Bug in partial key authentication?

[Jason Curl <jason@xxxxxxxxxxxxxxxxxxxxxxxx>]

Hello,

I'm working on using libssh on Windows with .NET. I've compiled master using
MSYS64 and it works quite well (based on the current HEAD on master).

I get a hang (in an arguably invalid situation), but as it's a hang and
blocks forever, I think the library should really check if it's in a valid
state and return an error instead of hanging for ever.

The pseudo code I'm doing is (it's in C# and would be too complicated
otherwise)
* ssh_pki_import_pubkey_file(filename, &pubkey) => returns success
* ssh_userauth_none(m_Session, null) => returns denied (expected)
* ssh_userauth_try_publickey(m_Session, null, publicKey) => returns SUCCESS

Now, normally I would have to call ssh_userauth_publickey(m_Session, null,
privateKey) and the program works as expected (it connects), but if I don't,
then:
* ssh_channel_new(m_Session) => Returns a valid channel handle. I'd expect
it to fail here instead of pass
* ssh_channel_open_session(m_Channel) => Blocks forever

If ssh_userauth_try_publickey returns denied, then the above also fails and
I get error codes as I'd expect. If I do the right thing and also call
ssh_userauth_publickey then it also does the right thing.

So I can ensure my code does the right thing, my question is, shouldn't the
above case not block anyway?

Thanks!
Jason.

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