100 lines
3.0 KiB
Markdown
100 lines
3.0 KiB
Markdown
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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**_Security Warning_**
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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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## Configuring the manhole
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To enable it, first uncomment the `manhole` listener configuration in
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`homeserver.yaml`. The configuration is slightly different if you're using docker.
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#### Docker config
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If you are using Docker, set `bind_addresses` to `['0.0.0.0']` as shown:
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```yaml
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listeners:
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- port: 9000
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bind_addresses: ['0.0.0.0']
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type: manhole
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```
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When using `docker run` to start the server, you will then need to change the command to the following to include the
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`manhole` port forwarding. The `-p 127.0.0.1:9000:9000` below is important: it
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ensures that access to the `manhole` is only possible for local users.
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```bash
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docker run -d --name synapse \
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--mount type=volume,src=synapse-data,dst=/data \
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-p 8008:8008 \
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-p 127.0.0.1:9000:9000 \
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matrixdotorg/synapse:latest
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```
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#### Native config
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If you are not using docker, set `bind_addresses` to `['::1', '127.0.0.1']` as shown.
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The `bind_addresses` in the example below is important: it ensures that access to the
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`manhole` is only possible for local users).
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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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### Security settings
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The following config options are available:
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- `username` - The username for the manhole (defaults to `matrix`)
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- `password` - The password for the manhole (defaults to `rabbithole`)
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- `ssh_priv_key` - The path to a private SSH key (defaults to a hardcoded value)
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- `ssh_pub_key` - The path to a public SSH key (defaults to a hardcoded value)
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For example:
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```yaml
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manhole_settings:
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username: manhole
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password: mypassword
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ssh_priv_key: "/home/synapse/manhole_keys/id_rsa"
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ssh_pub_key: "/home/synapse/manhole_keys/id_rsa.pub"
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```
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## Accessing synapse manhole
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Then restart synapse, and point an ssh client at port 9000 on localhost, using
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the username and password configured in `homeserver.yaml` - with the default
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configuration, this would be:
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```bash
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ssh -p9000 matrix@localhost
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```
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Then enter the password when prompted (the default 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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Note that, prior to Synapse 1.41, any call which returns a coroutine will need to be wrapped in `ensureDeferred`.
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As a simple example, retrieving an event from the database:
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```pycon
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>>> from twisted.internet import defer
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>>> defer.ensureDeferred(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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