Follows: #18212

---------

Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>

Signed-off-by: Olivier 'reivilibre <oliverw@matrix.org>

The context for this is that the Matrix spec allows basically anything
in the device ID. With MSC3861, we're restricting this to strings that
can be represented as scopes.
Whilst this works well for next-gen auth sessions, compatibility/legacy
sessions still can have characters that can't be encoded (mainly spaces)
in them.

To work around that, we added in MAS a behaviour where the device_id is
given as an explicit property of the token introspection response, and
remove it from the scope.
Because we don't expect users to rollout new Synapse and MAS versions in
sync, we needed a way to 'advertise' support for this behaviour: the
easiest way to do that was through an extra header in the introspection
response.

On the longer term, I expect MAS and Synapse to move away from the
introspection endpoint, and instead define a specific API for Synapse ->
MAS communication.

PR on the MAS side:
https://github.com/element-hq/matrix-authentication-service/pull/4067

Allows overriding the `redirect_uri` parameter sent to both the
authorization and token endpoints of the IdP. Typically this parameter
is hardcoded to `<public_baseurl>/_synapse/client/oidc/callback`.

Yet it can be useful in certain contexts to allow a different callback
URL. For instance, if you would like to intercept the authorization code
returned from the IdP and do something with it, before eventually
calling Synapse's OIDC callback URL yourself.

This change enables enterprise use cases but does not change the default
behaviour.

---

Best reviewed commit-by-commit.

---------

Co-authored-by: Eric Eastwood <erice@element.io>

Workers now get their secrets from files, too! There are not many config
options left to pathify :) Includes documentation and unit tests.

### Pull Request Checklist

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---------

Co-authored-by: Devon Hudson <devon.dmytro@gmail.com>

I [was
told](https://github.com/element-hq/synapse/pull/17983#issuecomment-2593370897)
about another config option with a secret, so I got `form_secret` a
companion: `form_secret_path`

This PR makes NixOS and Kubernetes users a little bit happy. Includes
docs and tests.

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Bumps [pyo3-log](https://github.com/vorner/pyo3-log) from 0.12.0 to
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Bumps [serde](https://github.com/serde-rs/serde) from 1.0.217 to
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Apply ratelimiting on delayed event management separately from messages.

### Pull Request Checklist

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---------

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

Previously it was in the middle of the parameter definitions.

