Module: Msf::Exploit::Remote::HttpServer

Includes:
Auxiliary::Report, TcpServer
Included in:
CmdStager::HTTP, HTML, PHPInclude, Java::HTTP::ClassLoader
Defined in:
lib/msf/core/exploit/http/server.rb

Overview

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

Defined Under Namespace

Modules: HTML, PHPInclude

Instance Attribute Summary

Attributes included from SocketServer

#service

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

Methods included from TcpServer

#on_client_close, #on_client_connect, #ssl, #ssl_cert, #ssl_cipher, #ssl_compression

Methods included from SocketServer

#_determine_server_comm, #exploit, #on_client_data, #primer, #srvhost, #stop_service, #via_string_for_ip

Instance Method Details

#add_resource(opts) ⇒ Object

Adds a URI resource using the supplied hash parameters.

Path     => The path to associate the procedure with.
Proc     => The procedure to call when the URI is requested.
LongCall => Indicates that the request is a long call.

NOTE: Calling #add_resource will change the results of subsequent calls to #get_resource!


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# File 'lib/msf/core/exploit/http/server.rb', line 409

def add_resource(opts)
  @service_path = opts['Path']
  res = service.add_resource(opts['Path'], opts)

  # This has to go *after* the call to service.add_resource in case
  # the service manager doesn't like it for some reason and raises.
  @my_resources.push(opts['Path'])

  res
end

#add_robots_resourceObject


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# File 'lib/msf/core/exploit/http/server.rb', line 192

def add_robots_resource
  proc = Proc.new do |cli, req|
    self.cli = cli
    send_robots(cli, req)
  end

  vprint_status('Adding hardcoded URI /robots.txt')
  begin
    add_resource('Path' => '/robots.txt', 'Proc' => proc)
  rescue RuntimeError => e
    print_warning(e.message)
  end
end

#autofilterObject

By default, all HTTP servers are not subject to automatic exploitation


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# File 'lib/msf/core/exploit/http/server.rb', line 59

def autofilter
  false
end

#check_dependenciesObject

This method gives a derived class the opportunity to ensure that all dependencies are present before initializing the service.

By default, all HTTP server mixins will try to use zlib.


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# File 'lib/msf/core/exploit/http/server.rb', line 103

def check_dependencies
  use_zlib
end

#cleanupObject

Take care of removing any resources that we created


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# File 'lib/msf/core/exploit/http/server.rb', line 230

def cleanup
  # Must dup here because remove_resource modifies @my_resources
  @my_resources.dup.each do |resource|
    remove_resource(resource)
  end

  super
end

#cliObject

Thread-local client accessor


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# File 'lib/msf/core/exploit/http/server.rb', line 66

def cli
  Thread.current[:cli]
end

#cli=(cli) ⇒ Object

Thread-local client accessor


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# File 'lib/msf/core/exploit/http/server.rb', line 73

def cli=(cli)
  Thread.current[:cli] = cli
end

#close_client(cli) ⇒ Object

Closes a client connection.


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# File 'lib/msf/core/exploit/http/server.rb', line 546

def close_client(cli)
  service.close_client(cli)
end

#create_response(code = 200, message = "OK", proto = Rex::Proto::Http::DefaultProtocol) ⇒ Object

Creates an HTTP response packet.


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# File 'lib/msf/core/exploit/http/server.rb', line 553

def create_response(code = 200, message = "OK", proto = Rex::Proto::Http::DefaultProtocol)
  res = Rex::Proto::Http::Response.new(code, message, proto);
  res['Content-Type'] = 'text/html'
  res
end

#fingerprint_user_agent(ua_str) ⇒ Object

Return a Hash containing a best guess at the actual browser and operating system versions, based on the User-Agent header.

