Can I use alias in ssh config ?

[cadem]

If I use --ssh=ssh parameter in xpra_cmd.exe, can I use host alias name in .ssh/config file?
And can I specify --ssh parameter when I use gui?

[totaam]

I thought it would be easier to try than to ask!
Yes, when xpra execs ssh, ssh will do whatever it normally does.
Run xpra with Xpra_cmd.exe -d ssh attach ssh://user@host/ to see more details.

[cadem]

If I don't specify --ssh=ssh, I can connect successfully. But when I add --ssh=ssh, connection will failed.

"c:\Program Files\Xpra\Xpra_cmd.exe" -d ssh --ssh=ssh attach ssh://ubuntu@127.0.0.1:40221/100

2024-05-03 22:21:29,452 Xpra GTK3 client version 6.0-r0
2024-05-03 22:21:29,763  running on Microsoft Windows Microsoft Windows Server 2022 Standard
2024-05-03 22:21:29,763  cpython 3.11
2024-05-03 22:21:32,214 GStreamer version 1.24.2
2024-05-03 22:21:32,231 created named pipe 'Xpra\9412'
2024-05-03 22:21:32,560 keyboard layout 'Chinese (Simplified) - US Keyboard' : 'cn' (0x804)
2024-05-03 22:21:32,659 debug enabled for ['xpra.net.ssh.exec_client', 'network', 'ssh']
2024-05-03 22:21:32,665 executing ssh command: ssh -l ubuntu -p 40221 -T 127.0.0.1 'sh -c '"'"'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi'"'"''
2024-05-03 22:21:32,676  keyboard settings: layout=cn
2024-05-03 22:21:32,676  desktop size is 1600x1200:
2024-05-03 22:21:32,676   Default (423x317 mm - DPI: 96x96) workarea: 1600x1160
2024-05-03 22:21:32,676     通用非即插即用监视器       (423x318 mm)
2024-05-03 22:21:32,922 SSH EOF on stderr of ['ssh', '-l', 'ubuntu', '-p', '40221', '-T', '127.0.0.1', 'sh -c \'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi\'']
2024-05-03 22:21:32,922 remote SSH stderr:
2024-05-03 22:21:32,922 Error: failed to receive anything, not an xpra server?
2024-05-03 22:21:32,922  Host key verification failed.
2024-05-03 22:21:32,922   could also be the wrong protocol, username, password or port
2024-05-03 22:21:32,922   or the session was not found
2024-05-03 22:21:32,922 Connection failed

[totaam]

Is your ssh server on port 40221? Or is it an xpra server that is forwarded to this port?
The xpra client runs:

ssh -l ubuntu -p 40221 -T 127.0.0.1 'sh -c '"'"'if command -v "xpra" > /dev/null 2>&1; then... '"'"''

The quotes look wrong to me. Perhaps it comes from here:

xpra/xpra/net/ssh/exec_client.py

Lines 88 to 90 in 558127f

	if nssh >= 2 and MAGIC_QUOTES:
	for _ in range(nssh):
	remote_cmd = shlex.quote(remote_cmd)

In which case running with xpra_cmd.exe --env=XPRA_SSH_MAGIC_QUOTES=0 ... might help.

[cadem]

I forward remote ssh(22) to local(40221).

I run the following command and paste result.

1. "c:\Program Files\Xpra\Xpra_cmd.exe" -d ssh attach ssh://ubuntu@127.0.0.1:40221/100
   show remote app sucessfully.

2."c:\Program Files\Xpra\Xpra_cmd.exe" -d ssh --ssh=ssh attach ssh://ubuntu@127.0.0.1:40221/100

2024-05-05 15:29:11,897 Xpra GTK3 client version 6.0-r0
2024-05-05 15:29:12,230  running on Microsoft Windows Microsoft Windows Server 2022 Standard
2024-05-05 15:29:12,230  cpython 3.11
2024-05-05 15:29:14,638 GStreamer version 1.24.2
2024-05-05 15:29:14,647 created named pipe 'Xpra\8856'
2024-05-05 15:29:14,960 keyboard layout 'Chinese (Simplified) - US Keyboard' : 'cn' (0x804)
2024-05-05 15:29:15,053 debug enabled for ['xpra.net.ssh.exec_client', 'network', 'ssh']
2024-05-05 15:29:15,069 executing ssh command: ssh -l ubuntu -p 40221 -T 127.0.0.1 'sh -c '"'"'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi'"'"''
2024-05-05 15:29:15,085  keyboard settings: layout=cn
2024-05-05 15:29:15,093  desktop size is 1600x1200:
2024-05-05 15:29:15,093   Default (423x317 mm - DPI: 96x96) workarea: 1600x1160
2024-05-05 15:29:15,093     通用非即插即用监视器       (423x318 mm)
2024-05-05 15:29:15,337 SSH EOF on stderr of ['ssh', '-l', 'ubuntu', '-p', '40221', '-T', '127.0.0.1', 'sh -c \'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi\'']
2024-05-05 15:29:15,337 remote SSH stderr:
2024-05-05 15:29:15,337  Host key verification failed.
2024-05-05 15:29:15,337 Error: failed to receive anything, not an xpra server?
2024-05-05 15:29:15,337   could also be the wrong protocol, username, password or port
2024-05-05 15:29:15,337   or the session was not found
2024-05-05 15:29:15,337 Connection failed

3.ssh -l ubuntu -p 40221 -T 127.0.0.1 'sh -c '"'"'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi'"'"''
The system cannot find the path specified.

