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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 http-01 Challenges, TLS-SNI-01 Challenges 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.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)