All Essential System Functionality Relies on the
Shadow Password Suite
Passwd and Group Files give
Permissions
FUSE
FileSystems in USEr Space
Linux Users are Assigned to at least one
Group
Regular Permissions
Read, Write, and Execute
SUID
Set User ID
SGID
Set Group ID
auth Module (PAM)
Authenticates Users via Verification
account Module (PAM)
Checks the Validity of an Account
password Module (PAM)
Controls Changes to Passwords and Login Attempts
session Module (PAM)
Session Management. Sends Information to System Logs
include Module (PAM)
Includes Configuration Directives from another File
LDAP and NIS are
Directory Services that use Authentication Databases
LDAP is more Secure, avoid
NIS