722 lines
21 KiB
Ruby
722 lines
21 KiB
Ruby
# -*- coding: binary -*-
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require 'rex/socket'
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require 'rex/proto/http'
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require 'rex/text'
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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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require 'rex/proto/http/client_request'
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module Rex
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module Proto
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module Http
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###
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#
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# Acts as a client to an HTTP server, sending requests and receiving responses.
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#
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# See the RFC: http://www.w3.org/Protocols/rfc2616/rfc2616.html
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#
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###
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class Client
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DefaultUserAgent = ClientRequest::DefaultUserAgent
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#
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# Creates a new client instance
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#
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def initialize(host, port = 80, context = {}, ssl = nil, ssl_version = nil, proxies = nil, username = '', password = '')
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self.hostname = host
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self.port = port.to_i
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self.context = context
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self.ssl = ssl
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self.ssl_version = ssl_version
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self.proxies = proxies
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self.username = username
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self.password = password
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# Take ClientRequest's defaults, but override with our own
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self.config = Http::ClientRequest::DefaultConfig.merge({
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'read_max_data' => (1024*1024*1),
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'vhost' => self.hostname,
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})
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# XXX: This info should all be controlled by ClientRequest
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self.config_types = {
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'uri_encode_mode' => ['hex-normal', 'hex-all', 'hex-random', 'u-normal', 'u-random', 'u-all'],
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'uri_encode_count' => 'integer',
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'uri_full_url' => 'bool',
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'pad_method_uri_count' => 'integer',
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'pad_uri_version_count' => 'integer',
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'pad_method_uri_type' => ['space', 'tab', 'apache'],
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'pad_uri_version_type' => ['space', 'tab', 'apache'],
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'method_random_valid' => 'bool',
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'method_random_invalid' => 'bool',
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'method_random_case' => 'bool',
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'version_random_valid' => 'bool',
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'version_random_invalid' => 'bool',
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'version_random_case' => 'bool',
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'uri_dir_self_reference' => 'bool',
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'uri_dir_fake_relative' => 'bool',
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'uri_use_backslashes' => 'bool',
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'pad_fake_headers' => 'bool',
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'pad_fake_headers_count' => 'integer',
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'pad_get_params' => 'bool',
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'pad_get_params_count' => 'integer',
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'pad_post_params' => 'bool',
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'pad_post_params_count' => 'integer',
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'uri_fake_end' => 'bool',
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'uri_fake_params_start' => 'bool',
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'header_folding' => 'bool',
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'chunked_size' => 'integer'
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}
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end
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#
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# Set configuration options
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#
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def set_config(opts = {})
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opts.each_pair do |var,val|
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# Default type is string
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typ = self.config_types[var] || 'string'
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# These are enum types
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if typ.is_a?(Array)
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if not typ.include?(val)
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raise RuntimeError, "The specified value for #{var} is not one of the valid choices"
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end
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end
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# The caller should have converted these to proper ruby types, but
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# take care of the case where they didn't before setting the
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# config.
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if(typ == 'bool')
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val = (val =~ /^(t|y|1)$/i ? true : false || val === true)
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end
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if(typ == 'integer')
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val = val.to_i
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end
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self.config[var]=val
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end
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end
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#
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# Create an arbitrary HTTP request
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#
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# @param opts [Hash]
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# @option opts 'agent' [String] User-Agent header value
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# @option opts 'connection' [String] Connection header value
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# @option opts 'cookie' [String] Cookie header value
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# @option opts 'data' [String] HTTP data (only useful with some methods, see rfc2616)
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# @option opts 'encode' [Bool] URI encode the supplied URI, default: false
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# @option opts 'headers' [Hash] HTTP headers, e.g. <code>{ "X-MyHeader" => "value" }</code>
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# @option opts 'method' [String] HTTP method to use in the request, not limited to standard methods defined by rfc2616, default: GET
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# @option opts 'proto' [String] protocol, default: HTTP
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# @option opts 'query' [String] raw query string
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# @option opts 'raw_headers' [Hash] HTTP headers
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# @option opts 'uri' [String] the URI to request
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# @option opts 'version' [String] version of the protocol, default: 1.1
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# @option opts 'vhost' [String] Host header value
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#
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# @return [ClientRequest]
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def request_raw(opts={})
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opts = self.config.merge(opts)
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opts['ssl'] = self.ssl
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opts['cgi'] = false
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opts['port'] = self.port
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req = ClientRequest.new(opts)
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end
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#
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# Create a CGI compatible request
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#
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# @param (see #request_raw)
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# @option opts (see #request_raw)
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# @option opts 'ctype' [String] Content-Type header value, default: +application/x-www-form-urlencoded+
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# @option opts 'encode_params' [Bool] URI encode the GET or POST variables (names and values), default: true
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# @option opts 'vars_get' [Hash] GET variables as a hash to be translated into a query string
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# @option opts 'vars_post' [Hash] POST variables as a hash to be translated into POST data
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#
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# @return [ClientRequest]
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def request_cgi(opts={})
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opts = self.config.merge(opts)
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opts['ctype'] ||= 'application/x-www-form-urlencoded'
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opts['ssl'] = self.ssl
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opts['cgi'] = true
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opts['port'] = self.port
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req = ClientRequest.new(opts)
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req
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end
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#
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# Connects to the remote server if possible.
