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From "Thomas Wolf (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SSHD-850) sshd client; encrypted private key identity file: FilePasswordProvider called only once; should be called NumberOfPasswordPrompts times
Date Tue, 16 Oct 2018 20:46:00 GMT
Thomas Wolf created SSHD-850:
--------------------------------

             Summary: sshd client; encrypted private key identity file: FilePasswordProvider
called only once; should be called NumberOfPasswordPrompts times
                 Key: SSHD-850
                 URL: https://issues.apache.org/jira/browse/SSHD-850
             Project: MINA SSHD
          Issue Type: Improvement
    Affects Versions: 2.0.0
            Reporter: Thomas Wolf


In openssh, the ssh config entry NumberOfPasswordPrompts controls the number of times the
ssh client keeps asking for a password if the one entered was invalid in two cases:
 # keyboard-interactive authentication, and
 # asking for passwords for encrypted private keys in identity files in pubkey authentication
(see [openssh sources; sshconnect2.c|https://github.com/openssh/openssh-portable/blob/1a4a9cf/sshconnect2.c#L1380]).

sshd-core only has support for (1) through setting the property {{ClientAuthenticationManager.PASSWORD_PROMPTS}}
in the session's properties.

There doesn't seem to be any support for FilePasswordProvider to make it respect this value.

{{AbstractPEMResourceKeyPairParser.extractkeyPairs()}} and also {{BouncyCastleKeyPairResourceParser.loadKeyPair()}}
call {{FilePasswordProvider.getPassword()}} exactly once.

So how can I write a ssh client using sshd that asks the user NumberOfPasswordPrompts times?
Either I'm missing something, or there is some support for this missing in sshd.



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