While the iptables thing I posted (1 rcon/second) works fine, if you instead want to do a whitelist like this in linux as well:
iptables -A INPUT -p tcp --dport 27015 --source 123.123.12.3 -j ACCEPT iptables -A INPUT -p tcp --dport 27015 --source 115.53.3.22 -j ACCEPT [... repeat for as many IPs as you want to allow] iptables -A INPUT -p tcp --dport 27015 -j DROP you can also do iptables -A INPUT -p tcp --dport 27015 --source 123.123.12.3 -j ACCEPT iptables -A INPUT -p tcp --dport 27015 --source 115.53.3.22 -j ACCEPT [... repeat for as many IPs as you want to allow] iptables -A INPUT -p tcp --dport 27015 -m hashlimit --hashlimit-mode srcip,dstip,dstport --hashlimit 1/sec --hashlimit-burst 1 --hashlimit-name TF_PACKET_LIMIT -j ACCEPT iptables -A INPUT -p tcp --dport 27015 -j DROP Do combine both - a whitelist, then a 1rcon/second limit for non-whitelisted people. - Neph On Mon, Apr 28, 2008 at 11:45 PM, Tony Paloma <[EMAIL PROTECTED]> wrote: > So, I was able to make the IPSec thing work to allow certain IPs also. You > just set up a separate pass rule for the IPs you want to let in. Works fine. > I used it to block all RCON except for those sent from HLStatsX and myself. > > This line blocks all access to TCP port 27015: > ipseccmd.exe -w REG -p "Block TCP 27015 Filter" -r "Block Inbound TCP 27015 > > Rule" -f *=0:27015:TCP -n BLOCK -x > > Then use this line to allow those you trust at the rcon port (shown with > 216.40.218.146): > ipseccmd.exe -w REG -p "Block TCP 27015 Filter" -r "Allow TCP 27015 From > 216.40.218.146" -f 216.40.218.146=0:27015:TCP -n PASS -x > > I hope this helps someone. I've seen no adverse side effects to blocking TCP > 27015 except for blocking RCON. It seems that all game data goes to UDP > 27015. > > > -----Original Message----- > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] On Behalf Of Tony Paloma > Sent: Monday, April 28, 2008 10:43 PM > To: 'Half-Life dedicated Win32 server mailing list' > Subject: Re: [hlds] Nuke Exploit Info and Prevention > > You can block TCP/IP port 27015 on Windows Server using IPSec policies. > > IPSeccmd.exe -W REG -p "Block TCP 27015 Filter" -r "Block Inbound 27015 > Rule" -f *=0:27015:TCP -n BLOCK -x > > This will of course prevent RCON connections. Allowing certain IP addresses > is probably possible but I'm unsure of how to do it. > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Nephyrin Zey > Sent: Monday, April 28, 2008 10:26 PM > To: Half-Life dedicated Win32 server mailing list; Half-Life dedicated Linux > server mailing list > Subject: [hlds] Nuke Exploit Info and Prevention > > The nuke exploit works as follows: > > Connect to a server via TCP (rcon, does anything else use TCP? I have > no idea.) on its port. > Send a million garbage packets > ??? > Profit > > The server goes insane handling them. > Solution: > Limit incoming TCP packets to ~1/second from any given IP on that port, *OR* > Block TCP access to the server's port except from trusted people. > > Linux IPtables rules: > iptables -A INPUT -p tcp --dport 27015 -m hashlimit --hashlimit-mode > srcip,dstip,dstport --hashlimit 1/sec --hashlimit-burst 1 > --hashlimit-name TF_PACKET_LIMIT -j ACCEPT > iptables -A INPUT -p tcp --dport 27015 -j DROP > > /etc/init.d/iptables save > /etc/init.d/iptables start > > (Note: you probably shouldn't enable iptables blindly if you don't > know what you're doing) > > Windows: > Block TCP to 27015 except for trusted people. Or something. Someone > who admins window servers will need to guide you! > > - Neph > (sv_benchmark_force_start fix coming in a few minutes) > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > http://list.valvesoftware.com/mailman/listinfo/hlds > > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > http://list.valvesoftware.com/mailman/listinfo/hlds > > > _______________________________________________ > To unsubscribe, edit your list preferences, or view the list archives, > please visit: > http://list.valvesoftware.com/mailman/listinfo/hlds > _______________________________________________ To unsubscribe, edit your list preferences, or view the list archives, please visit: http://list.valvesoftware.com/mailman/listinfo/hlds
