Theres a number of actions that Fail2Ban can trigger, but most of them are localized to the local machine (plus maybe some reporting). My mail host has IMAP and POP proxied, meaning their bans need to be put on the proxy. We can create an [nginx-noscript] jail to ban clients that are searching for scripts on the website to execute and exploit. Thanks @hugalafutro. Why are non-Western countries siding with China in the UN? 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. This textbox defaults to using Markdown to format your answer. Looking at the logs, it makes sense, because my public IP is now what NPM is using to make the decision, and that's not a Cloudflare IP. Evaluate your needs and threats and watch out for alternatives. Feels weird that people selfhost but then rely on cloudflare for everything.. Who says that we can't do stuff without Cloudflare? Solution: It's setting custom action to ban and unban and also use Iptables forward from forward to f2b-npm-docker, f2b-emby which is more configuring up docker network, my docker containers are all in forward chain network, you can change FOWARD to DOCKER-USER or INPUT according to your docker-containers network. For instance, for the Nginx authentication prompt, you can give incorrect credentials a number of times. However, by default, its not without its drawbacks: Fail2Ban uses iptables @BaukeZwart Can we get free domain using cloudfare, I got a domain from duckdns and added it nginx reverse proxy but fail2ban is not banning the ip's, can I use cloudfare with free domain and nginx proxy, do you have any config for docker please? To learn more, see our tips on writing great answers. WebAs I started trying different settings to get one of services to work I changed something and am now unable to access the webUI. It works for me also. I'm not all that technical so perhaps someone else can confirm whether this actually works for npm. This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. 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:, request: "GET / HTTP/1.1", upstream: "https://:443/", host: "" PTIJ Should we be afraid of Artificial Intelligence? The log shows "failed to execute ban jail" and "error banning" despite the ban actually happening (probably at the cloudflare level. However, it has an unintended side effect of blocking services like Nextcloud or Home Assistant where we define the trusted proxies. It seemed to work (as in I could see some addresses getting banned), for my configuration, but I'm not technically adept enough to say why it wouldn't for you. I've setup nginxproxymanager and would Because this also modifies the chains, I had to re-define it as well. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. Create an account to follow your favorite communities and start taking part in conversations. Wed like to help. To change this behavior, use the option forwardfor directive. The unban action greps the deny.conf file for the IP address and removes it from the file. Fail2ban is a daemon to ban hosts that cause multiple authentication errors.. Install/Setup. @hugalafutro I tried that approach and it works. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? 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. actionunban = -D f2b- -s -j The condition is further split into the source, and the destination. 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. You could also use the action_mwl action, which does the same thing, but also includes the offending log lines that triggered the ban: Now that you have some of the general fail2ban settings in place, we can concentrate on enabling some Nginx-specific jails that will monitor our web server logs for specific behavior patterns. Hello, thanks for this article! It's the configuration of it that would be hard for the average joe. This will allow Nginx to block IPs that Fail2ban identifies from the Nginx error log file. You can add additional IP addresses or networks delimited by a space, to the existing list: Another item that you may want to adjust is the bantime, which controls how many seconds an offending member is banned for. Fail2ban already blocked several Chinese IPs because of this attempt, and I lowered to maxretry 0 and ban for one week. The suggestion to use sendername doesnt work anymore, if you use mta = mail, or perhaps it never did. edit: most of your issues stem from having different paths / container / filter names imho, set it up exactly as I posted as that works to try it out, and then you can start adjusting paths and file locations and container names provided you change them in all relevant places. Privacy or security? I have configured the fail2ban service - which is located at the webserver - to read the right entrys of my log to get the outsiders IP and blocks it. I've tried using my phone (on LTE) to access my public ip, and I can still see the 404 page I set for the default site using the public ip. 0. uses publicly licensed GitHub information to provide developers around the world with solutions to their problems. is there a chinese version of ex. Check the packet against another chain. Once this option is set, HAProxy will take the visitors IP address and add it as a HTTP header to the request it makes to the backend. So hardening and securing my server and services was a non issue. If you are using volumes and backing them up nightly you can easily move your npm container or rebuild it if necessary. I understand that there are malicious people out there and there are users who want to protect themselves, but is f2b the only way for them to do this? This is set by the ignoreip directive. The card will likely have a 0, and the view will be empty, or should, so we need to add a new host. Lol. If you are interested in protecting your Nginx server with fail2ban, you might already have a server set up and running. Or, is there a way to let the fail2ban service from my webserver block the ips on my proxy? 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. To learn how to set up a user with sudo privileges, follow our initial server setup guide for Ubuntu 14.04. In the volume directive of the compose file, you mention the path as - "../nginx-proxy-manager/data/logs/:/log/npm/:ro". Maybe recheck for login credentials and ensure your API token is correct. This will prevent our changes from being overwritten if a package update provides a new default file: Open the newly copied file so that we can set up our Nginx log monitoring: We should start by evaluating the defaults set within the file to see if they suit our needs. This worked for about 1 day. Bitwarden is a password manager which uses a server which can be 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. Super secret stuff: I'm not working on v2 anymore, and instead slowly working on v3. This change will make the visitors IP address appear in the access and error logs. The above filter and jail are working for me, I managed to block myself. So now there is the final question what wheighs more. