Module: Msf::Exploit::Remote::HttpClient

Overview

This module provides methods for acting as an HTTP client when exploiting an HTTP server.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Auxiliary::Report

#active_db?, #create_cracked_credential, #create_credential, #create_credential_and_login, #create_credential_login, #db, #db_warning_given?, #get_client, #get_host, #inside_workspace_boundary?, #invalidate_login, #mytask, #myworkspace, #myworkspace_id, #report_auth_info, #report_client, #report_exploit, #report_host, #report_loot, #report_note, #report_service, #report_vuln, #report_web_form, #report_web_page, #report_web_site, #report_web_vuln, #store_cred, #store_local, #store_loot

Methods included from Metasploit::Framework::Require

optionally, optionally_active_record_railtie, optionally_include_metasploit_credential_creation, #optionally_include_metasploit_credential_creation, optionally_require_metasploit_db_gem_engines

Instance Attribute Details

#clientObject (protected)

Returns the value of attribute client


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# File 'lib/msf/core/exploit/http/client.rb', line 872

def client
  @client
end

Instance Method Details

#basic_auth(username, password) ⇒ Object

Combine the user/pass into an auth string for the HTTP Client


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# File 'lib/msf/core/exploit/http/client.rb', line 454

def basic_auth(username, password)
  auth_str = Rex::Text.encode_base64("#{username}:#{password}")
  "Basic #{auth_str}"
end

#cleanupObject

Performs cleanup as necessary, disconnecting the HTTP client if it's still established.


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# File 'lib/msf/core/exploit/http/client.rb', line 307

def cleanup
  super
  disconnect
end

#configure_http_login_scanner(conf) ⇒ Object

Converts datastore options into configuration parameters for the Metasploit::LoginScanner::Http class. Any parameters passed into this method will override the defaults.


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# File 'lib/msf/core/exploit/http/client.rb', line 226

def (conf)
  {
    host:                          rhost,
    port:                          rport,
    ssl:                           ssl,
    ssl_version:                   ssl_version,
    proxies:                       datastore['PROXIES'],
    framework:                     framework,
    framework_module:              self,
    vhost:                         vhost,
    user_agent:                    datastore['UserAgent'],
    evade_uri_encode_mode:         datastore['HTTP::uri_encode_mode'],
    evade_uri_full_url:            datastore['HTTP::uri_full_url'],
    evade_pad_method_uri_count:    datastore['HTTP::pad_method_uri_count'],
    evade_pad_uri_version_count:   datastore['HTTP::pad_uri_version_count'],
    evade_pad_method_uri_type:     datastore['HTTP::pad_method_uri_type'],
    evade_pad_uri_version_type:    datastore['HTTP::pad_uri_version_type'],
    evade_method_random_valid:     datastore['HTTP::method_random_valid'],
    evade_method_random_invalid:   datastore['HTTP::method_random_invalid'],
    evade_method_random_case:      datastore['HTTP::method_random_case'],
    evade_version_random_valid:    datastore['HTTP::version_random_valid'],
    evade_version_random_invalid:  datastore['HTTP::version_random_invalid'],
    evade_uri_dir_self_reference:  datastore['HTTP::uri_dir_self_reference'],
    evade_uri_dir_fake_relative:   datastore['HTTP::uri_dir_fake_relative'],
    evade_uri_use_backslashes:     datastore['HTTP::uri_use_backslashes'],
    evade_pad_fake_headers:        datastore['HTTP::pad_fake_headers'],
    evade_pad_fake_headers_count:  datastore['HTTP::pad_fake_headers_count'],
    evade_pad_get_params:          datastore['HTTP::pad_get_params'],
    evade_pad_get_params_count:    datastore['HTTP::pad_get_params_count'],
    evade_pad_post_params:         datastore['HTTP::pad_post_params'],
    evade_pad_post_params_count:   datastore['HTTP::pad_post_params_count'],
    evade_uri_fake_end:            datastore['HTTP::uri_fake_end'],
    evade_uri_fake_params_start:   datastore['HTTP::uri_fake_params_start'],
    evade_header_folding:          datastore['HTTP::header_folding'],
    ntlm_domain:                   datastore['DOMAIN'],
    digest_auth_iis:               datastore['DigestAuthIIS']
  }.merge(conf)
end

#connect(opts = {}) ⇒ Object

Connects to an HTTP server.


