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#include "gnutls_int.h"
#include "handshake.h"
#include "handshake-msg.h"
#include "mbuffers.h"
#define CHECK_SIZE(ll) \
if ((session->internals.max_handshake_data_buffer_size > 0) && \
(((ll) + session->internals.handshake_hash_buffer.length) > \
session->internals.max_handshake_data_buffer_size)) { \
_gnutls_debug_log("Handshake buffer length is %u (max: %u)\n", (unsigned)((ll) + session->internals.handshake_hash_buffer.length), (unsigned)session->internals.max_handshake_data_buffer_size); \
return gnutls_assert_val(GNUTLS_E_HANDSHAKE_TOO_LARGE); \
}
struct handshake_msg_st
{
gnutls_handshake_description_t type;
size_t committed_bytes;
};
int _gnutls_handshake_msg_init(struct handshake_msg_st **out,
gnutls_handshake_description_t type,
gnutls_session_t session)
{
struct handshake_msg_st *hs = _gnutls_calloc(1, sizeof(struct handshake_msg_st));
hs->type = type;
*out = hs;
return GNUTLS_E_SUCCESS;
}
void _gnutls_handshake_msg_deinit(struct handshake_msg_st **hs)
{
gnutls_free(*hs);
*hs = NULL;
}
/* This function add the handshake headers and the
* handshake data to the handshake hash buffers. Needed
* for the finished messages calculations.
*/
int
_gnutls_handshake_hash_add_recvd(gnutls_session_t session,
gnutls_handshake_description_t recv_type,
uint8_t * header, uint16_t header_size,
uint8_t * dataptr, uint32_t datalen)
{
int ret;
const version_entry_st *vers = get_version(session);
if (unlikely(vers == NULL))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if ((vers->id != GNUTLS_DTLS0_9 &&
recv_type == GNUTLS_HANDSHAKE_HELLO_VERIFY_REQUEST) ||
recv_type == GNUTLS_HANDSHAKE_HELLO_REQUEST)
return 0;
CHECK_SIZE(header_size + datalen);
session->internals.handshake_hash_buffer_prev_len =
session->internals.handshake_hash_buffer.length;
if (vers->id != GNUTLS_DTLS0_9) {
ret =
_gnutls_buffer_append_data(&session->internals.
handshake_hash_buffer,
header, header_size);
if (ret < 0)
return gnutls_assert_val(ret);
}
if (datalen > 0) {
ret =
_gnutls_buffer_append_data(&session->internals.
handshake_hash_buffer,
dataptr, datalen);
if (ret < 0)
return gnutls_assert_val(ret);
}
/* save the size until client KX. That is because the TLS
* session hash is calculated up to this message.
*/
if (recv_type == GNUTLS_HANDSHAKE_CLIENT_KEY_EXCHANGE)
session->internals.handshake_hash_buffer_client_kx_len =
session->internals.handshake_hash_buffer.length;
if (recv_type == GNUTLS_HANDSHAKE_FINISHED && session->security_parameters.entity == GNUTLS_CLIENT)
session->internals.handshake_hash_buffer_server_finished_len =
session->internals.handshake_hash_buffer.length;
return 0;
}
/* This function will store the handshake message we sent.
*/
int
_gnutls_handshake_hash_add_sent(gnutls_session_t session,
gnutls_handshake_description_t type,
uint8_t * dataptr, uint32_t datalen)
{
int ret;
const version_entry_st *vers = get_version(session);
if (unlikely(vers == NULL))
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
/* We don't check for GNUTLS_HANDSHAKE_HELLO_VERIFY_REQUEST because it
* is not sent via that channel.
*/
if (type != GNUTLS_HANDSHAKE_HELLO_REQUEST) {
CHECK_SIZE(datalen);
if (vers->id == GNUTLS_DTLS0_9) {
/* Old DTLS doesn't include the header in the MAC */
if (datalen < 12) {
gnutls_assert();
return GNUTLS_E_INTERNAL_ERROR;
}
dataptr += 12;
datalen -= 12;
if (datalen == 0)
return 0;
}
ret =
_gnutls_buffer_append_data(&session->internals.
handshake_hash_buffer,
dataptr, datalen);
if (ret < 0)
return gnutls_assert_val(ret);
if (type == GNUTLS_HANDSHAKE_CLIENT_KEY_EXCHANGE)
session->internals.handshake_hash_buffer_client_kx_len =
session->internals.handshake_hash_buffer.length;
if (type == GNUTLS_HANDSHAKE_FINISHED && session->security_parameters.entity == GNUTLS_SERVER)
session->internals.handshake_hash_buffer_server_finished_len =
session->internals.handshake_hash_buffer.length;
return 0;
}
return 0;
}
static int
handshake_commit(gnutls_session_t session,
struct handshake_msg_st *hs,
uint8_t *data, uint32_t datasize,
size_t head_skip_bytes, size_t header_length)
{
int ret;
size_t to_commit, offset, prev_committed_bytes;
/* This message is not taken into account for the hash */
if (hs->type == GNUTLS_HANDSHAKE_HELLO_REQUEST)
return GNUTLS_E_SUCCESS;
prev_committed_bytes = hs->committed_bytes;
if (datasize > hs->committed_bytes) {
to_commit = datasize - hs->committed_bytes - head_skip_bytes;
offset = hs->committed_bytes + head_skip_bytes;
ret = _gnutls_handshake_hash_add_sent(session, hs->type,
data + offset,
to_commit);
if (ret < 0)
return gnutls_assert_val(ret);
hs->committed_bytes += to_commit;
}
if (hs->committed_bytes > prev_committed_bytes) {
/* Update type field */
session->internals.handshake_hash_buffer.data[0] = (uint8_t) hs->type;
/* Update size field */
_gnutls_write_uint24(hs->committed_bytes - header_length,
&session->internals.handshake_hash_buffer.data[1]);
}
return GNUTLS_E_SUCCESS;
}
int _gnutls_handshake_msg_commit_from_buffer(gnutls_session_t session,
struct handshake_msg_st *hs,
gnutls_buffer_st *buf,
size_t head_skip_bytes,
size_t header_length)
{
uint8_t *data;
uint32_t datasize;
if (!hs || !buf)
return GNUTLS_E_INTERNAL_ERROR;
data = buf->data;
datasize = buf->length;
return handshake_commit(session, hs,
data, datasize,
head_skip_bytes, header_length);
}
int _gnutls_handshake_msg_commit_from_mbuffer(gnutls_session_t session,
struct handshake_msg_st *hs,
mbuffer_st *bufel,
size_t head_skip_bytes, size_t header_length)
{
uint8_t *data;
uint32_t datasize;
if (!hs || !bufel)
return GNUTLS_E_INTERNAL_ERROR;
data = _mbuffer_get_uhead_ptr(bufel);
datasize = _mbuffer_get_udata_size(bufel) + _mbuffer_get_uhead_size(bufel);
return handshake_commit(session, hs,
data, datasize,
head_skip_bytes, header_length);
}
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