Keys in the returned hash are similar to those expected of Report#report_client, and Msf::DBManager#report_host namely:

:ua_name

a brief identifier for the client, e.g. “Firefox”

:ua_ver

the version number of the client, e.g. “3.0.11”

:os_name

something like “Windows XP”, “Windows 7”, or “Linux”

:os_flavor

something like “Enterprise”, “Pro”, or “Home”

:os_lang

something like “English”, “French”, or “en-US”

:arch

one of the ARCH_* constants

Unknown values may be nil.


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# File 'lib/msf/core/exploit/http/server.rb', line 254

def fingerprint_user_agent(ua_str)

  fp = { :ua_string => ua_str }

  # Guess the browser type based on the user agent
  # Check for IE last since its often impersonated
  case (ua_str.downcase)
    # Chrome tries to look like Safari, so check it first
    when /chrome\/(\d+(:?\.\d+)*)/
      # Matches, e.g.:
      # Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3
      fp[:ua_name] = HttpClients::CHROME
      fp[:ua_ver] = $1
    when /version\/(\d+(:?\.\d+)*)\s*safari/
      fp[:ua_name] = HttpClients::SAFARI
      fp[:ua_ver] = $1
    when /firefox\/((:?[0-9]+\.)+[0-9]+)/
      fp[:ua_name] = HttpClients::FF
      fp[:ua_ver] = $1
    when /opera\/(\d+(:?\.\d+)*)/
      fp[:ua_name] = HttpClients::OPERA
      fp[:ua_ver] = $1
    when /mozilla\/[0-9]+\.[0-9] \(compatible; msie ([0-9]+\.[0-9]+)/i, /mozilla\/[0-9]+\.[0-9] \(.+ rv:([0-9]+\.[0-9])\)/i
      fp[:ua_name] = HttpClients::IE
      fp[:ua_ver] = $1
    else
      fp[:ua_name] = HttpClients::UNKNOWN
  end

  # Guess the language
  case (ua_str.downcase)
    when /(en-us|en-gb)/
      fp[:os_lang] = $1
  end

  # Guess the general OS type
  case (ua_str.downcase)
    when /windows|win32/
      fp[:os_name] = OperatingSystems::WINDOWS
      fp[:arch] = ARCH_X86
    when /linux/
      fp[:os_name] = OperatingSystems::LINUX
    when /iphone|ipad/
      fp[:os_name] = OperatingSystems::APPLE_IOS
      fp[:arch] = 'armle'
    when /mac os x/
      fp[:os_name] = OperatingSystems::MAC_OSX
    else
      fp[:os_name] = OperatingSystems::UNKNOWN
  end

  # Determine the specific OS variant

  # Note that we assume windows variants are the
  # client version and mismatch server editions.

  case (ua_str.downcase)
    when /windows 95/
      fp[:os_name] = 'Windows 95'
    when /windows 98/
      fp[:os_name] = 'Windows 98'
    when /windows nt 4/
      fp[:os_name] = 'Windows NT'
    when /windows nt 5.0/
      fp[:os_name] = 'Windows 2000'
    when /windows nt 5.1/
      fp[:os_name] = 'Windows XP'
    when /windows nt 5.2/
      fp[:os_name] = 'Windows 2003'
    when /windows nt 6.0/
      fp[:os_name] = 'Windows Vista'
    when /windows nt 6.1/
      fp[:os_name] = 'Windows 7'
    when /windows nt 6.2/
      fp[:os_name] = 'Windows 8'
    when /windows nt 6.3/
      fp[:os_name] = 'Windows 8.1'
    when /gentoo/
      fp[:os_vendor] = 'Gentoo'
    when /debian/
      fp[:os_vendor] = 'Debian'
    when /ubuntu/
      fp[:os_vendor] = 'Ubuntu'
    when /fedora/
      fp[:os_vendor] = 'Fedora'
    when /red hat|rhel/
      fp[:os_vendor] = 'RHEL'
    when /android/
      fp[:os_name] = OperatingSystems::ANDROID
  end

