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60 lines
2.3 KiB
Markdown
60 lines
2.3 KiB
Markdown
---
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layout: post
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comments: true
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title: "My ufw (Ubuntu/Uncomplicated Firewall) config"
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category: [english]
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tags: [english]
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redirect_from: /ufw/
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---
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*This post describes my UFW config and is here so I find it from somewhere
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and with hope that I am told if someone notices something terriby insecure
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here and is able to offer suggestions.*
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Having firewall is important as you aren't always in your trusted home
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network and with IPv6 your devices have public IPv6 addresses.
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This post first has list of commands, then explanations.
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```
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ufw limit 22/tcp
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ufw default deny incoming
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ufw default allow outgoing
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systemctl enable ufw && systemctl start ufw
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ufw enable
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ufw reject 113/tcp
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ufw allow from 172.16.0.0/16 to any port 631
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ufw allow from 172.16.0.0/16 to any port 5353 proto udp
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ufw allow from 173.16.0.0/16 to any port 9091 proto tcp
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ufw allow from 172.16.0.0/16 to any port 17500 proto tcp
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ufw allow 60000:61000/udp
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```
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* 22 TCP/ssh — Prevent more than 6 connections in 30 seconds to the SSH
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port and it's the first command as you don't want to lock yourself out of
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and it's the first command as you don't want to lock yourself out of
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* Deny incoming connections unless the port has been whitelisted.
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* Allow all outgoing connections, keeping list of authorized ports would be
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too much for me.
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* Start ufw on boot and now (I am not sure if this step is required, but
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better safe than sorry).
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* Put the firewall in force.
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* 113 TCP/ident — Tell "Connection refused" to whoever tries to reach port
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113. This makes ident checking IRC servers connect faster as they don't
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have to timeout. If you run shell server (for IRC purpouses) you should
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allow this instead.
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* 631 both/cups — Allow access to cups for printer sharing from local
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network
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* 5353 UDP/mdns/Avahi — used for `.local` addresses and probably not needed
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outside local network
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* 9091 TCP/transmission web interface — also something I want to access
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from LAN. This seems risky too, but risks can be limited by only
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using this rule with static hosts.
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* Transmission file transfer uses TCP. Default port: 51413.
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* 17500 TCP/Dropbox LAN sync — which I use with desktops
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* 60000:61000 UDP/mosh — I feel this is the most insecure part of this
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setup and there should be something bettter instead of this.
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*If some host doesn't run some of the mentioned service, it's not open in
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the firewall.*
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