Fix CSRF vulnerability reported by Egor Homakov, fixes sidekiq#2422

Changes.md

@@ -1,7 +1,14 @@
-HEAD
+3.4.2
 -----------
 
 - Safer display of job data in Web UI [#2405]
+- Fix CSRF vulenerability in Web UI, thanks to Egor Homakov for
+  reporting. [#2422] If you are running the Web UI as a standalone Rack app,
+  ensure you have a [session middleware
+configured](https://github.com/mperham/sidekiq/wiki/Monitoring#standalone):
+```ruby
+use Rack::Session::Cookie, :secret => "some unique secret string here"
+```
 
 3.4.1
 -----------

lib/sidekiq/version.rb

@@ -1,3 +1,3 @@
 module Sidekiq
-  VERSION = "3.4.1"
+  VERSION = "3.4.2"
 end

lib/sidekiq/web.rb

@@ -11,6 +11,8 @@ module Sidekiq
   class Web < Sinatra::Base
     include Sidekiq::Paginator
 
+    use Rack::Protection, :use => :authenticity_token unless ENV['RACK_ENV'] == 'test'
+
     set :root, File.expand_path(File.dirname(__FILE__) + "/../../web")
     set :public_folder, proc { "#{root}/assets" }
     set :views, proc { "#{root}/views" }

lib/sidekiq/web_helpers.rb

@@ -173,6 +173,10 @@ def display_args(args, truncate_after_chars = 2000)
       end.join(", ")
     end
 
+    def tkn
+      session[:csrf]
+    end
+
     def to_display(arg)
       begin
         arg.inspect

myapp/simple.ru

@@ -0,0 +1,13 @@
+# Easiest way to run Sidekiq::Web.
+# Run with "bundle exec rackup simple.ru"
+
+require 'sidekiq'
+
+# A Web process always runs as client, no need to configure server
+Sidekiq.configure_client do |config|
+  config.redis = { url: 'redis://localhost:6379/0', size: 1 }
+end
+
+require 'sidekiq/web'
+use Rack::Session::Cookie, :secret => "some unique secret string here"
+run Sidekiq::Web

web/views/busy.erb

@@ -4,6 +4,7 @@
   </div>
   <div class="col-sm-4 pull-right">
     <form method="POST" style="margin-top: 20px; margin-bottom: 10px;">
+      <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
       <div class="btn-group pull-right">
         <button class="btn btn-warn" type="submit" name="quiet" value="1"><%= t('QuietAll') %></button>
         <button class="btn btn-danger" type="submit" name="stop" value="1"><%= t('StopAll') %></button>
@@ -40,6 +41,7 @@
         <td>
           <div class="btn-group pull-right">
             <form method="POST">
+              <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
               <input type="hidden" name="identity" value="<%= process['identity'] %>"/>
               <button class="btn btn-warn" type="submit" name="quiet" value="1"><%= t('Quiet') %></button>
               <button class="btn btn-danger" type="submit" name="stop" value="1"><%= t('Stop') %></button>

web/views/dead.erb

@@ -27,6 +27,7 @@
 </div>
 
 <form class="form-horizontal" action="<%= root_path %>morgue/<%= job_params(@dead, @dead.score) %>" method="post">
+  <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
   <a class="btn btn-default" href="<%= root_path %>morgue"><%= t('GoBack') %></a>
   <input class="btn btn-primary" type="submit" name="retry" value="<%= t('RetryNow') %>" />
   <input class="btn btn-danger" type="submit" name="delete" value="<%= t('Delete') %>" />

web/views/morgue.erb

@@ -12,6 +12,7 @@
 
 <% if @dead.size > 0 %>
   <form action="<%= root_path %>morgue" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <div class="table_container">
       <table class="table table-striped table-bordered table-white">
         <thead>
@@ -57,9 +58,11 @@
   </form>
 
   <form action="<%= root_path %>morgue/all/delete" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <input class="btn btn-danger btn-xs pull-right" type="submit" name="delete" value="<%= t('DeleteAll') %>" data-confirm="<%= t('AreYouSure') %>" />
   </form>
   <form action="<%= root_path %>morgue/all/retry" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <input class="btn btn-danger btn-xs pull-right" type="submit" name="retry" value="<%= t('RetryAll') %>" data-confirm="<%= t('AreYouSure') %>" />
   </form>
 

web/views/queue.erb

@@ -33,6 +33,7 @@
         </td>
         <td>
           <form action="<%= root_path %>queues/<%= @name %>/delete" method="post">
+            <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
             <input name="key_val" value="<%= h Sidekiq.dump_json(msg.item) %>" type="hidden" />
             <input class="btn btn-danger btn-xs" type="submit" name="delete" value="<%= t('Delete') %>" data-confirm="<%= t('AreYouSure') %>" />
           </form>

web/views/queues.erb

@@ -18,6 +18,7 @@
         <td><%= number_with_delimiter(queue.size) %> </td>
         <td width="20%">
           <form action="<%=root_path %>queues/<%= queue.name %>" method="post">
+            <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
             <input class="btn btn-danger btn-xs" type="submit" name="delete" value="<%= t('Delete') %>" data-confirm="<%= t('AreYouSureDeleteQueue', :queue => h(queue.name)) %>" />
           </form>
         </td>

web/views/retries.erb

@@ -12,6 +12,7 @@
 
 <% if @retries.size > 0 %>
   <form action="<%= root_path %>retries" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <div class="table_container">
       <table class="table table-striped table-bordered table-white">
         <thead>
@@ -60,9 +61,11 @@
   </form>
 
   <form action="<%= root_path %>retries/all/delete" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <input class="btn btn-danger btn-xs pull-right" type="submit" name="delete" value="<%= t('DeleteAll') %>" data-confirm="<%= t('AreYouSure') %>" />
   </form>
   <form action="<%= root_path %>retries/all/retry" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <input class="btn btn-danger btn-xs pull-right" type="submit" name="retry" value="<%= t('RetryAll') %>" data-confirm="<%= t('AreYouSure') %>" />
   </form>
 

web/views/retry.erb

@@ -27,6 +27,7 @@
 </div>
 
 <form class="form-horizontal" action="<%= root_path %>retries/<%= job_params(@retry, @retry.score) %>" method="post">
+  <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
   <a class="btn btn-default" href="<%= root_path %>retries"><%= t('GoBack') %></a>
   <input class="btn btn-primary" type="submit" name="retry" value="<%= t('RetryNow') %>" />
   <input class="btn btn-danger" type="submit" name="delete" value="<%= t('Delete') %>" />

web/views/scheduled.erb

@@ -13,6 +13,7 @@
 <% if @scheduled.size > 0 %>
 
   <form action="<%= root_path %>scheduled" method="post">
+    <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
     <div class="table_container">
       <table class="table table-striped table-bordered table-white">
         <thead>

web/views/scheduled_job_info.erb

@@ -1,6 +1,7 @@
 <%= erb :_job_info, :locals => {:job => @job, :type => :scheduled} %>
 
 <form class="form-horizontal" action="<%= root_path %>scheduled/<%= job_params(@job, @job.score) %>" method="post">
+  <input type="hidden" name="authenticity_token" value="<%= tkn %>"/>
   <a class="btn btn-default" href="<%= root_path %>scheduled"><%= t('GoBack') %></a>
   <input class="btn btn-primary" type="submit" name="add_to_queue" value="<%= t('AddToQueue') %>" />
   <input class="btn btn-danger" type="submit" name="delete" value="<%= t('Delete') %>" />