Add admin API for logging in as a user #8617

erikjohnston · 2020-10-21T16:28:41Z

~~Based on #8616, #8614~~. Fixes #6054.

I think reviewing this commit by commit makes the most sense. The PR is a bit large, I'm hesitant to split it up but can do if people struggle.

Fixes #6054.

synapse/rest/admin/users.py

clokep · 2020-10-30T16:32:24Z

synapse/rest/admin/users.py

+        if valid_until_ms and not isinstance(valid_until_ms, int):
+            raise SynapseError(400, "'valid_until_ms' parameter must be an int")
+
+        if auth_user.to_string() == user_id:


Is there any case-sensitivity concerns with this comparison?

User IDs are case sensitive, we fudge it a bit at log in but that's about it. Plus I don't think its the end of the world to puppet it yourself, its just a weird thing to try and do.

Well the case sensitivity is only there for backwards compatibility, I think? But yeah I get your point of it not really being an error, just weird.

synapse/rest/admin/users.py

synapse/handlers/message.py

synapse/api/auth_blocking.py

clokep · 2020-10-30T17:10:10Z

synapse/handlers/profile.py

        if by_admin:
-            requester = create_requester(target_user)
+            requester = create_requester(
+                target_user, authenticated_entity=requester.authenticated_entity,
+            )


Should the caller be updated to pass in a different requester instead of having the by_admin flag?

It's a bit of an edge case tbh. The original request has kinda the "right" requester, we could fudge it but then it is a bit less clear whether the admin user is using a puppeted token vs authenticating as themselves 🤷

synapse/handlers/register.py

clokep · 2020-10-30T17:14:19Z

synapse/module_api/__init__.py

+        requester = create_requester(
+            event_dict["sender"], authenticated_entity=self._server_name
+        )


I think this gives callers (which might be 3rd party code) significantly increased powers? Maybe in reality that doesn't matter, but thought it was worth calling out.

Yes 👍, in the sense that they aren't subject to rate limits or MAU limits, which I think is what you'd expect.

tests/rest/admin/test_user.py

clokep · 2020-10-30T17:17:27Z

tests/rest/admin/test_user.py

+        # Logging in as the other user and joining a room should work, even
+        # though they should be denied.


Meaning that the admin can allow this even though it normally wouldn't be allowed? Does this bump the mau to 2?

I've rejigged the wording. The MAU limit would stop the real user from joining (or doing other actions) as the server has reached the MAU limit, but the admin user is still allowed to puppet them. The MAU isn't bumped to 2 as we base those off the authenticated entity, which is always the admin user in this case.

clokep · 2020-10-30T17:18:06Z

Seems pretty reasonable overall! I think this actually fixes some other oddities now that we can say "the server is doing this"?

Co-authored-by: Patrick Cloke <[email protected]>

Twi1ightSparkle · 2020-11-02T13:11:10Z

Will this also allow logging in as @server:homeserver.tld? I understand that this is a bit of a special user?

anoadragon453 · 2020-11-02T13:18:34Z

Will this also allow logging in as @server:homeserver.tld? I understand that this is a bit of a special user?

I believe this is the auto_join_mxid_localpart user (docs) that you're referring to. Yes, this should allow retrieving an access token for this user if I understand things correctly.

clokep

I think this looks fine. One thought though -- is there a way to get a list of your access tokens that refer to other accounts? This seems like it would be a useful thing to look up after the fact? (E.g. if you wanted to have an admin API to logout of other access tokens easily.)

clokep · 2020-11-16T16:28:57Z

synapse/rest/admin/users.py

+        if valid_until_ms and not isinstance(valid_until_ms, int):
+            raise SynapseError(400, "'valid_until_ms' parameter must be an int")
+
+        if auth_user.to_string() == user_id:


Well the case sensitivity is only there for backwards compatibility, I think? But yeah I get your point of it not really being an error, just weird.

clokep · 2020-11-16T16:30:55Z

This will need develop merged as we discussed! 😄

erikjohnston · 2020-11-17T10:16:49Z

I think this looks fine. One thought though -- is there a way to get a list of your access tokens that refer to other accounts? This seems like it would be a useful thing to look up after the fact? (E.g. if you wanted to have an admin API to logout of other access tokens easily.)

