810 lines
30 KiB
Python
Executable File
810 lines
30 KiB
Python
Executable File
#!/usr/bin/python3
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# Utilities for installing and selecting SSL certificates.
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import os, os.path, re, shutil
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from utils import shell, safe_domain_name, sort_domains
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import idna
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# SELECTING SSL CERTIFICATES FOR USE IN WEB
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def get_ssl_certificates(env):
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# Scan all of the installed SSL certificates and map every domain
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# that the certificates are good for to the best certificate for
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# the domain.
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from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
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from cryptography.x509 import Certificate
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# The certificates are all stored here:
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ssl_root = os.path.join(env["STORAGE_ROOT"], 'ssl')
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# List all of the files in the SSL directory and one level deep.
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def get_file_list():
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if not os.path.exists(ssl_root):
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return
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for fn in os.listdir(ssl_root):
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fn = os.path.join(ssl_root, fn)
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if os.path.isfile(fn):
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yield fn
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elif os.path.isdir(fn):
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for fn1 in os.listdir(fn):
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fn1 = os.path.join(fn, fn1)
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if os.path.isfile(fn1):
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yield fn1
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# Remember stuff.
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private_keys = { }
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certificates = [ ]
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# Scan each of the files to find private keys and certificates.
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# We must load all of the private keys first before processing
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# certificates so that we can check that we have a private key
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# available before using a certificate.
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for fn in get_file_list():
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try:
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pem = load_pem(load_cert_chain(fn)[0])
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except ValueError:
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# Not a valid PEM format for a PEM type we care about.
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continue
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# Remember where we got this object.
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pem._filename = fn
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# Is it a private key?
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if isinstance(pem, RSAPrivateKey):
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private_keys[pem.public_key().public_numbers()] = pem
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# Is it a certificate?
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if isinstance(pem, Certificate):
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certificates.append(pem)
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# Process the certificates.
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domains = { }
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for cert in certificates:
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# What domains is this certificate good for?
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cert_domains, primary_domain = get_certificate_domains(cert)
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cert._primary_domain = primary_domain
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# Is there a private key file for this certificate?
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private_key = private_keys.get(cert.public_key().public_numbers())
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if not private_key:
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continue
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cert._private_key = private_key
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# Add this cert to the list of certs usable for the domains.
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for domain in cert_domains:
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domains.setdefault(domain, []).append(cert)
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# Sort the certificates to prefer good ones.
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import datetime
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now = datetime.datetime.utcnow()
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ret = { }
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for domain, cert_list in domains.items():
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cert_list.sort(key = lambda cert : (
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# must be valid NOW
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cert.not_valid_before <= now <= cert.not_valid_after,
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# prefer one that is not self-signed
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cert.issuer != cert.subject,
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###########################################################
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# The above lines ensure that valid certificates are chosen
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# over invalid certificates. The lines below choose between
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# multiple valid certificates available for this domain.
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###########################################################
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# prefer one with the expiration furthest into the future so
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# that we can easily rotate to new certs as we get them
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cert.not_valid_after,
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###########################################################
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# We always choose the certificate that is good for the
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# longest period of time. This is important for how we
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# provision certificates for Let's Encrypt. To ensure that
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# we don't re-provision every night, we have to ensure that
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# if we choose to provison a certificate that it will
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# *actually* be used so the provisioning logic knows it
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# doesn't still need to provision a certificate for the
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# domain.
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###########################################################
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# in case a certificate is installed in multiple paths,
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# prefer the... lexicographically last one?
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cert._filename,
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), reverse=True)
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cert = cert_list.pop(0)
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ret[domain] = {
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"private-key": cert._private_key._filename,
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"certificate": cert._filename,
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"primary-domain": cert._primary_domain,
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"certificate_object": cert,
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}
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return ret
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def get_domain_ssl_files(domain, ssl_certificates, env, allow_missing_cert=False, raw=False):
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# Get the system certificate info.
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ssl_private_key = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_private_key.pem'))
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ssl_certificate = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_certificate.pem'))
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system_certificate = {
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"private-key": ssl_private_key,
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"certificate": ssl_certificate,
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"primary-domain": env['PRIMARY_HOSTNAME'],
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"certificate_object": load_pem(load_cert_chain(ssl_certificate)[0]),
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}
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if domain == env['PRIMARY_HOSTNAME']:
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# The primary domain must use the server certificate because
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# it is hard-coded in some service configuration files.
