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/**
* Socket wrapping functions for TLS.
*
* @author Dave Longley
*
* Copyright (c) 2009-2012 Digital Bazaar, Inc.
*/
var forge = require('./forge');
require('./tls');
/**
* Wraps a forge.net socket with a TLS layer.
*
* @param options:
* sessionId: a session ID to reuse, null for a new connection if no session
* cache is provided or it is empty.
* caStore: an array of certificates to trust.
* sessionCache: a session cache to use.
* cipherSuites: an optional array of cipher suites to use, see
* tls.CipherSuites.
* socket: the socket to wrap.
* virtualHost: the virtual server name to use in a TLS SNI extension.
* verify: a handler used to custom verify certificates in the chain.
* getCertificate: an optional callback used to get a certificate.
* getPrivateKey: an optional callback used to get a private key.
* getSignature: an optional callback used to get a signature.
* deflate: function(inBytes) if provided, will deflate TLS records using
* the deflate algorithm if the server supports it.
* inflate: function(inBytes) if provided, will inflate TLS records using
* the deflate algorithm if the server supports it.
*
* @return the TLS-wrapped socket.
*/
forge.tls.wrapSocket = function(options) {
// get raw socket
var socket = options.socket;
// create TLS socket
var tlsSocket = {
id: socket.id,
// set handlers
connected: socket.connected || function(e) {},
closed: socket.closed || function(e) {},
data: socket.data || function(e) {},
error: socket.error || function(e) {}
};
// create TLS connection
var c = forge.tls.createConnection({
server: false,
sessionId: options.sessionId || null,
caStore: options.caStore || [],
sessionCache: options.sessionCache || null,
cipherSuites: options.cipherSuites || null,
virtualHost: options.virtualHost,
verify: options.verify,
getCertificate: options.getCertificate,
getPrivateKey: options.getPrivateKey,
getSignature: options.getSignature,
deflate: options.deflate,
inflate: options.inflate,
connected: function(c) {
// first handshake complete, call handler
if(c.handshakes === 1) {
tlsSocket.connected({
id: socket.id,
type: 'connect',
bytesAvailable: c.data.length()
});
}
},
tlsDataReady: function(c) {
// send TLS data over socket
return socket.send(c.tlsData.getBytes());
},
dataReady: function(c) {
// indicate application data is ready
tlsSocket.data({
id: socket.id,
type: 'socketData',
bytesAvailable: c.data.length()
});
},
closed: function(c) {
// close socket
socket.close();
},
error: function(c, e) {
// send error, close socket
tlsSocket.error({
id: socket.id,
type: 'tlsError',
message: e.message,
bytesAvailable: 0,
error: e
});
socket.close();
}
});
// handle doing handshake after connecting
socket.connected = function(e) {
c.handshake(options.sessionId);
};
// handle closing TLS connection
socket.closed = function(e) {
if(c.open && c.handshaking) {
// error
tlsSocket.error({
id: socket.id,
type: 'ioError',
message: 'Connection closed during handshake.',
bytesAvailable: 0
});
}
c.close();
// call socket handler
tlsSocket.closed({
id: socket.id,
type: 'close',
bytesAvailable: 0
});
};
// handle error on socket
socket.error = function(e) {
// error
tlsSocket.error({
id: socket.id,
type: e.type,
message: e.message,
bytesAvailable: 0
});
c.close();
};
// handle receiving raw TLS data from socket
var _requiredBytes = 0;
socket.data = function(e) {
// drop data if connection not open
if(!c.open) {
socket.receive(e.bytesAvailable);
} else {
// only receive if there are enough bytes available to
// process a record
if(e.bytesAvailable >= _requiredBytes) {
var count = Math.max(e.bytesAvailable, _requiredBytes);
var data = socket.receive(count);
if(data !== null) {
_requiredBytes = c.process(data);
}
}
}
};
/**
* Destroys this socket.
*/
tlsSocket.destroy = function() {
socket.destroy();
};
/**
* Sets this socket's TLS session cache. This should be called before
* the socket is connected or after it is closed.
*
* The cache is an object mapping session IDs to internal opaque state.
* An application might need to change the cache used by a particular
* tlsSocket between connections if it accesses multiple TLS hosts.
*
* @param cache the session cache to use.
*/
tlsSocket.setSessionCache = function(cache) {
c.sessionCache = tls.createSessionCache(cache);
};
/**
* Connects this socket.
*
* @param options:
* host: the host to connect to.
* port: the port to connect to.
* policyPort: the policy port to use (if non-default), 0 to
* use the flash default.
* policyUrl: the policy file URL to use (instead of port).
*/
tlsSocket.connect = function(options) {
socket.connect(options);
};
/**
* Closes this socket.
*/
tlsSocket.close = function() {
c.close();
};
/**
* Determines if the socket is connected or not.
*
* @return true if connected, false if not.
*/
tlsSocket.isConnected = function() {
return c.isConnected && socket.isConnected();
};
/**
* Writes bytes to this socket.
*
* @param bytes the bytes (as a string) to write.
*
* @return true on success, false on failure.
*/
tlsSocket.send = function(bytes) {
return c.prepare(bytes);
};
/**
* Reads bytes from this socket (non-blocking). Fewer than the number of
* bytes requested may be read if enough bytes are not available.
*
* This method should be called from the data handler if there are enough
* bytes available. To see how many bytes are available, check the
* 'bytesAvailable' property on the event in the data handler or call the
* bytesAvailable() function on the socket. If the browser is msie, then the
* bytesAvailable() function should be used to avoid race conditions.
* Otherwise, using the property on the data handler's event may be quicker.
*
* @param count the maximum number of bytes to read.
*
* @return the bytes read (as a string) or null on error.
*/
tlsSocket.receive = function(count) {
return c.data.getBytes(count);
};
/**
* Gets the number of bytes available for receiving on the socket.
*
* @return the number of bytes available for receiving.
*/
tlsSocket.bytesAvailable = function() {
return c.data.length();
};
return tlsSocket;
};