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authoranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
committeranoadragon453 <anoadragon453@users.noreply.github.com>2021-06-03 16:21:02 +0000
commit5b98526363a34c5c94d4ede0e8c44d262c085b78 (patch)
treec8e846299a0c82d24bd920a27fdfd147fa8a3a6c /develop/dev
parentSet up gh-pages branch (diff)
downloadsynapse-5b98526363a34c5c94d4ede0e8c44d262c085b78.tar.xz
deploy: fd9856e4a98fb3fa9c139317b0a3b79f22aff1c7
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diff --git a/develop/dev/cas.html b/develop/dev/cas.html
new file mode 100644
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--- /dev/null
+++ b/develop/dev/cas.html
@@ -0,0 +1,317 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js light">
+    <head>
+        <!-- Book generated using mdBook -->
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+        <title>CAS - Synapse</title>
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+
+        <nav id="sidebar" class="sidebar" aria-label="Table of contents">
+            <div class="sidebar-scrollbox">
+                <ol class="chapter"><li class="chapter-item expanded affix "><li class="part-title">Introduction</li><li class="chapter-item expanded "><a href="../welcome_and_overview.html">Welcome and Overview</a></li><li class="chapter-item expanded affix "><li class="part-title">Setup</li><li class="chapter-item expanded "><a href="../setup/installation.html">Installation</a></li><li class="chapter-item expanded "><a href="../postgres.html">Using Postgres</a></li><li class="chapter-item expanded "><a href="../reverse_proxy.html">Configuring a Reverse Proxy</a></li><li class="chapter-item expanded "><a href="../turn-howto.html">Configuring a Turn Server</a></li><li class="chapter-item expanded "><a href="../delegate.html">Delegation</a></li><li class="chapter-item expanded affix "><li class="part-title">Upgrading</li><li class="chapter-item expanded "><a href="../upgrading/index.html">Upgrading between Synapse Versions</a></li><li class="chapter-item expanded "><a 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"><a href="../openid.html">OpenID Connect</a></li><li class="chapter-item expanded "><div>SAML</div></li><li class="chapter-item expanded "><div>CAS</div></li><li class="chapter-item expanded "><a href="../sso_mapping_providers.html">SSO Mapping Providers</a></li></ol></li><li class="chapter-item expanded "><a href="../password_auth_providers.html">Password Auth Providers</a></li><li class="chapter-item expanded "><a href="../jwt.html">JSON Web Tokens</a></li></ol></li><li class="chapter-item expanded "><a href="../CAPTCHA_SETUP.html">Registration Captcha</a></li><li class="chapter-item expanded "><a href="../application_services.html">Application Services</a></li><li class="chapter-item expanded "><a href="../server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../consent_tracking.html">Consent Tracking</a></li><li class="chapter-item expanded "><a href="../url_previews.html">URL Previews</a></li><li class="chapter-item expanded "><a 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href="../usage/administration/index.html">Administration</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../usage/administration/admin_api/index.html">Admin API</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../admin_api/account_validity.html">Account Validity</a></li><li class="chapter-item expanded "><a href="../admin_api/delete_group.html">Delete Group</a></li><li class="chapter-item expanded "><a href="../admin_api/event_reports.html">Event Reports</a></li><li class="chapter-item expanded "><a href="../admin_api/media_admin_api.html">Media</a></li><li class="chapter-item expanded "><a href="../admin_api/purge_history_api.html">Purge History</a></li><li class="chapter-item expanded "><a href="../admin_api/purge_room.html">Purge Rooms</a></li><li class="chapter-item expanded "><a