- fix za bug koji je uocio Ljubomir sa dashem kao shellom

[iptables-cn.git] / debian / postinst

diff --git a/debian/postinst b/debian/postinst
index 0fe9d74..4ac4576 100755 (executable)
--- a/debian/postinst
+++ b/debian/postinst
@@ -41,17 +41,34 @@ if [ -e /etc/default/iptables ]; then
     mv /etc/default/iptables /etc/default/iptables-cn
 fi
 
-# check if there is any default netfilter policy and install default SSH
-# REJECT recent if there is none..
-# also, save current set of rules into active and inactive configuration
-if [ ! -e /var/lib/iptables/active ]; then
-    if ! iptables-save | grep '^-' >/dev/null; then
-        echo "CN: Netfilter rules empty: importing SSH bruteforce rules"
-        /usr/share/doc/iptables-cn/examples/ssh-bruteforce \
-            1>/dev/null 2>&1 || true
-    fi
+# check to see if fail2ban is installed
+if dpkg -l fail2ban | grep -q '^.i'; then
+    echo "CN: Detected Fail2Ban installation, will remove SSH bruteforce rules by default"
+    iptables -D SSH_Brute_Force -m recent ! --rcheck --seconds 90 \
+        --hitcount 3 --name SSH --rsource \
+        -j RETURN >/dev/null 2>&1 || true
+    iptables -D SSH_Brute_Force -p tcp -j REJECT \
+        --reject-with icmp-port-unreachable >/dev/null 2>&1 || true
+    iptables -D INPUT -p tcp -m tcp --dport 22 -m state \
+        --state NEW -m recent --set --name SSH --rsource \
+        -j SSH_Brute_Force >/dev/null 2>&1 || true
+    iptables -X SSH_Brute_Force >/dev/null 2>&1 || true
+
     echo "CN: Saving current Netfilter rules to /var/lib/iptables/active"
     iptables-save > /var/lib/iptables/active
+else
+    # check if there is any default netfilter policy and install default SSH
+    # REJECT recent if there is none..
+    # also, save current set of rules into active and inactive configuration
+    if [ ! -e /var/lib/iptables/active ]; then
+        if ! iptables-save | grep '^-' >/dev/null; then
+            echo "CN: Netfilter rules empty: importing SSH bruteforce rules"
+            /usr/share/doc/iptables-cn/examples/ssh-bruteforce \
+                1>/dev/null 2>&1 || true
+        fi
+        echo "CN: Saving current Netfilter rules to /var/lib/iptables/active"
+        iptables-save > /var/lib/iptables/active
+    fi
 fi
 
 # create inactive