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# File 'lib/msf/core/exploit/http/client.rb', line 142

def connect(opts={})
  dossl = false
  if(opts.has_key?('SSL'))
    dossl = opts['SSL']
  else
    dossl = ssl
  end

  client_username = opts['username'] || datastore['HttpUsername'] || ''
  client_password = opts['password'] || datastore['HttpPassword'] || ''

  nclient = Rex::Proto::Http::Client.new(
    opts['rhost'] || rhost,
    (opts['rport'] || rport).to_i,
    {
      'Msf'        => framework,
      'MsfExploit' => self,
    },
    dossl,
    ssl_version,
    proxies,
    client_username,
    client_password
  )

  # Configure the HTTP client with the supplied parameter
  nclient.set_config(
    'vhost' => opts['vhost'] || opts['rhost'] || self.vhost(),
    'agent' => datastore['UserAgent'],
    'partial' => opts['partial'] || datastore['HttpPartialResponses'],
    'uri_encode_mode'        => datastore['HTTP::uri_encode_mode'],
    'uri_full_url'           => datastore['HTTP::uri_full_url'],
    'pad_method_uri_count'   => datastore['HTTP::pad_method_uri_count'],
    'pad_uri_version_count'  => datastore['HTTP::pad_uri_version_count'],
    'pad_method_uri_type'    => datastore['HTTP::pad_method_uri_type'],
    'pad_uri_version_type'   => datastore['HTTP::pad_uri_version_type'],
    'method_random_valid'    => datastore['HTTP::method_random_valid'],
    'method_random_invalid'  => datastore['HTTP::method_random_invalid'],
    'method_random_case'     => datastore['HTTP::method_random_case'],
    'version_random_valid'   => datastore['HTTP::version_random_valid'],
    'version_random_invalid' => datastore['HTTP::version_random_invalid'],
    'uri_dir_self_reference' => datastore['HTTP::uri_dir_self_reference'],
    'uri_dir_fake_relative'  => datastore['HTTP::uri_dir_fake_relative'],
    'uri_use_backslashes'    => datastore['HTTP::uri_use_backslashes'],
    'pad_fake_headers'       => datastore['HTTP::pad_fake_headers'],
    'pad_fake_headers_count' => datastore['HTTP::pad_fake_headers_count'],
    'pad_get_params'         => datastore['HTTP::pad_get_params'],
    'pad_get_params_count'   => datastore['HTTP::pad_get_params_count'],
    'pad_post_params'        => datastore['HTTP::pad_post_params'],
    'pad_post_params_count'  => datastore['HTTP::pad_post_params_count'],
    'uri_fake_end'           => datastore['HTTP::uri_fake_end'],
    'uri_fake_params_start'  => datastore['HTTP::uri_fake_params_start'],
    'header_folding'         => datastore['HTTP::header_folding'],
    'domain'                 => datastore['DOMAIN'],
    'DigestAuthIIS'          => datastore['DigestAuthIIS']
  )

  # NOTE: Please use opts['headers'] to programmatically set headers
  if datastore['HttpRawHeaders'] && File.readable?(datastore['HttpRawHeaders'])
    # Templatize with ERB
    headers = ERB.new(File.read(datastore['HttpRawHeaders'])).result(binding)

    # Append templatized headers to existing headers
    nclient.set_config('raw_headers' => headers)
  end

  # If this connection is global, persist it
  # Required for findsock on these sockets
  if (opts['global'])
    if (self.client)
      disconnect
    end
  end

  self.client = nclient

  return nclient
end

#deregister_http_client_optionsObject


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# File 'lib/msf/core/exploit/http/client.rb', line 93

def deregister_http_client_options
  deregister_options('RHOST', 'RPORT', 'VHOST', 'SSL', 'Proxies')
end

