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SFTP Key Exchange Process in FileZilla FTP Client
How to see the key exchange process in an SFTP connection with FileZilla FTP Client?
✍: FYIcenter.com
If you are connecting to a SFTP server, FileZilla FTP Client needs to go through a handshake process to exchange a secret key with the FTP server. The exchanged secret key will be used to encrypt all subsequent communications in the SFTP session.
You can turn on the Debug message in the log file to see the key exchange process and to know what types of algorithms are used. Below is a good example of a SFTP handshake process for exchanging a secret key:
Status: Connecting to ftp.somebody.com... Trace: Going to execute C:\Program Files\FileZilla FTP Client\fzsftp.exe Response: fzSftp started, protocol_version=7 Trace: CSftpControlSocket::ConnectParseResponse(fzSftp started, protocol_version=7) Trace: CSftpControlSocket::SendNextCommand() Trace: CSftpControlSocket::ConnectSend() Command: open "username@ftp.somebody.com" 22 Trace: Connecting to xx,xx,xx,xx port 22 Trace: We claim version: SSH-2.0-PuTTY_Local:_timestamp_ Trace: Server version: SSH-2.0-1.36_sshlib GlobalSCAPE Trace: We believe remote version ignores SSH-2 maximum packet size Trace: Using SSH protocol version 2 Trace: Doing Diffie-Hellman group exchange Trace: Doing Diffie-Hellman key exchange with hash SHA-1 Trace: Host key fingerprint is: Trace: ssh-dss 1024 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx Trace: Initialised AES-256 CBC client->server encryption Trace: Initialised HMAC-SHA1 client->server MAC algorithm Trace: Initialised AES-256 CBC server->client encryption Trace: Initialised HMAC-SHA1 server->client MAC algorithm Trace: Further authentication required Command: Pass: ******** Trace: Sent password Trace: Access granted Trace: Opening session as main channel Trace: Opened main channel Trace: Started a shell/command Status: Connected to ftp.somebody.com Trace: CSftpControlSocket::ConnectParseResponse() Trace: CSftpControlSocket::ResetOperation(0) Trace: CControlSocket::ResetOperation(0) Trace: CFileZillaEnginePrivate::ResetOperation(0) Status: Retrieving directory listing... Trace: CSftpControlSocket::SendNextCommand() Trace: CSftpControlSocket::ChangeDirSend() Command: pwd Response: Current directory is: "/" Trace: CSftpControlSocket::ResetOperation(0) Trace: CControlSocket::ResetOperation(0) Trace: CSftpControlSocket::ParseSubcommandResult(0) Trace: CSftpControlSocket::ListSubcommandResult() Trace: state = 1 Trace: CSftpControlSocket::SendNextCommand() Trace: CSftpControlSocket::ListSend() Trace: state = 3 Command: ls Status: Listing directory / Trace: CSftpControlSocket::ListParseResponse() Trace: CSftpControlSocket::ResetOperation(0) Trace: CControlSocket::ResetOperation(0) Status: Directory listing of "/" successful ...
Notes on the above example:
⇒ Uninstall FileZilla FTP Client
2016-11-11, 5320🔥, 0💬
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