href="../admin_api/register_api.html">Register Users</a></li><li class="chapter-item expanded "><a href="../admin_api/room_membership.html">Manipulate Room Membership</a></li><li class="chapter-item expanded "><a href="../admin_api/rooms.html">Rooms</a></li><li class="chapter-item expanded "><a href="../admin_api/server_notices.html">Server Notices</a></li><li class="chapter-item expanded "><a href="../admin_api/shutdown_room.html">Shutdown Room</a></li><li class="chapter-item expanded "><a href="../admin_api/statistics.html">Statistics</a></li><li class="chapter-item expanded "><a href="../admin_api/user_admin_api.html">Users</a></li><li class="chapter-item expanded "><a href="../admin_api/version_api.html">Server Version</a></li></ol></li><li class="chapter-item expanded "><a href="../manhole.html">Manhole</a></li><li class="chapter-item expanded "><a href="../metrics-howto.html">Monitoring</a></li><li class="chapter-item expanded "><div>Scripts</div></li></ol></li><li class="chapter-item expanded "><li class="part-title">Development</li><li class="chapter-item expanded "><a href="../development/contributing_guide.html">Contributing Guide</a></li><li class="chapter-item expanded "><a href="../code_style.html">Code Style</a></li><li class="chapter-item expanded "><a href="../dev/git.html">Git Usage</a></li><li class="chapter-item expanded "><div>Testing</div></li><li class="chapter-item expanded "><a href="../opentracing.html">OpenTracing</a></li><li class="chapter-item expanded "><div>Synapse Architecture</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../log_contexts.html">Log Contexts</a></li><li class="chapter-item expanded "><a href="../replication.html">Replication</a></li><li class="chapter-item expanded "><a href="../tcp_replication.html">TCP Replication</a></li></ol></li><li class="chapter-item expanded "><a href="../development/internal_documentation/index.html">Internal Documentation</a></li><li><ol class="section"><li class="chapter-item expanded "><div>Single Sign-On</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../dev/saml.html">SAML</a></li><li class="chapter-item expanded "><a href="../dev/cas.html" class="active">CAS</a></li></ol></li><li class="chapter-item expanded "><div>State Resolution</div></li><li><ol class="section"><li class="chapter-item expanded "><a href="../auth_chain_difference_algorithm.html">The Auth Chain Difference Algorithm</a></li></ol></li><li class="chapter-item expanded "><a href="../media_repository.html">Media Repository</a></li><li class="chapter-item expanded "><a href="../room_and_user_statistics.html">Room and User Statistics</a></li></ol></li><li class="chapter-item expanded "><div>Scripts</div></li><li class="chapter-item expanded affix "><li class="part-title">Other</li><li class="chapter-item expanded "><a href="../deprecation_policy.html">Dependency Deprecation Policy</a></li></ol>
+            </div>
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+                        <!-- Page table of contents -->
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+
+                        <h1 id="how-to-test-cas-as-a-developer-without-a-server"><a class="header" href="#how-to-test-cas-as-a-developer-without-a-server">How to test CAS as a developer without a server</a></h1>
+<p>The <a href="https://github.com/jbittel/django-mama-cas">django-mama-cas</a> project is an
+easy to run CAS implementation built on top of Django.</p>
+<h2 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h2>
+<ol>
+<li>Create a new virtualenv: <code>python3 -m venv &lt;your virtualenv&gt;</code></li>
+<li>Activate your virtualenv: <code>source /path/to/your/virtualenv/bin/activate</code></li>
+<li>Install Django and django-mama-cas:
+<pre><code>python -m pip install &quot;django&lt;3&quot; &quot;django-mama-cas==2.4.0&quot;
+</code></pre>
+</li>
+<li>Create a Django project in the current directory:
+<pre><code>django-admin startproject cas_test .