#disconnect(nclient = self.client) ⇒ Object

Disconnects the HTTP client


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# File 'lib/msf/core/exploit/http/client.rb', line 289

def disconnect(nclient = self.client)
  if (nclient)
    nclient.close
  end

  if (nclient == self.client)
    if self.client.respond_to?(:close)
      self.client.close
    end

    self.client = nil
  end
end

#download(url) ⇒ Object

Downloads a URL


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# File 'lib/msf/core/exploit/http/client.rb', line 572

def download(url)
  print_status "Downloading '#{url}'"

  begin
    target = URI.parse url
    raise 'Invalid URL' unless target.scheme =~ /https?/
    raise 'Invalid URL' if target.host.to_s.eql? ''
  rescue => e
    print_error "Could not parse URL: #{e}"
    return nil
  end

  res = request_url(url)

  unless res
    print_error 'Connection failed'
    return nil
  end

  print_status "- HTTP #{res.code} - #{res.body.length} bytes"

  res.code == 200 ? res.body : nil
end

#full_uri(custom_uri = nil, vhost_uri: false) ⇒ Object

Returns the complete URI as string including the scheme, port and host


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# File 'lib/msf/core/exploit/http/client.rb', line 481

def full_uri(custom_uri = nil, vhost_uri: false)
  uri_scheme = ssl ? 'https' : 'http'

  if (rport == 80 && !ssl) || (rport == 443 && ssl)
    uri_port = ''
  else
    uri_port = ":#{rport}"
  end

  uri = normalize_uri(custom_uri || target_uri.to_s)

  if vhost_uri && datastore['VHOST']
    uri_host = datastore['VHOST']
  elsif Rex::Socket.is_ipv6?(rhost)
    uri_host = "[#{rhost}]"
  else
    uri_host = rhost
  end

  "#{uri_scheme}://#{uri_host}#{uri_port}#{uri}"
end

#handler(nsock = nil) ⇒ Object

Passes the client connection down to the handler to see if it's of any use.


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# File 'lib/msf/core/exploit/http/client.rb', line 269

def handler(nsock = nil)
  # If no socket was provided, try the global one.
  if ((!nsock) and (self.client))
    nsock = self.client.conn
  end

  # If the parent claims the socket associated with the HTTP client, then
  # we rip the socket out from under the HTTP client.
  if (((rv = super(nsock)) == Handler::Claimed) and
      (self.client) and
      (nsock == self.client.conn))
    self.client.conn = nil
  end

  rv
end

#http_fingerprint(opts = {}) ⇒ String

Record various things about an HTTP server that we can glean from the response to a single request. If this method is passed a response, it will use it directly, otherwise it will check the database for a previous fingerprint. Failing that, it will make a request for /.

Other options are passed directly to #connect if :response is not given

Parameters:

  • opts (Hash) (defaults to: {})

    a customizable set of options

Options Hash (opts):

  • :response (Rex::Proto::Http::Packet)

    The return value from any of the send_* methods

  • :uri (String) — default: '/'

    An HTTP URI to request in order to generate a fingerprint

  • :method (String) — default: 'GET'

    An HTTP method to use in the fingerprint request

  • :full (Boolean) — default: false

    Request the full HTTP fingerprint, not just the signature

Returns:

  • (String)

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# File 'lib/msf/core/exploit/http/client.rb', line 706

def http_fingerprint(opts={})
  res    = nil
  uri    = opts[:uri] || '/'
  method = opts[:method] || 'GET'

  # Short-circuit the fingerprint lookup and HTTP request if a response has
  # already been provided by the caller.
  if opts[:response]
    res = opts[:response]
  else
    fprints = lookup_http_fingerprints(opts)

    if fprints.length > 0

      # Grab the most recent fingerprint available for this service, uri, and method
      fprint = fprints.last

      # Return the full HTTP fingerprint if requested by the caller
      return fprint if opts[:full]

      # Otherwise just return the signature string for compatibility
      return fprint[:signature]
    end

    # Go ahead and send a request to the target for fingerprinting
    connect(opts)
    res = send_request_raw(
      {
        'uri'     => uri,
        'method'  => method
      }) rescue nil
  end

  # Bail if the request did not receive a readable response
  return if not res

  # This section handles a few simple cases of pattern matching and service
  # classification. This logic should be deprecated in favor of Recog-based
  # fingerprint databases, but has been left in place for backward compat.