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. All rights belong to their respective owners. It works form me. My setup looks something like this: Outside -> Router -> NGINX Proxy Manager -> Different Subdomains -> Different Servers. 4/5* with rice. Is that the only thing you needed that the docker version couldn't do? We need to create the filter files for the jails weve created. First, create a new jail: [nginx-proxy] enabled = true port = http logpath = % Would be great to have fail2ban built in like the linuxserver/letsencrypt Docker container! for reference There are a few ways to do this. In production I need to have security, back ups, and disaster recovery. In NPM Edit Proxy Host added the following for real IP behind Cloudflare in Custom Nginx Configuration: The one thing I didnt really explain is the actionflush line, which is defines in iptables-common.conf. This is important - reloading ensures that changes made to the deny.conf file are recognized. So please let this happen! WebFail2Ban is a wonderful tool for managing failed authentication or usage attempts for anything public facing. What command did you issue, I'm assuming, from within the f2b container itself? Fail2ban does not update the iptables. So, is there a way to setup and detect failed login attemps of my webservices from my proxy server and if so, do youve got a hint? However, you must ensure that only IPv4 and IPv6 IP addresses of the Cloudflare network are allowed to talk to your server. Making statements based on opinion; back them up with references or personal experience. 502 Bad Gateway in Nginx commonly occurs when Nginx runs as a reverse proxy, and is unable to connect to backend services. You may also have to adjust the config of HA. HAProxy is performing TLS termination and then communicating with the web server with HTTP. Docker installs two custom chains named DOCKER-USER and DOCKER. Any guesses? 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. When a proxy is internet facing, is the below the correct way to ban? If you do not use telegram notifications, you must remove the action With both of those features added i think this solution would be ready for smb production environments. In this guide, we will demonstrate how to install fail2ban and configure it to monitor your Nginx logs for intrusion attempts. Asked 4 months ago. The stream option in NPM literally says "use this for FTP, SSH etc." I started my selfhosting journey without Cloudflare. I am having an issue with Fail2Ban and nginx-http-auth.conf filter. I've tried both, and both work, so not sure which is the "most" correct. actionban = -I f2b- 1 -s -j Fail2ban is a daemon to ban hosts that cause multiple authentication errors.. Install/Setup. Once you have your MTA set up, you will have to adjust some additional settings within the [DEFAULT] section of the /etc/fail2ban/jail.local file. To make modifications, we need to copy this file to /etc/fail2ban/jail.local. Requests from HAProxy to the web server will contain a HTTP header named X-Forwarded-For that contains the visitors IP address. Some update on fail2ban, since I don't see this happening anytime soon, I created a fail2ban filter myself. You'll also need to look up how to block http/https connections based on a set of ip addresses. The key defined by the proxy_cache_key directive usually consists of embedded variables (the default key, $scheme$proxy_host$request_uri, has three variables). @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. Working on improving health and education, reducing inequality, and spurring economic growth? So why not make the failregex scan al log files including fallback*.log only for Client.. 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. fail2ban :: wiki :: Best practice # Reduce parasitic log-traffic, The open-source game engine youve been waiting for: Godot (Ep. Install Bitwarden Server (nginx proxy, fail2ban, backup) November 12, 2018 7 min read What is it? The number of distinct words in a sentence. WebTo y'all looking to use fail2ban with your nginx-proxy-manager in docker here's a tip: In your jail.local file under where the section (jail) for nginx-http-auth is you need to add this line so 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': '', 'family': 'inet4', 'fid': at 0x7f0d4ec48820>, 'raw-ticket': at 0x7f0d4ec48ee0>})': Error banning Have you correctly bind mounted your logs from NPM into the fail2ban container? When started, create an additional chain off the jail name. i.e. Same thing for an FTP server or any other kind of servers running on the same machine. But at the end of the day, its working. 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've got a few things running behind nginx proxy manager and they all work because the basic http (s)://IP:port request locally auto loads the desired location. 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- When unbanned, delete the rule that matches that IP address. Yep. +1 for both fail2ban and 2fa support. 2023 DigitalOcean, LLC. Then the services got bigger and attracted my family and friends. What i would like to prevent are the last 3 lines, where the return code is 401. 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:. I then created a separate instance of the f2b container following your instructions, which also seem to work (at least so far). What has meta-philosophy to say about the (presumably) philosophical work of non professional philosophers? in this file fail2ban/data/jail.d/npm-docker.local They just invade your physical home and take everything with them or spend some time to find a 0-day in one of your selfhosted exposed services to compromise your server. If you are using volumes and backing them up nightly you can easily move your npm container or rebuild it if necessary. I've been hoping to use fail2ban with my npm docker compose set-up. --The same result happens if I comment out the line "logpath - /var/log/npm/*.log". However, I still receive a few brute-force attempts regularly although Cloudflare is active. -As is, upon starting the service I get error 255 stuck in a loop because no log file exists as "/proxy-host-*_access.log". Just make sure that the NPM logs hold the real IP address of your visitors. Hi, thank you so much for the great guide! It works for me also. These will be found under the [DEFAULT] section within the file. Your browser does not support the HTML5

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