mirror of
https://github.com/element-hq/synapse.git
synced 2024-11-24 02:25:45 +03:00
197 lines
7.2 KiB
Markdown
197 lines
7.2 KiB
Markdown
Support in Synapse for tracking agreement to server terms and conditions
|
|
========================================================================
|
|
|
|
Synapse 0.30 introduces support for tracking whether users have agreed to the
|
|
terms and conditions set by the administrator of a server - and blocking access
|
|
to the server until they have.
|
|
|
|
There are several parts to this functionality; each requires some specific
|
|
configuration in `homeserver.yaml` to be enabled.
|
|
|
|
Note that various parts of the configuration and this document refer to the
|
|
"privacy policy": agreement with a privacy policy is one particular use of this
|
|
feature, but of course administrators can specify other terms and conditions
|
|
unrelated to "privacy" per se.
|
|
|
|
Collecting policy agreement from a user
|
|
---------------------------------------
|
|
|
|
Synapse can be configured to serve the user a simple policy form with an
|
|
"accept" button. Clicking "Accept" records the user's acceptance in the
|
|
database and shows a success page.
|
|
|
|
To enable this, first create templates for the policy and success pages.
|
|
These should be stored on the local filesystem.
|
|
|
|
These templates use the [Jinja2](http://jinja.pocoo.org) templating language,
|
|
and [docs/privacy_policy_templates](https://github.com/element-hq/synapse/tree/develop/docs/privacy_policy_templates/)
|
|
gives examples of the sort of thing that can be done.
|
|
|
|
Note that the templates must be stored under a name giving the language of the
|
|
template - currently this must always be `en` (for "English");
|
|
internationalisation support is intended for the future.
|
|
|
|
The template for the policy itself should be versioned and named according to
|
|
the version: for example `1.0.html`. The version of the policy which the user
|
|
has agreed to is stored in the database.
|
|
|
|
Once the templates are in place, make the following changes to `homeserver.yaml`:
|
|
|
|
1. Add a `user_consent` section, which should look like:
|
|
|
|
```yaml
|
|
user_consent:
|
|
template_dir: privacy_policy_templates
|
|
version: 1.0
|
|
```
|
|
|
|
`template_dir` points to the directory containing the policy
|
|
templates. `version` defines the version of the policy which will be served
|
|
to the user. In the example above, Synapse will serve
|
|
`privacy_policy_templates/en/1.0.html`.
|
|
|
|
|
|
2. Add a `form_secret` setting at the top level:
|
|
|
|
|
|
```yaml
|
|
form_secret: "<unique secret>"
|
|
```
|
|
|
|
This should be set to an arbitrary secret string (try `pwgen -y 30` to
|
|
generate suitable secrets).
|
|
|
|
More on what this is used for below.
|
|
|
|
3. Add `consent` wherever the `client` resource is currently enabled in the
|
|
`listeners` configuration. For example:
|
|
|
|
```yaml
|
|
listeners:
|
|
- port: 8008
|
|
resources:
|
|
- names:
|
|
- client
|
|
- consent
|
|
```
|
|
|
|
|
|
Finally, ensure that `jinja2` is installed. If you are using a virtualenv, this
|
|
should be a matter of `pip install Jinja2`. On debian, try `apt-get install
|
|
python-jinja2`.
|
|
|
|
Once this is complete, and the server has been restarted, try visiting
|
|
`https://<server>/_matrix/consent`. If correctly configured, this should give
|
|
an error "Missing string query parameter 'u'". It is now possible to manually
|
|
construct URIs where users can give their consent.
