DPP2: Add an automatic peer_bi entry for CSR matching if needed

This allows the DPP_CA_SET command to be targeting a specific DPP-CST
event in cases where the Configurator did not receive the bootstrapping
information for the peer.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>

src/common/dpp.c

@@ -1293,9 +1293,14 @@ void dpp_auth_deinit(struct dpp_authentication *auth)
 	wpabuf_free(auth->cacert);
 	wpabuf_free(auth->certbag);
 	os_free(auth->trusted_eap_server_name);
+	wpabuf_free(auth->conf_resp_tcp);
 #endif /* CONFIG_DPP2 */
 	wpabuf_free(auth->net_access_key);
 	dpp_bootstrap_info_free(auth->tmp_own_bi);
+	if (auth->tmp_peer_bi) {
+		dl_list_del(&auth->tmp_peer_bi->list);
+		dpp_bootstrap_info_free(auth->tmp_peer_bi);
+	}
 #ifdef CONFIG_TESTING_OPTIONS
 	os_free(auth->config_obj_override);
 	os_free(auth->discovery_override);
@@ -2044,6 +2049,7 @@ dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
 	cert_req = json_get_member_base64(root, "pkcs10");
 	if (cert_req) {
 		char *txt;
+		int id;
 
 		wpa_hexdump_buf(MSG_DEBUG, "DPP: CertificateRequest", cert_req);
 		if (dpp_validate_csr(auth, cert_req) < 0) {
@@ -2051,13 +2057,31 @@ dpp_conf_req_rx(struct dpp_authentication *auth, const u8 *attr_start,
 			auth->force_conf_resp_status = DPP_STATUS_CSR_BAD;
 			goto cont;
 		}
+
+		if (auth->peer_bi) {
+			id = auth->peer_bi->id;
+		} else if (auth->tmp_peer_bi) {
+			id = auth->tmp_peer_bi->id;
+		} else {
+			struct dpp_bootstrap_info *bi;
+
+			bi = os_zalloc(sizeof(*bi));
+			if (!bi)
+				goto fail;
+			bi->id = dpp_next_id(auth->global);
+			dl_list_add(&auth->global->bootstrap, &bi->list);
+			auth->tmp_peer_bi = bi;
+			id = bi->id;
+		}
+
 		wpa_printf(MSG_DEBUG, "DPP: CSR is valid - forward to CA/RA");
 		txt = base64_encode_no_lf(wpabuf_head(cert_req),
 					  wpabuf_len(cert_req), NULL);
 		if (!txt)
 			goto fail;
+
 		wpa_msg(auth->msg_ctx, MSG_INFO, DPP_EVENT_CSR "peer=%d csr=%s",
-			auth->peer_bi ? (int) auth->peer_bi->id : -1, txt);
+			id, txt);
 		os_free(txt);
 		auth->waiting_csr = false;
 		auth->waiting_cert = true;

src/common/dpp.h

@@ -244,6 +244,7 @@ struct dpp_authentication {
 	struct dpp_bootstrap_info *peer_bi;
 	struct dpp_bootstrap_info *own_bi;
 	struct dpp_bootstrap_info *tmp_own_bi;
+	struct dpp_bootstrap_info *tmp_peer_bi;
 	u8 waiting_pubkey_hash[SHA256_MAC_LEN];
 	int response_pending;
 	int reconfig;
@@ -298,6 +299,7 @@ struct dpp_authentication {
 	bool reconfig_success;
 	struct wpabuf *conf_req;
 	const struct wpabuf *conf_resp; /* owned by GAS server */
+	struct wpabuf *conf_resp_tcp;
 	struct dpp_configuration *conf_ap;
 	struct dpp_configuration *conf2_ap;
 	struct dpp_configuration *conf_sta;
@@ -660,6 +662,8 @@ int dpp_relay_rx_gas_req(struct dpp_global *dpp, const u8 *src, const u8 *data,
 int dpp_controller_start(struct dpp_global *dpp,
 			 struct dpp_controller_config *config);
 void dpp_controller_stop(struct dpp_global *dpp);
+struct dpp_authentication * dpp_controller_get_auth(struct dpp_global *dpp,
+						    unsigned int id);
 int dpp_tcp_init(struct dpp_global *dpp, struct dpp_authentication *auth,
 		 const struct hostapd_ip_addr *addr, int port,
 		 const char *name);

src/common/dpp_tcp.c

@@ -40,7 +40,6 @@ struct dpp_connection {
 	unsigned int on_tcp_tx_complete_auth_ok:1;
 	unsigned int gas_comeback_in_progress:1;
 	u8 gas_dialog_token;
-	struct wpabuf *gas_resp;
 	char *name;
 };
 
@@ -91,7 +90,6 @@ static void dpp_connection_free(struct dpp_connection *conn)
 	eloop_cancel_timeout(dpp_tcp_gas_query_comeback, conn, NULL);
 	wpabuf_free(conn->msg);
 	wpabuf_free(conn->msg_out);
-	wpabuf_free(conn->gas_resp);
 	dpp_auth_deinit(conn->auth);
 	os_free(conn->name);
 	os_free(conn);
@@ -1148,7 +1146,7 @@ static int dpp_controller_rx_gas_comeback_req(struct dpp_connection *conn,
 		return -1;
 	}
 
