early-access version 1255

externals/libressl/ssl/tls13_handshake_msg.c

@@ -0,0 +1,194 @@
+/* $OpenBSD: tls13_handshake_msg.c,v 1.2 2019/11/20 16:21:20 beck Exp $ */
+/*
+ * Copyright (c) 2018, 2019 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "bytestring.h"
+#include "ssl_locl.h"
+#include "tls13_internal.h"
+
+#define TLS13_HANDSHAKE_MSG_HEADER_LEN	4
+#define TLS13_HANDSHAKE_MSG_INITIAL_LEN	256
+#define TLS13_HANDSHAKE_MSG_MAX_LEN	(256 * 1024)
+
+struct tls13_handshake_msg {
+	uint8_t msg_type;
+	uint32_t msg_len;
+	uint8_t *data;
+	size_t data_len;
+
+	struct tls13_buffer *buf;
+	CBS cbs;
+	CBB cbb;
+};
+
+struct tls13_handshake_msg *
+tls13_handshake_msg_new()
+{
+	struct tls13_handshake_msg *msg = NULL;
+
+	if ((msg = calloc(1, sizeof(struct tls13_handshake_msg))) == NULL)
+		goto err;
+	if ((msg->buf = tls13_buffer_new(0)) == NULL)
+		goto err;
+
+	return msg;
+
+ err:
+	tls13_handshake_msg_free(msg);
+
+	return NULL;
+}
+
+void
+tls13_handshake_msg_free(struct tls13_handshake_msg *msg)
+{
+	if (msg == NULL)
+		return;
+
+	tls13_buffer_free(msg->buf);
+
+	CBB_cleanup(&msg->cbb);
+
+	freezero(msg->data, msg->data_len);
+	freezero(msg, sizeof(struct tls13_handshake_msg));
+}
+
+void
+tls13_handshake_msg_data(struct tls13_handshake_msg *msg, CBS *cbs)
+{
+	CBS_init(cbs, msg->data, msg->data_len);
+}
+
+int
+tls13_handshake_msg_set_buffer(struct tls13_handshake_msg *msg, CBS *cbs)
+{
+	return tls13_buffer_set_data(msg->buf, cbs);
+}
+
+uint8_t
+tls13_handshake_msg_type(struct tls13_handshake_msg *msg)
+{
+	return msg->msg_type;
+}
+
+int
+tls13_handshake_msg_content(struct tls13_handshake_msg *msg, CBS *cbs)
+{
+	tls13_handshake_msg_data(msg, cbs);
+
+	return CBS_skip(cbs, TLS13_HANDSHAKE_MSG_HEADER_LEN);
+}
+
+int
+tls13_handshake_msg_start(struct tls13_handshake_msg *msg, CBB *body,
+    uint8_t msg_type)
+{
+	if (!CBB_init(&msg->cbb, TLS13_HANDSHAKE_MSG_INITIAL_LEN))
+		return 0;
+	if (!CBB_add_u8(&msg->cbb, msg_type))
+		return 0;
+	if (!CBB_add_u24_length_prefixed(&msg->cbb, body))
+		return 0;
+
+	return 1;
+}
+
+int
+tls13_handshake_msg_finish(struct tls13_handshake_msg *msg)
+{
+	if (!CBB_finish(&msg->cbb, &msg->data, &msg->data_len))
+		return 0;
+
+	CBS_init(&msg->cbs, msg->data, msg->data_len);
+
+	return 1;
+}
+
+static ssize_t
+tls13_handshake_msg_read_cb(void *buf, size_t n, void *cb_arg)
+{
+	struct tls13_record_layer *rl = cb_arg;
+
+	return tls13_read_handshake_data(rl, buf, n);
+}
+
+int
+tls13_handshake_msg_recv(struct tls13_handshake_msg *msg,
+    struct tls13_record_layer *rl)
+{
+	uint8_t msg_type;
+	uint32_t msg_len;
+	CBS cbs;
+	int ret;
+
+	if (msg->data != NULL)
+		return TLS13_IO_FAILURE;
+
+	if (msg->msg_type == 0) {
+		if ((ret = tls13_buffer_extend(msg->buf,
+		    TLS13_HANDSHAKE_MSG_HEADER_LEN,
+		    tls13_handshake_msg_read_cb, rl)) <= 0)
+			return ret;
+
+		tls13_buffer_cbs(msg->buf, &cbs);
+
+		if (!CBS_get_u8(&cbs, &msg_type))
+			return TLS13_IO_FAILURE;
+		if (!CBS_get_u24(&cbs, &msg_len))
+			return TLS13_IO_FAILURE;
+
+		/* XXX - do we want to make this variable on message type? */
+		if (msg_len > TLS13_HANDSHAKE_MSG_MAX_LEN)
+			return TLS13_IO_FAILURE;
+
+		msg->msg_type = msg_type;
+		msg->msg_len = msg_len;
+	}
+
+	if ((ret = tls13_buffer_extend(msg->buf,
+	    TLS13_HANDSHAKE_MSG_HEADER_LEN + msg->msg_len,
+	    tls13_handshake_msg_read_cb, rl)) <= 0)
+		return ret;
+
+	if (!tls13_buffer_finish(msg->buf, &msg->data, &msg->data_len))
+		return TLS13_IO_FAILURE;
+
+	return TLS13_IO_SUCCESS;
+}
+
+int
+tls13_handshake_msg_send(struct tls13_handshake_msg *msg,
+    struct tls13_record_layer *rl)
+{
+	ssize_t ret;
+
+	if (msg->data == NULL)
+		return TLS13_IO_FAILURE;
+
+	if (CBS_len(&msg->cbs) == 0)
+		return TLS13_IO_FAILURE;
+
+	while (CBS_len(&msg->cbs) > 0) {
+		if ((ret = tls13_write_handshake_data(rl, CBS_data(&msg->cbs),
+		    CBS_len(&msg->cbs))) <= 0)
+			return ret;
+
+		if (!CBS_skip(&msg->cbs, ret))
+			return TLS13_IO_FAILURE;
+	}
+
+	return TLS13_IO_SUCCESS;
+}