Fix IP URL previews on Python 3 #4215
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Initial fix for #4208 . Needs more tests, mostly around the moved code regarding IP blacklisting. |
Codecov Report
@@ Coverage Diff @@
## develop #4215 +/- ##
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+ Coverage 73.54% 73.59% +0.04%
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Files 302 302
Lines 29894 29924 +30
Branches 4891 4898 +7
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+ Hits 21987 22023 +36
+ Misses 6470 6463 -7
- Partials 1437 1438 +1
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It is not a given that getaddrinfo's results are cached - in general each separate call can result in a separate request to the DNS server. I'm pretty sure that with a short TTL and by rapidly switching an A record between internal and external addresses, you could get access to a blacklisted IP address in not-very-many attempts, so I'm really quite keen that we find a solution here that doesn't involve two separate DNS lookups.
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Further looks at the IP blacklist to be done in #4242 -- reducing the scope of this PR to just the listed bug. |
synapse/config/repository.py
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| @@ -151,6 +155,12 @@ def read_config(self, config): | |||
| except ImportError: | |||
| raise ConfigError(MISSING_LXML) | |||
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|||
| try: | |||
| import hyperlink | |||
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we'll need to document this in the README (grep for lxml - there's more than one place) as well as the upgrade notes, and put something in the changelog about it, to stop people getting surprised by it suddenly not working.
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This should only affect people on Twisteds older than 17.5, which hard depends on hyperlink. (I guess this affects xenial and so?) Maybe I should add it to our pip dependencies?
| ) | ||
| request_deferred = timeout_deferred( | ||
| request_deferred, 60, self.hs.get_reactor(), |
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all these unrelated formatting changes make this a much bigger diff, so make it much harder to review. pleeeease can we keep formatting and functional changes separate in future?
| def __init__(self, agent, reactor, whitelist=None, blacklist=None): | ||
| """ | ||
| An Agent wrapper which will prevent access to IP addresses being accessed | ||
| directly (without an IP address lookup). |
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I'm not really clear what you mean by "an IP address lookup" here.
Is this just an optimisation? I'm not sure the extra complexity it introduces makes it worthwhile if so.
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Accessing an IP address directly means that it doesn't do a DNS lookup for said IP address.
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right, so it never hits the IPBlacklistingResolver? Is this not a problem if we get a 302 redirect to an IP address?
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The 302 should reenter through request ()? Let me check. Maybe it doesn't
work how I think.
…On Sat., 22 Dec. 2018, 02:55 Richard van der Hoff ***@***.*** wrote:
***@***.**** commented on this pull request.
------------------------------
In synapse/http/client.py
<#4215 (comment)>:
> @@ -111,20 +128,32 @@ def _callback(addrs):
class BlacklistingAgentWrapper(Agent):
- def __init__(self, agent, reactor, whitelist=None, blacklist=None):
+ """
+ An Agent wrapper which will prevent access to IP addresses being accessed
+ directly (without an IP address lookup).
right, so it never hits the IPBlacklistingResolver? Is this not a problem
if we get a 302 redirect to an IP address?
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<#4215 (comment)>,
or mute the thread
<https://github.com/notifications/unsubscribe-auth/ADJ2XHkb3pgiShRqtBj3OkDJBf3Tv1P9ks5u7QRygaJpZM4YsOzv>
.
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Okay, yes, that's how it works. When it gets a redirect, it recalls
request, which then has the filter.
I can add another test if it would make you feel better :)
…On Sat., 22 Dec. 2018, 02:57 Amber Brown ***@***.*** wrote:
The 302 should reenter through request ()? Let me check. Maybe it doesn't
work how I think.
On Sat., 22 Dec. 2018, 02:55 Richard van der Hoff <
***@***.*** wrote:
> ***@***.**** commented on this pull request.
> ------------------------------
>
> In synapse/http/client.py
> <#4215 (comment)>:
>
> > @@ -111,20 +128,32 @@ def _callback(addrs):
>
>
> class BlacklistingAgentWrapper(Agent):
> - def __init__(self, agent, reactor, whitelist=None, blacklist=None):
> + """
> + An Agent wrapper which will prevent access to IP addresses being accessed
> + directly (without an IP address lookup).
