"use strict";
/**
* @module opcua.server
*/
var _ = require("underscore");
var assert = require("node-opcua-assert");
var util = require("util");
var EventEmitter = require("events").EventEmitter;
var crypto_utils = require("node-opcua-crypto").crypto_utils;
var MessageBuilder = require("../message_builder").MessageBuilder;
var MessageChunker = require("../message_chunker").MessageChunker;
var securityPolicy_m =require("../security_policy");
var SecurityPolicy = securityPolicy_m.SecurityPolicy;
var ServerTCP_transport = require("node-opcua-transport").ServerTCP_transport;
var StatusCode = require("node-opcua-status-code").StatusCode;
var StatusCodes = require("node-opcua-status-code").StatusCodes;
var secure_channel_service = require("../services");
var AsymmetricAlgorithmSecurityHeader = secure_channel_service.AsymmetricAlgorithmSecurityHeader;
var MessageSecurityMode = require("node-opcua-service-secure-channel").MessageSecurityMode;
var ChannelSecurityToken = secure_channel_service.ChannelSecurityToken;
var ServiceFault = secure_channel_service.ServiceFault;
var OpenSecureChannelRequest = secure_channel_service.OpenSecureChannelRequest;
var OpenSecureChannelResponse = secure_channel_service.OpenSecureChannelResponse;
var SecurityTokenRequestType = secure_channel_service.SecurityTokenRequestType;
var split_der = require("node-opcua-crypto").crypto_explore_certificate.split_der;
assert(MessageSecurityMode);
assert(ChannelSecurityToken);
assert(OpenSecureChannelRequest);
assert(OpenSecureChannelResponse);
assert(SecurityTokenRequestType);
assert(ServiceFault);
var do_trace_message = process.env.DEBUG && (process.env.DEBUG.indexOf("TRACE")) >= 0;
var crypto = require("crypto");
var analyze_object_binary_encoding = require("node-opcua-packet-analyzer").analyze_object_binary_encoding;
var debugLog = require("node-opcua-debug").make_debugLog(__filename);
var doDebug = require("node-opcua-debug").checkDebugFlag(__filename);
var last_channel_id = 0;
function getNextChannelId() {
last_channel_id += 1;
return last_channel_id;
}
var get_clock_tick = require("node-opcua-utils").get_clock_tick;
/**
* @class ServerSecureChannelLayer
* @extends EventEmitter
* @uses MessageBuilder
* @uses MessageChunker
* @constructor
* @param options
* @param options.parent {OPCUAServerEndPoint} parent
* @param [options.timeout = 10000] {Number} timeout in milliseconds
* @param [options.defaultSecureTokenLifetime = 30000] defaultSecureTokenLifetime
* @param [options.objectFactory] an factory that provides a method createObjectId(id) for the message builder
*/
function ServerSecureChannelLayer(options) {
options = options || {};
var self = this;
self.parent = options.parent;
self.protocolVersion = 0;
self.lastTokenId = 0;
self.timeout = options.timeout || 10000; // connection timeout
self.defaultSecureTokenLifetime = options.defaultSecureTokenLifetime || 600000;
// uninitialized securityToken
self.securityToken = {secureChannelId: 0, tokenId: 0};
self.serverNonce = null; // will be created when needed
options.objectFactory = options.objectFactory || require("node-opcua-factory");
assert(_.isObject(options.objectFactory));
self.messageBuilder = new MessageBuilder({objectFactory: options.objectFactory});
self.messageBuilder.privateKey = self.getPrivateKey();
//disabled self.messageBuilder.on("chunk", function (chunk) {});
//disabled self.messageBuilder.on("full_message_body", function (full_message_body) { });
self.messageBuilder.on("error", function (err) {
// istanbul ignore next
if (doDebug) {
debugLog("xxxxx error ".red,err.message.yellow,err.stack);
debugLog("xxxxx Server is now closing socket, without further notice".red);
}
// close socket immediately
self.close(undefined);
});
// at first use a anonymous connection
self.securityHeader = new AsymmetricAlgorithmSecurityHeader({
securityPolicyUri: "http://opcfoundation.org/UA/SecurityPolicy#None",
senderCertificate: null,
receiverCertificateThumbprint: null
});
self.messageChunker = new MessageChunker({
securityHeader: self.securityHeader // for OPN
});
self.secureChannelId = getNextChannelId();
self._tick0 = 0;