Yeah, probably, though I'm inclined to leave that for now.

This was broken due to #8617 and #8761.

@angdraug

Synapse 1.24.0 (2020-12-09) =========================== Due to the two security issues highlighted below, server administrators are encouraged to update Synapse. We are not aware of these vulnerabilities being exploited in the wild. Security advisory ----------------- The following issues are fixed in v1.23.1 and v1.24.0. - There is a denial of service attack ([CVE-2020-26257](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26257)) against the federation APIs in which future events will not be correctly sent to other servers over federation. This affects all servers that participate in open federation. (Fixed in [#8776](matrix-org/synapse#8776)). - Synapse may be affected by OpenSSL [CVE-2020-1971](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971). Synapse administrators should ensure that they have the latest versions of the cryptography Python package installed. To upgrade Synapse along with the cryptography package: * Administrators using the [`matrix.org` Docker image](https://hub.docker.com/r/matrixdotorg/synapse/) or the [Debian/Ubuntu packages from `matrix.org`](https://github.com/matrix-org/synapse/blob/master/INSTALL.md#matrixorg-packages) should ensure that they have version 1.24.0 or 1.23.1 installed: these images include the updated packages. * Administrators who have [installed Synapse from source](https://github.com/matrix-org/synapse/blob/master/INSTALL.md#installing-from-source) should upgrade the cryptography package within their virtualenv by running: ```sh <path_to_virtualenv>/bin/pip install 'cryptography>=3.3' ``` * Administrators who have installed Synapse from distribution packages should consult the information from their distributions. Internal Changes ---------------- - Add a maximum version for pysaml2 on Python 3.5. ([\#8898](matrix-org/synapse#8898)) Synapse 1.24.0rc2 (2020-12-04) ============================== Bugfixes -------- - Fix a regression in v1.24.0rc1 which failed to allow SAML mapping providers which were unable to redirect users to an additional page. ([\#8878](matrix-org/synapse#8878)) Internal Changes ---------------- - Add support for the `prometheus_client` newer than 0.9.0. Contributed by Jordan Bancino. ([\#8875](matrix-org/synapse#8875)) Synapse 1.24.0rc1 (2020-12-02) ============================== Features -------- - Add admin API for logging in as a user. ([\#8617](matrix-org/synapse#8617)) - Allow specification of the SAML IdP if the metadata returns multiple IdPs. ([\#8630](matrix-org/synapse#8630)) - Add support for re-trying generation of a localpart for OpenID Connect mapping providers. ([\#8801](matrix-org/synapse#8801), [\#8855](matrix-org/synapse#8855)) - Allow the `Date` header through CORS. Contributed by Nicolas Chamo. ([\#8804](matrix-org/synapse#8804)) - Add a config option, `push.group_by_unread_count`, which controls whether unread message counts in push notifications are defined as "the number of rooms with unread messages" or "total unread messages". ([\#8820](matrix-org/synapse#8820)) - Add `force_purge` option to delete-room admin api. ([\#8843](matrix-org/synapse#8843)) Bugfixes -------- - Fix a bug where appservices may be sent an excessive amount of read receipts and presence. Broke in v1.22.0. ([\#8744](matrix-org/synapse#8744)) - Fix a bug in some federation APIs which could lead to unexpected behaviour if different parameters were set in the URI and the request body. ([\#8776](matrix-org/synapse#8776)) - Fix a bug where synctl could spawn duplicate copies of a worker. Contributed by Waylon Cude. ([\#8798](matrix-org/synapse#8798)) - Allow per-room profiles to be used for the server notice user. ([\#8799](matrix-org/synapse#8799)) - Fix a bug where logging could break after a call to SIGHUP. ([\#8817](matrix-org/synapse#8817)) - Fix `register_new_matrix_user` failing with "Bad Request" when trailing slash is included in server URL. Contributed by @angdraug. ([\#8823](matrix-org/synapse#8823)) - Fix a minor long-standing bug in login, where we would offer the `password` login type if a custom auth provider supported it, even if password login was disabled. ([\#8835](matrix-org/synapse#8835)) - Fix a