private void extractBase64EncodedEmailAndPassword(string base64, Frame frame, NetworkTcpSession session)
{
NetworkCredential cred = SmtpPacketHandler.ExtractBase64EncodedAuthPlainCredential(base64, frame, session, ApplicationLayerProtocol.Pop3);
if (cred != null)
{
//this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
this.MainPacketHandler.AddCredential(cred);
this.updateCredential(cred, session);
return;
}
/*
* //dGVzdAB0ZXN0AHRlc3RwYXNz => user = test, password = password
* byte[] bytes = System.Convert.FromBase64String(base64);
* if (bytes.Length > 3 && Array.IndexOf<byte>(bytes, 0, 2) > 0) {
* int firstNullIndex = Array.IndexOf<byte>(bytes, 0);
* int secondNullIndex = Array.IndexOf<byte>(bytes, 0, firstNullIndex+1);
* if (firstNullIndex >= 0 && secondNullIndex > 0) {
* string username = ASCIIEncoding.ASCII.GetString(bytes, firstNullIndex + 1, secondNullIndex - firstNullIndex - 1);
* string password = ASCIIEncoding.ASCII.GetString(bytes, secondNullIndex + 1, bytes.Length - secondNullIndex - 1);
* NetworkCredential cred = new NetworkCredential(session.ClientHost, session.ServerHost, "POP3", username, password, frame.Timestamp);
* this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
* this.updateCredential(cred, session);
* return;
* }
* }
*/
/*
* //the following code is probably not needed since we should already have found the credential by now
* string emailAndPassword = System.Text.ASCIIEncoding.ASCII.GetString(bytes);
* //TODO figure out how to split the email and password!
* bool credentialFound = false;
* if (!credentialFound) {
* foreach (string hostname in this.getDomainsAndParentDomains(session.ServerHost.HostNameList)) {
* if (hostname.Length > 0 && hostname.Contains(".") && emailAndPassword.ToLower().Contains(hostname.ToLower())) {
* int passwordIndex = emailAndPassword.IndexOf(hostname, StringComparison.InvariantCultureIgnoreCase) + hostname.Length;
* NetworkCredential cred = new NetworkCredential(session.ClientHost, session.ServerHost, "POP3", emailAndPassword.Substring(0, passwordIndex), emailAndPassword.Substring(passwordIndex), frame.Timestamp);
* this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
* credentialFound = true;
* this.updateCredential(cred, session);
* }
* }
* }
* if(!credentialFound && emailAndPassword.Contains(".") && emailAndPassword.Contains("@")) {
* int atIndex = emailAndPassword.IndexOf('@');
* string[] top20TopDomains = { ".com", ".org", ".edu", ".gov", ".uk", ".net", ".ca", ".de", ".jp", ".fr", ".au", ".us", ".ru", ".ch", ".it", ".nl", ".se", ".no", ".es", ".mil" };
* foreach(string topDomain in top20TopDomains) {
* if(emailAndPassword.IndexOf(topDomain, atIndex, StringComparison.InvariantCultureIgnoreCase) > 0) {
* int passwordIndex = emailAndPassword.IndexOf(topDomain, atIndex, StringComparison.InvariantCultureIgnoreCase) + topDomain.Length;
* NetworkCredential cred = new NetworkCredential(session.ClientHost, session.ServerHost, "POP3", emailAndPassword.Substring(0, passwordIndex), emailAndPassword.Substring(passwordIndex), frame.Timestamp);
* this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
* credentialFound = true;
* this.updateCredential(cred, session);
* }
*
* }
* if(!credentialFound) {
* //it might be some less popular domain name
* int dotIndex = emailAndPassword.IndexOf('.', atIndex);
* if(dotIndex > 0) {
* int passwordIndex = dotIndex + 2;//just a guess, could be something else
* if(passwordIndex < emailAndPassword.Length) {
* NetworkCredential cred = new NetworkCredential(session.ClientHost, session.ServerHost, "POP3", emailAndPassword.Substring(0, passwordIndex), emailAndPassword.Substring(passwordIndex), frame.Timestamp);
* this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
* credentialFound = true;
* this.updateCredential(cred, session);
* }
* }
* }
* }
* if(!credentialFound && emailAndPassword.Length > 0) {