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return system_certificate
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wildcard_domain = re.sub("^[^\.]+", "*", domain)
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if domain in ssl_certificates:
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return ssl_certificates[domain]
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elif wildcard_domain in ssl_certificates:
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return ssl_certificates[wildcard_domain]
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elif not allow_missing_cert:
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# No valid certificate is available for this domain! Return default files.
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return system_certificate
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else:
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# No valid certificate is available for this domain.
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return None
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# PROVISIONING CERTIFICATES FROM LETSENCRYPT
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def get_certificates_to_provision(env, show_extended_problems=True, force_domains=None):
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# Get a set of domain names that we should now provision certificates
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# for. Provision if a domain name has no valid certificate or if any
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# certificate is expiring in 14 days. If provisioning anything, also
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# provision certificates expiring within 30 days. The period between
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# 14 and 30 days allows us to consolidate domains into multi-domain
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# certificates for domains expiring around the same time.
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from web_update import get_web_domains
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import datetime
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now = datetime.datetime.utcnow()
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# Get domains with missing & expiring certificates.
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certs = get_ssl_certificates(env)
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domains = set()
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domains_if_any = set()
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problems = { }
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for domain in get_web_domains(env):
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# If the user really wants a cert for certain domains, include it.
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if force_domains:
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if force_domains == "ALL" or (isinstance(force_domains, list) and domain in force_domains):
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domains.add(domain)
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continue
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# Include this domain if its certificate is missing, self-signed, or expiring soon.
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try:
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cert = get_domain_ssl_files(domain, certs, env, allow_missing_cert=True)
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except FileNotFoundError as e:
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# system certificate is not present
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problems[domain] = "Error: " + str(e)
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continue
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if cert is None:
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# No valid certificate available.
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domains.add(domain)
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else:
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cert = cert["certificate_object"]
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if cert.issuer == cert.subject:
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# This is self-signed. Get a real one.
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domains.add(domain)
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# Valid certificate today, but is it expiring soon?
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elif cert.not_valid_after-now < datetime.timedelta(days=14):
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domains.add(domain)
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elif cert.not_valid_after-now < datetime.timedelta(days=30):
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domains_if_any.add(domain)
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# It's valid. Should we report its validness?
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elif show_extended_problems:
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problems[domain] = "The certificate is valid for at least another 30 days --- no need to replace."
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# Warn the user about domains hosted elsewhere.
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if not force_domains and show_extended_problems:
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for domain in set(get_web_domains(env, exclude_dns_elsewhere=False)) - set(get_web_domains(env)):
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problems[domain] = "The domain's DNS is pointed elsewhere, so there is no point to installing a TLS certificate here and we could not automatically provision one anyway because provisioning requires access to the website (which isn't here)."
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# Filter out domains that we can't provision a certificate for.
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def can_provision_for_domain(domain):
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from status_checks import normalize_ip
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# Let's Encrypt doesn't yet support IDNA domains.
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# We store domains in IDNA (ASCII). To see if this domain is IDNA,
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# we'll see if its IDNA-decoded form is different.
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if idna.decode(domain.encode("ascii")) != domain:
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problems[domain] = "Let's Encrypt does not yet support provisioning certificates for internationalized domains."
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return False
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# Does the domain resolve to this machine in public DNS? If not,
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# we can't do domain control validation. For IPv6 is configured,
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# make sure both IPv4 and IPv6 are correct because we don't know
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# how Let's Encrypt will connect.
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import dns.resolver
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for rtype, value in [("A", env["PUBLIC_IP"]), ("AAAA", env.get("PUBLIC_IPV6"))]:
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if not value: continue # IPv6 is not configured
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try:
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# Must make the qname absolute to prevent a fall-back lookup with a
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# search domain appended, by adding a period to the end.
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response = dns.resolver.query(domain + ".", rtype)
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except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer) as e:
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problems[domain] = "DNS isn't configured properly for this domain: DNS resolution failed (%s: %s)." % (rtype, str(e) or repr(e)) # NoAnswer's str is empty
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return False
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except Exception as e:
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problems[domain] = "DNS isn't configured properly for this domain: DNS lookup had an error: %s." % str(e)
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return False
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# Unfortunately, the response.__str__ returns bytes
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# instead of string, if it resulted from an AAAA-query.