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#
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# @param t [Fixnum] Timeout
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# @see Rex::Socket::Tcp.create
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# @return [Rex::Socket::Tcp]
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def connect(t = -1)
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# If we already have a connection and we aren't pipelining, close it.
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if (self.conn)
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if !pipelining?
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close
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else
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return self.conn
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end
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end
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timeout = (t.nil? or t == -1) ? 0 : t
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self.conn = Rex::Socket::Tcp.create(
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'PeerHost' => self.hostname,
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'PeerPort' => self.port.to_i,
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'LocalHost' => self.local_host,
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'LocalPort' => self.local_port,
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'Context' => self.context,
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'SSL' => self.ssl,
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'SSLVersion' => self.ssl_version,
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'Proxies' => self.proxies,
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'Timeout' => timeout
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)
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end
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#
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# Closes the connection to the remote server.
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#
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def close
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if (self.conn)
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self.conn.shutdown
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self.conn.close unless self.conn.closed?
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end
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self.conn = nil
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end
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#
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# Sends a request and gets a response back
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#
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# If the request is a 401, and we have creds, it will attempt to complete
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# authentication and return the final response
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#
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# @return (see #_send_recv)
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def send_recv(req, t = -1, persist=false)
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res = _send_recv(req,t,persist)
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if res and res.code == 401 and res.headers['WWW-Authenticate']
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res = send_auth(res, req.opts, t, persist)
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end
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res
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end
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#
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# Transmit an HTTP request and receive the response
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#
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# If persist is set, then the request will attempt to reuse an existing
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# connection.
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#
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# Call this directly instead of {#send_recv} if you don't want automatic
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# authentication handling.
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#
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# @return (see #read_response)
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def _send_recv(req, t = -1, persist=false)
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@pipeline = persist
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send_request(req, t)
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res = read_response(t)
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res.request = req.to_s if res
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res
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end
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#
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# Send an HTTP request to the server
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#
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# @param req [Request,ClientRequest,#to_s] The request to send
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# @param t (see #connect)
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#
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# @return [void]
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def send_request(req, t = -1)
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connect(t)
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conn.put(req.to_s)
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end
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# Resends an HTTP Request with the propper authentcation headers
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# set. If we do not support the authentication type the server requires
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# we return the original response object
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#
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# @param res [Response] the HTTP Response object
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# @param opts [Hash] the options used to generate the original HTTP request
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# @param t [Fixnum] the timeout for the request in seconds
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# @param persist [Boolean] whether or not to persist the TCP connection (pipelining)
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#
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# @return [Response] the last valid HTTP response object we received
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def send_auth(res, opts, t, persist)
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if opts['username'].nil? or opts['username'] == ''
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if self.username and not (self.username == '')
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opts['username'] = self.username
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opts['password'] = self.password
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else
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opts['username'] = nil
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opts['password'] = nil
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end
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end
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return res if opts['username'].nil? or opts['username'] == ''
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supported_auths = res.headers['WWW-Authenticate']
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if supported_auths.include? 'Basic'
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opts['headers'] ||= {}
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opts['headers']['Authorization'] = basic_auth_header(opts['username'],opts['password'] )
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req = request_cgi(opts)
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res = _send_recv(req,t,persist)
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return res
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elsif supported_auths.include? "Digest"
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temp_response = digest_auth(opts)
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if temp_response.kind_of? Rex::Proto::Http::Response
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res = temp_response
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end
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return res
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elsif supported_auths.include? "NTLM"
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opts['provider'] = 'NTLM'
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temp_response = negotiate_auth(opts)
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if temp_response.kind_of? Rex::Proto::Http::Response
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res = temp_response
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end
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return res
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elsif supported_auths.include? "Negotiate"
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opts['provider'] = 'Negotiate'
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temp_response = negotiate_auth(opts)
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if temp_response.kind_of? Rex::Proto::Http::Response
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res = temp_response
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end
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return res
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end
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return res
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end
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# Converts username and password into the HTTP Basic authorization
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# string.
