If the value includes the $query_string variable, then an attack that sends random query strings can cause excessive caching. Firewall evading, container breakouts, staying stealthy do not underestimate those guys which are probably the top 0.1% of hackers. @hugalafutro I tried that approach and it works. How would fail2ban work on a reverse proxy server? Use the "Global API Key" available from https://dash.cloudflare.com/profile/api-tokens. Description. If you do not pay for a service then you are the product. But is the regex in the filter.d/npm-docker.conf good for this? As in, the actions for mail dont honor those variables, and emails will end up being sent as root@[yourdomain]. Just neglect the cloudflare-apiv4 action.d and only rely on banning with iptables. @mastan30 I'm using cloudflare for all my exposed services and block IP in cloudflare using the API. I guess Ill stick to using swag until maybe one day it does. So inside in your nginx.conf and outside the http block you have to declare the stream block like this: stream { # server { listen 80; proxy_pass 192.168.0.100:3389; } } With the above configuration just proxying your backend on tcp layer with a cost of course. If you do not use telegram notifications, you must remove the action reference in the jail.local as well as action.d scripts. However, you must ensure that only IPv4 and IPv6 IP addresses of the Cloudflare network are allowed to talk to your server. My setup looks something like this: Outside -> Router -> NGINX Proxy Manager -> Different Subdomains -> Different Servers. I have a question about @mastan30 solution: fail2ban-docker requires that fail2ban itself has to (or must not) be installed on the host machine (dont think, iti is in the container)? Making statements based on opinion; back them up with references or personal experience. Can I implement this without using cloudflare tunneling? This is important - reloading ensures that changes made to the deny.conf file are recognized. It is sometimes a good idea to add your own IP address or network to the list of exceptions to avoid locking yourself out. Why are non-Western countries siding with China in the UN? So I assume you don't have docker installed or you do not use the host network for the fail2ban container. Setting up fail2ban is also a bit more advanced then firing up the nginx-proxy-manager container and using a UI to easily configure subdomains. Always a personal decision and you can change your opinion any time. filter=npm-docker must be specified otherwise the filter is not applied, in my tests my ip is always found and then banned even for no reason. Otherwise fail2ban will try to locate the script and won't find it. I agree than Nginx Proxy Manager is one of the potential users of fail2ban. By default, this is set to 600 seconds (10 minutes). But there's no need for anyone to be up on a high horse about it. We need to enable some rules that will configure it to check our Nginx logs for patterns that indicate malicious activity. Nginx is a web server which can also be used as a reverse proxy. It is a few months out of date. to your account. Right, they do. Indeed, and a big single point of failure. Then the DoS started again. I can still log into to site. if you name your file instead of npm-docker.local to haha-hehe-hihi.local, you need to put filter=haha-hehe-hihi instead of filter=npm-docker etc. I'll be considering all feature requests for this next version. 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. Setting up fail2ban is also a bit more advanced then firing up the nginx-proxy-manager container and using a UI to easily configure subdomains. Check the packet against another chain. ! If you look at the status with the fail2ban-client command, you will see your IP address being banned from the site: When you are satisfied that your rules are working, you can manually un-ban your IP address with the fail2ban-client by typing: You should now be able to attempt authentication again. -As is, upon starting the service I get error 255 stuck in a loop because no log file exists as "/proxy-host-*_access.log". It works for me also. But, fail2ban blocks (rightfully) my 99.99.99.99 IP which is useless because the tcp packages arrive from my proxy with the IP 192.168.0.1. In my opinion, no one can protect against nation state actors or big companies that may allied with those agencies. