Merge pull request #3268 from matrix-org/rav/privacy_policy_docs
Docs on consent bits
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Richard van der Hoff
GitHub
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Support in Synapse for tracking agreement to server terms and conditions
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========================================================================
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Synapse 0.30 introduces support for tracking whether users have agreed to the
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terms and conditions set by the administrator of a server - and blocking access
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to the server until they have.
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There are several parts to this functionality; each requires some specific
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configuration in `homeserver.yaml` to be enabled.
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Note that various parts of the configuation and this document refer to the
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"privacy policy": agreement with a privacy policy is one particular use of this
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feature, but of course adminstrators can specify other terms and conditions
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unrelated to "privacy" per se.
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Collecting policy agreement from a user
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---------------------------------------
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Synapse can be configured to serve the user a simple policy form with an
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"accept" button. Clicking "Accept" records the user's acceptance in the
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database and shows a success page.
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To enable this, first create templates for the policy and success pages.
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These should be stored on the local filesystem.
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These templates use the [Jinja2](http://jinja.pocoo.org) templating language,
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and [docs/privacy_policy_templates](privacy_policy_templates) gives
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examples of the sort of thing that can be done.
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Note that the templates must be stored under a name giving the language of the
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template - currently this must always be `en` (for "English");
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internationalisation support is intended for the future.
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The template for the policy itself should be versioned and named according to
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the version: for example `1.0.html`. The version of the policy which the user
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has agreed to is stored in the database.
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Once the templates are in place, make the following changes to `homeserver.yaml`:
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1. Add a `user_consent` section, which should look like:
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```yaml
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user_consent:
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template_dir: privacy_policy_templates
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version: 1.0
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```
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`template_dir` points to the directory containing the policy
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templates. `version` defines the version of the policy which will be served
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to the user. In the example above, Synapse will serve
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`privacy_policy_templates/en/1.0.html`.
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2. Add a `form_secret` setting at the top level:
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```yaml
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form_secret: "<unique secret>"
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```
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This should be set to an arbitrary secret string (try `pwgen -y 30` to
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generate suitable secrets).
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More on what this is used for below.
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3. Add `consent` wherever the `client` resource is currently enabled in the
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`listeners` configuration. For example:
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```yaml
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listeners:
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- port: 8008
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resources:
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- names:
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- client
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- consent
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```
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Finally, ensure that `jinja2` is installed. If you are using a virtualenv, this
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should be a matter of `pip install Jinja2`. On debian, try `apt-get install
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python-jinja2`.
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Once this is complete, and the server has been restarted, try visiting
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`https://<server>/_matrix/consent`. If correctly configured, this should give
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an error "Missing string query parameter 'u'". It is now possible to manually
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construct URIs where users can give their consent.
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### Constructing the consent URI
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It may be useful to manually construct the "consent URI" for a given user - for
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instance, in order to send them an email asking them to consent. To do this,
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take the base `https://<server>/_matrix/consent` URL and add the following
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query parameters:
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* `u`: the user id of the user. This can either be a full MXID
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(`@user:server.com`) or just the localpart (`user`).
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* `h`: hex-encoded HMAC-SHA256 of `u` using the `form_secret` as a key. It is
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possible to calculate this on the commandline with something like:
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```bash
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echo -n '<user>' | openssl sha256 -hmac '<form_secret>'
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```
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This should result in a URI which looks something like:
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`https://<server>/_matrix/consent?u=<user>&h=68a152465a4d...`.
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Sending users a server notice asking them to agree to the policy
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----------------------------------------------------------------
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It is possible to configure Synapse to send a [server
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notice](server_notices.md) to anybody who has not yet agreed to the current
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version of the policy. To do so:
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* ensure that the consent resource is configured, as in the previous section
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* ensure that server notices are configured, as in [server_notices.md](server_notices.md).
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* Add `server_notice_content` under `user_consent` in `homeserver.yaml`. For
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example:
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```yaml
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user_consent:
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server_notice_content:
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msgtype: m.text
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body: >-
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Please give your consent to the privacy policy at %(consent_uri)s.
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```
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Synapse automatically replaces the placeholder `%(consent_uri)s` with the
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consent uri for that user.
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* ensure that `public_baseurl` is set in `homeserver.yaml`, and gives the base
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URI that clients use to connect to the server. (It is used to construct
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`consent_uri` in the server notice.)
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Blocking users from using the server until they agree to the policy
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-------------------------------------------------------------------
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Synapse can be configured to block any attempts to join rooms or send messages
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until the user has given their agreement to the policy. (Joining the server
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notices room is exempted from this).