+</code></pre>
+</li>
+<li>Follow the <a href="https://django-mama-cas.readthedocs.io/en/latest/installation.html#configuring">install directions</a> for django-mama-cas</li>
+<li>Setup the SQLite database: <code>python manage.py migrate</code></li>
+<li>Create a user:
+<pre><code>python manage.py createsuperuser
+</code></pre>
+<ol>
+<li>Use whatever you want as the username and password.</li>
+<li>Leave the other fields blank.</li>
+</ol>
+</li>
+<li>Use the built-in Django test server to serve the CAS endpoints on port 8000:
+<pre><code>python manage.py runserver
+</code></pre>
+</li>
+</ol>
+<p>You should now have a Django project configured to serve CAS authentication with
+a single user created.</p>
+<h2 id="configure-synapse-and-element-to-use-cas"><a class="header" href="#configure-synapse-and-element-to-use-cas">Configure Synapse (and Element) to use CAS</a></h2>
+<ol>
+<li>Modify your <code>homeserver.yaml</code> to enable CAS and point it to your locally
+running Django test server:
+<pre><code class="language-yaml">cas_config:
+  enabled: true
+  server_url: &quot;http://localhost:8000&quot;
+  service_url: &quot;http://localhost:8081&quot;
+  #displayname_attribute: name
+  #required_attributes:
+  #    name: value
+</code></pre>
+</li>
+<li>Restart Synapse.</li>
+</ol>
+<p>Note that the above configuration assumes the homeserver is running on port 8081
+and that the CAS server is on port 8000, both on localhost.</p>
+<h2 id="testing-the-configuration"><a class="header" href="#testing-the-configuration">Testing the configuration</a></h2>
+<p>Then in Element:</p>
+<ol>
+<li>Visit the login page with a Element pointing at your homeserver.</li>
+<li>Click the Single Sign-On button.</li>
+<li>Login using the credentials created with <code>createsuperuser</code>.</li>
+<li>You should be logged in.</li>
+</ol>
+<p>If you want to repeat this process you'll need to manually logout first:</p>
+<ol>
+<li>http://localhost:8000/admin/</li>
+<li>Click &quot;logout&quot; in the top right.</li>
+</ol>
+
+                    </main>
+
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diff --git a/develop/dev/git.html b/develop/dev/git.html
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+++ b/develop/dev/git.html
@@ -0,0 +1,376 @@
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+    <head>
+        <!-- Book generated using mdBook -->
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+
+                        <h1 id="some-notes-on-how-we-use-git"><a class="header" href="#some-notes-on-how-we-use-git">Some notes on how we use git</a></h1>
+<h2 id="on-keeping-the-commit-history-clean"><a class="header" href="#on-keeping-the-commit-history-clean">On keeping the commit history clean</a></h2>
+<p>In an ideal world, our git commit history would be a linear progression of
+commits each of which contains a single change building on what came
+before. Here, by way of an arbitrary example, is the top of <code>git log --graph b2dba0607</code>:</p>
+<img src="git/clean.png" alt="clean git graph" width="500px">
+<p>Note how the commit comment explains clearly what is changing and why. Also
+note the <em>absence</em> of merge commits, as well as the absence of commits called
+things like (to pick a few culprits):
+<a href="https://github.com/matrix-org/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/matrix-org/synapse/commit/474810d9d">“fix broken
+test”</a>,
+<a href="https://github.com/matrix-org/synapse/commit/c9d72e457">“oops”</a>,
+<a href="https://github.com/matrix-org/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/matrix-org/synapse/commit/707374d5d">“Who's
+the president?”</a>.</p>
+<p>There are a number of reasons why keeping a clean commit history is a good
+thing:</p>
+<ul>
+<li>
+<p>From time to time, after a change lands, it turns out to be necessary to
+revert it, or to backport it to a release branch. Those operations are
+<em>much</em> easier when the change is contained in a single commit.</p>
+</li>
+<li>
+<p>Similarly, it's much easier to answer questions like “is the fix for
+<code>/publicRooms</code> on the release branch?” if that change consists of a single
+commit.</p>
+</li>
+<li>
+<p>Likewise: “what has changed on this branch in the last week?” is much
+clearer without merges and “pep8” commits everywhere.</p>
+</li>
+<li>