Bumps [anyhow](https://github.com/dtolnay/anyhow) from 1.0.95 to 1.0.96.
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Convert html links to intra-doc links</li>
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Bumps [click](https://github.com/pallets/click) from 8.1.7 to 8.1.8.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
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<blockquote>
<h2>8.1.8</h2>
<p>This is the Click 8.1.8 fix release, which fixes bugs but does not
otherwise change behavior and should not result in breaking changes
compared to the latest feature release.</p>
<p>PyPI: <a
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Milestone <a
href="https://github.com/pallets/click/milestones/23?closed=1">https://github.com/pallets/click/milestones/23?closed=1</a></p>
<ul>
<li>Fix an issue with type hints for <code>click.open_file()</code>. <a
href="https://redirect.github.com/pallets/click/issues/2717">#2717</a></li>
<li>Fix issue where error message for invalid <code>click.Path</code>
displays on
multiple lines. <a
href="https://redirect.github.com/pallets/click/issues/2697">#2697</a></li>
<li>Fixed issue that prevented a default value of
<code>&quot;&quot;</code> from being displayed in
the help for an option. <a
href="https://redirect.github.com/pallets/click/issues/2500">#2500</a></li>
<li>The test runner handles stripping color consistently on Windows. <a
href="https://redirect.github.com/pallets/click/issues/2705">#2705</a></li>
<li>Show correct value for flag default when using
<code>default_map</code>. <a
href="https://redirect.github.com/pallets/click/issues/2632">#2632</a></li>
<li>Fix <code>click.echo(color=...)</code> passing <code>color</code> to
coloroma so it can be
forced on Windows. <a
href="https://redirect.github.com/pallets/click/issues/2606">#2606</a>.</li>
<li>More robust bash version check, fixing problem on Windows with
git-bash. <a
href="https://redirect.github.com/pallets/click/issues/2638">#2638</a></li>
<li>Cache the help option generated by the
<code>help_option_names</code> setting to
respect its eagerness. <a
href="https://redirect.github.com/pallets/click/issues/2811">#2811</a></li>
<li>Replace uses of <code>os.system</code> with
<code>subprocess.Popen</code>. <a
href="https://redirect.github.com/pallets/click/issues/1476">#1476</a></li>
<li>Exceptions generated during a command will use the context's
<code>color</code>
setting when being displayed. <a
href="https://redirect.github.com/pallets/click/issues/2193">#2193</a></li>
<li>Error message when defining option with invalid name is more
descriptive. <a
href="https://redirect.github.com/pallets/click/issues/2452">#2452</a></li>
<li>Refactor code generating default <code>--help</code> option to
deduplicate code. <a
href="https://redirect.github.com/pallets/click/issues/2563">#2563</a></li>
<li>Test <code>CLIRunner</code> resets patched
<code>_compat.should_strip_ansi</code>. <a
href="https://redirect.github.com/pallets/click/issues/2732">#2732</a></li>
</ul>
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<blockquote>
<h2>Version 8.1.8</h2>
<p>Unreleased</p>
<ul>
<li>Fix an issue with type hints for <code>click.open_file()</code>.
:issue:<code>2717</code></li>
<li>Fix issue where error message for invalid <code>click.Path</code>
displays on
multiple lines. :issue:<code>2697</code></li>
<li>Fixed issue that prevented a default value of
<code>&quot;&quot;</code> from being displayed in
the help for an option. :issue:<code>2500</code></li>
<li>The test runner handles stripping color consistently on Windows.
:issue:<code>2705</code></li>
<li>Show correct value for flag default when using
<code>default_map</code>.
:issue:<code>2632</code></li>
<li>Fix <code>click.echo(color=...)</code> passing <code>color</code> to
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</ul>
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<ul>
<li><a
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release version 8.1.8</li>
<li><a
href="https://github.com/pallets/click/commit/c23223b13c847ae472faa258907ffb5c27b504fa"><code>c23223b</code></a>
Add links to third-party projects enhancing Click (<a
href="https://redirect.github.com/pallets/click/issues/2815">#2815</a>)</li>
<li><a
href="https://github.com/pallets/click/commit/822d4fd0bcfcd0ab22c9eec550ee2dae2a3d260c"><code>822d4fd</code></a>
Add links to third-party projects</li>
<li><a
href="https://github.com/pallets/click/commit/8e7bed0466fd49acf8bcf1399f54d7dc783fd6a1"><code>8e7bed0</code></a>
Break up arguments section (<a
href="https://redirect.github.com/pallets/click/issues/2586">#2586</a>)</li>
<li><a
href="https://github.com/pallets/click/commit/3241541fc89fe9c79908a6099fa2235dd20016e8"><code>3241541</code></a>
Remove some typing hints.</li>
<li><a
href="https://github.com/pallets/click/commit/bed037717d5f39cf875d83df4025e62beebc77f4"><code>bed0377</code></a>
remove test pypi</li>
<li><a
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update dev dependencies</li>
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fix typos</li>
<li><a
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Fix missing reset in isolation function (<a
href="https://redirect.github.com/pallets/click/issues/2733">#2733</a>)</li>
<li><a
href="https://github.com/pallets/click/commit/ffd43e9dc3b90bd698088fc7ebac9dbc6a4444b2"><code>ffd43e9</code></a>
Fixed missing reset on _compat.should_strip_ansi.</li>
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Bumps [authlib](https://github.com/lepture/authlib) from 1.4.0 to 1.4.1.
<details>
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<p><strong>Released on Jan 28, 2025</strong></p>
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fix(client): improve garbage collection for oauth clients</li>
<li><a
href="https://github.com/lepture/authlib/commit/9188e21283e52f42b0e495d978d255715d6fae7b"><code>9188e21</code></a>
fix(httpx): remove compact code for httpx</li>
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fix(httpx): update test cases for httpx</li>
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fix: update httpx client kwargs <a
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chore: update readme</li>
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Bumps [log](https://github.com/rust-lang/log) from 0.4.25 to 0.4.26.
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Merge pull request <a
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from rust-lang/cargo/0.4.26</li>
<li><a
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prepare for 0.4.26 release</li>
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Merge pull request <a
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from SpriteOvO/crate-doc-update</li>
<li><a
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Merge pull request <a
href="https://redirect.github.com/rust-lang/log/issues/668">#668</a>
from SpriteOvO/value-clone</li>
<li><a
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Add <code>spdlog-rs</code> link to crate doc</li>
<li><a
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Derive <code>Clone</code> for <code>kv::Value</code></li>
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Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.138 to
1.0.139.
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Release 1.0.139</li>
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Merge pull request <a
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from dtolnay/writefloat</li>
<li><a
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Document behavior of write_f32/f64 on non-finite floats</li>
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Merge pull request <a
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from dtolnay/doclink</li>
<li><a
href="https://github.com/serde-rs/json/commit/13591f1dd4baf2d510e56138599906815e9d798a"><code>13591f1</code></a>
Convert html links to intra-doc links</li>
<li><a
href="https://github.com/serde-rs/json/commit/1d7378e8ee87e9225da28094329e06345b76cd99"><code>1d7378e</code></a>
Unset doc-scrape-examples for lib target</li>
<li><a
href="https://github.com/serde-rs/json/commit/1174c5f57db44c26460951b525c6ede50984b655"><code>1174c5f</code></a>
Resolve unnecessary_semicolon pedantic clippy lint</li>
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Adds the `--no-secrets-in-config` command line option that makes Synapse
reject all configurations containing keys with in-line secret values.
Currently this rejects

