X-Git-Url: https://git.ralfj.de/lets-encrypt-tiny.git/blobdiff_plain/c263f7ab1e7c2904cb36a2cad9b73b3bc23e24b8..refs/heads/master:/letsencrypt-tiny diff --git a/letsencrypt-tiny b/letsencrypt-tiny index f849008..eef52e7 100755 --- a/letsencrypt-tiny +++ b/letsencrypt-tiny @@ -1,5 +1,5 @@ #!/usr/bin/env python3 -## Call with "--help" for documentation. +## See for documentation. import argparse, configparser, itertools, stat, os, os.path, sys, subprocess, datetime @@ -19,18 +19,15 @@ def keyfile(name): global config return os.path.join(config['dirs']['keys'], name + ".key") -def csrfile(name): - global config - return os.path.join(config['dirs']['csrs'], name + ".csr") - def make_backup(fname): if os.path.exists(fname): + os.makedirs(config['dirs']['backups'], exist_ok = True) backupname = os.path.basename(fname) + "." + str(datetime.date.today()) i = 0 while True: backupfile = os.path.join(config['dirs']['backups'], backupname + "." + str(i)) if not os.path.exists(backupfile): - os.rename(src = fname, dst = backupfile) + os.rename(fname, backupfile) break elif i >= 100: print("Somehow it's really hard to find a name for the backup file...") @@ -39,7 +36,7 @@ def make_backup(fname): def trigger_hook(hook): global config - exe = config['hooks'][hook] + exe = config['hooks'].get(hook) if exe is not None: subprocess.check_call([exe]) @@ -50,84 +47,98 @@ def cert_expiry(name): from certcheck import cert_expiry_date return cert_expiry_date(certfile(name)) +## Work functions, operating on file names + ## The interesting work -def acme(name, domains): +def acme(keyfilename, certfilename, domains): global config + accountkey = config['acme']['account-key'] + csrfilename = certfilename + '.csr.tmp' + assert os.path.exists(keyfilename) + assert accountkey # Generating the CSR is done by a shell script exe = os.path.join(os.path.dirname(__file__), 'gencsr') - csr = subprocess.check_output([exe, keyfile(name)] + domains) - with open(csrfile(name), 'wb') as file: + csr = subprocess.check_output([exe, keyfilename] + domains) + assert not os.path.exists(csrfilename), "The temporary CSR file {} still exists. It seems something went wrong on a previous request. You may want to remove the file manually.".format(csrfilename) + with open(csrfilename, 'wb') as file: file.write(csr) - # call acme-tiny as a script - acme_tiny = os.path.join(config['acme']['acme-tiny'], 'acme_tiny.py') - signed_crt = subprocess.check_output(["python", acme_tiny, "--quiet", "--account-key", config['acme']['account-key'], "--csr", csrfile(name), "--acme-dir", config['acme']['challenge-dir']]) - # save new certificate - make_backup(certfile(name)) - with open(certfile(name), 'wb') as f: - f.write(signed_crt) + try: + # call acme-tiny as a script + acme_tiny = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'acme-tiny', 'acme_tiny.py') + signed_crt = subprocess.check_output(["python3", acme_tiny, "--quiet", "--account-key", accountkey, "--csr", csrfilename, "--acme-dir", config['acme']['challenge-dir']]) + # save new certificate + make_backup(certfilename) + with open(certfilename, 'wb') as f: + f.write(signed_crt) + finally: + # clean up + os.remove(csrfilename) +def openssl_genrsa(keyfilename): + with subprocess.Popen(["openssl", "genrsa", str(int(config['DEFAULT']['key-length']))], stdout=subprocess.PIPE, stderr=subprocess.PIPE) as f: + (stdout, stderr) = f.communicate() + if f.returncode: + sys.stderr.write(stderr) + raise Exception("Error while generating private key") + # Now we have a key, save it. This should never overwrite anything. + assert not os.path.exists(keyfilename) + with open(keyfilename, 'wb') as f: + f.write(stdout) + +## High-level functions, operating on nice key names def request_cert(name): global config if not os.path.exists(keyfile(name)): raise Exception("No such key: {}".format(name)) domains = config['DEFAULT']['domains'].split() print("Obtaining certificate '{}' for domains: {}".format(name, ' '.join(domains))) - acme(name, domains) + acme(keyfile(name), certfile(name), domains) def generate_key(name): + assert not os.path.exists(certfile(name)), "Don't make create a new key for an old cert" print("Generating new private key '{}'".format(name)) - with subprocess.Popen(["openssl", "genrsa", str(int(config['DEFAULT']['key-length']))], stdout=subprocess.PIPE, stderr=subprocess.PIPE) as f: - (stdout, stderr) = f.communicate() - if f.returncode: - sys.stderr.write(stderr) - raise Exception("Error while generating private key") - # now we have a key, save