Class: Rex::Proto::Http::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/proto/http/client.rb

Overview

Acts as a client to an HTTP server, sending requests and receiving responses.

See the RFC: www.w3.org/Protocols/rfc2616/rfc2616.html

Defined Under Namespace

Classes: UnitTest

Constant Summary collapse

DefaultUserAgent = 
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(host, port = 80, context = {}, ssl = nil, ssl_version = nil, proxies = nil) ⇒ Client

Creates a new client instance



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# File 'lib/rex/proto/http/client.rb', line 23

def initialize(host, port = 80, context = {}, ssl = nil, ssl_version = nil, proxies = nil)
	self.hostname = host
	self.port     = port.to_i
	self.context  = context
	self.ssl      = ssl
	self.ssl_version = ssl_version
	self.proxies  = proxies
	self.config = {
		'read_max_data'   => (1024*1024*1),
		'vhost'           => self.hostname,
		'version'         => '1.1',
		'agent'           => DefaultUserAgent,
		#
		# Evasion options
		#
		'uri_encode_mode'        => 'hex-normal', # hex-all, hex-random, u-normal, u-random, u-all
		'uri_encode_count'       => 1,       # integer
		'uri_full_url'           => false,   # bool
		'pad_method_uri_count'   => 1,       # integer
		'pad_uri_version_count'  => 1,       # integer
		'pad_method_uri_type'    => 'space', # space, tab, apache
		'pad_uri_version_type'   => 'space', # space, tab, apache
		'method_random_valid'    => false,   # bool
		'method_random_invalid'  => false,   # bool
		'method_random_case'     => false,   # bool
		'version_random_valid'   => false,   # bool
		'version_random_invalid' => false,   # bool
		'version_random_case'    => false,   # bool
		'uri_dir_self_reference' => false,   # bool
		'uri_dir_fake_relative'  => false,   # bool
		'uri_use_backslashes'    => false,   # bool
		'pad_fake_headers'       => false,   # bool
		'pad_fake_headers_count' => 16,      # integer
		'pad_get_params'         => false,   # bool
		'pad_get_params_count'   => 8,       # integer
		'pad_post_params'        => false,   # bool
		'pad_post_params_count'  => 8,       # integer
		'uri_fake_end'           => false,   # bool
		'uri_fake_params_start'  => false,   # bool
		'header_folding'         => false,   # bool
		'chunked_size'           => 0        # integer
	}

	# This is not used right now...
	self.config_types = {
		'uri_encode_mode'        => ['hex-normal', 'hex-all', 'hex-random', 'u-normal', 'u-random', 'u-all'],
		'uri_encode_count'       => 'integer',
		'uri_full_url'           => 'bool',
		'pad_method_uri_count'   => 'integer',
		'pad_uri_version_count'  => 'integer',
		'pad_method_uri_type'    => ['space', 'tab', 'apache'],
		'pad_uri_version_type'   => ['space', 'tab', 'apache'],
		'method_random_valid'    => 'bool',
		'method_random_invalid'  => 'bool',
		'method_random_case'     => 'bool',
		'version_random_valid'   => 'bool',
		'version_random_invalid' => 'bool',
		'version_random_case'    => 'bool',
		'uri_dir_self_reference' => 'bool',
		'uri_dir_fake_relative'  => 'bool',
		'uri_use_backslashes'    => 'bool',
		'pad_fake_headers'       => 'bool',
		'pad_fake_headers_count' => 'integer',
		'pad_get_params'         => 'bool',
		'pad_get_params_count'   => 'integer',
		'pad_post_params'        => 'bool',
		'pad_post_params_count'  => 'integer',
		'uri_fake_end'           => 'bool',
		'uri_fake_params_start'  => 'bool',
		'header_folding'         => 'bool',
		'chunked_size'           => 'integer'
	}
end

Instance Attribute Details

#config ⇒ Object

The client request configuration



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# File 'lib/rex/proto/http/client.rb', line 776

def config
  @config
end

#config_types ⇒ Object

The client request configuration classes



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# File 'lib/rex/proto/http/client.rb', line 780

def config_types
  @config_types
end

#conn ⇒ Object

The underlying connection.



