# frozen_string_literal: true
require "rubygems/installer"
module Bundler
class RubyGemsGemInstaller < Gem::Installer
unless respond_to?(:at)
def self.at(*args)
new(*args)
end
end
def check_executable_overwrite(filename)
# Bundler needs to install gems regardless of binstub overwriting
end
def pre_install_checks
super && validate_bundler_checksum(options[:bundler_expected_checksum])
end
def build_extensions
extension_cache_path = options[:bundler_extension_cache_path]
return super unless extension_cache_path && extension_dir = Bundler.rubygems.spec_extension_dir(spec)
extension_dir = Pathname.new(extension_dir)
build_complete = SharedHelpers.filesystem_access(extension_cache_path.join("gem.build_complete"), :read, &:file?)
if build_complete && !options[:force]
SharedHelpers.filesystem_access(extension_dir.parent, &:mkpath)
SharedHelpers.filesystem_access(extension_cache_path) do
FileUtils.cp_r extension_cache_path, spec.extension_dir
end
else
super
if extension_dir.directory? # not made for gems without extensions
SharedHelpers.filesystem_access(extension_cache_path.parent, &:mkpath)
SharedHelpers.filesystem_access(extension_cache_path) do
FileUtils.cp_r extension_dir, extension_cache_path
end
end
end
end
private
def validate_bundler_checksum(checksum)
return true if Bundler.settings[:disable_checksum_validation]
return true unless checksum
return true unless source = @package.instance_variable_get(:@gem)
return true unless source.respond_to?(:with_read_io)
digest = source.with_read_io do |io|
digest = SharedHelpers.digest(:SHA256).new
digest << io.read(16_384) until io.eof?
io.rewind
send(checksum_type(checksum), digest)
end
unless digest == checksum
raise SecurityError, <<-MESSAGE
Bundler cannot continue installing #{spec.name} (#{spec.version}).
The checksum for the downloaded `#{spec.full_name}.gem` does not match \
the checksum given by the server. This means the contents of the downloaded \
gem is different from what was uploaded to the server, and could be a potential security issue.
To resolve this issue:
1. delete the downloaded gem located at: `#{spec.gem_dir}/#{spec.full_name}.gem`
2. run `bundle install`
If you wish to continue installing the downloaded gem, and are certain it does not pose a \
security issue despite the mismatching checksum, do the following:
1. run `bundle config disable_checksum_validation true` to turn off checksum verification
2. run `bundle install`
(More info: The expected SHA256 checksum was #{checksum.inspect}, but the \
checksum for the downloaded gem was #{digest.inspect}.)
MESSAGE
end
true
end
def checksum_type(checksum)
case checksum.length
when 64 then :hexdigest!
when 44 then :base64digest!
else raise InstallError, "The given checksum for #{spec.full_name} (#{checksum.inspect}) is not a valid SHA256 hexdigest nor base64digest"
end
end
def hexdigest!(digest)
digest.hexdigest!
end
def base64digest!(digest)
if digest.respond_to?(:base64digest!)
digest.base64digest!
else
[digest.digest!].pack("m0")
end
end
end
end
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