long-standing bug which caused Synapse to require unspecified parameters during user-interactive authentication. ([\#8848](matrix-org/synapse#8848)) - Fix a bug introduced in v1.20.0 where the user-agent and IP address reported during user registration for CAS, OpenID Connect, and SAML were of the wrong form. ([\#8784](matrix-org/synapse#8784)) Improved Documentation ---------------------- - Clarify the usecase for a msisdn delegate. Contributed by Adrian Wannenmacher. ([\#8734](matrix-org/synapse#8734)) - Remove extraneous comma from JSON example in User Admin API docs. ([\#8771](matrix-org/synapse#8771)) - Update `turn-howto.md` with troubleshooting notes. ([\#8779](matrix-org/synapse#8779)) - Fix the example on how to set the `Content-Type` header in nginx for the Client Well-Known URI. ([\#8793](matrix-org/synapse#8793)) - Improve the documentation for the admin API to list all media in a room with respect to encrypted events. ([\#8795](matrix-org/synapse#8795)) - Update the formatting of the `push` section of the homeserver config file to better align with the [code style guidelines](https://github.com/matrix-org/synapse/blob/develop/docs/code_style.md#configuration-file-format). ([\#8818](matrix-org/synapse#8818)) - Improve documentation how to configure prometheus for workers. ([\#8822](matrix-org/synapse#8822)) - Update example prometheus console. ([\#8824](matrix-org/synapse#8824)) Deprecations and Removals ------------------------- - Remove old `/_matrix/client/*/admin` endpoints which were deprecated since Synapse 1.20.0. ([\#8785](matrix-org/synapse#8785)) - Disable pretty printing JSON responses for curl. Users who want pretty-printed output should use [jq](https://stedolan.github.io/jq/) in combination with curl. Contributed by @tulir. ([\#8833](matrix-org/synapse#8833)) Internal Changes ---------------- - Simplify the way the `HomeServer` object caches its internal attributes. ([\#8565](matrix-org/synapse#8565), [\#8851](matrix-org/synapse#8851)) - Add an example and documentation for clock skew to the SAML2 sample configuration to allow for clock/time difference between the homserver and IdP. Contributed by @localguru. ([\#8731](matrix-org/synapse#8731)) - Generalise `RoomMemberHandler._locally_reject_invite` to apply to more flows than just invite. ([\#8751](matrix-org/synapse#8751)) - Generalise `RoomStore.maybe_store_room_on_invite` to handle other, non-invite membership events. ([\#8754](matrix-org/synapse#8754)) - Refactor test utilities for injecting HTTP requests. ([\#8757](matrix-org/synapse#8757), [\#8758](matrix-org/synapse#8758), [\#8759](matrix-org/synapse#8759), [\#8760](matrix-org/synapse#8760), [\#8761](matrix-org/synapse#8761), [\#8777](matrix-org/synapse#8777)) - Consolidate logic between the OpenID Connect and SAML code. ([\#8765](matrix-org/synapse#8765)) - Use `TYPE_CHECKING` instead of magic `MYPY` variable. ([\#8770](matrix-org/synapse#8770)) - Add a commandline script to sign arbitrary json objects. ([\#8772](matrix-org/synapse#8772)) - Minor log line improvements for the SSO mapping code used to generate Matrix IDs from SSO IDs. ([\#8773](matrix-org/synapse#8773)) - Add additional error checking for OpenID Connect and SAML mapping providers. ([\#8774](matrix-org/synapse#8774), [\#8800](matrix-org/synapse#8800)) - Add type hints to HTTP abstractions. ([\#8806](matrix-org/synapse#8806), [\#8812](matrix-org/synapse#8812)) - Remove unnecessary function arguments and add typing to several membership replication classes. ([\#8809](matrix-org/synapse#8809)) - Optimise the lookup for an invite from another homeserver when trying to reject it. ([\#8815](matrix-org/synapse#8815)) - Add tests for `password_auth_provider`s. ([\#8819](matrix-org/synapse#8819)) - Drop redundant database index on `event_json`. ([\#8845](matrix-org/synapse#8845)) - Simplify `uk.half-shot.msc2778.login.application_service` login handler. ([\#8847](matrix-org/synapse#8847)) - Refactor `password_auth_provider` support code. ([\#8849](matrix-org/synapse#8849)) - Add missing `ordering` to background database updates. ([\#8850](matrix-org/synapse#8850)) - Allow for specifying a room version when creating a room in unit tests via `RestHelper.create_room_as`. ([\#8854](matrix-org/synapse#8854))