* NetworkCredential cred = new NetworkCredential(session.ClientHost, session.ServerHost, "POP3", emailAndPassword, emailAndPassword, frame.Timestamp);
* this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
* }
*/
}
//public int ExtractData(NetworkTcpSession tcpSession, NetworkHost sourceHost, NetworkHost destinationHost, IEnumerable<PacketParser.Packets.AbstractPacket> packetList) {
public int ExtractData(NetworkTcpSession tcpSession, bool transferIsClientToServer, IEnumerable <PacketParser.Packets.AbstractPacket> packetList)
{
/*
* NetworkHost sourceHost, destinationHost;
* if (transferIsClientToServer) {
* sourceHost = tcpSession.Flow.FiveTuple.ClientHost;
* destinationHost = tcpSession.Flow.FiveTuple.ServerHost;
* }
* else {
* sourceHost = tcpSession.Flow.FiveTuple.ServerHost;
* destinationHost = tcpSession.Flow.FiveTuple.ClientHost;
* }*/
SmtpSession smtpSession;
if (this.smtpSessionList.ContainsKey(tcpSession))
{
smtpSession = this.smtpSessionList[tcpSession];
}
else
{
smtpSession = new SmtpSession();
this.smtpSessionList.Add(tcpSession, smtpSession);
}
Packets.TcpPacket tcpPacket = null;
Packets.SmtpPacket smtpPacket = null;
foreach (Packets.AbstractPacket p in packetList)
{
if (p.GetType() == typeof(Packets.TcpPacket))
{
tcpPacket = (Packets.TcpPacket)p;
}
else if (p.GetType() == typeof(Packets.SmtpPacket))
{
smtpPacket = (Packets.SmtpPacket)p;
}
}
if (smtpPacket != null)
{
if (smtpPacket.ClientToServer)
{
if (smtpSession.State == SmtpSession.SmtpState.Username)
{
string base64Username = smtpPacket.ReadLine().Trim();
try {
byte[] usernameBytes = System.Convert.FromBase64String(base64Username);
smtpSession.Username = System.Text.ASCIIEncoding.ASCII.GetString(usernameBytes);
}
catch (FormatException e) { }
}
else if (smtpSession.State == SmtpSession.SmtpState.Password)
{
string base64Password = smtpPacket.ReadLine().Trim();
try {
byte[] passwordBytes = System.Convert.FromBase64String(base64Password);
smtpSession.Password = System.Text.ASCIIEncoding.ASCII.GetString(passwordBytes);
}
catch (FormatException e) { }
}
else if (smtpSession.State == SmtpSession.SmtpState.Data)
{
//write data to file until we receive "\n.\n" could also be \r\n.\r\n
smtpSession.AddData(smtpPacket.ParentFrame.Data, smtpPacket.PacketStartIndex, smtpPacket.PacketLength);
//check if state has transitioned over to footer
if (smtpSession.State == SmtpSession.SmtpState.Footer)
{
Mime.Email email = new Mime.Email(smtpSession.DataStream, base.MainPacketHandler, tcpPacket, transferIsClientToServer, tcpSession, ApplicationLayerProtocol.Smtp, FileTransfer.FileStreamAssembler.FileAssmeblyRootLocation.destination);
}
}
else
{
foreach (KeyValuePair <string, string> requestCommandAndArgument in smtpPacket.RequestCommandsAndArguments)
{
if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.HELO.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
string clientDomain = requestCommandAndArgument.Value;
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.EHLO.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
string clientDomain = requestCommandAndArgument.Value;
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.AUTH.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
if (requestCommandAndArgument.Value.Trim().StartsWith("LOGIN", StringComparison.InvariantCultureIgnoreCase))
{
//if (requestCommandAndArgument.Value.ToUpper().Contains("LOGIN")) {
smtpSession.State = SmtpSession.SmtpState.AuthLogin;
//SMTP clients sometimes send the email address right away like this: "AUTH LOGIN aGVqaG9wcEBpbnRlcm5ldC5zZQ=="
if (requestCommandAndArgument.Value.Length > "LOGIN ".Length)
{
try {
string base64Username = requestCommandAndArgument.Value.Substring("LOGIN ".Length).Trim();
byte[] usernameBytes = System.Convert.FromBase64String(base64Username);