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To enable this, add `block_events_error` under `user_consent`. For example:
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```yaml
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user_consent:
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block_events_error: >-
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You can't send any messages until you consent to the privacy policy at
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%(consent_uri)s.
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```
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Synapse automatically replaces the placeholder `%(consent_uri)s` with the
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consent uri for that user.
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ensure that `public_baseurl` is set in `homeserver.yaml`, and gives the base
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URI that clients use to connect to the server. (It is used to construct
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`consent_uri` in the error.)
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Using the synapse manhole
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=========================
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The "manhole" allows server administrators to access a Python shell on a running
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Synapse installation. This is a very powerful mechanism for administration and
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debugging.
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To enable it, first uncomment the `manhole` listener configuration in
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`homeserver.yaml`:
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```yaml
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listeners:
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- port: 9000
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bind_addresses: ['::1', '127.0.0.1']
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type: manhole
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```
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(`bind_addresses` in the above is important: it ensures that access to the
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manhole is only possible for local users).
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Note that this will give administrative access to synapse to **all users** with
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shell access to the server. It should therefore **not** be enabled in
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environments where untrusted users have shell access.
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Then restart synapse, and point an ssh client at port 9000 on localhost, using
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the username `matrix`:
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```bash
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ssh -p9000 matrix@localhost
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```
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The password is `rabbithole`.
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This gives a Python REPL in which `hs` gives access to the
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`synapse.server.HomeServer` object - which in turn gives access to many other
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parts of the process.
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As a simple example, retrieving an event from the database:
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```
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>>> hs.get_datastore().get_event('$1416420717069yeQaw:matrix.org')
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<Deferred at 0x7ff253fc6998 current result: <FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''>>
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```
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@ -1,23 +0,0 @@
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If enabling the 'consent' resource in synapse, you will need some templates
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for the HTML to be served to the user. This directory contains very simple
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examples of the sort of thing that can be done.
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You'll need to add this sort of thing to your homeserver.yaml:
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```
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form_secret: <unique but arbitrary secret>
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user_consent:
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template_dir: docs/privacy_policy_templates
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version: 1.0
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```
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You should then be able to enable the `consent` resource under a `listener`
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entry. For example:
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```
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listeners:
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- port: 8008
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resources:
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- names: [client, consent]
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```
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Server Notices
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==============
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'Server Notices' are a new feature introduced in Synapse 0.30. They provide a
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channel whereby server administrators can send messages to users on the server.
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They are used as part of communication of the server polices(see
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[consent_tracking.md](consent_tracking.md)), however the intention is that
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they may also find a use for features such as "Message of the day".
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This is a feature specific to Synapse, but it uses standard Matrix
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communication mechanisms, so should work with any Matrix client.
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User experience
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---------------
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When the user is first sent a server notice, they will get an invitation to a
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room (typically called 'Server Notices', though this is configurable in
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`homeserver.yaml`). They will be **unable to reject** this invitation -
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attempts to do so will receive an error.
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Once they accept the invitation, they will see the notice message in the room
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history; it will appear to have come from the 'server notices user' (see
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below).
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The user is prevented from sending any messages in this room by the power
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levels. They also cannot leave it.
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Synapse configuration
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---------------------
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Server notices come from a specific user id on the server. Server
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administrators are free to choose the user id - something like `server` is
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suggested, meaning the notices will come from
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`@server:<your_server_name>`. Once the Server Notices user is configured, that
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user id becomes a special, privileged user, so administrators should ensure
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that **it is not already allocated**.
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In order to support server notices, it is necessary to add some configuration
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to the `homeserver.yaml` file. In particular, you should add a `server_notices`
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section, which should look like this:
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```yaml
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server_notices:
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system_mxid_localpart: server
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system_mxid_display_name: "Server Notices"
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room_name: "Server Notices"
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```
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The only compulsory setting is `system_mxid_localpart`, which defines the user
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id of the server notices user, as above. `system_mxid_display_name` and
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`room_name` define the displayname of the system notices user, and of
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the notices room, respectively.
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Sending notices
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---------------
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As of the current version of synapse, there is no convenient interface for
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sending notices (other than the automated ones sent as part of consent
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tracking).
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In the meantime, it is possible to test this feature using the manhole. Having
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gone into the manhole as described in [manhole.md](manhole.md), a notice can be
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sent with something like:
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```
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>>> hs.get_server_notices_manager().send_notice('@user:server.com', {'msgtype':'m.text', 'body':'foo'})
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```
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