A set of bash scripts used to apply iptables rules to fight the current
DDoS attacks. They require no dependencies to install except
iptable/nftables which all Linux flavors already have and require no
particular expertise. The issue was discussed here:
Some modifications due to a change in the nature of the attacks.
- Re ordered rules for more efficiency and reducing the load
- Removed the hashlimit rule as it puts more load on the system with not
much overall benefit as the attackers have adapted to it and it reduces
the size of the block list.
- Reduce the number of allowed concurrent connections to 2 if you're not
a relay.
- Use of remove.sh cron script at regular intervals (optional) will give
relays a chance to create up to 4 connections if they need to.
******- Created a new cron file **refresh-authorities.sh** to refresh
your allow-list with the most up to date IP addresses for the
authorities and snowflake. Should be run daily.
- Removed an unnecessary line in the update files.
- Modified Readme.MD file to reflect new changes.
The new modifications have been tested for two weeks now and the systems
are running smoothly with no ill effect.
To avoid occasional NTor drops a minimum NumCPUs 16 in torrc is recommended.
P.S.
The NumCPUs option is unfortunately poorly documented. It really has
nothing to do with the number of CPUs you have. It's about the number of
worker threads Tor will create to deal with decryption of onionskins. So
you can have two CPUs and still set NumCPUs to 16.
Not at all. That's how I'm running my own relays. Just run the
**combined.sh** on each individual VM and you'll be fine.
As for the ORPort, yes, I agree. There are ways to read the torrc file
and set the ORPort automatically. I will incorporate that into the
scripts in future versions. My original intention was to put something
simple together with minimum complexity that anyone with little or no
expertise can understand and modify if necessary without breaking the code.
I've also set up a [Discussion
Board](Enkidu-6/tor-ddos · Discussions · GitHub) for the
repository on github in case you have any questions, suggestions or
simply need further help.
···
On 12/1/2022 11:57 AM, Anders Trier Olesen wrote:
Hi Chris
We run all the 12 dotsrc relays on a single host with many IP
addresses. Would we need to change anything?
Btw, you can make the scripts find the all the OR ports by running
something like ‘ss -pl | grep tor’.
- Anders
tor. 1. dec. 2022 kl. 09.02 skrev Chris <tor@wcbsecurity.com
<mailto:tor@wcbsecurity.com>>:
Background:
A set of bash scripts used to apply iptables rules to fight the
current
DDoS attacks. They require no dependencies to install except
iptable/nftables which all Linux flavors already have and require no
particular expertise. The issue was discussed here:
Some modifications due to a change in the nature of the attacks.
- Re ordered rules for more efficiency and reducing the load
- Removed the hashlimit rule as it puts more load on the system
with not
much overall benefit as the attackers have adapted to it and it
reduces
the size of the block list.
- Reduce the number of allowed concurrent connections to 2 if
you're not
a relay.
- Use of remove.sh cron script at regular intervals (optional)
will give
relays a chance to create up to 4 connections if they need to.
******- Created a new cron file **refresh-authorities.sh** to refresh
your allow-list with the most up to date IP addresses for the
authorities and snowflake. Should be run daily.
- Removed an unnecessary line in the update files.
- Modified Readme.MD file to reflect new changes.
The new modifications have been tested for two weeks now and the
systems
are running smoothly with no ill effect.
To avoid occasional NTor drops a minimum NumCPUs 16 in torrc is
recommended.
P.S.
The NumCPUs option is unfortunately poorly documented. It really has
nothing to do with the number of CPUs you have. It's about the
number of
worker threads Tor will create to deal with decryption of
onionskins. So
you can have two CPUs and still set NumCPUs to 16.
_______________________________________________
tor-relays mailing list
tor-relays@lists.torproject.org
<mailto:tor-relays@lists.torproject.org> tor-relays Info Page
Transport Total IP IPv6
RAW 1 0 1
UDP 247 193 54
TCP 139561 125849 13712
INET 139809 126042 13767
FRAG 0 0 0
It would be really nice if you could update the scripts to support this kind of setup! And maybe also consider using plain nftables instead of relying on the legacy iptables compatibility layer
Not at all. That’s how I’m running my own relays. Just run the combined.sh on each individual VM and you’ll be fine.
As for the ORPort, yes, I agree. There are ways to read the torrc file
and set the ORPort automatically. I will incorporate that into the
scripts in future versions. My original intention was to put something
simple together with minimum complexity that anyone with little or no
expertise can understand and modify if necessary without breaking the code.
I’ve also set up a Discussion
Board for the
repository on github in case you have any questions, suggestions or
simply need further help.
On 12/1/2022 11:57 AM, Anders Trier Olesen wrote:
Hi Chris
We run all the 12 dotsrc relays on a single host with many IP
addresses. Would we need to change anything?
Btw, you can make the scripts find the all the OR ports by running
something like ‘ss -pl | grep tor’.
A set of bash scripts used to apply iptables rules to fight the
current
DDoS attacks. They require no dependencies to install except
iptable/nftables which all Linux flavors already have and require no
particular expertise. The issue was discussed here:
Some modifications due to a change in the nature of the attacks.
