[CAMEL-18264] Camel SFTP: Cannot configure JSch client to use ssh-dss key

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.14.4, 3.18.0
• Fix Version/s: 3.14.5, 3.18.1, 3.19.0
• Component/s: camel-sftp

Environment

Tested with Apache Camel 3.17.0 and 3.18.0

• Estimated Complexity: Unknown
• Assignee: Unassigned
• Reporter: Konrad Stachera
• Created: 11/Jul/22 08:38
• Updated: 15/Aug/22 06:57
• Resolved: 31/Jul/22 09:13

Description

When server requires ssh-dss host key algorithm it is not possible to configure sFTP camel component to use such key type, therefore connecting fails with "com.jcraft.jsch.JSchException: Algorithm negotiation fail". 

When these two properties are added in debug mode:

session.setConfig("server_host_key", session.getConfig("server_host_key") + ",ssh-dss") 
session.setConfig("PubkeyAcceptedAlgorithms", session.getConfig("PubkeyAcceptedAlgorithms") + ",ssh-dss") 

in SftpOperations class:

the connection is established successfully.

It should be possible to configure "server_host_key" and "PubkeyAcceptedAlgorithms" in camel sFTP component.

Issue Links

• links to: GitHub Pull Request #8077