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Docker packaging should not su-exec or chmod if already running as UID/GID #5970

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Sep 3, 2019
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Docker packaging should not su-exec or chmod if already running as UID/GID #5970

merged 6 commits into from
Sep 3, 2019

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@michaelkaye michaelkaye commented Sep 3, 2019 •
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It's possible to configure docker to set the UID/GID before a container starts.

Some docker based environments, such as openshift, force containers to run with a specific UID and GID and cannot start as 0:0 and drop to a different user to continue execution.

This PR checks whether the environment of the docker container is that of the uid/gid running start.py are the same as the UID/GID specified in the environment.

If this is true, then it does not attempt any chmod / su-exec based operations, as:

  • su-exec requires root to function
  • chmod will work only if the target uid:gid matches the existing permissions.

so these will not generally succeed if the container is not already running as root.

Existing deployments using root:root to run the container will be unaffected, as their UID/GID will not match.
Existing deployments using another UID/GID to run the container currently do not function as they're unable to use su-exec to change.

If UID != getuid but getuid != root, then running the container will fail with a chmod / su-exec error that it's unable to assume the group,

I think this could also be expressed as a check for getuid/getgid not being root:root and if that's true, set ownership = None, but that would then not attempt to perform the changes, and you would be able to supply a UID/GID but not use them. But happy to have thoughts on whether that would be better.

Pull Request Checklist

  • Pull request is based on the develop branch
  • Pull request includes a changelog file
  • Pull request includes a sign off

@michaelkaye
Adjust su-exec to only be used if needed
6ab5fe9 
If UID == getuid() and GID == getgid()
then we do not need to su-exec to these users.
@michaelkaye
Changelog.d
307fd1b
@richvdh richvdh requested a review from a team September 3, 2019 11:45
richvdh
richvdh reviewed Sep 3, 2019
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looks generally good modulo the nits below. Please can you run the script through black (or fix up the styling manually) to fix the CI?

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michaelkaye and others added 3 commits September 3, 2019 14:05
@michaelkaye @richvdh
Update changelog.d/5970.misc
47688f3 
Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
@michaelkaye
Move to ".docker" changelog
ab46203
@michaelkaye
Address formatting issues, improve log lines.
ec67b5c
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I've also updated the logging lines so it's clearer when we choose not to run chmod - hopefully this will at least make debugging why odd UID / getuid() mismatches are causing pain when running the container.

richvdh
richvdh approved these changes Sep 3, 2019
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lgtm

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@michaelkaye @richvdh
Apply suggestions from code review
94f3ed3 
Small changes to doc strings

Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
@michaelkaye michaelkaye merged commit 894c1a5 into develop Sep 3, 2019
anoadragon453 added a commit that referenced this pull request Oct 3, 2019
@anoadragon453
Merge tag 'v1.4.0'
782dd72 
Synapse 1.4.0 (2019-10-03)
==========================

Bugfixes
--------

- Redact `client_secret` in server logs. ([\#6158](#6158))

Synapse 1.4.0rc2 (2019-10-02)
=============================

Bugfixes
--------

- Fix bug in background update that adds last seen information to the `devices` table, and improve its performance on Postgres. ([\#6135](#6135))
- Fix bad performance of censoring redactions background task. ([\#6141](#6141))
- Fix fetching censored redactions from DB, which caused APIs like initial sync to fail if it tried to include the censored redaction. ([\#6145](#6145))
- Fix exceptions when storing large retry intervals for down remote servers. ([\#6146](#6146))

Internal Changes
----------------

- Fix up sample config entry for `redaction_retention_period` option. ([\#6117](#6117))

Synapse 1.4.0rc1 (2019-09-26)
=============================

Note that this release includes significant changes around 3pid
verification. Administrators are reminded to review the [upgrade notes](UPGRADE.rst#upgrading-to-v140).

