Module: Msf::Post::Windows::NetAPI

Defined in:
lib/msf/core/post/windows/net_api.rb

Constant Summary collapse

MAX_PREFERRED_LENGTH = 
-1
SV_TYPE_ALL = 
0xFFFFFFFF
SV_TYPE_DOMAIN_ENUM = 
0x80000000
SV_TYPE_DOMAIN_BAKCTRL = 
0x00000010
SV_TYPE_DOMAIN_CTRL = 
0x00000008
ERROR_ACCESS_DENIED = 
5
ERROR_NOT_ENOUGH_MEMORY = 
8
ERROR_INVALID_PARAMETER = 
87
ERROR_INVALID_LEVEL = 
124
ERROR_MORE_DATA = 
234
ERROR_NO_BROWSER_SERVERS_FOUND = 
6118
NERR_ClientNameNotFound = 
2312
NERR_InvalidComputer = 
2351
NERR_UserNotFound = 
2221

Instance Method Summary collapse

Instance Method Details

#initialize(info = {}) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 25

def initialize(info = {})
  super(
    update_info(
      info,
      'Compat' => {
        'Meterpreter' => {
          'Commands' => %w[
            stdapi_railgun_api
            stdapi_railgun_memread
            stdapi_railgun_memwrite
          ]
        }
      }
    )
  )
end

#net_server_enum(server_type = SV_TYPE_ALL, domain = nil) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 53

def net_server_enum(server_type=SV_TYPE_ALL, domain=nil)
  hosts = []

  result = client.railgun.netapi32.NetServerEnum(
      nil,    # servername
      100,    # level (100/101)
      4,      # bufptr
      MAX_PREFERRED_LENGTH, # prefmaxlen
      4,      # entries read
      4,      # total entries
      server_type, # server_type
      domain,    # domain
      nil     # resume handle
  )

  case result['return']
  when 0
    # Railgun assumes PDWORDS are pointers and returns 8 bytes for x64 architectures.
    # Therefore we need to truncate the result value to an actual
    # DWORD for entriesread or totalentries.
    hosts = read_server_structs(result['bufptr'], (result['entriesread'] % 4294967296), domain, server_type)
  when ERROR_NO_BROWSER_SERVERS_FOUND
    print_error("ERROR_NO_BROWSER_SERVERS_FOUND")
    return nil
  when ERROR_MORE_DATA
    vprint_error("ERROR_MORE_DATA")
    return nil
  end

  netapi_buffer_free(result['bufptr'])

  return hosts
end

#net_session_enum(hostname, username) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 112

def net_session_enum(hostname, username)
  sessions = []

  result = client.railgun.netapi32.NetSessionEnum(
      hostname,   # servername
      nil,        # UncClientName
      username,   # username
      10,         # level
      4,          # bufptr
      MAX_PREFERRED_LENGTH, # prefmaxlen
      4,          # entriesread
      4,          # totalentries
      nil         # resume_handle
  )

  case result['return']
  when 0
    vprint_error("#{hostname} Session identified")
    sessions = read_session_structs(result['bufptr'], (result['entriesread'] % 4294967296), hostname)
  when ERROR_ACCESS_DENIED
    vprint_error("#{hostname} Access denied...")
    return nil
  when 53
    vprint_error("Host not found or did not respond: #{hostname}")
    return nil
  when 123
    vprint_error("Invalid host: #{hostname}")
    return nil
  when NERR_UserNotFound
    return nil
  when ERROR_MORE_DATA
    vprint_error("#{hostname} ERROR_MORE_DATA")
  else
    vprint_error("Unaccounted for error code: #{result['return']}")
    return nil
  end

  netapi_buffer_free(result['bufptr'])

  return sessions
end

#netapi_buffer_free(ptr) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 47

def netapi_buffer_free(ptr)
  # Free the buffer
  ret = client.railgun.netapi32.NetApiBufferFree(ptr)
  vprint_error("Unable to free buffer, Error Code: #{ret['return']}") unless ret['return'] == 0
end

#read_server_structs(start_ptr, count, domain, server_type) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 87

def read_server_structs(start_ptr, count, domain, server_type)
  hosts = []
  return hosts if count <= 0

  ptr_size = client.railgun.util.pointer_size
  ptr = (ptr_size == 8) ? 'Q<' : 'V'

  base = 0
  # Struct -> Ptr, Ptr
  struct_size = ptr_size * 2

  mem = client.railgun.memread(start_ptr, struct_size*count)

  count.times do
    x = {}
    x[:version]= mem[(base + 0),ptr_size].unpack(ptr).first
    nameptr = mem[(base + ptr_size),ptr_size].unpack(ptr).first
    x[:name] = UnicodeByteStringToAscii(client.railgun.memread(nameptr, 255))
    hosts << x
    base += struct_size
  end

  hosts
end

#read_session_structs(start_ptr, count, hostname) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 154

def read_session_structs(start_ptr, count, hostname)
  sessions = []
  return sessions if count <= 0

  ptr_size = client.railgun.util.pointer_size
  ptr = (ptr_size == 8) ? 'Q<' : 'V'

  base = 0
  # Struct -> Ptr, Ptr, Dword Dword
  struct_size = (ptr_size * 2) + 8
  mem = client.railgun.memread(start_ptr, struct_size*count)

  count.times do
    sess = {}
    cnameptr = mem[(base + 0),ptr_size].unpack(ptr).first
    usernameptr = mem[(base + ptr_size),ptr_size].unpack(ptr).first
    sess[:usetime] = mem[(base + (ptr_size * 2)),4].unpack('V').first
    sess[:idletime] = mem[(base + (ptr_size * 2) + 4),4].unpack('V').first
    sess[:cname] = UnicodeByteStringToAscii(client.railgun.memread(cnameptr,255))
    sess[:username] = UnicodeByteStringToAscii(client.railgun.memread(usernameptr,255))
    sess[:hostname] = hostname
    sessions << sess
    base = base + struct_size
  end

  sessions
end

#UnicodeByteStringToAscii(str) ⇒ Object

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# File 'lib/msf/core/post/windows/net_api.rb', line 42

def UnicodeByteStringToAscii(str)
  length = (str.index "\0\0\0") + 1
  Rex::Text.to_ascii(str[0..length])
end