378 lines
14 KiB
Python
Executable File
378 lines
14 KiB
Python
Executable File
#! /usr/bin/env python3
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#
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# Copyright 2017-2020 Linaro Limited
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# Copyright 2019-2020 Arm Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may 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,
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# WITHOUT 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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import re
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import click
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import getpass
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import imgtool.keys as keys
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import sys
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from imgtool import image, imgtool_version
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from imgtool.version import decode_version
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from .keys import (
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RSAUsageError, ECDSAUsageError, Ed25519UsageError, X25519UsageError)
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MIN_PYTHON_VERSION = (3, 6)
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if sys.version_info < MIN_PYTHON_VERSION:
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sys.exit("Python %s.%s or newer is required by imgtool."
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% MIN_PYTHON_VERSION)
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def gen_rsa2048(keyfile, passwd):
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keys.RSA.generate().export_private(path=keyfile, passwd=passwd)
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def gen_rsa3072(keyfile, passwd):
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keys.RSA.generate(key_size=3072).export_private(path=keyfile,
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passwd=passwd)
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def gen_ecdsa_p256(keyfile, passwd):
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keys.ECDSA256P1.generate().export_private(keyfile, passwd=passwd)
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def gen_ecdsa_p224(keyfile, passwd):
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print("TODO: p-224 not yet implemented")
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def gen_ed25519(keyfile, passwd):
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keys.Ed25519.generate().export_private(path=keyfile, passwd=passwd)
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def gen_x25519(keyfile, passwd):
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keys.X25519.generate().export_private(path=keyfile, passwd=passwd)
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valid_langs = ['c', 'rust']
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keygens = {
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'rsa-2048': gen_rsa2048,
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'rsa-3072': gen_rsa3072,
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'ecdsa-p256': gen_ecdsa_p256,
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'ecdsa-p224': gen_ecdsa_p224,
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'ed25519': gen_ed25519,
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'x25519': gen_x25519,
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}
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def load_key(keyfile):
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# TODO: better handling of invalid pass-phrase
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key = keys.load(keyfile)
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if key is not None:
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return key
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passwd = getpass.getpass("Enter key passphrase: ").encode('utf-8')
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return keys.load(keyfile, passwd)
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def get_password():
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while True:
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passwd = getpass.getpass("Enter key passphrase: ")
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passwd2 = getpass.getpass("Reenter passphrase: ")
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if passwd == passwd2:
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break
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print("Passwords do not match, try again")
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# Password must be bytes, always use UTF-8 for consistent
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# encoding.
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return passwd.encode('utf-8')
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@click.option('-p', '--password', is_flag=True,
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help='Prompt for password to protect key')
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@click.option('-t', '--type', metavar='type', required=True,
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type=click.Choice(keygens.keys()), prompt=True,
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help='{}'.format('One of: {}'.format(', '.join(keygens.keys()))))
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@click.option('-k', '--key', metavar='filename', required=True)
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@click.command(help='Generate pub/private keypair')
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def keygen(type, key, password):
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password = get_password() if password else None
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keygens[type](key, password)
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@click.option('-l', '--lang', metavar='lang', default=valid_langs[0],
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type=click.Choice(valid_langs))
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@click.option('-k', '--key', metavar='filename', required=True)
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@click.command(help='Dump public key from keypair')
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def getpub(key, lang):
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key = load_key(key)
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if key is None:
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print("Invalid passphrase")
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elif lang == 'c':
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key.emit_c_public()
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elif lang == 'rust':
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key.emit_rust_public()
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else:
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raise ValueError("BUG: should never get here!")
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@click.option('--minimal', default=False, is_flag=True,
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help='Reduce the size of the dumped private key to include only '
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'the minimum amount of data required to decrypt. This '
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'might require changes to the build config. Check the docs!'
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)
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@click.option('-k', '--key', metavar='filename', required=True)
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@click.command(help='Dump private key from keypair')
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def getpriv(key, minimal):
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key = load_key(key)
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if key is None:
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print("Invalid passphrase")
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try:
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key.emit_private(minimal)
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except (RSAUsageError, ECDSAUsageError, Ed25519UsageError,
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X25519UsageError) as e:
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raise click.UsageError(e)
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@click.argument('imgfile')
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@click.option('-k', '--key', metavar='filename')
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@click.command(help="Check that signed image can be verified by given key")
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def verify(key, imgfile):
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key = load_key(key) if key else None
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ret, version = image.Image.verify(imgfile, key)
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if ret == image.VerifyResult.OK:
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print("Image was correctly validated")
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print("Image version: {}.{}.{}+{}".format(*version))
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return
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elif ret == image.VerifyResult.INVALID_MAGIC:
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print("Invalid image magic; is this an MCUboot image?")