self.securityMode = MessageSecurityMode.INVALID;
self.timeoutId = 0;
self._transactionsCount = 0;
self.sessionTokens = {};
}
util.inherits(ServerSecureChannelLayer, EventEmitter);
var ObjectRegistry = require("node-opcua-object-registry").ObjectRegistry;
ServerSecureChannelLayer.registry = new ObjectRegistry();
/**
* the endpoint associated with this secure channel
* @property endpoints
* @type {OPCUAServerEndPoint}
*
*/
ServerSecureChannelLayer.prototype.__defineGetter__("endpoints", function () {
return this.parent;
});
ServerSecureChannelLayer.prototype.setSecurity = function (securityMode, securityPolicy) {
var self = this;
// TODO verify that the endpoint really supports this mode
self.messageBuilder.setSecurity(securityMode, securityPolicy);
};
/**
* @method getCertificate
* @return {Buffer} the X509 DER form certificate
*/
ServerSecureChannelLayer.prototype.getCertificateChain = function () {
assert(this.parent, "expecting a valid parent");
return this.parent.getCertificateChain();
};
/**
* @method getCertificate
* @return {Buffer} the X509 DER form certificate
*/
ServerSecureChannelLayer.prototype.getCertificate = function () {
assert(this.parent, "expecting a valid parent");
return this.parent.getCertificate();
};
ServerSecureChannelLayer.prototype.getSignatureLength = function () {
var self = this;
var chain = self.getCertificateChain();
var s = split_der(chain)[0];
var cert = crypto_utils.exploreCertificate(s);
return cert.publicKeyLength; // 1024 bits = 128Bytes or 2048=256Bytes
};
/**
* @method getPrivateKey
* @return {Buffer} the privateKey
*/
ServerSecureChannelLayer.prototype.getPrivateKey = function () {
return this.parent ? this.parent._privateKey : null;
};
ServerSecureChannelLayer.prototype.__defineGetter__("securityTokenCount", function () {
assert(_.isNumber(this.lastTokenId));
return this.lastTokenId;
});
function _stop_security_token_watch_dog() {
/* jshint validthis: true */
var self = this;
if (self._securityTokenTimeout) {
clearTimeout(self._securityTokenTimeout);
self._securityTokenTimeout = null;
}
}
function _start_security_token_watch_dog() {
/* jshint validthis: true */
var self = this;
// install securityToken timeout watchdog
self._securityTokenTimeout = setTimeout(function () {
console.log(" Security token has really expired and shall be discarded !!!!");
console.log(" Server will now refuse message with token ", self.securityToken.tokenId);
self._securityTokenTimeout = null;
}, self.securityToken.revisedLifeTime * 120 / 100);
}
ServerSecureChannelLayer.prototype._add_new_security_token = function () {
// The Server has to accept requests secured with the old SecurityToken until that SecurityToken expires
// or until it receives a Message from the Client secured with the new SecurityToken.
var self = this;
_stop_security_token_watch_dog.call(self);
self.lastTokenId += 1;
var securityToken = new ChannelSecurityToken({
secureChannelId: self.secureChannelId,
tokenId: self.lastTokenId, // todo ?
createdAt: new Date(), // now
revisedLifeTime: self.revisedLifeTime
});
assert(!securityToken.expired);
assert(_.isFinite(securityToken.revisedLifeTime));
self.securityToken = securityToken;
debugLog("SecurityToken", securityToken.tokenId);
_start_security_token_watch_dog.call(self);
};
function _prepare_security_token(openSecureChannelRequest) {
/* jshint validthis: true */
var self = this;
assert(openSecureChannelRequest instanceof OpenSecureChannelRequest);
delete self.securityToken;
if (openSecureChannelRequest.requestType === SecurityTokenRequestType.RENEW) {
_stop_security_token_watch_dog.call(self);
} else if (openSecureChannelRequest.requestType === SecurityTokenRequestType.ISSUE) {
// TODO
} else {
// Invalid requestType
}
self._add_new_security_token();
}
function _set_lifetime(requestedLifetime) {
/* jshint validthis: true */
var self = this;
assert(_.isFinite(requestedLifetime));
// revised lifetime
self.revisedLifeTime = requestedLifetime;
if (self.revisedLifeTime === 0) {
self.revisedLifeTime = self.defaultSecureTokenLifetime;
} else {
self.revisedLifeTime = Math.min(self.defaultSecureTokenLifetime, self.revisedLifeTime);