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# File 'lib/rex/proto/http/client.rb', line 796

def conn
  @conn
end

#context ⇒ Object

The calling context to pass to the socket



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# File 'lib/rex/proto/http/client.rb', line 800

def context
  @context
end

#junk_pipeline ⇒ Object

When parsing the request, thunk off the first response from the server, since junk



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# File 'lib/rex/proto/http/client.rb', line 808

def junk_pipeline
  @junk_pipeline
end

#local_host ⇒ Object

The local host of the client.



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# File 'lib/rex/proto/http/client.rb', line 788

def local_host
  @local_host
end

#local_port ⇒ Object

The local port of the client.



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# File 'lib/rex/proto/http/client.rb', line 792

def local_port
  @local_port
end

#pipeline ⇒ Object

Whether or not pipelining is in use.



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# File 'lib/rex/proto/http/client.rb', line 784

def pipeline
  @pipeline
end

#proxies ⇒ Object

The proxy list



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# File 'lib/rex/proto/http/client.rb', line 804

def proxies
  @proxies
end

Instance Method Details

#close ⇒ Object

Closes the connection to the remote server.



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# File 'lib/rex/proto/http/client.rb', line 316

def close
	if (self.conn)
		self.conn.shutdown
		self.conn.close
	end

	self.conn = nil
end

#conn? ⇒ Boolean

Returns whether or not the conn is valid.

Returns:

  • (Boolean) 


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# File 'lib/rex/proto/http/client.rb', line 441

def conn?
	conn != nil
end

#connect ⇒ Object

Connects to the remote server if possible.



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# File 'lib/rex/proto/http/client.rb', line 291

def connect
	# If we already have a connection and we aren't pipelining, close it.
	if (self.conn)
		if !pipelining?
			close
		else
			return self.conn
		end
	end

	self.conn = Rex::Socket::Tcp.create(
		'PeerHost'  => self.hostname,
		'PeerPort'  => self.port.to_i,
		'LocalHost' => self.local_host,
		'LocalPort' => self.local_port,
		'Context'   => self.context,
		'SSL'       => self.ssl,
		'SSLVersion'=> self.ssl_version,
		'Proxies'   => self.proxies
	)
end

#pipelining? ⇒ Boolean

Whether or not connections should be pipelined.

Returns:

  • (Boolean) 


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# File 'lib/rex/proto/http/client.rb', line 448

def pipelining?
	pipeline
end

#read_response(t = -1)) ⇒ Object

Read a response from the server



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# File 'lib/rex/proto/http/client.rb', line 349

def read_response(t = -1)

	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 || '' )
	
			##########################################################################
			# XXX: NOTE: BUG: get_once currently (as of r10042) rescues "Exception"
			# As such, the following rescue block will ever be reached.  -jjd
			##########################################################################

			# 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.
	if resp.proto == '1.1' and resp.code == 100
		# If so, our real response becaome the body, so we re-parse it.
		body = resp.body
		resp = Response.new
		resp.max_data = config['read_max_data']
		rv = resp.parse(body)
		# XXX: At some point, this may benefit from processing post-completion code
		# as seen above.
	end

	resp
end

#request_cgi(opts = {}) ⇒ Object

Create a CGI compatible request

Options:

  • agent: User-Agent header value

  • basic_auth: Basic-Auth header value

  • connection: Connection header value

  • cookie: Cookie header value

  • ctype: Content-Type header value, default: application/x-www-form-urlencoded

  • data: HTTP data (only useful with some methods, see rfc2616)