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# We need to convert manually, until this is fixed:
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# https://github.com/rthalley/dnspython/issues/204
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#
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# BEGIN HOTFIX
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def rdata__str__(r):
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s = r.to_text()
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if isinstance(s, bytes):
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s = s.decode('utf-8')
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return s
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# END HOTFIX
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if len(response) != 1 or normalize_ip(rdata__str__(response[0])) != normalize_ip(value):
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problems[domain] = "Domain control validation cannot be performed for this domain because DNS points the domain to another machine (%s %s)." % (rtype, ", ".join(rdata__str__(r) for r in response))
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return False
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return True
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domains = set(filter(can_provision_for_domain, domains))
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# If there are any domains we definitely will provision for, add in
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# additional domains to do at this time.
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if len(domains) > 0:
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domains |= set(filter(can_provision_for_domain, domains_if_any))
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return (domains, problems)
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def provision_certificates(env, agree_to_tos_url=None, logger=None, show_extended_problems=True, force_domains=None, jsonable=False):
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import requests.exceptions
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import acme.messages
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from free_tls_certificates import client
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# What domains should we provision certificates for? And what
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# errors prevent provisioning for other domains.
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domains, problems = get_certificates_to_provision(env, force_domains=force_domains, show_extended_problems=show_extended_problems)
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# Exit fast if there is nothing to do.
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if len(domains) == 0:
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return {
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"requests": [],
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"problems": problems,
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}
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# Break into groups of up to 100 certificates at a time, which is Let's Encrypt's
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# limit for a single certificate. We'll sort to put related domains together.
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domains = sort_domains(domains, env)
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certs = []
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while len(domains) > 0:
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certs.append( domains[0:100] )
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domains = domains[100:]
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# Prepare to provision.
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# Where should we put our Let's Encrypt account info and state cache.
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account_path = os.path.join(env['STORAGE_ROOT'], 'ssl/lets_encrypt')
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if not os.path.exists(account_path):
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os.mkdir(account_path)
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# Where should we put ACME challenge files. This is mapped to /.well-known/acme_challenge
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# by the nginx configuration.
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challenges_path = os.path.join(account_path, 'acme_challenges')
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if not os.path.exists(challenges_path):
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os.mkdir(challenges_path)
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# Read in the private key that we use for all TLS certificates. We'll need that
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# to generate a CSR (done by free_tls_certificates).
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with open(os.path.join(env['STORAGE_ROOT'], 'ssl/ssl_private_key.pem'), 'rb') as f:
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private_key = f.read()
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# Provision certificates.
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ret = []
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for domain_list in certs:
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# For return.
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ret_item = {
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"domains": domain_list,
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"log": [],
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}
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ret.append(ret_item)
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# Logging for free_tls_certificates.
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def my_logger(message):
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if logger: logger(message)
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ret_item["log"].append(message)
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# Attempt to provision a certificate.
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try:
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try:
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cert = client.issue_certificate(
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domain_list,
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account_path,
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agree_to_tos_url=agree_to_tos_url,
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private_key=private_key,
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logger=my_logger)
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except client.NeedToTakeAction as e:
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# Write out the ACME challenge files.
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for action in e.actions:
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if isinstance(action, client.NeedToInstallFile):
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fn = os.path.join(challenges_path, action.file_name)
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with open(fn, 'w') as f:
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f.write(action.contents)
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else:
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raise ValueError(str(action))
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# Try to provision now that the challenge files are installed.
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cert = client.issue_certificate(
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domain_list,
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account_path,
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private_key=private_key,
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logger=my_logger)
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except client.NeedToAgreeToTOS as e:
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# The user must agree to the Let's Encrypt terms of service agreement
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# before any further action can be taken.
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ret_item.update({
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"result": "agree-to-tos",
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"url": e.url,
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})
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except client.WaitABit as e:
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# We need to hold on for a bit before querying again to see if we can
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# acquire a provisioned certificate.
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import time, datetime
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ret_item.update({
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"result": "wait",
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"until": e.until_when if not jsonable else e.until_when.isoformat(),
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"seconds": (e.until_when - datetime.datetime.now()).total_seconds()
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})
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except client.AccountDataIsCorrupt as e:
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# This is an extremely rare condition.
