def can_provision_for_domain(domain):
from status_checks import normalize_ip
# Let's Encrypt doesn't yet support IDNA domains.
# We store domains in IDNA (ASCII). To see if this domain is IDNA,
# we'll see if its IDNA-decoded form is different.
if idna.decode(domain.encode("ascii")) != domain:
problems[
domain] = "Let's Encrypt does not yet support provisioning certificates for internationalized domains."
return False
# Does the domain resolve to this machine in public DNS? If not,
# we can't do domain control validation. For IPv6 is configured,
# make sure both IPv4 and IPv6 are correct because we don't know
# how Let's Encrypt will connect.
import dns.resolver
for rtype, value in [("A", env["PUBLIC_IP"]),
("AAAA", env.get("PUBLIC_IPV6"))]:
if not value: continue # IPv6 is not configured
try:
# Must make the qname absolute to prevent a fall-back lookup with a
# search domain appended, by adding a period to the end.
response = dns.resolver.query(domain + ".", rtype)
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN,
dns.resolver.NoAnswer) as e:
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
return False
except Exception as e:
problems[
domain] = "DNS isn't configured properly for this domain: DNS lookup had an error: %s." % str(
e)
return False
# Unfortunately, the response.__str__ returns bytes
# instead of string, if it resulted from an AAAA-query.
# We need to convert manually, until this is fixed:
# https://github.com/rthalley/dnspython/issues/204
#
# BEGIN HOTFIX
def rdata__str__(r):
s = r.to_text()
if isinstance(s, bytes):
s = s.decode('utf-8')
return s
# END HOTFIX
if len(response) != 1 or normalize_ip(rdata__str__(
response[0])) != normalize_ip(value):
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))
return False
return True
def can_provision_for_domain(domain):
from status_checks import normalize_ip
# Does the domain resolve to this machine in public DNS? If not,
# we can't do domain control validation. For IPv6 is configured,
# make sure both IPv4 and IPv6 are correct because we don't know
# how Let's Encrypt will connect.
import dns.resolver
for rtype, value in [("A", env["PUBLIC_IP"]), ("AAAA", env.get("PUBLIC_IPV6"))]:
if not value: continue # IPv6 is not configured
try:
# Must make the qname absolute to prevent a fall-back lookup with a
# search domain appended, by adding a period to the end.
response = dns.resolver.query(domain + ".", rtype)
except (dns.resolver.NoNameservers, dns.resolver.NXDOMAIN, dns.resolver.NoAnswer) as e:
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
return False
except Exception as e:
problems[domain] = "DNS isn't configured properly for this domain: DNS lookup had an error: %s." % str(e)
return False
# Unfortunately, the response.__str__ returns bytes
# instead of string, if it resulted from an AAAA-query.
# We need to convert manually, until this is fixed:
# https://github.com/rthalley/dnspython/issues/204
#
# BEGIN HOTFIX
def rdata__str__(r):
s = r.to_text()
if isinstance(s, bytes):
s = s.decode('utf-8')
return s
# END HOTFIX
if len(response) != 1 or normalize_ip(rdata__str__(response[0])) != normalize_ip(value):
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))
return False
return True
def get_certificates_to_provision(env,
limit_domains=None,
show_valid_certs=True):
# Get a set of domain names that we can provision certificates for
# using certbot. We start with domains that the box is serving web
# for and subtract:
# * domains not in limit_domains if limit_domains is not empty
# * domains with custom "A" records, i.e. they are hosted elsewhere
# * domains with actual "A" records that point elsewhere (misconfiguration)
# * domains that already have certificates that will be valid for a while
from web_update import get_web_domains
from status_checks import query_dns, normalize_ip
existing_certs = get_ssl_certificates(env)
plausible_web_domains = get_web_domains(env, exclude_dns_elsewhere=False)
actual_web_domains = get_web_domains(env)
domains_to_provision = set()
domains_cant_provision = {}
for domain in plausible_web_domains:
# Skip domains that the user doesn't want to provision now.
if limit_domains and domain not in limit_domains:
continue
# Check that there isn't an explicit A/AAAA record.
if domain not in actual_web_domains:
domains_cant_provision[
domain] = "The domain has a custom DNS A/AAAA record that points the domain 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)."
