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"""A class that performs HTTP-01 challenges for Nginx"""
import logging
from acme import challenges
from acme.magic_typing import List # pylint: disable=unused-import, no-name-in-module
from certbot import errors
from certbot.compat import os
from certbot.plugins import common
from certbot_nginx._internal import nginxparser
from certbot_nginx._internal import obj
logger = logging.getLogger(__name__)
class NginxHttp01(common.ChallengePerformer):
"""HTTP-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. NginxHttp01 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
challenges, possibly of different types, belong in the response
array. This is an optional utility.
"""
def __init__(self, configurator):
super(NginxHttp01, self).__init__(configurator)
self.challenge_conf = os.path.join(
configurator.config.config_dir, "le_http_01_cert_challenge.conf")
def perform(self):
"""Perform a challenge on Nginx.
:returns: list of :class:`certbot.acme.challenges.HTTP01Response`
:rtype: list
"""
if not self.achalls:
return []
responses = [x.response(x.account_key) for x in self.achalls]
# Set up the configuration
self._mod_config()
# Save reversible changes
self.configurator.save("HTTP Challenge", True)
return responses
def _mod_config(self):
"""Modifies Nginx config to include server_names_hash_bucket_size directive
and server challenge blocks.
:raises .MisconfigurationError:
Unable to find a suitable HTTP block in which to include
authenticator hosts.
"""
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 a block to include '
'challenges in %s.' % root)
config = [self._make_or_mod_server_block(achall) for achall in self.achalls]
config = [x for x in config if x is not None]
config = nginxparser.UnspacedList(config)
logger.debug("Generated server block:\n%s", str(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)
def _default_listen_addresses(self):
"""Finds addresses for a challenge block to listen on.
:returns: list of :class:`certbot_nginx._internal.obj.Addr` to apply
:rtype: list
"""
addresses = [] # type: List[obj.Addr]
default_addr = "%s" % self.configurator.config.http01_port
ipv6_addr = "[::]:{0}".format(
self.configurator.config.http01_port)
port = self.configurator.config.http01_port
ipv6, ipv6only = self.configurator.ipv6_info(port)
if ipv6:
# If IPv6 is active in Nginx configuration
if not ipv6only:
# If ipv6only=on is not already present in the config
ipv6_addr = ipv6_addr + " ipv6only=on"
addresses = [obj.Addr.fromstring(default_addr),
obj.Addr.fromstring(ipv6_addr)]
logger.info(("Using default addresses %s and %s for authentication."),
default_addr,
ipv6_addr)
else:
addresses = [obj.Addr.fromstring(default_addr)]
logger.info("Using default address %s for authentication.",
default_addr)
return addresses
def _get_validation_path(self, achall):
return os.sep + os.path.join(challenges.HTTP01.URI_ROOT_PATH, achall.chall.encode("token"))
def _make_server_block(self, achall):
"""Creates a server block for a challenge.
:param achall: Annotated HTTP-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
"""
addrs = self._default_listen_addresses()
block = [['listen', ' ', addr.to_string(include_default=False)] for addr in addrs]
# Ensure we 404 on any other request by setting a root
document_root = os.path.join(
self.configurator.config.work_dir, "http_01_nonexistent")
block.extend([['server_name', ' ', achall.domain],
['root', ' ', document_root],
self._location_directive_for_achall(achall)
])
# TODO: do we want to return something else if they otherwise access this block?
return [['server'], block]
def _location_directive_for_achall(self, achall):
validation = achall.validation(achall.account_key)
validation_path = self._get_validation_path(achall)
location_directive = [['location', ' ', '=', ' ', validation_path],
[['default_type', ' ', 'text/plain'],
['return', ' ', '200', ' ', validation]]]
return location_directive
def _make_or_mod_server_block(self, achall):
"""Modifies a server block to respond to a challenge.
:param achall: Annotated HTTP-01 challenge
:type achall:
:class:`certbot.achallenges.KeyAuthorizationAnnotatedChallenge`
"""
try:
vhosts = self.configurator.choose_redirect_vhosts(achall.domain,
'%i' % self.configurator.config.http01_port, create_if_no_match=True)
except errors.MisconfigurationError:
# Couldn't find either a matching name+port server block
# or a port+default_server block, so create a dummy block
return self._make_server_block(achall)
# len is max 1 because Nginx doesn't authenticate wildcards
# if len were or vhosts None, we would have errored
vhost = vhosts[0]
# Modify existing server block
location_directive = [self._location_directive_for_achall(achall)]
self.configurator.parser.add_server_directives(vhost,
location_directive)
rewrite_directive = [['rewrite', ' ', '^(/.well-known/acme-challenge/.*)',
' ', '$1', ' ', 'break']]
self.configurator.parser.add_server_directives(vhost,
rewrite_directive, insert_at_top=True)
return None
|