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ret_item.update({
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"result": "error",
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"message": "Something unexpected went wrong. It looks like your local Let's Encrypt account data is corrupted. There was a problem with the file " + e.account_file_path + ".",
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})
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except (client.InvalidDomainName, client.NeedToTakeAction, client.ChallengeFailed, client.RateLimited, acme.messages.Error, requests.exceptions.RequestException) as e:
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ret_item.update({
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"result": "error",
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"message": "Something unexpected went wrong: " + str(e),
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})
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else:
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# A certificate was issued.
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install_status = install_cert(domain_list[0], cert['cert'].decode("ascii"), b"\n".join(cert['chain']).decode("ascii"), env, raw=True)
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# str indicates the certificate was not installed.
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if isinstance(install_status, str):
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ret_item.update({
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"result": "error",
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"message": "Something unexpected was wrong with the provisioned certificate: " + install_status,
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})
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else:
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# A list indicates success and what happened next.
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ret_item["log"].extend(install_status)
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ret_item.update({
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"result": "installed",
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})
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# Return what happened with each certificate request.
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return {
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"requests": ret,
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"problems": problems,
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}
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def provision_certificates_cmdline():
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import sys
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from exclusiveprocess import Lock
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from utils import load_environment
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Lock(die=True).forever()
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env = load_environment()
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verbose = False
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headless = False
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force_domains = None
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show_extended_problems = True
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args = list(sys.argv)
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args.pop(0) # program name
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if args and args[0] == "-v":
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verbose = True
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args.pop(0)
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if args and args[0] == "-q":
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show_extended_problems = False
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args.pop(0)
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if args and args[0] == "--headless":
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headless = True
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args.pop(0)
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if args and args[0] == "--force":
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force_domains = "ALL"
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args.pop(0)
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else:
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force_domains = args
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agree_to_tos_url = None
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while True:
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# Run the provisioning script. This installs certificates. If there are
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# a very large number of domains on this box, it issues separate
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# certificates for groups of domains. We have to check the result for
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# each group.
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def my_logger(message):
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if verbose:
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print(">", message)
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status = provision_certificates(env, agree_to_tos_url=agree_to_tos_url, logger=my_logger, force_domains=force_domains, show_extended_problems=show_extended_problems)
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agree_to_tos_url = None # reset to prevent infinite looping
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if not status["requests"]:
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# No domains need certificates.
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if not headless or verbose:
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if len(status["problems"]) == 0:
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print("No domains hosted on this box need a new TLS certificate at this time.")
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elif len(status["problems"]) > 0:
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print("No TLS certificates could be provisoned at this time:")
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print()
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for domain in sort_domains(status["problems"], env):
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print("%s: %s" % (domain, status["problems"][domain]))
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sys.exit(0)
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# What happened?
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wait_until = None
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wait_domains = []
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for request in status["requests"]:
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if request["result"] == "agree-to-tos":
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# We may have asked already in a previous iteration.
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if agree_to_tos_url is not None:
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continue
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# Can't ask the user a question in this mode. Warn the user that something
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# needs to be done.
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if headless:
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print(", ".join(request["domains"]) + " need a new or renewed TLS certificate.")
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print()
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print("This box can't do that automatically for you until you agree to Let's Encrypt's")
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print("Terms of Service agreement. Use the Mail-in-a-Box control panel to provision")
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print("certificates for these domains.")
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sys.exit(1)
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print("""
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I'm going to provision a TLS certificate (formerly called a SSL certificate)
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for you from Let's Encrypt (letsencrypt.org).
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TLS certificates are cryptographic keys that ensure communication between
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you and this box are secure when getting and sending mail and visiting
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websites hosted on this box. Let's Encrypt is a free provider of TLS
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certificates.
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Please open this document in your web browser:
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%s
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It is Let's Encrypt's terms of service agreement. If you agree, I can
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provision that TLS certificate. If you don't agree, you will have an
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opportunity to install your own TLS certificate from the Mail-in-a-Box
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control panel.
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Do you agree to the agreement? Type Y or N and press <ENTER>: """
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% request["url"], end='', flush=True)
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if sys.stdin.readline().strip().upper() != "Y":
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print("\nYou didn't agree. Quitting.")
