Fail2Ban is a wonderful tool for managing failed authentication or usage attempts for anything public facing. Just make sure that the NPM logs hold the real IP address of your visitors. How would I easily check if my server is setup to only allow cloudflare ips? We can add an [nginx-noproxy] jail to match these requests: When you are finished making the modifications you need, save and close the file. We need to create the filter files for the jails weve created. Create a file called "nginx-docker" in /etc/fail2ban/filder.d with the following contents, This will jail all requests that return a 4xx/3xx code on the main ip or a 400 on the specified hosts in the docker (no 300 here because of redirects used to force HTTPS). Or can put SSL certificates on your web server and still hide traffic from them even if they are the proxy? You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link! https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-14-04. Nothing helps, I am not sure why, and I dont see any errors that why is F2B unable to update the iptables rules. https://www.reddit.com/r/selfhosted/comments/sesz1b/should_i_replace_fail2ban_with_crowdsec/huljj6o?utm_medium=android_app&utm_source=share&context=3. The condition is further split into the source, and the destination. Use the "Hosts " menu to add your proxy hosts. They can and will hack you no matter whether you use Cloudflare or not. so even in your example above, NPM could still be the primary and only directly exposed service! Sign in If that chain didnt do anything, then it comes back here and starts at the next rule. Begin by changing to the filters directory: We actually want to start by adjusting the pre-supplied Nginx authentication filter to match an additional failed login log pattern. How would fail2ban work on a reverse proxy server? Or may be monitor error-log instead. Have a question about this project? Connect and share knowledge within a single location that is structured and easy to search. Errata: both systems are running Ubuntu Server 16.04. https://www.authelia.com/ Very informative and clear. According to https://www.home-assistant.io/docs/ecosystem/nginx/, it seems that you need to enable WebSocket support. This one mixes too many things together. Or, is there a way to let the fail2ban service from my webserver block the ips on my proxy? The sendername directive can be used to modify the Sender field in the notification emails: In fail2ban parlance, an action is the procedure followed when a client fails authentication too many times. UsingRegex: ^.+" (4\d\d|3\d\d) (\d\d\d|\d) .+$ ^.+ 4\d\d \d\d\d - .+ \[Client \] \[Length .+\] ".+" .+$, [20/Jan/2022:19:19:45 +0000] - - 404 - GET https somesite.ca "/wp-login.php" [Client 8.8.8.8] [Length 172] [Gzip 3.21] [Sent-to somesite] "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36" "-", DISREGARD It Works just fine! Scheme: http or https protocol that you want your app to respond. @dariusateik i do not agree on that since the letsencrypt docker container also comes with fail2ban, 'all reverse proxy traffic' will go through this container and is therefore a good place to handle fail2ban. -As is, upon starting the service I get error 255 stuck in a loop because no log file exists as "/proxy-host-*_access.log". Thanks! And now, even with a reverse proxy in place, Fail2Ban is still effective. Next, we can copy the apache-badbots.conf file to use with Nginx. Working on improving health and education, reducing inequality, and spurring economic growth? Should be usually the case automatically, if you are not using Cloudflare or your service is using custom headers. You get paid; we donate to tech nonprofits. Will removing "cloudflare-apiv4" from the config and foregoing the cloudflare specific action.d file run fine? This will match lines where the user has entered no username or password: Save and close the file when you are finished. This varies based on your Linux distribution, but for most people, if you look in /etc/apache2, you should be able to search to find the line:. Here is the sample error log from nginx 2017/10/18 06:55:51 [warn] 34604#34604: *1 upstream server temporarily disabled while connecting to upstream, client: , server: mygreat.server.com, request: "GET / HTTP/1.1", upstream: "https://:443/", host: "mygreat.server.com" Any guidance welcome. Thanks for writing this. The card will likely have a 0, and the view will be empty, or should, so we need to add a new host. When i used this command: sudo iptables -S some Ips also showed in the end, what does that means? Requests coming from the Internet will hit the proxy server (HAProxy), which analyzes the request and forwards it on to the appropriate server (Nginx). The main one we care about right now is INPUT, which is checked on every packet a host receives. Yes fail2ban would be the cherry on the top! +1 for both fail2ban and 2fa support. Asked 4 months ago. I used to have all these on the same vm and it worked then, later I moved n-p-m to vm