15b9c547cSRui Paulo /*
25b9c547cSRui Paulo  * WPA Supplicant - Mesh RSN routines
35b9c547cSRui Paulo  * Copyright (c) 2013-2014, cozybit, Inc.  All rights reserved.
45b9c547cSRui Paulo  *
55b9c547cSRui Paulo  * This software may be distributed under the terms of the BSD license.
65b9c547cSRui Paulo  * See README for more details.
75b9c547cSRui Paulo  */
85b9c547cSRui Paulo 
95b9c547cSRui Paulo #include "utils/includes.h"
105b9c547cSRui Paulo 
115b9c547cSRui Paulo #include "utils/common.h"
125b9c547cSRui Paulo #include "utils/eloop.h"
135b9c547cSRui Paulo #include "crypto/sha256.h"
145b9c547cSRui Paulo #include "crypto/random.h"
155b9c547cSRui Paulo #include "crypto/aes.h"
165b9c547cSRui Paulo #include "crypto/aes_siv.h"
175b9c547cSRui Paulo #include "rsn_supp/wpa.h"
185b9c547cSRui Paulo #include "ap/hostapd.h"
195b9c547cSRui Paulo #include "ap/wpa_auth.h"
205b9c547cSRui Paulo #include "ap/sta_info.h"
215b9c547cSRui Paulo #include "ap/ieee802_11.h"
225b9c547cSRui Paulo #include "wpa_supplicant_i.h"
235b9c547cSRui Paulo #include "driver_i.h"
245b9c547cSRui Paulo #include "wpas_glue.h"
255b9c547cSRui Paulo #include "mesh_mpm.h"
265b9c547cSRui Paulo #include "mesh_rsn.h"
275b9c547cSRui Paulo 
285b9c547cSRui Paulo #define MESH_AUTH_TIMEOUT 10
295b9c547cSRui Paulo #define MESH_AUTH_RETRY 3
305b9c547cSRui Paulo 
mesh_auth_timer(void * eloop_ctx,void * user_data)315b9c547cSRui Paulo void mesh_auth_timer(void *eloop_ctx, void *user_data)
325b9c547cSRui Paulo {
335b9c547cSRui Paulo 	struct wpa_supplicant *wpa_s = eloop_ctx;
345b9c547cSRui Paulo 	struct sta_info *sta = user_data;
35780fb4a2SCy Schubert 	struct hostapd_data *hapd;
365b9c547cSRui Paulo 
375b9c547cSRui Paulo 	if (sta->sae->state != SAE_ACCEPTED) {
385b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: Re-authenticate with " MACSTR
395b9c547cSRui Paulo 			   " (attempt %d) ",
405b9c547cSRui Paulo 			   MAC2STR(sta->addr), sta->sae_auth_retry);
415b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_FAILURE "addr=" MACSTR,
425b9c547cSRui Paulo 			MAC2STR(sta->addr));
435b9c547cSRui Paulo 		if (sta->sae_auth_retry < MESH_AUTH_RETRY) {
445b9c547cSRui Paulo 			mesh_rsn_auth_sae_sta(wpa_s, sta);
455b9c547cSRui Paulo 		} else {
46780fb4a2SCy Schubert 			hapd = wpa_s->ifmsh->bss[0];
47780fb4a2SCy Schubert 
485b9c547cSRui Paulo 			if (sta->sae_auth_retry > MESH_AUTH_RETRY) {
49780fb4a2SCy Schubert 				ap_free_sta(hapd, sta);
505b9c547cSRui Paulo 				return;
515b9c547cSRui Paulo 			}
525b9c547cSRui Paulo 
535b9c547cSRui Paulo 			/* block the STA if exceeded the number of attempts */
545b9c547cSRui Paulo 			wpa_mesh_set_plink_state(wpa_s, sta, PLINK_BLOCKED);
555b9c547cSRui Paulo 			sta->sae->state = SAE_NOTHING;
565b9c547cSRui Paulo 			wpa_msg(wpa_s, MSG_INFO, MESH_SAE_AUTH_BLOCKED "addr="
575b9c547cSRui Paulo 				MACSTR " duration=%d",
585b9c547cSRui Paulo 				MAC2STR(sta->addr),
59780fb4a2SCy Schubert 				hapd->conf->ap_max_inactivity);
605b9c547cSRui Paulo 		}
615b9c547cSRui Paulo 		sta->sae_auth_retry++;
625b9c547cSRui Paulo 	}
635b9c547cSRui Paulo }
645b9c547cSRui Paulo 
655b9c547cSRui Paulo 
auth_logger(void * ctx,const u8 * addr,logger_level level,const char * txt)665b9c547cSRui Paulo static void auth_logger(void *ctx, const u8 *addr, logger_level level,
675b9c547cSRui Paulo 			const char *txt)
685b9c547cSRui Paulo {
695b9c547cSRui Paulo 	if (addr)
705b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: " MACSTR " - %s",
715b9c547cSRui Paulo 			   MAC2STR(addr), txt);
725b9c547cSRui Paulo 	else
735b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: %s", txt);
745b9c547cSRui Paulo }
755b9c547cSRui Paulo 
765b9c547cSRui Paulo 
auth_get_psk(void * ctx,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)775b9c547cSRui Paulo static const u8 *auth_get_psk(void *ctx, const u8 *addr,
7885732ac8SCy Schubert 			      const u8 *p2p_dev_addr, const u8 *prev_psk,
794bc52338SCy Schubert 			      size_t *psk_len, int *vlan_id)
805b9c547cSRui Paulo {
815b9c547cSRui Paulo 	struct mesh_rsn *mesh_rsn = ctx;
825b9c547cSRui Paulo 	struct hostapd_data *hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
835b9c547cSRui Paulo 	struct sta_info *sta = ap_get_sta(hapd, addr);
845b9c547cSRui Paulo 
8585732ac8SCy Schubert 	if (psk_len)
8685732ac8SCy Schubert 		*psk_len = PMK_LEN;
874bc52338SCy Schubert 	if (vlan_id)
884bc52338SCy Schubert 		*vlan_id = 0;
895b9c547cSRui Paulo 	wpa_printf(MSG_DEBUG, "AUTH: %s (addr=" MACSTR " prev_psk=%p)",
905b9c547cSRui Paulo 		   __func__, MAC2STR(addr), prev_psk);
915b9c547cSRui Paulo 
925b9c547cSRui Paulo 	if (sta && sta->auth_alg == WLAN_AUTH_SAE) {
935b9c547cSRui Paulo 		if (!sta->sae || prev_psk)
945b9c547cSRui Paulo 			return NULL;
955b9c547cSRui Paulo 		return sta->sae->pmk;
965b9c547cSRui Paulo 	}
975b9c547cSRui Paulo 
985b9c547cSRui Paulo 	return NULL;
995b9c547cSRui Paulo }
1005b9c547cSRui Paulo 
1015b9c547cSRui Paulo 
auth_set_key(void * ctx,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len,enum key_flag key_flag)1025b9c547cSRui Paulo static int auth_set_key(void *ctx, int vlan_id, enum wpa_alg alg,
103*c1d255d3SCy Schubert 			const u8 *addr, int idx, u8 *key, size_t key_len,
104*c1d255d3SCy Schubert 			enum key_flag key_flag)
1055b9c547cSRui Paulo {
1065b9c547cSRui Paulo 	struct mesh_rsn *mesh_rsn = ctx;