smtpSession.Username = System.Text.ASCIIEncoding.ASCII.GetString(usernameBytes);
}
catch (ArgumentException) { }
}
}
else if (requestCommandAndArgument.Value.Trim().StartsWith("PLAIN", StringComparison.InvariantCultureIgnoreCase))
{
//AUTH PLAIN <base64-encoded username and password>
smtpSession.State = SmtpSession.SmtpState.AuthLogin;
//SMTP clients sometimes send the email address right away like this: "AUTH LOGIN aGVqaG9wcEBpbnRlcm5ldC5zZQ=="
if (requestCommandAndArgument.Value.Length > "PLAIN ".Length)
{
try {
string base64 = requestCommandAndArgument.Value.Substring("PLAIN ".Length).Trim();
NetworkCredential cred = SmtpPacketHandler.ExtractBase64EncodedAuthPlainCredential(base64, smtpPacket.ParentFrame, tcpSession, ApplicationLayerProtocol.Smtp);
if (cred != null)
{
//this.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
this.MainPacketHandler.AddCredential(cred);
}
}
catch (ArgumentException) { }
}
}
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.MAIL.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
if (requestCommandAndArgument.Value.StartsWith("FROM", StringComparison.InvariantCultureIgnoreCase))
{
int colonIndex = requestCommandAndArgument.Value.IndexOf(':');
if (colonIndex > 0 && requestCommandAndArgument.Value.Length > colonIndex + 1)
{
smtpSession.MailFrom = requestCommandAndArgument.Value.Substring(colonIndex + 1).Trim();
}
}
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.RCPT.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
if (requestCommandAndArgument.Value.StartsWith("TO", StringComparison.InvariantCultureIgnoreCase))
{
int colonIndex = requestCommandAndArgument.Value.IndexOf(':');
if (colonIndex > 0 && requestCommandAndArgument.Value.Length > colonIndex + 1)
{
smtpSession.AddRecipient(requestCommandAndArgument.Value.Substring(colonIndex + 1).Trim());
}
}
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.DATA.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
smtpSession.State = SmtpSession.SmtpState.Data;
}
else if (requestCommandAndArgument.Key.Equals(SmtpPacket.ClientCommands.STARTTLS.ToString(), StringComparison.InvariantCultureIgnoreCase))
{
smtpSession.State = SmtpSession.SmtpState.StartTlsRequested;
}
}
}
}
else //server to client
{
foreach (KeyValuePair <int, string> replyCodeAndArgument in smtpPacket.Replies)
{
if (replyCodeAndArgument.Key == 334) //AUTH LOGIN
{
if (replyCodeAndArgument.Value.Equals("VXNlcm5hbWU6"))
{
smtpSession.State = SmtpSession.SmtpState.Username;
}
else if (replyCodeAndArgument.Value.Equals("UGFzc3dvcmQ6"))
{
smtpSession.State = SmtpSession.SmtpState.Password;
}
}
else if (replyCodeAndArgument.Key == 235) //AUTHENTICATION SUCCESSFUL
{
base.MainPacketHandler.AddCredential(new NetworkCredential(tcpSession.ClientHost, tcpSession.ServerHost, smtpPacket.PacketTypeDescription, smtpSession.Username, smtpSession.Password, smtpPacket.ParentFrame.Timestamp));
smtpSession.State = SmtpSession.SmtpState.Authenticated;
}
else if (replyCodeAndArgument.Key >= 500) //error
{
smtpSession.State = SmtpSession.SmtpState.None;
}
else if (replyCodeAndArgument.Key == 354) //DATA "Start mail input; end with <CRLF>.<CRLF>"
{
smtpSession.State = SmtpSession.SmtpState.Data;
}
else if (replyCodeAndArgument.Key == 250) //"Requested mail action okay, completed"
{
if (smtpSession.State == SmtpSession.SmtpState.Footer)
{
//smtpSession.DataStream.Seek(0, System.IO.SeekOrigin.Begin);
smtpSession.DataStream = new System.IO.MemoryStream();
//System.Diagnostics.Debugger.Break();
}
smtpSession.State = SmtpSession.SmtpState.None;//Added in order to reset state when multiple SMTP sessions are sent within the same TCP session
}
else if (replyCodeAndArgument.Key == 220)
{
if (smtpSession.State == SmtpSession.SmtpState.StartTlsRequested)
{
tcpSession.ProtocolFinder.SetConfirmedApplicationLayerProtocol(ApplicationLayerProtocol.Ssl, false);
}
}
}
}
