/usr/share/doc/sudo/examples/pam.conf is in sudo 1.8.21p2-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 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
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