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Merge pull request #300 from gilles-peskine-arm/assemble-changelog

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Changelog assembly script
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This directory contains changelog entries that have not yet been merged
to the changelog file (../ChangeLog.md).
A changelog entry file must have the extension *.md and must have the
following format:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
### Section title
* Change descritpion.
* Another change description.
### Another section title
* Yet another change description.
* Yet again another change description.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
See STANDARD_SECTIONS in ../scripts/assemble_changelog.py for
recognized section titles.

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# Mbed Crypto change history
## Unreleased changes
### Interface changes
* In the PSA API, forbid zero-length keys. To pass a zero-length input to a key derivation function, use a buffer instead (this is now always possible).
* Rename `psa_asymmetric_sign()` to `psa_sign_hash()` and `psa_asymmetric_verify()` to `psa_verify_hash()`.
### Default behavior changes
* The initial seeding of a CTR\_DRBG instance makes a second call to the entropy function to obtain entropy for a nonce if the entropy size is less than 3/2 times the key size. In case you want to disable the extra call to grab entropy, you can call `mbedtls_ctr_drbg_set_nonce_len()` to force the nonce length to 0.
### New features
* Key derivation inputs in the PSA API can now either come from a key object or from a buffer regardless of the step type.
* The CTR_DRBG module can grab a nonce from the entropy source during the initial seeding. The default nonce length is chosen based on the key size to achieve the security strength defined by NIST SP 800-90A. You can change it with `mbedtls_ctr_drbg_set_nonce_len()`.
* Add ENUMERATED tag support to the ASN.1 module. Contributed by msopiha-linaro in #307.
### Security
* Enforce that `mbedtls_entropy_func()` gathers a total of `MBEDTLS_ENTROPY_BLOCK_SIZE` bytes or more from strong sources. In the default configuration, on a platform with a single entropy source, the entropy module formerly only grabbed 32 bytes, which is good enough for security if the source is genuinely strong, but less than the expected 64 bytes (size of the entropy accumulator).
### Bug fixes
* Fix a buffer overflow in the PSA HMAC code when using a long key with an unsupported algorithm. Fixes #254.
* Fix `mbedtls_asn1_get_int` to support any number of leading zeros. Credit to OSS-Fuzz for finding a bug in an intermediate version of the fix.
* Fix `mbedtls_asn1_get_bitstring_null` to correctly parse bitstrings of at most 2 bytes.
* `mbedtls_ctr_drbg_set_entropy_len()` and `mbedtls_hmac_drbg_set_entropy_len()` now work if you call them before `mbedtls_ctr_drbg_seed()` or `mbedtls_hmac_drbg_seed()`.
* Fix some false-positive uninitialized variable warnings. Fix contributed by apple-ihack-geek in ARMmbed/mbedtls#2663.
### Performance improvements
* Remove a useless call to `mbedtls_ecp_group_free()`. Contributed by Alexander Krizhanovsky in #210.
* Speed up PBKDF2 by caching the digest calculation. Contributed by Jack Lloyd and Fortanix Inc in #277.
* Small performance improvement of `mbedtls_mpi_div_mpi()`. Contributed by Alexander Krizhanovsky in #308.
### Other changes
* Remove the technical possibility to define custom `mbedtls_md_info` structures, which was exposed only in an internal header.
* `psa_close_key(0)` and `psa_destroy_key(0)` now succeed (doing nothing, as before).
* Variables containing error codes are now initialized to an error code rather than success, so that coding mistakes or memory corruption tends to cause functions to return this error code rather than a success. There are no known instances where this changes the behavior of the library: this is merely a robustness improvement. #323
## Mbed Crypto 2.0.0

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#!/usr/bin/env python3
"""Assemble Mbed Crypto change log entries into the change log file.
Add changelog entries to the first level-2 section.
Create a new level-2 section for unreleased changes if needed.
Remove the input files unless --keep-entries is specified.
