jvazquez-r7
523 lines
16 KiB
Ruby
523 lines
16 KiB
Ruby
# -*- coding: binary -*-
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require 'uri'
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require 'digest'
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require 'rex/proto/ntlm/crypt'
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require 'rex/proto/ntlm/constants'
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require 'rex/proto/ntlm/utils'
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require 'rex/proto/ntlm/exceptions'
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module Msf
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###
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#
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# This module provides methods for acting as an HTTP client when
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# exploiting an HTTP server.
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#
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###
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module Exploit::Remote::HttpClient
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include Msf::Auxiliary::Report
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include Exploit::Remote::NTLM::Client
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#
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# Constants
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#
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NTLM_CRYPT = Rex::Proto::NTLM::Crypt
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NTLM_CONST = Rex::Proto::NTLM::Constants
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NTLM_UTILS = Rex::Proto::NTLM::Utils
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NTLM_XCEPT = Rex::Proto::NTLM::Exceptions
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#
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# Initializes an exploit module that exploits a vulnerability in an HTTP
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# server.
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#
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def initialize(info = {})
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super
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register_options(
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[
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Opt::RHOST,
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Opt::RPORT(80),
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OptString.new('VHOST', [ false, "HTTP server virtual host" ]),
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Opt::Proxies
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], self.class
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)
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register_advanced_options(
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[
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OptString.new('UserAgent', [false, 'The User-Agent header to use for all requests',
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Rex::Proto::Http::Client::DefaultUserAgent
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]),
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OptString.new('USERNAME', [false, 'The HTTP username to specify for authentication', '']),
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OptString.new('PASSWORD', [false, 'The HTTP password to specify for authentication', '']),
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OptBool.new('DigestAuthIIS', [false, 'Conform to IIS, should work for most servers. Only set to false for non-IIS servers', true]),
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OptBool.new('SSL', [ false, 'Negotiate SSL for outgoing connections', false]),
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OptEnum.new('SSLVersion', [ false, 'Specify the version of SSL that should be used', 'SSL3', ['SSL2', 'SSL3', 'TLS1']]),
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OptBool.new('FingerprintCheck', [ false, 'Conduct a pre-exploit fingerprint verification', true]),
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OptString.new('DOMAIN', [ true, 'The domain to use for windows authentification', 'WORKSTATION'])
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], self.class
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)
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register_evasion_options(
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[
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OptEnum.new('HTTP::uri_encode_mode', [false, 'Enable URI encoding', 'hex-normal', ['none', 'hex-normal', 'hex-all', 'hex-random', 'u-normal', 'u-all', 'u-random']]),
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OptBool.new('HTTP::uri_full_url', [false, 'Use the full URL for all HTTP requests', false]),
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OptInt.new('HTTP::pad_method_uri_count', [false, 'How many whitespace characters to use between the method and uri', 1]),
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OptInt.new('HTTP::pad_uri_version_count', [false, 'How many whitespace characters to use between the uri and version', 1]),
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OptEnum.new('HTTP::pad_method_uri_type', [false, 'What type of whitespace to use between the method and uri', 'space', ['space', 'tab', 'apache']]),
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OptEnum.new('HTTP::pad_uri_version_type', [false, 'What type of whitespace to use between the uri and version', 'space', ['space', 'tab', 'apache']]),
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OptBool.new('HTTP::method_random_valid', [false, 'Use a random, but valid, HTTP method for request', false]),
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OptBool.new('HTTP::method_random_invalid', [false, 'Use a random invalid, HTTP method for request', false]),
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OptBool.new('HTTP::method_random_case', [false, 'Use random casing for the HTTP method', false]),
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OptBool.new('HTTP::uri_dir_self_reference', [false, 'Insert self-referential directories into the uri', false]),
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OptBool.new('HTTP::uri_dir_fake_relative', [false, 'Insert fake relative directories into the uri', false]),
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OptBool.new('HTTP::uri_use_backslashes', [false, 'Use back slashes instead of forward slashes in the uri ', false]),
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OptBool.new('HTTP::pad_fake_headers', [false, 'Insert random, fake headers into the HTTP request', false]),
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OptInt.new('HTTP::pad_fake_headers_count', [false, 'How many fake headers to insert into the HTTP request', 0]),
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OptBool.new('HTTP::pad_get_params', [false, 'Insert random, fake query string variables into the request', false]),
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OptInt.new('HTTP::pad_get_params_count', [false, 'How many fake query string variables to insert into the request', 16]),
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OptBool.new('HTTP::pad_post_params', [false, 'Insert random, fake post variables into the request', false]),
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OptInt.new('HTTP::pad_post_params_count', [false, 'How many fake post variables to insert into the request', 16]),
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OptBool.new('HTTP::uri_fake_end', [false, 'Add a fake end of URI (eg: /%20HTTP/1.0/../../)', false]),
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OptBool.new('HTTP::uri_fake_params_start', [false, 'Add a fake start of params to the URI (eg: /%3fa=b/../)', false]),
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OptBool.new('HTTP::header_folding', [false, 'Enable folding of HTTP headers', false])
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#
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# Remaining evasions to implement
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#
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# OptBool.new('HTTP::chunked', [false, 'Enable chunking of HTTP request via "Transfer-Encoding: chunked"', 'false']),
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# OptInt.new('HTTP::junk_pipeline', [true, 'Insert the specified number of junk pipeline requests', 0]),
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], self.class
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)
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register_autofilter_ports([ 80, 8080, 443, 8000, 8888, 8880, 8008, 3000, 8443 ])
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register_autofilter_services(%W{ http https })
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# Used by digest auth
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@cnonce = make_cnonce
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@nonce_count = -1
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end
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#
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# For HTTP Client exploits, we often want to verify that the server info matches some regex before
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# firing a giant binary exploit blob at it. We override setup() here to accomplish that.