  • encode: URI encode the supplied URI

  • headers: HTTP headers as a hash, e.g. { "X-MyHeader" => "value" }

  • method: HTTP method to use in the request, not limited to standard methods defined by rfc2616, default: GET

  • proto: protocol, default: HTTP

  • query: raw query string

  • raw_headers: HTTP headers as a hash

  • uri: the URI to request

  • vars_get: GET variables as a hash to be translated into a query string

  • vars_post: POST variables as a hash to be translated into POST data

  • version: version of the protocol, default: 1.1

  • vhost: Host header value



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# File 'lib/rex/proto/http/client.rb', line 197

def request_cgi(opts={})
	c_enc  = opts['encode']     || false
	c_cgi  = opts['uri']        || '/'
	c_body = opts['data']       || ''
	c_meth = opts['method']     || 'GET'
	c_prot = opts['proto']      || 'HTTP'
	c_vers = opts['version']    || config['version'] || '1.1'
	c_qs   = opts['query']      || ''
	c_varg = opts['vars_get']   || {}
	c_varp = opts['vars_post']  || {}
	c_head = opts['headers']    || config['headers'] || {}
	c_rawh = opts['raw_headers']|| config['raw_headers'] || ''
	c_type = opts['ctype']      || 'application/x-www-form-urlencoded'
	c_ag   = opts['agent']      || config['agent']
	c_cook = opts['cookie']     || config['cookie']
	c_host = opts['vhost']      || config['vhost']
	c_conn = opts['connection']
	c_path = opts['path_info']
	c_auth = opts['basic_auth'] || config['basic_auth'] || ''

	uri    = set_cgi(c_cgi)
	qstr   = c_qs
	pstr   = c_body

	if (config['pad_get_params'])
		1.upto(config['pad_get_params_count'].to_i) do |i|
			qstr << '&' if qstr.length > 0
			qstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
			qstr << '='
			qstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
		end
	end

	c_varg.each_pair do |var,val|
		qstr << '&' if qstr.length > 0
		qstr << set_encode_uri(var)
		qstr << '='
		qstr << set_encode_uri(val)
	end

	if (config['pad_post_params'])
		1.upto(config['pad_post_params_count'].to_i) do |i|
			pstr << '&' if qstr.length > 0
			pstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
			pstr << '='
			pstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
		end
	end

	c_varp.each_pair do |var,val|
		pstr << '&' if pstr.length > 0
		pstr << set_encode_uri(var)
		pstr << '='
		pstr << set_encode_uri(val)
	end

	req = ''
	req << set_method(c_meth)
	req << set_method_uri_spacer()
	req << set_uri_prepend()
	req << (c_enc ? set_encode_uri(uri):uri)

	if (qstr.length > 0)
		req << '?'
		req << qstr
	end

	req << set_path_info(c_path)
	req << set_uri_append()
	req << set_uri_version_spacer()
	req << set_version(c_prot, c_vers)
	req << set_host_header(c_host)
	req << set_agent_header(c_ag)

	if (c_auth.length > 0)
		req << set_basic_auth_header(c_auth)
	end

	req << set_cookie_header(c_cook)
	req << set_connection_header(c_conn)
	req << set_extra_headers(c_head)

	req << set_content_type_header(c_type)
	req << set_content_len_header(pstr.length)
	req << set_chunked_header()
	req << set_raw_headers(c_rawh)
	req << set_body(pstr)

	req
end

#request_raw(opts = {}) ⇒ Object

Create an arbitrary HTTP request



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# File 'lib/rex/proto/http/client.rb', line 126

def request_raw(opts={})
	c_enc  = opts['encode']     || false
	c_uri  = opts['uri']        || '/'
	c_body = opts['data']       || ''
	c_meth = opts['method']     || 'GET'
	c_prot = opts['proto']      || 'HTTP'
	c_vers = opts['version']    || config['version'] || '1.1'
	c_qs   = opts['query']
	c_ag   = opts['agent']      || config['agent']
	c_cook = opts['cookie']     || config['cookie']
	c_host = opts['vhost']      || config['vhost'] || self.hostname
	c_head = opts['headers']    || config['headers'] || {}
	c_rawh = opts['raw_headers']|| config['raw_headers'] || ''
	c_conn = opts['connection']
	c_auth = opts['basic_auth'] || config['basic_auth'] || ''