+<p>Sometimes we need to figure out where a bug got introduced, or some
+behaviour changed. One way of doing that is with <code>git bisect</code>: pick an
+arbitrary commit between the known good point and the known bad point, and
+see how the code behaves. However, that strategy fails if the commit you
+chose is the middle of someone's epic branch in which they broke the world
+before putting it back together again.</p>
+</li>
+</ul>
+<p>One counterargument is that it is sometimes useful to see how a PR evolved as
+it went through review cycles. This is true, but that information is always
+available via the GitHub UI (or via the little-known <a href="https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/checking-out-pull-requests-locally">refs/pull
+namespace</a>).</p>
+<p>Of course, in reality, things are more complicated than that. We have release
+branches as well as <code>develop</code> and <code>master</code>, and we deliberately merge changes
+between them. Bugs often slip through and have to be fixed later. That's all
+fine: this not a cast-iron rule which must be obeyed, but an ideal to aim
+towards.</p>
+<h2 id="merges-squashes-rebases-wtf"><a class="header" href="#merges-squashes-rebases-wtf">Merges, squashes, rebases: wtf?</a></h2>
+<p>Ok, so that's what we'd like to achieve. How do we achieve it?</p>
+<p>The TL;DR is: when you come to merge a pull request, you <em>probably</em> want to
+“squash and merge”:</p>
+<p><img src="git/squash.png" alt="squash and merge" />.</p>
+<p>(This applies whether you are merging your own PR, or that of another
+contributor.)</p>
+<p>“Squash and merge”<sup id="a1"><a href="#f1">1</a></sup> takes all of the changes in the
+PR, and bundles them into a single commit. GitHub gives you the opportunity to
+edit the commit message before you confirm, and normally you should do so,
+because the default will be useless (again: <code>* woops typo</code> is not a useful
+thing to keep in the historical record).</p>
+<p>The main problem with this approach comes when you have a series of pull
+requests which build on top of one another: as soon as you squash-merge the
+first PR, you'll end up with a stack of conflicts to resolve in all of the
+others. In general, it's best to avoid this situation in the first place by
+trying not to have multiple related PRs in flight at the same time. Still,
+sometimes that's not possible and doing a regular merge is the lesser evil.</p>
+<p>Another occasion in which a regular merge makes more sense is a PR where you've
+deliberately created a series of commits each of which makes sense in its own
+right. For example: <a href="https://github.com/matrix-org/synapse/pull/6837">a PR which gradually propagates a refactoring operation
+through the codebase</a>, or <a href="https://github.com/matrix-org/synapse/pull/5987">a
+PR which is the culmination of several other
+PRs</a>. In this case the ability
+to figure out when a particular change/bug was introduced could be very useful.</p>
+<p>Ultimately: <strong>this is not a hard-and-fast-rule</strong>. If in doubt, ask yourself “do
+each of the commits I am about to merge make sense in their own right”, but
+remember that we're just doing our best to balance “keeping the commit history
+clean” with other factors.</p>
+<h2 id="git-branching-model"><a class="header" href="#git-branching-model">Git branching model</a></h2>
+<p>A <a href="https://nvie.com/posts/a-successful-git-branching-model/">lot</a>
+<a href="http://scottchacon.com/2011/08/31/github-flow.html">of</a>
+<a href="https://www.endoflineblog.com/gitflow-considered-harmful">words</a> have been
+written in the past about git branching models (no really, <a href="https://martinfowler.com/articles/branching-patterns.html">a
+lot</a>). I tend to
+think the whole thing is overblown. Fundamentally, it's not that
+complicated. Here's how we do it.</p>
+<p>Let's start with a picture:</p>
+<p><img src="git/branches.jpg" alt="branching model" /></p>
+<p>It looks complicated, but it's really not. There's one basic rule: <em>anyone</em> is
+free to merge from <em>any</em> more-stable branch to <em>any</em> less-stable branch at
+<em>any</em> time<sup id="a2"><a href="#f2">2</a></sup>. (The principle behind this is that if a
+change is good enough for the more-stable branch, then it's also good enough go
