478 lines
11 KiB
Ruby
478 lines
11 KiB
Ruby
##
|
|
# $Id$
|
|
##
|
|
|
|
require 'msf/base'
|
|
require 'msf/base/sessions/scriptable'
|
|
require 'rex/post/meterpreter'
|
|
|
|
module Msf
|
|
module Sessions
|
|
|
|
###
|
|
#
|
|
# This class represents a session compatible interface to a meterpreter server
|
|
# instance running on a remote machine. It provides the means of interacting
|
|
# with the server instance both at an API level as well as at a console level.
|
|
#
|
|
###
|
|
class Meterpreter < Rex::Post::Meterpreter::Client
|
|
|
|
include Msf::Session
|
|
#
|
|
# The meterpreter session is interactive
|
|
#
|
|
include Msf::Session::Interactive
|
|
include Msf::Session::Comm
|
|
|
|
#
|
|
# This interface supports interacting with a single command shell.
|
|
#
|
|
include Msf::Session::Provider::SingleCommandShell
|
|
|
|
include Msf::Session::Scriptable
|
|
|
|
# Override for server implementations that can't do ssl
|
|
def supports_ssl?
|
|
true
|
|
end
|
|
def supports_zlib?
|
|
true
|
|
end
|
|
|
|
#
|
|
# Initializes a meterpreter session instance using the supplied rstream
|
|
# that is to be used as the client's connection to the server.
|
|
#
|
|
def initialize(rstream, opts={})
|
|
super
|
|
|
|
opts[:capabilities] = {
|
|
:ssl => supports_ssl?,
|
|
:zlib => supports_zlib?
|
|
}
|
|
if not opts[:skip_ssl]
|
|
# the caller didn't request to skip ssl, so make sure we support it
|
|
opts.merge!(:skip_ssl => (not supports_ssl?))
|
|
end
|
|
|
|
#
|
|
# Initialize the meterpreter client
|
|
#
|
|
self.init_meterpreter(rstream, opts)
|
|
|
|
#
|
|
# Create the console instance
|
|
#
|
|
self.console = Rex::Post::Meterpreter::Ui::Console.new(self)
|
|
end
|
|
|
|
#
|
|
# Returns the session type as being 'meterpreter'.
|
|
#
|
|
def self.type
|
|
"meterpreter"
|
|
end
|
|
|
|
#
|
|
# Calls the class method
|
|
#
|
|
def type
|
|
self.class.type
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Provider::SingleCommandShell implementors
|
|
#
|
|
# Create a channelized shell process on the target
|
|
#
|
|
def shell_init
|
|
return true if @shell
|
|
|
|
# COMSPEC is special-cased on all meterpreters to return a viable
|
|
# shell.
|
|
sh = fs.file.expand_path("%COMSPEC%")
|
|
@shell = sys.process.execute(sh, nil, { "Hidden" => true, "Channelized" => true })
|
|
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Provider::SingleCommandShell implementors
|
|
#
|
|
# Read from the command shell.
|
|
#
|
|
def shell_read(length=nil, timeout=1)
|
|
shell_init
|
|
|
|
length = nil if length.nil? or length < 0
|
|
begin
|
|
rv = nil
|
|
# Meterpreter doesn't offer a way to timeout on the victim side, so
|
|
# we have to do it here. I'm concerned that this will cause loss
|
|
# of data.
|
|
Timeout.timeout(timeout) {
|
|
rv = @shell.channel.read(length)
|
|
}
|
|
framework.events.on_session_output(self, rv) if rv
|
|
return rv
|
|
rescue ::Timeout::Error
|
|
return nil
|
|
rescue ::Exception => e
|
|
shell_close
|
|
raise e
|
|
end
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Provider::SingleCommandShell implementors
|
|
#
|
|
# Write to the command shell.
|
|
#
|
|
def shell_write(buf)
|
|
shell_init
|
|
|
|
begin
|
|
framework.events.on_session_command(self, buf.strip)
|
|
len = @shell.channel.write("#{buf}\n")
|
|
rescue ::Exception => e
|
|
shell_close
|
|
raise e
|
|
end
|
|
|
|
len
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Provider::SingleCommandShell implementors
|
|
#
|
|
# Terminate the shell channel
|
|
#
|
|
def shell_close
|
|
@shell.close
|
|
@shell = nil
|
|
end
|
|
|
|
def shell_command(cmd)
|
|
# Send the shell channel's stdin.
|
|
shell_write(cmd + "\n")
|
|
|
|
timeout = 5
|
|
etime = ::Time.now.to_f + timeout
|
|
buff = ""
|
|
|
|
# Keep reading data until no more data is available or the timeout is
|
|
# reached.
|
|
while (::Time.now.to_f < etime)
|
|
res = shell_read(-1, timeout)