  # Guess the architecture
  case (ua_str.downcase)
    when /ppc/
      fp[:arch] = ARCH_PPC
    when /x64|x86_64/
      fp[:arch] = ARCH_X64
    when /i.86|wow64/
      # WOW64 means "Windows on Windows64" and is present
      # in the useragent of 32-bit IE running on 64-bit
      # Windows
      fp[:arch] = ARCH_X86
    when /android|iphone|ipod|ipad/
      fp[:arch] = ARCH_ARMLE
    else
      fp[:arch] = ARCH_X86
  end

  fp
end

#get_resourceObject

Returns the last-used resource path


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# File 'lib/msf/core/exploit/http/server.rb', line 423

def get_resource
  # We don't want modules modifying their service_path inadvertently, so
  # give them a dup.  Can be nil during module setup.
  @service_path ? @service_path.dup : nil
end

#get_uri(cli = self.cli) ⇒ Object

Return a full url of the form http://1.1.1.1:8080/resource/

The address portion should be something a client would be able to route, but see #srvhost_addr for caveats.


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# File 'lib/msf/core/exploit/http/server.rb', line 435

def get_uri(cli=self.cli)
  resource = get_resource

  # The resource won't exist until the server is started
  return unless resource

  ssl = !!(datastore["SSL"])
  proto = (ssl ? "https://" : "http://")
  if datastore['URIHOST']
    host = datastore['URIHOST']
  elsif (cli and cli.peerhost)
    host = Rex::Socket.source_address(cli.peerhost)
  else
    host = srvhost_addr
  end

  if Rex::Socket.is_ipv6?(host)
    host = "[#{host}]"
  end

  if datastore['URIPORT'] && datastore['URIPORT'] != 0
    port = ':' + datastore['URIPORT'].to_s
  elsif (ssl and datastore["SRVPORT"] == 443)
    port = ''
  elsif (!ssl and datastore["SRVPORT"] == 80)
    port = ''
  else
    port = ":" + datastore["SRVPORT"].to_s
  end

  uri = proto + host + port + resource

  uri
end

#hardcoded_uripath(uri) ⇒ void

Note:

This MUST be called from SocketServer#primer so that the service has been set

This method returns an undefined value.

Set #on_request_uri to handle the given uri in addition to the one specified by the developer in opts or by the user in URIPATH.

up but we have not yet entered the listen/accept loop.

Parameters:

  • uri (String)

    The resource URI that should be handled by #on_request_uri.


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# File 'lib/msf/core/exploit/http/server.rb', line 215

def hardcoded_uripath(uri)
  proc = Proc.new do |cli, req|
    on_request_uri(cli, req)
  end

  vprint_status("Adding hardcoded uri #{uri}")
  begin
    add_resource({'Path' => uri, 'Proc' => proc})
  rescue RuntimeError => e
    print_error("This module requires a hardcoded uri at #{uri}. Can't run while other modules are using it.")
    raise e
  end
end

#initialize(info = {}) ⇒ Object


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# File 'lib/msf/core/exploit/http/server.rb', line 24

def initialize(info = {})
  super

  register_options(
    [
      OptString.new('URIPATH', [ false,  "The URI to use for this exploit (default is random)"]),
    ], Exploit::Remote::HttpServer
  )

  register_evasion_options(
    [
      OptBool.new('HTTP::no_cache', [false, 'Disallow the browser to cache HTTP content', false]),
      OptBool.new('HTTP::chunked', [false, 'Enable chunking of HTTP responses via "Transfer-Encoding: chunked"', false]),
      OptBool.new('HTTP::header_folding', [false, 'Enable folding of HTTP headers', false]),
      OptBool.new('HTTP::junk_headers', [false, 'Enable insertion of random junk HTTP headers', false]),
      OptEnum.new('HTTP::compression', [false, 'Enable compression of HTTP responses via content encoding', 'none', ['none','gzip','deflate']]),
      OptString.new('HTTP::server_name', [true, 'Configures the Server header of all outgoing replies', 'Apache'])
    ], Exploit::Remote::HttpServer
  )

  register_advanced_options([
    OptAddress.new('URIHOST', [false, 'Host to use in URI (useful for tunnels)']),
    OptPort.new('URIPORT', [false, 'Port to use in URI (useful for tunnels)']),
    OptBool.new('SendRobots', [false, 'Return a robots.txt file if asked for one', false])
  ])

