[PATCH] Add some documentation relating to EAP-AKA.

Ben Greear greearb at candelatech.com
Tue Jan 7 13:23:15 EST 2014


On 01/07/2014 05:28 AM, Jouni Malinen wrote:
> On Fri, Jan 03, 2014 at 04:10:16PM -0800, greearb at candelatech.com wrote:
>> diff --git a/wpa_supplicant/defconfig b/wpa_supplicant/defconfig
>> -# gnutls = GnuTLS
>> +# gnutls = GnuTLS (Missing some features needed by EAP-AKA with USIM, at least)
> 
> This is not exactly complete and I would much rather make this work with
> EAP-SIM and EAP-AKA or make the build fail than expect people to notice
> and understand this note in defconfig.
> 
>> diff --git a/wpa_supplicant/wpa_supplicant.conf b/wpa_supplicant/wpa_supplicant.conf
>> @@ -658,6 +658,8 @@ fast_reauth=1
>>  # identity: Identity string for EAP
>>  #	This field is also used to configure user NAI for
>>  #	EAP-PSK/PAX/SAKE/GPSK.
>> +#       For EAP-AKA, it is  1 | IMSI
>> +#       For EAP-SIM, it is  0 | IMSI
> 
> That is not correct. EAP-SIM does normally (but not always!) use 1 as
> the prefix and EAP-AKA uses 0 (again, not always). Anyway, these would
> not normally be configured by users since the identity is generated
> automatically based on IMSI read from SIM/USIM. In other words, these
> prefixes are reversed and only used in some test scenarios with
> simulated SIM/USIM and as such, I don't think it is appropriate to
> document these in this style. Furthermore, this is not really even
> complete since the realm part is not included. I would be fine listing
> the examples for software simulated version if they are marked as such
> (and well, obviously, if they are correct).
> 
>>  # anonymous_identity: Anonymous identity string for EAP (to be used as the
>>  #	unencrypted identity with EAP types that support different tunnelled
>>  #	identity, e.g., EAP-TTLS). This field can also be used with
>> @@ -671,6 +673,8 @@ fast_reauth=1
>>  #	PSK) is also configured using this field. For EAP-GPSK, this is a
>>  #	variable length PSK. ext:<name of external password field> format can
>>  #	be used to indicate that the password is stored in external storage.
>> +#       For EAP-AKA, the syntax is K:OPc:SQN
>> +#       For EAP-SIM, the syntax is K:OPc
> 
> Again, this is very much for special corner cases. This would never be
> used in normal EAP-SIM/AKA cases.

I did screw up the 1 vs 0 for AKA and SIM.  I'll clean this up and
repost for consideration, even if just to help the next person who
searches the web.

The best info I could find previously was this link, and it
is missing some details as well:

http://comments.gmane.org/gmane.linux.drivers.hostap/24684

Thanks,
Ben

-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com



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