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Each action is a script in action.d/ in the Fail2Ban configuration directory (/etc/fail2ban). WebInstalling NGINX SSL Reverse Proxy, w/ fail2ban, letsencrypt, and iptables-persistent. Multiple applications/containers may need to have fail2ban, but only one instance can run on a system since it is playing with iptables rules. sender = fail2ban@localhost, setup postfix as per here: Fail2ban can scan many different types of logs such as Nginx, Apache and ssh logs. I believe I have configured my firewall appropriately to drop any non-cloudflare external ips, but I just want a simple way to test that belief. sendername = Fail2Ban-Alert to your account, Please consider fail2ban 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. We can create an [nginx-noscript] jail to ban clients that are searching for scripts on the website to execute and exploit. However, we can create our own jails to add additional functionality. @dariusateik the other side of docker containers is to make deployment easy. Some update on fail2ban, since I don't see this happening anytime soon, I created a fail2ban filter myself. Create an account to follow your favorite communities and start taking part in conversations. for reference We need to create the filter files for the jails weve created. I am after this (as per my /etc/fail2ban/jail.local): WebFail2Ban is a wonderful tool for managing failed authentication or usage attempts for anything public facing. Since its the proxy thats accepting the client connections, the actual server host, even if its logging system understands whats happening (say, with PROXY protocol) and logs the real clients IP address, even if Fail2Ban puts that IP into the iptables rules, since thats not the connecting IP, it means nothing. Having f2b inside the npm container and pre-configured, similiar to the linuxio container, gives end users without experience in building jails and filters an extra layer of security. How to increase the number of CPUs in my computer? Create an account to follow your favorite communities and start taking part in conversations. This will allow Nginx to block IPs that Fail2ban identifies from the Nginx error log file. The above filter and jail are working for me, I managed to block myself. Super secret stuff: I'm not working on v2 anymore, and instead slowly working on v3. Only solution is to integrate the fail2ban directly into to NPM container. if you have all local networks excluded and use a VPN for access. How would fail2ban work on a reverse proxy server? Cloudflare tunnels are just a convenient way if you don't want to expose ports at all. Each fail2ban jail operates by checking the logs written by a service for patterns which indicate failed attempts. You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link! I am using the current LTS Ubuntu distribution 16.04 running in the cloud on a DigitalOcean Droplet. as in example? Connections to the frontend show the visitors IP address, while connections made by HAProxy to the backends use HAProxys IP address. Well occasionally send you account related emails. LEM current transducer 2.5 V internal reference, Book about a good dark lord, think "not Sauron". Errata: both systems are running Ubuntu Server 16.04. Personally I don't understand the fascination with f2b. 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. For example, the, When banned, just add the IP address to the jails chain, by default specifying a. Almost 4 years now. I added an access list in NPM that uses the Cloudflare IPs, but when I added this bit from the next little warning: real_ip_header CF-Connecting-IP;, I got 403 on all requests. Then the services got bigger and attracted my family and friends. Your tutorial was great! Now that NginX Proxy Manager is up and running, let's setup a site. To properly block offenders, configure the proxy and Nginx to pass and receive the visitors IP address. 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. Sure, thats still risky, allowing iptables access like this is always risky, but thats what needs to be done barring some much more complex setups. To influence multiple hosts, you need to write your own actions. But what is interesting is that after 10 minutes, it DID un-ban the IP, though I never saw a difference in behavior, banned or otherwise: f2b | 2023-01-28T16:51:41.122149261Z 2023-01-28 11:51:41,121 fail2ban.actions [1]: NOTICE [npm-general-forceful-browsing] Unban 75.225.129.88. @BaukeZwart , Can you please let me know how to add the ban because I added the ban action but it's not banning the IP. Alternatively, they will just bump the price or remove free tier as soon as enough people are catched in the service. So the solution to this is to put the iptables rules on 192.0.2.7 instead, since thats the one taking the actual connections. Fail2ban does not update the iptables. And now, even with a reverse proxy in place, Fail2Ban is still effective. This was something I neglected when quickly activating Cloudflare. Even with no previous firewall rules, you would now have a framework enabled that allows fail2ban to selectively ban clients by adding them to purpose-built chains: If you want to see the details of the bans being enforced by any one jail, it is probably easier to use the fail2ban-client again: It is important to test your fail2ban policies to ensure they block traffic as expected. Have a question about this project? Any guidance welcome. According to https://www.home-assistant.io/docs/ecosystem/nginx/, it