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sys.exit(1)
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# Okay, indicate agreement on next iteration.
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agree_to_tos_url = request["url"]
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if request["result"] == "wait":
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# Must wait. We'll record until when. The wait occurs below.
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if wait_until is None:
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wait_until = request["until"]
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else:
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wait_until = max(wait_until, request["until"])
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wait_domains += request["domains"]
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if request["result"] == "error":
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print(", ".join(request["domains"]) + ":")
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print(request["message"])
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if request["result"] == "installed":
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print("A TLS certificate was successfully installed for " + ", ".join(request["domains"]) + ".")
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if wait_until:
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# Wait, then loop.
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import time, datetime
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print()
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print("A TLS certificate was requested for: " + ", ".join(wait_domains) + ".")
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first = True
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while wait_until > datetime.datetime.now():
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if not headless or first:
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print ("We have to wait", int(round((wait_until - datetime.datetime.now()).total_seconds())), "seconds for the certificate to be issued...")
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time.sleep(10)
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first = False
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continue # Loop!
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if agree_to_tos_url:
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# The user agrees to the TOS. Loop to try again by agreeing.
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continue # Loop!
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# Unless we were instructed to wait, or we just agreed to the TOS,
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# we're done for now.
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break
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# And finally show the domains with problems.
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if len(status["problems"]) > 0:
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print("TLS certificates could not be provisoned for:")
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for domain in sort_domains(status["problems"], env):
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print("%s: %s" % (domain, status["problems"][domain]))
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# INSTALLING A NEW CERTIFICATE FROM THE CONTROL PANEL
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def create_csr(domain, ssl_key, country_code, env):
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return shell("check_output", [
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"openssl", "req", "-new",
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"-key", ssl_key,
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"-sha256",
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"-subj", "/C=%s/ST=/L=/O=/CN=%s" % (country_code, domain)])
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def install_cert(domain, ssl_cert, ssl_chain, env, raw=False):
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# Write the combined cert+chain to a temporary path and validate that it is OK.
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# The certificate always goes above the chain.
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import tempfile
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fd, fn = tempfile.mkstemp('.pem')
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os.write(fd, (ssl_cert + '\n' + ssl_chain).encode("ascii"))
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os.close(fd)
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# Do validation on the certificate before installing it.
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ssl_private_key = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_private_key.pem'))
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cert_status, cert_status_details = check_certificate(domain, fn, ssl_private_key)
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if cert_status != "OK":
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if cert_status == "SELF-SIGNED":
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cert_status = "This is a self-signed certificate. I can't install that."
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os.unlink(fn)
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if cert_status_details is not None:
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cert_status += " " + cert_status_details
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return cert_status
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# Where to put it?
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# Make a unique path for the certificate.
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from cryptography.hazmat.primitives import hashes
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from binascii import hexlify
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cert = load_pem(load_cert_chain(fn)[0])
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all_domains, cn = get_certificate_domains(cert)
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path = "%s-%s-%s.pem" % (
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safe_domain_name(cn), # common name, which should be filename safe because it is IDNA-encoded, but in case of a malformed cert make sure it's ok to use as a filename
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cert.not_valid_after.date().isoformat().replace("-", ""), # expiration date
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hexlify(cert.fingerprint(hashes.SHA256())).decode("ascii")[0:8], # fingerprint prefix
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)
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ssl_certificate = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', path))
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# Install the certificate.
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os.makedirs(os.path.dirname(ssl_certificate), exist_ok=True)
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shutil.move(fn, ssl_certificate)
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ret = ["OK"]
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# When updating the cert for PRIMARY_HOSTNAME, symlink it from the system
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# certificate path, which is hard-coded for various purposes, and then
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# restart postfix and dovecot.
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if domain == env['PRIMARY_HOSTNAME']:
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# Update symlink.
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system_ssl_certificate = os.path.join(os.path.join(env["STORAGE_ROOT"], 'ssl', 'ssl_certificate.pem'))
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os.unlink(system_ssl_certificate)
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os.symlink(ssl_certificate, system_ssl_certificate)
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# Restart postfix and dovecot so they pick up the new file.
