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TDLS: Do not modify RNonce for an TPK M1 frame with same INonce

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There is no point in updating the RNonce for every obtained TPK M1 frame
(e.g., retransmission due to timeout) with the same INonce (SNonce in
FTIE). Update RNonce only if a TPK M1 is received with a different
INonce (new TDLS session) to avoid issues with two setup exchanges
getting mixed and exchange failing due to mismatching nonces ("TDLS:
FTIE ANonce in TPK M3 does not match with FTIE ANonce used in TPK M2").

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Sunil Dutt 2013-09-15 12:09:40 -07:00 committed by Jouni Malinen
parent 8a658f2bdf
commit 1380fcbd9f
1 changed files with 17 additions and 6 deletions
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13
src/rsn_supp/tdls.c
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@ -1683,17 +1683,28 @@ skip_rsn:
}
ftie = (struct wpa_tdls_ftie *) kde.ftie;
os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
os_memcpy(peer->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
peer->rsnie_i_len = kde.rsn_ie_len;
peer->cipher = cipher;
if (os_memcmp(peer->inonce, ftie->Snonce, WPA_NONCE_LEN) != 0) {
/*
* There is no point in updating the RNonce for every obtained
* TPK M1 frame (e.g., retransmission due to timeout) with the
* same INonce (SNonce in FTIE). However, if the TPK M1 is
* retransmitted with a different INonce, update the RNonce
* since this is for a new TDLS session.
*/
wpa_printf(MSG_DEBUG,
"TDLS: New TPK M1 INonce - generate new RNonce");
os_memcpy(peer->inonce, ftie->Snonce, WPA_NONCE_LEN);
if (os_get_random(peer->rnonce, WPA_NONCE_LEN)) {
wpa_msg(sm->ctx->ctx, MSG_WARNING,
"TDLS: Failed to get random data for responder nonce");
wpa_tdls_peer_free(sm, peer);
goto error;
}
}
#if 0
/* get version info from RSNIE received from Peer */