- `turn_shared_secret`
- `registration_shared_secret`
- `macaroon_secret_key`
- `recaptcha_private_key`
- `recaptcha_public_key`
- `experimental_features.msc3861.client_secret`
- `experimental_features.msc3861.jwk`
- `experimental_features.msc3861.admin_token`
- `form_secret`
- `redis.password`
- `worker_replication_secret`

> [!TIP]
> Hey, you! Yes, you!  If you think this list is missing an item,
please leave a comment below. Thanks :)

This PR complements my other PRs[^1] that add the corresponding `_path`
variants for this class of config options. It enables admins to enforce
a policy of no secrets in configuration files and guards against
accident and malice.

Because I consider the flag `--no-secrets-in-config` to be
security-relevant, I did not add a corresponding `--secrets-in-config`
flag; this way, if Synapse command line options are appended at various
places, there is no way to weaken the once-set setting with a succeeding
flag.

[^1]: [#17690](https://github.com/element-hq/synapse/pull/17690),
[#17717](https://github.com/element-hq/synapse/pull/17717),
[#17983](https://github.com/element-hq/synapse/pull/17983),
[#17984](https://github.com/element-hq/synapse/pull/17984),
[#18004](https://github.com/element-hq/synapse/pull/18004),
[#18090](https://github.com/element-hq/synapse/pull/18090)


### Pull Request Checklist

<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->

* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
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The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
  - Use markdown where necessary, mostly for `code blocks`.
  - End with either a period (.) or an exclamation mark (!).
  - Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [x] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))

Fixes #18150 

### Pull Request Checklist

<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->

* [X] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
  - Use markdown where necessary, mostly for `code blocks`.
  - End with either a period (.) or an exclamation mark (!).
  - Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [X] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters)

)

---------

Co-authored-by: Erik Johnston <erikj@element.io>

MSC4108 relies on ETag to determine if something has changed on the
rendez-vous channel.
Strong and correct ETag comparison works if the response body is
bit-for-bit identical, which isn't the case if a proxy in the middle
compresses the response on the fly.

This adds a `no-transform` directive to the `Cache-Control` header,
which tells proxies not to transform the response body.

Additionally, some proxies (nginx) will switch to `Transfer-Encoding:
chunked` if it doesn't know the Content-Length of the response, and
'weakening' the ETag if that's the case. I've added `Content-Length`
headers to all responses, to hopefully solve that.

This basically fixes QR-code login when nginx or cloudflare is involved,
with gzip/zstd/deflate compression enabled.

Bumps [types-psycopg2](https://github.com/python/typeshed) from
2.9.21.20241019 to 2.9.21.20250121.
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Bumps
[sigstore/cosign-installer](https://github.com/sigstore/cosign-installer)
from 3.8.0 to 3.8.1.
<details>
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<p><em>Sourced from <a
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<blockquote>
<h2>v3.8.1</h2>
<h2>What's Changed</h2>
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<li>use cosign 2.4.3 and other updates by <a
href="https://github.com/cpanato"><code>@​cpanato</code></a> in <a
href="https://redirect.github.com/sigstore/cosign-installer/pull/182">sigstore/cosign-installer#182</a></li>
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<p><strong>Full Changelog</strong>: <a
href="https://github.com/sigstore/cosign-installer/compare/v3...v3.8.1">https://github.com/sigstore/cosign-installer/compare/v3...v3.8.1</a></p>
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This is in line with our general policy of ensuring that the default
config is reasonably locked down.

SyTest PR to fix tests: https://github.com/matrix-org/sytest/pull/1396

Missed in the first round.

Add support for overriding `id_token_signing_alg_values_supported` for an OpenID identity provider (#18177)

Normally, when `discovery` is enabled,
`id_token_signing_alg_values_supported` comes from the OpenID Discovery
Document (`/.well-known/openid-configuration`). If nothing was
specified, we default to supporting `RS256` in the downstream usage.