1075b9c547cSRui Paulo 	u8 seq[6];
1085b9c547cSRui Paulo 
1095b9c547cSRui Paulo 	os_memset(seq, 0, sizeof(seq));
1105b9c547cSRui Paulo 
1115b9c547cSRui Paulo 	if (addr) {
1125b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d addr=" MACSTR
1135b9c547cSRui Paulo 			   " key_idx=%d)",
1145b9c547cSRui Paulo 			   __func__, alg, MAC2STR(addr), idx);
1155b9c547cSRui Paulo 	} else {
1165b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: %s(alg=%d key_idx=%d)",
1175b9c547cSRui Paulo 			   __func__, alg, idx);
1185b9c547cSRui Paulo 	}
1195b9c547cSRui Paulo 	wpa_hexdump_key(MSG_DEBUG, "AUTH: set_key - key", key, key_len);
1205b9c547cSRui Paulo 
1215b9c547cSRui Paulo 	return wpa_drv_set_key(mesh_rsn->wpa_s, alg, addr, idx,
122*c1d255d3SCy Schubert 			       1, seq, 6, key, key_len, key_flag);
1235b9c547cSRui Paulo }
1245b9c547cSRui Paulo 
1255b9c547cSRui Paulo 
auth_start_ampe(void * ctx,const u8 * addr)1265b9c547cSRui Paulo static int auth_start_ampe(void *ctx, const u8 *addr)
1275b9c547cSRui Paulo {
1285b9c547cSRui Paulo 	struct mesh_rsn *mesh_rsn = ctx;
1295b9c547cSRui Paulo 	struct hostapd_data *hapd;
1305b9c547cSRui Paulo 	struct sta_info *sta;
1315b9c547cSRui Paulo 
1325b9c547cSRui Paulo 	if (mesh_rsn->wpa_s->current_ssid->mode != WPAS_MODE_MESH)
1335b9c547cSRui Paulo 		return -1;
1345b9c547cSRui Paulo 
1355b9c547cSRui Paulo 	hapd = mesh_rsn->wpa_s->ifmsh->bss[0];
1365b9c547cSRui Paulo 	sta = ap_get_sta(hapd, addr);
1375b9c547cSRui Paulo 	if (sta)
1385b9c547cSRui Paulo 		eloop_cancel_timeout(mesh_auth_timer, mesh_rsn->wpa_s, sta);
1395b9c547cSRui Paulo 
1405b9c547cSRui Paulo 	mesh_mpm_auth_peer(mesh_rsn->wpa_s, addr);
1415b9c547cSRui Paulo 	return 0;
1425b9c547cSRui Paulo }
1435b9c547cSRui Paulo 
1445b9c547cSRui Paulo 
__mesh_rsn_auth_init(struct mesh_rsn * rsn,const u8 * addr,enum mfp_options ieee80211w,int ocv)145780fb4a2SCy Schubert static int __mesh_rsn_auth_init(struct mesh_rsn *rsn, const u8 *addr,
1464bc52338SCy Schubert 				enum mfp_options ieee80211w, int ocv)
1475b9c547cSRui Paulo {
1485b9c547cSRui Paulo 	struct wpa_auth_config conf;
14985732ac8SCy Schubert 	static const struct wpa_auth_callbacks cb = {
15085732ac8SCy Schubert 		.logger = auth_logger,
15185732ac8SCy Schubert 		.get_psk = auth_get_psk,
15285732ac8SCy Schubert 		.set_key = auth_set_key,
15385732ac8SCy Schubert 		.start_ampe = auth_start_ampe,
15485732ac8SCy Schubert 	};
1555b9c547cSRui Paulo 	u8 seq[6] = {};
1565b9c547cSRui Paulo 
1575b9c547cSRui Paulo 	wpa_printf(MSG_DEBUG, "AUTH: Initializing group state machine");
1585b9c547cSRui Paulo 
1595b9c547cSRui Paulo 	os_memset(&conf, 0, sizeof(conf));
160780fb4a2SCy Schubert 	conf.wpa = WPA_PROTO_RSN;
1615b9c547cSRui Paulo 	conf.wpa_key_mgmt = WPA_KEY_MGMT_SAE;
162780fb4a2SCy Schubert 	conf.wpa_pairwise = rsn->pairwise_cipher;
163780fb4a2SCy Schubert 	conf.rsn_pairwise = rsn->pairwise_cipher;
164780fb4a2SCy Schubert 	conf.wpa_group = rsn->group_cipher;
1655b9c547cSRui Paulo 	conf.eapol_version = 0;
1665b9c547cSRui Paulo 	conf.wpa_group_rekey = -1;
16785732ac8SCy Schubert 	conf.wpa_group_update_count = 4;
16885732ac8SCy Schubert 	conf.wpa_pairwise_update_count = 4;
169780fb4a2SCy Schubert 	conf.ieee80211w = ieee80211w;
170780fb4a2SCy Schubert 	if (ieee80211w != NO_MGMT_FRAME_PROTECTION)
171780fb4a2SCy Schubert 		conf.group_mgmt_cipher = rsn->mgmt_group_cipher;
1724bc52338SCy Schubert #ifdef CONFIG_OCV
1734bc52338SCy Schubert 	conf.ocv = ocv;
1744bc52338SCy Schubert #endif /* CONFIG_OCV */
1755b9c547cSRui Paulo 
17685732ac8SCy Schubert 	rsn->auth = wpa_init(addr, &conf, &cb, rsn);
1775b9c547cSRui Paulo 	if (rsn->auth == NULL) {
1785b9c547cSRui Paulo 		wpa_printf(MSG_DEBUG, "AUTH: wpa_init() failed");
1795b9c547cSRui Paulo 		return -1;
1805b9c547cSRui Paulo 	}
1815b9c547cSRui Paulo 
1825b9c547cSRui Paulo 	/* TODO: support rekeying */
183780fb4a2SCy Schubert 	rsn->mgtk_len = wpa_cipher_key_len(conf.wpa_group);
184780fb4a2SCy Schubert 	if (random_get_bytes(rsn->mgtk, rsn->mgtk_len) < 0)
1855b9c547cSRui Paulo 		return -1;
186780fb4a2SCy Schubert 	rsn->mgtk_key_id = 1;
187780fb4a2SCy Schubert 
188780fb4a2SCy Schubert 	if (ieee80211w != NO_MGMT_FRAME_PROTECTION) {
189780fb4a2SCy Schubert 		rsn->igtk_len = wpa_cipher_key_len(conf.group_mgmt_cipher);
190780fb4a2SCy Schubert 		if (random_get_bytes(rsn->igtk, rsn->igtk_len) < 0)
191780fb4a2SCy Schubert 			return -1;
192780fb4a2SCy Schubert 		rsn->igtk_key_id = 4;
1935b9c547cSRui Paulo 
1945b9c547cSRui Paulo 		/* group mgmt */
195780fb4a2SCy Schubert 		wpa_hexdump_key(MSG_DEBUG, "mesh: Own TX IGTK",
196780fb4a2SCy Schubert 				rsn->igtk, rsn->igtk_len);
197780fb4a2SCy Schubert 		wpa_drv_set_key(rsn->wpa_s,
198*c1d255d3SCy Schubert 				wpa_cipher_to_alg(rsn->mgmt_group_cipher),
199*c1d255d3SCy Schubert 				broadcast_ether_addr,
200780fb4a2SCy Schubert 				rsn->igtk_key_id, 1,
201*c1d255d3SCy Schubert 				seq, sizeof(seq), rsn->igtk, rsn->igtk_len,
202*c1d255d3SCy Schubert 				KEY_FLAG_GROUP_TX_DEFAULT);
203780fb4a2SCy Schubert 	}
2045b9c547cSRui Paulo 
2055b9c547cSRui Paulo 	/* group privacy / data frames */
206780fb4a2SCy Schubert 	wpa_hexdump_key(MSG_DEBUG, "mesh: Own TX MGTK",
207780fb4a2SCy Schubert 			rsn->mgtk, rsn->mgtk_len);
208*c1d255d3SCy Schubert 	wpa_drv_set_key(rsn->wpa_s, wpa_cipher_to_alg(rsn->group_cipher),
