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Rebase and address review comments

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Signed-off-by: Xiaofei Bai <xiaofei.bai@arm.com>
This commit is contained in:
Xiaofei Bai 2022-01-26 09:21:54 +00:00
parent 69fcd39774
commit 82f0a9a1db
3 changed files with 59 additions and 147 deletions
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124
library/ssl_tls13_generic.c
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@ -136,90 +136,6 @@ void mbedtls_ssl_tls13_add_hs_hdr_to_checksum( mbedtls_ssl_context *ssl,
}
#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
/*
* mbedtls_ssl_tls13_write_sig_alg_ext( )
*
* enum {
* ....
* ecdsa_secp256r1_sha256( 0x0403 ),
* ecdsa_secp384r1_sha384( 0x0503 ),
* ecdsa_secp521r1_sha512( 0x0603 ),
* ....
* } SignatureScheme;
*
* struct {
* SignatureScheme supported_signature_algorithms<2..2^16-2>;
* } SignatureSchemeList;
*
* Only if we handle at least one key exchange that needs signatures.
*/
int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
unsigned char *buf,
unsigned char *end,
size_t *out_len )
{
unsigned char *p = buf;
unsigned char *supported_sig_alg; /* Start of supported_signature_algorithms */
size_t supported_sig_alg_len = 0; /* Length of supported_signature_algorithms */
*out_len = 0;
/* Skip the extension on the client if all allowed key exchanges
* are PSK-based. */
#if defined(MBEDTLS_SSL_CLI_C)
if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
!mbedtls_ssl_conf_tls13_some_ephemeral_enabled( ssl ) )
{
return( 0 );
}
#endif /* MBEDTLS_SSL_CLI_C */
MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding signature_algorithms extension" ) );
/* Check if we have space for header and length field:
* - extension_type (2 bytes)
* - extension_data_length (2 bytes)
* - supported_signature_algorithms_length (2 bytes)
*/
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 );
p += 6;
/*
* Write supported_signature_algorithms
*/
supported_sig_alg = p;
for( const uint16_t *sig_alg = ssl->conf->tls13_sig_algs;
*sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
{
MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
MBEDTLS_PUT_UINT16_BE( *sig_alg, p, 0 );
p += 2;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "signature scheme [%x]", *sig_alg ) );
}
/* Length of supported_signature_algorithms */
supported_sig_alg_len = p - supported_sig_alg;
if( supported_sig_alg_len == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 1, ( "No signature algorithms defined." ) );
return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
}
/* Write extension_type */
MBEDTLS_PUT_UINT16_BE( MBEDTLS_TLS_EXT_SIG_ALG, buf, 0 );
/* Write extension_data_length */
MBEDTLS_PUT_UINT16_BE( supported_sig_alg_len + 2, buf, 2 );
/* Write length of supported_signature_algorithms */
MBEDTLS_PUT_UINT16_BE( supported_sig_alg_len, buf, 4 );
/* Output the total length of signature algorithms extension. */
*out_len = p - buf;
ssl->handshake->extensions_present |= MBEDTLS_SSL_EXT_SIG_ALG;
return( 0 );
}
/* mbedtls_ssl_tls13_parse_sig_alg_ext()
*
* enum {
@ -239,34 +155,37 @@ int mbedtls_ssl_tls13_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
const unsigned char *end )
{
const unsigned char *p = buf;
const uint16_t *sig_alg;
unsigned int signature_scheme; /* store received signature algorithm scheme */
size_t sig_algs_len = 0;
uint16_t *sig_algs;
const unsigned char *sig_algs_end;
uint16_t sig_alg;
uint32_t common_idx = 0; /* iterate through received signature schemes list */
/* skip 2 bytes of signature algorithms length */
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
sig_algs_len = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
memset( ssl->handshake->sig_algs, 0, sizeof( ssl->handshake->sig_algs ) );
sig_algs = mbedtls_calloc( MBEDTLS_SIG_ALGS_SIZE, sizeof( uint16_t ) );
if( sig_algs == NULL )
return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
while( p < end && common_idx + 1 < MBEDTLS_PK_SIGNATURE_MAX_SIZE )
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, sig_algs_len );
sig_algs_end = p + sig_algs_len;
while( p < sig_algs_end && common_idx + 1 < MBEDTLS_SIG_ALGS_SIZE )
{
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
signature_scheme = MBEDTLS_GET_UINT16_BE( p, 0 );
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, sig_algs_end, 2 );
sig_alg = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
MBEDTLS_SSL_DEBUG_MSG( 4, ( "received signature algorithm: 0x%x",
signature_scheme ) );
sig_alg ) );
for( sig_alg = ssl->conf->tls13_sig_algs;
*sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
if( mbedtls_ssl_sig_alg_is_offered( ssl, sig_alg ) &&
mbedtls_ssl_sig_alg_is_supported( ssl, sig_alg ) )
{
if( *sig_alg == signature_scheme )
{
ssl->handshake->sig_algs[common_idx] = signature_scheme;
common_idx++;
break;
}
sig_algs[common_idx] = sig_alg;
common_idx += 1;
}
}
/* Check that we consumed all the message. */
@ -276,6 +195,7 @@ int mbedtls_ssl_tls13_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
( "Signature algorithms extension length misaligned" ) );
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
MBEDTLS_ERR_SSL_DECODE_ERROR );
mbedtls_free( sig_algs );
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
}
@ -284,11 +204,13 @@ int mbedtls_ssl_tls13_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no signature algorithm in common" ) );
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
mbedtls_free( sig_algs );
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
}
ssl->handshake->sig_algs[common_idx] = MBEDTLS_TLS1_3_SIG_NONE;
sig_algs[common_idx] = MBEDTLS_TLS1_3_SIG_NONE;
ssl->handshake->sig_algs = sig_algs;
ssl->handshake->sig_algs_heap_allocated = 1;
return( 0 );
}