Using PAM to log password changes?

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04-21-2010

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Using PAM to log password changes?

Hi, on a lab computer another user (who is a sudoer) changed my password without my permission. I'm pretty positive it was her, though I can't conclusively prove it. I had my friend, who is another sudoer on the machine, fix it and make me a sudoer now too.

So everything is fine, but I want solid proof in case this happens again. I know I can see when people have been logged in with the command 'last', but I would need to correlate that to the actual password change time. So I'd like to have the system log whenever someone (eg, her) sudo's to change another user's (eg, mine) password.

I was told I can do this with PAM, but I looked at the documentation and it seemed to be mostly more about authentication and stuff, and I couldn't figure out how to log it. Can anyone help me?

Thanks!

PS: also, I'm aware that there's nothing I can do to prevent this happening again as long as she has root access. But I want proof in case it happens again. And I'm not trying to do anything to her, I'm just trying to protect myself and log password changes to MY account.

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LEARN ABOUT ULTRIX

pam_ldap

pam_ldap(8)						      System Manager's Manual						       pam_ldap(8)

NAME

       pam_ldap - PAM module for LDAP-based authentication

SYNOPSIS

       pam_ldap.so [...]

DESCRIPTION

       This is a PAM module that uses an LDAP server to verify user access rights and credentials.

OPTIONS

       use_first_pass
	      Specifies that the PAM module should use the first password provided in the authentication stack and not prompt the user for a pass-
	      word.

       try_first_pass
	      Specifies that the PAM module should use the first password provided in the authentication stack and if that fails prompt  the  user
	      for a password.

       nullok Specifying this option allows users to log in with a blank password.  Normally logins without a password are denied.

       ignore_unknown_user
	      Specifies  that  the  PAM module should return PAM_IGNORE for users that are not present in the LDAP directory.  This causes the PAM
	      framework to ignore this module.

       ignore_authinfo_unavail
	      Specifies that the PAM module should return PAM_IGNORE if it cannot contact the LDAP server.  This causes the PAM framework  to  ig-
	      nore this module.

       no_warn
	      Specifies that warning messages should not be propagated to the PAM application.

       use_authtok
	      This  causes the PAM module to use the earlier provided password when changing the password. The module will not prompt the user for
	      a new password (it is analogous to use_first_pass).

       debug  This option causes the PAM module to log debugging information to syslog(3).

       minimum_uid=UID
	      This option causes the PAM module to ignore the user if the user id is lower than the specified value. This can be  used	to  bypass
	      LDAP checks for system users (e.g. by setting it to 1000).

MODULE SERVICES PROVIDED

       All services are provided by this module but currently sessions changes are not implemented in the nslcd daemon.

FILES

       /etc/pam.conf
	      the main PAM configuration file

       /etc/nslcd.conf
	      The configuration file for the nslcd daemon (see nslcd.conf(5))

SEE ALSO

       pam.conf(5), nslcd(8), nslcd.conf(5)

AUTHOR

       This manual was written by Arthur de Jong <arthur@arthurdejong.org>.

Version 0.8.10							     Jun 2012							       pam_ldap(8)