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ignore local network multicast device discovery

This commit is contained in:
Asif Bacchus 2019-05-20 12:03:46 -06:00
parent 4a7deefe0c
commit d0961917b1
1 changed files with 21 additions and 1 deletions
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22
etc/fail2ban/filter.d/ufw-probe.conf
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@ -1,3 +1,23 @@
[Definition]
failregex = .*\[UFW BLOCK\] IN=.* SRC=<HOST>
ignoreregex =
# ignore common multicast device discovery calls on LOCAL IPv4/IPv6 networks
# still ban non-local (WAN) calls to any associated ports
ignoreregex = SRC=(10\.|172\.1[6-9]\.|172\.2[0-9]\.|172\.3[0-1]\.|192\.168\.|fe\w*\:).* PROTO=UDP.* DPT=(1900|3702|5353|5355) LEN=\d*\s\s$
# NOTES:
# IPv6 link local is fe80::/10 (fe80::-febf:ffff...ffff), so only 'fe' will
# always match
# IPv4 private ranges are:
# 10.0.0.0/8 (10.0.0.0-10.255.255.255)
# 172.16.0.0/12 (172.16.0.0-172.31.255.255)
# 192.168.0.0/16 (192.168.0.0-192.168.255.255)
# Multicast calls are done over UDP Ports. Common ports:
# 1900 = SSDP (dlna devices, chromecast, most UPnP devices)
# 3702 = WSD (printers mostly)
# 5353 = multicast DNS (mDNS)
# 5355 = link-local multicast name resolution (LLMNR)
# Excluding these ports on the LAN prevents unwanted bans without having to
# ignore all LAN addresses in their entirety since compromised LAN systems are
# still a very common attack vector.