/etc/prelude/default/tls.conf is in libprelude2 1.0.0-11ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Default size of the client/server generated private key
#
generated-key-size = 2048
#
# Number of days the authority certificates (server side) will
# remain valid. Theses certificate are only used in order to
# sign client certificate.
#
# Use 0 for the maximum possible value.
#
authority-certificate-lifetime = 0
#
# Number of days the generated certificates (client side) will
# remain valid. Theses certificate are only used in order to
# authenticate and encrypt client <-> server communication.
#
# Use 0 for the maximum possible value.
#
generated-certificate-lifetime = 0
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