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mesh: Check PMKID in AMPE Action frames

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From IEEE Std 802.11-2012 13.3.5:

   If the incoming Mesh Peering Management frame is for AMPE and the
   Chosen PMK from the received frame contains a PMKID that does not
   identify a valid mesh PMKSA, the frame shall be silently discarded.

We were not checking the PMKID previously, and we also weren't parsing
it correctly, so fix both.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
This commit is contained in:
Bob Copeland 2015-12-26 21:20:52 -05:00 committed by Jouni Malinen
parent 6c33eed3ee
commit b2817cd5c2
3 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
wpa_supplicant/mesh_mpm.c
View File

@ -74,8 +74,8 @@ static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
/* remove optional PMK at end */ /* remove optional PMK at end */
if (len >= 16) { if (len >= 16) {
len -= 16;
mpm_ie->pmk = ie + len - 16; mpm_ie->pmk = ie + len - 16;
len -= 16;
} }
if ((action_field == PLINK_OPEN && len != 4) || if ((action_field == PLINK_OPEN && len != 4) ||
@ -1014,6 +1014,7 @@ void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
if ((mconf->security & MESH_CONF_SEC_AMPE) && if ((mconf->security & MESH_CONF_SEC_AMPE) &&
mesh_rsn_process_ampe(wpa_s, sta, &elems, mesh_rsn_process_ampe(wpa_s, sta, &elems,
&mgmt->u.action.category, &mgmt->u.action.category,
peer_mgmt_ie.pmk,
ies, ie_len)) { ies, ie_len)) {
wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame"); wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
return; return;

7
wpa_supplicant/mesh_rsn.c
View File

@ -500,6 +500,7 @@ free:
int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta, int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
struct ieee802_11_elems *elems, const u8 *cat, struct ieee802_11_elems *elems, const u8 *cat,
const u8 *chosen_pmk,
const u8 *start, size_t elems_len) const u8 *start, size_t elems_len)
{ {
int ret = 0; int ret = 0;
@ -513,6 +514,12 @@ int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
const size_t aad_len[] = { ETH_ALEN, ETH_ALEN, const size_t aad_len[] = { ETH_ALEN, ETH_ALEN,
(elems->mic - 2) - cat }; (elems->mic - 2) - cat };
if (chosen_pmk && os_memcmp(chosen_pmk, sta->sae->pmkid, PMKID_LEN)) {
wpa_msg(wpa_s, MSG_DEBUG,
"Mesh RSN: Invalid PMKID (Chosen PMK did not match calculated PMKID)");
return -1;
}
if (!elems->mic || elems->mic_len < AES_BLOCK_SIZE) { if (!elems->mic || elems->mic_len < AES_BLOCK_SIZE) {
wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing mic ie"); wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing mic ie");
return -1; return -1;

1
wpa_supplicant/mesh_rsn.h
View File

@ -30,6 +30,7 @@ int mesh_rsn_protect_frame(struct mesh_rsn *rsn, struct sta_info *sta,
const u8 *cat, struct wpabuf *buf); const u8 *cat, struct wpabuf *buf);
int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta, int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
struct ieee802_11_elems *elems, const u8 *cat, struct ieee802_11_elems *elems, const u8 *cat,
const u8 *chosen_pmk,
const u8 *start, size_t elems_len); const u8 *start, size_t elems_len);
void mesh_auth_timer(void *eloop_ctx, void *user_data); void mesh_auth_timer(void *eloop_ctx, void *user_data);