Added Linux-PAM and updated description.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

libs/libpam/files/pam.conf

@@ -0,0 +1,15 @@
+# ---------------------------------------------------------------------------#
+# /etc/pam.conf								     #
+# ---------------------------------------------------------------------------#
+#
+# NOTE
+# ----
+#
+# NOTE: Most program use a file under the /etc/pam.d/ directory to setup their
+# PAM service modules. This file is used only if that directory does not exist.
+# ---------------------------------------------------------------------------#
+
+# Format:
+# serv.	module	   ctrl	      module [path]	...[args..]		     #
+# name	type	   flag							     #
+

libs/libpam/files/pam.d/common-account

@@ -0,0 +1,20 @@
+#
+# /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.
+#
+
+# here are the per-package modules (the "Primary" block)
+account	[success=1 new_authtok_reqd=done default=ignore]	pam_unix.so 
+# here's the fallback if no module succeeds
+account	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+account	required			pam_permit.so
+# and here are more per-package modules (the "Additional" block)
+
+# end of pam-auth-update config

libs/libpam/files/pam.d/common-auth

@@ -0,0 +1,21 @@
+#
+# /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.
+#
+
+# here are the per-package modules (the "Primary" block)
+auth	[success=1 default=ignore]	pam_unix.so nullok_secure
+# here's the fallback if no module succeeds
+auth	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+auth	required			pam_permit.so
+# and here are more per-package modules (the "Additional" block)
+
+# end of pam-auth-update config

libs/libpam/files/pam.d/common-password

@@ -0,0 +1,28 @@
+#
+# /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 "sha512" option enables salted SHA512 passwords.  Without this option,
+# the default is Unix crypt.  Prior releases used the option "md5".
+#
+# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
+# login.defs.
+#
+# See the pam_unix manpage for other options.
+
+# here are the per-package modules (the "Primary" block)
+password	[success=1 default=ignore]	pam_unix.so obscure sha512
+# here's the fallback if no module succeeds
+password	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+password	required			pam_permit.so
+# and here are more per-package modules (the "Additional" block)
+
+# end of pam-auth-update config

libs/libpam/files/pam.d/common-session

@@ -0,0 +1,25 @@
+#
+# /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).
+#
+
+# here are the per-package modules (the "Primary" block)
+session	[default=1]			pam_permit.so
+# here's the fallback if no module succeeds
+session	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+session	required			pam_permit.so
+# The pam_umask module will set the umask according to the system default in
+# /etc/login.defs and user settings, solving the problem of different
+# umask settings with different shells, display managers, remote sessions etc.
+# See "man pam_umask".
+session optional			pam_umask.so
+# and here are more per-package modules (the "Additional" block)
+session	required			pam_unix.so 
+# end of pam-auth-update config

libs/libpam/files/pam.d/common-session-noninteractive

@@ -0,0 +1,25 @@
+#
+# /etc/pam.d/common-session-noninteractive - session-related modules
+# common to all non-interactive 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 all non-interactive sessions.
+#
+
+# here are the per-package modules (the "Primary" block)
+session	[default=1]			pam_permit.so
+# here's the fallback if no module succeeds
+session	requisite			pam_deny.so
+# prime the stack with a positive return value if there isn't one already;
+# this avoids us returning an error just because nothing sets a success code
+# since the modules above will each just jump around
+session	required			pam_permit.so
+# The pam_umask module will set the umask according to the system default in
+# /etc/login.defs and user settings, solving the problem of different
+# umask settings with different shells, display managers, remote sessions etc.
+# See "man pam_umask".
+session optional			pam_umask.so
+# and here are more per-package modules (the "Additional" block)
+session	required			pam_unix.so 
+# end of pam-auth-update config

libs/libpam/files/pam.d/other

@@ -0,0 +1,16 @@
+#
+# /etc/pam.d/other - specify the PAM fallback behaviour
+#
+# Note that this file is used for any unspecified service; for example
+#if /etc/pam.d/cron  specifies no session modules but cron calls
+#pam_open_session, the session module out of /etc/pam.d/other is
+#used.  If you really want nothing to happen then use pam_permit.so or
+#pam_deny.so as appropriate.
+
+# We fall back to the system default in /etc/pam.d/common-*
+# 
+
+auth       include      common-auth
+account    include      common-account
+password   include      common-password
+session    include      common-session