|
|
|
|
### Enabling consent tracking at registration
|
|
|
|
1. Add the following to your configuration:
|
|
|
|
```yaml
|
|
user_consent:
|
|
require_at_registration: true
|
|
policy_name: "Privacy Policy" # or whatever you'd like to call the policy
|
|
```
|
|
|
|
2. In your consent templates, make use of the `public_version` variable to
|
|
see if an unauthenticated user is viewing the page. This is typically
|
|
wrapped around the form that would be used to actually agree to the document:
|
|
|
|
```html
|
|
{% if not public_version %}
|
|
<!-- The variables used here are only provided when the 'u' param is given to the homeserver -->
|
|
<form method="post" action="consent">
|
|
<input type="hidden" name="v" value="{{version}}"/>
|
|
<input type="hidden" name="u" value="{{user}}"/>
|
|
<input type="hidden" name="h" value="{{userhmac}}"/>
|
|
<input type="submit" value="Sure thing!"/>
|
|
</form>
|
|
{% endif %}
|
|
```
|
|
|
|
3. Restart Synapse to apply the changes.
|
|
|
|
Visiting `https://<server>/_matrix/consent` should now give you a view of the privacy
|
|
document. This is what users will be able to see when registering for accounts.
|
|
|
|
### Constructing the consent URI
|
|
|
|
It may be useful to manually construct the "consent URI" for a given user - for
|
|
instance, in order to send them an email asking them to consent. To do this,
|
|
take the base `https://<server>/_matrix/consent` URL and add the following
|
|
query parameters:
|
|
|
|
* `u`: the user id of the user. This can either be a full MXID
|
|
(`@user:server.com`) or just the localpart (`user`).
|
|
|
|
* `h`: hex-encoded HMAC-SHA256 of `u` using the `form_secret` as a key. It is
|
|
possible to calculate this on the commandline with something like:
|
|
|
|
```bash
|
|
echo -n '<user>' | openssl sha256 -hmac '<form_secret>'
|
|
```
|
|
|
|
This should result in a URI which looks something like:
|
|
`https://<server>/_matrix/consent?u=<user>&h=68a152465a4d...`.
|
|
|
|
|
|
Note that not providing a `u` parameter will be interpreted as wanting to view
|
|
the document from an unauthenticated perspective, such as prior to registration.
|
|
Therefore, the `h` parameter is not required in this scenario. To enable this
|
|
behaviour, set `require_at_registration` to `true` in your `user_consent` config.
|
|
|
|
|
|
Sending users a server notice asking them to agree to the policy
|
|
----------------------------------------------------------------
|
|
|
|
It is possible to configure Synapse to send a [server
|
|
notice](server_notices.md) to anybody who has not yet agreed to the current
|
|
version of the policy. To do so:
|
|
|
|
* ensure that the consent resource is configured, as in the previous section
|
|
|
|
* ensure that server notices are configured, as in [the server notice documentation](server_notices.md).
|
|
|
|
* Add `server_notice_content` under `user_consent` in `homeserver.yaml`. For
|
|
example:
|
|
|
|
```yaml
|
|
user_consent:
|
|
server_notice_content:
|
|
msgtype: m.text
|
|
body: >-
|
|
Please give your consent to the privacy policy at %(consent_uri)s.
|
|
```
|
|
|
|
Synapse automatically replaces the placeholder `%(consent_uri)s` with the
|
|
consent uri for that user.
|
|
|
|
* ensure that `public_baseurl` is set in `homeserver.yaml`, and gives the base
|
|
URI that clients use to connect to the server. (It is used to construct
|
|
`consent_uri` in the server notice.)
|
|
|
|
|
|
Blocking users from using the server until they agree to the policy
|
|
-------------------------------------------------------------------
|
|
|
|
Synapse can be configured to block any attempts to join rooms or send messages
|
|
until the user has given their agreement to the policy. (Joining the server
|
|
notices room is exempted from this).
|
|
|
|
To enable this, add `block_events_error` under `user_consent`. For example:
|
|
|
|
```yaml
|
|
user_consent:
|
|
block_events_error: >-
|
|
You can't send any messages until you consent to the privacy policy at
|
|
%(consent_uri)s.
|
|
```
|
|
|
|
Synapse automatically replaces the placeholder `%(consent_uri)s` with the
|
|
consent uri for that user.
|
|
|
|
ensure that `public_baseurl` is set in `homeserver.yaml`, and gives the base
|
|
URI that clients use to connect to the server. (It is used to construct
|
|
`consent_uri` in the error.)
|