  extras = []

  if res.headers['Set-Cookie'] =~ /^vmware_soap_session/
    extras << "VMWare Web Services"
  end

  if (res.headers['X-Powered-By'])
    extras << "Powered by " + res.headers['X-Powered-By']
  end

  if (res.headers['Via'])
    extras << "Via-" + res.headers['Via']
  end

  if (res.headers['X-AspNet-Version'])
    extras << "AspNet-Version-" + res.headers['X-AspNet-Version']
  end

  case res.body
    when nil
      # Nothing
    when /openAboutWindow.*\>DD\-WRT ([^\<]+)\<|Authorization.*please note that the default username is \"root\" in/
      extras << "DD-WRT #{$1.to_s.strip}".strip

    when /ID_ESX_Welcome/, /ID_ESX_VIClientDesc/
      extras << "VMware ESX Server"

    when /Test Page for.*Fedora/
      extras << "Fedora Default Page"

    when /Placeholder page/
      extras << "Debian Default Page"

    when /Welcome to Windows Small Business Server (\d+)/
      extras << "Windows SBS #{$1}"

    when /[email protected]/
      extras << "Asterisk"

    when /swfs\/Shell\.html/
      extras << "BPS-1000"
  end

  if datastore['RPORT'].to_i == 3790
    if res.code == 302 and res.headers and res.headers['Location'] =~ /[\x5c\x2f](login|setup)$/n
      if res['Server'] =~ /^(thin.*No Hup)|(nginx[\x5c\x2f][\d\.]+)$/n
        extras << "Metasploit"
      end
    end
  end

  #
  # This HTTP response code tracking is used by a few modules and the MSP logic
  # to identify and bruteforce certain types of servers. In the long run we
  # should deprecate this and use the http.fingerprint fields instead.
  #
  case res.code
  when 301,302
    extras << "#{res.code}-#{res.headers['Location']}"
  when 401
    extras << "#{res.code}-#{res.headers['WWW-Authenticate']}"
  when 403
    extras << "#{res.code}-#{res.headers['WWW-Authenticate']||res.message}"
  when 500 .. 599
    extras << "#{res.code}-#{res.message}"
  end

  # Build a human-readable string to store in service.info and http.fingerprint[:signature]
  info = res.headers['Server'].to_s.dup
  info << " ( #{extras.join(", ")} )" if extras.length > 0

  # Create a new fingerprint structure to track this response
  fprint = {
    :uri => uri, :method => method, :server_port => rport,
    :code => res.code.to_s, :message => res.message.to_s,
    :signature => info
  }

  res.headers.each_pair do |k,v|
    hname = k.to_s.downcase.tr('-', '_').gsub(/[^a-z0-9_]+/, '')
    next unless hname.length > 0

    # Set-Cookie >        :header_set_cookie       => JSESSIONID=AAASD23423452
    # Server >            :header_server           => Apache/1.3.37
    # WWW-Authenticate >  :header_www_authenticate => basic realm='www'

    fprint["header_#{hname}".intern] = v
  end

  # Store the first 64k of the HTTP body as well
  fprint[:content] = res.body.to_s[0,65535]

  # Report a new http.fingerprint note
  report_note(
    :host   => rhost,
    :port   => rport,
    :proto  => 'tcp',
    :ntype  => 'http.fingerprint',
    :data   => fprint,
    # Limit reporting to one stored note per host/service combination
    :update => :unique
  )

  # Report here even if info is empty since the fact that we didn't
  # return early means we at least got a connection and the service is up
  report_web_site(:host => rhost, :port => rport, :ssl => ssl, :vhost => vhost, :info => info.dup)

  # Return the full HTTP fingerprint if requested by the caller
  return fprint if opts[:full]

  # Otherwise just return the signature string for compatibility
  fprint[:signature]
end

#initialize(info = {}) ⇒ Object

Initializes an exploit module that exploits a vulnerability in an HTTP server.


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# File 'lib/msf/core/exploit/http/client.rb', line 20

def initialize(info = {})
  super

  register_options(
    [
      Opt::RHOST,
      Opt::RPORT(80),
      OptString.new('VHOST', [ false, "HTTP server virtual host" ]),
      OptBool.new('SSL', [ false, 'Negotiate SSL/TLS for outgoing connections', false]),
      Opt::Proxies
    ], self.class
  )

  if framework.features.enabled?("RHOST_HTTP_URL")
    register_options([Opt::RHOST_HTTP_URL])
  end

