On 09.02.20 12:25, Dr Josef Karthauser wrote:
Hi Folks,
Has anyone got any experience with PAM and pthreads?
We’re using a 2FA module (pam_yubico
https://www.freebsd.org/cgi/man.cgi?query=pam_yubico&sektion=8
<https://www.freebsd.org/cgi/man.cgi?query=pam_yubico&sektion=8>).
It’s proving unreliable. Digging deeper it uses libcurl to communication to an
HTTP endpoint, and libcurl is using pthreads for to make asynchronous DNS
lookup requests.
It seems that the pthreads are not being handled reliably within the PAM
runtime context - the background threads do not complete or dispatch. It’s very
strange.
The problem doesn’t happen if we use the same code running from a user land
process. The pthreads are reliably in this context.
Is there a known issue with PAM and pthreads? Hints are that there are
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214540
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214540>). But that problem
was reported 3 years ago!
HELP!
If you know something I’d really appreciate a steer!
Is the "host" process multithreaded or at least built with Pthread support?
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