diff options
Diffstat (limited to 'synapse/http/client.py')
| -rw-r--r-- | synapse/http/client.py | 119 |
1 files changed, 55 insertions, 64 deletions
diff --git a/synapse/http/client.py b/synapse/http/client.py index c9479c81ff..f1ab7a8bc9 100644 --- a/synapse/http/client.py +++ b/synapse/http/client.py @@ -117,22 +117,22 @@ RawHeaderValue = Union[ ] -def check_against_blacklist( - ip_address: IPAddress, ip_whitelist: Optional[IPSet], ip_blacklist: IPSet +def _is_ip_blocked( + ip_address: IPAddress, allowlist: Optional[IPSet], blocklist: IPSet ) -> bool: """ Compares an IP address to allowed and disallowed IP sets. Args: ip_address: The IP address to check - ip_whitelist: Allowed IP addresses. - ip_blacklist: Disallowed IP addresses. + allowlist: Allowed IP addresses. + blocklist: Disallowed IP addresses. Returns: - True if the IP address is in the blacklist and not in the whitelist. + True if the IP address is in the blocklist and not in the allowlist. """ - if ip_address in ip_blacklist: - if ip_whitelist is None or ip_address not in ip_whitelist: + if ip_address in blocklist: + if allowlist is None or ip_address not in allowlist: return True return False @@ -154,27 +154,27 @@ def _make_scheduler( return _scheduler -class _IPBlacklistingResolver: +class _IPBlockingResolver: """ - A proxy for reactor.nameResolver which only produces non-blacklisted IP - addresses, preventing DNS rebinding attacks on URL preview. + A proxy for reactor.nameResolver which only produces non-blocklisted IP + addresses, preventing DNS rebinding attacks. """ def __init__( self, reactor: IReactorPluggableNameResolver, - ip_whitelist: Optional[IPSet], - ip_blacklist: IPSet, + ip_allowlist: Optional[IPSet], + ip_blocklist: IPSet, ): """ Args: reactor: The twisted reactor. - ip_whitelist: IP addresses to allow. - ip_blacklist: IP addresses to disallow. + ip_allowlist: IP addresses to allow. + ip_blocklist: IP addresses to disallow. """ self._reactor = reactor - self._ip_whitelist = ip_whitelist - self._ip_blacklist = ip_blacklist + self._ip_allowlist = ip_allowlist + self._ip_blocklist = ip_blocklist def resolveHostName( self, recv: IResolutionReceiver, hostname: str, portNumber: int = 0 @@ -191,16 +191,13 @@ class _IPBlacklistingResolver: ip_address = IPAddress(address.host) - if check_against_blacklist( - ip_address, self._ip_whitelist, self._ip_blacklist - ): + if _is_ip_blocked(ip_address, self._ip_allowlist, self._ip_blocklist): logger.info( - "Dropped %s from DNS resolution to %s due to blacklist" - % (ip_address, hostname) + "Blocked %s from DNS resolution to %s" % (ip_address, hostname) ) has_bad_ip = True - # if we have a blacklisted IP, we'd like to raise an error to block the + # if we have a blocked IP, we'd like to raise an error to block the # request, but all we can really do from here is claim that there were no # valid results. if not has_bad_ip: @@ -232,24 +229,24 @@ class _IPBlacklistingResolver: # ISynapseReactor implies IReactorCore, but explicitly marking it this as an implementer # of IReactorCore seems to keep mypy-zope happier. @implementer(IReactorCore, ISynapseReactor) -class BlacklistingReactorWrapper: +class BlocklistingReactorWrapper: """ - A Reactor wrapper which will prevent DNS resolution to blacklisted IP + A Reactor wrapper which will prevent DNS resolution to blocked IP addresses, to prevent DNS rebinding. """ def __init__( self, reactor: IReactorPluggableNameResolver, - ip_whitelist: Optional[IPSet], - ip_blacklist: IPSet, + ip_allowlist: Optional[IPSet], + ip_blocklist: IPSet, ): self._reactor = reactor - # We need to use a DNS resolver which filters out blacklisted IP + # We need to use a DNS resolver which filters out blocked IP # addresses, to prevent DNS rebinding. - self._nameResolver = _IPBlacklistingResolver( - self._reactor, ip_whitelist, ip_blacklist + self._nameResolver = _IPBlockingResolver( + self._reactor, ip_allowlist, ip_blocklist ) def __getattr__(self, attr: str) -> Any: @@ -260,7 +257,7 @@ class BlacklistingReactorWrapper: return getattr(self._reactor, attr) -class BlacklistingAgentWrapper(Agent): +class BlocklistingAgentWrapper(Agent): """ An Agent wrapper which will prevent access to IP addresses being accessed directly (without an IP address lookup). @@ -269,18 +266,18 @@ class BlacklistingAgentWrapper(Agent): def __init__( self, agent: IAgent, - ip_blacklist: IPSet, - ip_whitelist: Optional[IPSet] = None, + ip_blocklist: IPSet, + ip_allowlist: Optional[IPSet] = None, ): """ Args: agent: The Agent to wrap. - ip_whitelist: IP addresses to allow. - ip_blacklist: IP addresses to disallow. + ip_allowlist: IP addresses to allow. + ip_blocklist: IP addresses to disallow. """ self._agent = agent - self._ip_whitelist = ip_whitelist - self._ip_blacklist = ip_blacklist + self._ip_allowlist = ip_allowlist + self._ip_blocklist = ip_blocklist def request( self, @@ -299,13 +296,9 @@ class BlacklistingAgentWrapper(Agent): # Not an IP pass else: - if check_against_blacklist( - ip_address, self._ip_whitelist, self._ip_blacklist - ): - logger.info("Blocking access to %s due to blacklist" % (ip_address,)) - e = SynapseError( - HTTPStatus.FORBIDDEN, "IP address blocked by IP blacklist entry" - ) + if _is_ip_blocked(ip_address, self._ip_allowlist, self._ip_blocklist): + logger.info("Blocking access to %s" % (ip_address,)) + e = SynapseError(HTTPStatus.FORBIDDEN, "IP address blocked") return defer.fail(Failure(e)) return self._agent.request( @@ -763,10 +756,9 @@ class SimpleHttpClient(BaseHttpClient): Args: hs: The HomeServer instance to pass in treq_args: Extra keyword arguments to be given to treq.request. - ip_blacklist: The IP addresses that are blacklisted that - we may not request. - ip_whitelist: The whitelisted IP addresses, that we can - request if it were otherwise caught in a blacklist. + ip_blocklist: The IP addresses that we may not request. + ip_allowlist: The allowed IP addresses, that we can + request if it were otherwise caught in a blocklist. use_proxy: Whether proxy settings should be discovered and used from conventional environment variables. """ @@ -775,19 +767,19 @@ class SimpleHttpClient(BaseHttpClient): self, hs: "HomeServer", treq_args: Optional[Dict[str, Any]] = None, - ip_whitelist: Optional[IPSet] = None, - ip_blacklist: Optional[IPSet] = None, + ip_allowlist: Optional[IPSet] = None, + ip_blocklist: Optional[IPSet] = None, use_proxy: bool = False, ): super().__init__(hs, treq_args=treq_args) - self._ip_whitelist = ip_whitelist - self._ip_blacklist = ip_blacklist - - if self._ip_blacklist: - # If we have an IP blacklist, we need to use a DNS resolver which - # filters out blacklisted IP addresses, to prevent DNS rebinding. - self.reactor: ISynapseReactor = BlacklistingReactorWrapper( - self.reactor, self._ip_whitelist, self._ip_blacklist + self._ip_allowlist = ip_allowlist + self._ip_blocklist = ip_blocklist + + if self._ip_blocklist: + # If we have an IP blocklist, we need to use a DNS resolver which + # filters out blocked IP addresses, to prevent DNS rebinding. + self.reactor: ISynapseReactor = BlocklistingReactorWrapper( + self.reactor, self._ip_allowlist, self._ip_blocklist ) # the pusher makes lots of concurrent SSL connections to Sygnal, and tends to @@ -809,14 +801,13 @@ class SimpleHttpClient(BaseHttpClient): use_proxy=use_proxy, ) - if self._ip_blacklist: - # If we have an IP blacklist, we then install the blacklisting Agent - # which prevents direct access to IP addresses, that are not caught - # by the DNS resolution. - self.agent = BlacklistingAgentWrapper( + if self._ip_blocklist: + # If we have an IP blocklist, we then install the Agent which prevents + # direct access to IP addresses, that are not caught by the DNS resolution. + self.agent = BlocklistingAgentWrapper( self.agent, - ip_blacklist=self._ip_blacklist, - ip_whitelist=self._ip_whitelist, + ip_blocklist=self._ip_blocklist, + ip_allowlist=self._ip_allowlist, ) |