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/* $OpenBSD: tls13_handshake_msg.c,v 1.7 2024/02/04 20:50:23 tb 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 "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 tls_buffer *buf;
CBS cbs;
CBB cbb;
};
struct tls13_handshake_msg *
tls13_handshake_msg_new(void)
{
struct tls13_handshake_msg *msg = NULL;
if ((msg = calloc(1, sizeof(struct tls13_handshake_msg))) == NULL)
goto err;
if ((msg->buf = tls_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;
tls_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);
}
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 = tls_buffer_extend(msg->buf,
TLS13_HANDSHAKE_MSG_HEADER_LEN,
tls13_handshake_msg_read_cb, rl)) <= 0)
return ret;
if (!tls_buffer_data(msg->buf, &cbs))
return TLS13_IO_FAILURE;
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 = tls_buffer_extend(msg->buf,
TLS13_HANDSHAKE_MSG_HEADER_LEN + msg->msg_len,
tls13_handshake_msg_read_cb, rl)) <= 0)
return ret;
if (!tls_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;
}
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