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https://issues.apache.org/jira/browse/SSHD-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17741544#comment-17741544
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Tobias Gierke commented on SSHD-1329:
-------------------------------------
This question leads to
org.apache.sshd.client.session.AbstractClientSession#getKeyIdentityProvider
2.10.0
getKeyIdentityProvider() is being called with "keyIdentityProvider" being the
"EMPTY" provider
!image-2023-07-10-12-39-26-768.png!
and since resolveEffectiveProvider is just a checking for NULL but not the
"EMPTY" provider, it returns the "EMPTY" provider.
!image-2023-07-10-12-40-44-093.png!
2.9.2
When getKeyIdentityProvider() is being called, the "keyIdentityProvider" field
is set to NULL (not the "EMPTY" provider as in 2.10.0) so
resolveEffectiveProvider() returns the "inherited" argument which happens to be
the org.apache.sshd.common.keyprovider.FileKeyPairProvider that's gone missing
in 2.10.0
!image-2023-07-10-12-43-11-445.png!
> SSH Public key authentication works with 2.9.2 but fails with 2.10.0
> --------------------------------------------------------------------
>
> Key: SSHD-1329
> URL: https://issues.apache.org/jira/browse/SSHD-1329
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.10.0
> Reporter: Tobias Gierke
> Priority: Major
> Attachments: failure_2.10.0.log, image-2023-06-26-17-10-43-547.png,
> image-2023-07-10-11-16-03-470.png, image-2023-07-10-11-31-54-206.png,
> image-2023-07-10-11-48-25-736.png, image-2023-07-10-11-54-05-391.png,
> image-2023-07-10-11-56-35-508.png, image-2023-07-10-12-04-00-532.png,
> image-2023-07-10-12-08-39-123.png, image-2023-07-10-12-12-02-825.png,
> image-2023-07-10-12-24-22-392.png, image-2023-07-10-12-25-51-220.png,
> image-2023-07-10-12-28-40-339.png, image-2023-07-10-12-38-23-160.png,
> image-2023-07-10-12-39-26-768.png, image-2023-07-10-12-40-44-093.png,
> image-2023-07-10-12-43-11-445.png, sshd-bug-test.tgz, success_2.9.2.log
>
>
> After upgrading to Apache SSHD 2.10.0 we noticed that SSH public key
> authentication stopped working.
> On 2.9.2 the handshake looks like this:
> {code:java}
> 2023-06-19T13:12:18,405 [sshd-SshClient[1255b1d1]-nio2-thread-4|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> processUserAuth(ClientSessionImpl[[email protected]/192.168.188.250:22]
> ) Received SSH_MSG_USERAUTH_FAILURE - partial=false,
> methods=publickey,gssapi-keyex,gssapi-with-mic,password
> 2023-06-19T13:12:18,405 [sshd-SshClient[1255b1d1]-nio2-thread-4|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22])
> starti
> ng authentication mechanisms: client=[publickey, keyboard-interactive,
> password], server=[publickey, gssapi-keyex, gssapi-with-mic, password]
> 2023-06-19T13:12:18,405 [sshd-SshClient[1255b1d1]-nio2-thread-4|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22])
> attempting method=publickey
> 2023-06-19T13:12:18,416 [sshd-SshClient[1255b1d1]-nio2-thread-4|] TRACE
> org.apache.sshd.common.config.keys.loader.pem.RSAPEMResourceKeyPairParser []
> - -----BEGIN RSA PRIVATE KEY----- [chunk #1](16/609)
> 30:82:02:5d:02:01:00:02:81:81:00:c1:a3:3a:25:23 0..].........:%#
> ..... {code}
> while on 2.10.0 the key is not found/loaded:
> {code:java}
> 2023-06-19T13:13:41,529 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientSessionImpl [] -
> doHandleMessage(ClientSessionImpl[[email protected]/192.168.188.250:22])
> process #5 SSH_MSG_USERAUTH_FAILURE
> 2023-06-19T13:13:41,529 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> processUserAuth(ClientSessionImpl[[email protected]/192.168.188.250:22])
> Received SSH_MSG_USERAUTH_FAILURE - partial=false,
> methods=publickey,gssapi-keyex,gssapi-with-mic,password
> 2023-06-19T13:13:41,529 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22])
> starting authentication mechanisms: client=[publickey, keyboard-interactive,
> password], server=[publickey, gssapi-keyex, gssapi-with-mic, password]
> 2023-06-19T13:13:41,530 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22])
> attempting method=publickey
> 2023-06-19T13:13:41,532 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.auth.pubkey.UserAuthPublicKey [] -
> resolveAttemptedPublicKeyIdentity(ClientSessionImpl[[email protected]/192.168.188.250:22])[ssh-connection]
> no more keys to send
> 2023-06-19T13:13:41,532 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22]) no
> initial request sent by method=publickey
> 2023-06-19T13:13:41,532 [sshd-SshClient[495083a0]-nio2-thread-6|] TRACE
> org.apache.sshd.client.auth.pubkey.UserAuthPublicKey [] -
> releaseKeys(ClientSessionImpl[[email protected]/192.168.188.250:22])
> closing
> UserAuthPublicKeyIterator[ClientSessionImpl[[email protected]/192.168.188.250:22]]
> 2023-06-19T13:13:41,532 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.auth.pubkey.UserAuthPublicKey [] -
> destroy(ClientSessionImpl[[email protected]/192.168.188.250:22])[ssh-connection]
> 2023-06-19T13:13:41,533 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22])
> attempting method=password
> 2023-06-19T13:13:41,534 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.auth.password.UserAuthPassword [] -
> resolveAttemptedPassword(ClientSessionImpl[[email protected]/192.168.188.250:22])[ssh-connection]
> no more passwords to send
> 2023-06-19T13:13:41,534 [sshd-SshClient[495083a0]-nio2-thread-6|] DEBUG
> org.apache.sshd.client.session.ClientUserAuthService [] -
> tryNext(ClientSessionImpl[[email protected]/192.168.188.250:22]) no
> initial request sent by method=password {code}
> I've attached a Maven project that contains an almost-self-contained unit
> test that showcases the behaviour. For the test to work you'll need
> - to have some SSH server up & running
> - put the test's SSH public key (from src/test/resources/test_ssh_key.pub)
> into an authorized_keys file on the server
> - Adjust the test source code to use the right server name and user name (I
> used root)
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