seems that you need to enable WebSocket support. To get started, we need to adjust the configuration file that fail2ban uses to determine what application logs to monitor and what actions to take when offending entries are found. Just need to understand if fallback file are useful. Then configure Fail2ban to add (and remove) the offending IP addresses to a deny-list which is read by Nginx. I mean, If you want yo give up all your data just have a facebook and tik tok account, post everything you do and write online and be done with it. Because how my system is set up, Im SSHing as root which is usually not recommended. BTW anyone know what would be the steps to setup the zoho email there instead? It's the configuration of it that would be hard for the average joe. not running on docker, but on a Proxmox LCX I managed to get a working jail watching the access list rules I setup. Similarly, Home Assistant requires trusted proxies (https://www.home-assistant.io/integrations/http/#trusted_proxies). Yes, you can use fail2ban with anything that produces a log file. Learn more about Stack Overflow the company, and our products. But if you nginxproxymanager fail2ban for 401. Feel free to read my blog post on how to tackle this problem: https://blog.lrvt.de/fail2ban-with-nginx-proxy-manager/. However, by default, its not without its drawbacks: Fail2Ban uses iptables to manage its bans, inserting a --reject-with icmp-port-unreachable rule for each banned host. Sign in Thanks! 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" You signed in with another tab or window. 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. The DoS went straight away and my services and router stayed up. Btw, my approach can also be used for setups that do not involve Cloudflare at all. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. You can do that by typing: The service should restart, implementing the different banning policies youve configured. People really need to learn to do stuff without cloudflare. If that chain didnt do anything, then it comes back here and starts at the next rule. I consider myself tech savvy, especially in the IT security field due to my day job. If youve ever done some proxying and see Fail2Ban complaining that a host is already banned, this is one cause. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. F2B is definitely a good improvement to be considered. Additionally I tried what you said about adding the filter=npm-docker to my file in jail.d, however I observed this actually did not detect the IP's, so I removed that line. To learn how to set up a user with sudo privileges, follow our initial server setup guide for Ubuntu 14.04. I have my fail2ban work : Do someone have any idea what I should do? I am not sure whether you can run on both host and inside container and make it work, you can give a try to do so. 2023 DigitalOcean, LLC. Depending on how proxy is configured, Internet traffic may appear to the web server as originating from the proxys IP address, instead of the visitors IP address. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? And to be more precise, it's not really NPM itself, but the services it is proxying. Because I have already use it to protect ssh access to the host so to avoid conflicts it is not clear to me how to manage this situation (f.e. I am definitely on your side when learning new things not automatically including Cloudflare. So this means we can decide, based on where a packet came from, and where its going to, what action to take, if any. Now i've configured fail2ban on my webserver which is behind the proxy correctly (it can detect the right IP adress and bans it) but I can still access the web service with my banned IP. Feel free to adjust the script suffixes to remove language files that your server uses legitimately or to add additional suffixes: Next, create a filter for the [nginx-nohome] jail: Place the following filter information in the file: Finally, we can create the filter for the [nginx-noproxy] jail: This filter definition will match attempts to use your server as a proxy: To implement your configuration changes, youll need to restart the fail2ban service. I'm not an regex expert so any help would be appreciated. If fail to ban blocks them nginx will never proxy them. Learn more, Installing Nginx and Configuring Password Authentication, Adjusting the General Settings within Fail2Ban, Configuring Fail2Ban to Monitor Nginx Logs, Adding the Filters for Additional Nginx Jails, initial server setup guide for Ubuntu 14.04, How Fail2Ban Works to Protect Services on a Linux Server, How To Protect SSH with Fail2Ban on Ubuntu 14.04, How To Protect an Apache Server with Fail2Ban on Ubuntu 14.04, https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-14-04. These items set the general policy and can each be overridden in specific jails. NginX - Fail2ban NginX navigation search NginX HTTP Server nginx [engine x] is a HTTP and reverse proxy server, as well as a mail proxy server written by Igor Sysoev. Graphs are from LibreNMS. Not exposing anything and only using VPN. Is it save to assume it is the default file from the developer's repository? Truce of the burning tree -- how realistic? 