Re: [tor-relays] DDOS mitigation with nftables

[Chris Enkidu-6 <tor@xxxxxxxxxxxxxxx>]

With Ubuntu, installing ipset automatically installs iptables along with it. As others mentioned, modern Debian doesn't do that. I've modified the script to do that as well in the new version (v7.0.5).

As it is, you neither have iptables nor nftables and since you don't want to install them at all, then there's no point in running the script. As it's clearly stated in the README file of the repository, my script uses iptables-nft to accomplish the task of mitigating the attacks and it's not something you can accomplish using firewalld or UFW, at least not to that extent. The goal of those firewalls is to simplify the rules for people who don't want to deal with complexities of iptables/nftables and in doing so, they do not offer the more complex features that iptables-nft provides.

Regards,

Enkidu

On 10/23/2024 4:40 AM, Top wrote:

> Hi,
>       
>       
>       thanks for the replies! I'm gonna answer a few questions.
>       
>       Regarding Enkidu:
>       
>       - I use Debian
>       
>       - `iptables -V` says `-bash: iptables: command not found`
>       
>       - `ipset -v` says `ipset v7.17, protocol version: 7`
>       
>       - I'm running Debian but the installation of `ipset` did not
>       install `iptables`
>       
>       - I am running the script with root
>       
>       - Besides, I don't *want* to use `iptables` and `nftables` - so I
>       don't even want `iptables` to be installed
>       
>       
>       Regarding boldsuck:
>       
>       Thanks for the information!
>       
>       I might try to adapt your example to my situation.
>       
>       I do not have an exit but two guards.
>       
>       
>       Regarding Ralph:
>       
>       - The logs basically keep repeating that `iptables` could not be
>       found. For example:
>       
>       ```
>       
>       ./rules.sh: line 3: iptables-save: command not found
>       
>       ./rules.sh: line 4: ip6tables-save: command not found
>       
>       ./rules.sh: line 6: iptables: command not found
>       
>       ./rules.sh: line 7: ip6tables: command not found
>       
>       ```
>       
>       - I don't think my PATH is my problem, since I really don't have
>       (nor want) `iptables` installed
>       
>       - I can't lock myself out since I can always access the server
>       directly without `ssh`. Thanks for the warning though
>       
>       
>       Regarding tor-relays+tor-relays:
>       
>       - Interesting that anti-DDoS is now integrated!
>       
>       - The `iptables-nft` package does not exist on my machine since I
>       run Debian
>       
>       
>       Kind regards
>       
>       Top
>       
>       
>       On 23/10/2024 04:49, tor-relays+tor-relays@xxxxxxxxx wrote:
>       
> >         
> >         
> >         On 22/10/24 14:24, Top wrote:
> >         
> > > Hi all,
> > >           
> > >           
> > >           
> > >           My tor relays[1] traffic decreased a lot and I think this
> > >           *might* be connected to some kind of DDOS attack.
> > >           
> > >           So I wanted to use this situation to set up some DDOS
> > >           protection.
> > >           
> > >           For that I stumbled upon Enkidus tor DDOS mitigation script.
> > >           [2]
> > >           
> > >         
> >         
> >         I believe that the mitigations found in the community-maintained
> >         anti-DDoS scripts, such as limiting the number of open
> >         connections from a single IP, are now integrated into tor
> >         itself.
> >         
> >         
> > > However, this script is made for
> > >           `iptables`, not `nftables`.
> > >           
> > >           I use `firewalld` with `nftables` on my system, since this
> > >           seems to be the new default. [3]
> > >           
> > >           I don't really know that much about firewalls, so this
> > >           situation overwhelms me a bit.
> > >           
> > >           In the README of Enkidus rules it says:
> > >           
> > >           
> > >            > Practically all linux systems come with iptables or more
> > >           recently with  nftables which basically does the same and
> > >           more. So you won't need to install iptables. Just type
> > >           iptables -V . If you see a version, you have it. The same with
> > >           ipset . An ipset -v will do the job. In some rare cases you
> > >           may not have ipset installed and installing it is as simple as
> > >           apt-get ipset or yum install ipset or...
> > >           
> > >         
> >         
> >         You may want to consider installing the iptables-nft package,
> >         which offers a compatibility layer for iptables on
> >         Fedora/CentOS.
> >         
> >         
> > >           
> > >           This seems to imply that the script should work fine with
> > >           `nftables` as well.
> > >           
> > >           This is also what Enkidu seems to state in a relevant gitlab
> > >           issue: [4]
> > >           
> > >           
> > >            > nftables interprets all the iptables rules just fine so
> > >           the provided scripts will work regardless of which one you
> > >           have.
> > >           
> > >           
> > >           But it's not true!
> > >           
> > >           The script failed on my server, complaining that the
> > >           `iptables` command couldn't be found (and no rules had been
> > >           applied).
> > >           
> > >           
> > >           So how can I apply proper DDOS protection firewall rules
> > >           whilst using `nftables`?
> > >           
> > >           Is there some easy way to modify the script to make it work?
> > >           
> > >           
> > >           
> > >           Kind regards
> > >           
> > >           Top
> > >           
> > >           
> > >           
> > >           [1]: https://metrics.torproject.org/rs.html#search/toptor
> > >           
> > >           [2]: https://github.com/Enkidu-6/tor-ddos
> > >           
> > >           [3]: https://wiki.debian.org/nftables
> > >           
> > >           [4]:
> > >           https://gitlab.torproject.org/tpo/community/support/-/issues/40093
> > >           
> > >           _______________________________________________
> > >           
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> > >           
> > >           tor-relays@xxxxxxxxxxxxxxxxxxxx
> > >           
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> > >           
> > >         
> >         
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