lib/bundler/audit/scanner.rb
#
# Copyright (c) 2013-2022 Hal Brodigan (postmodern.mod3 at gmail.com)
#
# bundler-audit is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# bundler-audit is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with bundler-audit. If not, see <https://www.gnu.org/licenses/>.
#
require 'bundler'
require 'bundler/audit/configuration'
require 'bundler/audit/database'
require 'bundler/audit/report'
require 'bundler/audit/results/insecure_source'
require 'bundler/audit/results/unpatched_gem'
require 'bundler/lockfile_parser'
require 'ipaddr'
require 'resolv'
require 'set'
require 'uri'
require 'yaml'
module Bundler
module Audit
#
# Scans a `Gemfile.lock` for security issues.
#
class Scanner
# The advisory database.
#
# @return [Database]
attr_reader :database
# Project root directory
attr_reader :root
# The parsed `Gemfile.lock` from the project.
#
# @return [Bundler::LockfileParser]
attr_reader :lockfile
# The configuration loaded from the `.bundler-audit.yml` file from the
# project.
#
# @return [Hash]
attr_reader :config
#
# Initializes a scanner.
#
# @param [String] root
# The path to the project root.
#
# @param [String] gemfile_lock
# Alternative name for the `Gemfile.lock` file.
#
# @param [Database] database
# The database to scan against.
#
# @param [String] config_dot_file
# The file name of the bundler-audit config file.
#
# @raise [Bundler::GemfileLockNotFound]
# The `gemfile_lock` file could not be found within the `root`
# directory.
#
def initialize(root=Dir.pwd,gemfile_lock='Gemfile.lock',database=Database.new,config_dot_file='.bundler-audit.yml')
@root = File.expand_path(root)
@database = database
gemfile_lock_path = File.join(@root,gemfile_lock)
unless File.file?(gemfile_lock_path)
raise(Bundler::GemfileLockNotFound,"Could not find #{gemfile_lock.inspect} in #{@root.inspect}")
end
@lockfile = LockfileParser.new(File.read(gemfile_lock_path))
config_dot_file_full_path = File.absolute_path(config_dot_file, @root)
@config = if File.exist?(config_dot_file_full_path)
Configuration.load(config_dot_file_full_path)
else
Configuration.new
end
end
#
# Preforms a {#scan} and collects the results into a {Report report}.
#
# @param [Hash] options
# Additional options.
#
# @option options [Array<String>] :ignore
# The advisories to ignore.
#
# @yield [result]
# The given block will be passed the results of the scan.
#
# @yieldparam [Results::InsecureSource, Results::UnpatchedGem] result
# A result from the scan.
#
# @return [Report]
#
# @since 0.8.0
#
def report(options={})
report = Report.new()
scan(options) do |result|
report << result
yield result if block_given?
end
return report
end
#
# Scans the project for issues.
#
# @param [Hash] options
# Additional options.
#
# @option options [Array<String>] :ignore
# The advisories to ignore.
#
# @yield [result]
# The given block will be passed the results of the scan.
#
# @yieldparam [Results::InsecureSource, Results::UnpatchedGem] result
# A result from the scan.
#
# @return [Enumerator]
# If no block is given, an Enumerator will be returned.
#
def scan(options={},&block)
return enum_for(__method__,options) unless block
scan_sources(options,&block)
scan_specs(options,&block)
return self
end
#
# Scans the gem sources in the lockfile.
#
# @param [Hash] options
# Additional options.
#
# @yield [result]
# The given block will be passed the results of the scan.
#
# @yieldparam [Results::InsecureSource] result
# A result from the scan.
#
# @return [Enumerator]
# If no block is given, an Enumerator will be returned.
#
# @api semipublic
#
# @since 0.4.0
#
def scan_sources(options={})
return enum_for(__method__,options) unless block_given?
@lockfile.sources.map do |source|
case source
when Source::Git
case source.uri
when /^git:/, /^http:/
unless internal_source?(source.uri)
yield Results::InsecureSource.new(source.uri)
end
end
when Source::Rubygems
source.remotes.each do |uri|
if (uri.scheme == 'http' && !internal_source?(uri))
yield Results::InsecureSource.new(uri.to_s)
end
end
end
end
end
#
# Scans the gem sources in the lockfile.
#
# @param [Hash] options
# Additional options.
#
# @option options [Array<String>] :ignore
# The advisories to ignore.
#
# @yield [result]
# The given block will be passed the results of the scan.
#
# @yieldparam [Results::UnpatchedGem] result
# A result from the scan.
#
# @return [Enumerator]
# If no block is given, an Enumerator will be returned.
#
# @api semipublic
#
# @since 0.4.0
#
def scan_specs(options={})
return enum_for(__method__,options) unless block_given?
ignore = if options[:ignore]
Set.new(options[:ignore])
else
config.ignore
end
@lockfile.specs.each do |gem|
@database.check_gem(gem) do |advisory|
is_ignored = ignore.intersect?(advisory.identifiers.to_set)
next if is_ignored
yield Results::UnpatchedGem.new(gem,advisory)
end
end
end
private
#
# Determines whether a source is internal.
#
# @param [URI, String] uri
# The URI.
#
# @return [Boolean]
#
def internal_source?(uri)
uri = URI.parse(uri.to_s)
internal_host?(uri.host) if uri.host
end
#
# Determines whether a host is internal.
#
# @param [String] host
# The hostname.
#
# @return [Boolean]
#
def internal_host?(host)
Resolv.getaddresses(host).all? { |ip| internal_ip?(ip) }
rescue URI::Error
false
end
# List of internal IP address ranges.
#
# @see https://tools.ietf.org/html/rfc1918#section-3
# @see https://tools.ietf.org/html/rfc4193#section-8
# @see https://tools.ietf.org/html/rfc6890#section-2.2.2
# @see https://tools.ietf.org/html/rfc6890#section-2.2.3
INTERNAL_SUBNETS = %w[
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16
fc00::/7
127.0.0.0/8
::1/128
].map(&IPAddr.method(:new))
#
# Determines whether an IP is internal.
#
# @param [String] ip
# The IPv4/IPv6 address.
#
# @return [Boolean]
#
def internal_ip?(ip)
INTERNAL_SUBNETS.any? { |subnet| subnet.include?(ip) }
end
end
end
end