}
}
function _stop_open_channel_watch_dog() {
/* jshint validthis: true */
var self = this;
if (self.timeoutId) {
clearTimeout(self.timeoutId);
self.timeoutId = null;
}
}
ServerSecureChannelLayer.prototype._cleanup_pending_timers = function () {
var self = this;
// there is no need for the security token expiration event to trigger anymore
_stop_security_token_watch_dog.call(self);
_stop_open_channel_watch_dog.call(self);
};
/**
* @method init
* @async
* @param socket {Socket}
* @param callback {Function}
*/
ServerSecureChannelLayer.prototype.init = function (socket, callback) {
var self = this;
self.transport = new ServerTCP_transport();
self.transport.timeout = self.timeout;
self.transport.init(socket, function (err) {
if (err) {
callback(err);
} else {
// bind low level TCP transport to messageBuilder
self.transport.on("message", function (message_chunk) {
assert(self.messageBuilder);
self.messageBuilder.feed(message_chunk);
});
debugLog("ServerSecureChannelLayer : Transport layer has been initialized ");
debugLog("... now waiting for OpenSecureChannelRequest...");
ServerSecureChannelLayer.registry.register(self);
_wait_for_open_secure_channel_request.call(self, callback, self.timeout);
}
});
// detect transport closure
self._transport_socket_close_listener = function(err) {
self._abort();
};
self.transport.on("socket_closed",self._transport_socket_close_listener);
};
ServerSecureChannelLayer.prototype._rememberClientAddressAndPort = function() {
if (this.transport._socket) {
this._remoteAddress = this.transport._socket.remoteAddress;
this._remotePort = this.transport._socket.remotePort;
}
};
ServerSecureChannelLayer.prototype.__defineGetter__("remoteAddress",function() {
return this._remoteAddress;
});
ServerSecureChannelLayer.prototype.__defineGetter__("remotePort",function() {
return this._remotePort;
});
function _cancel_wait_for_open_secure_channel_request_timeout() {
/* jshint validthis: true */
var self = this;
assert(self);
_stop_open_channel_watch_dog.call(self);
//xx assert(self.timeoutId);
//xx // suspend timeout handler
//xx clearTimeout(self.timeoutId);
//xx self.timeoutId = null;
}
function _install_wait_for_open_secure_channel_request_timeout(callback, timeout) {
/* jshint validthis: true */
var self = this;
assert(_.isFinite(timeout));
assert(_.isFunction(callback));
assert(self);
self.timeoutId = setTimeout(function () {
self.timeoutId = null;
var err = new Error("Timeout waiting for OpenChannelRequest (timeout was " + timeout + " ms)");
debugLog(err.message);
self.close(function () {
callback(err);
});
}, timeout);
}
function _on_initial_open_secure_channel_request(callback, request, msgType, requestId, secureChannelId) {
/* istanbul ignore next */
if (do_trace_message) {
dump_request(request,requestId,secureChannelId);
}
assert(_.isFunction(callback));
/* jshint validthis: true */
var self = this;
assert(self);
// check that the request is a OpenSecureChannelRequest
/* istanbul ignore next */
if (doDebug) {
debugLog(self.messageBuilder.sequenceHeader.toString());
debugLog(self.messageBuilder.securityHeader.toString());
//xx analyze_object_binary_encoding(request);
}
_cancel_wait_for_open_secure_channel_request_timeout.call(self);
requestId = self.messageBuilder.sequenceHeader.requestId;
assert(requestId > 0);
var message = {
request: request,
securityHeader: self.messageBuilder.securityHeader,
requestId: requestId
};
assert(message.requestId === requestId);
self.clientSecurityHeader = message.securityHeader;
_on_initial_OpenSecureChannelRequest.call(self, message, callback);
}
function _wait_for_open_secure_channel_request(callback, timeout) {
/* jshint validthis: true */
var self = this;
_install_wait_for_open_secure_channel_request_timeout.call(self, callback, timeout);
self.messageBuilder.once("message", _on_initial_open_secure_channel_request.bind(self, callback));
}
function _send_chunk(callback, messageChunk) {
/* jshint validthis: true */
var self = this;
if (messageChunk) {
self.transport.write(messageChunk);
} else {
// record tick 3 : transaction completed.