+put in a less-stable branch.)</p>
+<p>Meanwhile, merging (or squashing, as per the above) from a less-stable to a
+more-stable branch is a deliberate action in which you want to publish a change
+or a set of changes to (some subset of) the world: for example, this happens
+when a PR is landed, or as part of our release process.</p>
+<p>So, what counts as a more- or less-stable branch? A little reflection will show
+that our active branches are ordered thus, from more-stable to less-stable:</p>
+<ul>
+<li><code>master</code> (tracks our last release).</li>
+<li><code>release-vX.Y.Z</code> (the branch where we prepare the next release)<sup
+   id="a3"><a href="#f3">3</a></sup>.</li>
+<li>PR branches which are targeting the release.</li>
+<li><code>develop</code> (our &quot;mainline&quot; branch containing our bleeding-edge).</li>
+<li>regular PR branches.</li>
+</ul>
+<p>The corollary is: if you have a bugfix that needs to land in both
+<code>release-vX.Y.Z</code> <em>and</em> <code>develop</code>, then you should base your PR on
+<code>release-vX.Y.Z</code>, get it merged there, and then merge from <code>release-vX.Y.Z</code> to
+<code>develop</code>. (If a fix lands in <code>develop</code> and we later need it in a
+release-branch, we can of course cherry-pick it, but landing it in the release
+branch first helps reduce the chance of annoying conflicts.)</p>
+<hr />
+<p><b id="f1">[1]</b>: “Squash and merge” is GitHub's term for this
+operation. Given that there is no merge involved, I'm not convinced it's the
+most intuitive name. <a href="#a1">^</a></p>
+<p><b id="f2">[2]</b>: Well, anyone with commit access.<a href="#a2">^</a></p>
+<p><b id="f3">[3]</b>: Very, very occasionally (I think this has happened once in
+the history of Synapse), we've had two releases in flight at once. Obviously,
+<code>release-v1.2.3</code> is more-stable than <code>release-v1.3.0</code>. <a href="#a3">^</a></p>
+
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+                        <h1 id="how-to-test-saml-as-a-developer-without-a-server"><a class="header" href="#how-to-test-saml-as-a-developer-without-a-server">How to test SAML as a developer without a server</a></h1>
+<p>https://capriza.github.io/samling/samling.html (https://github.com/capriza/samling) is a great
+resource for being able to tinker with the SAML options within Synapse without needing to
+deploy and configure a complicated software stack.</p>
+<p>To make Synapse (and therefore Riot) use it:</p>
+<ol>
+<li>Use the samling.html URL above or deploy your own and visit the IdP Metadata tab.</li>
+<li>Copy the XML to your clipboard.</li>
+<li>On your Synapse server, create a new file <code>samling.xml</code> next to your <code>homeserver.yaml</code> with
+the XML from step 2 as the contents.</li>
+<li>Edit your <code>homeserver.yaml</code> to include:
+<pre><code class="language-yaml">saml2_config:
+  sp_config:
+    allow_unknown_attributes: true  # Works around a bug with AVA Hashes: https://github.com/IdentityPython/pysaml2/issues/388
+    metadata:
+      local: [&quot;samling.xml&quot;]   
+</code></pre>
+</li>
+<li>Ensure that your <code>homeserver.yaml</code> has a setting for <code>public_baseurl</code>:
+<pre><code class="language-yaml">public_baseurl: http://localhost:8080/
+</code></pre>
+</li>
+<li>Run <code>apt-get install xmlsec1</code> and <code>pip install --upgrade --force 'pysaml2&gt;=4.5.0'</code> to ensure
+the dependencies are installed and ready to go.</li>
+<li>Restart Synapse.</li>
+</ol>
+<p>Then in Riot:</p>
+<ol>
+<li>Visit the login page with a Riot pointing at your homeserver.</li>
+<li>Click the Single Sign-On button.</li>
+<li>On the samling page, enter a Name Identifier and add a SAML Attribute for <code>uid=your_localpart</code>.
+The response must also be signed.</li>
+<li>Click &quot;Next&quot;.</li>
+<li>Click &quot;Post Response&quot; (change nothing).</li>
+<li>You should be logged in.</li>
+</ol>
+<p>If you try and repeat this process, you may be automatically logged in using the information you
+gave previously. To fix this, open your developer console (<code>F12</code> or <code>Ctrl+Shift+I</code>) while on the
+samling page and clear the site data. In Chrome, this will be a button on the Application tab.</p>
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