	uri    = set_uri(c_uri)

	req = ''
	req << set_method(c_meth)
	req << set_method_uri_spacer()
	req << set_uri_prepend()
	req << (c_enc ? set_encode_uri(uri) : uri)

	if (c_qs)
		req << '?'
		req << (c_enc ? set_encode_qs(c_qs) : c_qs)
	end

	req << set_uri_append()
	req << set_uri_version_spacer()
	req << set_version(c_prot, c_vers)
	req << set_host_header(c_host)
	req << set_agent_header(c_ag)

	if (c_auth.length > 0)
		req << set_basic_auth_header(c_auth)
	end

	req << set_cookie_header(c_cook)
	req << set_connection_header(c_conn)
	req << set_extra_headers(c_head)
	req << set_raw_headers(c_rawh)
	req << set_body(c_body)

	req
end

#send_recv(req, t = -1,, persist = false) ⇒ Object

Transmit an HTTP request and receive the response If persist is set, then the request will attempt to reuse an existing connection.



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# File 'lib/rex/proto/http/client.rb', line 330

def send_recv(req, t = -1, persist=false)
	@pipeline = persist
	send_request(req)
	res = read_response(t)
	res.request = req.to_s if res
	res
end

#send_request(req) ⇒ Object

Send an HTTP request to the server



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# File 'lib/rex/proto/http/client.rb', line 341

def send_request(req)
	connect
	conn.put(req.to_s)
end

#set_agent_header(agent) ⇒ Object

Return the HTTP agent header



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# File 'lib/rex/proto/http/client.rb', line 687

def set_agent_header(agent)
	agent ? set_formatted_header("User-Agent", agent) : ""
end

#set_basic_auth_header(auth) ⇒ Object

Return the Authorization basic-auth header



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# File 'lib/rex/proto/http/client.rb', line 722

def set_basic_auth_header(auth)
	auth ? set_formatted_header("Authorization", "Basic " + Rex::Text.encode_base64(auth)) : ""
end

#set_body(data) ⇒ Object

Return the HTTP seperator and body string



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# File 'lib/rex/proto/http/client.rb', line 586

def set_body(data)
	return "\r\n" + data if self.config['chunked_size'] == 0
	str = data.dup
	chunked = ''
	while str.size > 0
		chunk = str.slice!(0,rand(self.config['chunked_size']) + 1)
		chunked << sprintf("%x", chunk.size) + "\r\n" + chunk + "\r\n"
	end
	"\r\n" + chunked + "0\r\n\r\n"
end

#set_cgi(uri) ⇒ Object

Return the cgi



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# File 'lib/rex/proto/http/client.rb', line 510

def set_cgi(uri)

	if (self.config['uri_dir_self_reference'])
		uri.gsub!('/', '/./')
	end

	if (self.config['uri_dir_fake_relative'])
		buf = ""
		uri.split('/').each do |part|
			cnt = rand(8)+2
			1.upto(cnt) { |idx|
				buf << "/" + Rex::Text.rand_text_alphanumeric(rand(32)+1)
			}
			buf << ("/.." * cnt)
			buf << "/" + part
		end
		uri = buf
	end

	url = uri

	if (self.config['uri_full_url'])
		url = self.ssl ? "https" : "http"
		url << self.config['vhost']
		url << (self.port == 80) ? "" : ":#{self.port}"
		url << uri
	end

	url
end

#set_chunked_header ⇒ Object 



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# File 'lib/rex/proto/http/client.rb', line 748

def set_chunked_header()
	return "" if self.config['chunked_size'] == 0
	set_formatted_header('Transfer-Encoding', 'chunked')
end