  register_advanced_options(
    [
      OptString.new('UserAgent', [false, 'The User-Agent header to use for all requests',
        Rex::Proto::Http::Client::DefaultUserAgent
        ]),
      OptString.new('HttpUsername', [false, 'The HTTP username to specify for authentication', '']),
      OptString.new('HttpPassword', [false, 'The HTTP password to specify for authentication', '']),
      OptPath.new('HttpRawHeaders', [false, 'Path to ERB-templatized raw headers to append to existing headers']),
      OptBool.new('DigestAuthIIS', [false, 'Conform to IIS, should work for most servers. Only set to false for non-IIS servers', true]),
      Opt::SSLVersion,
      OptBool.new('FingerprintCheck', [ false, 'Conduct a pre-exploit fingerprint verification', true]),
      OptString.new('DOMAIN', [ true, 'The domain to use for Windows authentication', 'WORKSTATION']),
      OptFloat.new('HttpClientTimeout', [false, 'HTTP connection and receive timeout']),
      OptBool.new('HttpPartialResponses', [false, 'Return partial HTTP responses despite timeouts', false]),
      OptBool.new('HttpTrace', [false, 'Show the raw HTTP requests and responses', false]),
      OptBool.new('HttpTraceHeadersOnly', [false, 'Show HTTP headers only in HttpTrace', false]),
      OptString.new('HttpTraceColors', [false, 'HTTP request and response colors for HttpTrace (unset to disable)', 'red/blu'])
    ], self.class
  )

  register_evasion_options(
    [
      OptEnum.new('HTTP::uri_encode_mode', [false, 'Enable URI encoding', 'hex-normal', ['none', 'hex-normal', 'hex-noslashes', 'hex-random', 'hex-all', 'u-normal', 'u-all', 'u-random']]),
      OptBool.new('HTTP::uri_full_url', [false, 'Use the full URL for all HTTP requests', false]),
      OptInt.new('HTTP::pad_method_uri_count', [false, 'How many whitespace characters to use between the method and uri', 1]),
      OptInt.new('HTTP::pad_uri_version_count', [false, 'How many whitespace characters to use between the uri and version', 1]),
      OptEnum.new('HTTP::pad_method_uri_type', [false, 'What type of whitespace to use between the method and uri', 'space', ['space', 'tab', 'apache']]),
      OptEnum.new('HTTP::pad_uri_version_type', [false, 'What type of whitespace to use between the uri and version', 'space', ['space', 'tab', 'apache']]),
      OptBool.new('HTTP::method_random_valid', [false, 'Use a random, but valid, HTTP method for request', false]),
      OptBool.new('HTTP::method_random_invalid', [false, 'Use a random invalid, HTTP method for request', false]),
      OptBool.new('HTTP::method_random_case', [false, 'Use random casing for the HTTP method', false]),
      OptBool.new('HTTP::version_random_valid', [false, 'Use a random, but valid, HTTP version for request', false]),
      OptBool.new('HTTP::version_random_invalid', [false, 'Use a random invalid, HTTP version for request', false]),
      OptBool.new('HTTP::uri_dir_self_reference', [false, 'Insert self-referential directories into the uri', false]),
      OptBool.new('HTTP::uri_dir_fake_relative', [false, 'Insert fake relative directories into the uri', false]),
      OptBool.new('HTTP::uri_use_backslashes', [false, 'Use back slashes instead of forward slashes in the uri ', false]),
      OptBool.new('HTTP::pad_fake_headers', [false, 'Insert random, fake headers into the HTTP request', false]),
      OptInt.new('HTTP::pad_fake_headers_count', [false, 'How many fake headers to insert into the HTTP request', 0]),
      OptBool.new('HTTP::pad_get_params', [false, 'Insert random, fake query string variables into the request', false]),
      OptInt.new('HTTP::pad_get_params_count', [false, 'How many fake query string variables to insert into the request', 16]),
      OptBool.new('HTTP::pad_post_params', [false, 'Insert random, fake post variables into the request', false]),
      OptInt.new('HTTP::pad_post_params_count', [false, 'How many fake post variables to insert into the request', 16]),
      OptBool.new('HTTP::uri_fake_end', [false, 'Add a fake end of URI (eg: /%20HTTP/1.0/../../)', false]),
      OptBool.new('HTTP::uri_fake_params_start', [false, 'Add a fake start of params to the URI (eg: /%3fa=b/../)', false]),
      OptBool.new('HTTP::header_folding', [false, 'Enable folding of HTTP headers', false])
#
# Remaining evasions to implement
#
#        OptBool.new('HTTP::chunked', [false, 'Enable chunking of HTTP request via "Transfer-Encoding: chunked"', false]),
#        OptInt.new('HTTP::junk_pipeline', [true, 'Insert the specified number of junk pipeline requests', 0]),
    ], self.class
  )
  register_autofilter_ports([ 80, 8080, 443, 8000, 8888, 8880, 8008, 3000, 8443 ])
  register_autofilter_services(%W{ http https })
end

