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authorChris Luke <chrisy@flirble.org>2017-10-04 13:59:14 -0400
committerFlorin Coras <florin.coras@gmail.com>2017-10-06 23:02:47 +0000
commite9aebf9db548b940c77f7c5826a1260d1931e75d (patch)
tree2173932a2e69d4a4b2819ed1471f52e964a51204 /test/vpp_lo_interface.py
parentf7f809c298104dc3026106fb498f474d5d8720cc (diff)
Coverity fixes for API socket
- Coverity whines about a zero-length field not being initialized. Change the struct setup to an initializer which will implicitly zero all unused fields, and add the coverity notation that should stop it whining. One or both of these should shut it up! - Fix some incorrect use of ntohl that was tainting values; in these cases htonl should have been used, and avoid a double-swap. Change-Id: I00493a77eb23a0b8feb647165ee349e1e9d5cfdb Signed-off-by: Chris Luke <chrisy@flirble.org>
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## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## This program is published under a GPLv2 license

"""
Wireless LAN according to IEEE 802.11.
"""

import re,struct

from scapy.packet import *
from scapy.fields import *
from scapy.plist import PacketList
from scapy.layers.l2 import *


try:
    from Crypto.Cipher import ARC4
except ImportError:
    log_loading.info("Can't import python Crypto lib. Won't be able to decrypt WEP.")


### Fields

class Dot11AddrMACField(MACField):
    def is_applicable(self, pkt):
        return 1
    def addfield(self, pkt, s, val):
        if self.is_applicable(pkt):
            return MACField.addfield(self, pkt, s, val)
        else:
            return s        
    def getfield(self, pkt, s):
        if self.is_applicable(pkt):
            return MACField.getfield(self, pkt, s)
        else:
            return s,None

class Dot11Addr2MACField(Dot11AddrMACField):
    def is_applicable(self, pkt):
        if pkt.type == 1:
            return pkt.subtype in [ 0xb, 0xa, 0xe, 0xf] # RTS, PS-Poll, CF-End, CF-End+CF-Ack
        return 1

class Dot11Addr3MACField(Dot11AddrMACField):
    def is_applicable(self, pkt):
        if pkt.type in [0,2]:
            return 1
        return 0

class Dot11Addr4MACField(Dot11AddrMACField):
    def is_applicable(self, pkt):
        if pkt.type == 2:
            if pkt.FCfield & 0x3 == 0x3: # To-DS and From-DS are set
                return 1
        return 0
    

### Layers


class PrismHeader(Packet):
    """ iwpriv wlan0 monitor 3 """
    name = "Prism header"
    fields_desc = [ LEIntField("msgcode",68),
                    LEIntField("len",144),
                    StrFixedLenField("dev","",16),
                    LEIntField("hosttime_did",0),
                  LEShortField("hosttime_status",0),
                  LEShortField("hosttime_len",0),
                    LEIntField("hosttime",0),
                    LEIntField("mactime_did",0),
                  LEShortField("mactime_status",0),
                  LEShortField("mactime_len",0),
                    LEIntField("mactime",0),
                    LEIntField("channel_did",0),
                  LEShortField("channel_status",0),
                  LEShortField("channel_len",0),
                    LEIntField("channel",0),
                    LEIntField("rssi_did",0),
                  LEShortField("rssi_status",0),
                  LEShortField("rssi_len",0),
                    LEIntField("rssi",0),
                    LEIntField("sq_did",0),
                  LEShortField("sq_status",0),
                  LEShortField("sq_len",0),
                    LEIntField("sq",0),
                    LEIntField("signal_did",0),
                  LEShortField("signal_status",0),
                  LEShortField("signal_len",0),
              LESignedIntField("signal",0),
                    LEIntField("noise_did",0),
                  LEShortField("noise_status",0),
                  LEShortField("noise_len",0),
                    LEIntField("noise",0),
                    LEIntField("rate_did",0),
                  LEShortField("rate_status",0),
                  LEShortField("rate_len",0),
                    LEIntField("rate",0),
                    LEIntField("istx_did",0),
                  LEShortField("istx_status",0),
                  LEShortField("istx_len",0),
                    LEIntField("istx",0),
                    LEIntField("frmlen_did",0),
                  LEShortField("frmlen_status",0),
                  LEShortField("frmlen_len",0),
                    LEIntField("frmlen",0),
                    ]
    def answers(self, other):
        if isinstance(other, PrismHeader):
            return self.payload.answers(other.payload)
        else:
            return self.payload.answers(other)

