/usr/share/ipa/61kerberos-ipav3.ldif is in freeipa-server 4.7.0~pre1+git20180411-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | dn: cn=schema
attributeTypes: (2.16.840.1.113730.3.8.11.32 NAME 'ipaKrbPrincipalAlias' DESC 'DEPRECATED - DO NOT USE' EQUALITY caseIgnoreMatch ORDERING caseIgnoreOrderingMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE X-ORIGIN 'IPA v3')
objectClasses: (2.16.840.1.113730.3.8.12.8 NAME 'ipaKrbPrincipal' SUP krbPrincipalAux AUXILIARY MUST ( krbPrincipalName $ ipaKrbPrincipalAlias ) X-ORIGIN 'IPA v3' )
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