self._tick3 = get_clock_tick();
if (callback) {
setImmediate(callback);
}
self._record_transaction_statistics();
/* istanbul ignore next */
if (doDebug) {
// dump some statistics about transaction ( time and sizes )
self._dump_transaction_statistics();
}
self.emit("transaction_done");
}
}
ServerSecureChannelLayer.prototype._get_security_options_for_OPN = function () {
var self = this;
var cryptoFactory = self.messageBuilder.cryptoFactory;
var options = {};
// install sign & sign-encrypt behavior
if (self.securityMode === MessageSecurityMode.SIGN || self.securityMode === MessageSecurityMode.SIGNANDENCRYPT) {
assert(cryptoFactory, "ServerSecureChannelLayer must have a crypto strategy");
options.signatureLength = self.getSignatureLength();
options.signingFunc = function (chunk) {
var signed = cryptoFactory.asymmetricSign(chunk, self.getPrivateKey());
assert(signed.length === options.signatureLength);
return signed;
};
assert(self.receiverPublicKeyLength >= 0);
options.plainBlockSize = self.receiverPublicKeyLength - cryptoFactory.blockPaddingSize;
options.cipherBlockSize = self.receiverPublicKeyLength;
options.encrypt_buffer = function (chunk) {
return cryptoFactory.asymmetricEncrypt(chunk, self.receiverPublicKey);
};
}
return options;
};
ServerSecureChannelLayer.prototype._get_security_options_for_MSG = function () {
var self = this;
if (self.securityMode === MessageSecurityMode.NONE) {
return null;
}
var cryptoFactory = self.messageBuilder.cryptoFactory;
/* istanbul ignore next */
if (!cryptoFactory) {
return null;
}
assert(cryptoFactory, "ServerSecureChannelLayer must have a crypto strategy");
assert(self.derivedKeys.derivedServerKeys);
var derivedServerKeys = self.derivedKeys.derivedServerKeys;
return securityPolicy_m.getOptionsForSymmetricSignAndEncrypt(self.securityMode, derivedServerKeys);
};
/**
* @method send_response
* @async
* @param msgType
* @param response
* @param message
* @param {Function} [callback] an optional callback function
*/
ServerSecureChannelLayer.prototype.send_response = function (msgType, response, message, callback) {
var request = message.request;
var requestId = message.requestId;
var self = this;
// istanbul ignore next
if (doDebug) {
assert(response._schema);
assert(request._schema);
assert(requestId && requestId > 0);
// verify that response for a given requestId is only sent once.
if (!self.__verifId) {
self.__verifId = {};
}
assert(!self.__verifId[requestId]," response for requestId has already been sent !! - Internal Error");
self.__verifId[requestId] = requestId;
}
self.msgType = msgType;
// record tick : send response received.
self._tick2 = get_clock_tick();
assert(self.securityToken);
var options = {
requestId: requestId,
secureChannelId: self.securityToken.secureChannelId,
tokenId: self.securityToken.tokenId,
chunkSize: self.transport.receiveBufferSize
};
var security_options = (msgType === "OPN") ? self._get_security_options_for_OPN() : self._get_security_options_for_MSG();
options = _.extend(options, security_options);
//xx assert(_.isFinite(request.requestHeader.requestHandle));
response.responseHeader.requestHandle = request.requestHeader.requestHandle;
/* istanbul ignore next */
if (0 && doDebug) {
console.log(" options ", options);
analyze_object_binary_encoding(response);
}
//xx console.log(" sending request ".bgWhite.red,requestId,message.request.constructor.name);
/* istanbul ignore next */
if (do_trace_message) {
console.log("xxxx >>>> ---------------------------------------- ".cyan.bold, response._schema.name.green.bold,requestId);
console.log(response.toString());
console.log("xxxx >>>> ----------------------------------------|\n".cyan.bold);
}
if (self._on_response) {
self._on_response(msgType, response, message);
}
self._transactionsCount += 1;
self.messageChunker.chunkSecureMessage(msgType, options, response, _send_chunk.bind(self, callback));
};
/**
*
* send a ServiceFault response
* @method send_error_and_abort
* @async
* @param statusCode {StatusCode} the status code
* @param description {String}
* @param message {String}
* @param callback {Function}
*/
ServerSecureChannelLayer.prototype.send_error_and_abort = function (statusCode, description, message, callback) {
var self = this;
assert(statusCode instanceof StatusCode);
assert(message.request._schema);
assert(message.requestId && message.requestId > 0);
assert(_.isFunction(callback));
var response = new ServiceFault({
responseHeader: {serviceResult: statusCode}
});
response.description = description;
self.send_response("MSG", response, message, function () {
self.close(callback);
});
};
/**
* _process_certificates extracts client public keys from client certificate
* and store them in self.receiverPublicKey and self.receiverCertificate
* it also caches self.receiverPublicKeyLength.
*
* so they can be used by security channel.
*
* @method _process_certificates
* @param message the message coming from the client
* @param callback
* @private
* @async
*/
ServerSecureChannelLayer.prototype._process_certificates = function (message, callback) {
var self = this;
self.receiverPublicKey = null;
self.receiverPublicKeyLength = 0;
self.receiverCertificate = message.securityHeader ? message.securityHeader.senderCertificate : null;
// ignore receiverCertificate that have a zero length
/* istanbul ignore next */
if (self.receiverCertificate && self.receiverCertificate.length === 0) {
self.receiverCertificate = null;
}
if (self.receiverCertificate) {
// extract public key
crypto_utils.extractPublicKeyFromCertificate(self.receiverCertificate, function (err, key) {
if (!err) {
self.receiverPublicKey = key;
self.receiverPublicKeyLength = crypto_utils.rsa_length(key);
}
callback(err);
});
} else {
self.receiverPublicKey = null;
callback();
}
};
/**
* @method _prepare_security_header
* @param request
* @param message
* @return {AsymmetricAlgorithmSecurityHeader}
* @private
*/
function _prepare_security_header(request, message) {
/* jshint validthis: true */
var self = this;
var securityHeader = null;
// senderCertificate:
// The X509v3 certificate assigned to the sending application instance.
