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autotests: updated hlrauc.py to support re-sync

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If the peer detects a sync error, it sends back AUTS. The
authentication center must then re-synchronize and update
the SQN it has saved for the given ISMI.
This commit is contained in:
James Prestwood 2017-12-13 14:29:14 -08:00 committed by Denis Kenzior
parent 5f3bf1dbac
commit 263074511d
1 changed files with 55 additions and 5 deletions
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60
autotests/util/hlrauc.py
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@ -44,7 +44,7 @@ class AuthCenter:
continue
else:
data = line.split(':')
self._database[data[0]] = ':'.join(data[1:])
self._database[data[0]] = data[1:]
def _process_data(self, data):
if data[:12] == "SIM-REQ-AUTH":
@ -58,7 +58,7 @@ class AuthCenter:
return "ERROR"
response = "SIM-RESP-AUTH %s" % imsi
response += (' ' + data)*int(num_chals)
response += (' ' + ':'.join(data))*int(num_chals)
return response
elif data[:12] == "AKA-REQ-AUTH":
@ -69,16 +69,35 @@ class AuthCenter:
return "ERROR"
# make sure this is an AKA entry
if len(data.split(':')) < 4:
if len(data) < 4:
return "ERROR"
k, opc, amf, sqn = data.split(':')
k, opc, amf, sqn = data
rand = self._bytetostring(os.urandom(16))
response = "AKA-RESP-AUTH %s " % imsi
return response + self._get_milenage(opc, k, rand, sqn, amf)
elif data[:8] == "AKA-AUTS":
# sync error, parse out SQN and reset in database
imsi, auts, rand = data[9:].split(' ')
entry = self._database.get(imsi, None)
if not entry:
return "ERROR"
# make sure this is an AKA entry
if len(entry) < 4:
return "ERROR"
k, opc, amf, sqn = entry
# calculate/set new sequence number
entry[3] = self._resync_autn(opc, k, rand, auts)
self._database[imsi] = entry
return None
def _bytetostring(self, b):
return ''.join(format(x, '02x') for x in b)
@ -89,6 +108,37 @@ class AuthCenter:
ret[i] = a[i] ^ b[i]
return ret
def _resync_autn(self, opc, k, rand, auts):
opc = bytearray.fromhex(opc)
k = bytearray.fromhex(k)
rand = bytearray.fromhex(rand)
auts = bytearray.fromhex(auts)
new_sqn = bytearray(6)
ak_star = bytearray(6)
temp = self._xor(rand, opc)
aes1 = AES.new(bytes(k), AES.MODE_ECB)
temp = aes1.encrypt(bytes(temp))
temp = bytearray(temp)
out5 = bytearray(16)
for i in range(16):
out5[(i + 4) % 16] = temp[i] ^ opc[i];
out5[15] ^= 8
aes2 = AES.new(bytes(k), AES.MODE_ECB)
out5 = aes2.encrypt(bytes(out5))
out5 = bytearray(out5)
for i in range(6):
ak_star[i] = out5[i] ^ opc[i]
for i in range(6):
new_sqn[i] = auts[i] ^ ak_star[i]
return self._bytetostring(new_sqn)
def _get_milenage(self, opc, k, rand, sqn, amf):
'''
Computes milenage values from OPc, K, RAND, SQN and AMF
@ -126,7 +176,7 @@ class AuthCenter:
tmp1 = bytearray(tmp1)
tmp1 = self._xor(tmp1, opc)
maca = self._bytetostring(tmp1)
maca = self._bytetostring(tmp1[0:8])
tmp1 = self._xor(_rand, opc)
aes3 = AES.new(bytes(k), AES.MODE_ECB)