Re ordered rules for more efficiency and reducing the load
Removed the hashlimit rule as it puts more load on the system
with not
much overall benefit as the attackers have adapted to it and it
reduces
the size of the block list.
Reduce the number of allowed concurrent connections to 2 if
you’re not
a relay.
Use of remove.sh cron script at regular intervals (optional)
will give
relays a chance to create up to 4 connections if they need to.
******- Created a new cron file refresh-authorities.sh to refresh
your allow-list with the most up to date IP addresses for the
authorities and snowflake. Should be run daily.
Removed an unnecessary line in the update files.
Modified Readme.MD file to reflect new changes.
The new modifications have been tested for two weeks now and the
systems
are running smoothly with no ill effect.
To avoid occasional NTor drops a minimum NumCPUs 16 in torrc is
recommended.
P.S.
The NumCPUs option is unfortunately poorly documented. It really has
nothing to do with the number of CPUs you have. It’s about the
number of
worker threads Tor will create to deal with decryption of
onionskins. So
you can have two CPUs and still set NumCPUs to 16.
I put together a script that will apply the rules to two addresses at a
time. I suggest that you run it for two of your relays and see if it
helps. If it does, all you have to do is change the IP Addresses and run
the script again until all your addresses are covered. It won't conflict
with the other rules.
And if it doesn't do what you're looking for, the script makes a back up
of your existing iptables rules. All you have to do is restore it and
everything goes back to how it was without having to reboot. You should
save that backup somewhere else as the second time you run the script,
the original back up will be overwritten.
Transport Total IP IPv6
RAW 1 0 1
UDP 247 193 54
TCP 139561 125849 13712
INET 139809 126042 13767
FRAG 0 0 0
It would be really nice if you could update the scripts to support
this kind of setup! And maybe also consider using plain nftables
instead of relying on the legacy iptables compatibility layer
Best regards
Anders
On Thu, Dec 1, 2022 at 6:42 PM Chris <tor@wcbsecurity.com > <mailto:tor@wcbsecurity.com>> wrote:
Hi Andres,
Not at all. That's how I'm running my own relays. Just run the
**combined.sh** on each individual VM and you'll be fine.
As for the ORPort, yes, I agree. There are ways to read the torrc file
and set the ORPort automatically. I will incorporate that into the
scripts in future versions. My original intention was to put something
simple together with minimum complexity that anyone with little or no
expertise can understand and modify if necessary without breaking
the code.
I've also set up a [Discussion
Board](Enkidu-6/tor-ddos · Discussions · GitHub) for the
repository on github in case you have any questions, suggestions or
simply need further help.
On 12/1/2022 11:57 AM, Anders Trier Olesen wrote:
> Hi Chris
>
> We run all the 12 dotsrc relays on a single host with many IP
> addresses. Would we need to change anything?
>
> Btw, you can make the scripts find the all the OR ports by running
> something like ‘ss -pl | grep tor’.
>
> - Anders
>
> tor. 1. dec. 2022 kl. 09.02 skrev Chris <tor@wcbsecurity.com
<mailto:tor@wcbsecurity.com>
> <mailto:tor@wcbsecurity.com>>:
>
> Background:
>
> A set of bash scripts used to apply iptables rules to fight the
> current
> DDoS attacks. They require no dependencies to install except
> iptable/nftables which all Linux flavors already have and
require no
> particular expertise. The issue was discussed here:
>
> [issue
>
40093](Provide a recommended set of iptables/nftables rules to help in case of DoS attacks (#40093) · Issues · The Tor Project / Community / Support · GitLab)
>
> Change log:
>
> Some modifications due to a change in the nature of the attacks.
>
> - Re ordered rules for more efficiency and reducing the load
> - Removed the hashlimit rule as it puts more load on the system
> with not
> much overall benefit as the attackers have adapted to it and it
> reduces
> the size of the block list.
> - Reduce the number of allowed concurrent connections to 2 if
> you're not
> a relay.
> - Use of remove.sh cron script at regular intervals (optional)
> will give
> relays a chance to create up to 4 connections if they need to.
> ******- Created a new cron file **refresh-authorities.sh**
to refresh
> your allow-list with the most up to date IP addresses for the
> authorities and snowflake. Should be run daily.
> - Removed an unnecessary line in the update files.
> - Modified Readme.MD file to reflect new changes.
>
> The new modifications have been tested for two weeks now and the
> systems
> are running smoothly with no ill effect.
>
> You can read more and download here:
>
> [Enkidu-6 tor-ddos on
Github](GitHub - Enkidu-6/tor-ddos: iptables rules for Tor relay operators to mitigate ddos)
>
> To avoid occasional NTor drops a minimum NumCPUs 16 in torrc is
> recommended.
>
> P.S.
> The NumCPUs option is unfortunately poorly documented. It
really has
> nothing to do with the number of CPUs you have. It's about the
> number of
> worker threads Tor will create to deal with decryption of
> onionskins. So
> you can have two CPUs and still set NumCPUs to 16.
>
>
> _______________________________________________
> tor-relays mailing list
> tor-relays@lists.torproject.org
<mailto:tor-relays@lists.torproject.org>
> <mailto:tor-relays@lists.torproject.org
<mailto:tor-relays@lists.torproject.org>>
> tor-relays Info Page
>
