Linux Auditing

Hi.  I am using OSSEC and auditd to monitor file integrity on a Linux (CentOS) system.  I would, however, like to expand monitoring to include user events, such as logging in, logging out, running sudo, running chmod, and restarting and shutting down.  Is there any way--free or paid--to do this user auditing?  Thank you.
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madunix (Fadi SODAH)Chief Information Security Officer Commented:

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Just watch /var/log/secure for PAM events
auditing file systems permission change is heavy burden on filesystem (but auditd can do it)
What is the problem with chmod? Users are free to do what they want with their files.
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