|
|
break unless res
|
|
timeout = etime - ::Time.now.to_f
|
|
buff << res
|
|
end
|
|
|
|
buff
|
|
end
|
|
|
|
#
|
|
# Called by PacketDispatcher to resolve error codes to names.
|
|
# This is the default version (return the number itself)
|
|
#
|
|
def lookup_error(code)
|
|
"#{code}"
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session overrides
|
|
#
|
|
# Cleans up the meterpreter client session.
|
|
#
|
|
def cleanup
|
|
cleanup_meterpreter
|
|
|
|
super
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session overrides
|
|
#
|
|
# Returns the session description.
|
|
#
|
|
def desc
|
|
"Meterpreter"
|
|
end
|
|
|
|
|
|
##
|
|
# :category: Msf::Session::Scriptable implementors
|
|
#
|
|
# Runs the meterpreter script in the context of a script container
|
|
#
|
|
def execute_file(full_path, args)
|
|
o = Rex::Script::Meterpreter.new(self, full_path)
|
|
o.run(args)
|
|
end
|
|
|
|
|
|
##
|
|
# :category: Msf::Session::Interactive implementors
|
|
#
|
|
# Initializes the console's I/O handles.
|
|
#
|
|
def init_ui(input, output)
|
|
self.user_input = input
|
|
self.user_output = output
|
|
console.init_ui(input, output)
|
|
console.set_log_source(log_source)
|
|
|
|
super
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Interactive implementors
|
|
#
|
|
# Resets the console's I/O handles.
|
|
#
|
|
def reset_ui
|
|
console.unset_log_source
|
|
console.reset_ui
|
|
end
|
|
|
|
#
|
|
# Terminates the session
|
|
#
|
|
def kill
|
|
begin
|
|
cleanup_meterpreter
|
|
self.sock.close
|
|
rescue ::Exception
|
|
end
|
|
framework.sessions.deregister(self)
|
|
end
|
|
|
|
#
|
|
# Run the supplied command as if it came from suer input.
|
|
#
|
|
def queue_cmd(cmd)
|
|
console.queue_cmd(cmd)
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Interactive implementors
|
|
#
|
|
# Explicitly runs a command in the meterpreter console.
|
|
#
|
|
def run_cmd(cmd)
|
|
console.run_single(cmd)
|
|
end
|
|
|
|
#
|
|
# Load the stdapi extension.
|
|
#
|
|
def load_stdapi()
|
|
original = console.disable_output
|
|
console.disable_output = true
|
|
console.run_single('load stdapi')
|
|
console.disable_output = original
|
|
end
|
|
|
|
#
|
|
# Load the priv extension.
|
|
#
|
|
def load_priv()
|
|
original = console.disable_output
|
|
|
|
console.disable_output = true
|
|
console.run_single('load priv')
|
|
console.disable_output = original
|
|
end
|
|
|
|
#
|
|
# Populate the session information.
|
|
#
|
|
# Also reports a session_fingerprint note for host os normalization.
|
|
#
|
|
def load_session_info()
|
|
begin
|
|
::Timeout.timeout(60) do
|
|
# Gather username/system information
|
|
username = self.sys.config.getuid
|
|
sysinfo = self.sys.config.sysinfo
|
|
|
|
safe_info = "#{username} @ #{sysinfo['Computer']}"
|
|
safe_info.force_encoding("ASCII-8BIT") if safe_info.respond_to?(:force_encoding)
|
|
# Should probably be using Rex::Text.ascii_safe_hex but leave
|
|
# this as is for now since "\xNN" is arguably uglier than "_"
|
|
# showing up in various places in the UI.
|
|
safe_info.gsub!(/[\x00-\x08\x0b\x0c\x0e-\x19\x7f-\xff]+/n,"_")
|
|
self.info = safe_info
|
|
|
|
# Enumerate network interfaces to detect IP
|
|
ifaces = self.net.config.get_interfaces().flatten rescue []
|
|
routes = self.net.config.get_routes().flatten rescue []
|
|
shost = self.session_host
|
|
|
|
# Try to match our visible IP to a real interface
|
|
# TODO: Deal with IPv6 addresses
|
|
found = !!(ifaces.find {|i| i.addrs.find {|a| a == shost } })
|
|
nhost = nil
|
|
hobj = nil
|
|
|
|
if Rex::Socket.is_ipv4?(shost) and not found
|
|
|
|
# Try to find an interface with a default route
|
|
default_routes = routes.select{ |r| r.subnet == "0.0.0.0" || r.subnet == "::" }
|
|
default_routes.each do |r|
|
|
ifaces.each do |i|
|
|
bits = Rex::Socket.net2bitmask( i.netmask ) rescue 32
|
|
rang = Rex::Socket::RangeWalker.new( "#{i.ip}/#{bits}" ) rescue nil
|
|
if rang and rang.include?( r.gateway )
|
|
nhost = i.ip
|
|
break
|
|
end
|
|
end
|
|
break if nhost
|
|
end
|
|
|
|
# Find the first non-loopback address
|
|
if not nhost
|
|
iface = ifaces.select{|i| i.ip != "127.0.0.1" and i.ip != "::1" }
|
|
if iface.length > 0
|
|
nhost = iface.first.ip
|
|
end
|
|
end
|
|
end
|
|
|
|
# If we found a better IP address for this session, change it up
|
|
# only handle cases where the DB is not connected here
|
|
if not (framework.db and framework.db.active)
|
|
self.session_host = nhost
|
|
end
|
|
|
|
|
|
# The rest of this requires a database, so bail if it's not
|
|
# there
|
|
return if not (framework.db and framework.db.active)
|
|
|
|
wspace = framework.db.find_workspace(workspace)
|
|
|
|
# Account for finding ourselves on a different host
|
|
if nhost and self.db_record
|
|
# Create or switch to a new host in the database
|
|
hobj = framework.db.report_host(:workspace => wspace, :host => nhost)
|
|
if hobj
|
|
self.session_host = nhost
|
|
self.db_record.host_id = hobj[:id]
|
|
end
|
|
end
|
|
|
|
framework.db.report_note({
|
|
:type => "host.os.session_fingerprint",
|
|
:host => self,
|
|
:workspace => wspace,
|
|
:data => {
|
|
:name => sysinfo["Computer"],
|
|
:os => sysinfo["OS"],
|
|
:arch => sysinfo["Architecture"],
|
|
}
|
|
})
|
|
|
|
if self.db_record
|
|
self.db_record.desc = safe_info
|
|
self.db_record.save!
