Can't validate Zoom Meetings SDK due to CSRF Error

Support
1

Hi Team,

I’m trying to integrate discourse-zoom into a community app for my team. After creating and validating server-2-server Oauth app everything seemed fine, I’ve installed ‘discourse-oauth2-basic’ plugin in order to get the ‘/auth/oauth2_basic/callback’ URL needed to Authorize the Meetings SDK. After configuring the SDK and trying to start the authorization flow by pasting the generated url into my browser I keep getting the following error .

image
image726×106 4.4 KB

I did some research and found that a CSRF exception is raised by the underlying OmniAuth strategy code.

(oauth2_basic) Authentication failure! csrf_detected: OmniAuth::Strategies::OAuth2::CallbackError, csrf_detected | CSRF detected

Backtrace

/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/strategy.rb:163:in `log'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/strategy.rb:486:in `fail!'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-oauth2-1.7.3/lib/omniauth/strategies/oauth2.rb:87:in `callback_phase'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/strategy.rb:238:in `callback_call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/strategy.rb:189:in `call!'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/strategy.rb:169:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/omniauth-1.9.2/lib/omniauth/builder.rb:45:in `call'
/var/www/discourse/lib/middleware/omniauth_bypass_middleware.rb:43:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/tempfile_reaper.rb:15:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/conditional_get.rb:27:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/head.rb:12:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/http/permissions_policy.rb:38:in `call'
/var/www/discourse/lib/content_security_policy/middleware.rb:12:in `call'
/var/www/discourse/lib/middleware/anonymous_cache.rb:393:in `call'
/var/www/discourse/lib/middleware/csp_script_nonce_injector.rb:12:in `call'
/var/www/discourse/config/initializers/008-rack-cors.rb:14:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:266:in `context'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/session/abstract/id.rb:260:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/cookies.rb:704:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/callbacks.rb:27:in `block in call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/activesupport-7.0.8.1/lib/active_support/callbacks.rb:99:in `run_callbacks'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/debug_exceptions.rb:28:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/show_exceptions.rb:29:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/logster-2.19.1/lib/logster/middleware/reporter.rb:40:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.1/lib/rails/rack/logger.rb:40:in `call_app'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.1/lib/rails/rack/logger.rb:27:in `call'
/var/www/discourse/config/initializers/100-quiet_logger.rb:20:in `call'
/var/www/discourse/config/initializers/100-silence_logger.rb:29:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/remote_ip.rb:93:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/request_id.rb:26:in `call'
/var/www/discourse/lib/middleware/enforce_hostname.rb:24:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/method_override.rb:24:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/executor.rb:14:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/sendfile.rb:110:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/actionpack-7.0.8.1/lib/action_dispatch/middleware/host_authorization.rb:131:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-mini-profiler-3.3.1/lib/mini_profiler.rb:334:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/message_bus-4.3.8/lib/message_bus/rack/middleware.rb:60:in `call'
/var/www/discourse/lib/middleware/request_tracker.rb:291:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.1/lib/rails/engine.rb:530:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.1/lib/rails/railtie.rb:226:in `public_send'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/railties-7.0.8.1/lib/rails/railtie.rb:226:in `method_missing'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/urlmap.rb:74:in `block in call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/urlmap.rb:58:in `each'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rack-2.2.9/lib/rack/urlmap.rb:58:in `call'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/unicorn-6.1.0/lib/unicorn/http_server.rb:634:in `process_client'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/unicorn-6.1.0/lib/unicorn/http_server.rb:739:in `worker_loop'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/unicorn-6.1.0/lib/unicorn/http_server.rb:547:in `spawn_missing_workers'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/unicorn-6.1.0/lib/unicorn/http_server.rb:143:in `start'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/unicorn-6.1.0/bin/unicorn:128:in `<top (required)>'
/var/www/discourse/vendor/bundle/ruby/3.3.0/bin/unicorn:25:in `load'
/var/www/discourse/vendor/bundle/ruby/3.3.0/bin/unicorn:25:in `<main>'

Env

callback_phase method is the one raising this error

def callback_phase # rubocop:disable Metrics/AbcSize, Metrics/CyclomaticComplexity, Metrics/MethodLength, Metrics/PerceivedComplexity
        error = request.params["error_reason"] || request.params["error"]
        if !options.provider_ignores_state && (request.params["state"].to_s.empty? || !secure_compare(request.params["state"], session.delete("omniauth.state")))
          fail!(:csrf_detected, CallbackError.new(:csrf_detected, "CSRF detected"))
        elsif error
          fail!(error, CallbackError.new(request.params["error"], request.params["error_description"] || request.params["error_reason"], request.params["error_uri"]))
        else
          self.access_token = build_access_token
          self.access_token = access_token.refresh! if access_token.expired?
          super
        end
      rescue ::OAuth2::Error, CallbackError => e
        fail!(:invalid_credentials, e)
      rescue ::Timeout::Error, ::Errno::ETIMEDOUT, ::OAuth2::TimeoutError, ::OAuth2::ConnectionError => e
        fail!(:timeout, e)
      rescue ::SocketError => e
        fail!(:failed_to_connect, e)
      end

Can someone please point me in the right direction on how to proceed with the authorization part, playing around with ‘options.provider_ignores_state’ doesn’t seem like a great idea due to security concerns and I’m also not sure that ‘omniauth.state’ is initialized if I’m only hitting the ‘callback’ URL but I’m not familiar enough with OmniAuth to effectively troubleshoot this.

discourse-zoom install/config guide doesn’t explicitly mention the use of ‘discourse-oauth2-basic’ , is there a better way or a more compatible plugin to help me authorize the Meetings SDK

Thanks

1 Like