// This is a DER encoded blob.
// This indicates what private key was used to sign the MessageChunk.
// This field shall be null if the message is not signed.
// receiverCertificateThumbprint:
// The thumbprint of the X509v3 certificate assigned to the receiving application
// The thumbprint is the SHA1 digest of the DER encoded form of the certificate.
// This indicates what public key was used to encrypt the MessageChunk
// This field shall be null if the message is not encrypted.
switch (request.securityMode.value) {
case MessageSecurityMode.NONE.value:
assert(!message.securityHeader || message.securityHeader.securityPolicyUri === "http://opcfoundation.org/UA/SecurityPolicy#None");
securityHeader = new AsymmetricAlgorithmSecurityHeader({
securityPolicyUri: "http://opcfoundation.org/UA/SecurityPolicy#None",
senderCertificate: null, // message not signed
receiverCertificateThumbprint: null // message not encrypted
});
break;
case MessageSecurityMode.SIGN.value:
case MessageSecurityMode.SIGNANDENCRYPT.value:
// get the thumbprint of the client certificate
var thumbprint = self.receiverCertificate ? crypto_utils.makeSHA1Thumbprint(self.receiverCertificate) : null;
securityHeader = new AsymmetricAlgorithmSecurityHeader({
securityPolicyUri: self.clientSecurityHeader.securityPolicyUri,
senderCertificate: self.getCertificateChain(), // certificate of the private key used to sign the message
receiverCertificateThumbprint: thumbprint // message not encrypted (????)
});
break;
}
return securityHeader;
}
function _handle_OpenSecureChannelRequest(message, callback) {
/* jshint validthis: true */
var self = this;
var request = message.request;
var requestId = message.requestId;
assert(request._schema.name === "OpenSecureChannelRequest");
assert(requestId && requestId > 0);
self.clientNonce = request.clientNonce;
_set_lifetime.call(self, request.requestedLifetime);
_prepare_security_token.call(self, request);
var serviceResult = StatusCodes.Good;
var cryptoFactory = self.messageBuilder.cryptoFactory;
if (cryptoFactory) {
// serverNonce: A random number that shall not be used in any other request. A new
// serverNonce shall be generated for each time a SecureChannel is renewed.
// This parameter shall have a length equal to key size used for the symmetric
// encryption algorithm that is identified by the securityPolicyUri.
self.serverNonce = crypto.randomBytes(cryptoFactory.symmetricKeyLength);
if (self.clientNonce.length !== self.serverNonce.length) {
console.log("warning client Nonce length doesn't match server nonce length".red,self.clientNonce.length ," !== ",self.serverNonce.length);
// what can we do
// - just ignore it ?
// - or adapt serverNonce length to clientNonce Length ?
//xx self.serverNonce = crypto.randomBytes(self.clientNonce.length);
// - or adapt clientNonce length to serverNonce Length ?
//xx self.clientNonce = self.clientNonce.slice(0,self.serverNonce.length);
//
// - or abort connection ? << LET BE SAFE AND CHOOSE THIS ONE !
serviceResult = StatusCodes.BadSecurityModeRejected; // ToDo check code
}
// expose derivedKey to use for symmetric sign&encrypt
// to help us decrypting and verifying messages received from client
self.derivedKeys = cryptoFactory.compute_derived_keys(this.serverNonce, this.clientNonce);
}
var derivedClientKeys = this.derivedKeys ? this.derivedKeys.derivedClientKeys : null;
this.messageBuilder.pushNewToken(this.securityToken, derivedClientKeys);
// let prepare self.securityHeader;
self.securityHeader = _prepare_security_header.call(self, request, message);
assert(self.securityHeader);
var derivedServerKeys = self.derivedKeys ? self.derivedKeys.derivedServerKeys : null;
self.messageChunker.update({
// for OPN
securityHeader: self.securityHeader,
// derived keys for symmetric encryption of standard MSG
// to sign and encrypt MSG sent to client
derivedKeys: derivedServerKeys
});
var response = new OpenSecureChannelResponse({
responseHeader: {
serviceResult: serviceResult
},
serverProtocolVersion: self.protocolVersion,
securityToken: self.securityToken,
serverNonce: self.serverNonce
});
// get the clientCertificate from message securityHeader
// for convenience
self.clientCertificate = message.securityHeader ? message.securityHeader.senderCertificate : null;
var description;
// If the SecurityMode is not None then the Server shall verify that a SenderCertificate and a
// ReceiverCertificateThumbprint were specified in the SecurityHeader.
