @num_types: Buffer for returning number of allocated EAP methods * Returns: 0 on success, -1 on failure * * This function is used to parse EAP method list and select allowed methods * for Phase2 authentication. */ int eap_peer_select_phase2_methods(struct eap_peer_config *config, const char *prefix, struct eap_method_type **types, size_t *num_types, int use_machine_cred) { char *start, *pos, *buf; struct eap_method_type *methods = NULL, *_methods; u32 method; size_t num_methods = 0, prefix_len; const char *phase2; if (!config) goto get_defaults; phase2 = use_machine_cred ? config->machine_phase2 : config->phase2; if (!phase2) goto get_defaults; start = buf = os_strdup(phase2); if (buf == NULL) return -1; prefix_len = os_strlen(prefix); while (start && *start != '\0') { int vendor; pos = os_strstr(start, prefix); if (pos == NULL) break; if (start != pos && *(pos - 1) != ' ') { start = pos + prefix_len; continue; } start = pos + prefix_len; pos = os_strchr(start, ' '); if (pos) *pos++ = '\0'; method = eap_get_phase2_type(start, &vendor); if (vendor == EAP_VENDOR_IETF && method == EAP_TYPE_NONE) { wpa_printf(MSG_ERROR, "TLS: Unsupported Phase2 EAP " "method '%s'", start); os_free(methods); os_free(buf); return -1; } else { num_methods++; _methods = os_realloc_array(methods, num_methods, sizeof(*methods)); if (_methods == NULL) { os_free(methods); os_free(buf); return -1; } methods = _methods; methods[num_methods - 1].vendor = vendor; methods[num_methods - 1].method = method; } start = pos; } os_free(buf); get_defaults: if (methods == NULL) methods = eap_get_phase2_types(config, &num_methods); if (methods == NULL) { wpa_printf(MSG_ERROR, "TLS: No Phase2 EAP methods available"); return -1; } wpa_hexdump(MSG_DEBUG, "TLS: Phase2 EAP types", (u8 *) methods, num_methods * sizeof(struct eap_method_type)); *types = methods; *num_types = num_methods; return 0; } /** * eap_peer_tls_phase2_nak - Generate EAP-Nak for Phase 2 * @types: Buffer for returning allocated list of allowed EAP methods * @num_types: Buffer for returning number of allocated EAP methods * @hdr: EAP-Request header (and the following EAP type octet) * @resp: Buffer for returning the EAP-Nak message * Returns: 0 on success, -1 on failure */ int eap_peer_tls_phase2_nak(struct eap_method_type *types, size_t num_types, struct eap_hdr *hdr, struct wpabuf **resp) { u8 *pos = (u8 *) (hdr + 1); size_t i; /* TODO: add support for expanded Nak */ wpa_printf(MSG_DEBUG, "TLS: Phase 2 Request: Nak type=%d", *pos); wpa_hexdump(MSG_DEBUG, "TLS: Allowed Phase2 EAP types", (u8 *) types, num_types * sizeof(struct eap_method_type)); *resp = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_NAK, num_types, EAP_CODE_RESPONSE, hdr->identifier); if (*resp == NULL) return -1; for (i = 0; i < num_types; i++) { if (types[i].vendor == EAP_VENDOR_IETF && types[i].method < 256) wpabuf_put_u8(*resp, types[i].method); } eap_update_len(*resp); return 0; }