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sae: fix a spec violation with duplicate commits

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If a commit is received while in an accepted state the spec states
the scalar should be checked against the previous commit and if
equal the message should be silently dropped.
This commit is contained in:
James Prestwood 2021-09-08 11:18:58 -07:00 committed by Denis Kenzior
parent 799e7af9c7
commit 8ca638fb88
1 changed files with 25 additions and 3 deletions
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28
src/sae.c
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@ -1182,10 +1182,32 @@ static int sae_verify_accepted(struct sae_sm *sm, uint16_t trans,
{
uint16_t sc;
/* spec does not specify what to do here, so print and discard */
if (trans != SAE_STATE_CONFIRMED) {
/*
* 12.4.8.6.1 Parent process behavior
*
* "Upon receipt of an SAE Commit message... and it is in Accepted
* state, the scalar in the received frame is checked against the
* peer-scalar used in authentication of the existing protocol instance
* (in Accepted state). If it is identical, the frame shall be dropped"
*/
if (trans == SAE_STATE_COMMITTED) {
bool drop;
unsigned int nbytes = l_ecc_curve_get_scalar_bytes(sm->curve);
struct l_ecc_scalar *p_scalar;
if (len < nbytes + 2)
return -EMSGSIZE;
p_scalar = l_ecc_scalar_new(sm->curve, frame + 2, nbytes);
drop = l_ecc_scalars_are_equal(sm->p_scalar, p_scalar);
l_ecc_scalar_free(p_scalar);
if (drop)
return -EBADMSG;
l_error("received transaction %u in accepted state", trans);
return -EBADMSG;
return -EPROTO;
}
if (sm->sync > SAE_SYNC_MAX)