209*c1d255d3SCy Schubert 			broadcast_ether_addr,
210780fb4a2SCy Schubert 			rsn->mgtk_key_id, 1, seq, sizeof(seq),
211*c1d255d3SCy Schubert 			rsn->mgtk, rsn->mgtk_len, KEY_FLAG_GROUP_TX_DEFAULT);
2125b9c547cSRui Paulo 
2135b9c547cSRui Paulo 	return 0;
2145b9c547cSRui Paulo }
2155b9c547cSRui Paulo 
2165b9c547cSRui Paulo 
mesh_rsn_deinit(struct mesh_rsn * rsn)2175b9c547cSRui Paulo static void mesh_rsn_deinit(struct mesh_rsn *rsn)
2185b9c547cSRui Paulo {
2195b9c547cSRui Paulo 	os_memset(rsn->mgtk, 0, sizeof(rsn->mgtk));
220780fb4a2SCy Schubert 	rsn->mgtk_len = 0;
221780fb4a2SCy Schubert 	os_memset(rsn->igtk, 0, sizeof(rsn->igtk));
222780fb4a2SCy Schubert 	rsn->igtk_len = 0;
223325151a3SRui Paulo 	if (rsn->auth)
2245b9c547cSRui Paulo 		wpa_deinit(rsn->auth);
2255b9c547cSRui Paulo }
2265b9c547cSRui Paulo 
2275b9c547cSRui Paulo 
mesh_rsn_auth_init(struct wpa_supplicant * wpa_s,struct mesh_conf * conf)2285b9c547cSRui Paulo struct mesh_rsn *mesh_rsn_auth_init(struct wpa_supplicant *wpa_s,
2295b9c547cSRui Paulo 				    struct mesh_conf *conf)
2305b9c547cSRui Paulo {
2315b9c547cSRui Paulo 	struct mesh_rsn *mesh_rsn;
2325b9c547cSRui Paulo 	struct hostapd_data *bss = wpa_s->ifmsh->bss[0];
2335b9c547cSRui Paulo 	const u8 *ie;
2345b9c547cSRui Paulo 	size_t ie_len;
23585732ac8SCy Schubert #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
23685732ac8SCy Schubert 	struct external_pmksa_cache *entry;
23785732ac8SCy Schubert #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
2385b9c547cSRui Paulo 
2395b9c547cSRui Paulo 	mesh_rsn = os_zalloc(sizeof(*mesh_rsn));
2405b9c547cSRui Paulo 	if (mesh_rsn == NULL)
2415b9c547cSRui Paulo 		return NULL;
2425b9c547cSRui Paulo 	mesh_rsn->wpa_s = wpa_s;
243780fb4a2SCy Schubert 	mesh_rsn->pairwise_cipher = conf->pairwise_cipher;
244780fb4a2SCy Schubert 	mesh_rsn->group_cipher = conf->group_cipher;
245780fb4a2SCy Schubert 	mesh_rsn->mgmt_group_cipher = conf->mgmt_group_cipher;
2465b9c547cSRui Paulo 
247780fb4a2SCy Schubert 	if (__mesh_rsn_auth_init(mesh_rsn, wpa_s->own_addr,
2484bc52338SCy Schubert 				 conf->ieee80211w, conf->ocv) < 0) {
2495b9c547cSRui Paulo 		mesh_rsn_deinit(mesh_rsn);
250325151a3SRui Paulo 		os_free(mesh_rsn);
2515b9c547cSRui Paulo 		return NULL;
2525b9c547cSRui Paulo 	}
2535b9c547cSRui Paulo 
2545b9c547cSRui Paulo 	bss->wpa_auth = mesh_rsn->auth;
2555b9c547cSRui Paulo 
25685732ac8SCy Schubert #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
25785732ac8SCy Schubert 	while ((entry = dl_list_last(&wpa_s->mesh_external_pmksa_cache,
25885732ac8SCy Schubert 				     struct external_pmksa_cache,
25985732ac8SCy Schubert 				     list)) != NULL) {
26085732ac8SCy Schubert 		int ret;
26185732ac8SCy Schubert 
26285732ac8SCy Schubert 		ret = wpa_auth_pmksa_add_entry(bss->wpa_auth,
26385732ac8SCy Schubert 					       entry->pmksa_cache);
26485732ac8SCy Schubert 		dl_list_del(&entry->list);
26585732ac8SCy Schubert 		os_free(entry);
26685732ac8SCy Schubert 
26785732ac8SCy Schubert 		if (ret < 0)
26885732ac8SCy Schubert 			return NULL;
26985732ac8SCy Schubert 	}
27085732ac8SCy Schubert #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
27185732ac8SCy Schubert 
2725b9c547cSRui Paulo 	ie = wpa_auth_get_wpa_ie(mesh_rsn->auth, &ie_len);
273325151a3SRui Paulo 	conf->rsn_ie = (u8 *) ie;
274325151a3SRui Paulo 	conf->rsn_ie_len = ie_len;
2755b9c547cSRui Paulo 
2765b9c547cSRui Paulo 	wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
2775b9c547cSRui Paulo 
2785b9c547cSRui Paulo 	return mesh_rsn;
2795b9c547cSRui Paulo }
2805b9c547cSRui Paulo 
2815b9c547cSRui Paulo 
index_within_array(const int * array,int idx)2825b9c547cSRui Paulo static int index_within_array(const int *array, int idx)
2835b9c547cSRui Paulo {
2845b9c547cSRui Paulo 	int i;
2855b9c547cSRui Paulo 
2865b9c547cSRui Paulo 	for (i = 0; i < idx; i++) {
2875b9c547cSRui Paulo 		if (array[i] == -1)
2885b9c547cSRui Paulo 			return 0;
2895b9c547cSRui Paulo 	}
2905b9c547cSRui Paulo 
2915b9c547cSRui Paulo 	return 1;
2925b9c547cSRui Paulo }
2935b9c547cSRui Paulo 
2945b9c547cSRui Paulo 
mesh_rsn_sae_group(struct wpa_supplicant * wpa_s,struct sae_data * sae)2955b9c547cSRui Paulo static int mesh_rsn_sae_group(struct wpa_supplicant *wpa_s,
2965b9c547cSRui Paulo 			      struct sae_data *sae)
2975b9c547cSRui Paulo {
2985b9c547cSRui Paulo 	int *groups = wpa_s->ifmsh->bss[0]->conf->sae_groups;
2995b9c547cSRui Paulo 
3005b9c547cSRui Paulo 	/* Configuration may have changed, so validate current index */
3015b9c547cSRui Paulo 	if (!index_within_array(groups, wpa_s->mesh_rsn->sae_group_index))
3025b9c547cSRui Paulo 		return -1;
3035b9c547cSRui Paulo 
3045b9c547cSRui Paulo 	for (;;) {
3055b9c547cSRui Paulo 		int group = groups[wpa_s->mesh_rsn->sae_group_index];
3065b9c547cSRui Paulo 
3075b9c547cSRui Paulo 		if (group <= 0)
3085b9c547cSRui Paulo 			break;
3095b9c547cSRui Paulo 		if (sae_set_group(sae, group) == 0) {
3105b9c547cSRui Paulo 			wpa_dbg(wpa_s, MSG_DEBUG, "SME: Selected SAE group %d",
3115b9c547cSRui Paulo 				sae->group);
3125b9c547cSRui Paulo 			return 0;
3135b9c547cSRui Paulo 		}
3145b9c547cSRui Paulo 		wpa_s->mesh_rsn->sae_group_index++;
3155b9c547cSRui Paulo 	}
3165b9c547cSRui Paulo 
3175b9c547cSRui Paulo 	return -1;
3185b9c547cSRui Paulo }
3195b9c547cSRui Paulo 
3205b9c547cSRui Paulo 