class RadioTap(Packet):
    name = "RadioTap dummy"
    fields_desc = [ ByteField('version', 0),
                    ByteField('pad', 0),
                    FieldLenField('len', None, 'notdecoded', '<H', adjust=lambda pkt,x:x+8),
                    FlagsField('present', None, -32, ['TSFT','Flags','Rate','Channel','FHSS','dBm_AntSignal',
                                                     'dBm_AntNoise','Lock_Quality','TX_Attenuation','dB_TX_Attenuation',
                                                      'dBm_TX_Power', 'Antenna', 'dB_AntSignal', 'dB_AntNoise',
                                                     'b14', 'b15','b16','b17','b18','b19','b20','b21','b22','b23',
                                                     'b24','b25','b26','b27','b28','b29','b30','Ext']),
                    StrLenField('notdecoded', "", length_from= lambda pkt:pkt.len-8) ]

class PPI(Packet):
    name = "Per-Packet Information header (partial)"
    fields_desc = [ ByteField("version", 0),
                    ByteField("flags", 0),
                    FieldLenField("len", None, fmt="<H", length_of="fields", adjust=lambda pkt,x:x+8),
                    LEIntField("dlt", 0),
                    StrLenField("notdecoded", "", length_from = lambda pkt:pkt.len-8)
                    ]



class Dot11SCField(LEShortField):
    def is_applicable(self, pkt):
        return pkt.type != 1 # control frame
    def addfield(self, pkt, s, val):
        if self.is_applicable(pkt):
            return LEShortField.addfield(self, pkt, s, val)
        else:
            return s
    def getfield(self, pkt, s):
        if self.is_applicable(pkt):
            return LEShortField.getfield(self, pkt, s)
        else:
            return s,None

class Dot11(Packet):
    name = "802.11"
    fields_desc = [
                    BitField("subtype", 0, 4),
                    BitEnumField("type", 0, 2, ["Management", "Control", "Data", "Reserved"]),
                    BitField("proto", 0, 2),
                    FlagsField("FCfield", 0, 8, ["to-DS", "from-DS", "MF", "retry", "pw-mgt", "MD", "wep", "order"]),
                    ShortField("ID",0),
                    MACField("addr1", ETHER_ANY),
                    Dot11Addr2MACField("addr2", ETHER_ANY),
                    Dot11Addr3MACField("addr3", ETHER_ANY),
                    Dot11SCField("SC", 0),
                    Dot11Addr4MACField("addr4", ETHER_ANY) 
                    ]
    def mysummary(self):
        return self.sprintf("802.11 %Dot11.type% %Dot11.subtype% %Dot11.addr2% > %Dot11.addr1%")
    def guess_payload_class(self, payload):
        if self.type == 0x02 and (self.subtype >= 0x08 and self.subtype <=0xF and self.subtype != 0xD):
            return Dot11QoS
	elif self.FCfield & 0x40:
            return Dot11WEP
        else:
            return Packet.guess_payload_class(self, payload)
    def answers(self, other):
        if isinstance(other,Dot11):
            if self.type == 0: # management
                if self.addr1.lower() != other.addr2.lower(): # check resp DA w/ req SA
                    return 0
                if (other.subtype,self.subtype) in [(0,1),(2,3),(4,5)]:
                    return 1
                if self.subtype == other.subtype == 11: # auth
                    return self.payload.answers(other.payload)
            elif self.type == 1: # control
                return 0
            elif self.type == 2: # data
                return self.payload.answers(other.payload)
            elif self.type == 3: # reserved
                return 0
        return 0
    def unwep(self, key=None, warn=1):
        if self.FCfield & 0x40 == 0:
            if warn:
                warning("No WEP to remove")
            return
        if  isinstance(self.payload.payload, NoPayload):
            if key or conf.wepkey:
                self.payload.decrypt(key)
            if isinstance(self.payload.payload, NoPayload):
                if warn:
                    warning("Dot11 can't be decrypted. Check conf.wepkey.")
                return
        self.FCfield &= ~0x40
        self.payload=self.payload.payload


class Dot11QoS(Packet):
    name = "802.11 QoS"
    fields_desc = [ BitField("TID",None,4),
                    BitField("EOSP",None,1),
                    BitField("Ack Policy",None,2),
                    BitField("Reserved",None,1),
                    ByteField("TXOP",None) ]
    def guess_payload_class(self, payload):
        if isinstance(self.underlayer, Dot11):
            if self.underlayer.FCfield & 0x40:
                return Dot11WEP
        return Packet.guess_payload_class(self, payload)


