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/*
* Copyright (C) 2000-2012 Free Software Foundation, Inc.
*
* Author: 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 "gnutls_errors.h"
#include "debug.h"
#include <gnutls_session_pack.h>
#include <gnutls_datum.h>
/**
* gnutls_session_get_data:
* @session: is a #gnutls_session_t structure.
* @session_data: is a pointer to space to hold the session.
* @session_data_size: is the session_data's size, or it will be set by the function.
*
* Returns all session parameters needed to be stored to support resumption.
* The client should call this, and store the returned session data. A session
* may be resumed later by calling gnutls_session_set_data().
* This function must be called after a successful handshake.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int
gnutls_session_get_data(gnutls_session_t session,
void *session_data, size_t * session_data_size)
{
gnutls_datum_t psession;
int ret;
if (session->internals.resumable == RESUME_FALSE)
return GNUTLS_E_INVALID_SESSION;
psession.data = session_data;
ret = _gnutls_session_pack(session, &psession);
if (ret < 0) {
gnutls_assert();
return ret;
}
if (psession.size > *session_data_size) {
*session_data_size = psession.size;
ret = GNUTLS_E_SHORT_MEMORY_BUFFER;
goto error;
}
*session_data_size = psession.size;
if (session_data != NULL)
memcpy(session_data, psession.data, psession.size);
ret = 0;
error:
_gnutls_free_datum(&psession);
return ret;
}
/**
* gnutls_session_get_data2:
* @session: is a #gnutls_session_t structure.
* @data: is a pointer to a datum that will hold the session.
*
* Returns all session parameters needed to be stored to support resumption.
* The client should call this, and store the returned session data. A session
* may be resumed later by calling gnutls_session_set_data().
* This function must be called after a successful handshake.
* The returned @data are allocated and must be released using gnutls_free().
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int
gnutls_session_get_data2(gnutls_session_t session, gnutls_datum_t * data)
{
int ret;
if (data == NULL) {
return GNUTLS_E_INVALID_REQUEST;
}
if (session->internals.resumable == RESUME_FALSE)
return GNUTLS_E_INVALID_SESSION;
ret = _gnutls_session_pack(session, data);
if (ret < 0) {
gnutls_assert();
return ret;
}
return 0;
}
/**
* gnutls_session_get_id:
* @session: is a #gnutls_session_t structure.
* @session_id: is a pointer to space to hold the session id.
* @session_id_size: initially should contain the maximum @session_id size and will be updated.
*
* Returns the current session ID. This can be used if you want to
* check if the next session you tried to resume was actually
* resumed. That is because resumed sessions share the same session ID
* with the original session.
*
* The session ID is selected by the server, that identify the
* current session. In TLS 1.0 and SSL 3.0 session id is always less
* than 32 bytes.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int
gnutls_session_get_id(gnutls_session_t session,
void *session_id, size_t * session_id_size)
{
size_t given_session_id_size = *session_id_size;
*session_id_size = session->security_parameters.session_id_size;
/* just return the session size */
if (session_id == NULL) {
return 0;
}
if (given_session_id_size <
session->security_parameters.session_id_size) {
return GNUTLS_E_SHORT_MEMORY_BUFFER;
}
memcpy(session_id, &session->security_parameters.session_id,
*session_id_size);
return 0;
}
/**
* gnutls_session_get_id2:
* @session: is a #gnutls_session_t structure.
* @session_id: will point to the session ID.
*
* Returns the current session ID. The returned data should be
* treated as constant.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
*
* Since: 3.1.4
**/
int
gnutls_session_get_id2(gnutls_session_t session,
gnutls_datum_t * session_id)
{
session_id->size = session->security_parameters.session_id_size;
session_id->data = session->security_parameters.session_id;
return 0;
}
/**
* gnutls_session_set_data:
* @session: is a #gnutls_session_t structure.
* @session_data: is a pointer to space to hold the session.
* @session_data_size: is the session's size
*
* Sets all session parameters, in order to resume a previously
* established session. The session data given must be the one
* returned by gnutls_session_get_data(). This function should be
* called before gnutls_handshake().
*
* Keep in mind that session resuming is advisory. The server may
* choose not to resume the session, thus a full handshake will be
* performed.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int
gnutls_session_set_data(gnutls_session_t session,
const void *session_data, size_t session_data_size)
{
int ret;
gnutls_datum_t psession;
psession.data = (uint8_t *) session_data;
psession.size = session_data_size;
if (session_data == NULL || session_data_size == 0) {
gnutls_assert();
return GNUTLS_E_INVALID_REQUEST;
}
ret = _gnutls_session_unpack(session, &psession);
if (ret < 0) {
gnutls_assert();
return ret;
}
session->internals.resumption_requested = 1;
return 0;
}
/**
* gnutls_session_force_valid:
* @session: is a #gnutls_session_t structure.
*
* Clears the invalid flag in a session. That means
* that sessions were corrupt or invalid data were received
* can be re-used. Use only when debugging or experimenting
* with the TLS protocol. Should not be used in typical
* applications.
*
**/
void gnutls_session_force_valid(gnutls_session_t session)
{
session->internals.invalid_connection = 0;
}
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