On Pá, 2014-12-19 at 09:06 +0000, Minal Patil wrote: > Hello Sir/Madam, > I am working on a PAM authentication module where i am seeing delay in pam_authenticate when called in sucessive manner.Below is my PAM function call sequence. > pam_start() > ... > 1. pam_authenticate() > 2. pam_authenticate() > 3. pam_authenticate() > > 4. pam_authenticate() > > .... > > 1000.pam_authenticate() > .... > pam_end() > > It is observed that the first pam_authenticate responds with 40 ms. The response time goes up with every subsequent pam_authenticate call. for 1000 the call the response time is observed to be 2 seconds. > > Below are my system details: > > [myuser@myhost workdir]$ ls -l /lib/libpam* > lrwxrwxrwx. 1 root root 17 Oct 18 2013 /lib/libpamc.so.0 -> libpamc.so.0.82.1 > -rwxr-xr-x. 1 root root 13764 Oct 15 2012 /lib/libpamc.so.0.82.1 > lrwxrwxrwx. 1 root root 21 Oct 18 2013 /lib/libpam_misc.so.0 -> libpam_misc.so.0.82.0 > -rwxr-xr-x. 1 root root 11460 Oct 15 2012 /lib/libpam_misc.so.0.82.0 > lrwxrwxrwx. 1 root root 16 Oct 18 2013 /lib/libpam.so.0 -> libpam.so.0.82.2 > -rwxr-xr-x. 1 root root 52540 Oct 15 2012 /lib/libpam.so.0.82.2 > [myuser@myhost workdir]$ uname -a > Linux myhost 2.6.32-358.18.1.el6.i686 #1 SMP Fri Aug 2 17:10:27 EDT 2013 i686 i686 i386 GNU/Linux > [myuser@myhost workdir]$ cat /etc/redhat-release > Red Hat Enterprise Linux Server release 6.4 (Santiago) > > I have observed the same behavior on RHEL 6.2 as well. > https://www.redhat.com/mailman/listinfo/pam-list Which PAM modules do you have configured in the PAM stack? Do you observe the same behavior even with PAM stack containing a single: auth required pam_permit.so If not, you have to find out which PAM module causes the delay although I suppose this can be multiple modules as PAM stack was not designed to operate this way. You should always call pam_start() pam_authenticate() and pam_end(). -- Tomas Mraz No matter how far down the wrong road you've gone, turn back. Turkish proverb (You'll never know whether the road is wrong though.) _______________________________________________ Pam-list mailing list Pam-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/pam-list
