111 lines
3.1 KiB
Ruby
111 lines
3.1 KiB
Ruby
require 'resolv'
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module Gitlab
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class UrlBlocker
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BlockedUrlError = Class.new(StandardError)
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class << self
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def validate!(url, allow_localhost: false, allow_local_network: true, enforce_user: false, ports: [], protocols: [])
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return true if url.nil?
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begin
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uri = Addressable::URI.parse(url)
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rescue Addressable::URI::InvalidURIError
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raise BlockedUrlError, "URI is invalid"
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end
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# Allow imports from the GitLab instance itself but only from the configured ports
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return true if internal?(uri)
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port = uri.port || uri.default_port
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validate_protocol!(uri.scheme, protocols)
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validate_port!(port, ports) if ports.any?
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validate_user!(uri.user) if enforce_user
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validate_hostname!(uri.hostname)
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begin
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addrs_info = Addrinfo.getaddrinfo(uri.hostname, port, nil, :STREAM)
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rescue SocketError
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return true
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end
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validate_localhost!(addrs_info) unless allow_localhost
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validate_local_network!(addrs_info) unless allow_local_network
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true
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end
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def blocked_url?(*args)
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validate!(*args)
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false
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rescue BlockedUrlError
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true
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end
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private
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def validate_port!(port, ports)
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return if port.blank?
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# Only ports under 1024 are restricted
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return if port >= 1024
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return if ports.include?(port)
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raise BlockedUrlError, "Only allowed ports are #{ports.join(', ')}, and any over 1024"
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end
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def validate_protocol!(protocol, protocols)
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if protocol.blank? || (protocols.any? && !protocols.include?(protocol))
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raise BlockedUrlError, "Only allowed protocols are #{protocols.join(', ')}"
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end
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end
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def validate_user!(value)
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return if value.blank?
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return if value =~ /\A\p{Alnum}/
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raise BlockedUrlError, "Username needs to start with an alphanumeric character"
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end
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def validate_hostname!(value)
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return if value.blank?
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return if value =~ /\A\p{Alnum}/
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raise BlockedUrlError, "Hostname needs to start with an alphanumeric character"
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end
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def validate_localhost!(addrs_info)
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local_ips = ["127.0.0.1", "::1", "0.0.0.0"]
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local_ips.concat(Socket.ip_address_list.map(&:ip_address))
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return if (local_ips & addrs_info.map(&:ip_address)).empty?
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raise BlockedUrlError, "Requests to localhost are not allowed"
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end
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def validate_local_network!(addrs_info)
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return unless addrs_info.any? { |addr| addr.ipv4_private? || addr.ipv6_sitelocal? }
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raise BlockedUrlError, "Requests to the local network are not allowed"
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end
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def internal?(uri)
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internal_web?(uri) || internal_shell?(uri)
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end
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def internal_web?(uri)
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uri.hostname == config.gitlab.host &&
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(uri.port.blank? || uri.port == config.gitlab.port)
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end
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def internal_shell?(uri)
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uri.hostname == config.gitlab_shell.ssh_host &&
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(uri.port.blank? || uri.port == config.gitlab_shell.ssh_port)
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end
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def config
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Gitlab.config
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end
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end
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end
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end
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