//There was a SMTP packet, so treat this as a sucsessfull extraction
return(tcpPacket.PayloadDataLength);
}
else //smtpPacket == null
{
return(0);
}
}
//public int ExtractData(NetworkTcpSession tcpSession, NetworkHost sourceHost, NetworkHost destinationHost, IEnumerable<AbstractPacket> packetList) {
public int ExtractData(NetworkTcpSession tcpSession, bool transferIsClientToServer, IEnumerable <PacketParser.Packets.AbstractPacket> packetList)
{
/*
* NetworkHost sourceHost, destinationHost;
* if (transferIsClientToServer) {
* sourceHost = tcpSession.Flow.FiveTuple.ClientHost;
* destinationHost = tcpSession.Flow.FiveTuple.ServerHost;
* }
* else {
* sourceHost = tcpSession.Flow.FiveTuple.ServerHost;
* destinationHost = tcpSession.Flow.FiveTuple.ClientHost;
* }*/
Packets.ImapPacket imapPacket = null;
Packets.TcpPacket tcpPacket = null;
foreach (Packets.AbstractPacket p in packetList)
{
if (p.GetType() == typeof(Packets.TcpPacket))
{
tcpPacket = (Packets.TcpPacket)p;
}
else if (p.GetType() == typeof(Packets.ImapPacket))
{
imapPacket = (Packets.ImapPacket)p;
}
}
if (tcpPacket != null && (tcpPacket.SourcePort == 220 || tcpPacket.SourcePort == 143) && this.lastCommand.ContainsKey(tcpSession) && this.lastCommand[tcpSession] == ImapPacket.ClientCommand.UID && this.serverToClientEmailReassemblers.ContainsKey(tcpSession))
{
return(this.ExtractEmail(tcpSession, tcpPacket, tcpPacket.PacketStartIndex + tcpPacket.DataOffsetByteCount, tcpPacket.PayloadDataLength));
}
else if (tcpPacket != null && (tcpPacket.DestinationPort == 220 || tcpPacket.DestinationPort == 143) && this.lastCommand.ContainsKey(tcpSession) && this.lastCommand[tcpSession] == ImapPacket.ClientCommand.APPEND && this.clientToServerEmailReassemblers.ContainsKey(tcpSession))
{
return(this.ExtractEmail(tcpSession, tcpPacket, tcpPacket.PacketStartIndex + tcpPacket.DataOffsetByteCount, tcpPacket.PayloadDataLength));
}
else if (tcpPacket != null && imapPacket != null)
{
if (imapPacket.ClientToServer)
{
if (imapPacket.Command != null)
{
if (lastCommand.ContainsKey(tcpSession))
{
lastCommand[tcpSession] = imapPacket.Command.Value;
}
else
{
lastCommand.Add(tcpSession, imapPacket.Command.Value);
}
if (imapPacket.FullRequestOrResponseLine != null && imapPacket.FullRequestOrResponseLine.Length > 0)
{
System.Collections.Specialized.NameValueCollection parameters = new System.Collections.Specialized.NameValueCollection();
parameters.Add(imapPacket.Command.Value.ToString(), imapPacket.FullRequestOrResponseLine);
base.MainPacketHandler.OnParametersDetected(new Events.ParametersEventArgs(imapPacket.ParentFrame.FrameNumber, tcpSession.Flow.FiveTuple, transferIsClientToServer, parameters, imapPacket.ParentFrame.Timestamp, "IMAP Client Command"));
}
//remove any old email reassemblers since we have now received a new command
if (this.serverToClientEmailReassemblers.ContainsKey(tcpSession))
{
this.serverToClientEmailReassemblers[tcpSession].Close();
this.serverToClientEmailReassemblers.Remove(tcpSession);//we will need to create a new reassembler
}
if (imapPacket.Command == ImapPacket.ClientCommand.APPEND)
{
//an email is being uploaded to the server
if (imapPacket.BodyLength > 0)
{
int emailBytes = this.ExtractEmail(tcpSession, tcpPacket, imapPacket.PacketStartIndex + imapPacket.ParsedBytesCount, imapPacket.PacketLength - imapPacket.ParsedBytesCount, imapPacket.BodyLength, true);
imapPacket.ParsedBytesCount += emailBytes;
}
}
else if (imapPacket.Command == ImapPacket.ClientCommand.LOGIN)
{
string[] args = imapPacket.FullRequestOrResponseLine.Split(new char[] { ' ' });
char[] quoteChars = new char[] { '\'', '"' };
//a001 LOGIN SMITH SESAME
if (args.Length > 3)
{
string username = args[2].Trim(quoteChars);
string password = args[3].Trim(quoteChars);
NetworkCredential cred = new NetworkCredential(tcpSession.ClientHost, tcpSession.ServerHost, "IMAP", username, password, imapPacket.ParentFrame.Timestamp);