-	if (!conn->gas_resp) {
+	if (!auth->conf_resp_tcp) {
 		wpa_printf(MSG_DEBUG, "DPP: Certificate not yet ready");
 		return dpp_tcp_send_comeback_delay(conn,
 						   WLAN_PA_GAS_COMEBACK_RESP);
@@ -1156,8 +1154,8 @@ static int dpp_controller_rx_gas_comeback_req(struct dpp_connection *conn,
 
 	wpa_printf(MSG_DEBUG,
 		   "DPP: Configuration response is ready to be sent out");
-	resp = conn->gas_resp;
-	conn->gas_resp = NULL;
+	resp = auth->conf_resp_tcp;
+	auth->conf_resp_tcp = NULL;
 	return dpp_tcp_send_gas_resp(conn, WLAN_PA_GAS_COMEBACK_RESP, resp);
 }
 
@@ -1665,6 +1663,28 @@ void dpp_controller_stop(struct dpp_global *dpp)
 }
 
 
+struct dpp_authentication * dpp_controller_get_auth(struct dpp_global *dpp,
+						    unsigned int id)
+{
+	struct dpp_controller *ctrl = dpp->controller;
+	struct dpp_connection *conn;
+
+	if (!ctrl)
+		return NULL;
+
+	dl_list_for_each(conn, &ctrl->conn, struct dpp_connection, list) {
+		struct dpp_authentication *auth = conn->auth;
+
+		if (auth &&
+		    ((auth->peer_bi && auth->peer_bi->id == id) ||
+		     (auth->tmp_peer_bi && auth->tmp_peer_bi->id == id)))
+			return auth;
+	}
+
+	return NULL;
+}
+
+
 void dpp_tcp_init_flush(struct dpp_global *dpp)
 {
 	struct dpp_connection *conn, *tmp;

wpa_supplicant/dpp_supplicant.c

@@ -3632,7 +3632,7 @@ int wpas_dpp_reconfig(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 
 
 static int wpas_dpp_build_conf_resp(struct wpa_supplicant *wpa_s,
-				    struct dpp_authentication *auth)
+				    struct dpp_authentication *auth, bool tcp)
 {
 	struct wpabuf *resp;
 
@@ -3640,6 +3640,12 @@ static int wpas_dpp_build_conf_resp(struct wpa_supplicant *wpa_s,
 				   auth->e_netrole, true);
 	if (!resp)
 		return -1;
+
+	if (tcp) {
+		auth->conf_resp_tcp = resp;
+		return 0;
+	}
+
 	if (gas_server_set_resp(wpa_s->gas_server, auth->cert_resp_ctx,
 				resp) < 0) {
 		wpa_printf(MSG_DEBUG,
@@ -3654,12 +3660,23 @@ static int wpas_dpp_build_conf_resp(struct wpa_supplicant *wpa_s,
 
 int wpas_dpp_ca_set(struct wpa_supplicant *wpa_s, const char *cmd)
 {
-	int peer;
+	int peer = -1;
 	const char *pos, *value;
 	struct dpp_authentication *auth = wpa_s->dpp_auth;
 	u8 *bin;
 	size_t bin_len;
 	struct wpabuf *buf;
+	bool tcp = false;
+
+	pos = os_strstr(cmd, " peer=");
+	if (pos) {
+		peer = atoi(pos + 6);
+		if (!auth || !auth->waiting_cert ||
+		    (unsigned int) peer != auth->peer_bi->id) {
+			auth = dpp_controller_get_auth(wpa_s->dpp, peer);
+			tcp = true;
+		}
+	}
 
 	if (!auth || !auth->waiting_cert) {
 		wpa_printf(MSG_DEBUG,
@@ -3667,15 +3684,14 @@ int wpas_dpp_ca_set(struct wpa_supplicant *wpa_s, const char *cmd)
 		return -1;
 	}
 
-	pos = os_strstr(cmd, " peer=");
-	if (pos) {
-		peer = atoi(pos + 6);
-		if (!auth->peer_bi ||
-		    (unsigned int) peer != auth->peer_bi->id) {
+	if (peer >= 0 &&
+	    (!auth->peer_bi ||
+	     (unsigned int) peer != auth->peer_bi->id) &&
+	    (!auth->tmp_peer_bi ||
+	     (unsigned int) peer != auth->tmp_peer_bi->id)) {
 		wpa_printf(MSG_DEBUG, "DPP: Peer mismatch");
 		return -1;
 	}
-	}
 
 	pos = os_strstr(cmd, " value=");
 	if (!pos)
@@ -3689,7 +3705,7 @@ int wpas_dpp_ca_set(struct wpa_supplicant *wpa_s, const char *cmd)
 
 	if (os_strncmp(pos, "status ", 7) == 0) {
 		auth->force_conf_resp_status = atoi(value);
-		return wpas_dpp_build_conf_resp(wpa_s, auth);
+		return wpas_dpp_build_conf_resp(wpa_s, auth, tcp);
 	}
 
 	if (os_strncmp(pos, "trustedEapServerName ", 21) == 0) {
@@ -3713,7 +3729,7 @@ int wpas_dpp_ca_set(struct wpa_supplicant *wpa_s, const char *cmd)
 	if (os_strncmp(pos, "certBag ", 8) == 0) {
 		wpabuf_free(auth->certbag);
 		auth->certbag = buf;
-		return wpas_dpp_build_conf_resp(wpa_s, auth);
+		return wpas_dpp_build_conf_resp(wpa_s, auth, tcp);
 	}
 
 	wpabuf_free(buf);