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#
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# @return [String] A value suitable for use as an Authorization header
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def basic_auth_header(username,password)
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auth_str = username.to_s + ":" + password.to_s
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auth_str = "Basic " + Rex::Text.encode_base64(auth_str)
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end
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# Send a series of requests to complete Digest Authentication
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#
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# @param opts [Hash] the options used to build an HTTP request
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#
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# @return [Response] the last valid HTTP response we received
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def digest_auth(opts={})
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@nonce_count = 0
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to = opts['timeout'] || 20
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digest_user = opts['username'] || ""
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digest_password = opts['password'] || ""
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method = opts['method']
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path = opts['uri']
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iis = true
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if (opts['DigestAuthIIS'] == false or self.config['DigestAuthIIS'] == false)
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iis = false
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end
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begin
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@nonce_count += 1
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resp = opts['response']
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if not resp
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# Get authentication-challenge from server, and read out parameters required
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r = request_cgi(opts.merge({
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'uri' => path,
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'method' => method }))
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resp = _send_recv(r, to)
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unless resp.kind_of? Rex::Proto::Http::Response
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return nil
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end
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if resp.code != 401
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return resp
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end
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return resp unless resp.headers['WWW-Authenticate']
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end
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# Don't anchor this regex to the beginning of string because header
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# folding makes it appear later when the server presents multiple
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# WWW-Authentication options (such as is the case with IIS configured
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# for Digest or NTLM).
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resp['www-authenticate'] =~ /Digest (.*)/
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parameters = {}
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$1.split(/,[[:space:]]*/).each do |p|
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k, v = p.split("=", 2)
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parameters[k] = v.gsub('"', '')
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end
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qop = parameters['qop']
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if parameters['algorithm'] =~ /(.*?)(-sess)?$/
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algorithm = case $1
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when 'MD5' then Digest::MD5
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when 'SHA1' then Digest::SHA1
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when 'SHA2' then Digest::SHA2
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when 'SHA256' then Digest::SHA256
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when 'SHA384' then Digest::SHA384
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when 'SHA512' then Digest::SHA512
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when 'RMD160' then Digest::RMD160
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else raise Error, "unknown algorithm \"#{$1}\""
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end
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algstr = parameters["algorithm"]
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sess = $2
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else
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algorithm = Digest::MD5
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algstr = "MD5"
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sess = false
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end
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a1 = if sess then
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[
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algorithm.hexdigest("#{digest_user}:#{parameters['realm']}:#{digest_password}"),
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parameters['nonce'],
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@cnonce
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].join ':'
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else
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"#{digest_user}:#{parameters['realm']}:#{digest_password}"
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end
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ha1 = algorithm.hexdigest(a1)
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ha2 = algorithm.hexdigest("#{method}:#{path}")
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request_digest = [ha1, parameters['nonce']]
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request_digest.push(('%08x' % @nonce_count), @cnonce, qop) if qop
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request_digest << ha2
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request_digest = request_digest.join ':'
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# Same order as IE7
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auth = [
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"Digest username=\"#{digest_user}\"",
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"realm=\"#{parameters['realm']}\"",
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"nonce=\"#{parameters['nonce']}\"",
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"uri=\"#{path}\"",
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"cnonce=\"#{@cnonce}\"",
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"nc=#{'%08x' % @nonce_count}",
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"algorithm=#{algstr}",
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"response=\"#{algorithm.hexdigest(request_digest)[0, 32]}\"",
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# The spec says the qop value shouldn't be enclosed in quotes, but
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# some versions of IIS require it and Apache accepts it. Chrome
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# and Firefox both send it without quotes but IE does it this way.
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# Use the non-compliant-but-everybody-does-it to be as compatible
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# as possible by default. The user can override if they don't like
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# it.
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if qop.nil? then
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elsif iis then
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"qop=\"#{qop}\""
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else
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"qop=#{qop}"
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end,
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if parameters.key? 'opaque' then
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"opaque=\"#{parameters['opaque']}\""
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end
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].compact
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headers ={ 'Authorization' => auth.join(', ') }
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headers.merge!(opts['headers']) if opts['headers']
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# Send main request with authentication
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r = request_cgi(opts.merge({
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'uri' => path,
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'method' => method,
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'headers' => headers }))
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resp = _send_recv(r, to, true)
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unless resp.kind_of? Rex::Proto::Http::Response
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return nil
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end
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return resp
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rescue ::Errno::EPIPE, ::Timeout::Error
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end
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end
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#
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# Builds a series of requests to complete Negotiate Auth. Works essentially
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# the same way as Digest auth. Same pipelining concerns exist.
