netxduo
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Outline
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#define NX_SECURE_SOURCE_CODE
#include "nx_secure_tls.h"
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_nx_secure_tls_session_sni_extension_parse(NX_SECURE_TLS_SESSION *, NX_SECURE_TLS_HELLO_EXTENSION *, UINT, NX_SECURE_X509_DNS_NAME *)
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SourceVuSTM32 Libraries and Samplesnetxduonx_secure/src/nx_secure_tls_session_sni_extension_parse.c
 
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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 */ /** */ /** Transport Layer Security (TLS) */ /** */... /**************************************************************************/ /**************************************************************************/ #define NX_SECURE_SOURCE_CODE #include "nx_secure_tls.h" ... /**************************************************************************/ /* */ /* FUNCTION RELEASE */ /* */ /* _nx_secure_tls_session_sni_extension_parse PORTABLE C */ /* 6.1 */ /* AUTHOR */ /* */ /* Timothy Stapko, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function parses an incoming Hello extensions block, looking */ /* for a Server Name Indication (SNI) extension. The SNI extension */ /* (RFC 6066) currently contains only a single DNS Name entry, so only */ /* a single DNS Name is returned. If new RFCs add other name types in */ /* the future, new API will be added. */ /* */ /* This function is intended to be called in a TLS Server callback */ /* as part of processing Hello message extensions. The SNI extension */ /* is only sent by TLS Clients so if a Client receives an SNI */ /* extension it should be ignored. */ /* */ /* INPUT */ /* */ /* tls_session TLS control block */ /* extensions Pointer to received extensions*/ /* num_extensions The number of extensions */ /* received */ /* dns_name Return the name requested by */ /* the client */ /* */ /* OUTPUT */ /* */ /* status Completion status */ /* */ /* CALLS */ /* */ /* None */ /* */ /* 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), */ /* verified memcpy use cases, */ /* resulting in version 6.1 */ /* */... /**************************************************************************/ UINT _nx_secure_tls_session_sni_extension_parse(NX_SECURE_TLS_SESSION *tls_session, NX_SECURE_TLS_HELLO_EXTENSION *extensions, UINT num_extensions, NX_SECURE_X509_DNS_NAME *dns_name) { UINT i; const UCHAR *data_ptr; UCHAR name_type; USHORT list_length; UINT offset; NX_PARAMETER_NOT_USED(tls_session); /* Loop through the received extensions until we find SNI or hit the end. */ for (i = 0; i < num_extensions; ++i) { if (extensions[i].nx_secure_tls_extension_id == NX_SECURE_TLS_EXTENSION_SERVER_NAME_INDICATION) { /* Extract the data from the extension. */ /* Server Name Indication Extension structure: * | 2 | 2 | 1 | 2 | <name length> | * | Ext Type | list length | name type | name length | Host name string | *//* ... */ /* The generic extension parsing already handled the extension type, so this points to the list length field. *//* ... */ data_ptr = extensions[i].nx_secure_tls_extension_data; /* Extract the list length. */ list_length = (USHORT)((data_ptr[0] << 8) + data_ptr[1]); offset = 2; /* Extract the name type. */ name_type = data_ptr[offset]; offset += 1; /* Extract the name length. */ dns_name -> nx_secure_x509_dns_name_length = (USHORT)((data_ptr[offset] << 8) + data_ptr[offset + 1]); offset += 2; /* Check the name type and lengths. */ if (name_type != NX_SECURE_TLS_SNI_NAME_TYPE_DNS || list_length > extensions[i].nx_secure_tls_extension_data_length || dns_name -> nx_secure_x509_dns_name_length > list_length) { return(NX_SECURE_TLS_SNI_EXTENSION_INVALID); }if (name_type != NX_SECURE_TLS_SNI_NAME_TYPE_DNS || list_length > extensions[i].nx_secure_tls_extension_data_length || dns_name -> nx_secure_x509_dns_name_length > list_length) { ... } /* Make sure we don't copy over the end of the buffer. */ if (dns_name -> nx_secure_x509_dns_name_length > NX_SECURE_X509_DNS_NAME_MAX) { dns_name -> nx_secure_x509_dns_name_length = NX_SECURE_X509_DNS_NAME_MAX; }if (dns_name -> nx_secure_x509_dns_name_length > NX_SECURE_X509_DNS_NAME_MAX) { ... } /* Name and lengths check out, save off the name data. */ NX_SECURE_MEMCPY(dns_name -> nx_secure_x509_dns_name, &data_ptr[offset], dns_name -> nx_secure_x509_dns_name_length); /* Use case of memcpy is verified. */ /* Success! */ return(NX_SUCCESS); }if (extensions[i].nx_secure_tls_extension_id == NX_SECURE_TLS_EXTENSION_SERVER_NAME_INDICATION) { ... } }for (i = 0; i < num_extensions; ++i) { ... } /* Searched through all the extensions, did not find SNI. */ return(NX_SECURE_TLS_EXTENSION_NOT_FOUND); }{ ... }
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