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Merge pull request #760 from matrix-org/matthew/preview_url_ip_whitelist

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add a url_preview_ip_range_whitelist config param
This commit is contained in:
Matthew Hodgson 2016-05-16 13:13:26 +01:00
parent c0112fabc2 eb79110beb
commit 2d98c960ec
4 changed files with 57 additions and 41 deletions
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18
synapse/config/repository.py
View file

@ -100,8 +100,13 @@ class ContentRepositoryConfig(Config):
"to work"
)
if "url_preview_url_blacklist" in config:
self.url_preview_url_blacklist = config["url_preview_url_blacklist"]
self.url_preview_ip_range_whitelist = IPSet(
config.get("url_preview_ip_range_whitelist", ())
)
self.url_preview_url_blacklist = config.get(
"url_preview_url_blacklist", ()
)
def default_config(self, **kwargs):
media_store = self.default_path("media_store")
@ -162,6 +167,15 @@ class ContentRepositoryConfig(Config):
# - '10.0.0.0/8'
# - '172.16.0.0/12'
# - '192.168.0.0/16'
#
# List of IP address CIDR ranges that the URL preview spider is allowed
# to access even if they are specified in url_preview_ip_range_blacklist.
# This is useful for specifying exceptions to wide-ranging blacklisted
# target IP ranges - e.g. for enabling URL previews for a specific private
# website only visible in your network.
#
# url_preview_ip_range_whitelist:
# - '192.168.1.1'
# Optional list of URL matches that the URL preview spider is
# denied from accessing. You should use url_preview_ip_range_blacklist

5
synapse/http/client.py
View file

@ -380,13 +380,14 @@ class CaptchaServerHttpClient(SimpleHttpClient):
class SpiderEndpointFactory(object):
def __init__(self, hs):
self.blacklist = hs.config.url_preview_ip_range_blacklist
self.whitelist = hs.config.url_preview_ip_range_whitelist
self.policyForHTTPS = hs.get_http_client_context_factory()
def endpointForURI(self, uri):
logger.info("Getting endpoint for %s", uri.toBytes())
if uri.scheme == "http":
return SpiderEndpoint(
reactor, uri.host, uri.port, self.blacklist,
reactor, uri.host, uri.port, self.blacklist, self.whitelist,
endpoint=TCP4ClientEndpoint,
endpoint_kw_args={
'timeout': 15
@ -395,7 +396,7 @@ class SpiderEndpointFactory(object):
elif uri.scheme == "https":
tlsPolicy = self.policyForHTTPS.creatorForNetloc(uri.host, uri.port)
return SpiderEndpoint(
reactor, uri.host, uri.port, self.blacklist,
reactor, uri.host, uri.port, self.blacklist, self.whitelist,
endpoint=SSL4ClientEndpoint,
endpoint_kw_args={
'sslContextFactory': tlsPolicy,

14
synapse/http/endpoint.py
View file

@ -79,12 +79,13 @@ class SpiderEndpoint(object):
"""An endpoint which refuses to connect to blacklisted IP addresses
Implements twisted.internet.interfaces.IStreamClientEndpoint.
"""
def __init__(self, reactor, host, port, blacklist,
def __init__(self, reactor, host, port, blacklist, whitelist,
endpoint=TCP4ClientEndpoint, endpoint_kw_args={}):
self.reactor = reactor
self.host = host
self.port = port
self.blacklist = blacklist
self.whitelist = whitelist
self.endpoint = endpoint
self.endpoint_kw_args = endpoint_kw_args
@ -93,10 +94,13 @@ class SpiderEndpoint(object):
address = yield self.reactor.resolve(self.host)
from netaddr import IPAddress
if IPAddress(address) in self.blacklist:
raise ConnectError(
"Refusing to spider blacklisted IP address %s" % address
)
ip_address = IPAddress(address)
if ip_address in self.blacklist:
if self.whitelist is None or ip_address not in self.whitelist:
raise ConnectError(
"Refusing to spider blacklisted IP address %s" % address
)
logger.info("Connecting to %s:%s", address, self.port)
endpoint = self.endpoint(

61
synapse/rest/media/v1/preview_url_resource.py
View file

@ -56,8 +56,7 @@ class PreviewUrlResource(Resource):
self.client = SpiderHttpClient(hs)
self.media_repo = media_repo
if hasattr(hs.config, "url_preview_url_blacklist"):
self.url_preview_url_blacklist = hs.config.url_preview_url_blacklist
self.url_preview_url_blacklist = hs.config.url_preview_url_blacklist
# simple memory cache mapping urls to OG metadata
self.cache = ExpiringCache(
@ -86,39 +85,37 @@ class PreviewUrlResource(Resource):
else:
ts = self.clock.time_msec()
# impose the URL pattern blacklist
if hasattr(self, "url_preview_url_blacklist"):
url_tuple = urlparse.urlsplit(url)
for entry in self.url_preview_url_blacklist:
match = True
for attrib in entry:
pattern = entry[attrib]
value = getattr(url_tuple, attrib)
logger.debug((
"Matching attrib '%s' with value '%s' against"
" pattern '%s'"
) % (attrib, value, pattern))
url_tuple = urlparse.urlsplit(url)
for entry in self.url_preview_url_blacklist:
match = True
for attrib in entry:
pattern = entry[attrib]
value = getattr(url_tuple, attrib)
logger.debug((
"Matching attrib '%s' with value '%s' against"
" pattern '%s'"
) % (attrib, value, pattern))
if value is None:
if value is None:
match = False
continue
if pattern.startswith('^'):
if not re.match(pattern, getattr(url_tuple, attrib)):
match = False
continue
if pattern.startswith('^'):
if not re.match(pattern, getattr(url_tuple, attrib)):
match = False
continue
else:
if not fnmatch.fnmatch(getattr(url_tuple, attrib), pattern):
match = False
continue
if match:
logger.warn(
"URL %s blocked by url_blacklist entry %s", url, entry
)
raise SynapseError(
403, "URL blocked by url pattern blacklist entry",
Codes.UNKNOWN
)
else:
if not fnmatch.fnmatch(getattr(url_tuple, attrib), pattern):
match = False
continue
if match:
logger.warn(
"URL %s blocked by url_blacklist entry %s", url, entry
)
raise SynapseError(
403, "URL blocked by url pattern blacklist entry",
Codes.UNKNOWN
)
# first check the memory cache - good to handle all the clients on this
# HS thundering away to preview the same URL at the same time.