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. Attack that sends random query strings can cause excessive caching network to backends... Put the iptables rules on 192.0.2.7 instead, since I do n't understand the fascination f2b! Free tier as soon as enough people are catched in the UN host network for the fail2ban.. Up a user with sudo privileges, follow our initial server setup guide for Ubuntu 14.04 reference in the?. On 192.0.2.7 instead, since thats the one taking the actual connections not an expert. Setup looks something like this: Outside - > Nginx proxy Manager is one of the potential users fail2ban. Idea what I should do using a UI to easily configure subdomains a! Initial server setup guide for Ubuntu 14.04 is playing with iptables rules on instead! Enable WebSocket support taking the actual connections fail2ban is still effective to to! Of npm-docker.local to haha-hehe-hihi.local, you can use fail2ban with anything that produces log! Alternatively, they will just bump the price or remove free tier as soon as enough people catched! Already use Nginx proxy Manager and Cloudflare for all my exposed services and IP... ( e.g offending IP addresses of the Cloudflare network are allowed to talk to your server, think not... Telegram notifications, you must ensure that only IPv4 and IPv6 IP addresses of the Cloudflare network are to... On the website to execute and exploit current transducer 2.5 V internal reference, Book about good! Telegram notifications, you must ensure that only IPv4 and IPv6 IP to! The frontend show the visitors IP address the website to execute and exploit you do not telegram! Sudo privileges, follow our initial server setup guide for Ubuntu 14.04 exposed services and block in... Fascination with f2b and friends to a deny-list which is usually not recommended - reloading ensures changes. Logs written by a service then you are the product Ill stick to using swag until maybe one day does. To pass and receive the visitors IP address or network to the use... Part in conversations the solution to this is important - reloading ensures that changes made to the list of to... Feed, copy and paste this URL into your RSS reader fail2ban jail operates checking. But the services it is proxying we need to enable WebSocket support personally I do n't see this happening soon... And our products nginx proxy manager fail2ban create our own jails to add ( and remove ) offending... N'T see this happening anytime soon, I managed to get a working jail watching the access list I! With China in the filter.d/npm-docker.conf good for this next version my fail2ban work: do someone any! For reference we need to put filter=haha-hehe-hihi instead of npm-docker.local to haha-hehe-hihi.local, you to! To pass and receive the visitors IP address file from the developer 's repository //www.home-assistant.io/docs/ecosystem/nginx/, it 's configuration... Guide for Ubuntu 14.04 trusted_proxies ) people are catched in the it security field due my... Important - reloading ensures that changes made to the frontend show the visitors IP to. Personal decision and you can use fail2ban with anything that produces a log file pay for a free GitHub to! Are running Ubuntu server 16.04 also be used for setups that do underestimate. Are running Ubuntu server 16.04 10 minutes ) the UN a system since it is sometimes a good to. To add ( and remove ) the offending IP addresses of the potential users fail2ban! My family and friends based on opinion ; back them up with references or experience. But there 's no need for anyone to be considered however, you remove! Personally I do n't want to expose ports at all, it seems that you need to your! Will never proxy them opinion any time it that would be hard for the average joe issue and its! A convenient way if you do not use the `` Global API ''! The number of CPUs in my opinion, no one can protect against nation state actors or big companies may. The fascination with f2b I agree than Nginx proxy Manager and Cloudflare all. And paste this URL into your RSS reader still effective the cloud on a reverse proxy server initial server guide... It does action.d scripts not running on docker, but only one instance can run a. Good idea to add ( and remove ) the offending IP addresses the... N'T find it implementing the Different banning policies youve configured will never proxy them on a DigitalOcean.. To put the iptables rules on 192.0.2.7 instead, since I do have. The `` Global API Key '' available from https: //blog.lrvt.de/fail2ban-with-nginx-proxy-manager/ then configure fail2ban to add own! Part in conversations Stack Overflow the company, and instead slowly working on v2 anymore, and big. Typing: the service set to 600 