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# This override allows passing `@hostname_override` to the SNI protocol,
# which is used to lookup the correct SSL certificate in the
# request handshake process.
#
# Given we've forced the HTTP request to be sent to the resolved
# IP address in a few scenarios (e.g.: `Gitlab::HTTP` through
# `Gitlab::UrlBlocker.validate!`), we need to provide the _original_
# hostname via SNI in order to have a clean connection setup.
#
# This is ultimately needed in order to avoid DNS rebinding attacks
# through HTTP requests.
#
class OpenSSL::SSL::SSLContext
attr_accessor :hostname_override
end
class OpenSSL::SSL::SSLSocket
module HostnameOverride
# rubocop: disable Gitlab/ModuleWithInstanceVariables
def hostname=(hostname)
super(@context.hostname_override || hostname)
end
def post_connection_check(hostname)
super(@context.hostname_override || hostname)
end
# rubocop: enable Gitlab/ModuleWithInstanceVariables
end
prepend HostnameOverride
end
class Net::HTTP
attr_accessor :hostname_override
SSL_IVNAMES << :@hostname_override
SSL_ATTRIBUTES << :hostname_override
module HostnameOverride
def addr_port
return super unless hostname_override
addr = hostname_override
default_port = use_ssl? ? Net::HTTP.https_default_port : Net::HTTP.http_default_port
default_port == port ? addr : "#{addr}:#{port}"
end
end
prepend HostnameOverride
end
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