Add DDoS protection (#308)

* Add and configure rack-attack gem
* Limit number of tenant registrations with same email address
* Limit requests to tenants#create by IP

Gemfile

@@ -41,6 +41,9 @@ gem 'react-rails', '2.6.2'
 # Pagination
 gem 'kaminari', '1.2.2'
 
+# DDoS protection
+gem 'rack-attack', '6.7.0'
+
 group :development, :test do
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
 

Gemfile.lock

@@ -170,6 +170,8 @@ GEM
       activesupport (>= 3.0.0)
     racc (1.7.3)
     rack (2.2.8.1)
+    rack-attack (6.7.0)
+      rack (>= 1.0, < 4)
     rack-test (2.1.0)
       rack (>= 1.3)
     rails (6.1.7.7)
@@ -293,6 +295,7 @@ DEPENDENCIES
   pg (= 1.3.5)
   puma (= 5.6.8)
   pundit (= 2.2.0)
+  rack-attack (= 6.7.0)
   rails (= 6.1.7.7)
   rake (= 12.3.3)
   react-rails (= 2.6.2)

app/controllers/tenants_controller.rb

@@ -29,6 +29,10 @@ class TenantsController < ApplicationController
         @tenant.status = "active" # no need to verify email address if logged in with oauth
       end
 
+      # Check how many times this email registered a tenant
+      already_registered_tenants = User.unscoped.where(email: params[:user][:email], role: User.roles[:owner]).count
+      raise "Too many tenants registered by email" unless already_registered_tenants < 3
+
       @tenant.save!
       Current.tenant = @tenant
 

config/initializers/rack_attack.rb

@@ -0,0 +1,73 @@
+class Rack::Attack
+  ### Throttle Spammy Clients ###
+
+  # If any single client IP is making tons of requests, then they're
+  # probably malicious or a poorly-configured scraper. Either way, they
+  # don't deserve to hog all of the app server's CPU. Cut them off!
+  #
+  # Note: If you're serving assets through rack, those requests may be
+  # counted by rack-attack and this throttle may be activated too
+  # quickly. If so, enable the condition to exclude them from tracking.
+
+  # Throttle all requests by IP (60rpm)
+  #
+  # Key: "rack::attack:#{Time.now.to_i/:period}:req/ip:#{req.ip}"
+  throttle('req/ip', limit: 300, period: 5.minutes) do |req|
+    req.ip # unless req.path.start_with?('/assets')
+  end
+
+  ### Prevent Brute-Force Login Attacks ###
+
+  # The most common brute-force login attack is a brute-force password
+  # attack where an attacker simply tries a large number of emails and
+  # passwords to see if any credentials match.
+  #
+  # Another common method of attack is to use a swarm of computers with
+  # different IPs to try brute-forcing a password for a specific account.
+
+  # Throttle POST requests to /users/sign_in by IP address
+  #
+  # Key: "rack::attack:#{Time.now.to_i/:period}:logins/ip:#{req.ip}"
+  throttle('logins/ip', limit: 5, period: 20.seconds) do |req|
+    if req.path == '/users/sign_in' && req.post?
+      req.ip
+    end
+  end
+
+  # Throttle POST requests to /users/sign_in by email param
+  #
+  # Key: "rack::attack:#{Time.now.to_i/:period}:logins/email:#{normalized_email}"
+  #
+  # Note: This creates a problem where a malicious user could intentionally
+  # throttle logins for another user and force their login requests to be
+  # denied, but that's not very common and shouldn't happen to you. (Knock
+  # on wood!)
+  throttle('logins/email', limit: 5, period: 20.seconds) do |req|
+    if req.path == '/users/sign_in' && req.post?
+      # Normalize the email, using the same logic as your authentication process, to
+      # protect against rate limit bypasses. Return the normalized email if present, nil otherwise.
+      req.params['email'].to_s.downcase.gsub(/\s+/, "").presence
+    end
+  end
+
+  # Throttle POST requests to /tenants by IP address
+  throttle('tenant_signups/ip', limit: 5, period: 20.seconds) do |req|
+    if req.path == '/tenants' && req.post?
+      req.ip
+    end
+  end
+
+  ### Custom Throttle Response ###
+
+  # By default, Rack::Attack returns an HTTP 429 for throttled responses,
+  # which is just fine.
+  #
+  # If you want to return 503 so that the attacker might be fooled into
+  # believing that they've successfully broken your app (or you just want to
+  # customize the response), then uncomment these lines.
+  # self.throttled_response = lambda do |env|
+  #  [ 503,  # status
+  #    {},   # headers
+  #    ['']] # body
+  # end
+end