Features
--------

- Changes to 3pid verification:
  - Add the ability to send registration emails from the homeserver rather than delegating to an identity server. ([\#5835](#5835), [\#5940](#5940), [\#5993](#5993), [\#5994](#5994), [\#5868](#5868))
  - Replace `trust_identity_server_for_password_resets` config option with `account_threepid_delegates`, and make the `id_server` parameteter optional on `*/requestToken` endpoints, as per [MSC2263](matrix-org/matrix-spec-proposals#2263). ([\#5876](#5876), [\#5969](#5969), [\#6028](#6028))
  - Switch to using the v2 Identity Service `/lookup` API where available, with fallback to v1. (Implements [MSC2134](matrix-org/matrix-spec-proposals#2134) plus `id_access_token authentication` for v2 Identity Service APIs from [MSC2140](matrix-org/matrix-spec-proposals#2140)). ([\#5897](#5897))
  - Remove `bind_email` and `bind_msisdn` parameters from `/register` ala [MSC2140](matrix-org/matrix-spec-proposals#2140). ([\#5964](#5964))
  - Add `m.id_access_token` to `unstable_features` in `/versions` as per [MSC2264](matrix-org/matrix-spec-proposals#2264). ([\#5974](#5974))
  - Use the v2 Identity Service API for 3PID invites. ([\#5979](#5979))
  - Add `POST /_matrix/client/unstable/account/3pid/unbind` endpoint from [MSC2140](matrix-org/matrix-spec-proposals#2140) for unbinding a 3PID from an identity server without removing it from the homeserver user account. ([\#5980](#5980), [\#6062](#6062))
  - Use `account_threepid_delegate.email` and `account_threepid_delegate.msisdn` for validating threepid sessions. ([\#6011](#6011))
  - Allow homeserver to handle or delegate email validation when adding an email to a user's account. ([\#6042](#6042))
  - Implement new Client Server API endpoints `/account/3pid/add` and `/account/3pid/bind` as per [MSC2290](matrix-org/matrix-spec-proposals#2290). ([\#6043](#6043))
  - Add an unstable feature flag for separate add/bind 3pid APIs. ([\#6044](#6044))
  - Remove `bind` parameter from Client Server POST `/account` endpoint as per [MSC2290](matrix-org/matrix-spec-proposals#2290). ([\#6067](#6067))
  - Add `POST /add_threepid/msisdn/submit_token` endpoint for proxying submitToken on an `account_threepid_handler`. ([\#6078](#6078))
  - Add `submit_url` response parameter to `*/msisdn/requestToken` endpoints. ([\#6079](#6079))
  - Add `m.require_identity_server` flag to /version's unstable_features. ([\#5972](#5972))
- Enhancements to OpenTracing support:
  - Make OpenTracing work in worker mode. ([\#5771](#5771))
  - Pass OpenTracing contexts between servers when transmitting EDUs. ([\#5852](#5852))
  - OpenTracing for device list updates. ([\#5853](#5853))
  - Add a tag recording a request's authenticated entity and corresponding servlet in OpenTracing. ([\#5856](#5856))
  - Add minimum OpenTracing for client servlets. ([\#5983](#5983))
  - Check at setup that OpenTracing is installed if it's enabled in the config. ([\#5985](#5985))
  - Trace replication send times. ([\#5986](#5986))
  - Include missing OpenTracing contexts in outbout replication requests. ([\#5982](#5982))
  - Fix sending of EDUs when OpenTracing is enabled with an empty whitelist. ([\#5984](#5984))
  - Fix invalid references to None while OpenTracing if the log context slips. ([\#5988](#5988), [\#5991](#5991))
  - OpenTracing for room and e2e keys. ([\#5855](#5855))
  - Add OpenTracing span over HTTP push processing. ([\#6003](#6003))
- Add an admin API to purge old rooms from the database. ([\#5845](#5845))
- Retry well-known lookups if we have recently seen a valid well-known record for the server. ([\#5850](#5850))
- Add support for filtered room-directory search requests over federation ([MSC2197](matrix-org/matrix-spec-proposals#2197), in order to allow upcoming room directory query performance improvements. ([\#5859](#5859))
- Correctly retry all hosts returned from SRV when we fail to connect. ([\#5864](#5864))
- Add admin API endpoint for setting whether or not a user is a server administrator. ([\#5878](#5878))
- Enable cleaning up extremities with dummy events by default to prevent undue build up of forward extremities. ([\#5884](#5884))
- Add config option to sign remote key query responses with a separate key. ([\#5895](#5895))
- Add support for config templating. ([\#5900](#5900))
- Users with the type of "support" or "bot" are no longer required to consent. ([\#5902](#5902))
- Let synctl accept a directory of config files. ([\#5904](#5904))
- Increase max display name size to 256. ([\#5906](#5906))
- Add admin API endpoint for getting whether or not a user is a server administrator. ([\#5914](#5914))
- Redact events in the database that have been redacted for a week. ([\#5934](#5934))
- New prometheus metrics:
  - `synapse_federation_known_servers`: represents the total number of servers your server knows about (i.e. is in rooms with), including itself. Enable by setting `metrics_flags.known_servers` to True in the configuration.([\#5981](#5981))
  - `synapse_build_info`: exposes the Python version, OS version, and Synapse version of the running server. ([\#6005](#6005))
- Give appropriate exit codes when synctl fails. ([\#5992](#5992))
- Apply the federation blacklist to requests to identity servers. ([\#6000](#6000))
- Add `report_stats_endpoint` option to configure where stats are reported to, if enabled. Contributed by @Sorunome. ([\#6012](#6012))
- Add config option to increase ratelimits for room admins redacting messages. ([\#6015](#6015))
- Stop sending federation transactions to servers which have been down for a long time. ([\#6026](#6026))
- Make the process for mapping SAML2 users to matrix IDs more flexible. ([\#6037](#6037))
- Return a clearer error message when a timeout occurs when attempting to contact an identity server. ([\#6073](#6073))
- Prevent password reset's submit_token endpoint from accepting trailing slashes. ([\#6074](#6074))
- Return 403 on `/register/available` if registration has been disabled. ([\#6082](#6082))
- Explicitly log when a homeserver does not have the `trusted_key_servers` config field configured. ([\#6090](#6090))
- Add support for pruning old rows in `user_ips` table. ([\#6098](#6098))

