EAP-TLS/PEAP/TTLS/FAST: Move more towards using struct wpabuf

The EAP-TLS-based helper functions can easily use struct wpabuf in more
places, so continue cleanup in that direction by replacing separate
pointer and length arguments with a single struct wpabuf argument.

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

src/eap_peer/eap_fast.c

@@ -1528,6 +1528,7 @@ static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
 	struct wpabuf *resp;
 	const u8 *pos;
 	struct eap_fast_data *data = priv;
+	struct wpabuf msg;
 
 	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_FAST, ret,
 					reqData, &left, &flags);
@@ -1544,12 +1545,12 @@ static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
 		left = 0; /* A-ID is not used in further packet processing */
 	}
 
+	wpabuf_set(&msg, pos, left);
+
 	resp = NULL;
 	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
 	    !data->resuming) {
 		/* Process tunneled (encrypted) phase 2 data. */
-		struct wpabuf msg;
-		wpabuf_set(&msg, pos, left);
 		res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
 		if (res < 0) {
 			ret->methodState = METHOD_DONE;
@@ -1564,8 +1565,8 @@ static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
 		/* Continue processing TLS handshake (phase 1). */
 		res = eap_peer_tls_process_helper(sm, &data->ssl,
 						  EAP_TYPE_FAST,
-						  data->fast_version, id, pos,
-						  left, &resp);
+						  data->fast_version, id, &msg,
+						  &resp);
 
 		if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 			char cipher[80];
@@ -1589,14 +1590,12 @@ static struct wpabuf * eap_fast_process(struct eap_sm *sm, void *priv,
 		}
 
 		if (res == 2) {
-			struct wpabuf msg;
 			/*
 			 * Application data included in the handshake message.
 			 */
 			wpabuf_free(data->pending_phase2_req);
 			data->pending_phase2_req = resp;
 			resp = NULL;
-			wpabuf_set(&msg, pos, left);
 			res = eap_fast_decrypt(sm, data, ret, id, &msg, &resp);
 		}
 	}

src/eap_peer/eap_peap.c

@@ -968,6 +968,7 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 	struct wpabuf *resp;
 	const u8 *pos;
 	struct eap_peap_data *data = priv;
+	struct wpabuf msg;
 
 	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
 					reqData, &left, &flags);
@@ -998,17 +999,17 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 			   * should always be, anyway */
 	}
 
+	wpabuf_set(&msg, pos, left);
+
 	resp = NULL;
 	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
 	    !data->resuming) {
-		struct wpabuf msg;
-		wpabuf_set(&msg, pos, left);
 		res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
 	} else {
 		res = eap_peer_tls_process_helper(sm, &data->ssl,
 						  EAP_TYPE_PEAP,
-						  data->peap_version, id, pos,
-						  left, &resp);
+						  data->peap_version, id, &msg,
+						  &resp);
 
 		if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 			char *label;
@@ -1077,14 +1078,12 @@ static struct wpabuf * eap_peap_process(struct eap_sm *sm, void *priv,
 		}
 
 		if (res == 2) {
-			struct wpabuf msg;
 			/*
 			 * Application data included in the handshake message.
 			 */
 			wpabuf_free(data->pending_phase2_req);
 			data->pending_phase2_req = resp;
 			resp = NULL;
-			wpabuf_set(&msg, pos, left);
 			res = eap_peap_decrypt(sm, data, ret, req, &msg,
 					       &resp);
 		}

src/eap_peer/eap_tls.c

@@ -228,6 +228,7 @@ static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
 	u8 flags, id;
 	const u8 *pos;
 	struct eap_tls_data *data = priv;
+	struct wpabuf msg;
 
 	pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
 					reqData, &left, &flags);
@@ -242,8 +243,9 @@ static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
 	}
 
 	resp = NULL;
+	wpabuf_set(&msg, pos, left);
 	res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
-					  id, pos, left, &resp);
+					  id, &msg, &resp);
 
 	if (res < 0) {
 		return eap_tls_failure(sm, data, ret, res, resp, id);

src/eap_peer/eap_tls_common.c

@@ -477,22 +477,19 @@ static const struct wpabuf * eap_peer_tls_data_reassemble(
  * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
  * @data: Data for TLS processing
  * @in_data: Message received from the server
- * @in_len: Length of in_data
  * @out_data: Buffer for returning a pointer to application data (if available)
  * Returns: 0 on success, 1 if more input data is needed, 2 if application data
  * is available, -1 on failure
  */
 static int eap_tls_process_input(struct eap_sm *sm, struct eap_ssl_data *data,
-				 const u8 *in_data, size_t in_len,
+				 const struct wpabuf *in_data,
 				 struct wpabuf **out_data)
 {
 	const struct wpabuf *msg;
 	int need_more_input;
 	struct wpabuf *appl_data;
-	struct wpabuf buf;
 
