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Add write selected_identity

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Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
This commit is contained in:
Jerry Yu 2022-07-11 06:10:03 +00:00
parent 36847820fa
commit 032b15ce5e
1 changed files with 71 additions and 0 deletions
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71
library/ssl_tls13_server.c
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@ -361,6 +361,61 @@ exit_failue:
#endif
return( ret );
}
/*
* struct {
* select ( Handshake.msg_type ) {
* ....
* case server_hello:
* uint16 selected_identity;
* }
* } PreSharedKeyExtension;
*/
static int ssl_tls13_write_selected_identity_ext( mbedtls_ssl_context *ssl,
unsigned char *buf,
unsigned char *end,
size_t *olen )
{
unsigned char *p = (unsigned char*)buf;
size_t selected_identity;
*olen = 0;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
#else
if( ssl->handshake->psk == NULL )
#endif
{
/* We shouldn't have called this extension writer unless we've
* chosen to use a PSK. */
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding pre_shared_key extension" ) );
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 );
/* Extension Type */
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_PRE_SHARED_KEY, p, 0 );
/* Extension Length */
MBEDTLS_PUT_UINT16_BE( 2, p, 2 );
/* NOTE: This will need to be adjusted once we support multiple PSKs
* being offered by the client. */
selected_identity = 0;
/* Write selected_identity */
MBEDTLS_PUT_UINT16_BE( selected_identity, p, 4 );
*olen = 6;
MBEDTLS_SSL_DEBUG_MSG( 4, ( "sent selected_identity: %" MBEDTLS_PRINTF_SIZET,
selected_identity ) );
return( 0 );
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
/* From RFC 8446:
@ -1157,6 +1212,7 @@ static int ssl_tls13_parse_client_hello( mbedtls_ssl_context *ssl,
mbedtls_ssl_add_hs_hdr_to_checksum( ssl,
MBEDTLS_SSL_HS_CLIENT_HELLO,
p - buf );
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
/* Update checksum with either
* - The entire content of the CH message, if no PSK extension is present
@ -1645,6 +1701,21 @@ static int ssl_tls13_write_server_hello_body( mbedtls_ssl_context *ssl,
p += output_len;
}
#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
MBEDTLS_SSL_DEBUG_MSG( 2,( " mbedtls_ssl_tls13_some_psk_enabled %d", mbedtls_ssl_tls13_some_psk_enabled( ssl ) ) );
if( mbedtls_ssl_tls13_some_psk_enabled( ssl ) )
{
ret = ssl_tls13_write_selected_identity_ext( ssl, p, end, &output_len );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "ssl_tls13_write_selected_identity_ext",
ret );
return( ret );
}
p += output_len;
}
#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
MBEDTLS_PUT_UINT16_BE( p - p_extensions_len - 2, p_extensions_len, 0 );
MBEDTLS_SSL_DEBUG_BUF( 4, "server hello extensions",