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handshake: fix OWE PTK derivation

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This bug has been in here since OWE was written, but a similar bug also
existed in hostapd which allowed the PTK derivation to be identical.
In January 2020 hostapd fixed this bug, which now makes IWD incompatible
when using group 20 or 21.

This patch fixes the bug for IWD, so now OWE should be compatible with
recent hostapd version. This will break compatibility with old hostapd
versions which still have this bug.
This commit is contained in:
James Prestwood 2020-03-24 12:07:57 -07:00 committed by Denis Kenzior
parent 6e8b765278
commit 972762b116
1 changed files with 10 additions and 2 deletions
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12
src/handshake.c
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@ -410,14 +410,22 @@ bool handshake_state_derive_ptk(struct handshake_state *s)
s->ptk_complete = false;
if (s->akm_suite & (IE_RSN_AKM_SUITE_FILS_SHA384 |
if (s->akm_suite & IE_RSN_AKM_SUITE_OWE) {
if (s->pmk_len == 32)
type = L_CHECKSUM_SHA256;
else if (s->pmk_len == 48)
type = L_CHECKSUM_SHA384;
else if (s->pmk_len == 64)
type = L_CHECKSUM_SHA512;
else
return false;
} else if (s->akm_suite & (IE_RSN_AKM_SUITE_FILS_SHA384 |
IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA384))
type = L_CHECKSUM_SHA384;
else if (s->akm_suite & (IE_RSN_AKM_SUITE_8021X_SHA256 |
IE_RSN_AKM_SUITE_PSK_SHA256 |
IE_RSN_AKM_SUITE_SAE_SHA256 |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256 |
IE_RSN_AKM_SUITE_OWE |
IE_RSN_AKM_SUITE_FILS_SHA256 |
IE_RSN_AKM_SUITE_FT_OVER_FILS_SHA256 |
IE_RSN_AKM_SUITE_OSEN))