capability_list = [ "res8", "res9", "short-slot", "res11",
                    "res12", "DSSS-OFDM", "res14", "res15",
                   "ESS", "IBSS", "CFP", "CFP-req",
                   "privacy", "short-preamble", "PBCC", "agility"]

reason_code = {0:"reserved",1:"unspec", 2:"auth-expired",
               3:"deauth-ST-leaving",
               4:"inactivity", 5:"AP-full", 6:"class2-from-nonauth",
               7:"class3-from-nonass", 8:"disas-ST-leaving",
               9:"ST-not-auth"}

status_code = {0:"success", 1:"failure", 10:"cannot-support-all-cap",
               11:"inexist-asso", 12:"asso-denied", 13:"algo-unsupported",
               14:"bad-seq-num", 15:"challenge-failure",
               16:"timeout", 17:"AP-full",18:"rate-unsupported" }

class Dot11Beacon(Packet):
    name = "802.11 Beacon"
    fields_desc = [ LELongField("timestamp", 0),
                    LEShortField("beacon_interval", 0x0064),
                    FlagsField("cap", 0, 16, capability_list) ]
    

class Dot11Elt(Packet):
    name = "802.11 Information Element"
    fields_desc = [ ByteEnumField("ID", 0, {0:"SSID", 1:"Rates", 2: "FHset", 3:"DSset", 4:"CFset", 5:"TIM", 6:"IBSSset", 16:"challenge",
                                            42:"ERPinfo", 46:"QoS Capability", 47:"ERPinfo", 48:"RSNinfo", 50:"ESRates",221:"vendor",68:"reserved"}),
                    FieldLenField("len", None, "info", "B"),
                    StrLenField("info", "", length_from=lambda x:x.len) ]
    def mysummary(self):
        if self.ID == 0:
            return "SSID=%s"%repr(self.info),[Dot11]
        else:
            return ""

class Dot11ATIM(Packet):
    name = "802.11 ATIM"

class Dot11Disas(Packet):
    name = "802.11 Disassociation"
    fields_desc = [ LEShortEnumField("reason", 1, reason_code) ]

class Dot11AssoReq(Packet):
    name = "802.11 Association Request"
    fields_desc = [ FlagsField("cap", 0, 16, capability_list),
                    LEShortField("listen_interval", 0x00c8) ]


class Dot11AssoResp(Packet):
    name = "802.11 Association Response"
    fields_desc = [ FlagsField("cap", 0, 16, capability_list),
                    LEShortField("status", 0),
                    LEShortField("AID", 0) ]

class Dot11ReassoReq(Packet):
    name = "802.11 Reassociation Request"
    fields_desc = [ FlagsField("cap", 0, 16, capability_list),
                    LEShortField("listen_interval", 0x00c8),
                    MACField("current_AP", ETHER_ANY) ]


class Dot11ReassoResp(Dot11AssoResp):
    name = "802.11 Reassociation Response"

class Dot11ProbeReq(Packet):
    name = "802.11 Probe Request"
    
class Dot11ProbeResp(Packet):
    name = "802.11 Probe Response"
    fields_desc = [ LELongField("timestamp", 0),
                    LEShortField("beacon_interval", 0x0064),
                    FlagsField("cap", 0, 16, capability_list) ]
    
class Dot11Auth(Packet):
    name = "802.11 Authentication"
    fields_desc = [ LEShortEnumField("algo", 0, ["open", "sharedkey"]),
                    LEShortField("seqnum", 0),
                    LEShortEnumField("status", 0, status_code) ]
    def answers(self, other):
        if self.seqnum == other.seqnum+1:
            return 1
        return 0

class Dot11Deauth(Packet):
    name = "802.11 Deauthentication"
    fields_desc = [ LEShortEnumField("reason", 1, reason_code) ]



class Dot11WEP(Packet):
    name = "802.11 WEP packet"
    fields_desc = [ StrFixedLenField("iv", "\0\0\0", 3),
                    ByteField("keyid", 0),
                    StrField("wepdata",None,remain=4),
                    IntField("icv",None) ]

    def post_dissect(self, s):
#        self.icv, = struct.unpack("!I",self.wepdata[-4:])
#        self.wepdata = self.wepdata[:-4]
        self.decrypt()