mesh_rsn_build_sae_commit(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid,struct sta_info * sta)3215b9c547cSRui Paulo static int mesh_rsn_build_sae_commit(struct wpa_supplicant *wpa_s,
3225b9c547cSRui Paulo 				     struct wpa_ssid *ssid,
3235b9c547cSRui Paulo 				     struct sta_info *sta)
3245b9c547cSRui Paulo {
32585732ac8SCy Schubert 	const char *password;
32685732ac8SCy Schubert 
32785732ac8SCy Schubert 	password = ssid->sae_password;
32885732ac8SCy Schubert 	if (!password)
32985732ac8SCy Schubert 		password = ssid->passphrase;
33085732ac8SCy Schubert 	if (!password) {
3315b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "SAE: No password available");
3325b9c547cSRui Paulo 		return -1;
3335b9c547cSRui Paulo 	}
3345b9c547cSRui Paulo 
3355b9c547cSRui Paulo 	if (mesh_rsn_sae_group(wpa_s, sta->sae) < 0) {
3365b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "SAE: Failed to select group");
3375b9c547cSRui Paulo 		return -1;
3385b9c547cSRui Paulo 	}
3395b9c547cSRui Paulo 
34085732ac8SCy Schubert 	if (sta->sae->tmp && !sta->sae->tmp->pw_id && ssid->sae_password_id) {
34185732ac8SCy Schubert 		sta->sae->tmp->pw_id = os_strdup(ssid->sae_password_id);
34285732ac8SCy Schubert 		if (!sta->sae->tmp->pw_id)
34385732ac8SCy Schubert 			return -1;
34485732ac8SCy Schubert 	}
3455b9c547cSRui Paulo 	return sae_prepare_commit(wpa_s->own_addr, sta->addr,
34685732ac8SCy Schubert 				  (u8 *) password, os_strlen(password),
34785732ac8SCy Schubert 				  sta->sae);
3485b9c547cSRui Paulo }
3495b9c547cSRui Paulo 
3505b9c547cSRui Paulo 
3515b9c547cSRui Paulo /* initiate new SAE authentication with sta */
mesh_rsn_auth_sae_sta(struct wpa_supplicant * wpa_s,struct sta_info * sta)3525b9c547cSRui Paulo int mesh_rsn_auth_sae_sta(struct wpa_supplicant *wpa_s,
3535b9c547cSRui Paulo 			  struct sta_info *sta)
3545b9c547cSRui Paulo {
3555b9c547cSRui Paulo 	struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
3565b9c547cSRui Paulo 	struct wpa_ssid *ssid = wpa_s->current_ssid;
357780fb4a2SCy Schubert 	struct rsn_pmksa_cache_entry *pmksa;
3585b9c547cSRui Paulo 	unsigned int rnd;
3595b9c547cSRui Paulo 	int ret;
3605b9c547cSRui Paulo 
3615b9c547cSRui Paulo 	if (!ssid) {
3625b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG,
3635b9c547cSRui Paulo 			"AUTH: No current_ssid known to initiate new SAE");
3645b9c547cSRui Paulo 		return -1;
3655b9c547cSRui Paulo 	}
3665b9c547cSRui Paulo 
3675b9c547cSRui Paulo 	if (!sta->sae) {
3685b9c547cSRui Paulo 		sta->sae = os_zalloc(sizeof(*sta->sae));
3695b9c547cSRui Paulo 		if (sta->sae == NULL)
3705b9c547cSRui Paulo 			return -1;
3715b9c547cSRui Paulo 	}
3725b9c547cSRui Paulo 
37385732ac8SCy Schubert 	pmksa = wpa_auth_pmksa_get(hapd->wpa_auth, sta->addr, NULL);
374780fb4a2SCy Schubert 	if (pmksa) {
375780fb4a2SCy Schubert 		if (!sta->wpa_sm)
376780fb4a2SCy Schubert 			sta->wpa_sm = wpa_auth_sta_init(hapd->wpa_auth,
377780fb4a2SCy Schubert 							sta->addr, NULL);
378780fb4a2SCy Schubert 		if (!sta->wpa_sm) {
379780fb4a2SCy Schubert 			wpa_printf(MSG_ERROR,
380780fb4a2SCy Schubert 				   "mesh: Failed to initialize RSN state machine");
381780fb4a2SCy Schubert 			return -1;
382780fb4a2SCy Schubert 		}
383780fb4a2SCy Schubert 
384780fb4a2SCy Schubert 		wpa_printf(MSG_DEBUG,
385780fb4a2SCy Schubert 			   "AUTH: Mesh PMKSA cache entry found for " MACSTR
386780fb4a2SCy Schubert 			   " - try to use PMKSA caching instead of new SAE authentication",
387780fb4a2SCy Schubert 			   MAC2STR(sta->addr));
388780fb4a2SCy Schubert 		wpa_auth_pmksa_set_to_sm(pmksa, sta->wpa_sm, hapd->wpa_auth,
389780fb4a2SCy Schubert 					 sta->sae->pmkid, sta->sae->pmk);
390780fb4a2SCy Schubert 		sae_accept_sta(hapd, sta);
391780fb4a2SCy Schubert 		sta->mesh_sae_pmksa_caching = 1;
392780fb4a2SCy Schubert 		return 0;
393780fb4a2SCy Schubert 	}
394780fb4a2SCy Schubert 	sta->mesh_sae_pmksa_caching = 0;
395780fb4a2SCy Schubert 
3965b9c547cSRui Paulo 	if (mesh_rsn_build_sae_commit(wpa_s, ssid, sta))
3975b9c547cSRui Paulo 		return -1;
3985b9c547cSRui Paulo 
3995b9c547cSRui Paulo 	wpa_msg(wpa_s, MSG_DEBUG,
4005b9c547cSRui Paulo 		"AUTH: started authentication with SAE peer: " MACSTR,
4015b9c547cSRui Paulo 		MAC2STR(sta->addr));
4025b9c547cSRui Paulo 
4035b9c547cSRui Paulo 	ret = auth_sae_init_committed(hapd, sta);
4045b9c547cSRui Paulo 	if (ret)
4055b9c547cSRui Paulo 		return ret;
4065b9c547cSRui Paulo 
4075b9c547cSRui Paulo 	eloop_cancel_timeout(mesh_auth_timer, wpa_s, sta);
4085b9c547cSRui Paulo 	rnd = rand() % MESH_AUTH_TIMEOUT;
4095b9c547cSRui Paulo 	eloop_register_timeout(MESH_AUTH_TIMEOUT + rnd, 0, mesh_auth_timer,
4105b9c547cSRui Paulo 			       wpa_s, sta);
4115b9c547cSRui Paulo 	return 0;
4125b9c547cSRui Paulo }
4135b9c547cSRui Paulo 
4145b9c547cSRui Paulo 
mesh_rsn_get_pmkid(struct mesh_rsn * rsn,struct sta_info * sta,u8 * pmkid)4155b9c547cSRui Paulo void mesh_rsn_get_pmkid(struct mesh_rsn *rsn, struct sta_info *sta, u8 *pmkid)
4165b9c547cSRui Paulo {
417780fb4a2SCy Schubert 	os_memcpy(pmkid, sta->sae->pmkid, SAE_PMKID_LEN);
4185b9c547cSRui Paulo }
4195b9c547cSRui Paulo 
4205b9c547cSRui Paulo 
4215b9c547cSRui Paulo static void
mesh_rsn_derive_aek(struct mesh_rsn * rsn,struct sta_info * sta)4225b9c547cSRui Paulo mesh_rsn_derive_aek(struct mesh_rsn *rsn, struct sta_info *sta)
4235b9c547cSRui Paulo {