  # Used to keep track of resources added to the service manager by
  # this module. see #add_resource and #cleanup
  @my_resources = []
  @service_path = nil
end

#on_request_uri(cli, request) ⇒ Object

Called when a request is made to a single URI registered during the start_service. Subsequent registrations will not result in a call to on_request_uri.

Modules should override this method.


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# File 'lib/msf/core/exploit/http/server.rb', line 705

def on_request_uri(cli, request)
end

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# File 'lib/msf/core/exploit/http/server.rb', line 77

def print_prefix
  if cli && self.respond_to?(:stance) &&
      !(stance == Msf::Exploit::Stance::Aggressive || stance.include?(Msf::Exploit::Stance::Aggressive))
    super + "#{cli.peerhost.ljust(16)} #{self.shortname} - "
  else
    super
  end
end

#random_uriObject

Generates a random URI for use with making finger printing more challenging.


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# File 'lib/msf/core/exploit/http/server.rb', line 669

def random_uri
  "/" + Rex::Text.rand_text_alphanumeric(rand(10) + 6)
end

#regenerate_payload(cli, arch = nil, platform = nil, target = nil) ⇒ Object

Re-generates the payload, substituting the current RHOST and RPORT with the supplied client host and port.


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# File 'lib/msf/core/exploit/http/server.rb', line 677

def regenerate_payload(cli, arch = nil, platform = nil, target = nil)
  pcode = nil

  # If the payload fails to generate for some reason, send a 403.
  if ((pcode = super(cli, arch, platform, target)) == nil)
    print_error("Failed to generate payload, sending 403.")

    cli.send_response(
      create_response(403, 'Forbidden'))

    return nil
  end
  pcode
end

#remove_resource(name) ⇒ Object

Removes a URI resource.


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# File 'lib/msf/core/exploit/http/server.rb', line 535

def remove_resource(name)
  # Guard against removing resources added by other modules
  if @my_resources.include?(name)
    @my_resources.delete(name)
    service.remove_resource(name) if service
  end
end

#report_user_agent(address, request, client_opts = {}) ⇒ Object

Store the results of server-side User-Agent fingerprinting in the DB.

Returns a Hash containing host and client information.


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# File 'lib/msf/core/exploit/http/server.rb', line 370

def report_user_agent(address, request, client_opts={})
  fp = fingerprint_user_agent(request["User-Agent"])
  host = {
    :address   => address,
    :host      => address,
  }
  host[:os_name]   = fp[:os_name]   if fp[:os_name]
  host[:os_flavor] = fp[:os_flavor] if fp[:os_flavor]
  host[:arch]      = fp[:arch]      if fp[:arch]
  host[:os_lang]   = fp[:os_lang]   if fp[:os_lang]
  report_host(host)
  client = {
    :host      => address,
    :ua_string => request['User-Agent'],
  }
  client[:ua_name] = fp[:ua_name] if fp[:ua_name]
  client[:ua_ver]  = fp[:ua_ver]  if fp[:ua_ver]
  client.merge!(client_opts) if client_opts
  report_client(client)
  report_note(
    :host => address,
    :type => 'http.request',
    :data => "#{address}: #{request.method} #{request.resource} #{client[:os_name]} #{client[:ua_name]} #{client[:ua_ver]}",
    :update => :unique_data
  )
  return host.merge(client)
end

