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SAE: Do not allow re-use of peer-scalar in a new protocol instance

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IEEE Std 802.11-2012, 11.3.8.6.1: If there is a protocol instance for
the peer and it is in Authenticated state, the new Commit Message
shall be dropped if the peer-scalar is identical to the one used in
the existing protocol instance.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-12-31 11:20:04 +02:00
parent dd43026a19
commit 4838ff3ef4
1 changed files with 14 additions and 0 deletions
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14
src/common/sae.c
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@ -518,6 +518,20 @@ u16 sae_parse_commit(struct sae_data *sae, const u8 *data, size_t len)
wpa_printf(MSG_DEBUG, "SAE: Not enough data for scalar");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
/*
* IEEE Std 802.11-2012, 11.3.8.6.1: If there is a protocol instance for
* the peer and it is in Authenticated state, the new Commit Message
* shall be dropped if the peer-scalar is identical to the one used in
* the existing protocol instance.
*/
if (sae->state == SAE_ACCEPTED &&
os_memcmp(sae->peer_commit_scalar, pos, val_len) == 0) {
wpa_printf(MSG_DEBUG, "SAE: Do not accept re-use of previous "
"peer-commit-scalar");
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
os_memcpy(sae->peer_commit_scalar, pos, val_len);
wpa_hexdump(MSG_DEBUG, "SAE: Peer commit-scalar",
sae->peer_commit_scalar, val_len);