On 09/01/2017 02:11 PM, William Gathoye wrote: > > > On 08/30/2017 12:19 AM, Leonid Isaev via arch-general wrote: >> >> man 8 pam_lastlog > For your kind info, calling pam_lastlog.so like described in the man > pages is segfaulting on my side. > > $ /usr/lib/security/pam_lastlog.so > Segmentation fault (core dumped) > > I cannot debug further since it hasn't been build with gdb debug > symbols, but this is likely to this issue. [1] > > > [1] https://www.redhat.com/archives/pam-list/2014-August/msg00003.html > You don't execute pam_lastlog.so directly. [root@centos7test pam.d]# pwd /etc/pam.d [root@centos7test pam.d]# cat login #%PAM-1.0 auth [user_unknown=ignore success=ok ignore=ignore default=bad] pam_securetty.so auth substack system-auth ***auth include postlogin account required pam_nologin.so account include system-auth password include system-auth # pam_selinux.so close should be the first session rule session required pam_selinux.so close session required pam_loginuid.so session optional pam_console.so # pam_selinux.so open should only be followed by sessions to be executed in the user context session required pam_selinux.so open session required pam_namespace.so session optional pam_keyinit.so force revoke session include system-auth ***session include postlogin -session optional pam_ck_connector.so (*** prefixed for emphasis. Do not actually put those in a pam config.) [root@centos7test pam.d]# cat postlogin #%PAM-1.0 # This file is auto-generated. # User changes will be destroyed the next time authconfig is run. session [success=1 default=ignore] pam_succeed_if.so service !~ gdm* service !~ su* quiet ***session [default=1] pam_lastlog.so nowtmp showfailed ***session optional pam_lastlog.so silent noupdate showfailed (*** prefixed for emphasis. Do not actually put those in a pam config.) As shown, pam is calling the pam_lastlog.so object (which is why you can't execute it; it's not an executable, it's a Shared Object). To do this over SSH, /etc/ssh/sshd_config has UsePam yes (and PrintLastLog yes is enabled by default) -- brent saner https://www.square-r00t.net
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