828 lines
18 KiB
Ruby
828 lines
18 KiB
Ruby
require 'rex/socket'
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require 'rex/proto/http'
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require 'rex/text'
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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
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# responses.
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#
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###
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class Client
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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)
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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.config = {
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'read_max_data' => (1024*1024*1),
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'vhost' => self.hostname,
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'version' => '1.1',
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'agent' => "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)",
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#
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# Evasion options
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#
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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' => 1, # integer
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'uri_full_url' => false, # bool
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'pad_method_uri_count' => 1, # integer
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'pad_uri_version_count' => 1, # integer
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'pad_method_uri_type' => 'space', # space, tab, apache
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'pad_uri_version_type' => 'space', # space, tab, apache
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'method_random_valid' => false, # bool
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'method_random_invalid' => false, # bool
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'method_random_case' => false, # bool
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'version_random_valid' => false, # bool
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'version_random_invalid' => false, # bool
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'version_random_case' => false, # bool
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'uri_dir_self_reference' => false, # bool
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'uri_dir_fake_relative' => false, # bool
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'uri_use_backslashes' => false, # bool
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'pad_fake_headers' => false, # bool
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'pad_fake_headers_count' => 16, # integer
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'pad_get_params' => false, # bool
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'pad_get_params_count' => 8, # integer
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'pad_post_params' => false, # bool
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'pad_post_params_count' => 8, # integer
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'uri_fake_end' => false, # bool
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'uri_fake_params_start' => false, # bool
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'header_folding' => false, # bool
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'chunked_size' => 0 # integer
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}
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# This is not used right now...
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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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typ = self.config_types[var] || 'string'
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if(typ.class.to_s == '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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if(typ == 'bool')
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val = (val =~ /^(t|y|1)$/i ? true : false)
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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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def request_raw(opts={})
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c_enc = opts['encode'] || false
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c_uri = opts['uri'] || '/'
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c_body = opts['data'] || ''
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c_meth = opts['method'] || 'GET'
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c_prot = opts['proto'] || 'HTTP'
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c_vers = opts['version'] || config['version'] || '1.1'
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c_qs = opts['query']
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c_ag = opts['agent'] || config['agent']
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c_cook = opts['cookie'] || config['cookie']
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c_host = opts['vhost'] || config['vhost'] || self.hostname
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c_head = opts['headers'] || config['headers'] || {}
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c_rawh = opts['raw_headers']|| config['raw_headers'] || ''
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c_conn = opts['connection']
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c_auth = opts['basic_auth'] || config['basic_auth'] || ''
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uri = set_uri(c_uri)
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req = ''
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req << set_method(c_meth)
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req << set_method_uri_spacer()
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req << set_uri_prepend()
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req << (c_enc ? set_encode_uri(uri) : uri)
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if (c_qs)
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req << '?'
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req << (c_enc ? set_encode_qs(c_qs) : c_qs)
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end
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req << set_uri_append()
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req << set_uri_version_spacer()
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req << set_version(c_prot, c_vers)
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req << set_host_header(c_host)
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req << set_agent_header(c_ag)
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if (c_auth.length > 0)
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req << set_basic_auth_header(c_auth)
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end
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req << set_cookie_header(c_cook)
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req << set_connection_header(c_conn)
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req << set_extra_headers(c_head)
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req << set_raw_headers(c_rawh)
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req << set_body(c_body)
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req
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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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def request_cgi(opts={})
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c_enc = opts['encode'] || false
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c_cgi = opts['uri'] || '/'
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c_body = opts['data'] || ''
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c_meth = opts['method'] || 'GET'
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c_prot = opts['proto'] || 'HTTP'
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c_vers = opts['version'] || config['version'] || '1.1'
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c_qs = opts['query'] || ''
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c_varg = opts['vars_get'] || {}
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c_varp = opts['vars_post'] || {}
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c_head = opts['headers'] || config['headers'] || {}
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c_rawh = opts['raw_headers']|| config['raw_headers'] || ''
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c_type = opts['ctype'] || 'application/x-www-form-urlencoded'
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c_ag = opts['agent'] || config['agent']
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c_cook = opts['cookie'] || config['cookie']
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c_host = opts['vhost'] || config['vhost']
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c_conn = opts['connection']
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c_path = opts['path_info']
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c_auth = opts['basic_auth'] || config['basic_auth'] || ''
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uri = set_cgi(c_cgi)
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qstr = c_qs
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pstr = c_body
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if (config['pad_get_params'])
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1.upto(config['pad_get_params_count'].to_i) do |i|
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qstr << '&' if qstr.length > 0
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qstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
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qstr << '='
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qstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
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end
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end
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c_varg.each_pair do |var,val|
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qstr << '&' if qstr.length > 0
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qstr << set_encode_uri(var)
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qstr << '='
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qstr << set_encode_uri(val)
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end
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if (config['pad_post_params'])
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1.upto(config['pad_post_params_count'].to_i) do |i|
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pstr << '&' if qstr.length > 0
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pstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
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pstr << '='
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pstr << set_encode_uri(Rex::Text.rand_text_alphanumeric(rand(32)+1))
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end
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end
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c_varp.each_pair do |var,val|
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pstr << '&' if pstr.length > 0
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pstr << set_encode_uri(var)
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pstr << '='
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pstr << set_encode_uri(val)
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end
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req = ''
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req << set_method(c_meth)
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req << set_method_uri_spacer()
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req << set_uri_prepend()
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req << (c_enc ? set_encode_uri(uri):uri)
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if (qstr.length > 0)
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req << '?'