//base.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
base.MainPacketHandler.AddCredential(cred);
}
}
}
else if (lastCommand.ContainsKey(tcpSession) && lastCommand[tcpSession] == ImapPacket.ClientCommand.AUTHENTICATE)
{
if (imapPacket.FullRequestOrResponseLine != null && imapPacket.FullRequestOrResponseLine.Length > 0)
{
string base64 = imapPacket.FullRequestOrResponseLine;
NetworkCredential cred = SmtpPacketHandler.ExtractBase64EncodedAuthPlainCredential(base64, imapPacket.ParentFrame, tcpSession, ApplicationLayerProtocol.Imap);
if (cred != null)
{
//base.MainPacketHandler.OnCredentialDetected(new Events.CredentialEventArgs(cred));
base.MainPacketHandler.AddCredential(cred);
if (imapPacket.ParsedBytesCount == 0)
{
imapPacket.ParsedBytesCount = base64.Length + 2;//add CRLF
}
}
}
}
}
else //server to client
{
if (imapPacket.Result != null && imapPacket.FullRequestOrResponseLine != null && imapPacket.FullRequestOrResponseLine.Length > 0)
{
System.Collections.Specialized.NameValueCollection parameters = new System.Collections.Specialized.NameValueCollection();
parameters.Add(imapPacket.Result.Value.ToString(), imapPacket.FullRequestOrResponseLine);
base.MainPacketHandler.OnParametersDetected(new Events.ParametersEventArgs(imapPacket.ParentFrame.FrameNumber, tcpSession.Flow.FiveTuple, transferIsClientToServer, parameters, imapPacket.ParentFrame.Timestamp, "IMAP Server Response"));
}
if (lastCommand.ContainsKey(tcpSession) && (lastCommand[tcpSession] == ImapPacket.ClientCommand.FETCH || lastCommand[tcpSession] == ImapPacket.ClientCommand.UID))
{
if (imapPacket.Command != null && imapPacket.FullRequestOrResponseLine != null && imapPacket.FullRequestOrResponseLine.Length > 0)
{
System.Collections.Specialized.NameValueCollection parameters = new System.Collections.Specialized.NameValueCollection();
parameters.Add(imapPacket.Command.Value.ToString(), imapPacket.FullRequestOrResponseLine);
base.MainPacketHandler.OnParametersDetected(new Events.ParametersEventArgs(imapPacket.ParentFrame.FrameNumber, tcpSession.Flow.FiveTuple, transferIsClientToServer, parameters, imapPacket.ParentFrame.Timestamp, "IMAP Untagged Response"));
}
//the server might push an email here
if (imapPacket.BodyLength > 0)
{
int emailBytes = this.ExtractEmail(tcpSession, tcpPacket, imapPacket.PacketStartIndex + imapPacket.ParsedBytesCount, imapPacket.PacketLength - imapPacket.ParsedBytesCount, imapPacket.BodyLength, false);
if (imapPacket.ParenthesesDiff > 0 && imapPacket.ParsedBytesCount + emailBytes < imapPacket.PacketLength)
{
//we might have a trailing line that closes the parenthesis, let's read that one too
int index = imapPacket.PacketStartIndex + imapPacket.ParsedBytesCount + emailBytes;
string trailingLine = Utils.ByteConverter.ReadLine(imapPacket.ParentFrame.Data, ref index);
int trailingParenthesesDiff = trailingLine.Split('(').Length - trailingLine.Split(')').Length;
if (imapPacket.ParenthesesDiff + trailingParenthesesDiff == 0)
{
return(index - imapPacket.PacketStartIndex);
}
else
{
return(imapPacket.ParsedBytesCount + emailBytes);
}
}
else
{
return(imapPacket.ParsedBytesCount + emailBytes);
}
}
}
else if (lastCommand.ContainsKey(tcpSession) && (lastCommand[tcpSession] == ImapPacket.ClientCommand.STARTTLS))
{
if (imapPacket.Result == ImapPacket.ServerResult.OK)
{
//1 OK Begin TLS negotiation now
//do the same protocol switch trick as in SocksPacketHandler
//tcpSession.ProtocolFinder = new TcpPortProtocolFinder(tcpSession.ClientHost, tcpSession.ServerHost, tcpSession.ClientTcpPort, tcpSession.ServerTcpPort, tcpPacket.ParentFrame.FrameNumber, tcpPacket.ParentFrame.Timestamp, base.MainPacketHandler);
tcpSession.ProtocolFinder.SetConfirmedApplicationLayerProtocol(ApplicationLayerProtocol.Ssl, false);
}
}
}
return(imapPacket.ParsedBytesCount);
}
else
{
return(0);
}
}