if (self.securityMode.value !== MessageSecurityMode.NONE.value) {
if (!_check_receiverCertificateThumbprint.call(self, self.clientSecurityHeader)) {
description = "Server#OpenSecureChannelRequest : Invalid receiver certificate thumbprint : the thumbprint doesn't match server certificate !";
console.log(description.cyan);
response.responseHeader.serviceResult = StatusCodes.BadCertificateInvalid;
}
}
if (self.clientCertificate) {
var certificate_status = _check_certificate_validity(self.clientCertificate);
if (StatusCodes.Good !== certificate_status) {
description = "Sender Certificate Error";
console.log(description.cyan, certificate_status.toString().bgRed.yellow);
// OPCUA specification v1.02 part 6 page 42 $6.7.4
// If an error occurs after the Server has verified Message security it shall return a ServiceFault instead
// of a OpenSecureChannel response. The ServiceFault Message is described in Part 4, 7.28.
response = new ServiceFault({responseHeader: {serviceResult: certificate_status}});
}
}
self.send_response("OPN", response, message, function (/*err*/) {
if (response.responseHeader.serviceResult !== StatusCodes.Good) {
self.close();
}
callback(null);
});
}
ServerSecureChannelLayer.prototype._abort = function () {
var self = this;
if (self._abort_has_been_called) {
return;
}
ServerSecureChannelLayer.registry.unregister(self);
self._abort_has_been_called = true;
self._cleanup_pending_timers();
/**
* notify the observers that the SecureChannel has aborted.
* the reason could be :
* - a CloseSecureChannelRequest has been received.
* - a invalid message has been received
* the event is sent after the underlying transport layer has been closed.
*
* @event abort
*/
self.emit("abort");
};
/**
* Abruptly close a Server SecureChannel ,by terminating the underlying transport.
*
*
* @method close
* @async
* @param callback {Function}
*/
ServerSecureChannelLayer.prototype.close = function (callback) {
var self = this;
debugLog("ServerSecureChannelLayer#close");
// close socket
self.transport.disconnect(function () {
self._abort();
if (_.isFunction(callback)) {
callback();
}
});
};
ServerSecureChannelLayer.prototype._record_transaction_statistics = function () {
var self = this;
self._bytesRead_before = self._bytesRead_before || 0;
self._byesWritten_before = self._byesWritten_before || 0;
self.last_transaction_stats = {
bytesRead: self.bytesRead - self._bytesRead_before,
bytesWritten: self.bytesWritten - self._bytesWritten_before,
lap_reception: self._tick1 - self._tick0,
lap_processing: self._tick2 - self._tick1,
lap_emission: self._tick3 - self._tick2,
//last_transaction_time: Date.now()
};
// final operation in statistics
self._bytesRead_before = self.bytesRead;
self._bytesWritten_before = self.bytesWritten;
};
ServerSecureChannelLayer.prototype._dump_transaction_statistics = function () {
var self = this;
console.log(" Bytes Read : ", self.last_transaction_stats.bytesRead);
console.log(" Bytes Written : ", self.last_transaction_stats.bytesWritten);
console.log(" time to receive request : ", self.last_transaction_stats.lap_reception / 1000, " sec");
console.log(" time to process request : ", self.last_transaction_stats.lap_processing / 1000, " sec");
console.log(" time to send response : ", self.last_transaction_stats.lap_emission / 1000, " sec");
};
ServerSecureChannelLayer.prototype.has_endpoint_for_security_mode_and_policy = function (securityMode, securityPolicy) {
var self = this;
if (!self.endpoints) {
return true;
}
var endpoint_desc = self.endpoints.getEndpointDescription(securityMode, securityPolicy);
return (endpoint_desc !== null);
};
// istanbul ignore next
function dump_request(request,requestId,secureChannelId) {
console.log("xxxx <<<< ---------------------------------------- ".cyan, request._schema.name.yellow, "requestId", requestId, "secureChannelId=", secureChannelId);
console.log(request.toString());
console.log("xxxx <<<< ---------------------------------------- \n".cyan);
}
var _on_common_message = function (request, msgType, requestId, secureChannelId) {
var self = this;
/* istanbul ignore next */
if (do_trace_message) {
dump_request(request,requestId,secureChannelId);
}
requestId = self.messageBuilder.sequenceHeader.requestId;
var message = {
request: request,
requestId: requestId,
channel: self
};
if (msgType === "CLO" && request._schema.name === "CloseSecureChannelRequest") {
self.close();
} else if (msgType === "OPN" && request._schema.name === "OpenSecureChannelRequest") {
// intercept client request to renew security Token
_handle_OpenSecureChannelRequest.call(self, message, function () {
});
} else {
if (request._schema.name === "CloseSecureChannelRequest") {
console.log("WARNING : RECEIVED a CloseSecureChannelRequest with MSGTYPE=" + msgType);
self.close();
} else {
// record tick 1 : after message has been received, before message processing
self._tick1 = get_clock_tick();
/**
* notify the observer that a OPCUA message has been received.
