Standing up a new Discourse forum as a separate docker container on a dedicated physical server that is already running an existing Discourse forum (which is humming along with no errors). Bootstrapping works without errors and the initial “You’ve successfully installed Discourse!” message appears without issue, and I can enter my desired username & PW without any error. However, on submitting the form, rather than sending the initial registration email, Discourse displays a white page with ["BAD CSRF"] in the upper left corner. I’m honestly not even sure where to start troubleshooting this. Searching here on meta didn’t really yield any results that appear relevant. Suggestions on where to start looking?

[תמונה] pfaffman: It’s likely a problem with whatever is doing https. How’s that configured? The web server hosts 4 domains and seven separate web sites, so universal SSL termination is done by HAProxy so I can keep the layers separated and provide caching even to SSL content. The stack is HAProxy → Varnish (cache) → nginx reverse proxy → Discourse. Worth noting that I had no issues setting up the first Discourse forum under this same configuration. Edited to add - client connections are over https, but I’m proxying from nginx to the docker container’s HTTP port, not HTTPS (again, doing what works for the first Discourse instance). I can try changing that to the HTTPS port to see what happens, though, if that’ll help. edit^2 - no, that didn’t help.

Looking through the Discourse production.log and this is what I see: Started POST "/finish-installation/register" for 2601:2c4:c700:745f:216:3eff:0:11 at 2018-09-12 19:21:26 +0000 Processing by FinishInstallationController#register as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"[redacted]", "email"=>"redacted", "username"=>"redacted", "password"=>"[FILTERED]", "commit"=>"Register"} Can't verify CSRF token authenticity. Rendering text template Rendered text template (0.0ms) Filter chain halted as :verify_authenticity_token rendered or redirected Completed 403 Forbidden in 2ms (Views: 0.3ms | ActiveRecord: 0.0ms) Still looking through the other threads on meta where Can't verify CSRF token authenticity has come up. I also see the 403 response in Chrome’s console: Request URL: https://(forum url)/finish-installation/register Request Method: POST Status Code: 403 Remote Address: [2607:fad0:3524:1::8]:443 Referrer Policy: strict-origin-when-cross-origin

This happens when SSL is badly configured. Most of the times a header is missing from the reverse proxy config.

[תמונה] Falco: a header is missing from the reverse proxy config ^ this - the host header has to remain intact throughout, otherwise encryption can’t be established. Is it all IP/port based behind HAProxy? Out of curiosity why are you using HAProxy in front of Varnish and then nginx behind?

Right, and my first guess was to make sure X-Forwarded-Proto was being appended properly by the reverse proxy—and it is. That’s the annoying thing here—the configuration between the working forum and the new one is identical. And when I say “identical” I mean literally using the exact same processes and config files :smiley: They’re both on the same server, so other than the nginx configuration file in sites-available they’re even using the exact same set of configuration files. Everything’s the exact same. The nginx config is pretty short—hard for me to screw that up: server { server_name [redacted]; listen 8881; listen 8882 http2; sendfile on; location / { access_log off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Host $http_host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto https; proxy_redirect off; proxy_pass http://localhost:7996; } } The only differences between it and the config for the working forum is the server_name directive and the port I’m passing to.

[תמונה] Lee_Ars: They’re both on the same server, so other than the nginx configuration file in sites-available they’re even using the exact same set of configuration files. Everything’s the exact same. The nginx config is pretty short—hard for me to screw that up: Is HAProxy using a SAN cert, or unique IPs and separate certificates?

[תמונה] Stephen: Out of curiosity why are you using HAProxy in front of Varnish and then nginx behind? The overall config goals were to 1) encrypt everything and 2) cache everything. These are obviously opposing goals, so the way I went about it was to stratify things: SSL termination first, then a cache layer, then a web server that both serves static stuff and also functions as a reverse proxy as needed (for wordpress, discourse, and a few other things). I initially had a fair amount of trouble with the “nginx sandwich” approach (nginx → varnish → nginx)—getting two separate instances of nginx to work properly with Upstart on ubuntu 14.04 proved to be very difficult and required a lot of screwing around, so I ditched nginx as my ssl termination layer and went with haproxy instead. If I were redoing this now, I’d go with Hitch, but ripping out haproxy at this point would require some research on how to do the transition. edit: [תמונה] Stephen: Is HAProxy using a SAN cert, or unique IPs and separate certificates? HAProxy is using separate LetsEncrypt certificates (maintained via acme.sh), one per host. This is done mainly because the number of sites being hosted has changed over time and changing/updating a single SAN certificate proved to be kind of a pain in the ass. Additionally, I have a couple of tenant sites that would prefer to keep their SSL configs as separate from mine as possible.

[תמונה] Lee_Ars: getting two separate instances of nginx to work properly with Upstart on ubuntu 14.04 proved to be very difficult and required a lot of screwing around Fair enough, they’re just separate sites though in the same instance of NGINX, it’s quite a common setup. Due to the nature of the app Discourse doesn’t really respond well or need external caching, HAProxy is only going to give you some port-redirection-fu there, which Nginx also covers.

[תמונה] Lee_Ars: The only differences between it and the config for the working forum is the server_name directive and the port I’m passing to. Did you enable force_https in the second site?

Troubleshooting "BAD CSRF" error on initial site setup?

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pfaffman (Jay Pfaffman) 12 בספטמבר,‏ 2018,‏ 5:39pm 2

It’s likely a problem with whatever is doing https. How’s that configured?

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Troubleshooting "BAD CSRF" error on initial site setup?

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