9 Mar
2013
9 Mar
'13
10:45 p.m.
Good Afternoon,
I am trying to perform USIM/3G authentication using osmo-sim-auth and ran
into the same problem as Stefanos:
http://lists.osmocom.org/pipermail/simtrace/2012-November/000406.html
I followed Benoit's advice to view the details as follows (using the inputs
from the web page):
rand_bin =
stringToByte(a2b_hex('00000000000000000000000000000000'))
autn_bin = stringToByte(a2b_hex('ec9320c2c2000000e1dd22c1ad3e2d3d'))
u.authenticate(RAND=rand_bin, AUTN=autn_bin,ctx='3G')
u.coms()
['INTERNAL AUTHENTICATE apdu: 00 88 00 81 22 10 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 10 EC 93 20 C2 C2 00 00 00 E1 DD 22 C1 AD
3E 2D 3D',
'sw1, sw2: 98 62 - undefined status',
(152, 98),
[]]
11 Mar
11 Mar
6:25 p.m.
Hello,
to perform a 3G authentication with a USIM, you need to know the
authentication key K and counter SQN within the USIM.
RAND / AUTN generation is explained in TS 33.102, section 6.3.
2013/3/9 Rupert Lloyd <rupert.lloyd(a)gmail.com>om>:
Good Afternoon,
I am trying to perform USIM/3G authentication using osmo-sim-auth and ran
into the same problem as Stefanos:
http://lists.osmocom.org/pipermail/simtrace/2012-November/000406.html
I followed Benoit's advice to view the details as follows (using the inputs
from the web page):
rand_bin =
stringToByte(a2b_hex('00000000000000000000000000000000'))
autn_bin = stringToByte(a2b_hex('ec9320c2c2000000e1dd22c1ad3e2d3d'))
u.authenticate(RAND=rand_bin, AUTN=autn_bin,ctx='3G')
u.coms()
['INTERNAL AUTHENTICATE apdu: 00 88 00 81 22 10 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 10 EC 93 20 C2 C2 00 00 00 E1 DD 22 C1 AD 3E 2D 3D',
'sw1, sw2: 98 62 - undefined status',
(152, 98),
[]]
From TS 31.102, section 7.3.1 it looks like this means a MAC failure (0x98
0x62)
Can anyone point me to a resource for computing parameters with a valid MAC?
Thanks for your attention,
Rupert 
7:05 p.m.
Hey there,
why would he need K? He's calling Authenticate APDU on the SIM directly.
however, where did you get your AUTN data? 3G authentication is supposed to
be mutual, you have to pass AUTN coming from the correct network, otherwise
the SIM rejects to Authenticate you to the "spoofed" network. Isn't this
your problem?
Cheers!
Lukas
On Mon, Mar 11, 2013 at 6:25 PM, benoit michau <michau.benoit(a)gmail.com>wrote;wrote:
Hello,
to perform a 3G authentication with a USIM, you need to know the
authentication key K and counter SQN within the USIM.
RAND / AUTN generation is explained in TS 33.102, section 6.3.
2013/3/9 Rupert Lloyd <rupert.lloyd(a)gmail.com>om>:
Good Afternoon,
I am trying to perform USIM/3G authentication using osmo-sim-auth and ran
into the same problem as Stefanos:
http://lists.osmocom.org/pipermail/simtrace/2012-November/000406.html
I followed Benoit's advice to view the details as follows (using the
inputs
from the web page):
00
rand_bin =
stringToByte(a2b_hex('00000000000000000000000000000000'))
autn_bin = stringToByte(a2b_hex('ec9320c2c2000000e1dd22c1ad3e2d3d'))
u.authenticate(RAND=rand_bin, AUTN=autn_bin,ctx='3G')
u.coms()
['INTERNAL AUTHENTICATE apdu: 00 88 00 81 22 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 EC 93 20 C2 C2 00 00 00
E1 DD 22 C1 AD 3E 2D 3D',
'sw1, sw2: 98 62 - undefined status',
(152, 98),
[]]
From TS 31.102, section 7.3.1 it looks like this means a MAC failure
(0x98
0x62)
Can anyone point me to a resource for computing parameters with a valid
MAC?
Thanks for your attention,
Rupert
7:45 p.m.
On Mon, Mar 11, 2013 at 2:05 PM, Lukas Kuzmiak <lukash(a)backstep.net> wrote:
why would he need K? He's calling Authenticate
APDU on the SIM directly.
however, where did you get your AUTN data? 3G authentication is supposed
to be mutual, you have to pass AUTN coming from the correct network,
otherwise the SIM rejects to Authenticate you to the "spoofed" network.
Isn't this your problem
Yes - I was naively using the input vector from the example on
http://openbsc.osmocom.org/trac/wiki/osmo-sim-auth to see what happened (I
am new at this!)
Having read through the specs I think that I understand - the vector needs
to be synchronized with the USIM's stored value of SQN and the MAC will be
generated using an operator-specific variant of f1
Is that correct?
Rupert
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3 comments
3 participants
participants (3)
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benoit michau -
Lukas Kuzmiak -
Rupert Lloyd