├── .gitignore ├── LICENSE ├── README.md └── src ├── example_client_kex_init_fuzzer.py ├── example_ident_fail.py ├── example_kex_valid.py ├── example_server_kex_init_fuzzer.py └── scapy └── layers └── ssh.py /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | 5 | # C extensions 6 | *.so 7 | 8 | # Distribution / packaging 9 | .Python 10 | env/ 11 | build/ 12 | develop-eggs/ 13 | dist/ 14 | downloads/ 15 | eggs/ 16 | lib/ 17 | lib64/ 18 | parts/ 19 | sdist/ 20 | var/ 21 | *.egg-info/ 22 | .installed.cfg 23 | *.egg 24 | 25 | # PyInstaller 26 | # Usually these files are written by a python script from a template 27 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 28 | *.manifest 29 | *.spec 30 | 31 | # Installer logs 32 | pip-log.txt 33 | pip-delete-this-directory.txt 34 | 35 | # Unit test / coverage reports 36 | htmlcov/ 37 | .tox/ 38 | .coverage 39 | .cache 40 | nosetests.xml 41 | coverage.xml 42 | 43 | # Translations 44 | *.mo 45 | *.pot 46 | 47 | # Django stuff: 48 | *.log 49 | 50 | # Sphinx documentation 51 | docs/_build/ 52 | 53 | # PyBuilder 54 | target/ 55 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | scapy-ssh 2 | ========= 3 | 4 | ssh key exchange layer for scapy 5 | -------------------------------------------------------------------------------- /src/example_client_kex_init_fuzzer.py: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env python 2 | # -*- coding: UTF-8 -*- 3 | # Author : tintinweb@oststrom.com 4 | 5 | 6 | def padding_fix(p): 7 | padd= 8-len(p)%8 8 | if p.haslayer(Raw): 9 | p[Raw].load += 'P'*padd 10 | else: 11 | p=p/('P'*padd) 12 | return p 13 | 14 | if __name__=="__main__": 15 | from scapy.all import * 16 | 17 | # for local testing only ----> 18 | import sys 19 | sys.path.append("scapy/layers") 20 | from ssh import * 21 | # <------ 22 | 23 | import socket 24 | 25 | for i in range(1000): 26 | try: 27 | target = ('192.168.220.131',22) 28 | s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) 29 | s.connect(target) 30 | 31 | p = SSH()/SSHIdent(ident="SSH-2.\r\n") 32 | 33 | 34 | p.show() 35 | 36 | print "sending payload" 37 | s.sendall(str(p)) 38 | resp = s.recv(1024) 39 | print "received, %s"%repr(resp) 40 | 41 | SSH(resp).show() 42 | 43 | 44 | 45 | p=SSHMessage()/fuzz( \ 46 | SSHKexInit(encryption_algorithms_client_to_server=(','+SSH_ALGO_CIPHERS[1])*2, \ 47 | languages_client_to_server="de,uk,de,uk", \ 48 | #languages_client_to_server_length=999,\ 49 | languages_server_to_client="xx", \ 50 | kex_first_packet_follows=2, 51 | reserved=0x0a0b0c0d)/('aa'*2) \ 52 | ) 53 | 54 | #p=SSHMessage()/SSHKexInit(languages_client_to_server='at')/'aaa' 55 | p = padding_fix(p) 56 | 57 | p.show2() 58 | print "sending payload" 59 | s.sendall(str(p)) 60 | resp = s.recv(1024) 61 | print "received, %s"%repr(resp) 62 | 63 | SSH(resp).show() 64 | s.close() 65 | raw_input() 66 | except: pass -------------------------------------------------------------------------------- /src/example_ident_fail.py: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env python 2 | # -*- coding: UTF-8 -*- 3 | # Author : tintinweb@oststrom.com 4 | 5 | 6 | def padding_fix(p): 7 | padd= 8-len(p)%8 8 | if p.haslayer(Raw): 9 | p[Raw].load += 'P'*padd 10 | else: 11 | p=p/('P'*padd) 12 | return p 13 | 14 | if __name__=="__main__": 15 | from scapy.all import * 16 | 17 | # for local testing only ----> 18 | import sys 19 | sys.path.append("scapy/layers") 20 | from