#!/usr/bin/env python3 # Based on github.com/diafygi/acme-tiny, original copyright: # Copyright Daniel Roesler, under MIT license, see LICENSE at github.com/diafygi/acme-tiny import argparse, subprocess, json, os, sys, base64, binascii, time, hashlib, re, copy, textwrap, logging try: from urllib.request import urlopen, Request # Python 3 except ImportError: # pragma: no cover from urllib2 import urlopen, Request # Python 2 DEFAULT_DIRECTORY_URL = "https://acme-v02.api.letsencrypt.org/directory" LOGGER = logging.getLogger(__name__) LOGGER.addHandler(logging.StreamHandler()) LOGGER.setLevel(logging.INFO) def get_id(account_key, log=LOGGER, directory_url=DEFAULT_DIRECTORY_URL, contact=None): directory, acct_headers, alg, jwk = None, None, None, None # global variables # helper functions - base64 encode for jose spec def _b64(b): return base64.urlsafe_b64encode(b).decode('utf8').replace("=", "") # helper function - run external commands def _cmd(cmd_list, stdin=None, cmd_input=None, err_msg="Command Line Error"): proc = subprocess.Popen(cmd_list, stdin=stdin, stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = proc.communicate(cmd_input) if proc.returncode != 0: raise IOError("{0}\n{1}".format(err_msg, err)) return out # helper function - make request and automatically parse json response def _do_request(url, data=None, err_msg="Error", depth=0): try: resp = urlopen(Request(url, data=data, headers={"Content-Type": "application/jose+json", "User-Agent": "acme-tiny"})) resp_data, code, headers = resp.read().decode("utf8"), resp.getcode(), resp.headers except IOError as e: resp_data = e.read().decode("utf8") if hasattr(e, "read") else str(e) code, headers = getattr(e, "code", None), {} try: resp_data = json.loads(resp_data) # try to parse json results except ValueError: pass # ignore json parsing errors if depth < 100 and code == 400 and resp_data['type'] == "urn:ietf:params:acme:error:badNonce": raise IndexError(resp_data) # allow 100 retrys for bad nonces if code not in [200, 201, 204]: raise ValueError("{0}:\nUrl: {1}\nData: {2}\nResponse Code: {3}\nResponse: {4}".format(err_msg, url, data, code, resp_data)) return resp_data, code, headers # helper function - make signed requests def _send_signed_request(url, payload, err_msg, depth=0): payload64 = "" if payload is None else _b64(json.dumps(payload).encode('utf8')) new_nonce = _do_request(directory['newNonce'])[2]['Replay-Nonce'] protected = {"url": url, "alg": alg, "nonce": new_nonce} protected.update({"jwk": jwk} if acct_headers is None else {"kid": acct_headers['Location']}) protected64 = _b64(json.dumps(protected).encode('utf8')) protected_input = "{0}.{1}".format(protected64, payload64).encode('utf8') out = _cmd(["openssl", "dgst", "-sha256", "-sign", account_key], stdin=subprocess.PIPE, cmd_input=protected_input, err_msg="OpenSSL Error") data = json.dumps({"protected": protected64, "payload": payload64, "signature": _b64(out)}) try: return _do_request(url, data=data.encode('utf8'), err_msg=err_msg, depth=depth) except IndexError: # retry bad nonces (they raise IndexError) return _send_signed_request(url, payload, err_msg, depth=(depth + 1)) # helper function - poll until complete def _poll_until_not(url, pending_statuses, err_msg): result, t0 = None, time.time() while result is None or result['status'] in pending_statuses: assert (time.time() - t0 < 3600), "Polling timeout" # 1 hour timeout time.sleep(0 if result is None else 2) result, _, _ = _send_signed_request(url, None, err_msg) return result # parse account key to get public key log.info("Parsing account key...") out = _cmd(["openssl", "rsa", "-in", account_key, "-noout", "-text"], err_msg="OpenSSL Error") pub_pattern = r"modulus:[\s]+?00:([a-f0-9\:\s]+?)\npublicExponent: ([0-9]+)" pub_hex, pub_exp = re.search(pub_pattern, out.decode('utf8'), re.MULTILINE|re.DOTALL).groups() pub_exp = "{0:x}".format(int(pub_exp)) pub_exp = "0{0}".format(pub_exp) if len(pub_exp) % 2 else pub_exp alg, jwk = "RS256", { "e": _b64(binascii.unhexlify(pub_exp.encode("utf-8"))), "kty": "RSA", "n": _b64(binascii.unhexlify(re.sub(r"(\s|:)", "", pub_hex).encode("utf-8"))), } accountkey_json = json.dumps(jwk, sort_keys=True, separators=(',', ':')) thumbprint = _b64(hashlib.sha256(accountkey_json.encode('utf8')).digest()) # get the ACME directory of urls log.info("Getting directory...") directory, _, _ = _do_request(directory_url, err_msg="Error getting directory") log.info("Directory found!") # create account and get the global key identifier log.info("Registering account...") reg_payload = {"termsOfServiceAgreed": True} if contact is None else {"termsOfServiceAgreed": True, "contact": contact} account, code, acct_headers = _send_signed_request(directory['newAccount'], reg_payload, "Error registering") log.info("Registered!" if code == 201 else "Already registered!") return acct_headers['Location'] def main(argv=None): parser = argparse.ArgumentParser( formatter_class=argparse.RawDescriptionHelpFormatter, description=textwrap.dedent("""\ Generate a CAA record for Mailcow. Example Usage: python mailcow_gencaa.py --account-key data/assets/ssl/acme/account.pem """) ) parser.add_argument("--account-key", required=True, help="path to your Let's Encrypt account private key") parser.add_argument("--quiet", action="store_const", const=logging.ERROR, help="suppress output except for errors") parser.add_argument("--directory-url", default=DEFAULT_DIRECTORY_URL, help="certificate authority directory url, default is Let's Encrypt") parser.add_argument("--contact", metavar="CONTACT", default=None, nargs="*", help="Contact details (e.g. mailto:aaa@bbb.com) for your account-key") args = parser.parse_args(argv) LOGGER.setLevel(args.quiet or LOGGER.level) id = get_id(args.account_key, log=LOGGER, directory_url=args.directory_url, contact=args.contact) print("Use this as your CAA record:") print('issue 128 "letsencrypt.org;accounturi={}"'.format(id)) if __name__ == "__main__": # pragma: no cover main(sys.argv[1:])