"""
# Copyright (C) 2019, Arm Limited, All Rights Reserved
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This file is part of Mbed Crypto (https://tls.mbed.org)
import argparse
from collections import OrderedDict
import glob
import os
import re
import sys
class InputFormatError(Exception):
def __init__(self, filename, line_number, message, *args, **kwargs):
message = '{}:{}: {}'.format(filename, line_number,
message.format(*args, **kwargs))
super().__init__(message)
class LostContent(Exception):
def __init__(self, filename, line):
message = ('Lost content from {}: "{}"'.format(filename, line))
super().__init__(message)
STANDARD_SECTIONS = (
b'Interface changes',
b'Default behavior changes',
b'Requirement changes',
b'New deprecations',
b'Removals',
b'New features',
b'Security',
b'Bug fixes',
b'Performance improvements',
b'Other changes',
)
class ChangeLog:
"""An Mbed Crypto changelog.
A changelog is a file in Markdown format. Each level 2 section title
starts a version, and versions are sorted in reverse chronological
order. Lines with a level 2 section title must start with '##'.
Within a version, there are multiple sections, each devoted to a kind
of change: bug fix, feature request, etc. Section titles should match
entries in STANDARD_SECTIONS exactly.
Within each section, each separate change should be on a line starting
with a '*' bullet. There may be blank lines surrounding titles, but
there should not be any blank line inside a section.
"""
_title_re = re.compile(br'#*')
def title_level(self, line):
"""Determine whether the line is a title.
Return (level, content) where level is the Markdown section level
(1 for '#', 2 for '##', etc.) and content is the section title
without leading or trailing whitespace. For a non-title line,
the level is 0.
"""
level = re.match(self._title_re, line).end()
return level, line[level:].strip()
# Only accept dotted version numbers (e.g. "3.1", not "3").
# Refuse ".x" in a version number where x is a letter: this indicates
# a version that is not yet released. Something like "3.1a" is accepted.
_version_number_re = re.compile(br'[0-9]+\.[0-9A-Za-z.]+')
_incomplete_version_number_re = re.compile(br'.*\.[A-Za-z]')
def section_is_released_version(self, title):
"""Whether this section is for a released version.
True if the given level-2 section title indicates that this section
contains released changes, otherwise False.
"""
# Assume that a released version has a numerical version number
# that follows a particular pattern. These criteria may be revised
# as needed in future versions of this script.
version_number = re.search(self._version_number_re, title)
if version_number:
return not re.search(self._incomplete_version_number_re,
version_number.group(0))
else:
return False
def unreleased_version_title(self):
"""The title to use if creating a new section for an unreleased version."""
# pylint: disable=no-self-use; this method may be overridden
return b'Unreleased changes'
def __init__(self, input_stream):
"""Create a changelog object.
Populate the changelog object from the content of the file
input_stream. This is typically a file opened for reading, but
can be any generator returning the lines to read.
"""
# Content before the level-2 section where the new entries are to be
# added.
self.header = []
# Content of the level-3 sections of where the new entries are to
# be added.
self.section_content = OrderedDict()
for section in STANDARD_SECTIONS:
self.section_content[section] = []
# Content of level-2 sections for already-released versions.
self.trailer = []
self.read_main_file(input_stream)
def read_main_file(self, input_stream):
"""Populate the changelog object from the content of the file.
This method is only intended to be called as part of the constructor
of the class and may not act sensibly on an object that is already
partially populated.
"""
# Parse the first level-2 section, containing changelog entries
# for unreleased changes.
# If we'll be expanding this section, everything before the first
# level-3 section title ("###...") following the first level-2
# section title ("##...") is passed through as the header
# and everything after the second level-2 section title is passed
# through as the trailer. Inside the first level-2 section,
# split out the level-3 sections.
# If we'll be creating a new version, the header is everything
# before the point where we want to add the level-2 section
# for this version, and the trailer is what follows.
level_2_seen = 0
current_section = None
for line in input_stream:
level, content = self.title_level(line)
if level == 2:
level_2_seen += 1
if level_2_seen == 1:
if self.section_is_released_version(content):
self.header.append(b'## ' +
self.unreleased_version_title() +
b'\n\n')
level_2_seen = 2
elif level == 3 and level_2_seen == 1:
current_section = content
self.section_content.setdefault(content, [])
if level_2_seen == 1 and current_section is not None:
if level != 3 and line.strip():
self.section_content[current_section].append(line)
elif level_2_seen <= 1:
self.header.append(line)
else:
self.trailer.append(line)
def add_file(self, input_stream):
"""Add changelog entries from a file.
Read lines from input_stream, which is typically a file opened
for reading. These lines must contain a series of level 3
Markdown sections with recognized titles. The corresponding
content is injected into the respective sections in the changelog.