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#
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# @option opts (see #send_request_cgi)
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# @option opts provider ["Negotiate","NTLM"] What Negotiate provider to use
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#
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# @return [Response] the last valid HTTP response we received
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def negotiate_auth(opts={})
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ntlm_options = {
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:signing => false,
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:usentlm2_session => self.config['usentlm2_session'],
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:use_ntlmv2 => self.config['use_ntlmv2'],
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:send_lm => self.config['send_lm'],
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:send_ntlm => self.config['send_ntlm']
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}
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to = opts['timeout'] || 20
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opts['username'] ||= ''
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opts['password'] ||= ''
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if opts['provider'] and opts['provider'].include? 'Negotiate'
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provider = "Negotiate "
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else
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provider = 'NTLM '
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end
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opts['method']||= 'GET'
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opts['headers']||= {}
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ntlmssp_flags = ::Rex::Proto::NTLM::Utils.make_ntlm_flags(ntlm_options)
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workstation_name = Rex::Text.rand_text_alpha(rand(8)+6)
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domain_name = self.config['domain']
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b64_blob = Rex::Text::encode_base64(
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::Rex::Proto::NTLM::Utils::make_ntlmssp_blob_init(
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domain_name,
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workstation_name,
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ntlmssp_flags
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))
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ntlm_message_1 = provider + b64_blob
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begin
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# First request to get the challenge
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opts['headers']['Authorization'] = ntlm_message_1
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r = request_cgi(opts)
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resp = _send_recv(r, to)
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unless resp.kind_of? Rex::Proto::Http::Response
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return nil
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end
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return resp unless resp.code == 401 && resp.headers['WWW-Authenticate']
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# Get the challenge and craft the response
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ntlm_challenge = resp.headers['WWW-Authenticate'].scan(/#{provider}([A-Z0-9\x2b\x2f=]+)/ni).flatten[0]
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return resp unless ntlm_challenge
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ntlm_message_2 = Rex::Text::decode_base64(ntlm_challenge)
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blob_data = ::Rex::Proto::NTLM::Utils.parse_ntlm_type_2_blob(ntlm_message_2)
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challenge_key = blob_data[:challenge_key]
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server_ntlmssp_flags = blob_data[:server_ntlmssp_flags] #else should raise an error
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default_name = blob_data[:default_name] || '' #netbios name
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default_domain = blob_data[:default_domain] || '' #netbios domain
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dns_host_name = blob_data[:dns_host_name] || '' #dns name
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dns_domain_name = blob_data[:dns_domain_name] || '' #dns domain
|
|
chall_MsvAvTimestamp = blob_data[:chall_MsvAvTimestamp] || '' #Client time
|
|
|
|
spnopt = {:use_spn => self.config['SendSPN'], :name => self.hostname}
|
|
|
|
resp_lm, resp_ntlm, client_challenge, ntlm_cli_challenge = ::Rex::Proto::NTLM::Utils.create_lm_ntlm_responses(
|
|
opts['username'],
|
|
opts['password'],
|
|
challenge_key,
|
|
domain_name,
|
|
default_name,
|
|
default_domain,
|
|
dns_host_name,
|
|
dns_domain_name,
|
|
chall_MsvAvTimestamp,
|
|
spnopt,
|
|
ntlm_options
|
|
)
|
|
|
|
ntlm_message_3 = ::Rex::Proto::NTLM::Utils.make_ntlmssp_blob_auth(
|
|
domain_name,
|
|
workstation_name,
|
|
opts['username'],
|
|
resp_lm,
|
|
resp_ntlm,
|
|
'',
|
|
ntlmssp_flags
|
|
)
|
|
|
|
ntlm_message_3 = Rex::Text::encode_base64(ntlm_message_3)
|
|
|
|
# Send the response
|
|
opts['headers']['Authorization'] = "#{provider}#{ntlm_message_3}"
|
|
r = request_cgi(opts)
|
|
resp = _send_recv(r, to, true)
|
|
unless resp.kind_of? Rex::Proto::Http::Response
|
|
return nil
|
|
end
|
|
return resp
|
|
|
|
rescue ::Errno::EPIPE, ::Timeout::Error
|
|
return nil
|
|
end
|
|
end
|
|
#
|
|
# Read a response from the server
|
|
#
|
|
# @return [Response]
|
|
def read_response(t = -1, opts = {})
|
|
|
|
resp = Response.new
|
|
resp.max_data = config['read_max_data']
