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https://issues.apache.org/jira/browse/WAGON-564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov updated WAGON-564:
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Summary: SSH connection failure because 'preferredAuthentications' is
ignored if 'password' isn't set (was: ssh connection failure since
'preferredAuthentications' is ignored if 'password' is missing)
> SSH connection failure because 'preferredAuthentications' is ignored if
> 'password' isn't set
> --------------------------------------------------------------------------------------------
>
> Key: WAGON-564
> URL: https://issues.apache.org/jira/browse/WAGON-564
> Project: Maven Wagon
> Issue Type: Bug
> Components: wagon-ssh
> Affects Versions: 3.3.3
> Reporter: Lucian Burja
> Assignee: Michael Osipov
> Priority: Major
> Fix For: waiting-for-feedback
>
>
> I am trying to upload a file via SSH with private key authentication, using
> the {{wagon-maven-plugin}} plugin. The Linux server that is also integrated
> with Kerberos (which I don't use).
> Although I provide a valid {{privateKey}}, and I set
> {{<preferredAuthentications>publickey</preferredAuthentications>,}} the
> Kerberos authentication is always triggered.
> While investigating, I have found the following root cause:
> In settings.xml, for a {{<server>}} you can decide to use SSH key based
> authentication instead of username/password:
> {code:java}
> <server>
> <id>myserver</id>
> <username>bamboo</username>
> <privateKey>...path to the file...</privateKey>
> <configuration>
> <preferredAuthentications>publickey</preferredAuthentications>
> </configuration>
> </server>
> {code}
> According to the documentation, this authentication option only works if you
> omit the {{password}} element, otherwise {{privateKey}} is ignored.
> However, if {{password}} is omitted, then {{preferredAuthentications}} is
> ignored, as can be seen in {{AbstractJschWagon.java :: openConnectionInternal
> (line 254)}}
> {code:java}
> if ( authenticationInfo.getPassword() != null )
> {
> config.setProperty( "PreferredAuthentications", preferredAuthentications
> );
> }
> {code}
>
> Thus, in practice, if you use {{privateKey}} based authentication, you cannot
> control the {{PreferredAuthentications}} parameter, and the default value is
> used: {{gssapi-with-mic,publickey,password,keyboard-interactive}}. This
> triggers Kerberos based authentication as the first option.
> A simple patch to solve this issue is to add to the lines above an else
> branch, like this:
> {code:java}
> if ( authenticationInfo.getPassword() != null )
> {
> config.setProperty( "PreferredAuthentications",
> preferredAuthentications );
> }
> else if (
> !"gssapi-with-mic,publickey,password,keyboard-interactive".equals(
> preferredAuthentications ) )
> {
> // if different then the default, always set
> config.setProperty( "PreferredAuthentications",
> preferredAuthentications );
> }
> {code}
> or to remove the the surrounding if-statement all-together
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