-	wpabuf_set(&buf, in_data, in_len);
-	msg = eap_peer_tls_data_reassemble(data, &buf, &need_more_input);
+	msg = eap_peer_tls_data_reassemble(data, in_data, &need_more_input);
 	if (msg == NULL)
 		return need_more_input ? 1 : -1;
 
@@ -612,7 +609,6 @@ static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
  * @peap_version: Version number for EAP-PEAP/TTLS
  * @id: EAP identifier for the response
  * @in_data: Message received from the server
- * @in_len: Length of in_data
  * @out_data: Buffer for returning a pointer to the response message
  * Returns: 0 on success, 1 if more input data is needed, 2 if application data
  * is available, or -1 on failure
@@ -635,14 +631,15 @@ static int eap_tls_process_output(struct eap_ssl_data *data, EapType eap_type,
  */
 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 				EapType eap_type, int peap_version,
-				u8 id, const u8 *in_data, size_t in_len,
+				u8 id, const struct wpabuf *in_data,
 				struct wpabuf **out_data)
 {
 	int ret = 0;
 
 	*out_data = NULL;
 
-	if (data->tls_out && wpabuf_len(data->tls_out) > 0 && in_len > 0) {
+	if (data->tls_out && wpabuf_len(data->tls_out) > 0 &&
+	    wpabuf_len(in_data) > 0) {
 		wpa_printf(MSG_DEBUG, "SSL: Received non-ACK when output "
 			   "fragments are waiting to be sent out");
 		return -1;
@@ -653,8 +650,7 @@ int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 		 * No more data to send out - expect to receive more data from
 		 * the AS.
 		 */
-		int res = eap_tls_process_input(sm, data, in_data, in_len,
-						out_data);
+		int res = eap_tls_process_input(sm, data, in_data, out_data);
 		if (res) {
 			/*
 			 * Input processing failed (res = -1) or more data is

src/eap_peer/eap_tls_common.h

@@ -100,7 +100,7 @@ u8 * eap_peer_tls_derive_session_id(struct eap_sm *sm,
 				    size_t *len);
 int eap_peer_tls_process_helper(struct eap_sm *sm, struct eap_ssl_data *data,
 				EapType eap_type, int peap_version,
-				u8 id, const u8 *in_data, size_t in_len,
+				u8 id, const struct wpabuf *in_data,
 				struct wpabuf **out_data);
 struct wpabuf * eap_peer_tls_build_ack(u8 id, EapType eap_type,
 				       int peap_version);

src/eap_peer/eap_ttls.c

@@ -1385,14 +1385,14 @@ static int eap_ttls_process_handshake(struct eap_sm *sm,
 				      struct eap_ttls_data *data,
 				      struct eap_method_ret *ret,
 				      u8 identifier,
-				      const u8 *in_data, size_t in_len,
+				      const struct wpabuf *in_data,
 				      struct wpabuf **out_data)
 {
 	int res;
 
 	res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TTLS,
 					  data->ttls_version, identifier,
-					  in_data, in_len, out_data);
+					  in_data, out_data);
 
 	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
 		wpa_printf(MSG_DEBUG, "EAP-TTLS: TLS done, proceed to "
@@ -1419,15 +1419,13 @@ static int eap_ttls_process_handshake(struct eap_sm *sm,
 	}
 
 	if (res == 2) {
-		struct wpabuf msg;
 		/*
 		 * Application data included in the handshake message.
 		 */
 		wpabuf_free(data->pending_phase2_req);
 		data->pending_phase2_req = *out_data;
 		*out_data = NULL;
-		wpabuf_set(&msg, in_data, in_len);
-		res = eap_ttls_decrypt(sm, data, ret, identifier, &msg,
+		res = eap_ttls_decrypt(sm, data, ret, identifier, in_data,
 				       out_data);
 	}
 
@@ -1477,6 +1475,7 @@ static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
 	struct wpabuf *resp;
 	const u8 *pos;
 	struct eap_ttls_data *data = priv;
+	struct wpabuf msg;
 
 	pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TTLS, ret,
 					reqData, &left, &flags);
@@ -1497,15 +1496,15 @@ static struct wpabuf * eap_ttls_process(struct eap_sm *sm, void *priv,
 		left = 0;
 	}
 
+	wpabuf_set(&msg, pos, left);
+
 	resp = NULL;
 	if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
 	    !data->resuming) {
-		struct wpabuf msg;
-		wpabuf_set(&msg, pos, left);
 		res = eap_ttls_decrypt(sm, data, ret, id, &msg, &resp);
 	} else {
 		res = eap_ttls_process_handshake(sm, data, ret, id,
-						 pos, left, &resp);
+						 &msg, &resp);
 	}
 
 	eap_ttls_check_auth_status(sm, data, ret);