|
|
|
|
# Wait at most t seconds for the full response to be read in. We only
|
|
# do this if t was specified as a negative value indicating an infinite
|
|
# wait cycle. If t were specified as nil it would indicate that no
|
|
# response parsing is required.
|
|
|
|
return resp if not t
|
|
|
|
Timeout.timeout((t < 0) ? nil : t) do
|
|
|
|
rv = nil
|
|
while (
|
|
rv != Packet::ParseCode::Completed and
|
|
rv != Packet::ParseCode::Error
|
|
)
|
|
|
|
begin
|
|
|
|
buff = conn.get_once(-1, 1)
|
|
rv = resp.parse( buff || '' )
|
|
|
|
# Handle unexpected disconnects
|
|
rescue ::Errno::EPIPE, ::EOFError, ::IOError
|
|
case resp.state
|
|
when Packet::ParseState::ProcessingHeader
|
|
resp = nil
|
|
when Packet::ParseState::ProcessingBody
|
|
# truncated request, good enough
|
|
resp.error = :truncated
|
|
end
|
|
break
|
|
end
|
|
|
|
# This is a dirty hack for broken HTTP servers
|
|
if rv == Packet::ParseCode::Completed
|
|
rbody = resp.body
|
|
rbufq = resp.bufq
|
|
|
|
rblob = rbody.to_s + rbufq.to_s
|
|
tries = 0
|
|
begin
|
|
# XXX: This doesn't deal with chunked encoding or "Content-type: text/html; charset=..."
|
|
while tries < 1000 and resp.headers["Content-Type"]== "text/html" and rblob !~ /<\/html>/i
|
|
buff = conn.get_once(-1, 0.05)
|
|
break if not buff
|
|
rblob += buff
|
|
tries += 1
|
|
end
|
|
rescue ::Errno::EPIPE, ::EOFError, ::IOError
|
|
end
|
|
|
|
resp.bufq = ""
|
|
resp.body = rblob
|
|
end
|
|
end
|
|
end
|
|
|
|
return resp if not resp
|
|
|
|
# As a last minute hack, we check to see if we're dealing with a 100 Continue here.
|
|
# Most of the time this is handled by the parser via check_100()
|
|
if resp.proto == '1.1' and resp.code == 100 and not opts[:skip_100]
|
|
# Read the real response from the body if we found one
|
|
# If so, our real response became the body, so we re-parse it.
|
|
if resp.body.to_s =~ /^HTTP/
|
|
body = resp.body
|
|
resp = Response.new
|
|
resp.max_data = config['read_max_data']
|
|
rv = resp.parse(body)
|
|
# We found a 100 Continue but didn't read the real reply yet
|
|
# Otherwise reread the reply, but don't try this hack again
|
|
else
|
|
resp = read_response(t, :skip_100 => true)
|
|
end
|
|
end
|
|
|
|
resp
|
|
end
|
|
|
|
#
|
|
# Cleans up any outstanding connections and other resources.
|
|
#
|
|
def stop
|
|
close
|
|
end
|
|
|
|
#
|
|
# Returns whether or not the conn is valid.
|
|
#
|
|
def conn?
|
|
conn != nil
|
|
end
|
|
|
|
#
|
|
# Whether or not connections should be pipelined.
|
|
#
|
|
def pipelining?
|
|
pipeline
|
|
end
|
|
|
|
#
|
|
# The client request configuration
|
|
#
|
|
attr_accessor :config
|
|
#
|
|
# The client request configuration classes
|
|
#
|
|
attr_accessor :config_types
|
|
#
|
|
# Whether or not pipelining is in use.
|
|
#
|
|
attr_accessor :pipeline
|
|
#
|
|
# The local host of the client.
|
|
#
|
|
attr_accessor :local_host
|
|
#
|
|
# The local port of the client.
|
|
#
|
|
attr_accessor :local_port
|
|
#
|
|
# The underlying connection.
|
|
#
|
|
attr_accessor :conn
|
|
#
|
|
# The calling context to pass to the socket
|
|
#
|
|
attr_accessor :context
|
|
#
|
|
# The proxy list
|
|
#
|
|
attr_accessor :proxies
|
|
|
|
# Auth
|
|
attr_accessor :username, :password
|
|
|
|
# When parsing the request, thunk off the first response from the server, since junk
|
|
attr_accessor :junk_pipeline
|
|
|
|
protected
|
|
|
|
# https
|
|
attr_accessor :ssl, :ssl_version # :nodoc:
|
|
|
|
attr_accessor :hostname, :port # :nodoc:
|
|
|
|
|
|
end
|
|
|
|
end
|
|
end
|
|
end
|