* It is up to one observer to call send_response or send_error_and_abort to complete
* the transaction.
*
* @event message
* @param message
*/
self.emit("message", message);
}
}
};
/**
* @method _check_receiverCertificateThumbprint
* verify that the receiverCertificateThumbprint send by the client
* matching the CertificateThumbPrint of the server
* @param clientSecurityHeader
* @return {boolean}
* @private
*/
function _check_receiverCertificateThumbprint(clientSecurityHeader) {
/* jshint validthis: true */
var self = this;
if (clientSecurityHeader.receiverCertificateThumbprint) {
// check if the receiverCertificateThumbprint is my certificate thumbprint
var serverCertificateChain = self.getCertificateChain();
//xx var serverCertificate = split_der(serverCertificateChain)[0];
var myCertificateThumbPrint = crypto_utils.makeSHA1Thumbprint(serverCertificateChain);
//xx console.log("xxxx my certificate thumbprint",myCertificateThumbPrint.toString("hex") );
//xx console.log("xxxx receiverCertificateThumbprint",securityHeader.receiverCertificateThumbprint.toString("hex") );
return myCertificateThumbPrint.toString("hex") === clientSecurityHeader.receiverCertificateThumbprint.toString("hex");
}
return true;
}
// Bad_CertificateHostNameInvalid The HostName used to connect to a Server does not match a HostName in the
// Certificate.
// Bad_CertificateIssuerRevocationUnknown It was not possible to determine if the Issuer Certificate has been revoked.
// Bad_CertificateIssuerUseNotAllowed The Issuer Certificate may not be used for the requested operation.
// Bad_CertificateIssuerTimeInvalid An Issuer Certificate has expired or is not yet valid.
// Bad_CertificateIssuerRevoked The Issuer Certificate has been revoked.
// Bad_CertificateInvalid The certificate provided as a parameter is not valid.
// Bad_CertificateRevocationUnknown It was not possible to determine if the Certificate has been revoked.
// Bad_CertificateRevoked The Certificate has been revoked.
// Bad_CertificateTimeInvalid The Certificate has expired or is not yet valid.
// Bad_CertificateUriInvalid The URI specified in the ApplicationDescription does not match the URI in the Certificate.
// Bad_CertificateUntrusted The Certificate is not trusted.
// Bad_CertificateUseNotAllowed The Certificate may not be used for the requested operation.
// also see OPCUA 1.02 part 4 :
// - page 95 6.1.3 Determining if a Certificate is Trusted
// - page 100 6.2.3 Validating a Software Certificate
//
function _check_certificate_validity(certificate) {
// Is the signature on the SoftwareCertificate valid .?
if (!certificate) {
// missing certificate
return StatusCodes.BadSecurityChecksFailed;
}
//-- var split_der = require("node-opcua-crypto").crypto_explore_certificate.split_der;
//-- var chain = split_der(securityHeader.senderCertificate);
//-- //xx console.log("xxx NB CERTIFICATE IN CHAIN = ".red,chain.length);
// Has SoftwareCertificate passed its issue date and has it not expired ?
// check dates
var cert = crypto_utils.exploreCertificate(certificate);
var now = new Date();
if (cert.notBefore.getTime() > now.getTime()) {
// certificate is not active yet
console.log(" Sender certificate is invalid : certificate is not active yet !".red + " not before date =" + cert.notBefore);
return StatusCodes.BadCertificateTimeInvalid;
}
if (cert.notAfter.getTime() <= now.getTime()) {
// certificate is obsolete
console.log(" Sender certificate is invalid : certificate has expired !".red + " not after date =" + cert.notAfter);
return StatusCodes.BadCertificateTimeInvalid;
}
// Has SoftwareCertificate has been revoked by the issuer ?
// TODO: check if certificate is revoked or not ...
// StatusCodes.BadCertificateRevoked
// is issuer Certificate valid and has not been revoked by the CA that issued it. ?
// TODO : check validity of issuer certificate
// StatusCodes.BadCertificateIssuerRevoked
//does the URI specified in the ApplicationDescription match the URI in the Certificate ?
