[Bug 2876] PAM_TEXT_INFO and PAM_ERROR_MSG conversation not honoured during PAM authentication

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2876

--- Comment #8 from Damien Miller <djm at mindrot.org> ---
Created attachment 3160
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3160&action=edit
assign ERROR_MSG/TEXT_INFO messages to kbd-int information field

I think we can just assign these messages to *info - this ends up in
the instruction field in SSH_MSG_USERAUTH_INFO_REQUEST and being
printed by the client too.

This would mean we send SSH_MSG_USERAUTH_INFO_REQUEST messages to the
client with no prompts, but this is permitted by the protocol AFAIK and
our client at least seems to support it (though I bet there are others
that will choke...)

We don't really have a choice though - we can't tell a priori what the
next message from the PAM subprocess is going to be and it will block
for prompt messages.

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