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elif ret == image.VerifyResult.INVALID_TLV_INFO_MAGIC:
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print("Invalid TLV info magic; is this an MCUboot image?")
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elif ret == image.VerifyResult.INVALID_HASH:
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print("Image has an invalid sha256 digest")
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elif ret == image.VerifyResult.INVALID_SIGNATURE:
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print("No signature found for the given key")
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else:
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print("Unknown return code: {}".format(ret))
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sys.exit(1)
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def validate_version(ctx, param, value):
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try:
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decode_version(value)
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return value
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except ValueError as e:
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raise click.BadParameter("{}".format(e))
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def validate_security_counter(ctx, param, value):
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if value is not None:
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if value.lower() == 'auto':
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return 'auto'
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else:
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try:
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return int(value, 0)
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except ValueError:
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raise click.BadParameter(
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"{} is not a valid integer. Please use code literals "
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"prefixed with 0b/0B, 0o/0O, or 0x/0X as necessary."
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.format(value))
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def validate_header_size(ctx, param, value):
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min_hdr_size = image.IMAGE_HEADER_SIZE
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if value < min_hdr_size:
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raise click.BadParameter(
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"Minimum value for -H/--header-size is {}".format(min_hdr_size))
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return value
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def get_dependencies(ctx, param, value):
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if value is not None:
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versions = []
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images = re.findall(r"\((\d+)", value)
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if len(images) == 0:
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raise click.BadParameter(
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"Image dependency format is invalid: {}".format(value))
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raw_versions = re.findall(r",\s*([0-9.+]+)\)", value)
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if len(images) != len(raw_versions):
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raise click.BadParameter(
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'''There's a mismatch between the number of dependency images
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and versions in: {}'''.format(value))
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for raw_version in raw_versions:
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try:
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versions.append(decode_version(raw_version))
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except ValueError as e:
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raise click.BadParameter("{}".format(e))
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dependencies = dict()
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dependencies[image.DEP_IMAGES_KEY] = images
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dependencies[image.DEP_VERSIONS_KEY] = versions
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return dependencies
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class BasedIntParamType(click.ParamType):
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name = 'integer'
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def convert(self, value, param, ctx):
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try:
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return int(value, 0)
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except ValueError:
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self.fail('%s is not a valid integer. Please use code literals '
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'prefixed with 0b/0B, 0o/0O, or 0x/0X as necessary.'
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% value, param, ctx)
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@click.argument('outfile')
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@click.argument('infile')
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@click.option('--custom-tlv', required=False, nargs=2, default=[],
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multiple=True, metavar='[tag] [value]',
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help='Custom TLV that will be placed into protected area. '
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'Add "0x" prefix if the value should be interpreted as an '
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'integer, otherwise it will be interpreted as a string. '
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'Specify the option multiple times to add multiple TLVs.')
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@click.option('-R', '--erased-val', type=click.Choice(['0', '0xff']),
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required=False,
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help='The value that is read back from erased flash.')
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@click.option('-x', '--hex-addr', type=BasedIntParamType(), required=False,
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help='Adjust address in hex output file.')
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@click.option('-L', '--load-addr', type=BasedIntParamType(), required=False,
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help='Load address for image when it should run from RAM.')
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@click.option('--save-enctlv', default=False, is_flag=True,
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help='When upgrading, save encrypted key TLVs instead of plain '
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'keys. Enable when BOOT_SWAP_SAVE_ENCTLV config option '
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'was set.')
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@click.option('-E', '--encrypt', metavar='filename',
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help='Encrypt image using the provided public key')
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@click.option('-e', '--endian', type=click.Choice(['little', 'big']),
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default='little', help="Select little or big endian")
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@click.option('--overwrite-only', default=False, is_flag=True,
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help='Use overwrite-only instead of swap upgrades')
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@click.option('--boot-record', metavar='sw_type', help='Create CBOR encoded '
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'boot record TLV. The sw_type represents the role of the '
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'software component (e.g. CoFM for coprocessor firmware). '
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'[max. 12 characters]')
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@click.option('-M', '--max-sectors', type=int,
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help='When padding allow for this amount of sectors (defaults '
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'to 128)')
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@click.option('--confirm', default=False, is_flag=True,
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help='When padding the image, mark it as confirmed')
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@click.option('--pad', default=False, is_flag=True,
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help='Pad image to --slot-size bytes, adding trailer magic')
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@click.option('-S', '--slot-size', type=BasedIntParamType(), required=True,
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help='Size of the slot where the image will be written')
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@click.option('--pad-header', default=False, is_flag=True,
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help='Add --header-size zeroed bytes at the beginning of the '
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'image')
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@click.option('-H', '--header-size', callback=validate_header_size,
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type=BasedIntParamType(), required=True)
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@click.option('--pad-sig', default=False, is_flag=True,
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help='Add 0-2 bytes of padding to ECDSA signature '
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'(for mcuboot <1.5)')
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@click.option('-d', '--dependencies', callback=get_dependencies,
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required=False, help='''Add dependence on another image, format:
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"(<image_ID>,<image_version>), ... "''')
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@click.option('-s', '--security-counter', callback=validate_security_counter,
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help='Specify the value of security counter. Use the `auto` '
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'keyword to automatically generate it from the image version.')