    def build_payload(self):
        if self.wepdata is None:
            return Packet.build_payload(self)
        return ""

    def post_build(self, p, pay):
        if self.wepdata is None:
            key = conf.wepkey
            if key:
                if self.icv is None:
                    pay += struct.pack("<I",crc32(pay))
                    icv = ""
                else:
                    icv = p[4:8]
                c = ARC4.new(self.iv+key)
                p = p[:4]+c.encrypt(pay)+icv
            else:
                warning("No WEP key set (conf.wepkey).. strange results expected..")
        return p
            

    def decrypt(self,key=None):
        if key is None:
            key = conf.wepkey
        if key:
            c = ARC4.new(self.iv+key)
            self.add_payload(LLC(c.decrypt(self.wepdata)))
                    

bind_layers( PrismHeader,   Dot11,         )
bind_layers( RadioTap,      Dot11,         )
bind_layers( PPI,           Dot11,         dlt=105)
bind_layers( Dot11,         LLC,           type=2)
bind_layers( Dot11QoS,      LLC,           )
bind_layers( Dot11,         Dot11AssoReq,    subtype=0, type=0)
bind_layers( Dot11,         Dot11AssoResp,   subtype=1, type=0)
bind_layers( Dot11,         Dot11ReassoReq,  subtype=2, type=0)
bind_layers( Dot11,         Dot11ReassoResp, subtype=3, type=0)
bind_layers( Dot11,         Dot11ProbeReq,   subtype=4, type=0)
bind_layers( Dot11,         Dot11ProbeResp,  subtype=5, type=0)
bind_layers( Dot11,         Dot11Beacon,     subtype=8, type=0)
bind_layers( Dot11,         Dot11ATIM,       subtype=9, type=0)
bind_layers( Dot11,         Dot11Disas,      subtype=10, type=0)
bind_layers( Dot11,         Dot11Auth,       subtype=11, type=0)
bind_layers( Dot11,         Dot11Deauth,     subtype=12, type=0)
bind_layers( Dot11Beacon,     Dot11Elt,    )
bind_layers( Dot11AssoReq,    Dot11Elt,    )
bind_layers( Dot11AssoResp,   Dot11Elt,    )
bind_layers( Dot11ReassoReq,  Dot11Elt,    )
bind_layers( Dot11ReassoResp, Dot11Elt,    )
bind_layers( Dot11ProbeReq,   Dot11Elt,    )
bind_layers( Dot11ProbeResp,  Dot11Elt,    )
bind_layers( Dot11Auth,       Dot11Elt,    )
bind_layers( Dot11Elt,        Dot11Elt,    )


conf.l2types.register(105, Dot11)
conf.l2types.register_num2layer(801, Dot11)
conf.l2types.register(119, PrismHeader)
conf.l2types.register_num2layer(802, PrismHeader)
conf.l2types.register(127, RadioTap)
conf.l2types.register(0xc0, PPI)
conf.l2types.register_num2layer(803, RadioTap)


class WiFi_am(AnsweringMachine):
    """Before using this, initialize "iffrom" and "ifto" interfaces:
iwconfig iffrom mode monitor
iwpriv orig_ifto hostapd 1
ifconfig ifto up
note: if ifto=wlan0ap then orig_ifto=wlan0
note: ifto and iffrom must be set on the same channel
ex:
ifconfig eth1 up
iwconfig eth1 mode monitor
iwconfig eth1 channel 11
iwpriv wlan0 hostapd 1
ifconfig wlan0ap up
iwconfig wlan0 channel 11
iwconfig wlan0 essid dontexist
iwconfig wlan0 mode managed
"""
    function_name = "airpwn"
    filter = None
    
    def parse_options(self, iffrom, ifto, replace, pattern="", ignorepattern=""):
        self.iffrom = iffrom
        self.ifto = ifto
        ptrn = re.compile(pattern)
        iptrn = re.compile(ignorepattern)
        
    def is_request(self, pkt):
        if not isinstance(pkt,Dot11):
            return 0
        if not pkt.FCfield & 1:
            return 0
        if not pkt.haslayer(TCP):
            return 0
        ip = pkt.getlayer(IP)
        tcp = pkt.getlayer(TCP)
        pay = str(tcp.payload)
        if not self.ptrn.match(pay):
            return 0
        if self.iptrn.match(pay):
            return 0