#set_config(opts = {}) ⇒ Object

Set configuration options



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# File 'lib/rex/proto/http/client.rb', line 100

def set_config(opts = {})
	opts.each_pair do |var,val|
		typ = self.config_types[var] || 'string'

		if(typ.class.to_s == 'Array')
			if not typ.include?(val)
				raise RuntimeError, "The specified value for #{var} is not one of the valid choices"
			end
		end

		if(typ == 'bool')
			val = (val =~ /^(t|y|1)$/i ? true : false)
		end

		if(typ == 'integer')
			val = val.to_i
		end

		self.config[var]=val
	end

end

#set_connection_header(conn) ⇒ Object

Return the HTTP connection header



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# File 'lib/rex/proto/http/client.rb', line 701

def set_connection_header(conn)
	conn ? set_formatted_header("Connection", conn) : ""
end

#set_content_len_header(clen) ⇒ Object

Return the content length header



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# File 'lib/rex/proto/http/client.rb', line 714

def set_content_len_header(clen)
	return "" if self.config['chunked_size'] > 0
	set_formatted_header("Content-Length", clen)
end

#set_content_type_header(ctype) ⇒ Object

Return the content type header



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# File 'lib/rex/proto/http/client.rb', line 708

def set_content_type_header(ctype)
	set_formatted_header("Content-Type", ctype)
end

#set_cookie_header(cookie) ⇒ Object

Return the HTTP cookie header



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# File 'lib/rex/proto/http/client.rb', line 694

def set_cookie_header(cookie)
	cookie ? set_formatted_header("Cookie", cookie) : ""
end

#set_encode_qs(qs) ⇒ Object

Return the encoded query string



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# File 'lib/rex/proto/http/client.rb', line 466

def set_encode_qs(qs)
	a = qs
	self.config['uri_encode_count'].times {
		a = Rex::Text.uri_encode(a, self.config['uri_encode_mode'])
	}
	return a
end

#set_encode_uri(uri) ⇒ Object

Return the encoded URI

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# File 'lib/rex/proto/http/client.rb', line 455

def set_encode_uri(uri)
	a = uri
	self.config['uri_encode_count'].times {
		a = Rex::Text.uri_encode(a, self.config['uri_encode_mode'])
	}
	return a
end

#set_extra_headers(headers) ⇒ Object

Return a string of formatted extra headers



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# File 'lib/rex/proto/http/client.rb', line 729

def set_extra_headers(headers)
	buf = ''

	if (self.config['pad_fake_headers'])
		1.upto(self.config['pad_fake_headers_count'].to_i) do |i|
			buf << set_formatted_header(
				Rex::Text.rand_text_alphanumeric(rand(32)+1),
				Rex::Text.rand_text_alphanumeric(rand(32)+1)
			)
		end
	end

	headers.each_pair do |var,val|
		buf << set_formatted_header(var, val)
	end

	buf
end

#set_formatted_header(var, val) ⇒ Object

Return a formatted header string



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# File 'lib/rex/proto/http/client.rb', line 763

def set_formatted_header(var, val)
	if (self.config['header_folding'])
		"#{var}:\r\n\t#{val}\r\n"
	else
		"#{var}: #{val}\r\n"
	end
end

#set_host_header(host) ⇒ Object

Return the HTTP Host header



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# File 'lib/rex/proto/http/client.rb', line 678

def set_host_header(host)
	return "" if self.config['uri_full_url']
	host ||= self.config['vhost']
	set_formatted_header("Host", host)
end

