eap_fast.c

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				      const struct eap_hdr *req,
				      struct wpabuf *decrypted,
				      struct wpabuf **out_data)
{
	struct wpabuf *resp = NULL, *tmp;
	struct eap_fast_tlv_parse tlv;
	int failed = 0;

	if (eap_fast_parse_decrypted(decrypted, &tlv, &resp) < 0)
		return 0;
	if (resp)
		return eap_fast_encrypt_response(sm, data, resp,
						 req->identifier, out_data);

	if (tlv.result == EAP_TLV_RESULT_FAILURE) {
		resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
		return eap_fast_encrypt_response(sm, data, resp,
						 req->identifier, out_data);
	}

	if (tlv.iresult == EAP_TLV_RESULT_FAILURE) {
		resp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 1);
		return eap_fast_encrypt_response(sm, data, resp,
						 req->identifier, out_data);
	}

	if (tlv.crypto_binding) {
		tmp = eap_fast_process_crypto_binding(sm, data, ret,
						      tlv.crypto_binding,
						      tlv.crypto_binding_len);
		if (tmp == NULL)
			failed = 1;
		else
			resp = wpabuf_concat(resp, tmp);
	}

	if (tlv.iresult == EAP_TLV_RESULT_SUCCESS) {
		tmp = eap_fast_tlv_result(failed ? EAP_TLV_RESULT_FAILURE :
					  EAP_TLV_RESULT_SUCCESS, 1);
		resp = wpabuf_concat(resp, tmp);
	}

	if (tlv.eap_payload_tlv) {
		tmp = eap_fast_process_eap_payload_tlv(
			sm, data, ret, req, tlv.eap_payload_tlv,
			tlv.eap_payload_tlv_len);
		resp = wpabuf_concat(resp, tmp);
	}

	if (tlv.pac && tlv.result != EAP_TLV_RESULT_SUCCESS) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV without Result TLV "
			   "acknowledging success");
		failed = 1;
	} else if (tlv.pac && tlv.result == EAP_TLV_RESULT_SUCCESS) {
		tmp = eap_fast_process_pac(sm, data, ret, tlv.pac,
					   tlv.pac_len);
		resp = wpabuf_concat(resp, tmp);
	}

	if (data->current_pac == NULL && data->provisioning &&
	    !data->anon_provisioning && !tlv.pac &&
	    (tlv.iresult == EAP_TLV_RESULT_SUCCESS ||
	     tlv.result == EAP_TLV_RESULT_SUCCESS)) {
		/*
		 * Need to request Tunnel PAC when using authenticated
		 * provisioning.
		 */
		wpa_printf(MSG_DEBUG, "EAP-FAST: Request Tunnel PAC");
		tmp = eap_fast_pac_request();
		resp = wpabuf_concat(resp, tmp);
	}

	if (tlv.result == EAP_TLV_RESULT_SUCCESS && !failed) {
		tmp = eap_fast_tlv_result(EAP_TLV_RESULT_SUCCESS, 0);
		resp = wpabuf_concat(tmp, resp);
	} else if (failed) {
		tmp = eap_fast_tlv_result(EAP_TLV_RESULT_FAILURE, 0);
		resp = wpabuf_concat(tmp, resp);
	}

	if (resp && tlv.result == EAP_TLV_RESULT_SUCCESS && !failed &&
	    tlv.crypto_binding && data->phase2_success) {
		if (data->anon_provisioning) {
			wpa_printf(MSG_DEBUG, "EAP-FAST: Unauthenticated "
				   "provisioning completed successfully.");
			ret->methodState = METHOD_DONE;
			ret->decision = DECISION_FAIL;
		} else {
			wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
				   "completed successfully.");
			if (data->provisioning)
				ret->methodState = METHOD_MAY_CONT;
			else
				ret->methodState = METHOD_DONE;
			ret->decision = DECISION_UNCOND_SUCC;
		}
	}

	if (resp == NULL) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: No recognized TLVs - send "
			   "empty response packet");
		resp = wpabuf_alloc(1);
	}

	return eap_fast_encrypt_response(sm, data, resp, req->identifier,
					 out_data);
}


static int eap_fast_decrypt(struct eap_sm *sm, struct eap_fast_data *data,
			    struct eap_method_ret *ret,
			    const struct eap_hdr *req,
			    const struct wpabuf *in_data,
			    struct wpabuf **out_data)
{
	struct wpabuf *in_decrypted;
	int res;

	wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
		   " Phase 2", (unsigned long) wpabuf_len(in_data));

	if (data->pending_phase2_req) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: 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;
		goto continue_req;
	}

	if (wpabuf_len(in_data) == 0) {
		/* Received TLS ACK - requesting more fragments */
		return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_FAST,
					    data->fast_version,
					    req->identifier, NULL, out_data);
	}

	res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);
	if (res)
		return res;

continue_req:
	wpa_hexdump_buf(MSG_MSGDUMP, "EAP-FAST: Decrypted Phase 2 TLV(s)",
			in_decrypted);

	if (wpabuf_len(in_decrypted) < 4) {
		wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
			   "TLV frame (len=%lu)",
			   (unsigned long) wpabuf_len(in_decrypted));
		wpabuf_free(in_decrypted);
		return -1;
	}

	res = eap_fast_process_decrypted(sm, data, ret, req,
					 in_decrypted, out_data);

	wpabuf_free(in_decrypted);

	return res;
}


static const u8 * eap_fast_get_a_id(const u8 *buf, size_t len, size_t *id_len)
{
	const u8 *a_id;
	struct pac_tlv_hdr *hdr;

	/*
	 * Parse authority identity (A-ID) from the EAP-FAST/Start. This
	 * supports both raw A-ID and one inside an A-ID TLV.
	 */
	a_id = buf;
	*id_len = len;
	if (len > sizeof(*hdr)) {
		int tlen;
		hdr = (struct pac_tlv_hdr *) buf;
		tlen = be_to_host16(hdr->len);
		if (be_to_host16(hdr->type) == PAC_TYPE_A_ID &&
		    sizeof(*hdr) + tlen <= len) {
			wpa_printf(MSG_DEBUG, "EAP-FAST: A-ID was in TLV "
				   "(Start)");
			a_id = (u8 *) (hdr + 1);
			*id_len = tlen;
		}
	}
	wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: A-ID", a_id, *id_len);

	return a_id;
}


static void eap_fast_select_pac(struct eap_fast_data *data,
				const u8 *a_id, size_t a_id_len)
{
	data->current_pac = eap_fast_get_pac(data->pac, a_id, a_id_len,
					     PAC_TYPE_TUNNEL_PAC);
	if (data->current_pac == NULL) {
		/*
		 * Tunnel PAC was not available for this A-ID. Try to use
		 * Machine Authentication PAC, if one is available.
		 */
		data->current_pac = eap_fast_get_pac(
			data->pac, a_id, a_id_len,
			PAC_TYPE_MACHINE_AUTHENTICATION);
	}

	if (data->current_pac) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: PAC found for this A-ID "
			   "(PAC-Type %d)", data->current_pac->pac_type);
		wpa_hexdump_ascii(MSG_MSGDUMP, "EAP-FAST: A-ID-Info",
				  data->current_pac->a_id_info,
				  data->current_pac->a_id_info_len);
	}
}


static int eap_fast_use_pac_opaque(struct eap_sm *sm,
				   struct eap_fast_data *data,
				   struct eap_fast_pac *pac)
{
	u8 *tlv;
	size_t tlv_len, olen;
	struct eap_tlv_hdr *ehdr;

	olen = pac->pac_opaque_len;
	tlv_len = sizeof(*ehdr) + olen;
	tlv = os_malloc(tlv_len);
	if (tlv) {
		ehdr = (struct eap_tlv_hdr *) tlv;
		ehdr->tlv_type = host_to_be16(PAC_TYPE_PAC_OPAQUE);
		ehdr->length = host_to_be16(olen);
		os_memcpy(ehdr + 1, pac->pac_opaque, olen);
	}
	if (tlv == NULL ||
	    tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
					    TLS_EXT_PAC_OPAQUE,
					    tlv, tlv_len) < 0) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to add PAC-Opaque TLS "
			   "extension");
		os_free(tlv);
		return -1;
	}
	os_free(tlv);

	return 0;
}


static int eap_fast_clear_pac_opaque_ext(struct eap_sm *sm,
					 struct eap_fast_data *data)
{
	if (tls_connection_client_hello_ext(sm->ssl_ctx, data->ssl.conn,
					    TLS_EXT_PAC_OPAQUE, NULL, 0) < 0) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to remove PAC-Opaque "
			   "TLS extension");
		return -1;
	}
	return 0;
}