4245b9c547cSRui Paulo 	u8 *myaddr = rsn->wpa_s->own_addr;
4255b9c547cSRui Paulo 	u8 *peer = sta->addr;
426780fb4a2SCy Schubert 	u8 *addr1, *addr2;
427780fb4a2SCy Schubert 	u8 context[RSN_SELECTOR_LEN + 2 * ETH_ALEN], *ptr = context;
4285b9c547cSRui Paulo 
429780fb4a2SCy Schubert 	/*
430780fb4a2SCy Schubert 	 * AEK = KDF-Hash-256(PMK, "AEK Derivation", Selected AKM Suite ||
431780fb4a2SCy Schubert 	 *       min(localMAC, peerMAC) || max(localMAC, peerMAC))
432780fb4a2SCy Schubert 	 */
433780fb4a2SCy Schubert 	/* Selected AKM Suite: SAE */
434780fb4a2SCy Schubert 	RSN_SELECTOR_PUT(ptr, RSN_AUTH_KEY_MGMT_SAE);
435780fb4a2SCy Schubert 	ptr += RSN_SELECTOR_LEN;
4365b9c547cSRui Paulo 
4375b9c547cSRui Paulo 	if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
4385b9c547cSRui Paulo 		addr1 = myaddr;
4395b9c547cSRui Paulo 		addr2 = peer;
440780fb4a2SCy Schubert 	} else {
441780fb4a2SCy Schubert 		addr1 = peer;
442780fb4a2SCy Schubert 		addr2 = myaddr;
4435b9c547cSRui Paulo 	}
444780fb4a2SCy Schubert 	os_memcpy(ptr, addr1, ETH_ALEN);
445780fb4a2SCy Schubert 	ptr += ETH_ALEN;
446780fb4a2SCy Schubert 	os_memcpy(ptr, addr2, ETH_ALEN);
4475b9c547cSRui Paulo 
4485b9c547cSRui Paulo 	sha256_prf(sta->sae->pmk, sizeof(sta->sae->pmk), "AEK Derivation",
4495b9c547cSRui Paulo 		   context, sizeof(context), sta->aek, sizeof(sta->aek));
4505b9c547cSRui Paulo }
4515b9c547cSRui Paulo 
4525b9c547cSRui Paulo 
4535b9c547cSRui Paulo /* derive mesh temporal key from pmk */
mesh_rsn_derive_mtk(struct wpa_supplicant * wpa_s,struct sta_info * sta)4545b9c547cSRui Paulo int mesh_rsn_derive_mtk(struct wpa_supplicant *wpa_s, struct sta_info *sta)
4555b9c547cSRui Paulo {
4565b9c547cSRui Paulo 	u8 *ptr;
4575b9c547cSRui Paulo 	u8 *min, *max;
4585b9c547cSRui Paulo 	u8 *myaddr = wpa_s->own_addr;
4595b9c547cSRui Paulo 	u8 *peer = sta->addr;
460780fb4a2SCy Schubert 	u8 context[2 * WPA_NONCE_LEN + 2 * 2 + RSN_SELECTOR_LEN + 2 * ETH_ALEN];
4615b9c547cSRui Paulo 
462780fb4a2SCy Schubert 	/*
463780fb4a2SCy Schubert 	 * MTK = KDF-Hash-Length(PMK, "Temporal Key Derivation", min(localNonce,
464780fb4a2SCy Schubert 	 *  peerNonce) || max(localNonce, peerNonce) || min(localLinkID,
465780fb4a2SCy Schubert 	 *  peerLinkID) || max(localLinkID, peerLinkID) || Selected AKM Suite ||
466780fb4a2SCy Schubert 	 *  min(localMAC, peerMAC) || max(localMAC, peerMAC))
467780fb4a2SCy Schubert 	 */
4685b9c547cSRui Paulo 	ptr = context;
469780fb4a2SCy Schubert 	if (os_memcmp(sta->my_nonce, sta->peer_nonce, WPA_NONCE_LEN) < 0) {
4705b9c547cSRui Paulo 		min = sta->my_nonce;
4715b9c547cSRui Paulo 		max = sta->peer_nonce;
4725b9c547cSRui Paulo 	} else {
4735b9c547cSRui Paulo 		min = sta->peer_nonce;
4745b9c547cSRui Paulo 		max = sta->my_nonce;
4755b9c547cSRui Paulo 	}
476780fb4a2SCy Schubert 	os_memcpy(ptr, min, WPA_NONCE_LEN);
477780fb4a2SCy Schubert 	ptr += WPA_NONCE_LEN;
478780fb4a2SCy Schubert 	os_memcpy(ptr, max, WPA_NONCE_LEN);
479780fb4a2SCy Schubert 	ptr += WPA_NONCE_LEN;
4805b9c547cSRui Paulo 
4815b9c547cSRui Paulo 	if (sta->my_lid < sta->peer_lid) {
482780fb4a2SCy Schubert 		WPA_PUT_LE16(ptr, sta->my_lid);
483780fb4a2SCy Schubert 		ptr += 2;
484780fb4a2SCy Schubert 		WPA_PUT_LE16(ptr, sta->peer_lid);
485780fb4a2SCy Schubert 		ptr += 2;
4865b9c547cSRui Paulo 	} else {
487780fb4a2SCy Schubert 		WPA_PUT_LE16(ptr, sta->peer_lid);
488780fb4a2SCy Schubert 		ptr += 2;
489780fb4a2SCy Schubert 		WPA_PUT_LE16(ptr, sta->my_lid);
490780fb4a2SCy Schubert 		ptr += 2;
4915b9c547cSRui Paulo 	}
4925b9c547cSRui Paulo 
493780fb4a2SCy Schubert 	/* Selected AKM Suite: SAE */
494780fb4a2SCy Schubert 	RSN_SELECTOR_PUT(ptr, RSN_AUTH_KEY_MGMT_SAE);
495780fb4a2SCy Schubert 	ptr += RSN_SELECTOR_LEN;
4965b9c547cSRui Paulo 
4975b9c547cSRui Paulo 	if (os_memcmp(myaddr, peer, ETH_ALEN) < 0) {
4985b9c547cSRui Paulo 		min = myaddr;
4995b9c547cSRui Paulo 		max = peer;
5005b9c547cSRui Paulo 	} else {
5015b9c547cSRui Paulo 		min = peer;
5025b9c547cSRui Paulo 		max = myaddr;
5035b9c547cSRui Paulo 	}
5045b9c547cSRui Paulo 	os_memcpy(ptr, min, ETH_ALEN);
505780fb4a2SCy Schubert 	ptr += ETH_ALEN;
506780fb4a2SCy Schubert 	os_memcpy(ptr, max, ETH_ALEN);
5075b9c547cSRui Paulo 
508780fb4a2SCy Schubert 	sta->mtk_len = wpa_cipher_key_len(wpa_s->mesh_rsn->pairwise_cipher);
509780fb4a2SCy Schubert 	sha256_prf(sta->sae->pmk, SAE_PMK_LEN,
5105b9c547cSRui Paulo 		   "Temporal Key Derivation", context, sizeof(context),
511780fb4a2SCy Schubert 		   sta->mtk, sta->mtk_len);
5125b9c547cSRui Paulo 	return 0;
5135b9c547cSRui Paulo }
5145b9c547cSRui Paulo 
5155b9c547cSRui Paulo 
mesh_rsn_init_ampe_sta(struct wpa_supplicant * wpa_s,struct sta_info * sta)5165b9c547cSRui Paulo void mesh_rsn_init_ampe_sta(struct wpa_supplicant *wpa_s, struct sta_info *sta)
5175b9c547cSRui Paulo {
518780fb4a2SCy Schubert 	if (random_get_bytes(sta->my_nonce, WPA_NONCE_LEN) < 0) {
5195b9c547cSRui Paulo 		wpa_printf(MSG_INFO, "mesh: Failed to derive random nonce");
5205b9c547cSRui Paulo 		/* TODO: How to handle this more cleanly? */
5215b9c547cSRui Paulo 	}
522780fb4a2SCy Schubert 	os_memset(sta->peer_nonce, 0, WPA_NONCE_LEN);
5235b9c547cSRui Paulo 	mesh_rsn_derive_aek(wpa_s->mesh_rsn, sta);
5245b9c547cSRui Paulo }
5255b9c547cSRui Paulo 
5265b9c547cSRui Paulo 
5275b9c547cSRui Paulo /* insert AMPE and encrypted MIC at @ie.