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#
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def setup
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validate_fingerprint
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super
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end
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#
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# This method is meant to be overriden in the exploit module to specify a set of regexps to
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# attempt to match against. A failure to match any of them results in a RuntimeError exception
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# being raised.
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#
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def validate_fingerprint()
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# Don't bother checking if there's no database active.
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if (framework.db.active and
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datastore['FingerprintCheck'] and
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self.class.const_defined?('HttpFingerprint'))
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# Get the module-specific config
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opts = self.class.const_get('HttpFingerprint')
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#
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# XXX: Ideally we could have more structured matches, but doing that requires
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# a more structured response cache.
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#
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info = http_fingerprint(opts)
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if info and opts[:pattern]
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opts[:pattern].each do |re|
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if not re.match(info)
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err = "The target server fingerprint \"#{info}\" does not match \"#{re.to_s}\", use 'set FingerprintCheck false' to disable this check."
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fail_with(Failure::NotFound, err)
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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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#
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# Connects to an HTTP server.
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#
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def connect(opts={})
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dossl = false
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if(opts.has_key?('SSL'))
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dossl = opts['SSL']
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else
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dossl = ssl
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end
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client_username = opts['username'] || datastore['USERNAME'] || ''
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client_password = opts['password'] || datastore['PASSWORD'] || ''
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nclient = Rex::Proto::Http::Client.new(
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opts['rhost'] || rhost,
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(opts['rport'] || rport).to_i,
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{
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'Msf' => framework,
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'MsfExploit' => self,
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},
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dossl,
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ssl_version,
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proxies,
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client_username,
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client_password
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)
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# Configure the HTTP client with the supplied parameter
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nclient.set_config(
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'vhost' => self.vhost(),
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'agent' => datastore['UserAgent'],
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'uri_encode_mode' => datastore['HTTP::uri_encode_mode'],
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'uri_full_url' => datastore['HTTP::uri_full_url'],
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'pad_method_uri_count' => datastore['HTTP::pad_method_uri_count'],
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'pad_uri_version_count' => datastore['HTTP::pad_uri_version_count'],
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'pad_method_uri_type' => datastore['HTTP::pad_method_uri_type'],
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'pad_uri_version_type' => datastore['HTTP::pad_uri_version_type'],
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'method_random_valid' => datastore['HTTP::method_random_valid'],
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'method_random_invalid' => datastore['HTTP::method_random_invalid'],
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'method_random_case' => datastore['HTTP::method_random_case'],
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'uri_dir_self_reference' => datastore['HTTP::uri_dir_self_reference'],
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'uri_dir_fake_relative' => datastore['HTTP::uri_dir_fake_relative'],
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'uri_use_backslashes' => datastore['HTTP::uri_use_backslashes'],
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'pad_fake_headers' => datastore['HTTP::pad_fake_headers'],
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'pad_fake_headers_count' => datastore['HTTP::pad_fake_headers_count'],
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'pad_get_params' => datastore['HTTP::pad_get_params'],
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'pad_get_params_count' => datastore['HTTP::pad_get_params_count'],
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'pad_post_params' => datastore['HTTP::pad_post_params'],
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'pad_post_params_count' => datastore['HTTP::pad_post_params_count'],
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'uri_fake_end' => datastore['HTTP::uri_fake_end'],
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'uri_fake_params_start' => datastore['HTTP::uri_fake_params_start'],
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'header_folding' => datastore['HTTP::header_folding'],
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'usentlm2_session' => datastore['NTLM::UseNTLM2_session'],
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'use_ntlmv2' => datastore['NTLM::UseNTLMv2'],
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'send_lm' => datastore['NTLM::SendLM'],
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'send_ntlm' => datastore['NTLM::SendNTLM'],
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'SendSPN' => datastore['NTLM::SendSPN'],
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'UseLMKey' => datastore['NTLM::UseLMKey'],
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'domain' => datastore['DOMAIN'],
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'DigestAuthIIS' => datastore['DigestAuthIIS']
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)
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# If this connection is global, persist it
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# Required for findsock on these sockets
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if (opts['global'])
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if (self.client)
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disconnect
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end
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self.client = nclient
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end
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return nclient
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end
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#
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# Passes the client connection down to the handler to see if it's of any
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# use.
