d76a26e086
Keep applying the windows entropy patch (UWP support).
Remove no longer needed padlock patch.
Update thirdparty README to reflect changes, and new source inclusion
criteria.
(cherry picked from commit e375cbd094)
196 lines
7.8 KiB
C++
196 lines
7.8 KiB
C++
/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/**
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* \file mps_common.h
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*
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* \brief Common functions and macros used by MPS
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*/
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#ifndef MBEDTLS_MPS_COMMON_H
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#define MBEDTLS_MPS_COMMON_H
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#include "mps_error.h"
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#include <stdio.h>
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/**
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* \name SECTION: MPS Configuration
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*
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* \{
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*/
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/*! This flag controls whether the MPS-internal components
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* (reader, writer, Layer 1-3) perform validation of the
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* expected abstract state at the entry of API calls.
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*
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* Context: All MPS API functions impose assumptions/preconditions on the
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* context on which they operate. For example, every structure has a notion of
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* state integrity which is established by `xxx_init()` and preserved by any
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* calls to the MPS API which satisfy their preconditions and either succeed,
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* or fail with an error code which is explicitly documented to not corrupt
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* structure integrity (such as WANT_READ and WANT_WRITE);
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* apart from `xxx_init()` any function assumes state integrity as a
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* precondition (but usually more). If any of the preconditions is violated,
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* the function's behavior is entirely undefined.
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* In addition to state integrity, all MPS structures have a more refined
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* notion of abstract state that the API operates on. For example, all layers
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* have a notion of 'abtract read state' which indicates if incoming data has
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* been passed to the user, e.g. through mps_l2_read_start() for Layer 2
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* or mps_l3_read() in Layer 3. After such a call, it doesn't make sense to
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* call these reading functions again until the incoming data has been
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* explicitly 'consumed', e.g. through mps_l2_read_consume() for Layer 2 or
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* mps_l3_read_consume() on Layer 3. However, even if it doesn't make sense,
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* it's a design choice whether the API should fail gracefully on such
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* non-sensical calls or not, and that's what this option is about:
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*
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* This option determines whether the expected abstract state
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* is part of the API preconditions or not: If the option is set,
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* then the abstract state is not part of the precondition and is
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* thus required to be validated by the implementation. If an unexpected
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* abstract state is encountered, the implementation must fail gracefully
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* with error #MBEDTLS_ERR_MPS_OPERATION_UNEXPECTED.
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* Conversely, if this option is not set, then the expected abstract state
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* is included in the preconditions of the respective API calls, and
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* an implementation's behaviour is undefined if the abstract state is
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* not as expected.
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*
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* For example: Enabling this makes mps_l2_read_done() fail if
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* no incoming record is currently open; disabling this would
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* lead to undefined behavior in this case.
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*
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* Comment this to remove state validation.
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*/
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#define MBEDTLS_MPS_STATE_VALIDATION
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/*! This flag enables/disables assertions on the internal state of MPS.
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*
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* Assertions are sanity checks that should never trigger when MPS
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* is used within the bounds of its API and preconditions.
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*
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* Enabling this increases security by limiting the scope of
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* potential bugs, but comes at the cost of increased code size.
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*
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* Note: So far, there is no guiding principle as to what
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* expected conditions merit an assertion, and which don't.
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*
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* Comment this to disable assertions.
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*/
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#define MBEDTLS_MPS_ENABLE_ASSERTIONS
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/*! This flag controls whether tracing for MPS should be enabled. */
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//#define MBEDTLS_MPS_ENABLE_TRACE
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#if defined(MBEDTLS_MPS_STATE_VALIDATION)
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#define MBEDTLS_MPS_STATE_VALIDATE_RAW( cond, string ) \
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do \
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{ \
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if( !(cond) ) \
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{ \
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MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_ERROR, string ); \
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MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_OPERATION_UNEXPECTED ); \
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} \
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} while( 0 )
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#else /* MBEDTLS_MPS_STATE_VALIDATION */
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#define MBEDTLS_MPS_STATE_VALIDATE_RAW( cond, string ) \
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do \
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{ \
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( cond ); \
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} while( 0 )
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#endif /* MBEDTLS_MPS_STATE_VALIDATION */
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#if defined(MBEDTLS_MPS_ENABLE_ASSERTIONS)
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#define MBEDTLS_MPS_ASSERT_RAW( cond, string ) \
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do \
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{ \
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if( !(cond) ) \
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{ \
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MBEDTLS_MPS_TRACE( MBEDTLS_MPS_TRACE_TYPE_ERROR, string ); \
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MBEDTLS_MPS_TRACE_RETURN( MBEDTLS_ERR_MPS_INTERNAL_ERROR ); \
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} \
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} while( 0 )
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#else /* MBEDTLS_MPS_ENABLE_ASSERTIONS */
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#define MBEDTLS_MPS_ASSERT_RAW( cond, string ) do {} while( 0 )
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#endif /* MBEDTLS_MPS_ENABLE_ASSERTIONS */
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/* \} name SECTION: MPS Configuration */
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/**
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* \name SECTION: Common types
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*
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* Various common types used throughout MPS.
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* \{
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*/
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/** \brief The type of buffer sizes and offsets used in MPS structures.
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*
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* This is an unsigned integer type that should be large enough to
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* hold the length of any buffer or message processed by MPS.
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*
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* The reason to pick a value as small as possible here is
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* to reduce the size of MPS structures.
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*
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* \warning Care has to be taken when using a narrower type
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* than ::mbedtls_mps_size_t here because of
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* potential truncation during conversion.
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*
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* \warning Handshake messages in TLS may be up to 2^24 ~ 16Mb in size.
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* If mbedtls_mps_[opt_]stored_size_t is smaller than that, the
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* maximum handshake message is restricted accordingly.
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*
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* For now, we use the default type of size_t throughout, and the use of
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* smaller types or different types for ::mbedtls_mps_size_t and
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* ::mbedtls_mps_stored_size_t is not yet supported.
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*
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*/
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typedef size_t mbedtls_mps_stored_size_t;
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#define MBEDTLS_MPS_STORED_SIZE_MAX ( (mbedtls_mps_stored_size_t) -1 )
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/** \brief The type of buffer sizes and offsets used in the MPS API
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* and implementation.
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*
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* This must be at least as wide as ::mbedtls_stored_size_t but
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* may be chosen to be strictly larger if more suitable for the
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* target architecture.
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*
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* For example, in a test build for ARM Thumb, using uint_fast16_t
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* instead of uint16_t reduced the code size from 1060 Byte to 962 Byte,
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* so almost 10%.
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*/
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typedef size_t mbedtls_mps_size_t;
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#define MBEDTLS_MPS_SIZE_MAX ( (mbedtls_mps_size_t) -1 )
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#if MBEDTLS_MPS_STORED_SIZE_MAX > MBEDTLS_MPS_SIZE_MAX
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#error "Misconfiguration of mbedtls_mps_size_t and mbedtls_mps_stored_size_t."
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#endif
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/* \} SECTION: Common types */
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#endif /* MBEDTLS_MPS_COMMON_H */
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