293 lines
9.7 KiB
Python
293 lines
9.7 KiB
Python
|
# Copyright 2011 Sybren A. Stüvel <sybren@stuvel.eu>
|
||
|
|
#
|
||
|
|
# 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
|
||
|
|
#
|
||
|
|
# https://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.
|
||
|
|
|
||
|
|
"""Commandline scripts.
|
||
|
|
|
||
|
|
These scripts are called by the executables defined in setup.py.
|
||
|
|
"""
|
||
|
|
|
||
|
|
import abc
|
||
|
|
import sys
|
||
|
|
import typing
|
||
|
|
import optparse
|
||
|
|
|
||
|
|
import rsa
|
||
|
|
import rsa.key
|
||
|
|
import rsa.pkcs1
|
||
|
|
|
||
|
|
HASH_METHODS = sorted(rsa.pkcs1.HASH_METHODS.keys())
|
||
|
|
Indexable = typing.Union[typing.Tuple, typing.List[str]]
|
||
|
|
|
||
|
|
|
||
|
|
def keygen() -> None:
|
||
|
|
"""Key generator."""
|
||
|
|
|
||
|
|
# Parse the CLI options
|
||
|
|
parser = optparse.OptionParser(usage='usage: %prog [options] keysize',
|
||
|
|
description='Generates a new RSA keypair of "keysize" bits.')
|
||
|
|
|
||
|
|
parser.add_option('--pubout', type='string',
|
||
|
|
help='Output filename for the public key. The public key is '
|
||
|
|
'not saved if this option is not present. You can use '
|
||
|
|
'pyrsa-priv2pub to create the public key file later.')
|
||
|
|
|
||
|
|
parser.add_option('-o', '--out', type='string',
|
||
|
|
help='Output filename for the private key. The key is '
|
||
|
|
'written to stdout if this option is not present.')
|
||
|
|
|
||
|
|
parser.add_option('--form',
|
||
|
|
help='key format of the private and public keys - default PEM',
|
||
|
|
choices=('PEM', 'DER'), default='PEM')
|
||
|
|
|
||
|
|
(cli, cli_args) = parser.parse_args(sys.argv[1:])
|
||
|
|
|
||
|
|
if len(cli_args) != 1:
|
||
|
|
parser.print_help()
|
||
|
|
raise SystemExit(1)
|
||
|
|
|
||
|
|
try:
|
||
|
|
keysize = int(cli_args[0])
|
||
|
|
except ValueError:
|
||
|
|
parser.print_help()
|
||
|
|
print('Not a valid number: %s' % cli_args[0], file=sys.stderr)
|
||
|
|
raise SystemExit(1)
|
||
|
|
|
||
|
|
print('Generating %i-bit key' % keysize, file=sys.stderr)
|
||
|
|
(pub_key, priv_key) = rsa.newkeys(keysize)
|
||
|
|
|
||
|
|
# Save public key
|
||
|
|
if cli.pubout:
|
||
|
|
print('Writing public key to %s' % cli.pubout, file=sys.stderr)
|
||
|
|
data = pub_key.save_pkcs1(format=cli.form)
|
||
|
|
with open(cli.pubout, 'wb') as outfile:
|
||
|
|
outfile.write(data)
|
||
|
|
|
||
|
|
# Save private key
|
||
|
|
data = priv_key.save_pkcs1(format=cli.form)
|
||
|
|
|
||
|
|
if cli.out:
|
||
|
|
print('Writing private key to %s' % cli.out, file=sys.stderr)
|
||
|
|
with open(cli.out, 'wb') as outfile:
|
||
|
|
outfile.write(data)
|
||
|
|
else:
|
||
|
|
print('Writing private key to stdout', file=sys.stderr)
|
||
|
|
sys.stdout.buffer.write(data)
|
||
|
|
|
||
|
|
|
||
|
|
class CryptoOperation(metaclass=abc.ABCMeta):
|
||
|
|
"""CLI callable that operates with input, output, and a key."""
|
||
|
|
|
||
|
|
keyname = 'public' # or 'private'
|
||
|
|
usage = 'usage: %%prog [options] %(keyname)s_key'
|
||
|
|
description = ''
|
||
|
|
operation = 'decrypt'
|
||
|
|
operation_past = 'decrypted'
|
||
|
|
operation_progressive = 'decrypting'
|
||
|
|
input_help = 'Name of the file to %(operation)s. Reads from stdin if ' \
|
||
|
|
'not specified.'
|
||
|
|
output_help = 'Name of the file to write the %(operation_past)s file ' \
|
||
|
|
'to. Written to stdout if this option is not present.'
