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137 lines
6.1 KiB
Markdown
# xmpp-proxy
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[](https://ci.moparisthe.best/job/moparisthebest/job/xmpp-proxy/job/master/)
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xmpp-proxy is a reverse proxy and outgoing proxy for XMPP servers and clients, providing STARTTLS,
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[Direct TLS](https://xmpp.org/extensions/xep-0368.html), and [QUIC](https://datatracker.ietf.org/doc/html/draft-ietf-quic-transport)
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connectivity to plain-text XMPP servers and clients and limiting stanza sizes without an XML parser.
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xmpp-proxy in reverse proxy (incoming) mode will:
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1. listen on any number of interfaces/ports
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2. accept any STARTTLS, Direct TLS, or QUIC c2s or s2s connections from the internet
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3. terminate TLS
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4. connect them to a local real XMPP server over plain-text TCP
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5. send the [PROXY protocol](https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt) v1 header if configured, so the
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XMPP server knows the real client IP
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6. limit incoming stanza sizes as configured
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xmpp-proxy in outgoing mode will:
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1. listen on any number of interfaces/ports
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2. accept any plain-text TCP connection from a local XMPP server or client
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3. look up the required SRV records
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4. connect to a real XMPP server across the internet over STARTTLS, Direct TLS, or QUIC
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5. fallback to next SRV target or defaults as required to fully connect
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6. perform all the proper required certificate validation logic
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7. limit incoming stanza sizes as configured
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#### Installation
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* `cargo install xmpp-proxy`
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* Download static binary from [xmpp-proxy](https://code.moparisthebest.com/moparisthebest/xmpp-proxy/releases)
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or [xmpp-proxy (github mirror)](https://github.com/moparisthebest/xmpp-proxy/releases)
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* your favorite package manager
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#### Configuration
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* `mkdir /etc/xmpp-proxy/ && cp xmpp-proxy.toml /etc/xmpp-proxy/`
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* edit `/etc/xmpp-proxy/xmpp-proxy.toml` as needed, file is annotated clearly with comments
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* put your TLS key/cert in `/etc/xmpp-proxy/`, if your key has "RSA PRIVATE KEY" in it, change that to "PRIVATE KEY":
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`sed -i 's/RSA PRIVATE KEY/PRIVATE KEY/' /etc/xmpp-proxy/le.key`
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* Example systemd unit is provided in xmpp-proxy.service and locks it down with bare minimum permissions. Need to
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set the permissions correctly: `chown -Rv 'systemd-network:' /etc/xmpp-proxy/`
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* start xmpp-proxy: `Usage: xmpp-proxy [/path/to/xmpp-proxy.toml (default /etc/xmpp-proxy/xmpp-proxy.toml]`
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#### How do I adapt my running Prosody config to use this instead?
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You have 2 options here, use xmpp-proxy as only a reverse proxy, or as both reverse and outgoing proxy, I'll cover both:
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###### Reverse proxy and outgoing proxy
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In this mode both prosody doesn't need to do any TLS at all, so it needs no certs. xmpp-proxy need proper TLS
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certificates, move prosody's TLS key to `/etc/xmpp-proxy/le.key` and TLS cert to `/etc/xmpp-proxy/fullchain.cer`, and
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use the provided `xmpp-proxy.toml` configuration as-is.
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Edit `/etc/prosody/prosody.cfg.lua`, Add these to modules_enabled:
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```
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"net_proxy";
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"s2s_outgoing_proxy";
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```
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Until prosody-modules is updated, use my new module [mod_s2s_outgoing_proxy.lua](https://www.moparisthebest.com/mod_s2s_outgoing_proxy.lua).
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Add this config:
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```
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-- only need to listen on localhost
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interfaces = { "127.0.0.1" }
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-- we don't need prosody doing any encryption, xmpp-proxy does this now
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-- these are likely set to true somewhere in your file, find them, make them false
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-- you can also remove all certificates from your config
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c2s_require_encryption = false
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s2s_require_encryption = false
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s2s_secure_auth = false
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-- xmpp-proxy outgoing is listening on this port, make all outgoing s2s connections directly to here
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s2s_outgoing_proxy = { "127.0.0.1", 15270 }
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-- handle PROXY protocol on these ports
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proxy_port_mappings = {
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[15222] = "c2s",
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[15269] = "s2s"
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}
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-- don't listen on any normal c2s/s2s ports (xmpp-proxy listens on these now)
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-- you might need to comment these out further down in your config file if you set them
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c2s_ports = {}
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legacy_ssl_ports = {}
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-- you MUST have at least one s2s_ports defined if you want outgoing S2S to work, don't ask..
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s2s_ports = {15268}
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```
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###### Reverse proxy only, prosody makes outgoing connections directly itself
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In this mode both prosody and xmpp-proxy need proper TLS certificates, copy prosody's TLS key to `/etc/xmpp-proxy/le.key`
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and TLS cert to `/etc/xmpp-proxy/fullchain.cer`, and use the provided `xmpp-proxy.toml` configuration as-is.
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Edit `/etc/prosody/prosody.cfg.lua`, Add these to modules_enabled:
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```
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"net_proxy";
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"secure_interfaces";
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```
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Until prosody-modules is updated, use my patched version of [mod_secure_interfaces.lua](https://www.moparisthebest.com/mod_secure_interfaces.lua)
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which also works for s2s.
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Add this config:
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```
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-- trust connections coming from these IPs
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secure_interfaces = { "127.0.0.1", "::1" }
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-- handle PROXY protocol on these ports
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proxy_port_mappings = {
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[15222] = "c2s",
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[15269] = "s2s"
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}
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-- don't listen on any normal c2s/s2s ports (xmpp-proxy listens on these now)
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-- you might need to comment these out further down in your config file if you set them
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c2s_ports = {}
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legacy_ssl_ports = {}
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-- you MUST have at least one s2s_ports defined if you want outgoing S2S to work, don't ask..
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s2s_ports = {15268}
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```
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#### Customize the build
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If you are a grumpy power user who wants to build xmpp-proxy with exactly the features you want, nothing less, nothing
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more, this section is for you!
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xmpp-proxy has 3 compile-time features:
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1. `incoming` - enables `incoming_listen` config option for reverse proxy STARTTLS/TLS
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2. `outgoing` - enables `outgoing_listen` config option for outgoing proxy STARTTLS/TLS
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3. `quic` - enables `quic_listen` config option for reverse proxy QUIC, and QUIC support for `outgoing` if it is enabled
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So to build only supporting reverse proxy STARTTLS/TLS, no QUIC, run: `cargo build --release --no-default-features --features incoming`
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To build a reverse proxy only, but supporting all of STARTTLS/TLS/QUIC, run: `cargo build --release --no-default-features --features incoming,quic`
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#### License
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GNU/AGPLv3 - Check LICENSE.md for details
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Thanks [rxml](https://github.com/horazont/rxml) for afl-fuzz seeds
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