From 951e997b26cb5bf93539a22221efda97ad70079e Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Wed, 24 Jun 2020 00:21:03 +0200
Subject: [PATCH] Change rate limits for various paths

- Rate limit login attempts by target account
- Rate limit password resets and e-mail re-confirmations by target account
- Rate limit sign-up/login attempts, password resets, and e-mail re-confirmations by IP like before
---
 config/initializers/rack_attack.rb         | 37 +++++++++++++++-------
 config/initializers/rack_attack_logging.rb |  1 +
 2 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/config/initializers/rack_attack.rb b/config/initializers/rack_attack.rb
index 09458c540..cd29afac5 100644
--- a/config/initializers/rack_attack.rb
+++ b/config/initializers/rack_attack.rb
@@ -38,15 +38,6 @@ class Rack::Attack
     end
   end
 
-  PROTECTED_PATHS = %w(
-    /auth/sign_in
-    /auth
-    /auth/password
-    /auth/confirmation
-  ).freeze
-
-  PROTECTED_PATHS_REGEX = Regexp.union(PROTECTED_PATHS.map { |path| /\A#{Regexp.escape(path)}/ })
-
   Rack::Attack.safelist('allow from localhost') do |req|
     req.remote_ip == '127.0.0.1' || req.remote_ip == '::1'
   end
@@ -86,8 +77,32 @@ class Rack::Attack
     req.authenticated_user_id if (req.post? && req.path =~ API_DELETE_REBLOG_REGEX) || (req.delete? && req.path =~ API_DELETE_STATUS_REGEX)
   end
 
-  throttle('protected_paths', limit: 25, period: 5.minutes) do |req|
-    req.remote_ip if req.post? && req.path =~ PROTECTED_PATHS_REGEX
+  throttle('throttle_sign_up_attempts/ip', limit: 25, period: 5.minutes) do |req|
+    req.remote_ip if req.post? && req.path == '/auth'
+  end
+
+  throttle('throttle_password_resets/ip', limit: 25, period: 5.minutes) do |req|
+    req.remote_ip if req.post? && req.path == '/auth/password'
+  end
+
+  throttle('throttle_password_resets/email', limit: 5, period: 30.minutes) do |req|
+    req.params.dig('user', 'email').presence if req.post? && req.path == '/auth/password'
+  end
+
+  throttle('throttle_email_confirmations/ip', limit: 25, period: 5.minutes) do |req|
+    req.remote_ip if req.post? && req.path == '/auth/confirmation'
+  end
+
+  throttle('throttle_email_confirmations/email', limit: 5, period: 30.minutes) do |req|
+    req.params.dig('user', 'email').presence if req.post? && req.path == '/auth/password'
+  end
+
+  throttle('throttle_login_attempts/ip', limit: 25, period: 5.minutes) do |req|
+    req.remote_ip if req.post? && req.path == '/auth/sign_in'
+  end
+
+  throttle('throttle_login_attempts/email', limit: 25, period: 1.hour) do |req|
+    req.session[:attempt_user_id] || req.params.dig('user', 'email').presence if req.post? && req.path == '/auth/sign_in'
   end
 
   self.throttled_response = lambda do |env|
diff --git a/config/initializers/rack_attack_logging.rb b/config/initializers/rack_attack_logging.rb
index c30bd8a64..ab4822e96 100644
--- a/config/initializers/rack_attack_logging.rb
+++ b/config/initializers/rack_attack_logging.rb
@@ -2,5 +2,6 @@ ActiveSupport::Notifications.subscribe(/rack_attack/) do |_name, _start, _finish
   req = payload[:request]
 
   next unless [:throttle, :blacklist].include? req.env['rack.attack.match_type']
+
   Rails.logger.info("Rate limit hit (#{req.env['rack.attack.match_type']}): #{req.ip} #{req.request_method} #{req.fullpath}")
 end