it - make_backup(keyfile(name)) - with open(keyfile(name), 'wb') as f: - f.write(stdout) + openssl_genrsa(keyfile(name)) -def check_staging(): +def check_staging(live, staging): '''Returns 0 if nothing was done, 1 if a stage key is present but has to be kept, 2 is a stage key was unstaged.''' - live = config['files']['live'] - staging = config['files'].get('staging') - if staging is None or not os.path.exists(keyfile(staging)): + if not os.path.exists(keyfile(staging)): return 0 - staging_time = datetime.timedelta(hours = int(config['timing']['staging-hours'])) + staging_time = datetime.timedelta(hours = int(config['timing'].get('staging-hours', 0))) key_age = datetime.datetime.now() - key_mtime(staging) if key_age < staging_time: return 1 print("Unstaging '{}' to '{}'".format(staging, live)) # unstage the key! make_backup(keyfile(live)) - os.rename(src = keyfile(staging), dst = keyfile(live)) + os.rename(keyfile(staging), keyfile(live)) make_backup(certfile(live)) - os.rename(src = certfile(staging), dst = certfile(live)) + os.rename(certfile(staging), certfile(live)) return 2 -def auto_renewal(): +def auto_renewal(live, staging): '''Returns 0 if nothing was done, 1 if only certs were changed, 2 if certs and keys were changed.''' - live = config['files']['live'] - staging = config['files'].get('staging') - max_key_age = datetime.timedelta(days = int(config['timing']['max-key-age-days'])) renew_cert_time = datetime.timedelta(days = int(config['timing']['renew-cert-before-expiry-days'])) # determine what to do now = datetime.datetime.now() key_age = now - key_mtime(live) - cert_validity = cert_expiry(live) - now need_new_key = key_age >= max_key_age - need_new_cert = cert_validity <= renew_cert_time + if os.path.exists(certfile(live)): + cert_validity = cert_expiry(live) - now + need_new_cert = cert_validity <= renew_cert_time + else: + need_new_cert = True if need_new_cert and key_age + renew_cert_time >= max_key_age: # We are about to request a new certificate, and within , we need a new key: Get the new key now need_new_key = True # Do it if need_new_key: - new_key_name = (live if staging is None else staging) - generate_key(new_key_name) - request_cert(new_key_name) + generate_key(staging) + request_cert(staging) + check_staging(live, staging) # we may want to immediately enable the new key & cert return 2 elif need_new_cert: request_cert(live) @@ -149,34 +160,33 @@ if __name__ == "__main__": help="The action to perform. Possible values: init, renew, cron") args = parser.parse_args() - # read config + # read config, sanity check if not os.path.isfile(args.config): raise Exception("The config file does not exist: "+args.config) global config config = readConfig(args.config) + live = config['files']['live'] + staging = config['files']['staging'] if args.action[0] == 'renew': - live = config['files']['live'] - staging = config['files'].get('staging') - request_cert(live) - if staging is not None and os.path.exists(keyfile(staging)): + if os.path.exists(keyfile(staging)) and os.path.exists(certfile(staging)): request_cert(staging) # trigger the "new cert" hook if args.hooks: trigger_hook('post-certchange') elif args.action[0] == 'cron': # First, check if we need to unstage a staging key - unstaged = check_staging() + unstaged = check_staging(live, staging) if unstaged >= 1: - # A staging eky is present, do *not* check for renewal + # A staging key is present, do *not* check for renewal if unstaged >= 2 and args.hooks: # trigger all the hooks trigger_hook('post-certchange') trigger_hook('post-keychange') else: # Check if we need to renew anything - renewed = auto_renewal() + renewed = auto_renewal(live, staging) if args.hooks: if renewed >= 1: trigger_hook('post-certchange') @@ -187,14 +197,19 @@ if __name__ == "__main__": try: os.makedirs(config['dirs']['certs'], mode = 0o755, exist_ok = True) os.makedirs(config['dirs']['keys'], mode = 0o710, exist_ok = True) - os.makedirs(config['dirs']['csrs'], mode = 0o755, exist_ok = True) os.makedirs(config['dirs']['backups'], mode = 0o700, exist_ok = True) except OSError: pass + # if necessary, generate ACME account key + accountkey = config['acme']['account-key'] + if not os.path.exists(accountkey): + print("Generating new ACME key") + openssl_genrsa(accountkey) # if necessary, generate key + certificate live = config['files']['live'] if not os.path.exists(keyfile(live)): generate_key(live) + if not os.path.exists(certfile(live)): request_cert(live) if args.hooks: trigger_hook('post-certchange')