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#
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def handler(nsock = nil)
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# If no socket was provided, try the global one.
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if ((!nsock) and (self.client))
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nsock = self.client.conn
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end
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# If the parent claims the socket associated with the HTTP client, then
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# we rip the socket out from under the HTTP client.
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if (((rv = super(nsock)) == Handler::Claimed) and
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(self.client) and
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(nsock == self.client.conn))
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self.client.conn = nil
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end
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rv
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end
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#
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# Disconnects the HTTP client
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#
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def disconnect(nclient = self.client)
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if (nclient)
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nclient.close
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end
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if (nclient == self.client)
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self.client = nil
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end
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end
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#
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# Performs cleanup as necessary, disconnecting the HTTP client if it's
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# still established.
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#
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def cleanup
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super
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disconnect
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end
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#
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# Connects to the server, creates a request, sends the request, reads the response
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#
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# Passes +opts+ through directly to Rex::Proto::Http::Client#request_raw.
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#
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def send_request_raw(opts={}, timeout = 20)
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begin
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c = connect(opts)
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r = c.request_raw(opts)
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c.send_recv(r, opts[:timeout] ? opts[:timeout] : timeout)
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rescue ::Errno::EPIPE, ::Timeout::Error
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nil
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end
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end
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#
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# Connects to the server, creates a request, sends the request, reads the response
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#
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# Passes +opts+ through directly to Rex::Proto::Http::Client#request_cgi.
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#
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def send_request_cgi(opts={}, timeout = 20)
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begin
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c = connect(opts)
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r = c.request_cgi(opts)
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c.send_recv(r, opts[:timeout] ? opts[:timeout] : timeout)
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rescue ::Errno::EPIPE, ::Timeout::Error
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nil
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end
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end
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#
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# Combine the user/pass into an auth string for the HTTP Client
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#
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def basic_auth(username, password)
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auth_str = Rex::Text.encode_base64("#{username}:#{password}")
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"Basic #{auth_str}"
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end
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##
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#
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# Wrappers for getters
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#
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##
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#
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# Returns the target URI
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#
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def target_uri
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begin
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# In case TARGETURI is empty, at least we default to '/'
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u = datastore['TARGETURI']
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u = "/" if u.nil? or u.empty?
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URI(u)
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rescue ::URI::InvalidURIError
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print_error "Invalid URI: #{datastore['TARGETURI'].inspect}"
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raise Msf::OptionValidateError.new(['TARGETURI'])
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end
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end
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#
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# Returns a modified version of the URI that:
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# 1. Always has a starting slash
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# 2. Removes all the double slashes
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#
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def normalize_uri(*strs)
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new_str = strs * "/"
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new_str = new_str.gsub!("//", "/") while new_str.index("//")
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# Makes sure there's a starting slash
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unless new_str[0,1] == '/'
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new_str = '/' + new_str
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end
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new_str
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end
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# Returns the Path+Query from a full URI String, nil on error
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def path_from_uri(uri)
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begin
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temp = URI(uri)
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ret_uri = temp.path
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ret_uri << "?#{temp.query}" unless temp.query.nil? or temp.query.empty?
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return ret_uri
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rescue URI::Error
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print_error "Invalid URI: #{uri}"
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return nil
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end
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end
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#
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# Returns the target host
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#
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def rhost
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datastore['RHOST']
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end
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#
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# Returns the remote port
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#
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def rport
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datastore['RPORT']
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end
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#
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# Returns the Host and Port as a string
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#
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def peer
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"#{rhost}:#{rport}"
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end
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#
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# Returns the VHOST of the HTTP server.
