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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Secure Component */
/** */
/** Datagram Transport Layer Security (DTLS) */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_dtls.h"
#ifdef NX_SECURE_ENABLE_DTLS
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* nx_secure_dtls_session_cache_delete PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes DTLS session with specific IP address and */
/* port. */
/* */
/* INPUT */
/* */
/* dtls_server DTLS server control block */
/* ip_address IP address to match */
/* remote_port Remote port to match */
/* local_port Local port to match */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_dtls_session_reset Reset DTLS session */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
VOID nx_secure_dtls_session_cache_delete(NX_SECURE_DTLS_SERVER *dtls_server, NXD_ADDRESS *ip_address, UINT remote_port, UINT local_port)
{
NX_SECURE_DTLS_SESSION *session_array;
UINT num_sessions;
UINT i;
/* Get our session cache information from the DTLS server instance. */
num_sessions = dtls_server->nx_dtls_server_sessions_count;
session_array = dtls_server->nx_dtls_server_sessions;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* Reset all entries with matching IP address and port. */
for (i = 0; i < num_sessions; ++i)
{
/* If the IP address and port match, then reset the entry. */
if (session_array[i].nx_secure_dtls_remote_port != remote_port ||
session_array[i].nx_secure_dtls_local_port != local_port)
{
continue;
}
if (session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_version !=
ip_address -> nxd_ip_version)
{
continue;
}
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V4)
{
if (session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v4 !=
ip_address -> nxd_ip_address.v4)
{
continue;
}
}
#ifdef FEATURE_NX_IPV6
else if ((session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[0] != ip_address -> nxd_ip_address.v6[0]) ||
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[1] != ip_address -> nxd_ip_address.v6[1]) ||
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[2] != ip_address -> nxd_ip_address.v6[2]) ||
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[3] != ip_address -> nxd_ip_address.v6[3]))
{
continue;
}
#endif /* FEATURE_NX_IPV6 */
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
_nx_secure_dtls_session_reset(&session_array[i]);
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* nx_secure_dtls_session_cache_get_new PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function allows the DTLS implementation to associate a DTLS */
/* session control block with a particular IP Address and Port, */
/* enabling multiple DTLS sessions on a single UDP socket. */
/* */
/* INPUT */
/* */
/* dtls_server DTLS server control block */
/* dtls_session Returned DTLS session */
/* ip_address IP address */
/* remote_port Remote port */
/* local_port Local port */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_receive_callback DTLS receive callback function*/
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT nx_secure_dtls_session_cache_get_new(NX_SECURE_DTLS_SERVER *dtls_server, NX_SECURE_DTLS_SESSION **dtls_session, NXD_ADDRESS *ip_address, UINT remote_port, UINT local_port)
{
NX_SECURE_DTLS_SESSION *session_array;
UINT num_sessions;
UINT i;
/* Get our session cache information from the DTLS server instance. */
num_sessions = dtls_server->nx_dtls_server_sessions_count;
session_array = dtls_server->nx_dtls_server_sessions;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* See if there are any free entries. */
for (i = 0; i < num_sessions; ++i)
{
/* See if there is a session available. */
if (session_array[i].nx_secure_dtls_session_in_use == NX_FALSE)
{
/* Set the IP and port to the passed-in values. */
NX_SECURE_MEMCPY(&session_array[i].nx_secure_dtls_remote_ip_address, ip_address, sizeof(NXD_ADDRESS)); /* Use case of memcpy is verified. */
session_array[i].nx_secure_dtls_local_port = local_port;
session_array[i].nx_secure_dtls_remote_port = remote_port;
session_array[i].nx_secure_dtls_session_in_use = NX_TRUE;
/* Check if ptotocol version is overrided. */
if (dtls_server -> nx_dtls_server_protocol_version_override)
{
_nx_secure_tls_session_protocol_version_override(&(session_array[i].nx_secure_dtls_tls_session), dtls_server -> nx_dtls_server_protocol_version_override);
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* Return the session. */
*dtls_session = &session_array[i];
return(NX_SUCCESS);
}
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* No session found, return NULL and an error. */
*dtls_session = NULL;
return(NX_SECURE_TLS_NO_FREE_DTLS_SESSIONS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* nx_secure_dtls_session_cache_find PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function allows the DTLS implementation to associate a DTLS */
/* session control block with a particular IP Address and Port, */
/* enabling multiple DTLS sessions on a single UDP socket. */
/* */
/* INPUT */
/* */
/* dtls_server DTLS server control block */
/* dtls_session Returned DTLS session */
/* ip_address IP address to match */
/* remote_port Remote port to match */
/* local_port Local port to match */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_secure_dtls_receive_callback DTLS receive callback function*/
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT nx_secure_dtls_session_cache_find(NX_SECURE_DTLS_SERVER *dtls_server, NX_SECURE_DTLS_SESSION **dtls_session, NXD_ADDRESS *ip_address, UINT remote_port, UINT local_port)
{
NX_SECURE_DTLS_SESSION *session_array;
UINT num_sessions;
UINT i;
/* Get our session cache information from the DTLS server instance. */
num_sessions = dtls_server->nx_dtls_server_sessions_count;
session_array = dtls_server->nx_dtls_server_sessions;
/* Get the protection. */
tx_mutex_get(&_nx_secure_tls_protection, TX_WAIT_FOREVER);
/* See if there are any matches. */
for (i = 0; i < num_sessions; ++i)
{
/* Check remote port. */
if (session_array[i].nx_secure_dtls_remote_port != remote_port)
{
continue;
}
/* Check local port. */
if (session_array[i].nx_secure_dtls_local_port != local_port)
{
continue;
}
/* Check remote IP address version. */
if (session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_version !=
ip_address -> nxd_ip_version)
{
continue;
}
/* Check actual remote IP address value. */
if (ip_address -> nxd_ip_version == NX_IP_VERSION_V4)
{
if (session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v4 ==
ip_address -> nxd_ip_address.v4)
{
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* Return the session. */
*dtls_session = &session_array[i];
return(NX_SUCCESS);
}
}
#ifdef FEATURE_NX_IPV6
else if ((session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[0] == ip_address -> nxd_ip_address.v6[0]) &&
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[1] == ip_address -> nxd_ip_address.v6[1]) &&
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[2] == ip_address -> nxd_ip_address.v6[2]) &&
(session_array[i].nx_secure_dtls_remote_ip_address.nxd_ip_address.v6[3] == ip_address -> nxd_ip_address.v6[3]))
{
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* Return the session. */
*dtls_session = &session_array[i];
return(NX_SUCCESS);
}
#endif /* FEATURE_NX_IPV6 */
}
/* Release the protection. */
tx_mutex_put(&_nx_secure_tls_protection);
/* No session found, return NULL and an error. */
*dtls_session = NULL;
return(NX_SECURE_DTLS_SESSION_NOT_FOUND);
}
#endif /* NX_SECURE_ENABLE_DTLS */
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