From fa487763d98ccf9c3e66fdb44f09af5c37a50fe5 Mon Sep 17 00:00:00 2001 From: Vipul A M Date: Tue, 12 Apr 2016 02:41:06 +0530 Subject: Changed default behaviour of `ActiveSupport::SecurityUtils.secure_compare`, to make it not leak length information even for variable length string. Renamed old `ActiveSupport::SecurityUtils.secure_compare` to `fixed_length_secure_compare`, and started raising `ArgumentError` in case of length mismatch of passed strings. --- actionpack/lib/action_controller/metal/http_authentication.rb | 11 ++++------- .../lib/action_controller/metal/request_forgery_protection.rb | 4 ++-- 2 files changed, 6 insertions(+), 9 deletions(-) (limited to 'actionpack/lib/action_controller') diff --git a/actionpack/lib/action_controller/metal/http_authentication.rb b/actionpack/lib/action_controller/metal/http_authentication.rb index d8bc895265..09df39db1f 100644 --- a/actionpack/lib/action_controller/metal/http_authentication.rb +++ b/actionpack/lib/action_controller/metal/http_authentication.rb @@ -70,10 +70,10 @@ module ActionController before_action(options.except(:name, :password, :realm)) do authenticate_or_request_with_http_basic(options[:realm] || "Application") do |name, password| # This comparison uses & so that it doesn't short circuit and - # uses `variable_size_secure_compare` so that length information + # uses `secure_compare` so that length information # isn't leaked. - ActiveSupport::SecurityUtils.variable_size_secure_compare(name, options[:name]) & - ActiveSupport::SecurityUtils.variable_size_secure_compare(password, options[:password]) + ActiveSupport::SecurityUtils.secure_compare(name, options[:name]) & + ActiveSupport::SecurityUtils.secure_compare(password, options[:password]) end end end @@ -348,10 +348,7 @@ module ActionController # authenticate_or_request_with_http_token do |token, options| # # Compare the tokens in a time-constant manner, to mitigate # # timing attacks. - # ActiveSupport::SecurityUtils.secure_compare( - # ::Digest::SHA256.hexdigest(token), - # ::Digest::SHA256.hexdigest(TOKEN) - # ) + # ActiveSupport::SecurityUtils.secure_compare(token, TOKEN) # end # end # end diff --git a/actionpack/lib/action_controller/metal/request_forgery_protection.rb b/actionpack/lib/action_controller/metal/request_forgery_protection.rb index 5051c02a62..13662fc021 100644 --- a/actionpack/lib/action_controller/metal/request_forgery_protection.rb +++ b/actionpack/lib/action_controller/metal/request_forgery_protection.rb @@ -353,7 +353,7 @@ module ActionController #:nodoc: end def compare_with_real_token(token, session) # :doc: - ActiveSupport::SecurityUtils.secure_compare(token, real_csrf_token(session)) + ActiveSupport::SecurityUtils.fixed_length_secure_compare(token, real_csrf_token(session)) end def valid_per_form_csrf_token?(token, session) # :doc: @@ -364,7 +364,7 @@ module ActionController #:nodoc: request.request_method ) - ActiveSupport::SecurityUtils.secure_compare(token, correct_token) + ActiveSupport::SecurityUtils.fixed_length_secure_compare(token, correct_token) else false end -- cgit v1.2.3