    def make_reply(self, p):
        ip = p.getlayer(IP)
        tcp = p.getlayer(TCP)
        pay = str(tcp.payload)
        del(p.payload.payload.payload)
        p.FCfield="from-DS"
        p.addr1,p.addr2 = p.addr2,p.addr1
        p /= IP(src=ip.dst,dst=ip.src)
        p /= TCP(sport=tcp.dport, dport=tcp.sport,
                 seq=tcp.ack, ack=tcp.seq+len(pay),
                 flags="PA")
        q = p.copy()
        p /= self.replace
        q.ID += 1
        q.getlayer(TCP).flags="RA"
        q.getlayer(TCP).seq+=len(replace)
        return [p,q]
    
    def print_reply(self):
        print p.sprintf("Sent %IP.src%:%IP.sport% > %IP.dst%:%TCP.dport%")

    def send_reply(self, reply):
        sendp(reply, iface=self.ifto, **self.optsend)

    def sniff(self):
        sniff(iface=self.iffrom, **self.optsniff)



plst=[]
def get_toDS():
    global plst
    while 1:
        p,=sniff(iface="eth1",count=1)
        if not isinstance(p,Dot11):
            continue
        if p.FCfield & 1:
            plst.append(p)
            print "."


#    if not ifto.endswith("ap"):
#        print "iwpriv %s hostapd 1" % ifto
#        os.system("iwpriv %s hostapd 1" % ifto)
#        ifto += "ap"
#        
#    os.system("iwconfig %s mode monitor" % iffrom)
#    

def airpwn(iffrom, ifto, replace, pattern="", ignorepattern=""):
    """Before using this, initialize "iffrom" and "ifto" interfaces:
iwconfig iffrom mode monitor
iwpriv orig_ifto hostapd 1
ifconfig ifto up
note: if ifto=wlan0ap then orig_ifto=wlan0
note: ifto and iffrom must be set on the same channel
ex:
ifconfig eth1 up
iwconfig eth1 mode monitor
iwconfig eth1 channel 11
iwpriv wlan0 hostapd 1
ifconfig wlan0ap up
iwconfig wlan0 channel 11
iwconfig wlan0 essid dontexist
iwconfig wlan0 mode managed
"""
    
    ptrn = re.compile(pattern)
    iptrn = re.compile(ignorepattern)
    def do_airpwn(p, ifto=ifto, replace=replace, ptrn=ptrn, iptrn=iptrn):
        if not isinstance(p,Dot11):
            return
        if not p.FCfield & 1:
            return
        if not p.haslayer(TCP):
            return
        ip = p.getlayer(IP)
        tcp = p.getlayer(TCP)
        pay = str(tcp.payload)
#        print "got tcp"
        if not ptrn.match(pay):
            return
#        print "match 1"
        if iptrn.match(pay):
            return
#        print "match 2"
        del(p.payload.payload.payload)
        p.FCfield="from-DS"
        p.addr1,p.addr2 = p.addr2,p.addr1
        q = p.copy()
        p /= IP(src=ip.dst,dst=ip.src)
        p /= TCP(sport=tcp.dport, dport=tcp.sport,
                 seq=tcp.ack, ack=tcp.seq+len(pay),
                 flags="PA")
        q = p.copy()
        p /= replace
        q.ID += 1
        q.getlayer(TCP).flags="RA"
        q.getlayer(TCP).seq+=len(replace)
        
        sendp([p,q], iface=ifto, verbose=0)
#        print "send",repr(p)        
#        print "send",repr(q)
        print p.sprintf("Sent %IP.src%:%IP.sport% > %IP.dst%:%TCP.dport%")

    sniff(iface=iffrom,prn=do_airpwn)

            
        
conf.stats_dot11_protocols += [Dot11WEP, Dot11Beacon, ]


        


class Dot11PacketList(PacketList):
    def __init__(self, res=None, name="Dot11List", stats=None):
        if stats is None:
            stats = conf.stats_dot11_protocols

        PacketList.__init__(self, res, name, stats)
    def toEthernet(self):
        data = map(lambda x:x.getlayer(Dot11), filter(lambda x : x.haslayer(Dot11) and x.type == 2, self.res))
        r2 = []
        for p in data:
            q = p.copy()
            q.unwep()
            r2.append(Ether()/q.payload.payload.payload) #Dot11/LLC/SNAP/IP
        return PacketList(r2,name="Ether from %s"%self.listname)