This makes use of matrix-org/synapse#8617 so it requires Synapse >= 1.24.

erikjohnston force-pushed the erikj/puppet_api branch from 098bf3b to 167d38a Compare October 21, 2020 16:32

erikjohnston force-pushed the erikj/puppet_api branch 2 times, most recently from 7461e43 to 986d03b Compare October 29, 2020 17:52

erikjohnston added 5 commits October 29, 2020 18:22

Add admin API for logging in as a user

1c1772f

Fixes #6054.

Privacy policy applies to authenticated entity

715a169

MAU limits are based off of the *authenticated* user

e67476e

Correctly set authenticated_entity when creating ad hoc requesters

6e338c4

Newsfile

1c8f9a7

erikjohnston force-pushed the erikj/puppet_api branch from 986d03b to 1c8f9a7 Compare October 29, 2020 18:22

erikjohnston added 2 commits October 30, 2020 10:25

Sending dummy events is no longer subject to consent

7f13aa7

Fix mocked functions assert_called_with

9b9a7bd

erikjohnston force-pushed the erikj/puppet_api branch from ec40caa to 9b9a7bd Compare October 30, 2020 10:29

erikjohnston requested a review from a team October 30, 2020 11:07

clokep suggested changes Oct 30, 2020

View reviewed changes

erikjohnston and others added 4 commits November 2, 2020 10:04

Update tests/rest/admin/test_user.py

ae0fef3

Co-authored-by: Patrick Cloke <[email protected]>

Review

9e89ef6

Use POST

3b400ec

Remove duplicated error handling

49c1eb9

erikjohnston requested a review from clokep November 2, 2020 10:41

erikjohnston requested a review from a team November 2, 2020 13:58

clokep approved these changes Nov 16, 2020

View reviewed changes

Merge remote-tracking branch 'origin/develop' into erikj/puppet_api

310e9d1

erikjohnston merged commit f737368 into develop Nov 17, 2020

erikjohnston deleted the erikj/puppet_api branch November 17, 2020 10:51

erikjohnston added a commit that referenced this pull request Nov 18, 2020

Fix tests on develop

23f5106

This was broken due to #8617 and #8761.

erikjohnston mentioned this pull request Nov 18, 2020

Fix tests on develop #8777

Merged

erikjohnston added a commit that referenced this pull request Nov 18, 2020

Fix tests on develop (#8777)

03e392f

This was broken due to #8617 and #8761.

spantaleev mentioned this pull request Dec 4, 2020

Pre-generate E2EE recovery keys / populate 3PIDs devture/matrix-corporal#17

Open

spantaleev added a commit to devture/matrix-corporal that referenced this pull request Jan 16, 2021

Impersonate users using /_synapse/admin/v1/users/<user_id>/login

b1e8e38

This makes use of matrix-org/synapse#8617 so it requires Synapse >= 1.24.

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Add admin API for logging in as a user #8617

Add admin API for logging in as a user #8617

erikjohnston commented Oct 21, 2020 •

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clokep commented Nov 16, 2020

erikjohnston commented Nov 17, 2020

		# Logging in as the other user and joining a room should work, even
		# though they should be denied.

Add admin API for logging in as a user #8617

Add admin API for logging in as a user #8617

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