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D3265.diff
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diff --git a/roles/core/sshd/files/sshd_config b/roles/core/sshd/files/sshd_config
--- a/roles/core/sshd/files/sshd_config
+++ b/roles/core/sshd/files/sshd_config
@@ -19,6 +19,13 @@
ListenAddress localhost
{%- endif %}
+# Terrapin mitigation
+# Those ciphers are fine if *BOTH* SSH client and server are patched.
+# A up-to-date OpenSSH server isn't enough if the client don't support
+# strict key exchange. As such, we still disable them.
+Ciphers -chacha20-poly1305@openssh.com
+MACs -*etm@openssh.com
+
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile .ssh/authorized_keys
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D3265: Disable Terrapin sensible ciphers and algorithms
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