ssh import * 21 | # <------ 22 | 23 | import socket 24 | 25 | 26 | target = ('192.168.220.131',22) 27 | s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) 28 | s.connect(target) 29 | 30 | p = SSH()/SSHIdent(ident="SSH-2.0-") # missing \r\n 31 | 32 | 33 | p.show() 34 | 35 | print "sending payload" 36 | s.sendall(str(p)) 37 | 38 | resp = s.recv(1024) 39 | print "received, %s"%repr(resp) 40 | SSH(resp).show() 41 | 42 | s.close() 43 | -------------------------------------------------------------------------------- /src/example_kex_valid.py: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env python 2 | # -*- coding: UTF-8 -*- 3 | # Author : tintinweb@oststrom.com 4 | 5 | 6 | def padding_fix(p): 7 | padd= 8-len(p)%8 8 | if p.haslayer(Raw): 9 | p[Raw].load += 'P'*padd 10 | else: 11 | p=p/('P'*padd) 12 | return p 13 | 14 | if __name__=="__main__": 15 | from scapy.all import * 16 | 17 | # for local testing only ----> 18 | import sys 19 | sys.path.append("scapy/layers") 20 | from ssh import * 21 | # <------ 22 | 23 | import socket 24 | 25 | try: 26 | target = ('192.168.220.131',22) 27 | s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) 28 | s.connect(target) 29 | 30 | p = SSH()/SSHIdent(ident="SSH-2.0-x\r\n") 31 | 32 | 33 | p.show() 34 | 35 | print "sending payload" 36 | s.sendall(str(p)) 37 | 38 | resp = s.recv(1024) 39 | print "received, %s"%repr(resp) 40 | SSH(resp).show() 41 | 42 | 43 | 44 | p=SSHMessage()/SSHKexInit( \ 45 | #encryption_algorithms_client_to_server=SSH_ALGO_CIPHERS[0], \ 46 | #encryption_algorithms_server_to_client=SSH_ALGO_CIPHERS[0], \ 47 | #kex_algorithms=SSH_ALGO_CIPHERS[0], \ 48 | languages_client_to_server="de,uk,de,uk", \ 49 | #languages_client_to_server_length=999,\ 50 | #languages_server_to_client="xx", \ 51 | #kex_first_packet_follows=2, \ 52 | reserved=0) \ 53 | #/('a'*100) 54 | 55 | p = padding_fix(p) 56 | 57 | p.show2() 58 | print "sending payload" 59 | s.sendall(str(p)) 60 | for i in range(3): 61 | resp = s.recv(1024) 62 | print "received, %s"%repr(resp) 63 | 64 | SSH(resp).show() 65 | s.close() 66 | 67 | except: pass -------------------------------------------------------------------------------- /src/example_server_kex_init_fuzzer.py: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env python 2 | # -*- coding: UTF-8 -*- 3 | # Author : tintinweb@oststrom.com 4 | 5 | 6 | def padding_fix(p): 7 | padd= 8-len(p)%8 8 | if p.haslayer(Raw): 9 | p[Raw].load += 'P'*padd 10 | else: 11 | p=p/('P'*padd) 12 | return p 13 | 14 | if __name__=="__main__": 15 | 16 | import sys 17 | sys.path.append("../scapy/layers") 18 | from scapy.all import * 19 | from ssh import * 20 | 21 | import socket 22 | import sys 23 | from thread import * 24 | 25 | 26 | # 27 | HOST = '' # Symbolic name meaning all available interfaces 28 | PORT = 22 # Arbitrary non-privileged port 29 | 30 | s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 31 | print 'Socket created' 32 | 33 | #Bind socket to local host and port 34 | try: 35 | s.bind((HOST, PORT)) 36 | except socket.error as msg: 37 | print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1] 38 | sys.exit() 39 | 40 | print 'Socket bind complete' 41 | 42 | #Start listening on socket 43 | s.listen(10) 44 | print 'Socket now listening' 45 | 46 | #Function for handling connections. This will be used to create threads 47 | def clientthread(conn): 48 | #Sending message to connected client 49 | conn.send('Welcome to the server. Type something and hit enter\n') #send only takes string 50 | 51 | #infinite loop so that function do not terminate and thread do not end. 52 | while True: 53 | 54 | #Receiving from client 55 | data = conn.recv(1024) 56 | reply = 'OK...' + data 57 | if not data: 58 | break 59 | 60 | print reply 61 | 62 | reply = SSH()/SSHIdent(ident="SSH-2.