|
|
end
|
|
|
|
framework.db.update_host_via_sysinfo(:host => self, :workspace => wspace, :info => sysinfo)
|
|
|
|
if nhost
|
|
framework.db.report_note({
|
|
:type => "host.nat.server",
|
|
:host => shost,
|
|
:workspace => wspace,
|
|
:data => { :info => "This device is acting as a NAT gateway for #{nhost}", :client => nhost },
|
|
:update => :unique_data
|
|
})
|
|
framework.db.report_host(:host => shost, :purpose => 'firewall' )
|
|
|
|
framework.db.report_note({
|
|
:type => "host.nat.client",
|
|
:host => nhost,
|
|
:workspace => wspace,
|
|
:data => { :info => "This device is traversing NAT gateway #{shost}", :server => shost },
|
|
:update => :unique_data
|
|
})
|
|
framework.db.report_host(:host => nhost, :purpose => 'client' )
|
|
end
|
|
|
|
end
|
|
rescue ::Interrupt
|
|
dlog("Interrupt while loading sysinfo: #{e.class}: #{e}")
|
|
raise $!
|
|
rescue ::Exception => e
|
|
# Log the error but otherwise ignore it so we don't kill the
|
|
# session if reporting failed for some reason
|
|
elog("Error loading sysinfo: #{e.class}: #{e}")
|
|
dlog("Call stack:\n#{e.backtrace.join("\n")}")
|
|
end
|
|
end
|
|
|
|
##
|
|
# :category: Msf::Session::Interactive implementors
|
|
#
|
|
# Interacts with the meterpreter client at a user interface level.
|
|
#
|
|
def _interact
|
|
framework.events.on_session_interact(self)
|
|
# Call the console interaction subsystem of the meterpreter client and
|
|
# pass it a block that returns whether or not we should still be
|
|
# interacting. This will allow the shell to abort if interaction is
|
|
# canceled.
|
|
console.interact { self.interacting != true }
|
|
|
|
# If the stop flag has been set, then that means the user exited. Raise
|
|
# the EOFError so we can drop this bitch like a bad habit.
|
|
raise EOFError if (console.stopped? == true)
|
|
end
|
|
|
|
|
|
##
|
|
# :category: Msf::Session::Comm implementors
|
|
#
|
|
# Creates a connection based on the supplied parameters and returns it to
|
|
# the caller. The connection is created relative to the remote machine on
|
|
# which the meterpreter server instance is running.
|
|
#
|
|
def create(param)
|
|
sock = nil
|
|
|
|
# Notify handlers before we create the socket
|
|
notify_before_socket_create(self, param)
|
|
|
|
sock = net.socket.create(param)
|
|
|
|
# sf: unsure if we should raise an exception or just return nil. returning nil for now.
|
|
#if( sock == nil )
|
|
# raise Rex::UnsupportedProtocol.new(param.proto), caller
|
|
#end
|
|
|
|
# Notify now that we've created the socket
|
|
notify_socket_created(self, sock, param)
|
|
|
|
# Return the socket to the caller
|
|
sock
|
|
end
|
|
|
|
attr_accessor :platform
|
|
attr_accessor :binary_suffix
|
|
attr_accessor :console # :nodoc:
|
|
attr_accessor :skip_ssl
|
|
attr_accessor :target_id
|
|
|
|
protected
|
|
|
|
attr_accessor :rstream # :nodoc:
|
|
|
|
end
|
|
|
|
end
|
|
end
|
|
|