Add sshguard

etc/sshguard/sshguard.conf

@@ -0,0 +1,25 @@
+#### REQUIRED CONFIGURATION ####
+# Full path to backend executable (required, no default)
+BACKEND="/usr/libexec/sshguard/sshg-fw-nft-sets"
+
+# Shell command that provides logs on standard output. (optional, no default)
+# Example 1: ssh and sendmail from systemd journal:
+LOGREADER="LANG=C journalctl -afb -p info -n1 -t sshd -o cat"
+
+#### OPTIONS ####
+# Block attackers when their cumulative attack score exceeds THRESHOLD.
+# Most attacks have a score of 10. (optional, default 30)
+THRESHOLD=20
+
+# Block attackers for initially BLOCK_TIME seconds after exceeding THRESHOLD.
+# Subsequent blocks increase by a factor of 1.5. (optional, default 120)
+BLOCK_TIME=180
+
+# Remember potential attackers for up to DETECTION_TIME seconds before
+# resetting their score. (optional, default 1800)
+DETECTION_TIME=3600
+
+# IP addresses listed in the WHITELIST_FILE are considered to be
+# friendlies and will never be blocked.
+WHITELIST_FILE=/etc/sshguard/whitelist
+BLACKLIST_FILE=80:/etc/sshguard/blacklist