wifi wpa2 psk length >51 does not work? - Solved

kosmonaut pirx
 
Posts: 17
Joined: Mon Jan 02, 2017 11:35 pm

wifi wpa2 psk length >51 does not work? - Solved

Tue Jan 03, 2017 10:20 pm

hello,
got my vocore2 last year already, starting to use it finally. First catch, however, wifi connection between vorcore and hostapd can't be established.

After several ours (first suspect always: special chars) figured out, wpa2 psk key length seems to be a problem. Simple example (hostapd.conf snippet):

Code: Select all
## does not work, 52chars
wpa_passphrase=0123456789012345678901234567890123456789012345678901

## works, 51chars
wpa_passphrase=012345678901234567890123456789012345678901234567890


Inserted appropriate counterpart at /etc/config/wireless at the vocore, of course.

I don't want to change the key just for this 'cause of other stations. So, maybe anyone can confirm and/or has a workaround at hand?
Of course, already searched for the net a lot.

As there are exactly 12chars missing to max of 63chars, I suspect bssid (default: mac-address, 12chars) is perhaps related in some way..

thanks&regards
Last edited by kosmonaut pirx on Thu Jan 05, 2017 9:43 pm, edited 1 time in total.

Vonger
 
Posts: 896
Joined: Sun Oct 19, 2014 6:00 am

Re: wifi wpa2 psk length >51 does not work?

Wed Jan 04, 2017 12:47 am

Oh? where do you setup this? i do not know this yet :)

kosmonaut pirx
 
Posts: 17
Joined: Mon Jan 02, 2017 11:35 pm

Re: wifi wpa2 psk length >51 does not work?

Wed Jan 04, 2017 8:27 pm

hello,
the AP is running hostapd, so it's under my direct control. I may change anything there in the corresponding conf file. At vocore it's the usual wirelesl-config file

Setup:
AP: running Gentoo Linux
4.7.0-rc2-g3058387 #9 SMP PREEMPT Sun Jul 10 12:48:03 CEST 2016 armv7l SAMSUNG EXYNOS (Flattened Device Tree) GNU/Linux
Hostapd
net-wireless/hostapd
Latest version available: 2.5
Latest version installed: 2.5

STA: Vocore2
root@OpenWrt:/# uname -a
Linux OpenWrt 3.18.29 #32 Sat Dec 24 22:01:05 CST 2016 mips GNU/Linux

I just checked a different AP (my phone) and same behavior: said 51char psk key and vocore connects, 52char psk key no connection.
Other stations (RPi, Phone)connect to said AP without problems since a year or more.

Part of /etc/config/wireless looks like this:
Code: Select all
config wifi-iface 'sta'
        option device 'radio0'
        option mode 'sta'
        option network 'wwan'
        option ifname 'apcli0'
        option led 'mediatek:orange:wifi'
#      example ssid
        option ssid 'jolla'
        option key '012345678901234567890123456789012345678901234567890'
        option encryption 'psk2+ccmp'


I noticed wifi connection is build up with the help of some kind /sbin/ap_client, which is a binary provided by mtk-sdk-wifi, kind of MediaTek soft, I guess. Did try a replacement, but the known wpa_supplicant does not work unfortunately

regards

kosmonaut pirx
 
Posts: 17
Joined: Mon Jan 02, 2017 11:35 pm

Re: wifi wpa2 psk length >51 does not work?

Wed Jan 04, 2017 9:04 pm

Some more investigations and kind-of success.

There's most likely something wrong in the used mediatek binary. Looking at some kind of code found here:
https://github.com/MediaTek-Labs/linkit-smart-7688-feed/blob/master/mtk-sdk-wifi/src/ap_client.c

It uses ioctls via 'iwpriv'. So i did the some from cli:
root@OpenWrt:/# iwpriv apcli0 set ApCliWPAPSK='0123456789012345678901234567890123456789012345678901'
and voila, immediate connection :!:

I guess using a 64char buf is not enough in
[code]
static void iwpriv(const char *name, const char *key, const char *val):
//...
[char data[64];

snprintf(data, 64, "%s=%s", key, val);/code]

This explains the missing 12 chars: "ApCliWPAPSK" is 11chars and the '=' is number 12

@Vonger: Where may I get the source of the mtk-sdk-wifi you sue to check for a patch working? Afterwards I'll close this as solved.
Thanks

Vonger
 
Posts: 896
Joined: Sun Oct 19, 2014 6:00 am

Re: wifi wpa2 psk length >51 does not work?

Thu Jan 05, 2017 12:39 am

Wi-Fi driver from mediatek is not open source yet. :( Current one is from Linkit.

kosmonaut pirx
 
Posts: 17
Joined: Mon Jan 02, 2017 11:35 pm

Re: wifi wpa2 psk length >51 does not work?

Thu Jan 05, 2017 9:41 pm

That's exactly what I suspected :(

so maybe the board needs to be patched after each firmware update for this, but maybe it's even possible via rc.local.
Thanks a lot.

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