wlantest: Store last received GTK for each STA

This allows info_sta command to be used to fetch the last received GTK
separately for each STA.

Signed-hostap: Jouni Malinen <j@w1.fi>

wlantest/ctrl.c

@@ -990,6 +990,15 @@ static void info_print_state(char *buf, size_t len, int state)
 }
 
 
+static void info_print_gtk(char *buf, size_t len, struct wlantest_sta *sta)
+{
+	size_t pos;
+
+	pos = os_snprintf(buf, len, "IDX=%d,GTK=", sta->gtk_idx);
+	wpa_snprintf_hex(buf + pos, len - pos, sta->gtk, sta->gtk_len);
+}
+
+
 static void ctrl_info_sta(struct wlantest *wt, int sock, u8 *cmd, size_t clen)
 {
 	u8 *addr;
@@ -1029,6 +1038,9 @@ static void ctrl_info_sta(struct wlantest *wt, int sock, u8 *cmd, size_t clen)
 	case WLANTEST_STA_INFO_STATE:
 		info_print_state(resp, sizeof(resp), sta->state);
 		break;
+	case WLANTEST_STA_INFO_GTK:
+		info_print_gtk(resp, sizeof(resp), sta);
+		break;
 	default:
 		ctrl_send_simple(wt, sock, WLANTEST_CTRL_INVALID_CMD);
 		return;

wlantest/rx_eapol.c

@@ -326,8 +326,8 @@ static u8 * decrypt_eapol_key_data(const u8 *kek, u16 ver,
 }
 
 
-static void learn_kde_keys(struct wlantest_bss *bss, const u8 *buf, size_t len,
-			   const u8 *rsc)
+static void learn_kde_keys(struct wlantest_bss *bss, struct wlantest_sta *sta,
+			   const u8 *buf, size_t len, const u8 *rsc)
 {
 	struct wpa_eapol_ie_parse ie;
 
@@ -361,7 +361,9 @@ static void learn_kde_keys(struct wlantest_bss *bss, const u8 *buf, size_t len,
 			wpa_hexdump(MSG_DEBUG, "GTK", ie.gtk + 2,
 				    ie.gtk_len - 2);
 			bss->gtk_len[id] = ie.gtk_len - 2;
+			sta->gtk_len = ie.gtk_len - 2;
 			os_memcpy(bss->gtk[id], ie.gtk + 2, ie.gtk_len - 2);
+			os_memcpy(sta->gtk, ie.gtk + 2, ie.gtk_len - 2);
 			bss->rsc[id][0] = rsc[5];
 			bss->rsc[id][1] = rsc[4];
 			bss->rsc[id][2] = rsc[3];
@@ -369,6 +371,7 @@ static void learn_kde_keys(struct wlantest_bss *bss, const u8 *buf, size_t len,
 			bss->rsc[id][4] = rsc[1];
 			bss->rsc[id][5] = rsc[0];
 			bss->gtk_idx = id;
+			sta->gtk_idx = id;
 			wpa_hexdump(MSG_DEBUG, "RSC", bss->rsc[id], 6);
 		} else {
 			wpa_printf(MSG_INFO, "Invalid GTK KDE length %u",
@@ -561,7 +564,7 @@ static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
 			    bss->rsnie[0] ? 2 + bss->rsnie[1] : 0);
 	}
 
-	learn_kde_keys(bss, decrypted, decrypted_len, hdr->key_rsc);
+	learn_kde_keys(bss, sta, decrypted, decrypted_len, hdr->key_rsc);
 	os_free(decrypted_buf);
 }
 
@@ -711,7 +714,8 @@ static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
 				     decrypted, plain_len);
 	}
 	if (sta->proto & WPA_PROTO_RSN)
-		learn_kde_keys(bss, decrypted, decrypted_len, hdr->key_rsc);
+		learn_kde_keys(bss, sta, decrypted, decrypted_len,
+			       hdr->key_rsc);
 	else {
 		int klen = bss->group_cipher == WPA_CIPHER_TKIP ? 32 : 16;
 		if (decrypted_len == klen) {

wlantest/wlantest.h

@@ -93,6 +93,10 @@ struct wlantest_sta {
 
 	int pwrmgt;
 	int pspoll;
+
+	u8 gtk[32];
+	size_t gtk_len;
+	int gtk_idx;
 };
 
 struct wlantest_tdls {

wlantest/wlantest_cli.c

@@ -1226,6 +1226,7 @@ static const struct sta_infos sta_infos[] = {
 	{ "key_mgmt", WLANTEST_STA_INFO_KEY_MGMT },
 	{ "rsn_capab", WLANTEST_STA_INFO_RSN_CAPAB },
 	{ "state", WLANTEST_STA_INFO_STATE },
+	{ "gtk", WLANTEST_STA_INFO_GTK },
 	{ NULL, 0 }
 };
 

wlantest/wlantest_ctrl.h

@@ -157,6 +157,7 @@ enum wlantest_sta_info {
 	WLANTEST_STA_INFO_KEY_MGMT,
 	WLANTEST_STA_INFO_RSN_CAPAB,
 	WLANTEST_STA_INFO_STATE,
+	WLANTEST_STA_INFO_GTK,
 };
 
 enum wlantest_bss_info {