// TODO : check ApplicationDescription of issuer certificate
// return StatusCodes.BadCertificateUriInvalid
return StatusCodes.Good;
}
// Bad_RequestTypeInvalid The security token request type is not valid.
// Bad_SecurityModeRejected The security mode does not meet the requirements set by the Server.
// Bad_SecurityPolicyRejected The security policy does not meet the requirements set by the Server.
// Bad_SecureChannelIdInvalid
// Bad_NonceInvalid
function isValidSecurityPolicy(securityPolicy) {
switch (securityPolicy.value) {
case SecurityPolicy.None.value:
case SecurityPolicy.Basic128Rsa15.value:
case SecurityPolicy.Basic256.value:
case SecurityPolicy.Basic256Sha256.value:
return StatusCodes.Good;
default:
return StatusCodes.BadSecurityPolicyRejected;
}
}
function _send_error(statusCode, description, message, callback) {
/* jshint validthis: true */
var self = this;
// turn of security mode as we haven't manage to set it to
self.securityMode = MessageSecurityMode.NONE;
// unexpected message type ! let close the channel
var err = new Error(description);
self.send_error_and_abort(statusCode, description, message, function () {
callback(err); // OK
});
}
function _on_initial_OpenSecureChannelRequest(message, callback) {
assert(_.isFunction(callback));
/* jshint validthis: true */
var self = this;
var request = message.request;
var requestId = message.requestId;
assert(requestId > 0);
assert(_.isFinite(request.requestHeader.requestHandle));
var description;
// expecting a OpenChannelRequest as first communication message
if (!(request instanceof OpenSecureChannelRequest)) {
description = "Expecting OpenSecureChannelRequest";
console.log("ERROR".red, "BadCommunicationError: expecting a OpenChannelRequest as first communication message");
return _send_error.call(this, StatusCodes.BadCommunicationError, description, message, callback);
}
var securityPolicy = securityPolicy_m.fromURI(message.securityHeader.securityPolicyUri);
// check security header
var check_security_policy = isValidSecurityPolicy(securityPolicy);
if (check_security_policy !== StatusCodes.Good) {
description = " Unsupported securityPolicyUri " + self.messageBuilder.securityHeader.securityPolicyUri;
return _send_error.call(this, check_security_policy, description, message, callback);
}
assert(request.securityMode);
self.securityMode = request.securityMode;
self.messageBuilder.securityMode = self.securityMode;
var has_endpoint = self.has_endpoint_for_security_mode_and_policy(self.securityMode, securityPolicy);
if (!has_endpoint) {
// there is no
description = " This server doesn't not support " + securityPolicy.toString() + " " + self.securityMode.toString();
return _send_error.call(self, StatusCodes.BadSecurityPolicyRejected, description, message, callback);
}
self.endpoint = self.endpoints && self.endpoints.getEndpointDescription(self.securityMode, securityPolicy);
self.messageBuilder
.on("message", _on_common_message.bind(self))
.on("start_chunk", function () {
//record tick 0: when the first chunk is received
self._tick0 = get_clock_tick();
});
// handle initial OpenSecureChannelRequest
self._process_certificates(message, function () {
_handle_OpenSecureChannelRequest.call(self, message, callback);
});
}
/**
* the number of bytes read so far by this channel
* @property bytesRead
* @type {Number}
*/
ServerSecureChannelLayer.prototype.__defineGetter__("bytesRead", function () {
var self = this;
return self.transport ? self.transport.bytesRead : 0;
});
/**
* the number of bytes written so far by this channel
* @property bytesWritten
* @type {Number}
*/
ServerSecureChannelLayer.prototype.__defineGetter__("bytesWritten", function () {
var self = this;
return self.transport ? self.transport.bytesWritten : 0;
});
ServerSecureChannelLayer.prototype.__defineGetter__("transactionsCount", function () {
var self = this;
return self._transactionsCount;
});
/**
* true when the secure channel has been opened successfully
* @property isOpened
* @type {Boolean}
*
*/
ServerSecureChannelLayer.prototype.__defineGetter__("isOpened",function() {
var self = this;
return self.clientCertificate;
});
/**
* true when the secure channel is assigned to a active session
* @property hasSession
* @type {Boolean}
*/
ServerSecureChannelLayer.prototype.__defineGetter__("hasSession",function() {
var self = this;
return Object.keys(self.sessionTokens).length>0;
});
/**
* The unique hash key to identify this secure channel
* @property hashKey
* @type {String}
*/
ServerSecureChannelLayer.prototype.__defineGetter__("hashKey",function() {
var self = this;
return self.securityToken.secureChannelId.toString();
});
exports.ServerSecureChannelLayer = ServerSecureChannelLayer;
The NodeOPCUA API