static int eap_fast_set_provisioning_ciphers(struct eap_sm *sm,
					     struct eap_fast_data *data)
{
	u8 ciphers[5];
	int count = 0;

	if (data->provisioning_allowed & EAP_FAST_PROV_UNAUTH) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling unauthenticated "
			   "provisioning TLS cipher suites");
		ciphers[count++] = TLS_CIPHER_ANON_DH_AES128_SHA;
	}

	if (data->provisioning_allowed & EAP_FAST_PROV_AUTH) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: Enabling authenticated "
			   "provisioning TLS cipher suites");
		ciphers[count++] = TLS_CIPHER_RSA_DHE_AES128_SHA;
		ciphers[count++] = TLS_CIPHER_AES128_SHA;
		ciphers[count++] = TLS_CIPHER_RC4_SHA;
	}

	ciphers[count++] = TLS_CIPHER_NONE;

	if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
					   ciphers)) {
		wpa_printf(MSG_INFO, "EAP-FAST: Could not configure TLS "
			   "cipher suites for provisioning");
		return -1;
	}

	return 0;
}


static int eap_fast_process_start(struct eap_sm *sm,
				  struct eap_fast_data *data, u8 flags,
				  const u8 *pos, size_t left)
{
	const u8 *a_id;
	size_t a_id_len;

	/* EAP-FAST Version negotiation (section 3.1) */
	wpa_printf(MSG_DEBUG, "EAP-FAST: Start (server ver=%d, own ver=%d)",
		   flags & EAP_PEAP_VERSION_MASK, data->fast_version);
	if ((flags & EAP_PEAP_VERSION_MASK) < data->fast_version)
		data->fast_version = flags & EAP_PEAP_VERSION_MASK;
	wpa_printf(MSG_DEBUG, "EAP-FAST: Using FAST version %d",
		   data->fast_version);

	a_id = eap_fast_get_a_id(pos, left, &a_id_len);
	eap_fast_select_pac(data, a_id, a_id_len);

	if (data->resuming && data->current_pac) {
		wpa_printf(MSG_DEBUG, "EAP-FAST: Trying to resume session - "
			   "do not add PAC-Opaque to TLS ClientHello");
		if (eap_fast_clear_pac_opaque_ext(sm, data) < 0)
			return -1;
	} else if (data->current_pac) {
		/*
		 * PAC found for the A-ID and we are not resuming an old
		 * session, so add PAC-Opaque extension to ClientHello.
		 */
		if (eap_fast_use_pac_opaque(sm, data, data->current_pac) < 0)
			return -1;
	} else {
		/* No PAC found, so we must provision one. */
		if (!data->provisioning_allowed) {
			wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found and "
				   "provisioning disabled");
			return -1;
		}
		wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC found - "
			   "starting provisioning");
		if (eap_fast_set_provisioning_ciphers(sm, data) < 0 ||
		    eap_fast_clear_pac_opaque_ext(sm, data) < 0)
			return -1;
		data->provisioning = 1;
	}

	return 0;
}


static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
					struct eap_method_ret *ret,
					const struct wpabuf *reqData)
{
	const struct eap_hdr *req;
	size_t left;
	int res;
	u8 flags, id;
	struct wpabuf *resp;
	const u8 *pos;
	struct eap_fast_data *data = priv;

	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
					reqData, &left, &flags);
	if (pos == NULL)
		return NULL;

	req = wpabuf_head(reqData);
	id = req->identifier;

	if (flags & EAP_TLS_FLAGS_START) {
		if (eap_fast_process_start(sm, data, flags, pos, left) < 0)
			return NULL;

		left = 0; /* A-ID is not used in further packet processing */
	}

	resp = NULL;
	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
	    !data->resuming) {
		/* Process tunneled (encrypted) phase 2 data. */
		struct wpabuf msg;
		wpabuf_set(&msg, pos, left);
		res = eap_fast_decrypt(sm, data, ret, req, &msg, &resp);
		if (res < 0) {
			ret->methodState = METHOD_DONE;
			ret->decision = DECISION_FAIL;
			/*
			 * Ack possible Alert that may have caused failure in
			 * decryption.
			 */
			res = 1;
		}
	} else {
		/* Continue processing TLS handshake (phase 1). */
		res = eap_peer_tls_process_helper(sm, &data->ssl,
						  EAP_TYPE_FAST,
						  data->fast_version, id, pos,
						  left, &resp);