#lookup_http_fingerprints(opts = {}) ⇒ Object

Lookup HTTP fingerprints from the database that match the current destination host and port. This method falls back to using the old service.info field to represent the HTTP Server header.

Parameters:

  • opts (Hash) (defaults to: {})

    a customizable set of options

Options Hash (opts):

  • :uri (String) — default: '/'

    An HTTP URI to request in order to generate a fingerprint

  • :method (String) — default: 'GET'

    An HTTP method to use in the fingerprint request


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# File 'lib/msf/core/exploit/http/client.rb', line 662

def lookup_http_fingerprints(opts={})
  uri     = opts[:uri] || '/'
  method  = opts[:method] || 'GET'
  fprints = []

  return fprints unless framework.db.active

  ::ApplicationRecord.connection_pool.with_connection {
    wspace = datastore['WORKSPACE'] ?
      framework.db.find_workspace(datastore['WORKSPACE']) : framework.db.workspace

    service = framework.db.get_service(wspace, rhost, 'tcp', rport)
    return fprints unless service

    # Order by note_id descending so the first value is the most recent
    service.notes.where(:ntype => 'http.fingerprint').order("notes.id DESC").each do |n|
      next unless n.data && n.data.kind_of?(::Hash)
      next unless n.data[:uri] == uri && n.data[:method] == method
      # Append additional fingerprints to the results as found
      fprints.unshift n.data.dup
    end
  }

  fprints
end

#normalize_uri(*strs) ⇒ Object

Returns a modified version of the URI that:

  1. Always has a starting slash

  2. Removes all the double slashes


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# File 'lib/msf/core/exploit/http/client.rb', line 508

def normalize_uri(*strs)
  new_str = strs * "/"

  new_str = new_str.gsub!("//", "/") while new_str.index("//")

  # Makes sure there's a starting slash
  unless new_str[0,1] == '/'
    new_str = '/' + new_str
  end

  new_str
end

#path_from_uri(uri) ⇒ Object

Returns the Path+Query from a full URI String, nil on error


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# File 'lib/msf/core/exploit/http/client.rb', line 522

def path_from_uri(uri)
  begin
    temp = URI(uri)
    ret_uri = temp.path
    ret_uri << "?#{temp.query}" unless temp.query.nil? or temp.query.empty?
    return ret_uri
  rescue URI::Error
    print_error "Invalid URI: #{uri}"
    return nil
  end
end

#peerObject

Returns the Host and Port as a string


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# File 'lib/msf/core/exploit/http/client.rb', line 620

def peer
  "#{rhost}:#{rport}"
end

#proxiesObject

Returns the configured proxy list


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# File 'lib/msf/core/exploit/http/client.rb', line 648

def proxies
  datastore['Proxies']
end

#reconfig_redirect_opts!(res, opts) ⇒ void

This method returns an undefined value.

Modifies the HTTP request options for a redirection.

Parameters:

  • res (Rex::Proto::HTTP::Response)

    HTTP Response.

  • opts (Hash)

    The HTTP request options to modify.


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# File 'lib/msf/core/exploit/http/client.rb', line 413

def reconfig_redirect_opts!(res, opts)
  location = res.redirection

  if location.relative?
    if location.path.start_with?('/')
      # path starting with /, not relative to the current path, but starts from the root
      opts['redirect_uri'] = location.path
      opts['uri'] = location.path
    else
      parent_path = File.dirname(opts['uri'].to_s)
      parent_path = '/' if parent_path == '.'
      new_redirect_uri = normalize_uri(parent_path, location.path.gsub(/^\./, ''))
      opts['redirect_uri'] = new_redirect_uri
      opts['uri'] = new_redirect_uri
    end
    
    opts['rhost'] = datastore['RHOST']
    opts['vhost'] = opts['vhost'] || opts['rhost'] || self.vhost()
    opts['rport'] = datastore['RPORT']

    opts['SSL'] = ssl
  else
    disconnect

    opts['redirect_uri'] = location
    opts['uri'] = location.path
    opts['rhost'] = location.host
    opts['vhost'] = location.host
    opts['rport'] = location.port

    if location.scheme == 'https'
      opts['SSL'] = true
    else
      opts['SSL'] = false
    end
  end
end

