eap_ttls.c

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	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;
}


#if EAP_TTLS_VERSION > 0
static struct wpabuf * eap_ttls_build_phase_finished(
	struct eap_sm *sm, struct eap_ttls_data *data, int id, int final)
{
	int len;
	struct wpabuf *req;
	u8 *pos;
	const int max_len = 300;

	req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TTLS, 1 + max_len,
			    EAP_CODE_RESPONSE, id);
	if (req == NULL)
		return NULL;

	wpabuf_put_u8(req, data->ttls_version);

	pos = wpabuf_put(req, 0);
	len = tls_connection_ia_send_phase_finished(sm->ssl_ctx,
						    data->ssl.conn,
						    final, pos, max_len);
	if (len < 0) {
		wpabuf_free(req);
		return NULL;
	}
	wpabuf_put(req, len);
	eap_update_len(req);

	return req;
}
#endif /* EAP_TTLS_VERSION */


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");
		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)
{
	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");
	if (data->ttls_version > 0) {
		/*
		 * EAP-TTLSv1 uses TLS/IA FinalPhaseFinished to report
		 * success, so do not allow connection to be terminated
		 * yet.
		 */
		ret->methodState = METHOD_CONT;
		ret->decision = DECISION_COND_SUCC;
	} else {
		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;
}


#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);
	}