diff options
Diffstat (limited to 'marginaltool')
| -rwxr-xr-x | marginaltool | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/marginaltool b/marginaltool new file mode 100755 index 0000000..27730d3 --- /dev/null +++ b/marginaltool @@ -0,0 +1,126 @@ +#!/usr/bin/env python3 + +import argparse +import base64 +import configparser +import json +import os +import pathlib +import subprocess +import sys +import urllib.parse +import getpass + +# use requests instead of urllib.request for keep-alive connection +import requests + +def init(args): + args.params = urllib.parse.parse_qs(args.url.query) + args.access_token = args.params["accessToken"][0] + args.start_token = args.params["startSigningToken"][0] + args.url = args.params['baseUrl'][0] + + # if missing, get options from section [url] in config + config = configparser.ConfigParser() + config.read(os.path.expanduser('~') + '/.marginaltool') + if not args.engine: + args.engine = config.get(args.url, 'engine', fallback='file') + + match args.engine: + case 'file': + if not args.keyfile: + args.keyfile = config.get(args.url, 'keyfile', fallback=None) + if not args.certfile: + args.certfile = config.get(args.url, 'certfile', fallback=None) + if not args.keyfile or not args.certfile: + raise Exception('key or certificate file not specified') + args.cert = ''.join(line.strip() for line in open(args.certfile) if not line.startswith('-----')) + case 'pkcs11': + if not args.id: + args.id = config.get(args.url, 'id', fallback=None) + if not args.id: + raise Exception('key ID not specified') + args.cert = base64.b64encode(subprocess.run(['pkcs11-tool', '--read-object', '--type', 'cert', '--id', args.id], capture_output=True).stdout).decode() + args.pin = getpass.getpass('PIN: ') + case '_': + raise Exception(f'invalid engine {args.engine}') + +def sign(b64data, args): + match args.engine: + case 'file': + if not args.keyfile: + raise Exception('keyfile not specified') + cmd = ['openssl', 'pkeyutl', '-sign', '-inkey', args.keyfile, '-pkeyopt', 'digest:sha256'] + env = None + data = base64.b64decode(b64data) + case 'pkcs11': + if not args.id: + raise Exception('key ID not specified') + digest_info = { # from RFC 3447 + 'MD2': '3020300c06082a864886f70d020205000410', + 'MD5': '3020300c06082a864886f70d020505000410', + 'SHA-1': '3021300906052b0e03021a05000414', + 'SHA-256': '3031300d060960864801650304020105000420', + 'SHA-384': '3041300d060960864801650304020205000430', + 'SHA-512': '3051300d060960864801650304020305000440' + } + cmd = ['pkcs11-tool', '--id', args.id, '-s', '-m', 'RSA-PKCS', '-p', 'env:PIN'] + env = {'PIN': args.pin} + data = bytes.fromhex(digest_info['SHA-256']) + base64.b64decode(b64data) + case '_': + raise Exception(f'invalid engine {args.engine}') + + p = subprocess.run(cmd, env=env, input=data, capture_output=True) + if p.returncode != 0: + raise Exception(f'could not sign data: {p.stderr.decode()}') + + return base64.b64encode(p.stdout).decode() + +if __name__ == '__main__': + parser = argparse.ArgumentParser(description='Fake the MargTools application.') + parser.add_argument('url', type=urllib.parse.urlparse, help='bc-digsign:// url') + parser.add_argument('-e', '--engine', choices=('file', 'pkcs11'), help='use key file or PKCS11 token?') + parser.add_argument('-k', '--keyfile', type=pathlib.Path, help='key file') + parser.add_argument('-c', '--certfile', type=pathlib.Path, help='certificate file') + parser.add_argument('-i', '--id', type=int, metavar='<KEY ID>', help='key ID on PKCS11 token') + args = parser.parse_args() + + try: + # parse query string and load certificates + init(args) + + session = requests.Session() + headers = {'Authorization': f'Bearer {args.access_token}'} + + # delete old signing session + r = session.delete(f'{args.url}/signatures/{args.params["startSigningToken"][0]}', headers=headers) + + # register a certificate or sign a document, makes no difference to us + if args.params.get('registerCertificate'): + q = {'registerCertificate': 1} + else: + q = {'documentId': [i for i in args.params['documentId'][0].split(',')]} + qs = urllib.parse.urlencode(q, doseq=True) + r = session.post(f'{args.url}/signatures?{qs}', headers=headers) + + # get signature request and mix in my secrets and publics + request = json.loads(r.text) + request['AuthenticationToken'] = args.access_token + request['CertificatePublicKey'] = args.cert + + # keep signing whatever they send us + while True: + for name in ('AttachmentHashes', 'XmlHashes'): + if values := request.get(name, []): + request[f'Signed{name}'] = [sign(v, args) for v in values] + + r = session.put(f'{args.url}signatures/{request["SignatureRequestId"]}', + headers=headers | {'Content-Type': 'application/json; charset=utf-8'}, + data=json.dumps(request).encode()) + if not r.text: + break + request |= json.loads(r.text) + + except Exception as ex: + print(f'error: {ex}', file=sys.stderr) + input('press enter to exit') # don’t close terminal immediately on fail |