Add config option for cookies digest

You can now configure custom digest for cookies in the same way as `serializer`:

  config.action_dispatch.cookies_digest = 'SHA256'

5 files changed, 68 insertions, 5 deletions

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 44b8fa843d..253b647aca 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Add `config.action_dispatch.cookies_digest` option for setting custom
+    digest. The default remains the same - 'SHA1'.
+
+    *Łukasz Strzałkowski*
+
 *   Extract source code for the entire exception stack trace for
     better debugging and diagnosis.
 
diff --git a/actionpack/lib/action_dispatch/middleware/cookies.rb b/actionpack/lib/action_dispatch/middleware/cookies.rb
index ac9e5effe2..0f088c5539 100644
--- a/actionpack/lib/action_dispatch/middleware/cookies.rb
+++ b/actionpack/lib/action_dispatch/middleware/cookies.rb
@@ -90,6 +90,7 @@ module ActionDispatch
     SECRET_TOKEN = "action_dispatch.secret_token".freeze
     SECRET_KEY_BASE = "action_dispatch.secret_key_base".freeze
     COOKIES_SERIALIZER = "action_dispatch.cookies_serializer".freeze
+    COOKIES_DIGEST = "action_dispatch.cookies_digest".freeze
 
     # Cookies can typically store 4096 bytes.
     MAX_COOKIE_SIZE = 4096
@@ -212,7 +213,8 @@ module ActionDispatch
           secret_token: env[SECRET_TOKEN],
           secret_key_base: env[SECRET_KEY_BASE],
           upgrade_legacy_signed_cookies: env[SECRET_TOKEN].present? && env[SECRET_KEY_BASE].present?,
-          serializer: env[COOKIES_SERIALIZER]
+          serializer: env[COOKIES_SERIALIZER],
+          digest: env[COOKIES_DIGEST]
         }
       end
 
@@ -441,6 +443,10 @@ module ActionDispatch
             serializer
           end
         end
+
+        def digest
+          @options[:digest] || 'SHA1'
+        end
     end
 
     class SignedCookieJar #:nodoc:
@@ -451,7 +457,7 @@ module ActionDispatch
         @parent_jar = parent_jar
         @options = options
         secret = key_generator.generate_key(@options[:signed_cookie_salt])
-        @verifier = ActiveSupport::MessageVerifier.new(secret, serializer: NullSerializer)
+        @verifier = ActiveSupport::MessageVerifier.new(secret, digest: digest, serializer: NullSerializer)
       end
 
       def [](name)
@@ -508,7 +514,7 @@ module ActionDispatch
         @options = options
         secret = key_generator.generate_key(@options[:encrypted_cookie_salt])
         sign_secret = key_generator.generate_key(@options[:encrypted_signed_cookie_salt])
-        @encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret, serializer: NullSerializer)
+        @encryptor = ActiveSupport::MessageEncryptor.new(secret, sign_secret, digest: digest, serializer: NullSerializer)
       end
 
       def [](name)
diff --git a/actionpack/test/dispatch/cookies_test.rb b/actionpack/test/dispatch/cookies_test.rb
index 0f145666d1..b40c21c067 100644
--- a/actionpack/test/dispatch/cookies_test.rb
+++ b/actionpack/test/dispatch/cookies_test.rb
@@ -369,6 +369,35 @@ class CookiesTest < ActionController::TestCase
     assert_equal 'Jamie', @controller.send(:cookies).permanent[:user_name]
   end
 
+  def test_signed_cookie_using_default_digest
+    get :set_signed_cookie
+    cookies = @controller.send :cookies
+    assert_not_equal 45, cookies[:user_id]
+    assert_equal 45, cookies.signed[:user_id]
+
+    key_generator = @request.env["action_dispatch.key_generator"]
+    signed_cookie_salt = @request.env["action_dispatch.signed_cookie_salt"]
+    secret = key_generator.generate_key(signed_cookie_salt)
+
+    verifier = ActiveSupport::MessageVerifier.new(secret, serializer: Marshal, digest: 'SHA1')
+    assert_equal verifier.generate(45), cookies[:user_id]
+  end
+
+  def test_signed_cookie_using_custom_digest
+    @request.env["action_dispatch.cookies_digest"] = 'SHA256'
+    get :set_signed_cookie
+    cookies = @controller.send :cookies
+    assert_not_equal 45, cookies[:user_id]
+    assert_equal 45, cookies.signed[:user_id]
+
+    key_generator = @request.env["action_dispatch.key_generator"]
+    signed_cookie_salt = @request.env["action_dispatch.signed_cookie_salt"]
+    secret = key_generator.generate_key(signed_cookie_salt)
+
+    verifier = ActiveSupport::MessageVerifier.new(secret, serializer: Marshal, digest: 'SHA256')
+    assert_equal verifier.generate(45), cookies[:user_id]
+  end
+
   def test_signed_cookie_using_default_serializer
     get :set_signed_cookie
     cookies = @controller.send :cookies
@@ -481,6 +510,27 @@ class CookiesTest < ActionController::TestCase
     assert_equal 'bar was dumped and loaded', cookies.encrypted[:foo]
   end
 
