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

Includes:
Auxiliary::Report, TcpServer
Included in:
HTML, PHPInclude
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 Method Summary collapse

Methods included from Auxiliary::Report

#db, #get_client, #get_host, #inside_workspace_boundary?, #mytask, #myworkspace, #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 TcpServer

#exploit, #on_client_close, #on_client_connect, #on_client_data, #primer, #srvhost, #srvport, #ssl, #ssl_cert, #ssl_compression, #stop_service

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 410

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

#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 49

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 138

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 244

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 56

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 63

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 523

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 530

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

one of the Msf::OperatingSystems constants

:os_flavor

something like “XP” or “Gentoo”

: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 268

def fingerprint_user_agent(ua_str)
  fp = { :ua_string => ua_str }

  # always check for IE last because everybody tries to
  # look like IE
  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]+)/
      fp[:ua_name] = HttpClients::IE
      fp[:ua_ver] = $1
    else
      fp[:ua_name] = HttpClients::UNKNOWN
  end
  case (ua_str.downcase)
    when /(en-us|en-gb)/
      fp[:os_lang] = $1
  end
  case (ua_str.downcase)
    when /windows/
      fp[:os_name] = OperatingSystems::WINDOWS
      fp[:arch] = ARCH_X86
    when /linux/
      fp[:os_name] = OperatingSystems::LINUX
    when /iphone/
      fp[:os_name] = OperatingSystems::MAC_OSX
      fp[:arch] = 'armle'
    when /mac os x/
      fp[:os_name] = OperatingSystems::MAC_OSX
    else
      fp[:os_name] = OperatingSystems::UNKNOWN
  end
  case (ua_str.downcase)
    when /windows 95/
      fp[:os_flavor] = '95'
    when /windows 98/
      fp[:os_flavor] = '98'
    when /windows nt 4/
      fp[:os_flavor] = 'NT'
    when /windows nt 5.0/
      fp[:os_flavor] = '2000'
    when /windows nt 5.1/
      fp[:os_flavor] = 'XP'
    when /windows nt 5.2/
      fp[:os_flavor] = '2003'
    when /windows nt 6.0/
      fp[:os_flavor] = 'Vista'
    when /windows nt 6.1/
      fp[:os_flavor] = '7'
    when /windows nt 6.2/
      fp[:os_flavor] = '8'
    when /gentoo/
      fp[:os_flavor] = 'Gentoo'
    when /debian/
      fp[:os_flavor] = 'Debian'
    when /ubuntu/
      fp[:os_flavor] = 'Ubuntu'
    when /fedora/
      fp[:os_flavor] = 'Fedora'
    when /red hat|rhel/
      fp[:os_flavor] = 'RHEL'
    when /android/
      fp[:os_flavor] = 'Android'
    else
      fp[:os_flavor] = ''
  end
  case (ua_str.downcase)
    when /ppc/
      fp[:arch] = ARCH_PPC
    when /x64|x86_64/
      fp[:arch] = ARCH_X86_64
    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 424

def get_resource
  # We don't want modules modifying their service_path inadvertantly, 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 436

def get_uri(cli=self.cli)
  ssl = !!(datastore["SSL"])
  proto = (ssl ? "https://" : "http://")
  if (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 (ssl and datastore["SRVPORT"] == 443)
    port = ''
  elsif (!ssl and datastore["SRVPORT"] == 80)
    port = ''
  else
    port = ":" + datastore["SRVPORT"].to_s
  end

  uri = proto + host + port + get_resource

  uri
end

#hardcoded_uripath(uri) ⇒ void

Note:

This MUST be called from TcpServer#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 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 229

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 21

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::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
  )

  # 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 662

def on_request_uri(cli, request)
end

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 84

def print_debug(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 79

def print_error(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 69

def print_line(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 74

def print_status(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 90

def print_warning(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
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 626

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 634

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 512

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)
  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 371

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 615

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 586

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 594

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 572

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 541

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'] == true)
    response.auto_cl = false
    response.transfer_chunked = true
  end

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

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

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

  cli.send_response(response)
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 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 483

def srvhost_addr
  if (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

#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 155

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']
  )

  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' => 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

  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 126

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

#vprint_debug(msg = '') ⇒ Object

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 111

def vprint_debug(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

#vprint_error(msg = '') ⇒ Object

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 106

def vprint_error(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

#vprint_line(msg = '') ⇒ Object

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 96

def vprint_line(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

#vprint_status(msg = '') ⇒ Object

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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

def vprint_status(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end

#vprint_warning(msg = '') ⇒ Object

:category: print_* overrides Prepends client and module name if inside a thread with a #cli


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# File 'lib/msf/core/exploit/http/server.rb', line 116

def vprint_warning(msg='')
  (cli) ? super("#{cli.peerhost.ljust(16)} #{self.shortname} - #{msg}") : super
end