This PR just adds support for adding a default/overriding the the
discovered value [just like we do for other things like the
`token_endpoint`](https://github.com/element-hq/synapse/blob/1525a3b4d48a0f5657d61423e1f205bff9a77948/docs/usage/configuration/config_documentation.md#oidc_providers),
etc.

Missed in the transition from experimental to stable. 

Fixes #18160

This is a split off #18033 

This uses a few tricks to speed up the building of docker images:

- This switches to use `uv pip install` instead of `pip install`. This
saves a bunch of time, especially when cross-compiling
- I then looked at what packages were not using binary wheels: I
upgraded MarkupSafe to have binaries for py3.12, and got back to Python
3.12 because hiredis didn't have builds for py3.13 with the version we
were using
- The generation of the requirements.txt is arch-agnostic, so I've
switched this one to run on the build architecture, so that both arch
can share it
- The download of runtime depdendencies can be done on the build
architecture through manual `apt-get download` plus `dpkg --extract`
- We were using -slim images, but still installed a bunch of -dev
dependencies. Turns out, all the dev dependencies were already installed
in the non-slim image, which saves a bunch of time as well

This has been a problem with Element Web, as it will proble /register
with an empty body, which gave this error:

```
curl -d '{}' -HContent-Type:application/json /_matrix/client/v3/register

{"errcode": "M_UNKNOWN",
 "error": "Invalid username"}
```

And Element Web would choke on it. This changes that so we reply
instead:

```
{"errcode": "M_FORBIDDEN",
 "error": "Registration has been disabled. Only m.login.application_service registrations are allowed."}
```

Also adds a test for this.

See https://github.com/element-hq/element-web/issues/27993



---------

Co-authored-by: Andrew Morgan <andrew@amorgan.xyz>

### Pull Request Checklist

<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->

* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
  - Use markdown where necessary, mostly for `code blocks`.
  - End with either a period (.) or an exclamation mark (!).
  - Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [x] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))

- Add `get_current_time_msec()` method to the [module
API](https://matrix-org.github.io/synapse/latest/modules/writing_a_module.html

)
for sound time comparisons with Synapse.
- Fixes #18104 

Signed-off-by: Ahmed Qashlan <ahmedelqashlan@gmail.com>
Co-authored-by: Eric Eastwood <madlittlemods@gmail.com>
Co-authored-by: Erik Johnston <erikj@jki.re>

Adds new environment variables that can be used with the Docker image
(`SYNAPSE_HTTP_PROXY`/`SYNAPSE_HTTPS_PROXY`/`SYNAPSE_NO_PROXY`)

Useful for things like the [Secure Border
Gateway](https://element.io/server-suite/secure-border-gateways)


### Why is this necessary?

You can already configure the `HTTP_PROXY`/`HTTPS_PROXY` environment
variables to proxy outbound requests but setting this globally in the
Docker image affects all processes which isn't always desirable or
workable in the case where the proxy is running in the Docker image
itself (because the Debian packages will fail to download because the
proxy isn't up and running yet) . Adding Synapse specific environment
variables
(`SYNAPSE_HTTP_PROXY`/`SYNAPSE_HTTPS_PROXY`/`SYNAPSE_NO_PROXY`) makes
things much more targetable.

If a user search has many words we can end up creating really large
queries that take a long time for the database to process. Generally,
such searches don't return any results anyway (due to limits on user ID
and display name length).

We "fix" this by cheating and only searching for the first ten words.

Document consequences of replacing secrets. The covered config options
are `registration_shared_secret`, `macaroon_secret_key`, `form_secret`
and `worker_replication_secret`.

Even though I looked at the source code to check the added documentation
is right, I would appreciate additional verification of the statements
made.

In an hand-wavy attempt at classifying how bad the consequences of
secret replacement are, I added some explanations as warnings and others
as regular paragraphs.

Closes #17971 

### Pull Request Checklist

<!-- Please read
https://element-hq.github.io/synapse/latest/development/contributing_guide.html
before submitting your pull request -->

* [x] Pull request is based on the develop branch
* [x] Pull request includes a [changelog
file](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#changelog).
The entry should:
- Be a short description of your change which makes sense to users.
"Fixed a bug that prevented receiving messages from other servers."
instead of "Moved X method from `EventStore` to `EventWorkerStore`.".
  - Use markdown where necessary, mostly for `code blocks`.
  - End with either a period (.) or an exclamation mark (!).
  - Start with a capital letter.
- Feel free to credit yourself, by adding a sentence "Contributed by
@github_username." or "Contributed by [Your Name]." to the end of the
entry.
* [x] [Code
style](https://element-hq.github.io/synapse/latest/code_style.html) is
correct
(run the
[linters](https://element-hq.github.io/synapse/latest/development/contributing_guide.html#run-the-linters))