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Code Issues Releases Wiki Activity

ssl_certificates: reuse query_dns function in status_checks and simplify calls by calling normalize_ip within query_dns

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This commit is contained in:
Joshua Tauberer 2018-05-12 17:24:16 -04:00
parent f9a0e39cc9
commit 8be23d5ef6
2 changed files with 16 additions and 48 deletions
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32
management/ssl_certificates.py
View File

@ -213,41 +213,17 @@ def get_certificates_to_provision(env, show_extended_problems=True, force_domain
# Filter out domains that we can't provision a certificate for.
def can_provision_for_domain(domain):
from status_checks import normalize_ip
from status_checks import query_dns, 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))
response = query_dns(domain, rtype)
if response != normalize_ip(value):
problems[domain] = "The domain name does not resolve to this machine: DNS %s resolved to %s." % (rtype, response)
return False
return True

32
management/status_checks.py
View File

@ -393,7 +393,7 @@ def check_primary_hostname_dns(domain, env, output, dns_domains, dns_zonefiles):
# Check that PRIMARY_HOSTNAME resolves to PUBLIC_IP[V6] in public DNS.
ipv6 = query_dns(domain, "AAAA") if env.get("PUBLIC_IPV6") else None
if ip == env['PUBLIC_IP'] and not (ipv6 and env['PUBLIC_IPV6'] and normalize_ip(ipv6) != normalize_ip(env['PUBLIC_IPV6'])):
if ip == env['PUBLIC_IP'] and not (ipv6 and env['PUBLIC_IPV6'] and ipv6 != normalize_ip(env['PUBLIC_IPV6'])):
output.print_ok("Domain resolves to box's IP address. [%s ↦ %s]" % (env['PRIMARY_HOSTNAME'], my_ips))
else:
output.print_error("""This domain must resolve to your box's IP address (%s) in public DNS but it currently resolves
@ -640,7 +640,7 @@ def check_web_domain(domain, rounded_time, ssl_certificates, env, output):
for (rtype, expected) in (("A", env['PUBLIC_IP']), ("AAAA", env.get('PUBLIC_IPV6'))):
if not expected: continue # IPv6 is not configured
value = query_dns(domain, rtype)
if normalize_ip(value) == normalize_ip(expected):
if value == normalize_ip(expected):
ok_values.append(value)
else:
output.print_error("""This domain should resolve to your box's IP address (%s %s) if you would like the box to serve
@ -687,27 +687,17 @@ def query_dns(qname, rtype, nxdomain='[Not Set]', at=None):
except dns.exception.Timeout:
return "[timeout]"
# Normalize IP addresses. IP address --- especially IPv6 addresses --- can
# be expressed in equivalent string forms. Canonicalize the form before
# returning them. The caller should normalize any IP addresses the result
# of this method is compared with.
if rtype in ("A", "AAAA"):
response = [normalize_ip(str(r)) for r in response]
# There may be multiple answers; concatenate the response. Remove trailing
# periods from responses since that's how qnames are encoded in DNS but is
# confusing for us. The order of the answers doesn't matter, so sort so we
# can compare to a well known order.
# 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
response_new = []
for r in response:
s = r.to_text()
if isinstance(s, bytes):
s = s.decode('utf-8')
response_new.append(s)
response = response_new
# END HOTFIX
return "; ".join(sorted(str(r).rstrip('.') for r in response))
def check_ssl_cert(domain, rounded_time, ssl_certificates, env, output):
@ -892,7 +882,9 @@ def run_and_output_changes(env, pool):
json.dump(cur.buf, f, indent=True)
def normalize_ip(ip):
# Use ipaddress module to normalize the IPv6 notation and ensure we are matching IPv6 addresses written in different representations according to rfc5952.
# Use ipaddress module to normalize the IPv6 notation and
# ensure we are matching IPv6 addresses written in different
# representations according to rfc5952.
import ipaddress
try:
return str(ipaddress.ip_address(ip))