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@click.option('-v', '--version', callback=validate_version, required=True)
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@click.option('--align', type=click.Choice(['1', '2', '4', '8']),
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required=True)
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@click.option('--public-key-format', type=click.Choice(['hash', 'full']),
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default='hash', help='In what format to add the public key to '
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'the image manifest: full key or hash of the key.')
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@click.option('-k', '--key', metavar='filename')
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@click.command(help='''Create a signed or unsigned image\n
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INFILE and OUTFILE are parsed as Intel HEX if the params have
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.hex extension, otherwise binary format is used''')
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def sign(key, public_key_format, align, version, pad_sig, header_size,
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pad_header, slot_size, pad, confirm, max_sectors, overwrite_only,
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endian, encrypt, infile, outfile, dependencies, load_addr, hex_addr,
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erased_val, save_enctlv, security_counter, boot_record, custom_tlv):
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img = image.Image(version=decode_version(version), header_size=header_size,
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pad_header=pad_header, pad=pad, confirm=confirm,
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align=int(align), slot_size=slot_size,
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max_sectors=max_sectors, overwrite_only=overwrite_only,
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endian=endian, load_addr=load_addr, erased_val=erased_val,
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save_enctlv=save_enctlv,
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security_counter=security_counter)
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img.load(infile)
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key = load_key(key) if key else None
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enckey = load_key(encrypt) if encrypt else None
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if enckey and key:
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if ((isinstance(key, keys.ECDSA256P1) and
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not isinstance(enckey, keys.ECDSA256P1Public))
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or (isinstance(key, keys.RSA) and
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not isinstance(enckey, keys.RSAPublic))):
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# FIXME
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raise click.UsageError("Signing and encryption must use the same "
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"type of key")
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if pad_sig and hasattr(key, 'pad_sig'):
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key.pad_sig = True
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# Get list of custom protected TLVs from the command-line
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custom_tlvs = {}
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for tlv in custom_tlv:
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tag = int(tlv[0], 0)
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if tag in custom_tlvs:
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raise click.UsageError('Custom TLV %s already exists.' % hex(tag))
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if tag in image.TLV_VALUES.values():
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raise click.UsageError(
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'Custom TLV %s conflicts with predefined TLV.' % hex(tag))
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value = tlv[1]
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if value.startswith('0x'):
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if len(value[2:]) % 2:
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raise click.UsageError('Custom TLV length is odd.')
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custom_tlvs[tag] = bytes.fromhex(value[2:])
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else:
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custom_tlvs[tag] = value.encode('utf-8')
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img.create(key, public_key_format, enckey, dependencies, boot_record,
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custom_tlvs)
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img.save(outfile, hex_addr)
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class AliasesGroup(click.Group):
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_aliases = {
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"create": "sign",
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}
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def list_commands(self, ctx):
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cmds = [k for k in self.commands]
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aliases = [k for k in self._aliases]
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return sorted(cmds + aliases)
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def get_command(self, ctx, cmd_name):
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rv = click.Group.get_command(self, ctx, cmd_name)
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if rv is not None:
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return rv
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if cmd_name in self._aliases:
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return click.Group.get_command(self, ctx, self._aliases[cmd_name])
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return None
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@click.command(help='Print imgtool version information')
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def version():
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print(imgtool_version)
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@click.command(cls=AliasesGroup,
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context_settings=dict(help_option_names=['-h', '--help']))
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def imgtool():
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pass
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imgtool.add_command(keygen)
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imgtool.add_command(getpub)
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imgtool.add_command(getpriv)
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imgtool.add_command(verify)
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imgtool.add_command(sign)
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imgtool.add_command(version)
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if __name__ == '__main__':
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imgtool()
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