5285b9c547cSRui Paulo  * @mesh_rsn: mesh RSN context
5295b9c547cSRui Paulo  * @sta: STA we're sending to
5305b9c547cSRui Paulo  * @cat: pointer to category code in frame header.
5315b9c547cSRui Paulo  * @buf: wpabuf to add encrypted AMPE and MIC to.
5325b9c547cSRui Paulo  * */
mesh_rsn_protect_frame(struct mesh_rsn * rsn,struct sta_info * sta,const u8 * cat,struct wpabuf * buf)5335b9c547cSRui Paulo int mesh_rsn_protect_frame(struct mesh_rsn *rsn, struct sta_info *sta,
5345b9c547cSRui Paulo 			   const u8 *cat, struct wpabuf *buf)
5355b9c547cSRui Paulo {
5365b9c547cSRui Paulo 	struct ieee80211_ampe_ie *ampe;
5375b9c547cSRui Paulo 	u8 const *ie = wpabuf_head_u8(buf) + wpabuf_len(buf);
538780fb4a2SCy Schubert 	u8 *ampe_ie, *pos, *mic_payload;
5395b9c547cSRui Paulo 	const u8 *aad[] = { rsn->wpa_s->own_addr, sta->addr, cat };
5405b9c547cSRui Paulo 	const size_t aad_len[] = { ETH_ALEN, ETH_ALEN, ie - cat };
5415b9c547cSRui Paulo 	int ret = 0;
542780fb4a2SCy Schubert 	size_t len;
5435b9c547cSRui Paulo 
544780fb4a2SCy Schubert 	len = sizeof(*ampe);
545780fb4a2SCy Schubert 	if (cat[1] == PLINK_OPEN)
546780fb4a2SCy Schubert 		len += rsn->mgtk_len + WPA_KEY_RSC_LEN + 4;
547780fb4a2SCy Schubert 	if (cat[1] == PLINK_OPEN && rsn->igtk_len)
548780fb4a2SCy Schubert 		len += 2 + 6 + rsn->igtk_len;
549780fb4a2SCy Schubert 
550780fb4a2SCy Schubert 	if (2 + AES_BLOCK_SIZE + 2 + len > wpabuf_tailroom(buf)) {
5515b9c547cSRui Paulo 		wpa_printf(MSG_ERROR, "protect frame: buffer too small");
5525b9c547cSRui Paulo 		return -EINVAL;
5535b9c547cSRui Paulo 	}
5545b9c547cSRui Paulo 
555780fb4a2SCy Schubert 	ampe_ie = os_zalloc(2 + len);
5565b9c547cSRui Paulo 	if (!ampe_ie) {
5575b9c547cSRui Paulo 		wpa_printf(MSG_ERROR, "protect frame: out of memory");
5585b9c547cSRui Paulo 		return -ENOMEM;
5595b9c547cSRui Paulo 	}
5605b9c547cSRui Paulo 
5615b9c547cSRui Paulo 	/*  IE: AMPE */
5625b9c547cSRui Paulo 	ampe_ie[0] = WLAN_EID_AMPE;
563780fb4a2SCy Schubert 	ampe_ie[1] = len;
5645b9c547cSRui Paulo 	ampe = (struct ieee80211_ampe_ie *) (ampe_ie + 2);
5655b9c547cSRui Paulo 
5665b9c547cSRui Paulo 	RSN_SELECTOR_PUT(ampe->selected_pairwise_suite,
567780fb4a2SCy Schubert 			 RSN_CIPHER_SUITE_CCMP);
568780fb4a2SCy Schubert 	os_memcpy(ampe->local_nonce, sta->my_nonce, WPA_NONCE_LEN);
569780fb4a2SCy Schubert 	os_memcpy(ampe->peer_nonce, sta->peer_nonce, WPA_NONCE_LEN);
570780fb4a2SCy Schubert 
571780fb4a2SCy Schubert 	pos = (u8 *) (ampe + 1);
572780fb4a2SCy Schubert 	if (cat[1] != PLINK_OPEN)
573780fb4a2SCy Schubert 		goto skip_keys;
574780fb4a2SCy Schubert 
575780fb4a2SCy Schubert 	/* TODO: Key Replay Counter[8] optionally for
576780fb4a2SCy Schubert 	 * Mesh Group Key Inform/Acknowledge frames */
577780fb4a2SCy Schubert 
5785b9c547cSRui Paulo 	/* TODO: static mgtk for now since we don't support rekeying! */
579780fb4a2SCy Schubert 	/*
580780fb4a2SCy Schubert 	 * GTKdata[variable]:
581780fb4a2SCy Schubert 	 * MGTK[variable] || Key RSC[8] || GTKExpirationTime[4]
582780fb4a2SCy Schubert 	 */
583780fb4a2SCy Schubert 	os_memcpy(pos, rsn->mgtk, rsn->mgtk_len);
584780fb4a2SCy Schubert 	pos += rsn->mgtk_len;
585780fb4a2SCy Schubert 	wpa_drv_get_seqnum(rsn->wpa_s, NULL, rsn->mgtk_key_id, pos);
586780fb4a2SCy Schubert 	pos += WPA_KEY_RSC_LEN;
587780fb4a2SCy Schubert 	/* Use fixed GTKExpirationTime for now */
588780fb4a2SCy Schubert 	WPA_PUT_LE32(pos, 0xffffffff);
589780fb4a2SCy Schubert 	pos += 4;
590780fb4a2SCy Schubert 
591780fb4a2SCy Schubert 	/*
592780fb4a2SCy Schubert 	 * IGTKdata[variable]:
593780fb4a2SCy Schubert 	 * Key ID[2], IPN[6], IGTK[variable]
594780fb4a2SCy Schubert 	 */
595780fb4a2SCy Schubert 	if (rsn->igtk_len) {
596780fb4a2SCy Schubert 		WPA_PUT_LE16(pos, rsn->igtk_key_id);
597780fb4a2SCy Schubert 		pos += 2;
598780fb4a2SCy Schubert 		wpa_drv_get_seqnum(rsn->wpa_s, NULL, rsn->igtk_key_id, pos);
599780fb4a2SCy Schubert 		pos += 6;
600780fb4a2SCy Schubert 		os_memcpy(pos, rsn->igtk, rsn->igtk_len);
601780fb4a2SCy Schubert 	}
602780fb4a2SCy Schubert 
603780fb4a2SCy Schubert skip_keys:
604780fb4a2SCy Schubert 	wpa_hexdump_key(MSG_DEBUG, "mesh: Plaintext AMPE element",
605780fb4a2SCy Schubert 			ampe_ie, 2 + len);
6065b9c547cSRui Paulo 
6075b9c547cSRui Paulo 	/* IE: MIC */
608780fb4a2SCy Schubert 	wpabuf_put_u8(buf, WLAN_EID_MIC);
609780fb4a2SCy Schubert 	wpabuf_put_u8(buf, AES_BLOCK_SIZE);
6105b9c547cSRui Paulo 	/* MIC field is output ciphertext */
6115b9c547cSRui Paulo 
6125b9c547cSRui Paulo 	/* encrypt after MIC */
613780fb4a2SCy Schubert 	mic_payload = wpabuf_put(buf, 2 + len + AES_BLOCK_SIZE);
6145b9c547cSRui Paulo 
61585732ac8SCy Schubert 	if (aes_siv_encrypt(sta->aek, sizeof(sta->aek), ampe_ie, 2 + len, 3,
6165b9c547cSRui Paulo 			    aad, aad_len, mic_payload)) {
6175b9c547cSRui Paulo 		wpa_printf(MSG_ERROR, "protect frame: failed to encrypt");
6185b9c547cSRui Paulo 		ret = -ENOMEM;
6195b9c547cSRui Paulo 	}
6205b9c547cSRui Paulo 
6215b9c547cSRui Paulo 	os_free(ampe_ie);
6225b9c547cSRui Paulo 
6235b9c547cSRui Paulo 	return ret;
6245b9c547cSRui Paulo }
6255b9c547cSRui Paulo 
6265b9c547cSRui Paulo 
mesh_rsn_process_ampe(struct wpa_supplicant * wpa_s,struct sta_info * sta,struct ieee802_11_elems * elems,const u8 * cat,const u8 * chosen_pmk,const u8 * start,size_t elems_len)6275b9c547cSRui Paulo int mesh_rsn_process_ampe(struct wpa_supplicant *wpa_s, struct sta_info *sta,
