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/*
* Copyright (C) 2017-2018 Free Software Foundation, Inc.
* Copyright (C) 2018 Red Hat, Inc.
*
* Author: Ander Juaristi, Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
#include "gnutls_int.h"
#include "tls13/psk_ext_parser.h"
/* Returns GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE when no identities
* are present, or >= 0, on success.
*/
int _gnutls13_psk_ext_parser_init(psk_ext_parser_st *p,
const unsigned char *data, size_t _len)
{
uint16_t identities_len;
ssize_t len = _len;
if (!p || !data || !len)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
memset(p, 0, sizeof(*p));
DECR_LEN(len, 2);
identities_len = _gnutls_read_uint16(data);
data += 2;
if (identities_len == 0)
return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
p->id_len = identities_len;
p->data = (unsigned char *) data;
p->len = len;
DECR_LEN(len, p->id_len);
data += p->id_len;
DECR_LEN(len, 2);
p->binder_len = _gnutls_read_uint16(data);
p->binder_data = p->data + p->id_len + 2;
DECR_LEN(len, p->binder_len);
return 0;
}
int _gnutls13_psk_ext_parser_next_psk(psk_ext_parser_st *p, struct psk_st *psk)
{
if (p->id_read >= p->id_len)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
/* Read a PskIdentity structure */
DECR_LEN(p->len, 2);
psk->identity.size = _gnutls_read_uint16(p->data);
if (psk->identity.size == 0)
return GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE;
p->data += 2;
p->id_read += 2;
psk->identity.data = (void*)p->data;
DECR_LEN(p->len, psk->identity.size);
p->data += psk->identity.size;
p->id_read += psk->identity.size;
DECR_LEN(p->len, 4);
psk->ob_ticket_age = _gnutls_read_uint32(p->data);
p->data += 4;
p->id_read += 4;
return p->next_index++;
}
/* Output is a pointer to data, which shouldn't be de-allocated. */
int _gnutls13_psk_ext_parser_find_binder(psk_ext_parser_st *p, int psk_index,
gnutls_datum_t *binder_out)
{
uint8_t binder_len;
int cur_index = 0, binder_found = 0;
ssize_t len;
const uint8_t *data;
ssize_t read_data = 0;
if (p == NULL || psk_index < 0 || binder_out == NULL)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
if (p->id_len == 0)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
len = p->binder_len;
data = p->binder_data;
if (len == 0)
return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
/* Start traversing the binders */
while (!binder_found && len > 0) {
DECR_LEN(len, 1);
binder_len = *(data);
if (binder_len == 0)
return gnutls_assert_val(GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER);
data++;
read_data++;
if (cur_index == psk_index) {
/* We found the binder with the supplied index */
DECR_LEN(len, binder_len);
binder_out->data = (void*)data;
binder_out->size = binder_len;
data += binder_len;
read_data += binder_len;
binder_found = 1;
} else {
/* Not our binder - continue to the next one */
DECR_LEN(len, binder_len);
data += binder_len;
read_data += binder_len;
cur_index++;
}
}
if (binder_found)
return 0;
else
return gnutls_assert_val(GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE);
}
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