#request_opts_from_url(url) ⇒ Object

Returns a hash of request opts from a URL string


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# File 'lib/msf/core/exploit/http/client.rb', line 536

def request_opts_from_url(url)
  # verify and extract components from the URL
  begin
    tgt = URI.parse(url)
    raise 'Invalid URL' unless tgt.scheme =~ %r{https?}
    raise 'Invalid URL' if tgt.host.to_s.eql? ''
  rescue => e
    print_error "Could not parse URL: #{e}"
    return nil
  end

  opts = { 'rhost' => tgt.host, 'rport' => tgt.port, 'uri' => tgt.request_uri }
  opts['SSL'] = true if tgt.scheme == 'https'
  if tgt.query and tgt.query.size > 13
    # Assming that this is going to be mostly used for GET requests as string -> req
    opts['vars_get'] = {}
    tgt.query.split('&').each do |pair|
      k,v = pair.split('=',2)
      opts['vars_get'][k] = v
    end
  end
  return opts
end

#request_url(url, keepalive = false) ⇒ Object

Returns response from a simple URL call


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# File 'lib/msf/core/exploit/http/client.rb', line 562

def request_url(url, keepalive = false)
  opts = request_opts_from_url(url)
  return nil if opts.nil?
  res = send_request_raw(opts)
  disconnect unless keepalive
  return res
end

#rhostObject

Returns the target host


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# File 'lib/msf/core/exploit/http/client.rb', line 606

def rhost
  datastore['RHOST']
end

#rportObject

Returns the remote port


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# File 'lib/msf/core/exploit/http/client.rb', line 613

def rport
  datastore['RPORT']
end

#send_request_cgi(opts = {}, timeout = 20, disconnect = true) ⇒ Object

Connects to the server, creates a request, sends the request, reads the response

Passes `opts` through directly to Rex::Proto::Http::Client#request_cgi.


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# File 'lib/msf/core/exploit/http/client.rb', line 378

def send_request_cgi(opts={}, timeout = 20, disconnect = true)
  send_request_raw(opts.merge(cgi: true), timeout, disconnect)
end

#send_request_cgi!(opts = {}, timeout = 20, redirect_depth = 1) ⇒ Object

Note:

`opts` will be updated to the updated location and `opts` will contain the full URI.

Connects to the server, creates a request, sends the request, reads the response if a redirect (HTTP 30x response) is received it will attempt to follow the direct and retrieve that URI.


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# File 'lib/msf/core/exploit/http/client.rb', line 390

def send_request_cgi!(opts={}, timeout = 20, redirect_depth = 1)
  if datastore['HttpClientTimeout'] && datastore['HttpClientTimeout'] > 0
    actual_timeout = datastore['HttpClientTimeout']
  else
    actual_timeout =  opts[:timeout] || timeout
  end

  res = send_request_cgi(opts, actual_timeout)
  return res unless res && res.redirect? && redirect_depth > 0

  redirect_depth -= 1
  return res if res.redirection.nil?

  reconfig_redirect_opts!(res, opts)
  send_request_cgi!(opts, actual_timeout, redirect_depth)
end

#send_request_raw(opts = {}, timeout = 20, disconnect = false) ⇒ Object

Connects to the server, creates a request, sends the request, reads the response

Passes opts through directly to Rex::Proto::Http::Client#request_raw.