+  def test_encrypted_cookie_using_custom_digest
+    @request.env["action_dispatch.cookies_digest"] = 'SHA256'
+    get :set_encrypted_cookie
+    cookies = @controller.send :cookies
+    assert_not_equal 'bar', cookies[:foo]
+    assert_equal 'bar', cookies.encrypted[:foo]
+
+    sign_secret = @request.env["action_dispatch.key_generator"].generate_key(@request.env["action_dispatch.encrypted_signed_cookie_salt"])
+
+    sha1_verifier   = ActiveSupport::MessageVerifier.new(sign_secret, serializer: ActionDispatch::Cookies::NullSerializer, digest: 'SHA1')
+    sha256_verifier = ActiveSupport::MessageVerifier.new(sign_secret, serializer: ActionDispatch::Cookies::NullSerializer, digest: 'SHA256')
+
+    assert_raises(ActiveSupport::MessageVerifier::InvalidSignature) do
+      sha1_verifier.verify(cookies[:foo])
+    end
+
+    assert_nothing_raised do
+      sha256_verifier.verify(cookies[:foo])
+    end
+  end
+
   def test_encrypted_cookie_using_hybrid_serializer_can_migrate_marshal_dumped_value_to_json
     @request.env["action_dispatch.cookies_serializer"] = :hybrid
 
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb
index b019ad0dec..92ab6fe648 100644
--- a/activesupport/lib/active_support/message_encryptor.rb
+++ b/activesupport/lib/active_support/message_encryptor.rb
@@ -40,6 +40,7 @@ module ActiveSupport
     # Options:
     # * <tt>:cipher</tt>     - Cipher to use. Can be any cipher returned by
     #   <tt>OpenSSL::Cipher.ciphers</tt>. Default is 'aes-256-cbc'.
+    # * <tt>:digest</tt> - String of digest to use for signing. Default is +SHA1+.
     # * <tt>:serializer</tt> - Object serializer to use. Default is +Marshal+.
     def initialize(secret, *signature_key_or_options)
       options = signature_key_or_options.extract_options!
@@ -47,7 +48,7 @@ module ActiveSupport
       @secret = secret
       @sign_secret = sign_secret
       @cipher = options[:cipher] || 'aes-256-cbc'
-      @verifier = MessageVerifier.new(@sign_secret || @secret, :serializer => NullSerializer)
+      @verifier = MessageVerifier.new(@sign_secret || @secret, digest: options[:digest] || 'SHA1', serializer: NullSerializer)
       @serializer = options[:serializer] || Marshal
     end
 
diff --git a/railties/lib/rails/application.rb b/railties/lib/rails/application.rb
index 61639be7c6..6a4660bad0 100644
--- a/railties/lib/rails/application.rb
+++ b/railties/lib/rails/application.rb
@@ -256,7 +256,8 @@ module Rails
           "action_dispatch.signed_cookie_salt" => config.action_dispatch.signed_cookie_salt,
           "action_dispatch.encrypted_cookie_salt" => config.action_dispatch.encrypted_cookie_salt,
           "action_dispatch.encrypted_signed_cookie_salt" => config.action_dispatch.encrypted_signed_cookie_salt,
-          "action_dispatch.cookies_serializer" => config.action_dispatch.cookies_serializer
+          "action_dispatch.cookies_serializer" => config.action_dispatch.cookies_serializer,
+          "action_dispatch.cookies_digest" => config.action_dispatch.cookies_digest
         })
       end
     end