This file is indexed.

/usr/lib/rds/secrets.ldiff is in rdsserver 1.1.0-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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dn: samAccountName=%USERNAME%,CN=Principals
msDS-KeyVersionNumber: 1
objectClass: top
objectClass: secret
objectClass: kerberosSecret
privateKeytab: rds.keytab
realm: %REALM%
sAMAccountName: %USERNAME%
secret: %SECRET%
servicePrincipalName: %USERNAME%/%REALM_LOWER%
servicePrincipalName: %USERNAME%/%FQDN%
name: dns-devserver