[GUACAMOLE-1497] Guacamole 1.4.0 ssh client seems to have host key sig compatibility issues with my ssh server

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 1.4.0
• Component/s: SSH
• Assignee: Unassigned
• Reporter: Colin Gordon
• Created: 12/Jan/22 21:40
• Updated: 29/Dec/22 23:41
• Resolved: 17/Jan/22 20:44

Description

Gaucamole fails to establish a connection to my piKVM via SSH.

Guacd reports "SSH handshake failed" in the logs.

I took a pcap and noticed that the guacamole client seems to only support two server host key algorithms: ssh-rsa and ssh-dss. The ssh server doesn't support either of those two. I infer that this is the cause of the ssh handshake failure. 

From googling around, openssh no longer supports ssh-rsa so it seems like a deprecation issue. My suggested fix would be for the guac ssh client to support additional server host key algorithms.

PCAP attached. The client (guac) is 100.76.173.55 and the server is 100.97.86.50.

Issue Links

• is duplicated by: GUACAMOLE-1619 SSH Server > 8.5 - Guacamole