Fail to access RSN property with DBus if pairwise cipher suite count is 0

Deroire, Guillaume Guillaume.Deroire at
Wed Mar 30 04:10:52 PDT 2022

Hi all,

I'm not able to get the RSN data from a WiFi network using the fi.w1.wpa_supplicant1.BSS DBus interface.

I get the following DBus error when I try to access the RSN property: "wpa_dbus_get_object_properties: failed to get object properties: (org.freedesktop.DBus.Error.Failed) failed to parse RSN IE"
If I enable wpa_supplicant debugging, I get the following: "wpa_parse_wpa_ie_rsn: ie count botch (pairwise), count 0 left 4"

The raw RSN IE data are the following: "300c0100000fac04000000000000"
Which I decode as:
        Element ID : 0x30
        Length : 0x0C
        Version : 1
        Group Cypher CCMP : 0x000fac04
        Pair wise cipher suite count : 0
        Authentication suite count : 0
        RSN capabilities : 0

wpa_supplicant rejects it due to "Pair wise cipher suite count = 0" but it seems to be valid.

I have a very reduced knowledge of WiFi internal, so could someone clarify if it is invalid and my AP is badly configured or if it is a valid RSN that must be supported ?

I have the same behavior with wpa_supplicant 2.7 and 2.9 and according to source code (, I'm expecting to have the same with the 'main' branch.


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