115 lines
4.5 KiB
Python
Executable file
115 lines
4.5 KiB
Python
Executable file
#!/usr/bin/env python3
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import argparse
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import base64
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import configparser
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import json
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import os
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import pathlib
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import subprocess
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import sys
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import urllib.parse
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import getpass
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# use requests instead of urllib.request for keep-alive connection
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import requests
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def sign(b64data, key, pin=None, engine=None):
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if engine is None:
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# key in file
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cmd = ['openssl', 'pkeyutl', '-sign', '-inkey', key, '-pkeyopt', 'digest:sha256']
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env = None
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data = base64.b64decode(b64data)
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elif engine == 'pkcs11':
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# key on smartcard
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digest_info = { # from RFC 3447
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'MD2': '3020300c06082a864886f70d020205000410',
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'MD5': '3020300c06082a864886f70d020505000410',
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'SHA-1': '3021300906052b0e03021a05000414',
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'SHA-256': '3031300d060960864801650304020105000420',
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'SHA-384': '3041300d060960864801650304020205000430',
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'SHA-512': '3051300d060960864801650304020305000440'
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}
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cmd = ['pkcs11-tool', '--id', key, '-s', '-m', 'RSA-PKCS', '-p', 'env:PIN']
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env = {'PIN': pin}
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data = bytes.fromhex(digest_info['SHA-256']) + base64.b64decode(b64data)
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p = subprocess.run(cmd, env=env, input=data, capture_output=True)
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if p.returncode != 0:
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raise RuntimeError('could not sign data')
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return base64.b64encode(p.stdout).decode()
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if __name__ == '__main__':
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parser = argparse.ArgumentParser(description='Fake the MargTools application.')
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parser.add_argument('url', type=urllib.parse.urlparse, help='bc-digsign:// url')
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parser.add_argument('-e', '--engine', type=str, help='"pkcs11" for smart card')
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parser.add_argument('-k', '--key', type=pathlib.Path, help='key file')
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parser.add_argument('-c', '--cert', type=pathlib.Path, help='certificate file')
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args = parser.parse_args()
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try:
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# parse query string
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params = urllib.parse.parse_qs(args.url.query)
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url = params['baseUrl'][0]
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token = params['accessToken'][0]
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# if missing, get options from section [url] in ~/.margfools
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config = configparser.ConfigParser()
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config.read(os.path.expanduser('~') + '/.margfools')
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if not args.engine:
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args.engine = config.get(url, 'engine', fallback=None)
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if not args.key:
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args.key = config.get(url, 'key')
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if not args.cert:
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args.cert = config.get(url, 'cert', fallback=None)
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if not args.key:
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print('key not specified', file=sys.stderr)
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sys.exit(1)
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pin = None
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if args.engine is None:
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if not args.cert:
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print('certificate not specified', file=sys.stderr)
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sys.exit(1)
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args.cert = ''.join(line.strip() for line in open(args.cert) if not line.startswith('-----'))
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elif args.engine == 'pkcs11':
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args.cert = base64.b64encode(subprocess.run(['pkcs11-tool', '--read-object', '--type', 'cert', '--id', args.key], capture_output=True).stdout).decode()
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pin = getpass.getpass('PIN: ')
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session = requests.Session()
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headers = {'Authorization': f'Bearer {token}'}
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# delete old signing session
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r = session.delete(f'{url}/signatures/{params["startSigningToken"][0]}', headers=headers)
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# register a certificate or sign a document, makes no difference to us
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if params.get('registerCertificate'):
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q = {'registerCertificate': 1}
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else:
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q = {'documentId': [i for i in params['documentId'][0].split(',')]}
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qs = urllib.parse.urlencode(q, doseq=True)
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r = session.post(f'{url}/signatures?{qs}', headers=headers)
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# get signature request and mix in my secrets and publics
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request = json.loads(r.text)
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request['AuthenticationToken'] = token
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request['CertificatePublicKey'] = args.cert
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# keep signing whatever they send us
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while True:
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for name in ('AttachmentHashes', 'XmlHashes'):
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if request.get(name) is not None:
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request[f'Signed{name}'] = [sign(e, args.key, pin, engine=args.engine) for e in request[name]]
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r = session.put(f'{url}signatures/{request["SignatureRequestId"]}',
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headers=headers | {'Content-Type': 'application/json; charset=utf-8'},
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data=json.dumps(request).encode())
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if not r.text:
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break
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request |= json.loads(r.text)
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except Exception as ex:
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print(ex, file=sys.stderr)
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input('press enter to exit') # don’t close terminal immediately on fail
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