roles/common: minor configuration of Debian 13 SSH

Tweak some of the new OpenSSH per-source penalty settings on Debian
13. For now only adjusting the source network masks and reusing the
list of IPs to exempt from fail2ban.

These being built in makes them easier to use, but I think I will
end up sticking with fail2ban for the heavy lifting because it per-
sists across restarts of the daemon, whereas OpenSSH's doesn't. I
will monitor OpenSSH on Debian 13 to see how to best use it along
side fail2ban.

roles/common/defaults/main.yml

@@ -8,7 +8,7 @@ fail2ban_maxretry: 6
 fail2ban_findtime: 3600
 # 2 weeks in seconds
 fail2ban_bantime: 1209600
-fail2ban_ignoreip: 127.0.0.1/8
+fail2ban_ignoreip: 127.0.0.0/8
 
 # Disable SSH passwords. Must use SSH keys. This is OK because we add the keys
 # before re-configuring the SSH daemon to disable passwords.

roles/common/templates/etc/ssh/sshd_config.d/01-Debian-13.conf.j2

@@ -32,3 +32,9 @@ KexAlgorithms mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha51
 {% if ssh_allowed_users is defined and ssh_allowed_users %}
 AllowUsers {{ ssh_allowed_users|join(" ") }} {{ provisioning_user.name }}
 {% endif %}
+
+PerSourcePenaltyExemptList {{ fail2ban_ignoreip | replace(" ", ",") }}
+
+# Mask to use for IPv4 and IPv6 respectively when applying network penalties.
+# The default is 32:128.
+PerSourceNetBlockSize 24:56