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mbedtls_ssl_cookie_check: zeroize expected cookie on cookie mismatch

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-12-13 12:35:08 +01:00
parent b3f4e5b1e1
commit 69d3b86baa
1 changed files with 16 additions and 6 deletions
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22
library/ssl_cookie.c
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@ -218,15 +218,20 @@ int mbedtls_ssl_cookie_check( void *p_ctx,
#if defined(MBEDTLS_THREADING_C) #if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR, {
MBEDTLS_ERR_THREADING_MUTEX_ERROR ) ); ret = MBEDTLS_ERROR_ADD( MBEDTLS_ERR_SSL_INTERNAL_ERROR,
MBEDTLS_ERR_THREADING_MUTEX_ERROR );
}
#endif #endif
if( ret != 0 ) if( ret != 0 )
return( ret ); goto exit;
if( mbedtls_ct_memcmp( cookie + 4, ref_hmac, sizeof( ref_hmac ) ) != 0 ) if( mbedtls_ct_memcmp( cookie + 4, ref_hmac, sizeof( ref_hmac ) ) != 0 )
return( -1 ); {
ret = -1;
goto exit;
}
#if defined(MBEDTLS_HAVE_TIME) #if defined(MBEDTLS_HAVE_TIME)
cur_time = (unsigned long) mbedtls_time( NULL ); cur_time = (unsigned long) mbedtls_time( NULL );
@ -240,8 +245,13 @@ int mbedtls_ssl_cookie_check( void *p_ctx,
( (unsigned long) cookie[3] ); ( (unsigned long) cookie[3] );
if( ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout ) if( ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout )
return( -1 ); {
ret = -1;
goto exit;
}
return( 0 ); exit:
mbedtls_platform_zeroize( ref_hmac, sizeof( ref_hmac ) );
return( ret );
} }
#endif /* MBEDTLS_SSL_COOKIE_C */ #endif /* MBEDTLS_SSL_COOKIE_C */