#resource_uriObject

Returns the configured (or random, if not configured) URI path


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# File 'lib/msf/core/exploit/http/server.rb', line 658

def resource_uri
  path = datastore['URIPATH'] || random_uri
  path = '/' + path if path !~ /^\//
  return path
end

#send_local_redirect(cli, location) ⇒ Object

Sends a 302 redirect relative to our base path


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

def send_local_redirect(cli, location)
  send_redirect(cli, get_resource + location)
end

#send_not_found(cli) ⇒ Object

Sends a 404


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# File 'lib/msf/core/exploit/http/server.rb', line 621

def send_not_found(cli)
  resp_404 = create_response(404, 'Not Found')
  resp_404.body = %Q{\
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL was not found on this server.</p>
<hr>
<address>Apache/2.2.9 (Unix) Server at #{datastore['LHOST']} Port #{datastore['SRVPORT']}</address>
</body></html>
}

  cli.send_response(resp_404)
end

#send_redirect(cli, location = '/', body = '', headers = {}) ⇒ Object

Sends a 302 redirect to the client


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

def send_redirect(cli, location='/', body='', headers = {})
  response = create_response(302, 'Moved')
  response['Content-Type'] = 'text/html'
  response['Location'] = location
  response.body = body.to_s.unpack("C*").pack("C*")
  headers.each_pair { |k,v| response[k] = v }

  cli.send_response(response)
end

#send_response(cli, body, headers = {}) ⇒ Object

Transmits a response to the supplied client, default content-type is text/html

Payload evasions are implemented here!


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# File 'lib/msf/core/exploit/http/server.rb', line 564

def send_response(cli, body, headers = {})
  response = create_response
  response['Content-Type'] = 'text/html'
  response.body = body.to_s.unpack("C*").pack("C*")

  if (datastore['HTTP::compression'])
    self.use_zlib # make sure...
    response.compress = datastore['HTTP::compression']
  end

  if datastore['HTTP::chunked']
    response.auto_cl = false
    response.transfer_chunked = true
  end

  if datastore['HTTP::header_folding']
    response.headers.fold = 1
  end

  if datastore['HTTP::junk_headers']
    response.headers.junk_headers = 1
  end

  if datastore['HTTP::no_cache']
    response.headers['Cache-Control'] = 'no-store, no-cache, must-revalidate'
  end

  headers.each_pair { |k,v| response[k] = v }

  cli.send_response(response)
end

#send_robots(cli, request) ⇒ Object

Sends a canned robots.txt file


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

def send_robots(cli, request)
  print_status('Sending robots.txt')
  robots = create_response(200, 'Success')
  robots['Content-Type'] = 'text/plain'

  robots.body = %Q{\
User-agent: *
Disallow: /
}

  cli.send_response(robots)
end

#srvhost_addrString

An address to which the client can route.

If available, return LHOST which should be the right thing since it already has to be an address the client can route to for the payload to work. However, LHOST will only be available if we're using a reverse_* payload, so if we don't have it, try to use the client's peerhost address. Failing that, fall back to the addr with the default gateway. All of this will be for naught in the case of a user behind NAT using a bind payload but there's nothing we can do about it.

NOTE: The address will be incorrect in the following two situations:

  1. LHOST is pointed at a exploit/multi/handler on some other box.

  2. SRVHOST has a value of '0.0.0.0', the user is behind NAT, and we're using a bind payload. In that case, we don't have an LHOST and the source address will be internal.

This can potentially be dealt with in a module by using the Host header from a request if such a header exists.