6285b9c547cSRui Paulo 			  struct ieee802_11_elems *elems, const u8 *cat,
629780fb4a2SCy Schubert 			  const u8 *chosen_pmk,
6305b9c547cSRui Paulo 			  const u8 *start, size_t elems_len)
6315b9c547cSRui Paulo {
6325b9c547cSRui Paulo 	int ret = 0;
6335b9c547cSRui Paulo 	struct ieee80211_ampe_ie *ampe;
634780fb4a2SCy Schubert 	u8 null_nonce[WPA_NONCE_LEN] = {};
6355b9c547cSRui Paulo 	u8 ampe_eid;
6365b9c547cSRui Paulo 	u8 ampe_ie_len;
637780fb4a2SCy Schubert 	u8 *ampe_buf, *crypt = NULL, *pos, *end;
6385b9c547cSRui Paulo 	size_t crypt_len;
6395b9c547cSRui Paulo 	const u8 *aad[] = { sta->addr, wpa_s->own_addr, cat };
6405b9c547cSRui Paulo 	const size_t aad_len[] = { ETH_ALEN, ETH_ALEN,
6414bc52338SCy Schubert 				   elems->mic ? (elems->mic - 2) - cat : 0 };
642780fb4a2SCy Schubert 	size_t key_len;
643780fb4a2SCy Schubert 
644780fb4a2SCy Schubert 	if (!sta->sae) {
645780fb4a2SCy Schubert 		struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
646780fb4a2SCy Schubert 
64785732ac8SCy Schubert 		if (!wpa_auth_pmksa_get(hapd->wpa_auth, sta->addr, NULL)) {
648780fb4a2SCy Schubert 			wpa_printf(MSG_INFO,
649780fb4a2SCy Schubert 				   "Mesh RSN: SAE is not prepared yet");
650780fb4a2SCy Schubert 			return -1;
651780fb4a2SCy Schubert 		}
652780fb4a2SCy Schubert 		mesh_rsn_auth_sae_sta(wpa_s, sta);
653780fb4a2SCy Schubert 	}
654780fb4a2SCy Schubert 
6554bc52338SCy Schubert 	if (chosen_pmk &&
6564bc52338SCy Schubert 	    (!sta->sae ||
6574bc52338SCy Schubert 	     os_memcmp(chosen_pmk, sta->sae->pmkid, PMKID_LEN) != 0)) {
658780fb4a2SCy Schubert 		wpa_msg(wpa_s, MSG_DEBUG,
659780fb4a2SCy Schubert 			"Mesh RSN: Invalid PMKID (Chosen PMK did not match calculated PMKID)");
660780fb4a2SCy Schubert 		return -1;
661780fb4a2SCy Schubert 	}
6625b9c547cSRui Paulo 
6635b9c547cSRui Paulo 	if (!elems->mic || elems->mic_len < AES_BLOCK_SIZE) {
6645b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing mic ie");
6655b9c547cSRui Paulo 		return -1;
6665b9c547cSRui Paulo 	}
6675b9c547cSRui Paulo 
6685b9c547cSRui Paulo 	ampe_buf = (u8 *) elems->mic + elems->mic_len;
6695b9c547cSRui Paulo 	if ((int) elems_len < ampe_buf - start)
6705b9c547cSRui Paulo 		return -1;
6715b9c547cSRui Paulo 
6725b9c547cSRui Paulo 	crypt_len = elems_len - (elems->mic - start);
673780fb4a2SCy Schubert 	if (crypt_len < 2 + AES_BLOCK_SIZE) {
6745b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: missing ampe ie");
6755b9c547cSRui Paulo 		return -1;
6765b9c547cSRui Paulo 	}
6775b9c547cSRui Paulo 
6785b9c547cSRui Paulo 	/* crypt is modified by siv_decrypt */
6795b9c547cSRui Paulo 	crypt = os_zalloc(crypt_len);
6805b9c547cSRui Paulo 	if (!crypt) {
6815b9c547cSRui Paulo 		wpa_printf(MSG_ERROR, "Mesh RSN: out of memory");
6825b9c547cSRui Paulo 		ret = -ENOMEM;
6835b9c547cSRui Paulo 		goto free;
6845b9c547cSRui Paulo 	}
6855b9c547cSRui Paulo 
6865b9c547cSRui Paulo 	os_memcpy(crypt, elems->mic, crypt_len);
6875b9c547cSRui Paulo 
68885732ac8SCy Schubert 	if (aes_siv_decrypt(sta->aek, sizeof(sta->aek), crypt, crypt_len, 3,
6895b9c547cSRui Paulo 			    aad, aad_len, ampe_buf)) {
6905b9c547cSRui Paulo 		wpa_printf(MSG_ERROR, "Mesh RSN: frame verification failed!");
691780fb4a2SCy Schubert 		ret = -2;
6925b9c547cSRui Paulo 		goto free;
6935b9c547cSRui Paulo 	}
6945b9c547cSRui Paulo 
695780fb4a2SCy Schubert 	crypt_len -= AES_BLOCK_SIZE;
696780fb4a2SCy Schubert 	wpa_hexdump_key(MSG_DEBUG, "mesh: Decrypted AMPE element",
697780fb4a2SCy Schubert 			ampe_buf, crypt_len);
698780fb4a2SCy Schubert 
6995b9c547cSRui Paulo 	ampe_eid = *ampe_buf++;
7005b9c547cSRui Paulo 	ampe_ie_len = *ampe_buf++;
7015b9c547cSRui Paulo 
7025b9c547cSRui Paulo 	if (ampe_eid != WLAN_EID_AMPE ||
703780fb4a2SCy Schubert 	    (size_t) 2 + ampe_ie_len > crypt_len ||
7045b9c547cSRui Paulo 	    ampe_ie_len < sizeof(struct ieee80211_ampe_ie)) {
7055b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid ampe ie");
7065b9c547cSRui Paulo 		ret = -1;
7075b9c547cSRui Paulo 		goto free;
7085b9c547cSRui Paulo 	}
7095b9c547cSRui Paulo 
7105b9c547cSRui Paulo 	ampe = (struct ieee80211_ampe_ie *) ampe_buf;
711780fb4a2SCy Schubert 	pos = (u8 *) (ampe + 1);
712780fb4a2SCy Schubert 	end = ampe_buf + ampe_ie_len;
713780fb4a2SCy Schubert 	if (os_memcmp(ampe->peer_nonce, null_nonce, WPA_NONCE_LEN) != 0 &&
714780fb4a2SCy Schubert 	    os_memcmp(ampe->peer_nonce, sta->my_nonce, WPA_NONCE_LEN) != 0) {
7155b9c547cSRui Paulo 		wpa_msg(wpa_s, MSG_DEBUG, "Mesh RSN: invalid peer nonce");
7165b9c547cSRui Paulo 		ret = -1;
7175b9c547cSRui Paulo 		goto free;
7185b9c547cSRui Paulo 	}
7195b9c547cSRui Paulo 	os_memcpy(sta->peer_nonce, ampe->local_nonce,
7205b9c547cSRui Paulo 		  sizeof(ampe->local_nonce));
7215b9c547cSRui Paulo 
722780fb4a2SCy Schubert 	/* TODO: Key Replay Counter[8] in Mesh Group Key Inform/Acknowledge
723780fb4a2SCy Schubert 	 * frames */
724780fb4a2SCy Schubert 
725780fb4a2SCy Schubert 	/*
726780fb4a2SCy Schubert 	 * GTKdata shall not be included in Mesh Peering Confirm. While the
727780fb4a2SCy Schubert 	 * standard does not state the same about IGTKdata, that same constraint
728780fb4a2SCy Schubert 	 * needs to apply for it. It makes no sense to include the keys in Mesh
729780fb4a2SCy Schubert 	 * Peering Close frames either, so while the standard does not seem to
730780fb4a2SCy Schubert 	 * have a shall statement for these, they are described without
731780fb4a2SCy Schubert 	 * mentioning GTKdata.