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shell('check_call', ["/usr/sbin/service", "postfix", "restart"])
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shell('check_call', ["/usr/sbin/service", "dovecot", "restart"])
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ret.append("mail services restarted")
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# The DANE TLSA record will remain valid so long as the private key
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# hasn't changed. We don't ever change the private key automatically.
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# If the user does it, they must manually update DNS.
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# Update the web configuration so nginx picks up the new certificate file.
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from web_update import do_web_update
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ret.append( do_web_update(env) )
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if raw: return ret
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return "\n".join(ret)
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# VALIDATION OF CERTIFICATES
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def check_certificate(domain, ssl_certificate, ssl_private_key, warn_if_expiring_soon=True, rounded_time=False, just_check_domain=False):
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# Check that the ssl_certificate & ssl_private_key files are good
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# for the provided domain.
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from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
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from cryptography.x509 import Certificate
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# The ssl_certificate file may contain a chain of certificates. We'll
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# need to split that up before we can pass anything to openssl or
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# parse them in Python. Parse it with the cryptography library.
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try:
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ssl_cert_chain = load_cert_chain(ssl_certificate)
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cert = load_pem(ssl_cert_chain[0])
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if not isinstance(cert, Certificate): raise ValueError("This is not a certificate file.")
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except ValueError as e:
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return ("There is a problem with the certificate file: %s" % str(e), None)
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# First check that the domain name is one of the names allowed by
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# the certificate.
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if domain is not None:
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certificate_names, cert_primary_name = get_certificate_domains(cert)
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# Check that the domain appears among the acceptable names, or a wildcard
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# form of the domain name (which is a stricter check than the specs but
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# should work in normal cases).
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wildcard_domain = re.sub("^[^\.]+", "*", domain)
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if domain not in certificate_names and wildcard_domain not in certificate_names:
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return ("The certificate is for the wrong domain name. It is for %s."
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% ", ".join(sorted(certificate_names)), None)
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# Second, check that the certificate matches the private key.
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if ssl_private_key is not None:
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try:
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priv_key = load_pem(open(ssl_private_key, 'rb').read())
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except ValueError as e:
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return ("The private key file %s is not a private key file: %s" % (ssl_private_key, str(e)), None)
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if not isinstance(priv_key, RSAPrivateKey):
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return ("The private key file %s is not a private key file." % ssl_private_key, None)
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if priv_key.public_key().public_numbers() != cert.public_key().public_numbers():
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return ("The certificate does not correspond to the private key at %s." % ssl_private_key, None)
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# We could also use the openssl command line tool to get the modulus
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# listed in each file. The output of each command below looks like "Modulus=XXXXX".
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# $ openssl rsa -inform PEM -noout -modulus -in ssl_private_key
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# $ openssl x509 -in ssl_certificate -noout -modulus
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# Third, check if the certificate is self-signed. Return a special flag string.
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if cert.issuer == cert.subject:
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return ("SELF-SIGNED", None)
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# When selecting which certificate to use for non-primary domains, we check if the primary
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# certificate or a www-parent-domain certificate is good for the domain. There's no need
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# to run extra checks beyond this point.
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if just_check_domain:
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return ("OK", None)
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# Check that the certificate hasn't expired. The datetimes returned by the
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# certificate are 'naive' and in UTC. We need to get the current time in UTC.
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import datetime
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now = datetime.datetime.utcnow()
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if not(cert.not_valid_before <= now <= cert.not_valid_after):
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return ("The certificate has expired or is not yet valid. It is valid from %s to %s." % (cert.not_valid_before, cert.not_valid_after), None)
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# Next validate that the certificate is valid. This checks whether the certificate
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# is self-signed, that the chain of trust makes sense, that it is signed by a CA
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# that Ubuntu has installed on this machine's list of CAs, and I think that it hasn't
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# expired.
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# The certificate chain has to be passed separately and is given via STDIN.
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# This command returns a non-zero exit status in most cases, so trap errors.
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retcode, verifyoutput = shell('check_output', [
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"openssl",
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"verify", "-verbose",
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"-purpose", "sslserver", "-policy_check",]
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+ ([] if len(ssl_cert_chain) == 1 else ["-untrusted", "/proc/self/fd/0"])
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+ [ssl_certificate],
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input=b"\n\n".join(ssl_cert_chain[1:]),
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trap=True)
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if "self signed" in verifyoutput:
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# Certificate is self-signed. Probably we detected this above.