|
||
|
|
expected_cli_args = 1
|
||
|
|
has_output = True
|
||
|
|
|
||
|
|
key_class = rsa.PublicKey # type: typing.Type[rsa.key.AbstractKey]
|
||
|
|
|
||
|
|
def __init__(self) -> None:
|
||
|
|
self.usage = self.usage % self.__class__.__dict__
|
||
|
|
self.input_help = self.input_help % self.__class__.__dict__
|
||
|
|
self.output_help = self.output_help % self.__class__.__dict__
|
||
|
|
|
||
|
|
@abc.abstractmethod
|
||
|
|
def perform_operation(self, indata: bytes, key: rsa.key.AbstractKey,
|
||
|
|
cli_args: Indexable) -> typing.Any:
|
||
|
|
"""Performs the program's operation.
|
||
|
|
|
||
|
|
Implement in a subclass.
|
||
|
|
|
||
|
|
:returns: the data to write to the output.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __call__(self) -> None:
|
||
|
|
"""Runs the program."""
|
||
|
|
|
||
|
|
(cli, cli_args) = self.parse_cli()
|
||
|
|
|
||
|
|
key = self.read_key(cli_args[0], cli.keyform)
|
||
|
|
|
||
|
|
indata = self.read_infile(cli.input)
|
||
|
|
|
||
|
|
print(self.operation_progressive.title(), file=sys.stderr)
|
||
|
|
outdata = self.perform_operation(indata, key, cli_args)
|
||
|
|
|
||
|
|
if self.has_output:
|
||
|
|
self.write_outfile(outdata, cli.output)
|
||
|
|
|
||
|
|
def parse_cli(self) -> typing.Tuple[optparse.Values, typing.List[str]]:
|
||
|
|
"""Parse the CLI options
|
||
|
|
|
||
|
|
:returns: (cli_opts, cli_args)
|
||
|
|
"""
|
||
|
|
|
||
|
|
parser = optparse.OptionParser(usage=self.usage, description=self.description)
|
||
|
|
|
||
|
|
parser.add_option('-i', '--input', type='string', help=self.input_help)
|
||
|
|
|
||
|
|
if self.has_output:
|
||
|
|
parser.add_option('-o', '--output', type='string', help=self.output_help)
|
||
|
|
|
||
|
|
parser.add_option('--keyform',
|
||
|
|
help='Key format of the %s key - default PEM' % self.keyname,
|
||
|
|
choices=('PEM', 'DER'), default='PEM')
|
||
|
|
|
||
|
|
(cli, cli_args) = parser.parse_args(sys.argv[1:])
|
||
|
|
|
||
|
|
if len(cli_args) != self.expected_cli_args:
|
||
|
|
parser.print_help()
|
||
|
|
raise SystemExit(1)
|
||
|
|
|
||
|
|
return cli, cli_args
|
||
|
|
|
||
|
|
def read_key(self, filename: str, keyform: str) -> rsa.key.AbstractKey:
|
||
|
|
"""Reads a public or private key."""
|
||
|
|
|
||
|
|
print('Reading %s key from %s' % (self.keyname, filename), file=sys.stderr)
|
||
|
|
with open(filename, 'rb') as keyfile:
|
||
|
|
keydata = keyfile.read()
|
||
|
|
|
||
|
|
return self.key_class.load_pkcs1(keydata, keyform)
|
||
|
|
|
||
|
|
def read_infile(self, inname: str) -> bytes:
|
||
|
|
"""Read the input file"""
|
||
|
|
|
||
|
|
if inname:
|
||
|
|
print('Reading input from %s' % inname, file=sys.stderr)
|
||
|
|
with open(inname, 'rb') as infile:
|
||
|
|
return infile.read()
|
||
|
|
|
||
|
|
print('Reading input from stdin', file=sys.stderr)
|
||
|
|
return sys.stdin.buffer.read()
|
||
|
|
|
||
|
|
def write_outfile(self, outdata: bytes, outname: str) -> None:
|
||
|
|
"""Write the output file"""
|
||
|
|
|
||
|
|
if outname:
|
||
|
|
print('Writing output to %s' % outname, file=sys.stderr)
|
||
|
|
with open(outname, 'wb') as outfile:
|
||
|
|
outfile.write(outdata)
|
||
|
|
else:
|
||
|
|
print('Writing output to stdout', file=sys.stderr)
|
||
|
|
sys.stdout.buffer.write(outdata)
|
||
|
|
|
||
|
|
|
||
|
|
class EncryptOperation(CryptoOperation):
|
||
|
|
"""Encrypts a file."""
|
||
|
|
|
||
|
|
keyname = 'public'
|
||
|
|
description = ('Encrypts a file. The file must be shorter than the key '
|
||
|
|
'length in order to be encrypted.')
