[Bug 3481] PAM_TEXT_INFO messages are shown twice if they are the last conversation

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3481

--- Comment #1 from Martin <bugs at mrvanes.com> ---
Created attachment 3677
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3677&action=edit
Minimal test case

Attached is a minimal test case that shows the observed behaviour in
all it's glory. It includes the tty_output() in the same we include it
in our module.

It was compiled on ubuntu 22.10 using:
$ gcc pam_test.c -shared -o pam_test.so -lpam

copied to /usr/local/lib/security
$ sudo cp pam_test.so /usr/local/lib/security/pam_test.so

activated as a pam module in /etc/pam.d/sshd just above common-account
...
auth required /usr/local/lib/security/pam_test.so
# Standard Un*x authorization.
@include common-account

tested using pamtester:
$ pamtester sshd martin authenticate
Password: 
Info
pamtester: successfully authenticated

tested using sshd:
$ ssh localhost
(martin at localhost) Password: 
Info
Info
Welcome to Ubuntu 22.10 (GNU/Linux 6.1.11 x86_64)

Which clearly shows the double output of the last (and only)
PAM_TEXT_INFO message.

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