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return ("SELF-SIGNED", None)
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elif retcode != 0:
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if "unable to get local issuer certificate" in verifyoutput:
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return ("The certificate is missing an intermediate chain or the intermediate chain is incorrect or incomplete. (%s)" % verifyoutput, None)
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# There is some unknown problem. Return the `openssl verify` raw output.
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return ("There is a problem with the certificate.", verifyoutput.strip())
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else:
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# `openssl verify` returned a zero exit status so the cert is currently
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# good.
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# But is it expiring soon?
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cert_expiration_date = cert.not_valid_after
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ndays = (cert_expiration_date-now).days
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if not rounded_time or ndays <= 10:
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# Yikes better renew soon!
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expiry_info = "The certificate expires in %d days on %s." % (ndays, cert_expiration_date.strftime("%x"))
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else:
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# We'll renew it with Lets Encrypt.
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expiry_info = "The certificate expires on %s." % cert_expiration_date.strftime("%x")
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if ndays <= 10 and warn_if_expiring_soon:
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# Warn on day 10 to give 4 days for us to automatically renew the
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# certificate, which occurs on day 14.
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return ("The certificate is expiring soon: " + expiry_info, None)
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# Return the special OK code.
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return ("OK", expiry_info)
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def load_cert_chain(pemfile):
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# A certificate .pem file may contain a chain of certificates.
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# Load the file and split them apart.
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re_pem = rb"(-+BEGIN (?:.+)-+[\r\n]+(?:[A-Za-z0-9+/=]{1,64}[\r\n]+)+-+END (?:.+)-+[\r\n]+)"
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with open(pemfile, "rb") as f:
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pem = f.read() + b"\n" # ensure trailing newline
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pemblocks = re.findall(re_pem, pem)
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if len(pemblocks) == 0:
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raise ValueError("File does not contain valid PEM data.")
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return pemblocks
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def load_pem(pem):
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# Parse a "---BEGIN .... END---" PEM string and return a Python object for it
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# using classes from the cryptography package.
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from cryptography.x509 import load_pem_x509_certificate
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.backends import default_backend
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pem_type = re.match(b"-+BEGIN (.*?)-+[\r\n]", pem)
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if pem_type is None:
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raise ValueError("File is not a valid PEM-formatted file.")
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pem_type = pem_type.group(1)
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if pem_type in (b"RSA PRIVATE KEY", b"PRIVATE KEY"):
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return serialization.load_pem_private_key(pem, password=None, backend=default_backend())
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if pem_type == b"CERTIFICATE":
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return load_pem_x509_certificate(pem, default_backend())
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raise ValueError("Unsupported PEM object type: " + pem_type.decode("ascii", "replace"))
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def get_certificate_domains(cert):
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from cryptography.x509 import DNSName, ExtensionNotFound, OID_COMMON_NAME, OID_SUBJECT_ALTERNATIVE_NAME
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import idna
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names = set()
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cn = None
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# The domain may be found in the Subject Common Name (CN). This comes back as an IDNA (ASCII)
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# string, which is the format we store domains in - so good.
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try:
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cn = cert.subject.get_attributes_for_oid(OID_COMMON_NAME)[0].value
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names.add(cn)
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except IndexError:
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# No common name? Certificate is probably generated incorrectly.
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# But we'll let it error-out when it doesn't find the domain.
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pass
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# ... or be one of the Subject Alternative Names. The cryptography library handily IDNA-decodes
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# the names for us. We must encode back to ASCII, but wildcard certificates can't pass through
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# IDNA encoding/decoding so we must special-case. See https://github.com/pyca/cryptography/pull/2071.
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def idna_decode_dns_name(dns_name):
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if dns_name.startswith("*."):
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return "*." + idna.encode(dns_name[2:]).decode('ascii')
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else:
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return idna.encode(dns_name).decode('ascii')
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try:
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sans = cert.extensions.get_extension_for_oid(OID_SUBJECT_ALTERNATIVE_NAME).value.get_values_for_type(DNSName)
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for san in sans:
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names.add(idna_decode_dns_name(san))
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except ExtensionNotFound:
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pass
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return names, cn
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if __name__ == "__main__":
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# Provision certificates.
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provision_certificates_cmdline()
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