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req << qstr
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end
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req << set_path_info(c_path)
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req << set_uri_append()
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req << set_uri_version_spacer()
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req << set_version(c_prot, c_vers)
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req << set_host_header(c_host)
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req << set_agent_header(c_ag)
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if (c_auth.length > 0)
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req << set_basic_auth_header(c_auth)
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end
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req << set_cookie_header(c_cook)
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req << set_connection_header(c_conn)
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req << set_extra_headers(c_head)
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req << set_content_type_header(c_type)
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req << set_content_len_header(pstr.length)
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req << set_chunked_header()
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req << set_raw_headers(c_rawh)
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req << set_body(pstr)
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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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def connect
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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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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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)
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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
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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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# Transmit an HTTP request and receive the response
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# If persist is set, then the request will attempt
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# to reuse an existing connection.
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#
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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)
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read_response(t)
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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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def send_request(req)
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connect
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conn.put(req.to_s)
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end
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#
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# Read a response from the server
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#
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def read_response(t = -1)
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resp = Response.new
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resp.max_data = config['read_max_data']
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# Wait at most t seconds for the full response to be read in. We only
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# do this if t was specified as a negative value indicating an infinite
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# wait cycle. If t were specified as nil it would indicate that no
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# response parsing is required.
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return resp if not t
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Timeout.timeout((t < 0) ? nil : t) do
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rv = nil
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while (
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rv != Packet::ParseCode::Completed and
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rv != Packet::ParseCode::Error
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)
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begin
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buff = conn.get_once(-1, 1)
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rv = resp.parse( buff || '')
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##########################################################################
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# XXX: NOTE: BUG: get_once currently (as of r10042) rescues "Exception"
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# As such, the following rescue block will ever be reached. -jjd
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##########################################################################
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# Handle unexpected disconnects
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rescue ::Errno::EPIPE, ::EOFError, ::IOError
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case resp.state
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when Packet::ParseState::ProcessingHeader
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resp = nil
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when Packet::ParseState::ProcessingBody
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# truncated request, good enough
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resp.error = :truncated
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end
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break
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end
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# This is a dirty hack for broken HTTP servers
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if rv == Packet::ParseCode::Completed
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rbody = resp.body
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rbufq = resp.bufq
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rblob = rbody.to_s + rbufq.to_s
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tries = 0
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begin
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# XXX This doesn't deal with chunked encoding or "Content-type: text/html; charset=..."
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while tries < 1000 and resp.headers["Content-Type"]== "text/html" and rblob !~ /<\/html>/i
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buff = conn.get_once(-1, 0.05)
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break if not buff
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rblob += buff
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tries += 1
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end
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rescue ::Errno::EPIPE, ::EOFError, ::IOError
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end
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resp.bufq = ""
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resp.body = rblob
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end
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end
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end
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resp
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end
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#
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# Read a response from the server (starting with existing data)
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#
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def reread_response(resp, t = -1)
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resp.max_data = config['read_max_data']
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resp.reset_except_queue
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resp.parse('')
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# Wait at most t seconds for the full response to be read in. We only
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# do this if t was specified as a negative value indicating an infinite
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# wait cycle. If t were specified as nil it would indicate that no
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# response parsing is required.
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return resp if not t
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Timeout.timeout((t < 0) ? nil : t) do
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rv = resp.state
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while (
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rv != Packet::ParseCode::Completed and
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rv != Packet::ParseCode::Error
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)
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begin
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buff = conn.get
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rv = resp.parse( buff || '')
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# Handle unexpected disconnects
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rescue ::Errno::EPIPE, ::EOFError, ::IOError
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case resp.state
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when Packet::ParseState::ProcessingHeader
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resp = nil
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when Packet::ParseState::ProcessingBody
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# truncated request, good enough
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resp.error = :truncated
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end
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break
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end
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end
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end
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resp
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end
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#
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# Cleans up any outstanding connections and other resources.
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#
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def stop
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close
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end
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#
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# Returns whether or not the conn is valid.
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#
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def conn?
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conn != nil
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end
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#
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# Whether or not connections should be pipelined.
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#
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def pipelining?