where my mail server is, and the vm with nextcloud and ha and other stuff is being tunelled via mullvad and everything still seems to work. WebNow Im trying to get homelab-docs.mydomain.com to go through the tunnel, hit the reverse proxy, and get routed to the backend container thats running dokuwiki. I followed the above linked blog and (on the second attempt) got the fail2ban container running and detecting my logs, but I do get an error which (I'm assuming) actually blocks any of the ban behavior from taking effect: f2b | 2023-01-28T16:41:28.094008433Z 2023-01-28 11:41:28,093 fail2ban.actions [1]: ERROR Failed to execute ban jail 'npm-general-forceful-browsing' action 'action-ban-docker-forceful-browsing' info 'ActionInfo({'ip': '75.225.129.88', 'family': 'inet4', 'fid': at 0x7f0d4ec48820>, 'raw-ticket': at 0x7f0d4ec48ee0>})': Error banning 75.225.129.88. /var/log/apache/error_log) and bans IPs that show the malicious signs -- too many password failures, seeking for exploits, etc. bleepcoder.com uses publicly licensed GitHub information to provide developers around the world with solutions to their problems. After a while I got Denial of Service attacks, which took my services and sometimes even the router down. @jellingwood Finally, configure the sites-enabled file with a location block that includes the deny.conf file Fail2ban is writing to. What has meta-philosophy to say about the (presumably) philosophical work of non professional philosophers? By clicking Sign up for GitHub, you agree to our terms of service and For most people on here that use Cloudflare it's simply a convenience that offers a lot of functionality for free at the cost of them potentially collecting any data that you send through it. If you do not use PHP or any other language in conjunction with your web server, you can add this jail to ban those who request these types of resources: We can add a section called [nginx-badbots] to stop some known malicious bot request patterns: If you do not use Nginx to provide access to web content within users home directories, you can ban users who request these resources by adding an [nginx-nohome] jail: We should ban clients attempting to use our Nginx server as an open proxy. With both of those features added i think this solution would be ready for smb production environments. Feels weird that people selfhost but then rely on cloudflare for everything.. Who says that we can't do stuff without Cloudflare? Server Fault is a question and answer site for system and network administrators. Otherwise, Fail2ban is not able to inspect your NPM logs!". I guess Ill stick to using swag until maybe one day it does. Proxy: HAProxy 1.6.3 Hope I have time to do some testing on this subject, soon. Tldr: Don't use Cloudflare for everything. A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control. We can use this file as-is, but we will copy it to a new name for clarity. I guess fail2ban will never be implemented :(. Just Google another fail2ban tutorial, and you'll get a much better understanding. I know there is already an option to "block common exploirts" but I'm not sure what that actually does, and fail2ban is quite a robust way of dealing with attacks. The steps outlined here make many assumptions about both your operating environment and We now have to add the filters for the jails that we have created. Proxying Site Traffic with NginX Proxy Manager. So please let this happen! You can see all of your enabled jails by using the fail2ban-client command: You should see a list of all of the jails you enabled: You can look at iptables to see that fail2ban has modified your firewall rules to create a framework for banning clients. But if you Sign up for Infrastructure as a Newsletter. If you are using volumes and backing them up nightly you can easily move your npm container or rebuild it if necessary. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Fail2Ban runs as root on this system, meaning I added roots SSH key to the authorized_keys of the proxy hosts user with iptables access, so that one can SSH into the other. privacy statement. I used following guides to finally come up with this: https://www.the-lazy-dev.com/en/install-fail2ban-with-docker/ - iptable commands etc .. Hope this helps some one like me who is trying to solve the issues they face with fail2ban and docker networks :). My dumbness, I am currently using NPM with a MACVLAN, therefore the fail2ban container can read the mounted logs and create ip tables on the host, but the traffice from and to NPM is not going to the iptables of the host because of the MACVLAN and so banning does not work. I also adjusted the failregex in filter.d/npm-docker.conf, here is the file content: Referencing the instructions that @hugalafutro mentions here: I attempted to follow your steps, however had a few issues: The compose file you mention includes a .env file, however you didn't provide the contents of this file. For all we care about, a rules action is one of three