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Add initial code for Diffie-Hellman key exchange.

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This commit is contained in:
Andris Raugulis 2016-04-01 18:37:20 +03:00
parent 926b78889e
commit 5af8859d6b
1 changed files with 43 additions and 2 deletions
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45
ssh-audit.py
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@ -24,7 +24,7 @@
THE SOFTWARE. THE SOFTWARE.
""" """
from __future__ import print_function from __future__ import print_function
import os, io, sys, socket, struct import os, io, sys, socket, struct, random
SSH_BANNER = 'SSH-2.0-OpenSSH_7.2' SSH_BANNER = 'SSH-2.0-OpenSSH_7.2'
@ -226,7 +226,7 @@ class SSH(object):
if padding < 4: if padding < 4:
padding += 8 padding += 8
plen = len(payload) + padding + 1 plen = len(payload) + padding + 1
pad_bytes = '\x00' * padding pad_bytes = b'\x00' * padding
data = struct.pack('>Ib', plen, padding) + payload + pad_bytes data = struct.pack('>Ib', plen, padding) + payload + pad_bytes
self.send(data) self.send(data)
@ -243,6 +243,47 @@ class SSH(object):
except: except:
pass pass
class KexDH(object):
def __init__(self, alg, g, p):
self.__alg = alg
self.__g = g
self.__p = p
self.__q = (self.__p - 1) // 2
self.__x = None
def send_init(self, s):
r = random.SystemRandom()
self.__x = r.randrange(2, self.__q)
self.__e = pow(self.__g, self.__x, self.__p)
s.write_byte(SSH.MSG_KEXDH_INIT)
s.write_mpint(self.__e)
s.send_packet()
class KexGroup1(KexDH):
def __init__(self):
# rfc2409: second oakley group
p = int('ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67'
'cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6d'
'f25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff'
'5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece65381'
'ffffffffffffffff', 16)
super(KexGroup1, self).__init__('sha1', 2, p)
class KexGroup14(KexDH):
def __init__(self):
# rfc3526: 2048-bit modp group
p = int('ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67'
'cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6d'
'f25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff'
'5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece45b3d'
'c2007cb8a163bf0598da48361c55d39a69163fa8fd24cf5f83655d23dca3'
'ad961c62f356208552bb9ed529077096966d670c354e4abc9804f1746c08'
'ca18217c32905e462e36ce3be39e772c180e86039b2783a2ec07a28fb5c5'
'5df06f4c52c9de2bcbf6955817183995497cea956ae515d2261898fa0510'
'15728e5a8aacaa68ffffffffffffffff', 16)
super(KexGroup14, self).__init__('sha1', 2, p)
def get_ssh_ver(versions): def get_ssh_ver(versions):
tv = [] tv = []
for v in versions.split(','): for v in versions.split(','):