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"""A class that performs TLS-SNI-01 challenges for Nginx"""
import logging
import os
import six
from certbot import errors
from certbot.plugins import common
from certbot_nginx import obj
from certbot_nginx import nginxparser
logger = logging.getLogger(__name__)
class NginxTlsSni01(common.TLSSNI01):
"""TLS-SNI-01 authenticator for Nginx
:ivar configurator: NginxConfigurator object
:type configurator: :class:`~nginx.configurator.NginxConfigurator`
:ivar list achalls: Annotated
class:`~certbot.achallenges.KeyAuthorizationAnnotatedChallenge`
challenges
:param list indices: Meant to hold indices of challenges in a
larger array. NginxTlsSni01 is capable of solving many challenges
at once which causes an indexing issue within NginxConfigurator
who must return all responses in order. Imagine NginxConfigurator
maintaining state about where all of the http-01 Challenges,
TLS-SNI-01 Challenges belong in the response array. This is an
optional utility.
:param str challenge_conf: location of the challenge config file
"""
def perform(self):
"""Perform a challenge on Nginx.
:returns: list of :class:`certbot.acme.challenges.TLSSNI01Response`
:rtype: list
"""
if not self.achalls:
return []
addresses = []
default_addr = "{0} ssl".format(
self.configurator.config.tls_sni_01_port)
for achall in self.achalls:
vhosts = self.configurator.choose_vhosts(achall.domain, create_if_no_match=True)
# len is max 1 because Nginx doesn't authenticate wildcards
if vhosts and vhosts[0].addrs:
addresses.append(list(vhosts[0].addrs))
else:
# choose_vhosts might have modified vhosts, so put this after
ipv6, ipv6only = self.configurator.ipv6_info(
self.configurator.config.tls_sni_01_port)
if ipv6:
# If IPv6 is active in Nginx configuration
ipv6_addr = "[::]:{0} ssl".format(
self.configurator.config.tls_sni_01_port)
if not ipv6only:
# If ipv6only=on is not already present in the config
ipv6_addr = ipv6_addr + " ipv6only=on"
addresses.append([obj.Addr.fromstring(default_addr),
obj.Addr.fromstring(ipv6_addr)])
logger.info(("Using default addresses %s and %s for " +
"TLSSNI01 authentication."),
default_addr,
ipv6_addr)
else:
addresses.append([obj.Addr.fromstring(default_addr)])
logger.info("Using default address %s for TLSSNI01 authentication.",
default_addr)
# Create challenge certs
responses = [self._setup_challenge_cert(x) for x in self.achalls]
# Set up the configuration
self._mod_config(addresses)
# Save reversible changes
self.configurator.save("SNI Challenge", True)
return responses
def _mod_config(self, ll_addrs):
"""Modifies Nginx config to include challenge server blocks.
:param list ll_addrs: list of lists of
:class:`certbot_nginx.obj.Addr` to apply
:raises .MisconfigurationError:
Unable to find a suitable HTTP block in which to include
authenticator hosts.
"""
# Add the 'include' statement for the challenges if it doesn't exist
# already in the main config
included = False
include_directive = ['\n', 'include', ' ', self.challenge_conf]
root = self.configurator.parser.config_root
bucket_directive = ['\n', 'server_names_hash_bucket_size', ' ', '128']
main = self.configurator.parser.parsed[root]
for line in main:
if line[0] == ['http']:
body = line[1]
found_bucket = False
posn = 0
for inner_line in body:
if inner_line[0] == bucket_directive[1]:
if int(inner_line[1]) < int(bucket_directive[3]):
body[posn] = bucket_directive
found_bucket = True
posn += 1
if not found_bucket:
body.insert(0, bucket_directive)
if include_directive not in body:
body.insert(0, include_directive)
included = True
break
if not included:
raise errors.MisconfigurationError(
'Certbot could not find an HTTP block to include '
'TLS-SNI-01 challenges in %s.' % root)
config = [self._make_server_block(pair[0], pair[1])
for pair in six.moves.zip(self.achalls, ll_addrs)]
config = nginxparser.UnspacedList(config)
self.configurator.reverter.register_file_creation(
True, self.challenge_conf)
with open(self.challenge_conf, "w") as new_conf:
nginxparser.dump(config, new_conf)
logger.debug("Generated server block:\n%s", str(config))
def _make_server_block(self, achall, addrs):
"""Creates a server block for a challenge.
:param achall: Annotated TLS-SNI-01 challenge
:type achall:
:class:`certbot.achallenges.KeyAuthorizationAnnotatedChallenge`
:param list addrs: addresses of challenged domain
:class:`list` of type :class:`~nginx.obj.Addr`
:returns: server block for the challenge host
:rtype: list
"""
document_root = os.path.join(
self.configurator.config.work_dir, "tls_sni_01_page")
block = [['listen', ' ', addr.to_string(include_default=False)] for addr in addrs]
block.extend([['server_name', ' ',
achall.response(achall.account_key).z_domain.decode('ascii')],
# access and error logs necessary for
# integration testing (non-root)
['access_log', ' ', os.path.join(
self.configurator.config.work_dir, 'access.log')],
['error_log', ' ', os.path.join(
self.configurator.config.work_dir, 'error.log')],
['ssl_certificate', ' ', self.get_cert_path(achall)],
['ssl_certificate_key', ' ', self.get_key_path(achall)],
['include', ' ', self.configurator.mod_ssl_conf],
[['location', ' ', '/'], [['root', ' ', document_root]]]])
return [['server'], block]
|
