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Using the synapse manhole
=========================
The "manhole" allows server administrators to access a Python shell on a running
Synapse installation. This is a very powerful mechanism for administration and
debugging.
**_Security Warning_**
Note that this will give administrative access to synapse to **all users** with
shell access to the server. It should therefore **not** be enabled in
environments where untrusted users have shell access.
## Configuring the manhole
To enable it, first add the `manhole` listener configuration in your
`homeserver.yaml`. You can find information on how to do that
in the [configuration manual](usage/configuration/config_documentation.md#manhole_settings).
The configuration is slightly different if you're using docker.
#### Docker config
If you are using Docker, set `bind_addresses` to `['0.0.0.0']` as shown:
```yaml
listeners:
- port: 9000
bind_addresses: ['0.0.0.0']
type: manhole
```
When using `docker run` to start the server, you will then need to change the command to the following to include the
`manhole` port forwarding. The `-p 127.0.0.1:9000:9000` below is important: it
ensures that access to the `manhole` is only possible for local users.
```bash
docker run -d --name synapse \
--mount type=volume,src=synapse-data,dst=/data \
-p 8008:8008 \
-p 127.0.0.1:9000:9000 \
vectorim/synapse:latest
```
#### Native config
If you are not using docker, set `bind_addresses` to `['::1', '127.0.0.1']` as shown.
The `bind_addresses` in the example below is important: it ensures that access to the
`manhole` is only possible for local users).
```yaml
listeners:
- port: 9000
bind_addresses: ['::1', '127.0.0.1']
type: manhole
```
### Security settings
The following config options are available:
- `username` - The username for the manhole (defaults to `matrix`)
- `password` - The password for the manhole (defaults to `rabbithole`)
- `ssh_priv_key` - The path to a private SSH key (defaults to a hardcoded value)
- `ssh_pub_key` - The path to a public SSH key (defaults to a hardcoded value)
For example:
```yaml
manhole_settings:
username: manhole
password: mypassword
ssh_priv_key: "/home/synapse/manhole_keys/id_rsa"
ssh_pub_key: "/home/synapse/manhole_keys/id_rsa.pub"
```
## Accessing synapse manhole
Then restart synapse, and point an ssh client at port 9000 on localhost, using
the username and password configured in `homeserver.yaml` - with the default
configuration, this would be:
```bash
ssh -p9000 matrix@localhost
```
Then enter the password when prompted (the default is `rabbithole`).
This gives a Python REPL in which `hs` gives access to the
`synapse.server.HomeServer` object - which in turn gives access to many other
parts of the process.
Note that, prior to Synapse 1.41, any call which returns a coroutine will need to be wrapped in `ensureDeferred`.
As a simple example, retrieving an event from the database:
```pycon
>>> from twisted.internet import defer
>>> defer.ensureDeferred(hs.get_datastores().main.get_event('$1416420717069yeQaw:matrix.org'))
<Deferred at 0x7ff253fc6998 current result: <FrozenEvent event_id='$1416420717069yeQaw:matrix.org', type='m.room.create', state_key=''>>
```
|
