221 lines
9.1 KiB
Ruby
221 lines
9.1 KiB
Ruby
#
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# Copyright (c) 2006-2022 Wade Alcorn - wade@bindshell.net
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# Browser Exploitation Framework (BeEF) - http://beefproject.com
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# See the file 'doc/COPYING' for copying permission
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#
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module BeEF
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module Core
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module Models
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module Dns
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# Represents an individual DNS rule.
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class Rule < BeEF::Core::Model
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# Hooks the model's "save" event. Validates pattern/response and generates a rule identifier.
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before_save :check_rule
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self.table_name = 'dns_rules'
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serialize :response, Array
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private
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def check_rule
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validate_pattern(pattern)
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self.callback = format_callback(resource.constantize, response)
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rescue InvalidDnsPatternError, UnknownDnsResourceError, InvalidDnsResponseError => e
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print_error e.message
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throw :halt
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# self.id = BeEF::Core::Crypto.dns_rule_id
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end
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# Verifies that the given pattern is valid (i.e. non-empty, no null's or printable characters).
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def validate_pattern(pattern)
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raise InvalidDnsPatternError unless BeEF::Filters.is_non_empty_string?(pattern) &&
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!BeEF::Filters.has_null?(pattern) &&
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!BeEF::Filters.has_non_printable_char?(pattern)
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end
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# Strict validator which ensures that only an appropriate response is given.
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#
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# @param resource [Resolv::DNS::Resource::IN] resource record type
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# @param response [String, Symbol, Array] response to include in callback
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#
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# @return [String] string representation of callback that can safely be eval'd
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def format_callback(resource, response)
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sym_regex = /^:?(NoError|FormErr|ServFail|NXDomain|NotImp|Refused|NotAuth)$/i
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if resource == Resolv::DNS::Resource::IN::A
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if response.is_a?(String) && BeEF::Filters.is_valid_ip?(response, :ipv4)
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format "t.respond!('%s')", response
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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elsif response.is_a?(Array)
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str1 = "t.respond!('%s');"
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str2 = ''
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response.each do |r|
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raise InvalidDnsResponseError, 'A' unless BeEF::Filters.is_valid_ip?(r, :ipv4)
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str2 << format(str1, r)
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end
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str2
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else
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raise InvalidDnsResponseError, 'A'
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end
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elsif resource == Resolv::DNS::Resource::IN::AAAA
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if response.is_a?(String) && BeEF::Filters.is_valid_ip?(response, :ipv6)
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format "t.respond!('%s')", response
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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elsif response.is_a?(Array)
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str1 = "t.respond!('%s');"
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str2 = ''
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response.each do |r|
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raise InvalidDnsResponseError, 'AAAA' unless BeEF::Filters.is_valid_ip?(r, :ipv6)
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str2 << format(str1, r)
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end
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str2
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else
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raise InvalidDnsResponseError, 'AAAA'
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end
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elsif resource == Resolv::DNS::Resource::IN::CNAME
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if response.is_a?(String) && BeEF::Filters.is_valid_domain?(response)
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format "t.respond!(Resolv::DNS::Name.create('%s'))", response
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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else
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raise InvalidDnsResponseError, 'CNAME'
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end
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elsif resource == Resolv::DNS::Resource::IN::MX
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if response[0].is_a?(Integer) &&
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BeEF::Filters.is_valid_domain?(response[1])
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data = { preference: response[0], exchange: response[1] }
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format "t.respond!(%<preference>d, Resolv::DNS::Name.create('%<exchange>s'))", data
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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else
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raise InvalidDnsResponseError, 'MX'
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end
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elsif resource == Resolv::DNS::Resource::IN::NS
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if response.is_a?(String) && BeEF::Filters.is_valid_domain?(response)
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format "t.respond!(Resolv::DNS::Name.create('%s'))", response
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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elsif response.is_a?(Array)
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str1 = "t.respond!(Resolv::DNS::Name.create('%s'))"
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str2 = ''
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response.each do |r|
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raise InvalidDnsResponseError, 'NS' unless BeEF::Filters.is_valid_domain?(r)
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str2 << format(str1, r)
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end
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str2
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else
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raise InvalidDnsResponseError, 'NS'
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end
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elsif resource == Resolv::DNS::Resource::IN::PTR
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if response.is_a?(String) && BeEF::Filters.is_valid_domain?(response)
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format "t.respond!(Resolv::DNS::Name.create('%s'))", response
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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else
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raise InvalidDnsResponseError, 'PTR'
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end
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elsif resource == Resolv::DNS::Resource::IN::SOA
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if response.is_a?(Array)
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unless BeEF::Filters.is_valid_domain?(response[0]) &&
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BeEF::Filters.is_valid_domain?(response[1]) &&
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response[2].is_a?(Integer) &&
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response[3].is_a?(Integer) &&
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response[4].is_a?(Integer) &&
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response[5].is_a?(Integer) &&
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response[6].is_a?(Integer)
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raise InvalidDnsResponseError, 'SOA'
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end
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data = {
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mname: response[0],
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rname: response[1],
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serial: response[2],
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refresh: response[3],
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retry: response[4],
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expire: response[5],
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minimum: response[6]
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}
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format "t.respond!(Resolv::DNS::Name.create('%<mname>s'), " +
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"Resolv::DNS::Name.create('%<rname>s'), " +
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'%<serial>d, ' +
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'%<refresh>d, ' +
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'%<retry>d, ' +
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'%<expire>d, ' +
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'%<minimum>d)',
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data
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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else
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raise InvalidDnsResponseError, 'SOA'
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end
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elsif resource == Resolv::DNS::Resource::IN::WKS
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if response.is_a?(Array)
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if !BeEF::Filters.is_valid_ip?(resource[0]) &&
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resource[1].is_a?(Integer) &&
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resource[2].is_a?(Integer) && !resource.is_a?(String)
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raise InvalidDnsResponseError, 'WKS'
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end
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data = {
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address: response[0],
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protocol: response[1],
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bitmap: response[2]
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}
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format "t.respond!('%<address>s', %<protocol>d, %<bitmap>d)", data
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elsif (response.is_a?(Symbol) && response.to_s =~ sym_regex) || response =~ sym_regex
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format 't.fail!(:%s)', response.to_sym
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else
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raise InvalidDnsResponseError, 'WKS'
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end
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else
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raise UnknownDnsResourceError
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end
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end
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# Raised when an invalid pattern is given.
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class InvalidDnsPatternError < StandardError
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DEFAULT_MESSAGE = 'Failed to add DNS rule with invalid pattern'
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def initialize(message = nil)
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super(message || DEFAULT_MESSAGE)
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end
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end
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# Raised when a response is not valid for the given DNS resource record.
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class InvalidDnsResponseError < StandardError
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def initialize(message = nil)
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str = 'Failed to add DNS rule with invalid response for %s resource record', message
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message = format str, message unless message.nil?
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super(message)
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end
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end
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# Raised when an unknown DNS resource record is given.
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class UnknownDnsResourceError < StandardError
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DEFAULT_MESSAGE = 'Failed to add DNS rule with unknown resource record'
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def initialize(message = nil)
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super(message || DEFAULT_MESSAGE)
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end
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end
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end
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end
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end
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end
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end
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