#set_method(method) ⇒ Object

Return the HTTP method string



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# File 'lib/rex/proto/http/client.rb', line 544

def set_method(method)
	ret = method

	if (self.config['method_random_valid'])
		ret = ['GET', 'POST', 'HEAD'][rand(3)]
	end

	if (self.config['method_random_invalid'])
		ret = Rex::Text.rand_text_alpha(rand(20)+1)
	end

	if (self.config['method_random_case'])
		ret = Rex::Text.to_rand_case(ret)
	end

	ret
end

#set_method_uri_spacer ⇒ Object

Return the spacing between the method and uri



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# File 'lib/rex/proto/http/client.rb', line 608

def set_method_uri_spacer
	len = self.config['pad_method_uri_count'].to_i
	set = " "
	buf = ""

	case self.config['pad_method_uri_type']
	when 'tab'
		set = "\t"
	when 'apache'
		set = "\t \x0b\x0c\x0d"
	end

	while(buf.length < len)
		buf << set[ rand(set.length) ]
	end

	return buf
end

#set_path_info(path) ⇒ Object

Return the HTTP path info TODO:

* Encode path information



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# File 'lib/rex/proto/http/client.rb', line 601

def set_path_info(path)
	path ? path : ''
end

#set_raw_headers(data) ⇒ Object

Return a string of raw header data



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# File 'lib/rex/proto/http/client.rb', line 756

def set_raw_headers(data)
	data
end

#set_uri(uri) ⇒ Object

Return the uri



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# File 'lib/rex/proto/http/client.rb', line 477

def set_uri(uri)

	if (self.config['uri_dir_self_reference'])
		uri.gsub!('/', '/./')
	end

	if (self.config['uri_dir_fake_relative'])
		buf = ""
		uri.split('/').each do |part|
			cnt = rand(8)+2
			1.upto(cnt) { |idx|
				buf << "/" + Rex::Text.rand_text_alphanumeric(rand(32)+1)
			}
			buf << ("/.." * cnt)
			buf << "/" + part
		end
		uri = buf
	end

	if (self.config['uri_full_url'])
		url = self.ssl ? "https" : "http"
		url << self.config['vhost']
		url << ((self.port == 80) ? "" : ":#{self.port}")
		url << uri
		url
	else
		uri
	end
end

#set_uri_append ⇒ Object

Return the padding to place before the uri



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# File 'lib/rex/proto/http/client.rb', line 669

def set_uri_append
	# TODO:
	#  * Support different padding types
	""
end

#set_uri_prepend ⇒ Object

Return the padding to place before the uri



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# File 'lib/rex/proto/http/client.rb', line 652

def set_uri_prepend
	prefix = ""

	if (self.config['uri_fake_params_start'])
		prefix << '/%3fa=b/../'
	end

	if (self.config['uri_fake_end'])
		prefix << '/%20HTTP/1.0/../../'
	end

	prefix
end

#set_uri_version_spacer ⇒ Object

Return the spacing between the uri and the version



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# File 'lib/rex/proto/http/client.rb', line 630

def set_uri_version_spacer
	len = self.config['pad_uri_version_count'].to_i
	set = " "
	buf = ""

	case self.config['pad_uri_version_type']
	when 'tab'
		set = "\t"
	when 'apache'
		set = "\t \x0b\x0c\x0d"
	end

	while(buf.length < len)
		buf << set[ rand(set.length) ]
	end

	return buf
end

#set_version(protocol, version) ⇒ Object

Return the HTTP version string



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# File 'lib/rex/proto/http/client.rb', line 565

def set_version(protocol, version)
	ret = protocol + "/" + version

	if (self.config['version_random_valid'])
		ret = protocol + "/" +  ['1.0', '1.1'][rand(2)]
	end

	if (self.config['version_random_invalid'])
		ret = Rex::Text.rand_text_alphanumeric(rand(20)+1)
	end

	if (self.config['version_random_case'])
		ret = Rex::Text.to_rand_case(ret)
	end

	ret << "\r\n"
end

#stop ⇒ Object

Cleans up any outstanding connections and other resources.



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# File 'lib/rex/proto/http/client.rb', line 434

def stop
	close
end