Hi Jouni,
You are correct. In the case where policy is set to SHOULD_ENCRYPT but MACsec capability is only MACSEC_CAP_INTEGRITY (i.e., integrity without confidentiality), my patch would have attempted to encrypt with offset 0. The patch should have retained the macsec_capable comparison. Something like this:
if ((kay->macsec_capable >= MACSEC_CAP_INTEG_AND_CONF) &&
(policy == SHOULD_ENCRYPT)) {
kay->macsec_encrypt = TRUE;
kay->macsec_confidentiality = CONFIDENTIALITY_OFFSET_0;
} else { /* SHOULD_SECURE */
kay->macsec_encrypt = FALSE;
kay->macsec_confidentiality = CONFIDENTIALITY_NONE;
}
Thanks,
- Mike
-----Original Message-----
From: Jouni Malinen [mailto:j@xxxxx]
Sent: Sunday, March 11, 2018 10:37 AM
To: Michael Siedzik <msiedzik@xxxxxxxxxxxxxxxxxxx>
Cc: hostap@xxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH 03/15] mka: Incorrect conf_offset sent in MKPDU when in policy mode "SHOULD_SECURE"
On Fri, Mar 02, 2018 at 03:10:51PM -0500, msiedzik@xxxxxxxxxxxxxxxxxxx wrote:
> diff --git a/src/pae/ieee802_1x_kay.c b/src/pae/ieee802_1x_kay.c @@
> -3166,14 +3167,16 @@ ieee802_1x_kay_init(struct ieee802_1x_kay_ctx *ctx, enum macsec_policy policy,
> } else {
> kay->macsec_desired = TRUE;
> kay->macsec_protect = TRUE;
> - kay->macsec_encrypt = policy == SHOULD_ENCRYPT;
> + if (policy == SHOULD_SECURE) {
> + kay->macsec_encrypt = FALSE;
> + kay->macsec_confidentiality = CONFIDENTIALITY_NONE;
> + } else { /* SHOULD_ENCRYPT */
> + kay->macsec_encrypt = TRUE;
> + kay->macsec_confidentiality = CONFIDENTIALITY_OFFSET_0;
> + }
> kay->macsec_validate = Strict;
> kay->macsec_replay_protect = FALSE;
> kay->macsec_replay_window = 0;
> - if (kay->macsec_capable >= MACSEC_CAP_INTEG_AND_CONF)
> - kay->macsec_confidentiality = CONFIDENTIALITY_OFFSET_0;
> - else
> - kay->macsec_confidentiality = CONFIDENTIALITY_NONE;
> }
Is this change dropping the kay->macsec_capable check on purpose for SHOULD_ENCRYPT case? The new SHOULD_SECURE case looks fine, but should the SHOULD_ENCRYPT case still use this kay->macsec_capable >= MACSEC_CAP_INTEG_AND_CONF before setting CONFIDENTIALITY_OFFSET_0?
--
Jouni Malinen PGP id EFC895FA
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