\r\n")/fuzz(Raw()) 63 | conn.sendall(str(reply)) 64 | 65 | reply=SSHMessage()/fuzz( \ 66 | SSHKexInit(encryption_algorithms_client_to_server=(','+SSH_ALGO_CIPHERS[1])*2, \ 67 | languages_client_to_server="de,uk,de,uk", \ 68 | #languages_client_to_server_length=999,\ 69 | languages_server_to_client="xx", \ 70 | kex_first_packet_follows=2, 71 | reserved=0x0a0b0c0d)/('aa'*2) \ 72 | ) 73 | conn.sendall(str(reply)) 74 | 75 | #came out of loop 76 | conn.close() 77 | 78 | #now keep talking with the client 79 | while 1: 80 | #wait to accept a connection - blocking call 81 | conn, addr = s.accept() 82 | print 'Connected with ' + addr[0] + ':' + str(addr[1]) 83 | 84 | #start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function. 85 | start_new_thread(clientthread ,(conn,)) 86 | 87 | s.close() 88 | 89 | exit() -------------------------------------------------------------------------------- /src/scapy/layers/ssh.py: -------------------------------------------------------------------------------- 1 | #! /usr/bin/env python 2 | # -*- coding: UTF-8 -*- 3 | # Author : tintinweb@oststrom.com 4 | # http://www.secdev.org/projects/scapy/doc/build_dissect.html 5 | #https://tools.ietf.org/html/rfc4253 6 | from scapy.packet import Packet, bind_layers 7 | from scapy.fields import * 8 | from scapy.layers.inet import TCP, Raw 9 | import os, time, hashlib 10 | 11 | 12 | class StrCustomTerminatorField(StrField): 13 | def __init__(self, name, default, fmt="H", remain=0,terminator="\x00\x00", consume_terminator=True): 14 | StrField.__init__(self,name,default,fmt,remain) 15 | self.terminator=terminator 16 | self.consume_terminator=consume_terminator 17 | def addfield(self, pkt, s, val): 18 | return s+self.i2m(pkt, val)+self.terminator 19 | def getfield(self, pkt, s): 20 | l = s.find(self.terminator) 21 | if l < 0: 22 | #XXX terminator not found 23 | return "",s 24 | if self.consume_terminator: 25 | return s[l+len(self.terminator):],self.m2i(pkt, s[:l]) 26 | return s[l:],self.m2i(pkt, s[:l]) 27 | def randval(self): 28 | return RandTermString(RandNum(0,1200),self.terminator) 29 | 30 | class HintField(StrField): 31 | def __init__(self, name, default, fmt="H", remain=0): 32 | StrField.__init__(self,name,default,fmt,remain) 33 | def i2len(self, pkt, i): 34 | return 0 35 | def i2m(self, pkt, x): 36 | return '' 37 | class DynamicStrField(Field): 38 | def __init__(self, name, default, fmt="H", remain=0, adjust=lambda pkt,x:x): 39 | Field.__init__(self,name,default,fmt) 40 | self.remain = remain 41 | self.adjust = adjust 42 | def i2len(self, pkt, i): 43 | return len(i) 44 | def i2m(self, pkt, x): 45 | if x is None: 46 | x = "" 47 | elif type(x) is not str: 48 | x=str(x) 49 | 50 | x=self.adjust(pkt,x) 51 | return x 52 | def addfield(self, pkt, s, val): 53 | return s+self.i2m(pkt, val) 54 | def getfield(self, pkt, s): 55 | if self.remain == 0: 56 | return "",self.m2i(pkt, s) 57 | else: 58 | return s[-self.remain:],self.m2i(pkt, s[:-self.remain]) 59 | def randval(self): 60 | return RandBin(RandNum(0,1200)) 61 | 62 | class BLenField(LenField): 63 | def __init__(self, name, default, fmt = "I", adjust=lambda pkt,x:x, numbytes=None, length_of=None, count_of=None): 64 | self.name = name 65 | self.adjust=adjust 66 | self.numbytes=numbytes 67 | self.length_of= length_of 68 | self.count_of = count_of 69 | LenField.