2021-08-05 13:20:05 +02:00
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# Using a forward proxy with Synapse
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You can use Synapse with a forward or outbound proxy. An example of when
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this is necessary is in corporate environments behind a DMZ (demilitarized zone).
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Synapse supports routing outbound HTTP(S) requests via a proxy. Only HTTP(S)
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proxy is supported, not SOCKS proxy or anything else.
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## Configure
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The `http_proxy`, `https_proxy`, `no_proxy` environment variables are used to
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specify proxy settings. The environment variable is not case sensitive.
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- `http_proxy`: Proxy server to use for HTTP requests.
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- `https_proxy`: Proxy server to use for HTTPS requests.
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- `no_proxy`: Comma-separated list of hosts, IP addresses, or IP ranges in CIDR
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format which should not use the proxy. Synapse will directly connect to these hosts.
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The `http_proxy` and `https_proxy` environment variables have the form: `[scheme://][<username>:<password>@]<host>[:<port>]`
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- Supported schemes are `http://` and `https://`. The default scheme is `http://`
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for compatibility reasons; it is recommended to set a scheme. If scheme is set
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to `https://` the connection uses TLS between Synapse and the proxy.
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**NOTE**: Synapse validates the certificates. If the certificate is not
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valid, then the connection is dropped.
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- Default port if not given is `1080`.
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- Username and password are optional and will be used to authenticate against
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the proxy.
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**Examples**
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- HTTP_PROXY=http://USERNAME:PASSWORD@10.0.1.1:8080/
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- HTTPS_PROXY=http://USERNAME:PASSWORD@proxy.example.com:8080/
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- NO_PROXY=master.hostname.example.com,10.1.0.0/16,172.30.0.0/16
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**NOTE**:
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Synapse does not apply the IP blacklist to connections through the proxy (since
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the DNS resolution is done by the proxy). It is expected that the proxy or firewall
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will apply blacklisting of IP addresses.
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## Connection types
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The proxy will be **used** for:
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- push
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- url previews
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- phone-home stats
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- recaptcha validation
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- CAS auth validation
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- OpenID Connect
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- Outbound federation
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- Federation (checking public key revocation)
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- Fetching public keys of other servers
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- Downloading remote media
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It will **not be used** for:
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- Application Services
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- Identity servers
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- In worker configurations
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- connections between workers
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- connections from workers to Redis
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## Troubleshooting
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If a proxy server is used with TLS (HTTPS) and no connections are established,
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it is most likely due to the proxy's certificates. To test this, the validation
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in Synapse can be deactivated.
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**NOTE**: This has an impact on security and is for testing purposes only!
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To deactivate the certificate validation, the following setting must be made in
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[homserver.yaml](../usage/configuration/homeserver_sample_config.md).
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```yaml
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use_insecure_ssl_client_just_for_testing_do_not_use: true
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```
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