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Dear developers,

I am currently working on an SFTP-Proxy project and I noticed a bug in your software. When closing a file handle, according to the ​SFTP specification version 12, page 35 it states the following:

The response to this request will be a SSH_FXP_STATUS message. Note that on some server platforms even a close can fail. For example, if the server operating system caches writes, and an error occurs while flushing cached writes, the close operation may fail.

In my case this is exactly what happens. When a file is not permitted through the proxy, the CLOSE will fail. The SFTP_Client from the command line in Fedora 25 respects that and will display an error if the upload is not permitted.

Screenshot from SFTP from command line:

However, FileZilla will mark the upload as a success, even though it may have failed. The only way to verify this is to look into the directory, where the failed file will not appear. However, this could be very confusing for our users and can lead to data loss.

Screenshot from FileZilla:

FileZilla Logfile:

2016-12-12 14:24:59 6847 1 Status: Connecting to 172.18.0.4:2200...
2016-12-12 14:24:59 6847 1 Status: Connection established, waiting for welcome message...
2016-12-12 14:24:59 6847 1 Response: SSH-2.0-paramiko_2.0.2
2016-12-12 14:24:59 6847 1 Error: Cannot establish FTP connection to an SFTP server. Please select proper protocol.
2016-12-12 14:24:59 6847 1 Error: Critical error: Could not connect to server
2016-12-12 14:25:07 6847 1 Status: Disconnected from server
2016-12-12 14:25:07 6847 1 Status: Connecting to 172.18.0.4:2200...
2016-12-12 14:25:07 6847 1 Response: fzSftp started, protocol_version=7
2016-12-12 14:25:07 6847 1 Command: open "root@192.168.122.97:22@172.18.0.4" 2200
2016-12-12 14:25:08 6847 1 Command: Trust new Hostkey: Once
2016-12-12 14:25:08 6847 1 Command: Pass: ***
2016-12-12 14:25:08 6847 1 Status: Connected to 172.18.0.4
2016-12-12 14:25:08 6847 1 Status: Retrieving directory listing...
2016-12-12 14:25:08 6847 1 Command: pwd
2016-12-12 14:25:08 6847 1 Response: Current directory is: "/"
2016-12-12 14:25:08 6847 1 Command: ls
2016-12-12 14:25:08 6847 1 Status: Listing directory /
2016-12-12 14:25:08 6847 1 Status: Directory listing of "/" successful
2016-12-12 14:25:10 6847 1 Status: Retrieving directory listing of "/home"...
2016-12-12 14:25:10 6847 1 Command: cd "home"
2016-12-12 14:25:10 6847 1 Response: New directory is: "/home"
2016-12-12 14:25:10 6847 1 Command: ls
2016-12-12 14:25:10 6847 1 Status: Listing directory /home
2016-12-12 14:25:10 6847 1 Status: Directory listing of "/home" successful
2016-12-12 14:25:40 6847 1 Status: Retrieving directory listing of "/home"...
2016-12-12 14:25:40 6847 1 Command: ls
2016-12-12 14:25:40 6847 1 Status: Listing directory /home
2016-12-12 14:25:40 6847 1 Status: Directory listing of "/home" successful
2016-12-12 14:25:46 6847 2 Status: Connecting to 172.18.0.4:2200...
2016-12-12 14:25:46 6847 2 Response: fzSftp started, protocol_version=7
2016-12-12 14:25:46 6847 2 Command: open "root@192.168.122.97:22@172.18.0.4" 2200
2016-12-12 14:25:46 6847 2 Command: Trust new Hostkey: Once
2016-12-12 14:25:46 6847 2 Command: Pass: ***
2016-12-12 14:25:46 6847 2 Status: Connected to 172.18.0.4
2016-12-12 14:25:46 6847 2 Status: Starting upload of /home/deigner/Desktop/test_approve.txt
2016-12-12 14:25:46 6847 2 Command: cd "/home"
2016-12-12 14:25:46 6847 2 Response: New directory is: "/home"
2016-12-12 14:25:46 6847 2 Command: put "/home/deigner/Desktop/test_approve.txt" "test_approve.txt"
2016-12-12 14:25:46 6847 2 Command: local:/home/deigner/Desktop/test_approve.txt => remote:/home/test_approve.txt
2016-12-12 14:25:47 6847 2 Status: File transfer successful, transferred 20 bytes in 1 second
2016-12-12 14:25:48 6847 2 Status: Retrieving directory listing of "/home"...
2016-12-12 14:25:48 6847 2 Command: ls
2016-12-12 14:25:48 6847 2 Status: Listing directory /home
2016-12-12 14:25:48 6847 2 Status: Directory listing of "/home" successful
2016-12-12 14:25:50 6847 2 Status: Starting upload of /home/deigner/Desktop/test_deny
2016-12-12 14:25:50 6847 2 Command: put "/home/deigner/Desktop/test_deny" "test_deny"
2016-12-12 14:25:50 6847 2 Command: local:/home/deigner/Desktop/test_deny => remote:/home/test_deny
2016-12-12 14:25:52 6847 2 Status: File transfer successful, transferred 14 bytes in 2 seconds
2016-12-12 14:25:52 6847 2 Status: Retrieving directory listing of "/home"...
2016-12-12 14:25:52 6847 2 Command: ls
2016-12-12 14:25:52 6847 2 Status: Listing directory /home
2016-12-12 14:25:52 6847 2 Status: Directory listing of "/home" successful

If the connection drops during the first part of a "Create directory and enter it" operation, FileZilla will reconnect but resume with the second command. E.g.:

10:39:13	Command:	MKD newdir
10:39:18	Error:	Connection timed out
10:39:18	Status:	Connecting to 123.123.123.123:21...
10:39:18	Status:	Connection established, waiting for welcome message...
    // login snipped
10:39:18	Response:	230 OK. Current restricted directory is /
10:39:18	Command:	OPTS UTF8 ON
10:39:18	Response:	200 OK, UTF-8 enabled
10:39:18	Status:	Connected
10:39:18	Status:	Retrieving directory listing...
10:39:18	Command:	CWD /public_html/newdir
10:39:18	Response:	550 Can't change directory to /public_html/newdir: No such file or directory
10:39:18	Error:	Failed to retrieve directory listing

FileZilla should complete the failed MKDIR command before attempting the CWD.