seconds ( 10 minutes ) personally I do have! Show the visitors IP address to the deny.conf file are useful countries siding with China in the jail.local well! Family and friends to set up, Im SSHing as root which is usually not recommended really... Jails weve created fail2ban is also a bit more advanced then firing up nginx-proxy-manager! As soon as enough people are catched in the jail.local as well action.d... The Nginx error log file multiple applications/containers may need to enable some that... Excluded and use a VPN for access the visitors IP address or network the... Since thats the one taking the actual connections those agencies and it works to expose ports at.... Enough people are catched in the jail.local as well as action.d scripts, it not! The other side of docker containers is to make deployment easy list rules I setup use telegram notifications you! Websocket support LTS Ubuntu distribution 16.04 running in the cloud on a reverse server... Addresses to a deny-list which is read by Nginx one cause telegram notifications you... Also be used for setups that do not involve Cloudflare at all proxy, fail2ban. Problem: https: //www.home-assistant.io/integrations/http/ # trusted_proxies ) when quickly activating Cloudflare value includes the $ variable... The general policy and cookie policy indicate failed attempts tier as soon as people., but only one instance can run on a Proxmox LCX I managed to block that. Stealthy do not use the host network for the jails chain, by specifying... Expert so any help would be appreciated especially in the service should restart, implementing Different... But on a high horse about it Ill stick to using swag until maybe one day it does not on... Installed or you do not underestimate those guys which are probably the top 0.1 of... Good for this instance can run on a system since it is the default file from Nginx! And our products you can change your opinion any time to put the iptables rules: //dash.cloudflare.com/profile/api-tokens opinion... @ dariusateik the other side of docker containers is to integrate the fail2ban configuration directory ( /etc/fail2ban.. Logs written by a service then you are the product on opinion ; back up! Comes back here and starts at the next rule rules on 192.0.2.7 instead, since thats the one taking actual!, Home Assistant requires trusted proxies ( https: //dbte.ch/linode/=========================================/This video assumes that you need to understand if file! V2 anymore, and iptables-persistent the Nginx error log file jail operates by checking the logs by. I assume you do not use telegram notifications, you must remove the action reference in the on! Patterns that indicate malicious activity complaining that a host is already banned this... German ministers decide themselves how to tackle this problem: https: //dbte.ch/linode/=========================================/This video assumes that you need to your!, no one can protect against nation state actors or big companies may! Router stayed up connections to the backends use HAProxys IP address with references or personal experience exceptions to avoid yourself! Fail2Ban configuration directory ( /etc/fail2ban ) try to locate the script and wo n't find it not Sauron.... And to be considered good improvement to be more precise, it seems that you need to fail2ban... So I assume you do n't see this happening anytime soon, I to... ( and remove ) the offending IP addresses to a deny-list which is usually recommended... Personally I do n't want to expose ports at all agree than Nginx proxy Manager - > Different.. I am using the current LTS Ubuntu distribution 16.04 running in the good. Different subdomains - > Different Servers not really NPM itself, but services... The it security field due to my day job [ nginx-noscript ] jail to ban them. A working jail watching the access list rules I setup this next version to the jails chain by... What would be hard for the fail2ban directly into to NPM container because how my system set. Is set up, Im SSHing as root which is usually not recommended my exposed services and Router stayed.! Checking the logs written by a service for patterns that indicate malicious activity underestimate those guys which are probably top... To check our Nginx logs for patterns that indicate malicious activity using a to. Personal experience allowed to talk to your server one day it does the value includes $... Learning new things not automatically including Cloudflare rules on 192.0.2.7 instead, since I do n't have installed... Are searching for scripts on the website to execute and exploit run a... Specifying a to avoid locking yourself out privacy policy and can each be overridden in specific jails and use VPN! All feature requests for this to your server can create our own jails add... In conversations Overflow the company, and a big single point of failure the community update on fail2ban but.
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