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#
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def vhost
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datastore['VHOST'] || datastore['RHOST']
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end
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#
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# Returns the boolean indicating SSL
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#
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def ssl
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((datastore.default?('SSL') and [443,3790].include?(rport.to_i)) or datastore['SSL'])
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end
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#
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# Returns the string indicating SSL version
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#
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def ssl_version
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datastore['SSLVersion']
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end
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#
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# Returns the configured proxy list
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#
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def proxies
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datastore['Proxies']
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end
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#
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# Record various things about an HTTP server that we can glean from the
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# response to a single request. If this method is passed a response, it
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# will use it directly, otherwise it will check the database for a previous
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# fingerprint. Failing that, it will make a request for /.
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#
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# Options:
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# :response an Http::Packet as returned from any of the send_* methods
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#
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# Other options are passed directly to +connect+ if :response is not given
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#
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def http_fingerprint(opts={})
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if (opts[:response])
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res = opts[:response]
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else
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# Check to see if we already have a fingerprint before going out to
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# the network.
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if (framework.db.active)
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::ActiveRecord::Base.connection_pool.with_connection {
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wspace = framework.db.workspace
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if datastore['WORKSPACE']
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wspace = framework.db.find_workspace(datastore['WORKSPACE'])
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end
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s = framework.db.get_service(wspace, rhost, 'tcp', rport)
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if (s and s.info)
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return s.info
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end
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}
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end
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connect(opts)
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uri = opts[:uri] || '/'
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method = opts[:method] || 'GET'
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res = send_request_raw(
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{
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'uri' => uri,
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'method' => method
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})
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end
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# Bail if we don't have anything to fingerprint
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return if not res
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# From here to the end simply does some pre-canned combining and custom matches
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# to build a human-readable string to store in service.info
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extras = []
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if res.headers['Set-Cookie'] =~ /^vmware_soap_session/
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extras << "VMWare Web Services"
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end
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if (res.headers['X-Powered-By'])
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extras << "Powered by " + res.headers['X-Powered-By']
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end
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if (res.headers['Via'])
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extras << "Via-" + res.headers['Via']
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end
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if (res.headers['X-AspNet-Version'])
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extras << "AspNet-Version-" + res.headers['X-AspNet-Version']
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end
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case res.body
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when nil
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# Nothing
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when /openAboutWindow.*\>DD\-WRT ([^\<]+)\<|Authorization.*please note that the default username is \"root\" in/
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extras << "DD-WRT #{$1.to_s.strip}".strip
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when /ID_ESX_Welcome/, /ID_ESX_VIClientDesc/
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extras << "VMware ESX Server"
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when /Test Page for.*Fedora/
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extras << "Fedora Default Page"
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when /Placeholder page/
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extras << "Debian Default Page"
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when /Welcome to Windows Small Business Server (\d+)/
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extras << "Windows SBS #{$1}"
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when /Asterisk@Home/
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extras << "Asterisk"
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when /swfs\/Shell\.html/
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extras << "BPS-1000"
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end
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if datastore['RPORT'].to_i == 3790
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if res.code == 302 and res.headers and res.headers['Location'] =~ /[\x5c\x2f](login|setup)$/n
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if res['Server'] =~ /^(thin.*No Hup)|(nginx[\x5c\x2f][\d\.]+)$/n
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extras << "Metasploit"
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end
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end
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end
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case res.code
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when 301,302
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extras << "#{res.code}-#{res.headers['Location']}"
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when 401
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extras << "#{res.code}-#{res.headers['WWW-Authenticate']}"
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when 403
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extras << "#{res.code}-#{res.headers['WWW-Authenticate']||res.message}"
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when 500 .. 599
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extras << "#{res.code}-#{res.message}"
|
|
end
|
|
|
|
info = "#{res.headers['Server']}"
|
|
info << " ( #{extras.join(", ")} )" if extras.length > 0
|
|
# Report here even if info is empty since the fact that we didn't
|
|
# return early means we at least got a connection and the service is up
|
|
report_web_site(:host => rhost, :port => rport, :ssl => ssl, :vhost => vhost, :info => info.dup)
|
|
info
|
|
end
|
|
|
|
def make_cnonce
|
|
Digest::MD5.hexdigest "%x" % (Time.now.to_i + rand(65535))
|
|
end
|
|
|
|
protected
|
|
|
|
attr_accessor :client
|
|
|
|
end
|
|
|
|
end
|