4. "c:\Program Files\Xpra\Xpra_cmd.exe" -d ssh --ssh=ssh --env=XPRA_SSH_MAGIC_QUOTES=0 attach ssh://ubuntu@127.0.0.1:40221/100

2024-05-05 15:32:51,715 Xpra GTK3 client version 6.0-r0
2024-05-05 15:32:52,020  running on Microsoft Windows Microsoft Windows Server 2022 Standard
2024-05-05 15:32:52,030  cpython 3.11
2024-05-05 15:32:54,365 GStreamer version 1.24.2
2024-05-05 15:32:54,371 created named pipe 'Xpra\10572'
2024-05-05 15:32:54,684 keyboard layout 'Chinese (Simplified) - US Keyboard' : 'cn' (0x804)
2024-05-05 15:32:54,784 debug enabled for ['xpra.net.ssh.exec_client', 'network', 'ssh']
2024-05-05 15:32:54,784 executing ssh command: ssh -l ubuntu -p 40221 -T 127.0.0.1 'sh -c '"'"'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi'"'"''
2024-05-05 15:32:54,801  keyboard settings: layout=cn
2024-05-05 15:32:54,817  desktop size is 1600x1200:
2024-05-05 15:32:54,817   Default (423x317 mm - DPI: 96x96) workarea: 1600x1160
2024-05-05 15:32:54,817     通用非即插即用监视器       (423x318 mm)
2024-05-05 15:32:55,052 SSH EOF on stderr of ['ssh', '-l', 'ubuntu', '-p', '40221', '-T', '127.0.0.1', 'sh -c \'if command -v "xpra" > /dev/null 2>&1; then xpra _proxy "100";elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ]; then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy "100";elif [ -x /usr/local/bin/xpra ]; then /usr/local/bin/xpra _proxy "100";elif [ -x ~/.xpra/run-xpra ]; then ~/.xpra/run-xpra _proxy "100";elif [ -x Xpra_cmd.exe ]; then Xpra_cmd.exe _proxy "100";else echo "no run-xpra command found"; exit 1; fi\'']
2024-05-05 15:32:55,052 remote SSH stderr:
2024-05-05 15:32:55,052 Error: failed to receive anything, not an xpra server?
2024-05-05 15:32:55,052  Host key verification failed.
2024-05-05 15:32:55,052   could also be the wrong protocol, username, password or port
2024-05-05 15:32:55,052   or the session was not found
2024-05-05 15:32:55,052 Connection failed

[totaam]

@cadem as per #4207 (comment), have you tried running with magic quotes off?

Silly question: how is ssh installed on MS Windows?
Using ssh=ssh is not a supported configuration on MS Windows, ssh=plink is, and only for non-light builds.

[cadem]

1. I had openssh installed on my windows,
   C:\Users\Administrator>ssh -V
   OpenSSH_for_Windows_9.4p1, LibreSSL 3.7.3

2. I plink, it works, but plink doesn't support alias name in .ssh/config file.

[totaam]

So, I gave it a go and it is definitely possible, but tricky.
There seems to be some conflict between the system parsing xpra's command, then xpra parsing the ssh option within that, then the windows shell parsing the command again when we execute ssh..

FWIW, with 6.1-r35740, I can connect via ssh using openssh:

./Xpra_cmd.exe attach ssh://192.168.0.10:10000/ \
    -d ssh --ssh="ssh -v -o UserKnownHostsFile='C:\msys64\home\Windows\ 10\ Test\.ssh\known_hosts'"

But beware that anything which requires user interaction (password or key passphrase, etc) will fail and show this in the output with ssh -v:

 debug1: read_passphrase: can't open /dev/tty: No such device or address

That's because the stdin, stdout and stderr pipes are attached to the parent xpra process so that it can use them to communicate with the remote proxy.

And I have no idea how to tell ssh to use either our own tool for the prompts (what SSH_ASKPASS is meant to do) or how to make it use another tty.. (ie: tty outputs /dev/pty0 on my system).

Some links:

• PowerShell Win32-OpenSSH : TTY PTY support in Windows OpenSSH
• sshpass does not work with Windows Terminal app and msys2 console
• MSYS2: Terminals
• How does MSYS2 differ from Cygwin? Automatic path mangling of command line arguments and environment variables to Windows form on the fly: Filesystem namespaces