things: When Fail2Ban matches enough log lines to trigger a ban, it executes an action. This will let you block connections before they hit your self hosted services. I switched away from that docker container actually simply because it wasn't up-to-date enough for me. Hi, sorry me if I dont understand:( I've tried to add the config file outside the container, fail2ban is running but seems to not catch the bad ip, i've tried your rules with fail2ban-regex too but I noted: SUMMARY: it works, using the suggested config outside the container, on the host. So I have 2 "working" iterations, and need to figure out the best from each and begin to really understand what I'm doing, rather than blindly copying others' logs. Then I added a new Proxy Host to Nginx Proxy Manager with the following configuration: Details: Domain Name: (something) Scheme: http IP: 192.168.123.123 Port: 8080 Cache Assets: disabled Block Common Exploits: enabled Websockets Support: enabled Access List: Publicly Accessible SSL: Force SSL: enabled HSTS Enabled: enabled HTTP/2 Ackermann Function without Recursion or Stack. @vrelk Upstream SSL hosts support is done, in the next version I'll release today. These will be found under the [DEFAULT] section within the file. Well, i did that for the last 2 days but i cant seem to find a working answer. On one hand, this project's goals was for the average joe to be able to easily use HTTPS for their incoming websites; not become a network security specialist. 100 % agree - > On the other hand, f2b is easy to add to the docker container. Right, they do. You signed in with another tab or window. Each chain also has a name. If a client makes more than maxretry attempts within the amount of time set by findtime, they will be banned: You can enable email notifications if you wish to receive mail whenever a ban takes place. In my case, my folder is just called "npm" and is within the ~/services directory on my server, so I modified it to be (relative to the f2b compose file) ../npm/data/logs. Create a folder fail2ban and create the docker-compose.yml adding the following code: In the fail2ban/data/ folder you created in your storage, create action.d, jail.d, filter.d folders and copy the files in the corresponding folder of git into them. I get a Telegram notification for server started/shut down, but the service does not ban anything, or write to the logfile. I am behind Cloudflare and they actively protect against DoS, right? So I added the fallback__.log and the fallback-_.log to my jali.d/npm-docker.local. Might be helpful for some people that want to go the extra mile. is there a chinese version of ex. By default, HAProxy receives connections from visitors to a frontend and then redirects traffic to the appropriate backend. I am after this (as per my /etc/fail2ban/jail.local): All I need is some way to modify the iptables rules on a remote system using shell commands. For example, Nextcloud required you to specify the trusted domains (https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/config_sample_php_parameters.html). Each rule basically has two main parts: the condition, and the action. WebAs I started trying different settings to get one of services to work I changed something and am now unable to access the webUI. Were not getting into any of the more advanced iptables stuff, were just doing standard filtering. How to increase the number of CPUs in my computer? But is the regex in the filter.d/npm-docker.conf good for this? wessel145 - I have played with the same problem ( docker ip block ) few days :) finally I have working solution; actionstop = -D DOCKER-USER -p -m conntrack --ctorigdstport --ctdir ORIGINAL -j f2b- (Note: if you change this header name value, youll want to make sure that youre properly capturing it within Nginx to grab the visitors IP address). rev2023.3.1.43269. If npm will have it - why not; but i am using crazymax/fail2ban for this; more complexing docker, more possible mistakes; configs, etc; how will be or f2b integrated - should decide jc21. Today's video is sponsored by Linode!Sign up today and get a $100 60-day credit on your new Linode account, link is in the description. https://dbte.ch/linode/=========================================/This video assumes that you already use Nginx Proxy Manager and Cloudflare for your self-hosting.Fail2ban scans log files (e.g. WebFail2Ban is a wonderful tool for managing failed authentication or usage attempts for anything public facing. 502 Bad Gateway in Nginx commonly occurs when Nginx runs as a reverse proxy, and is unable to connect to backend services. Description. Currently fail2ban doesn't play so well sitting in the host OS and working with a container. in nextcloud I define the trusted proxy like so in config.php: in ha I define it in configuration.yaml like so: Hi all, Secure Your Self Hosting with Fail2Ban + Nginx Proxy Manager + CloudFlare 16,187 views Jan 20, 2022 Today's video is sponsored by Linode! Your browser does not support the HTML5