Bugfixes
--------

- Don't create broken room when `power_level_content_override.users` does not contain `creator_id`. ([\#5633](#5633))
- Fix database index so that different backup versions can have the same sessions. ([\#5857](#5857))
- Fix Synapse looking for config options `password_reset_failure_template` and `password_reset_success_template`, when they are actually `password_reset_template_failure_html`, `password_reset_template_success_html`. ([\#5863](#5863))
- Fix stack overflow when recovering an appservice which had an outage. ([\#5885](#5885))
- Fix error message which referred to `public_base_url` instead of `public_baseurl`. Thanks to @aaronraimist for the fix! ([\#5909](#5909))
- Fix 404 for thumbnail download when `dynamic_thumbnails` is `false` and the thumbnail was dynamically generated. Fix reported by rkfg. ([\#5915](#5915))
- Fix a cache-invalidation bug for worker-based deployments. ([\#5920](#5920))
- Fix admin API for listing media in a room not being available with an external media repo. ([\#5966](#5966))
- Fix list media admin API always returning an error. ([\#5967](#5967))
- Fix room and user stats tracking. ([\#5971](#5971), [\#5998](#5998), [\#6029](#6029))
- Return a `M_MISSING_PARAM` if `sid` is not provided to `/account/3pid`. ([\#5995](#5995))
- `federation_certificate_verification_whitelist` now will not cause `TypeErrors` to be raised (a regression in 1.3). Additionally, it now supports internationalised domain names in their non-canonical representation. ([\#5996](#5996))
- Only count real users when checking for auto-creation of auto-join room. ([\#6004](#6004))
- Ensure support users can be registered even if MAU limit is reached. ([\#6020](#6020))
- Fix bug where login error was shown incorrectly on SSO fallback login. ([\#6024](#6024))
- Fix bug in calculating the federation retry backoff period. ([\#6025](#6025))
- Prevent exceptions being logged when extremity-cleanup events fail due to lack of user consent to the terms of service. ([\#6053](#6053))
- Remove POST method from password-reset `submit_token` endpoint until we implement `submit_url` functionality. ([\#6056](#6056))
- Fix logcontext spam on non-Linux platforms. ([\#6059](#6059))
- Ensure query parameters in email validation links are URL-encoded. ([\#6063](#6063))
- Fix a bug which caused SAML attribute maps to be overridden by defaults. ([\#6069](#6069))
- Fix the logged number of updated items for the `users_set_deactivated_flag` background update. ([\#6092](#6092))
- Add `sid` to `next_link` for email validation. ([\#6097](#6097))
- Threepid validity checks on msisdns should not be dependent on `threepid_behaviour_email`. ([\#6104](#6104))
- Ensure that servers which are not configured to support email address verification do not offer it in the registration flows. ([\#6107](#6107))

Updates to the Docker image
---------------------------

- Avoid changing `UID/GID` if they are already correct. ([\#5970](#5970))
- Provide `SYNAPSE_WORKER` envvar to specify python module. ([\#6058](#6058))

