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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 */
/** */
/** X.509 Digital Certificates */
/** */
/**************************************************************************/
/**************************************************************************/
#define NX_SECURE_SOURCE_CODE
#include "nx_secure_x509.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_secure_x509_certificate_list_add PORTABLE C */
/* 6.1.6 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function adds a NX_SECURE_X509_CERT instance to a */
/* certificate linked list. These lists are used to store certificates */
/* for the local device, trusted store, and for allocating space for */
/* receiving certificates. */
/* */
/* This function will reject certificates with duplicate distinguished */
/* names unless "duplicates_ok" is set to non-zero. Some stores (e.g. */
/* the free store for incoming remote certificates) need to be able to */
/* store duplicate certificates. */
/* */
/* INPUT */
/* */
/* list_head Pointer to list head pointer */
/* certificate Pointer to certificate */
/* duplicates_ok If true, allow duplicates */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_secure_x509_distinguished_name_compare */
/* Compare distinguished name */
/* */
/* CALLED BY */
/* */
/* _nx_secure_x509_store_certificate_add Add certificate to free store */
/* _nx_secure_tls_process_remote_certificate */
/* Process server certificate */
/* */
/* 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 */
/* 04-02-2021 Timothy Stapko Modified comment(s), */
/* removed dependency on TLS, */
/* resulting in version 6.1.6 */
/* */
/**************************************************************************/
UINT _nx_secure_x509_certificate_list_add(NX_SECURE_X509_CERT **list_head,
NX_SECURE_X509_CERT *certificate, UINT duplicates_ok)
{
NX_SECURE_X509_CERT *current_cert;
NX_SECURE_X509_CERT *previous_cert;
INT compare_result;
/* Check to see if the head of the certificates list is NULL. */
if (*list_head == NULL)
{
/* Our certificate pointer was NULL, so just set it to this certificate. */
*list_head = certificate;
certificate -> nx_secure_x509_next_certificate = NULL;
}
else
{
/* There is already a certificate in the list. Walk the list
until we find the end and add our new certificate. */
current_cert = *list_head;
previous_cert = current_cert;
while (current_cert != NX_CRYPTO_NULL)
{
if (current_cert == certificate)
{
/* Oops, tried to add the same certificate twice (would lead
to circular list)! */
#ifdef NX_CRYPTO_STANDALONE_ENABLE
return(NX_CRYPTO_INVALID_PARAMETER);
#else
return(NX_INVALID_PARAMETERS);
#endif /* NX_CRYPTO_STANDALONE_ENABLE */
}
/* If the certificate has a non-zero identifier, make sure the identifier wasn't added yet! */
if (certificate -> nx_secure_x509_cert_identifier != 0 &&
current_cert -> nx_secure_x509_cert_identifier == certificate -> nx_secure_x509_cert_identifier)
{
/* Duplicate ID found - don't add to the list! */
return(NX_SECURE_X509_CERT_ID_DUPLICATE);
}
/* We want to be able to add duplicate entries to some of the certificate stores (e.g. the
free certificate list which contains uninitialized certs), so conditionally allow duplicates. */
if (!duplicates_ok)
{
/* Make sure we don't try to add the same cert twice. */
compare_result = _nx_secure_x509_distinguished_name_compare(¤t_cert -> nx_secure_x509_distinguished_name,
&certificate -> nx_secure_x509_distinguished_name, NX_SECURE_X509_NAME_COMMON_NAME);
if (compare_result == 0)
{
/* A certificate with the same distinguished name was already added to this list. */
#ifdef NX_CRYPTO_STANDALONE_ENABLE
return(NX_CRYPTO_INVALID_PARAMETER);
#else
return(NX_INVALID_PARAMETERS);
#endif /* NX_CRYPTO_STANDALONE_ENABLE */
}
}
/* Advance to the next certificate. */
previous_cert = current_cert;
current_cert = current_cert -> nx_secure_x509_next_certificate;
}
/* Append the new certificate to the end of the list. */
previous_cert -> nx_secure_x509_next_certificate = certificate;
certificate -> nx_secure_x509_next_certificate = NULL;
}
return(NX_SECURE_X509_SUCCESS);
}