# Check that the DNS resolves to here.
else:
# Does the domain resolve to this machine in public DNS? If not,
# we can't do domain control validation. For IPv6 is configured,
# make sure both IPv4 and IPv6 are correct because we don't know
# how Let's Encrypt will connect.
bad_dns = []
for rtype, value in [("A", env["PUBLIC_IP"]),
("AAAA", env.get("PUBLIC_IPV6"))]:
if not value: continue # IPv6 is not configured
response = query_dns(domain, rtype)
if response != normalize_ip(value):
bad_dns.append("%s (%s)" % (response, rtype))
if bad_dns:
domains_cant_provision[domain] = "The domain name does not resolve to this machine: " \
+ (", ".join(bad_dns)) \
+ "."
else:
# DNS is all good.
# Check for a good existing cert.
existing_cert = get_domain_ssl_files(domain,
existing_certs,
env,
use_main_cert=False,
allow_missing_cert=True)
if existing_cert:
existing_cert_check = check_certificate(
domain,
existing_cert['certificate'],
existing_cert['private-key'],
warn_if_expiring_soon=14)
if existing_cert_check[0] == "OK":
if show_valid_certs:
domains_cant_provision[
domain] = "The domain has a valid certificate already. ({} Certificate: {}, private key {})".format(
existing_cert_check[1],
existing_cert['certificate'],
existing_cert['private-key'])
continue
domains_to_provision.add(domain)
return (domains_to_provision, domains_cant_provision)
def get_certificates_to_provision(env, limit_domains=None, show_valid_certs=True):
# Get a set of domain names that we can provision certificates for
# using certbot. We start with domains that the box is serving web
# for and subtract:
# * domains not in limit_domains if limit_domains is not empty
# * domains with custom "A" records, i.e. they are hosted elsewhere
# * domains with actual "A" records that point elsewhere
# * domains that already have certificates that will be valid for a while
from web_update import get_web_domains
from status_checks import query_dns, normalize_ip
existing_certs = get_ssl_certificates(env)
plausible_web_domains = get_web_domains(env, exclude_dns_elsewhere=False)
actual_web_domains = get_web_domains(env)
domains_to_provision = set()
domains_cant_provision = { }
for domain in plausible_web_domains:
# Skip domains that the user doesn't want to provision now.
if limit_domains and domain not in limit_domains:
continue
# Check that there isn't an explicit A/AAAA record.
if domain not in actual_web_domains:
domains_cant_provision[domain] = "The domain has a custom DNS A/AAAA record that points the domain 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)."
# Check that the DNS resolves to here.
else:
# Does the domain resolve to this machine in public DNS? If not,
# we can't do domain control validation. For IPv6 is configured,
# make sure both IPv4 and IPv6 are correct because we don't know
# how Let's Encrypt will connect.
bad_dns = []
for rtype, value in [("A", env["PUBLIC_IP"]), ("AAAA", env.get("PUBLIC_IPV6"))]:
if not value: continue # IPv6 is not configured
response = query_dns(domain, rtype)
if response != normalize_ip(value):
bad_dns.append("%s (%s)" % (response, rtype))
if bad_dns:
domains_cant_provision[domain] = "The domain name does not resolve to this machine: " \
+ (", ".join(bad_dns)) \
+ "."
else:
# DNS is all good.
# Check for a good existing cert.
existing_cert = get_domain_ssl_files(domain, existing_certs, env, use_main_cert=False, allow_missing_cert=True)
if existing_cert:
existing_cert_check = check_certificate(domain, existing_cert['certificate'], existing_cert['private-key'],
warn_if_expiring_soon=14)
if existing_cert_check[0] == "OK":
if show_valid_certs:
domains_cant_provision[domain] = "The domain has a valid certificate already. ({} Certificate: {}, private key {})".format(
existing_cert_check[1],
existing_cert['certificate'],
existing_cert['private-key'])
continue
domains_to_provision.add(domain)
return (domains_to_provision, domains_cant_provision)