Returns:

  • (String)

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# File 'lib/msf/core/exploit/http/server.rb', line 491

def srvhost_addr
  if datastore['URIHOST']
    host = datastore['URIHOST']
  elsif (datastore['LHOST'] and (!datastore['LHOST'].strip.empty?))
    host = datastore["LHOST"]
  else
    if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
      if (respond_to?(:sock) and sock and sock.peerhost)
        # Then this is a Passive-Aggressive module. It has a socket
        # connected to the remote server from which we can deduce the
        # appropriate source address.
        host = Rex::Socket.source_address(sock.peerhost)
      else
        # Otherwise, this module is only a server, not a client, *and*
        # the payload does not have an LHOST option. This can happen,
        # for example, with a browser exploit using a download-exec
        # payload. In that case, just use the address of the interface
        # with the default gateway and hope for the best.
        host = Rex::Socket.source_address
      end
    else
      host = datastore['SRVHOST']
    end
  end

  host
end

#srvportObject

Returns the local port that is being listened on.


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

def srvport
  if datastore['URIPORT']
    port = datastore['URIPORT']
  else
    port = datastore['SRVPORT']
  end

  port
end

#start_service(opts = {}) ⇒ Object

:category: Exploit::Remote::TcpServer overrides

This mixin starts the HTTP server listener. This routine takes a few different hash parameters:

ServerHost => Override the server host to listen on (default to SRVHOST).
ServerPort => Override the server port to listen on (default to SRVPORT).
Uri        => The URI to handle and the associated procedure to call.

TODO: This must be able to take an SSL parameter and not rely completely on the datastore. (See dlink_upnp_exec_noauth)


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# File 'lib/msf/core/exploit/http/server.rb', line 120

def start_service(opts = {})

  check_dependencies

  comm = datastore['ListenerComm']
  if (comm.to_s == "local")
    comm = ::Rex::Socket::Comm::Local
  else
    comm = nil
  end

  # Default the server host and port to what is required by the mixin.
  opts = {
    'ServerHost' => datastore['SRVHOST'],
    'ServerPort' => datastore['SRVPORT'],
    'Comm'       => comm
  }.update(opts)

  # Start a new HTTP server service.
  self.service = Rex::ServiceManager.start(
    Rex::Proto::Http::Server,
    opts['ServerPort'].to_i,
    opts['ServerHost'],
    datastore['SSL'], # XXX: Should be in opts, need to test this
    {
      'Msf'        => framework,
      'MsfExploit' => self,
    },
    opts['Comm'],
    datastore['SSLCert'],
    datastore['SSLCompression'],
    datastore['SSLCipher']
  )

  self.service.server_name = datastore['HTTP::server_name']

  # Default the procedure of the URI to on_request_uri if one isn't
  # provided.
  uopts = {
    'Proc' => Proc.new { |cli, req|
        self.cli = cli
        ( self.respond_to?(:filter_request_uri) &&
                    filter_request_uri(cli, req)
                  ) ? nil : on_request_uri(cli, req)
      },
    'Path' => opts['Path'] || resource_uri
  }.update(opts['Uri'] || {})

  proto = (datastore["SSL"] ? "https" : "http")

  # SSLCompression may or may not actually be available. For example, on
  # Ubuntu, it's disabled by default, unless the correct environment
  # variable is set. See https://github.com/rapid7/metasploit-framework/pull/2666
  if proto == "https" and datastore['SSLCompression']
    print_status("Intentionally using insecure SSL compression. Your operating system might not respect this!")
  end


  print_status("Using URL: #{proto}://#{opts['ServerHost']}:#{opts['ServerPort']}#{uopts['Path']}")

  if opts['ServerHost'] == '0.0.0.0'
    print_status("Local IP: #{proto}://#{Rex::Socket.source_address('1.2.3.4')}:#{opts['ServerPort']}#{uopts['Path']}")
  end

  if datastore['SendRobots']
    add_robots_resource
  end

  add_resource(uopts)

end

#use_zlibObject

Ensures that gzip can be used. If not, an exception is generated. The exception is only raised if the DisableGzip advanced option has not been set.


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# File 'lib/msf/core/exploit/http/server.rb', line 91

def use_zlib
  if !Rex::Text.zlib_present? && datastore['HTTP::compression']
    raise RuntimeError, "zlib support was not detected, yet the HTTP::compression option was set.  Don't do that!"
  end
end