Improved Documentation
----------------------

- Convert documentation to markdown (from rst) ([\#5849](#5849))
- Update `INSTALL.md` to say that Python 2 is no longer supported. ([\#5953](#5953))
- Add developer documentation for using SAML2. ([\#6032](#6032))
- Add some notes on rolling back to v1.3.1. ([\#6049](#6049))
- Update the upgrade notes. ([\#6050](#6050))

Deprecations and Removals
-------------------------

- Remove shared-secret registration from `/_matrix/client/r0/register` endpoint. Contributed by Awesome Technologies Innovationslabor GmbH. ([\#5877](#5877))
- Deprecate the `trusted_third_party_id_servers` option. ([\#5875](#5875))

Internal Changes
----------------

- Lay the groundwork for structured logging output. ([\#5680](#5680))
- Retry well-known lookup before the cache expires, giving a grace period where the remote well-known can be down but we still use the old result. ([\#5844](#5844))
- Remove log line for debugging issue #5407. ([\#5860](#5860))
- Refactor the Appservice scheduler code. ([\#5886](#5886))
- Compatibility with v2 Identity Service APIs other than /lookup. ([\#5892](#5892), [\#6013](#6013))
- Stop populating some unused tables. ([\#5893](#5893), [\#6047](#6047))
- Add missing index on `users_in_public_rooms` to improve the performance of directory queries. ([\#5894](#5894))
- Improve the logging when we have an error when fetching signing keys. ([\#5896](#5896))
- Add support for database engine-specific schema deltas, based on file extension. ([\#5911](#5911))
- Update Buildkite pipeline to use plugins instead of buildkite-agent commands. ([\#5922](#5922))
- Add link in sample config to the logging config schema. ([\#5926](#5926))
- Remove unnecessary parentheses in return statements. ([\#5931](#5931))
- Remove unused `jenkins/prepare_sytest.sh` file. ([\#5938](#5938))
- Move Buildkite pipeline config to the pipelines repo. ([\#5943](#5943))
- Remove unnecessary return statements in the codebase which were the result of a regex run. ([\#5962](#5962))
- Remove left-over methods from v1 registration API. ([\#5963](#5963))
- Cleanup event auth type initialisation. ([\#5975](#5975))
- Clean up dependency checking at setup. ([\#5989](#5989))
- Update OpenTracing docs to use the unified `trace` method. ([\#5776](#5776))
- Small refactor of function arguments and docstrings in` RoomMemberHandler`. ([\#6009](#6009))
- Remove unused `origin` argument on `FederationHandler.add_display_name_to_third_party_invite`. ([\#6010](#6010))
- Add a `failure_ts` column to the `destinations` database table. ([\#6016](#6016), [\#6072](#6072))
- Clean up some code in the retry logic. ([\#6017](#6017))
- Fix the structured logging tests stomping on the global log configuration for subsequent tests. ([\#6023](#6023))
- Clean up the sample config for SAML authentication. ([\#6064](#6064))
- Change mailer logging to reflect Synapse doesn't just do chat notifications by email now. ([\#6075](#6075))
- Move last-seen info into devices table. ([\#6089](#6089))
- Remove unused parameter to `get_user_id_by_threepid`. ([\#6099](#6099))
- Refactor the user-interactive auth handling. ([\#6105](#6105))
- Refactor code for calculating registration flows. ([\#6106](#6106))
@richvdh richvdh mentioned this pull request Nov 18, 2019
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babolivier pushed a commit that referenced this pull request Sep 1, 2021
@anoadragon453
Docker packaging should not su-exec or chmod if already running as UI…
e400097 
…D/GID (#5970)
@richvdh richvdh mentioned this pull request Oct 29, 2021
Merged
richvdh added a commit that referenced this pull request Oct 29, 2021
@richvdh
Docker image: avoid changing user during generate
d9c6f17 
The intention was always that the config files get written as the initial user
(normally root) - only the data directory needs to be writable by Synapse. This
got changed in #5970, but that seems
to have been a mistake.
richvdh added a commit that referenced this pull request Nov 1, 2021
@richvdh
Docker: avoid changing userid unnecessarily (#11209)
0b99d4c 
* Docker image: avoid changing user during `generate`

The intention was always that the config files get written as the initial user
(normally root) - only the data directory needs to be writable by Synapse. This
got changed in #5970, but that seems
to have been a mistake.

* Avoid changing user if no explicit UID is given

* changelog
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@michaelkaye @richvdh