disable the debian/ubuntu package version from being sent to clients
dkg pointed out to riseup that our ssh servers were revealing the package version to clients, which is controlled by the DebianBanner config option. It exists in both Debian and Ubuntu and defaults to 'yes', so we explicitly set it to 'no' in the templates for those distros.
See merge request !17
both squeeze (1:5.5p1-6+squeeze6) and wheezy (1:6.0p1-4+deb7u2) have MACs better than hmac-sha1 available in the default search, they both have hmac-sha2-512, hmac-sha2-256, and hmac-ripemd160. So switch to using hmac-sha2-512, which lets us lock down the client MACs more.
types you want to support in your sshd_config.
We use the ssh_version fact to determine the default hostkey types.
Only enable rsa and ed25519 for ssh versions greater or equal
to 6.5, otherwise enable rsa and dsa.
Some distributions, such as debian, also enable ecdsa as a hostkey
type, but this is a known bad NIST curve, so we do not enable that
by default (thus deviating from the stock sshd config)
Conflicts:
templates/sshd_config/Debian_squeeze.erb
I always picked the shared repository version when conflicts arose.
The only exception to this rule was:
I kept my branch's "HostbasedUsesNameFromPacketOnly yes" in order
to be consistent with existing Etch and Lenny templates.
This is not the default Debian setting, but I would find it weird if a host
had this setting changed by Puppet after upgrading to Squeeze.
The right way to proceed would probably be to make this configurable.