|
||
|
|
operation = 'encrypt'
|
||
|
|
operation_past = 'encrypted'
|
||
|
|
operation_progressive = 'encrypting'
|
||
|
|
|
||
|
|
def perform_operation(self, indata: bytes, pub_key: rsa.key.AbstractKey,
|
||
|
|
cli_args: Indexable = ()) -> bytes:
|
||
|
|
"""Encrypts files."""
|
||
|
|
assert isinstance(pub_key, rsa.key.PublicKey)
|
||
|
|
return rsa.encrypt(indata, pub_key)
|
||
|
|
|
||
|
|
|
||
|
|
class DecryptOperation(CryptoOperation):
|
||
|
|
"""Decrypts a file."""
|
||
|
|
|
||
|
|
keyname = 'private'
|
||
|
|
description = ('Decrypts a file. The original file must be shorter than '
|
||
|
|
'the key length in order to have been encrypted.')
|
||
|
|
operation = 'decrypt'
|
||
|
|
operation_past = 'decrypted'
|
||
|
|
operation_progressive = 'decrypting'
|
||
|
|
key_class = rsa.PrivateKey
|
||
|
|
|
||
|
|
def perform_operation(self, indata: bytes, priv_key: rsa.key.AbstractKey,
|
||
|
|
cli_args: Indexable = ()) -> bytes:
|
||
|
|
"""Decrypts files."""
|
||
|
|
assert isinstance(priv_key, rsa.key.PrivateKey)
|
||
|
|
return rsa.decrypt(indata, priv_key)
|
||
|
|
|
||
|
|
|
||
|
|
class SignOperation(CryptoOperation):
|
||
|
|
"""Signs a file."""
|
||
|
|
|
||
|
|
keyname = 'private'
|
||
|
|
usage = 'usage: %%prog [options] private_key hash_method'
|
||
|
|
description = ('Signs a file, outputs the signature. Choose the hash '
|
||
|
|
'method from %s' % ', '.join(HASH_METHODS))
|
||
|
|
operation = 'sign'
|
||
|
|
operation_past = 'signature'
|
||
|
|
operation_progressive = 'Signing'
|
||
|
|
key_class = rsa.PrivateKey
|
||
|
|
expected_cli_args = 2
|
||
|
|
|
||
|
|
output_help = ('Name of the file to write the signature to. Written '
|
||
|
|
'to stdout if this option is not present.')
|
||
|
|
|
||
|
|
def perform_operation(self, indata: bytes, priv_key: rsa.key.AbstractKey,
|
||
|
|
cli_args: Indexable) -> bytes:
|
||
|
|
"""Signs files."""
|
||
|
|
assert isinstance(priv_key, rsa.key.PrivateKey)
|
||
|
|
|
||
|
|
hash_method = cli_args[1]
|
||
|
|
if hash_method not in HASH_METHODS:
|
||
|
|
raise SystemExit('Invalid hash method, choose one of %s' %
|
||
|
|
', '.join(HASH_METHODS))
|
||
|
|
|
||
|
|
return rsa.sign(indata, priv_key, hash_method)
|
||
|
|
|
||
|
|
|
||
|
|
class VerifyOperation(CryptoOperation):
|
||
|
|
"""Verify a signature."""
|
||
|
|
|
||
|
|
keyname = 'public'
|
||
|
|
usage = 'usage: %%prog [options] public_key signature_file'
|
||
|
|
description = ('Verifies a signature, exits with status 0 upon success, '
|
||
|
|
'prints an error message and exits with status 1 upon error.')
|
||
|
|
operation = 'verify'
|
||
|
|
operation_past = 'verified'
|
||
|
|
operation_progressive = 'Verifying'
|
||
|
|
key_class = rsa.PublicKey
|
||
|
|
expected_cli_args = 2
|
||
|
|
has_output = False
|
||
|
|
|
||
|
|
def perform_operation(self, indata: bytes, pub_key: rsa.key.AbstractKey,
|
||
|
|
cli_args: Indexable) -> None:
|
||
|
|
"""Verifies files."""
|
||
|
|
assert isinstance(pub_key, rsa.key.PublicKey)
|
||
|
|
|
||
|
|
signature_file = cli_args[1]
|
||
|
|
|
||
|
|
with open(signature_file, 'rb') as sigfile:
|
||
|
|
signature = sigfile.read()
|
||
|
|
|
||
|
|
try:
|
||
|
|
rsa.verify(indata, signature, pub_key)
|
||
|
|
except rsa.VerificationError:
|
||
|
|
raise SystemExit('Verification failed.')
|
||
|
|
|
||
|
|
print('Verification OK', file=sys.stderr)
|
||
|
|
|
||
|
|
|
||
|
|
encrypt = EncryptOperation()
|
||
|
|
decrypt = DecryptOperation()
|
||
|
|
sign = SignOperation()
|
||
|
|
verify = VerifyOperation()
|