		if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
			char cipher[80];
			wpa_printf(MSG_DEBUG,
				   "EAP-FAST: TLS done, proceed to Phase 2");
			if (data->provisioning &&
			    (!(data->provisioning_allowed &
			       EAP_FAST_PROV_AUTH) ||
			     tls_get_cipher(sm->ssl_ctx, data->ssl.conn,
					    cipher, sizeof(cipher)) < 0 ||
			     os_strstr(cipher, "ADH-") ||
			     os_strstr(cipher, "anon"))) {
				wpa_printf(MSG_DEBUG, "EAP-FAST: Using "
					   "anonymous (unauthenticated) "
					   "provisioning");
				data->anon_provisioning = 1;
			} else
				data->anon_provisioning = 0;
			data->resuming = 0;
			eap_fast_derive_keys(sm, data);
		}

		if (res == 2) {
			struct wpabuf msg;
			/*
			 * Application data included in the handshake message.
			 */
			wpabuf_free(data->pending_phase2_req);
			data->pending_phase2_req = resp;
			resp = NULL;
			wpabuf_set(&msg, pos, left);
			res = eap_fast_decrypt(sm, data, ret, req, &msg,
					       &resp);
		}
	}

	if (res == 1) {
		wpabuf_free(resp);
		return eap_peer_tls_build_ack(id, EAP_TYPE_FAST,
					      data->fast_version);
	}

	return resp;
}


#if 0 /* FIX */
static Boolean eap_fast_has_reauth_data(struct eap_sm *sm, void *priv)
{
	struct eap_fast_data *data = priv;
	return tls_connection_established(sm->ssl_ctx, data->ssl.conn);
}


static void eap_fast_deinit_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_fast_data *data = priv;
	os_free(data->key_block_p);
	data->key_block_p = NULL;
	wpabuf_free(data->pending_phase2_req);
	data->pending_phase2_req = NULL;
}


static void * eap_fast_init_for_reauth(struct eap_sm *sm, void *priv)
{
	struct eap_fast_data *data = priv;
	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_success = 0;
	data->resuming = 1;
	data->provisioning = 0;
	data->anon_provisioning = 0;
	data->simck_idx = 0;
	return priv;
}
#endif


static int eap_fast_get_status(struct eap_sm *sm, void *priv, char *buf,
			       size_t buflen, int verbose)
{
	struct eap_fast_data *data = priv;
	int len, ret;

	len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
	if (data->phase2_method) {
		ret = os_snprintf(buf + len, buflen - len,
				  "EAP-FAST Phase2 method=%s\n",
				  data->phase2_method->name);
		if (ret < 0 || (size_t) ret >= buflen - len)
			return len;
		len += ret;
	}
	return len;
}


static Boolean eap_fast_isKeyAvailable(struct eap_sm *sm, void *priv)
{
	struct eap_fast_data *data = priv;
	return data->success;
}


static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
{
	struct eap_fast_data *data = priv;
	u8 *key;

	if (!data->success)
		return NULL;

	key = os_malloc(EAP_FAST_KEY_LEN);
	if (key == NULL)
		return NULL;

	*len = EAP_FAST_KEY_LEN;
	os_memcpy(key, data->key_data, EAP_FAST_KEY_LEN);

	return key;
}


static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
{
	struct eap_fast_data *data = priv;
	u8 *key;

	if (!data->success)
		return NULL;

	key = os_malloc(EAP_EMSK_LEN);
	if (key == NULL)
		return NULL;

	*len = EAP_EMSK_LEN;
	os_memcpy(key, data->emsk, EAP_EMSK_LEN);

	return key;
}


int eap_peer_fast_register(void)
{
	struct eap_method *eap;
	int ret;

	eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
				    EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
	if (eap == NULL)
		return -1;

	eap->init = eap_fast_init;
	eap->deinit = eap_fast_deinit;
	eap->process = eap_fast_process;
	eap->isKeyAvailable = eap_fast_isKeyAvailable;
	eap->getKey = eap_fast_getKey;
	eap->get_status = eap_fast_get_status;
#if 0
	eap->has_reauth_data = eap_fast_has_reauth_data;
	eap->deinit_for_reauth = eap_fast_deinit_for_reauth;
	eap->init_for_reauth = eap_fast_init_for_reauth;
#endif
	eap->get_emsk = eap_fast_get_emsk;

	ret = eap_peer_method_register(eap);
	if (ret)
		eap_peer_method_free(eap);
	return ret;
}