/etc/pam.d/chfn is in passwd 1:4.1.4.2+svn3283-3ubuntu5.
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 | #
# The PAM configuration file for the Shadow `chfn' service
#
# This allows root to change user infomation without being
# prompted for a password
auth sufficient pam_rootok.so
# The standard Unix authentication modules, used with
# NIS (man nsswitch) as well as normal /etc/passwd and
# /etc/shadow entries.
@include common-auth
@include common-account
@include common-session
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