__init__(self, name, default, fmt) 70 | 71 | if fmt[0] in "@=<>!": 72 | self.fmt = fmt 73 | else: 74 | self.fmt = "!"+fmt 75 | self.default = self.any2i(None,default) 76 | self.sz = struct.calcsize(self.fmt) if not numbytes else numbytes 77 | self.owners = [] 78 | 79 | def addfield(self, pkt, s, val): 80 | """Add an internal value to a string""" 81 | pack = struct.pack(self.fmt, self.i2m(pkt,val)) 82 | if self.numbytes: 83 | pack=pack[len(pack)-self.numbytes:] 84 | return s+pack 85 | def getfield(self, pkt, s): 86 | """Extract an internal value from a string""" 87 | upack_data = s[:self.sz] 88 | # prepend struct.calcsize()-len(data) bytes to satisfy struct.unpack 89 | upack_data = '\x00'*(struct.calcsize(self.fmt)-self.sz) + upack_data 90 | 91 | return s[self.sz:], self.m2i(pkt, struct.unpack(self.fmt, upack_data)[0]) 92 | 93 | def i2m(self, pkt, x): 94 | if x is None: 95 | if not (self.length_of or self.count_of): 96 | x = len(pkt.payload) 97 | x = self.adjust(pkt,x) 98 | return x 99 | 100 | if self.length_of is not None: 101 | fld,fval = pkt.getfield_and_val(self.length_of) 102 | f = fld.i2len(pkt, fval) 103 | else: 104 | fld,fval = pkt.getfield_and_val(self.count_of) 105 | f = fld.i2count(pkt, fval) 106 | x = self.adjust(pkt,f) 107 | return x 108 | 109 | class XBLenField(BLenField): 110 | def i2repr(self, pkt, x): 111 | return lhex(self.i2h(pkt, x)) 112 | 113 | class XLenField(LenField): 114 | def i2repr(self, pkt, x): 115 | return lhex(self.i2h(pkt, x)) 116 | 117 | class XFieldLenField(FieldLenField): 118 | def i2repr(self, pkt, x): 119 | return lhex(self.i2h(pkt, x)) 120 | 121 | 122 | 123 | SSH_MESSAGE_TYPES = { 0x01:"disconnect", 124 | 0x14:"kex_init", 125 | 0x15:"new_keys", 126 | 0xff:"unknown"} 127 | SSH_TYPE_BOOL = {0x00:True, 128 | 0xff:False} 129 | 130 | SSH_ALGO_CIPHERS = "none,aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour".split(",") 131 | SSH_ALGO_HMACS = "none,hmac-md5-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-ripemd160-etm@openssh.com,hmac-sha1-96-etm@openssh.com,hmac-md5-96-etm@openssh.com,hmac-md5,hmac-sha1,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-sha1-96,hmac-md5-96".split(",") 132 | SSH_ALGO_KEX = "none,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1".split(",") 133 | SSH_ALGO_COMPRESSION = "none,zlib,zlib@openssh.com,none".split(",") 134 | SSH_ALGO_HOSTKEY = "none,ecdsa-sha2-nistp521,ssh-rsa,ssh-dss".split(",") 135 | 136 | 137 | 138 | def ssh_name_list(name, fmt="!I",numbytes=None, default=''): 139 | return [ XBLenField("%s_length"%name,None, length_of="%s"%name, fmt=fmt, numbytes=numbytes), 140 | StrLenField("%s"%name,default,length_from=lambda x:getattr(x,"%s_length"%name)),] 141 | 142 | class SSHIdent(Packet): 143 | name = "SSH Ident" 144 | fields_desc = [ 145 | StrField("ident","SSH-2.0-ScapySSHLayer\r\n"), 146 | ] 147 | 148 | def ssh_calculate_mac(pkt, x): 149 | if len(x): 150 | return x 151 | if not pkt.mac in ('md5','sha-1'): 152 | return x 153 | return getattr(hashlib,pkt.mac)(pkt.data).digest() 154 | 155 | class SSHEncryptedPacket(Packet): 156 | name = "SSH Encrypted Packet" 157 | fields_desc = [ 158 | StrField("data",None), 159 | DynamicStrField("mac",None,adjust=ssh_calculate_mac), 160 | #HintField("encryption",None), 161 | #HintField("mac",'md5'), 162 | #HintField("compression",None), 163 | ] 164 | 165 | 166 | class SSHMessage(Packet): 167 | name = "SSH Message" 168 | fields_desc = [ 169 | XBLenField("length",None, fmt="!I", adjust=lambda pkt,x: x+2 if pkt.lastlayer().haslayer(Raw) else x+2), 170 | XBLenField("padding_length",None, fmt="!B", adjust=lambda pkt,x: len(pkt.lastlayer()) if pkt.lastlayer().haslayer(Raw) else 0), 171 | ByteEnumField("type", 0xff, SSH_MESSAGE_TYPES), 172 | ] 173 | 174 | 175 | class SSHKexInit(Packet): 176 | name = "SSH Key Exchange Init" 177 | fields_desc = [ StrFixedLenField("cookie",os.urandom(16),16),] \ 178 | + ssh_name_list("kex_algorithms",default=",".join(SSH_ALGO_KEX)) \ 179 | + ssh_name_list("server_host_key_algorithms",default=",".join(SSH_ALGO_HOSTKEY)) \ 180 | + ssh_name_list("encryption_algorithms_client_to_server",default=",".join(SSH_ALGO_CIPHERS)) \ 181 | + ssh_name_list("encryption_algorithms_server_to_client",default=",".join(SSH_ALGO_CIPHERS)) \ 182 | + ssh_name_list("mac_algorithms_client_to_server",default=",".join(SSH_ALGO_HMACS)) \ 183 | + ssh_name_list("mac_algorithms_server_to_client",default=",".join(SSH_ALGO_HMACS)) \ 184 | + ssh_name_list("compression_algorithms_client_to_server",default=",".join(SSH_ALGO_COMPRESSION)) \ 185 | + ssh_name_list("compression_algorithms_server_to_client",default=",".join(SSH_ALGO_COMPRESSION)) \ 186 | + ssh_name_list("languages_client_to_server") \ 187 | + ssh_name_list("languages_server_to_client") \ 188 | + [ 189 | ByteEnumField("kex_first_packet_follows", 0x00, SSH_TYPE_BOOL), 190 | IntField("reserved", 0x00), 191 | ] 192 | 193 | SSH_DISCONNECT_REASONS={ 1:'HOST_NOT_ALLOWED_TO_CONNECT', 194 | 2:'PROTOCOL_ERROR', 195 | 3:'KEY_EXCHANGE_FAILED', 196 | 4:'RESERVED', 197 | 5:'MAC_ERROR', 198 | 6:'COMPRESSION_ERROR', 199 | 7:'SERVICE_NOT_AVAILABLE', 200 | 8:'PROTOCOL_VERSION_NOT_SUPPORTED', 201 | 9:'HOST_KEY_NOT_VERIFIABLE', 202 | 10:'CONNECTION_LOST', 203 | 11:'BY_APPLICATION', 204 | 12:'TOO_MANY_CONNECTIONS', 205 | 13:'AUTH_CANCELLED_BY_USER', 206 | 14:'NO_MORE_AUTH_METHODS_AVAILABLE', 207 | 15:'ILLEGAL_USER_NAME', 208 | } 209 | 210 | class SSHDisconnect(Packet): 211 | name = "SSH Disconnect" 212 | fields_desc = [ 213 | IntEnumField("reason", 0xff, SSH_DISCONNECT_REASONS), 214 | StrCustomTerminatorField("description","",terminator="\x00\x00\x00\x00"), 215 | StrCustomTerminatorField("language","",terminator="\x00",consume_terminator=False), 216 | ] 217 | 218 | class SSH(Packet): 219 | name = "SSH" 220 | 221 | 222 | def is_ascii(s): 223 | return all(ord(c) < 128 for c in s) 224 | 225 | def guess_payload_class(self, payload): 226 | 227 | try: 228 | if payload.startswith("SSH-"): 229 | return SSHIdent 230 | 231 | dummy = SSHMessage(payload,_internal=1) 232 | if len(payload)<=dummy.length+4: 233 | return SSHMessage 234 | 235 | except: 236 | pass 237 | return SSHEncryptedPacket 238 | 239 | 240 | 241 | # bind magic 242 | 243 | bind_layers(TCP, SSH, dport=22) 244 | bind_layers(TCP, SSH, sport=22) 245 | 246 | bind_layers(SSH, SSHMessage) 247 | bind_layers(SSHMessage, SSHKexInit, {'type':0x14}) 248 | bind_layers(SSHMessage, SSHDisconnect, {'type':0x01}) 249 | bind_layers(SSH, SSHEncryptedPacket) 250 | --------------------------------------------------------------------------------