Re: [PATCH 00/11] Basic SAE support for AP mode

[John Brandt <brandtwjohn@gmail.com>]

On 4/24/24 05:07, James Prestwood wrote:
> 
> On 4/22/24 6:52 AM, James Prestwood wrote:
>> Hi John,
>>
>> On 4/21/24 5:50 AM, John Brandt wrote:
>>> This set of patches adds basic SAE support for IWD in AP mode. It has
>>> been tested by connecting to IWD AP using wpa_supplicant. Note that this
>>> does not yet correspond to WPA3, since WPA3 would also require the
>>> support of Management Frame Protection.
>>>
>>> Normal client functionality has also been confirmed to still work. After
>>> applying these patches it remains possible for IWD client to connect to
>>> WPA3/SAE network.
>>>
>>> Remaining TODOs are to include better sanity-checking of received
>>> frames.
>>
>> I took a quick pass and I'm impressed you took the initiative to 
>> implement this. I do need to take a closer look from the spec side of 
>> things but overall it looks good.
>>
>> Assuming we are compliant with the spec my only concern merging this 
>> would be the TODOs. You do mention this is experimental and certain 
>> checks are not done, but you'd be surprised at the number of people 
>> using IWD in AP mode. The minute we merge this we're going to have 
>> people using it, which in its current form would be insecure. I think 
>> we first need to get the frame verification implemented as well as 
>> MFP. But anyways, this is a good start and I'll give it a full review 
>> when I have some time, hopefully this week.
>>
>> Thanks,
>>
>> James
> 
> Reviewed. I also forgot to mention the CI we have showed test-sae failed 
> after your patches, so that will need to be addressed as well. I keep 
> getting reminded I need to also email the patch submitter.
> 
> Thanks,
> 
> James

Thanks, I've mostly incorporated the feedback, and also added extra 
frame checks. I can post the v2 version later this week.

I'm unsure whether I'll also have the time to experiment with MFP. Maybe 
it's possible to already add SAE support without yet mentioning WPA3 for 
the AP mode?

>>
>>>
>>> John Brandt (11):
>>>    ap: ability to advertise PSK and SAE
>>>    ap: accept PSK/SAE in auth depending on config
>>>    sae: add function sae_set_group
>>>    sae: refactor and add function sae_calculate_keys
>>>    sae: make sae_process_commit callable in AP mode
>>>    sae: verify offered group in AP mode
>>>    sae: support reception of Confirm frame by AP
>>>    ap: add support to handle SAE authentication
>>>    ap: enable start of 4-way HS after SAE
>>>    eapol: support PTK derivation with SHA256
>>>    eapol: encrypt key data for AKM-defined ciphers
>>>
>>>   src/ap.c    | 135 +++++++++++++++++++++++++++++++++-------
>>>   src/eapol.c |  58 ++++++++++++-----
>>>   src/sae.c   | 175 +++++++++++++++++++++++++++++++++-------------------
>>>   3 files changed, 265 insertions(+), 103 deletions(-)
>>>