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pipeline
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end
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#
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# Return the encoded URI
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# ['none','hex-normal', 'hex-all', 'u-normal', 'u-all']
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def set_encode_uri(uri)
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a = uri
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self.config['uri_encode_count'].times {
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a = Rex::Text.uri_encode(a, self.config['uri_encode_mode'])
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}
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return a
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end
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|
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#
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# Return the encoded query string
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#
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def set_encode_qs(qs)
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a = qs
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self.config['uri_encode_count'].times {
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a = Rex::Text.uri_encode(a, self.config['uri_encode_mode'])
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}
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return a
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end
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|
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#
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# Return the uri
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#
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def set_uri(uri)
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if (self.config['uri_dir_self_reference'])
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uri.gsub!('/', '/./')
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end
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if (self.config['uri_dir_fake_relative'])
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buf = ""
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uri.split('/').each do |part|
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cnt = rand(8)+2
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1.upto(cnt) { |idx|
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buf << "/" + Rex::Text.rand_text_alphanumeric(rand(32)+1)
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}
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buf << ("/.." * cnt)
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buf << "/" + part
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end
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uri = buf
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end
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if (self.config['uri_full_url'])
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url = self.ssl ? "https" : "http"
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url << self.config['vhost']
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url << ((self.port == 80) ? "" : ":#{self.port}")
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url << uri
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url
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else
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uri
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end
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end
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|
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#
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# Return the cgi
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#
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def set_cgi(uri)
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|
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if (self.config['uri_dir_self_reference'])
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uri.gsub!('/', '/./')
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end
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|
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if (self.config['uri_dir_fake_relative'])
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buf = ""
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uri.split('/').each do |part|
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cnt = rand(8)+2
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1.upto(cnt) { |idx|
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buf << "/" + Rex::Text.rand_text_alphanumeric(rand(32)+1)
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}
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buf << ("/.." * cnt)
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buf << "/" + part
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end
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uri = buf
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end
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url = uri
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if (self.config['uri_full_url'])
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url = self.ssl ? "https" : "http"
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url << self.config['vhost']
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url << (self.port == 80) ? "" : ":#{self.port}"
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url << uri
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end
|
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|
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url
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end
|
|
|
|
#
|
|
# Return the HTTP method string
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the HTTP version string
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the HTTP seperator and body string
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the HTTP path info
|
|
# TODO:
|
|
# * Encode path information
|
|
def set_path_info(path)
|
|
path ? path : ''
|
|
end
|
|
|
|
#
|
|
# Return the spacing between the method and uri
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the spacing between the uri and the version
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the padding to place before the uri
|
|
#
|
|
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
|
|
|
|
#
|
|
# Return the padding to place before the uri
|
|
#
|
|
def set_uri_append
|
|
# TODO:
|
|
# * Support different padding types
|
|
""
|
|
end
|
|
|
|
#
|
|
# Return the HTTP Host header
|
|
#
|
|
def set_host_header(host)
|
|
return "" if self.config['uri_full_url']
|
|
host ||= self.config['vhost']
|
|
set_formatted_header("Host", host)
|
|
end
|
|
|
|
#
|
|
# Return the HTTP agent header
|
|
#
|
|
def set_agent_header(agent)
|
|
agent ? set_formatted_header("User-Agent", agent) : ""
|
|
end
|
|
|
|
#
|
|
# Return the HTTP cookie header
|
|
#
|
|
def set_cookie_header(cookie)
|
|
cookie ? set_formatted_header("Cookie", cookie) : ""
|
|
end
|
|
|
|
#
|
|
# Return the HTTP connection header
|
|
#
|
|
def set_connection_header(conn)
|
|
conn ? set_formatted_header("Connection", conn) : ""
|
|
end
|
|
|
|
#
|
|
# Return the content type header
|
|
#
|
|
def set_content_type_header(ctype)
|
|
set_formatted_header("Content-Type", ctype)
|
|
end
|
|
|
|
#
|
|
# Return the content length header
|
|
def set_content_len_header(clen)
|
|
return "" if self.config['chunked_size'] > 0
|
|
set_formatted_header("Content-Length", clen)
|
|
end
|
|
|
|
#
|
|
# Return the Authorization basic-auth header
|
|
#
|
|
def set_basic_auth_header(auth)
|
|
auth ? set_formatted_header("Authorization", "Basic " + Rex::Text.encode_base64(auth)) : ""
|
|
end
|
|
|
|
#
|
|
# Return a string of formatted extra headers
|
|
#
|
|
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
|
|
|
|
def set_chunked_header()
|
|
return "" if self.config['chunked_size'] == 0
|
|
set_formatted_header('Transfer-Encoding', 'chunked')
|
|
end
|
|
|
|
#
|
|
# Return a string of raw header data
|
|
#
|
|
def set_raw_headers(data)
|
|
data
|
|
end
|
|
|
|
#
|
|
# Return a formatted header string
|
|
#
|
|
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
|
|
|
|
|
|
|
|
#
|
|
# 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
|
|
|
|
|
|
# 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
|
|
|