/usr/share/ipa/updates/20-sslciphers.update 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 4 5 6 | # change configured ciphers
# the result of this update will be that default ciphers
# provided by DS which are not weak will be enabled
dn: cn=encryption,cn=config
only:nsSSL3Ciphers: default
addifnew:allowWeakCipher: off
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