/usr/share/sendmail/cf/feature/authinfo.m4 is in sendmail-cf 8.15.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2000-2002 Proofpoint, Inc. and its suppliers.
# All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
divert(0)
VERSIONID(`$Id: authinfo.m4,v 1.10 2013-11-22 20:51:11 ca Exp $')
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define(`_AUTHINFO_TABLE_', `')
LOCAL_CONFIG
# authinfo list database: contains info for authentication as client
Kauthinfo ifelse(defn(`_ARG_'), `', DATABASE_MAP_TYPE MAIL_SETTINGS_DIR`authinfo',
defn(`_ARG_'), `LDAP', `ldap -1 -v sendmailMTAMapValue,sendmailMTAMapSearch:FILTER:sendmailMTAMapObject,sendmailMTAMapURL:URL:sendmailMTAMapObject -k (&(objectClass=sendmailMTAMapObject)(|(sendmailMTACluster=${sendmailMTACluster})(sendmailMTAHost=$j))(sendmailMTAMapName=authinfo)(sendmailMTAKey=%0))',
`_ARG_')
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