Submitted 1 month ago by AustralianSimon@lemmy.world to selfhosted@lemmy.world
I’m running a website that is getting a lot of bot traffic and found Cloudflare free rule tier to be a bit limiting. (5 custom rules with length limits)
Ive got subnets for major VPS providers to block and will run analysis against my traffic to build on these lists.
What do others do?
I’m contemplating my Cloudflared tunnel into Crowdsec to my app.
FYI, IP access rules don’t count towards the 5 custom rules limit, but the more generous 50k limit.
With fail2ban, you can setup IP access rules via the cftoken-action quite easily.
Security --> WAF --> Tools to access the IP rules in the dashboard. developers.cloudflare.com/waf/…/ip-access-rules/
I have more than 50k but even that page doesn’t recommend it.
Top of that page
Recommendation: Use WAF custom rules instead
Cloudflare recommends that you create WAF custom rules instead of IP Access rules to perform IP-based or geography-based blocking (geoblocking):
WAF custom rules are more flexible, of course, and from a business perspective, I can understand why they would recommend that option instead.
I currently filter on an nginx access log file among other filters (sshd, bot-search, bad-requests) and let fail2ban execute the ban/unban action itself.
From a quick search, it should be possible to handle bans/unbans externally, if that’s what you’re after.
If you want to DIY something, I have a bash script that builds OpenResty with NAXSI from source. Most of the web apps I write anymore are actually in Lua, for OpenResty, maybe with an API written in something else. But I also help other members of my team deploy their Node and Python apps and stuff, and I always just park those behind OpenResty with NAXSI, just doing a standard nginx reverse proxy.
How easy is it to configure?
My goal is to download some lists from github and generate one big ban list to feed into the WAF but the community lists of Crowdsec might negate the need.
There’s a learning curve, but if you’re familiar with WAF’s it’s not hard.
Wafs don’t make you safer but create unnecessary attack surface. Just keep your machine and services up to date.
You will need to explain a bit further this statement to mild knowledged internet stranger…
Because the point of waf is exactly about reducing the exposed surface…
Xanza@lemm.ee 1 month ago
github.com/fail2ban/fail2ban
You can set
dbpurgeageto30dand pretty much just run it. It’s appeal is that you basically can download it, enable it, and it just works for you. It depends on your environment, though. If you have incoming authorized requests from other services it might be a pain to configure, but I’ve never used anything easier to protect you from bad actors.AustralianSimon@lemmy.world 1 month ago
I’ve used it on a machine before but given I am using a cloudflared container for ingress, can I route my traffic through a f2b container to the app? This might be ideal from a co fig perspective.
Xanza@lemm.ee 1 month ago
Yes, you just have to enable the built-in plugin for cloudflared: github.com/fail2ban/fail2ban/…/cloudflare.conf
computergeek125@lemmy.world 1 month ago
fail2ban isn’t a WAF?