--- /dev/null
+#
+# /etc/pam.d/common-account - authorization settings common to all services
+#
+# This file is included from other service-specific PAM config files,
+# and should contain a list of the authorization modules that define
+# the central access policy for use on the system. The default is to
+# only deny service to users whose accounts are expired in /etc/shadow.
+#
+account required pam_unix.so
--- /dev/null
+#
+# /etc/pam.d/common-auth - authentication settings common to all services
+#
+# This file is included from other service-specific PAM config files,
+# and should contain a list of the authentication modules that define
+# the central authentication scheme for use on the system
+# (e.g., /etc/shadow, LDAP, Kerberos, etc.). The default is to use the
+# traditional Unix authentication mechanisms.
+#
+auth required pam_unix.so nullok_secure
--- /dev/null
+#
+# /etc/pam.d/common-password - password-related modules common to all services
+#
+# This file is included from other service-specific PAM config files,
+# and should contain a list of modules that define the services to be
+# used to change user passwords. The default is pam_unix.
+
+# Explanation of pam_unix options:
+#
+# The "nullok" option allows users to change an empty password, else
+# empty passwords are treated as locked accounts.
+#
+# The "md5" option enables MD5 passwords. Without this option, the
+# default is Unix crypt.
+#
+# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
+# login.defs.
+#
+# You can also use the "min" option to enforce the length of the new
+# password.
+#
+# See the pam_unix manpage for other options.
+
+password required pam_unix.so nullok obscure md5
+
+# Alternate strength checking for password. Note that this
+# requires the libpam-cracklib package to be installed.
+# You will need to comment out the password line above and
+# uncomment the next two in order to use this.
+# (Replaces the `OBSCURE_CHECKS_ENAB', `CRACKLIB_DICTPATH')
+#
+# password required pam_cracklib.so retry=3 minlen=6 difok=3
+# password required pam_unix.so use_authtok nullok md5
+
--- /dev/null
+#
+# /etc/pam.d/common-session - session-related modules common to all services
+#
+# This file is included from other service-specific PAM config files,
+# and should contain a list of modules that define tasks to be performed
+# at the start and end of sessions of *any* kind (both interactive and
+# non-interactive). The default is pam_unix.
+#
+session required pam_unix.so