>
> right, so it never hits the IPBlacklistingResolver? Is this not a problem
> if we get a 302 redirect to an IP address?
>
> —
> You are receiving this because you modified the open/close state.
> Reply to this email directly, view it on GitHub
> <#4215 (comment)>,
> or mute the thread
> <https://github.com/notifications/unsubscribe-auth/ADJ2XHkb3pgiShRqtBj3OkDJBf3Tv1P9ks5u7QRygaJpZM4YsOzv>
> .
>
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It would make me feel better, but if you're confident it works right, I don't mind too much :) |
Synapse 0.34.1rc1 (2019-01-08) ============================== Features -------- - Special-case a support user for use in verifying behaviour of a given server. The support user does not appear in user directory or monthly active user counts. ([\#4141](#4141), [\#4344](#4344)) - Support for serving .well-known files ([\#4262](#4262)) - Rework SAML2 authentication ([\#4265](#4265), [\#4267](#4267)) - SAML2 authentication: Initialise user display name from SAML2 data ([\#4272](#4272)) - Synapse can now have its conditional/extra dependencies installed by pip. This functionality can be used by using `pip install matrix-synapse[feature]`, where feature is a comma separated list with the possible values `email.enable_notifs`, `matrix-synapse-ldap3`, `postgres`, `resources.consent`, `saml2`, `url_preview`, and `test`. If you want to install all optional dependencies, you can use "all" instead. ([\#4298](#4298), [\#4325](#4325), [\#4327](#4327)) - Add routes for reading account data. ([\#4303](#4303)) - Add opt-in support for v2 rooms ([\#4307](#4307)) - Add a script to generate a clean config file ([\#4315](#4315)) - Return server data in /login response ([\#4319](#4319)) Bugfixes -------- - Fix contains_url check to be consistent with other instances in code-base and check that value is an instance of string. ([\#3405](#3405)) - Fix CAS login when username is not valid in an MXID ([\#4264](#4264)) - Send CORS headers for /media/config ([\#4279](#4279)) - Add 'sandbox' to CSP for media reprository ([\#4284](#4284)) - Make the new landing page prettier. ([\#4294](#4294)) - Fix deleting E2E room keys when using old SQLite versions. ([\#4295](#4295)) - The metric synapse_admin_mau:current previously did not update when config.mau_stats_only was set to True ([\#4305](#4305)) - Fixed per-room account data filters ([\#4309](#4309)) - Fix indentation in default config ([\#4313](#4313)) - Fix synapse:latest docker upload ([\#4316](#4316)) - Fix test_metric.py compatibility with prometheus_client 0.5. Contributed by Maarten de Vries <maarten@de-vri.es>. ([\#4317](#4317)) - Avoid packaging _trial_temp directory in -py3 debian packages ([\#4326](#4326)) - Check jinja version for consent resource ([\#4327](#4327)) - fix NPE in /messages by checking if all events were filtered out ([\#4330](#4330)) - Fix `python -m synapse.config` on Python 3. ([\#4356](#4356)) Deprecations and Removals ------------------------- - Remove the deprecated v1/register API on Python 2. It was never ported to Python 3. ([\#4334](#4334)) Internal Changes ---------------- - Getting URL previews of IP addresses no longer fails on Python 3. ([\#4215](#4215)) - drop undocumented dependency on dateutil ([\#4266](#4266)) - Update the example systemd config to use a virtualenv ([\#4273](#4273)) - Update link to kernel DCO guide ([\#4274](#4274)) - Make isort tox check print diff when it fails ([\#4283](#4283)) - Log room_id in Unknown room errors ([\#4297](#4297)) - Documentation improvements for coturn setup. Contributed by Krithin Sitaram. ([\#4333](#4333)) - Update pull request template to use absolute links ([\#4341](#4341)) - Update README to not lie about required restart when updating TLS certificates ([\#4343](#4343)) - Update debian packaging for compatibility with transitional package ([\#4349](#4349)) - Fix command hint to generate a config file when trying to start without a config file ([\#4353](#4353)) - Add better logging for unexpected errors while sending transactions ([\#4358](#4358))
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