Block link-local addresses in URLBlocker

Closes https://gitlab.com/gitlab-com/migration/issues/766

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/gitlab/url_blocker.rb b/lib/gitlab/url_blocker.rb
index 38be75b7482..3b483f27e70 100644
--- a/lib/gitlab/url_blocker.rb
+++ b/lib/gitlab/url_blocker.rb
@@ -31,6 +31,7 @@ module Gitlab
 
         validate_localhost!(addrs_info) unless allow_localhost
         validate_local_network!(addrs_info) unless allow_local_network
+        validate_link_local!(addrs_info) unless allow_local_network
 
         true
       end
@@ -89,6 +90,13 @@ module Gitlab
         raise BlockedUrlError, "Requests to the local network are not allowed"
       end
 
+      def validate_link_local!(addrs_info)
+        netmask = IPAddr.new('169.254.0.0/16')
+        return unless addrs_info.any? { |addr| addr.ipv6_linklocal? || netmask.include?(addr.ip_address) }
+
+        raise BlockedUrlError, "Requests to the link local network are not allowed"
+      end
+
       def internal?(uri)
         internal_web?(uri) || internal_shell?(uri)
       end