/usr/lib/python3/dist-packages/certbot_nginx/http_01.py is in python3-certbot-nginx 0.23.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | """A class that performs HTTP-01 challenges for Nginx"""
import logging
import os
from acme import challenges
from certbot import errors
from certbot.plugins import common
from certbot_nginx import obj
from certbot_nginx import nginxparser
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 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")
self._ipv6 = None
self._ipv6only = None
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)
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 = []
default_addr = "%s" % self.configurator.config.http01_port
ipv6_addr = "[::]:{0}".format(
self.configurator.config.http01_port)
port = self.configurator.config.http01_port
if self._ipv6 is None or self._ipv6only is None:
self._ipv6, self._ipv6only = self.configurator.ipv6_info(port)
ipv6, ipv6only = self._ipv6, self._ipv6only
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)
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