732780fb4a2SCy Schubert 	 *
733780fb4a2SCy Schubert 	 * An earlier implementation used to add GTKdata to both Mesh Peering
734780fb4a2SCy Schubert 	 * Open and Mesh Peering Confirm frames, so ignore the possibly present
735780fb4a2SCy Schubert 	 * GTKdata frame without rejecting the frame as a backwards
736780fb4a2SCy Schubert 	 * compatibility mechanism.
737780fb4a2SCy Schubert 	 */
738780fb4a2SCy Schubert 	if (cat[1] != PLINK_OPEN) {
739780fb4a2SCy Schubert 		if (end > pos) {
740780fb4a2SCy Schubert 			wpa_hexdump_key(MSG_DEBUG,
741780fb4a2SCy Schubert 					"mesh: Ignore unexpected GTKdata(etc.) fields in the end of AMPE element in Mesh Peering Confirm/Close",
742780fb4a2SCy Schubert 					pos, end - pos);
743780fb4a2SCy Schubert 		}
744780fb4a2SCy Schubert 		goto free;
745780fb4a2SCy Schubert 	}
746780fb4a2SCy Schubert 
747780fb4a2SCy Schubert 	/*
748780fb4a2SCy Schubert 	 * GTKdata[variable]:
749780fb4a2SCy Schubert 	 * MGTK[variable] || Key RSC[8] || GTKExpirationTime[4]
750780fb4a2SCy Schubert 	 */
751780fb4a2SCy Schubert 	sta->mgtk_key_id = 1; /* FIX: Where to get Key ID? */
752780fb4a2SCy Schubert 	key_len = wpa_cipher_key_len(wpa_s->mesh_rsn->group_cipher);
753780fb4a2SCy Schubert 	if ((int) key_len + WPA_KEY_RSC_LEN + 4 > end - pos) {
754780fb4a2SCy Schubert 		wpa_dbg(wpa_s, MSG_DEBUG, "mesh: Truncated AMPE element");
755780fb4a2SCy Schubert 		ret = -1;
756780fb4a2SCy Schubert 		goto free;
757780fb4a2SCy Schubert 	}
758780fb4a2SCy Schubert 	sta->mgtk_len = key_len;
759780fb4a2SCy Schubert 	os_memcpy(sta->mgtk, pos, sta->mgtk_len);
760780fb4a2SCy Schubert 	wpa_hexdump_key(MSG_DEBUG, "mesh: GTKdata - MGTK",
761780fb4a2SCy Schubert 			sta->mgtk, sta->mgtk_len);
762780fb4a2SCy Schubert 	pos += sta->mgtk_len;
763780fb4a2SCy Schubert 	wpa_hexdump(MSG_DEBUG, "mesh: GTKdata - MGTK - Key RSC",
764780fb4a2SCy Schubert 		    pos, WPA_KEY_RSC_LEN);
765780fb4a2SCy Schubert 	os_memcpy(sta->mgtk_rsc, pos, sizeof(sta->mgtk_rsc));
766780fb4a2SCy Schubert 	pos += WPA_KEY_RSC_LEN;
767780fb4a2SCy Schubert 	wpa_printf(MSG_DEBUG,
768780fb4a2SCy Schubert 		   "mesh: GTKdata - MGTK - GTKExpirationTime: %u seconds",
769780fb4a2SCy Schubert 		   WPA_GET_LE32(pos));
770780fb4a2SCy Schubert 	pos += 4;
771780fb4a2SCy Schubert 
772780fb4a2SCy Schubert 	/*
773780fb4a2SCy Schubert 	 * IGTKdata[variable]:
774780fb4a2SCy Schubert 	 * Key ID[2], IPN[6], IGTK[variable]
775780fb4a2SCy Schubert 	 */
776780fb4a2SCy Schubert 	key_len = wpa_cipher_key_len(wpa_s->mesh_rsn->mgmt_group_cipher);
777780fb4a2SCy Schubert 	if (end - pos >= (int) (2 + 6 + key_len)) {
778780fb4a2SCy Schubert 		sta->igtk_key_id = WPA_GET_LE16(pos);
779780fb4a2SCy Schubert 		wpa_printf(MSG_DEBUG, "mesh: IGTKdata - Key ID %u",
780780fb4a2SCy Schubert 			   sta->igtk_key_id);
781780fb4a2SCy Schubert 		pos += 2;
782780fb4a2SCy Schubert 		os_memcpy(sta->igtk_rsc, pos, sizeof(sta->igtk_rsc));
783780fb4a2SCy Schubert 		wpa_hexdump(MSG_DEBUG, "mesh: IGTKdata - IPN",
784780fb4a2SCy Schubert 			    sta->igtk_rsc, sizeof(sta->igtk_rsc));
785780fb4a2SCy Schubert 		pos += 6;
786780fb4a2SCy Schubert 		os_memcpy(sta->igtk, pos, key_len);
787780fb4a2SCy Schubert 		sta->igtk_len = key_len;
788780fb4a2SCy Schubert 		wpa_hexdump_key(MSG_DEBUG, "mesh: IGTKdata - IGTK",
789780fb4a2SCy Schubert 				sta->igtk, sta->igtk_len);
790780fb4a2SCy Schubert 	}
791780fb4a2SCy Schubert 
7925b9c547cSRui Paulo free:
7935b9c547cSRui Paulo 	os_free(crypt);
7945b9c547cSRui Paulo 	return ret;
7955b9c547cSRui Paulo }
796