Rework source layout in preparation for modular sudo.

doc/sample.pam

@@ -0,0 +1,30 @@
+#%PAM-1.0
+# Sample /etc/pam.d/sudo file for RedHat 9 / Fedora Core.
+#   For other Linux distributions you may want to
+#   use /etc/pam.d/sshd or /etc/pam.d/su as a guide.
+#
+#   There are two basic ways to configure PAM, either via pam_stack
+#   or by explicitly specifying the various methods to use.
+#
+# Here we use pam_stack
+auth       required	pam_stack.so service=system-auth
+account    required	pam_stack.so service=system-auth
+password   required	pam_stack.so service=system-auth
+session    required	pam_stack.so service=system-auth
+#
+# Alternately, you can specify the authentication method directly.
+# Here we use pam_unix for normal password authentication.
+#auth       required	pam_env.so
+#auth       sufficient	pam_unix.so
+#account    required	pam_unix.so
+#password   required	pam_cracklib.so retry=3 type=
+#password   required	pam_unix.so nullok use_authtok md5 shadow
+#session    required	pam_limits.so
+#session    required	pam_unix.so
+#
+# Another option is to use SMB for authentication.
+#auth       required	pam_env.so
+#auth       sufficient	pam_smb_auth.so
+#account    required	pam_smb_auth.so
+#password   required	pam_smb_auth.so
+#session    required	pam_limits.so