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# File 'lib/msf/core/exploit/http/client.rb', line 317

def send_request_raw(opts={}, timeout = 20, disconnect = false)
  if datastore['HttpClientTimeout'] && datastore['HttpClientTimeout'] > 0
    actual_timeout = datastore['HttpClientTimeout']
  else
    actual_timeout =  opts[:timeout] || timeout
  end

  begin
    c = connect(opts)
    r = opts[:cgi] ? c.request_cgi(opts) : c.request_raw(opts)

    if datastore['HttpTrace']
      request_color, response_color =
        (datastore['HttpTraceColors'] || '').split('/').map { |color| "%bld%#{color}" }

      request = r.to_s(headers_only: datastore['HttpTraceHeaders'])

      print_line('#' * 20)
      print_line('# Request:')
      print_line('#' * 20)
      print_line("%clr#{request_color}#{request}%clr")
    end

    res = c.send_recv(r, actual_timeout)

    if datastore['HttpTrace']
      print_line('#' * 20)
      print_line('# Response:')
      print_line('#' * 20)

      if res
        response = res.to_terminal_output(headers_only: datastore['HttpTraceHeadersOnly'])

        print_line("%clr#{response_color}#{response}%clr")
      else
        print_line('No response received')
      end
    end

    disconnect(c) if disconnect

    res
  rescue ::Errno::EPIPE, ::Timeout::Error => e
    print_line(e.message) if datastore['HttpTrace']
    nil
  rescue Rex::ConnectionError => e
    vprint_error(e.to_s)
    nil
  rescue ::Exception => e
    print_line(e.message) if datastore['HttpTrace']
    raise e
  end
end

#service_detailsObject


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# File 'lib/msf/core/exploit/http/client.rb', line 860

def service_details
  {
    origin_type: :service,
    protocol: 'tcp',
    service_name: (ssl ? 'https' : 'http'),
    address: rhost,
    port: rport
  }
end

#setupObject

For HTTP Client exploits, we often want to verify that the server info matches some regex before firing a giant binary exploit blob at it. We override setup() here to accomplish that.


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# File 'lib/msf/core/exploit/http/client.rb', line 101

def setup
  validate_fingerprint
  super
end

#sslObject

Returns the boolean indicating SSL


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# File 'lib/msf/core/exploit/http/client.rb', line 634

def ssl
  ((datastore.default?('SSL') and [443,3790].include?(rport.to_i)) or datastore['SSL'])
end

#ssl_versionObject

Returns the string indicating SSL version


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# File 'lib/msf/core/exploit/http/client.rb', line 641

def ssl_version
  datastore['SSLVersion']
end

#strip_tags(html) ⇒ Object

removes HTML tags from a provided string. The string is html-unescaped before the tags are removed Leading whitespaces and double linebreaks are removed too


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# File 'lib/msf/core/exploit/http/client.rb', line 599

def strip_tags(html)
  Rex::Text.html_decode(html).gsub(/<\/?[^>]*>/, '').gsub(/^\s+/, '').strip
end

#target_uriObject

Returns the target URI


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# File 'lib/msf/core/exploit/http/client.rb', line 468

def target_uri
  begin
    # In case TARGETURI is empty, at least we default to '/'
    u = datastore['TARGETURI']
    u = "/" if u.nil? or u.empty?
    URI(u)
  rescue ::URI::InvalidURIError
    print_error "Invalid URI: #{datastore['TARGETURI'].inspect}"
    raise Msf::OptionValidateError.new(['TARGETURI'])
  end
end

#validate_fingerprintObject

This method is meant to be overriden in the exploit module to specify a set of regexps to attempt to match against. A failure to match any of them results in a RuntimeError exception being raised.


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# File 'lib/msf/core/exploit/http/client.rb', line 112

def validate_fingerprint()
  # Don't bother checking if there's no database active.
  if (framework.db.active and
      datastore['FingerprintCheck'] and
      self.class.const_defined?('HttpFingerprint'))
    # Get the module-specific config
    opts = self.class.const_get('HttpFingerprint')
    #
    # XXX: Ideally we could have more structured matches, but doing that requires
    # a more structured response cache.
    #
    info = http_fingerprint(opts)
    if info and opts[:pattern]
      opts[:pattern].each do |re|
        if not re.match(info)
          err = "The target server fingerprint \"#{info}\" does not match \"#{re.to_s}\", use 'set FingerprintCheck false' to disable this check."
          fail_with(::Msf::Module::Failure::NotFound, err)
        end
      end
    elsif info.nil?
      err = "The target server did not respond to fingerprinting, use 'set FingerprintCheck false' to disable this check."
      fail_with(::Msf::Module::Failure::Unreachable, err)
    end
  end
end

#vhostObject

Returns the VHOST of the HTTP server.


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# File 'lib/msf/core/exploit/http/client.rb', line 627

def vhost
  datastore['VHOST'] || datastore['RHOST']
end