The section titles must be either one of the hard-coded values
in STANDARD_SECTIONS in assemble_changelog.py or already present
in ChangeLog.md. Section titles must match byte-for-byte except that
leading or trailing whitespace is ignored.
"""
filename = input_stream.name
current_section = None
for line_number, line in enumerate(input_stream, 1):
if not line.strip():
continue
level, content = self.title_level(line)
if level == 3:
current_section = content
if current_section not in self.section_content:
raise InputFormatError(filename, line_number,
'Section {} is not recognized',
str(current_section)[1:])
elif level == 0:
if current_section is None:
raise InputFormatError(filename, line_number,
'Missing section title at the beginning of the file')
self.section_content[current_section].append(line)
else:
raise InputFormatError(filename, line_number,
'Only level 3 headers (###) are permitted')
def write(self, filename):
"""Write the changelog to the specified file.
"""
with open(filename, 'wb') as out:
for line in self.header:
out.write(line)
for section, lines in self.section_content.items():
if not lines:
continue
out.write(b'### ' + section + b'\n\n')
for line in lines:
out.write(line)
out.write(b'\n')
for line in self.trailer:
out.write(line)
def check_output(generated_output_file, main_input_file, merged_files):
"""Make sanity checks on the generated output.
The intent of these sanity checks is to have reasonable confidence
that no content has been lost.
The sanity check is that every line that is present in an input file
is also present in an output file. This is not perfect but good enough
for now.
"""
generated_output = set(open(generated_output_file, 'rb'))
for line in open(main_input_file, 'rb'):
if line not in generated_output:
raise LostContent('original file', line)
for merged_file in merged_files:
for line in open(merged_file, 'rb'):
if line not in generated_output:
raise LostContent(merged_file, line)
def finish_output(changelog, output_file, input_file, merged_files):
"""Write the changelog to the output file.
The input file and the list of merged files are used only for sanity
checks on the output.
"""
if os.path.exists(output_file) and not os.path.isfile(output_file):
# The output is a non-regular file (e.g. pipe). Write to it directly.
output_temp = output_file
else:
# The output is a regular file. Write to a temporary file,
# then move it into place atomically.
output_temp = output_file + '.tmp'
changelog.write(output_temp)
check_output(output_temp, input_file, merged_files)
if output_temp != output_file:
os.rename(output_temp, output_file)
def remove_merged_entries(files_to_remove):
for filename in files_to_remove:
os.remove(filename)
def merge_entries(options):
"""Merge changelog entries into the changelog file.
Read the changelog file from options.input.
Read entries to merge from the directory options.dir.
Write the new changelog to options.output.
Remove the merged entries if options.keep_entries is false.
"""
with open(options.input, 'rb') as input_file:
changelog = ChangeLog(input_file)
files_to_merge = glob.glob(os.path.join(options.dir, '*.md'))
if not files_to_merge:
sys.stderr.write('There are no pending changelog entries.\n')
return
for filename in files_to_merge:
with open(filename, 'rb') as input_file:
changelog.add_file(input_file)
finish_output(changelog, options.output, options.input, files_to_merge)
if not options.keep_entries:
remove_merged_entries(files_to_merge)
def set_defaults(options):
"""Add default values for missing options."""
output_file = getattr(options, 'output', None)
if output_file is None:
options.output = options.input
if getattr(options, 'keep_entries', None) is None:
options.keep_entries = (output_file is not None)
def main():
"""Command line entry point."""
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--dir', '-d', metavar='DIR',
default='ChangeLog.d',
help='Directory to read entries from'
' (default: ChangeLog.d)')
parser.add_argument('--input', '-i', metavar='FILE',
default='ChangeLog.md',
help='Existing changelog file to read from and augment'
' (default: ChangeLog.md)')
parser.add_argument('--keep-entries',
action='store_true', dest='keep_entries', default=None,
help='Keep the files containing entries'
' (default: remove them if --output/-o is not specified)')
parser.add_argument('--no-keep-entries',
action='store_false', dest='keep_entries',
help='Remove the files containing entries after they are merged'
' (default: remove them if --output/-o is not specified)')
parser.add_argument('--output', '-o', metavar='FILE',
help='Output changelog file'
' (default: overwrite the input)')
options = parser.parse_args()
set_defaults(options)
merge_entries(options)
if __name__ == '__main__':
main()