Lonewolf 0.3 – A standalone XMPP server written in Rust

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The Details

Lonewolf v0.3.0 adds certificate-authenticated federation, direct TLS, and more desktop client features. It remains a pre-1.0, single-node server; full XMPP compliance and clustering remain on the roadmap.

Client and federation features

Federation exchanges messages, IQs, presence, and roster subscriptions with other XMPP servers. Hosts with configured certificates and public DNS names federate by default. Peers need trusted certificates and SASL EXTERNAL; Server Dialback is not supported.

Bidirectional connections (

XEP-0288) let compatible servers share one connection. Stream Limits Advertisement ( XEP-0478) exchanges federation stanza and idle limits.

XEP-0368) adds client and server listeners and combined STARTTLS/direct-TLS federation discovery.

Private XML Storage (

XEP-0049) stores private client settings and legacy bookmarks. Software Version ( XEP-0092) answers domain software queries, with operating system disclosure off by default. Both extensions are enabled by default.

Opt-in SCRAM-SHA-512 and SCRAM-SHA-512-PLUS implement an expired Internet-Draft, not an RFC or IANA-registered mechanism. Account creation and password changes write credentials older binaries cannot read, even when SHA-512 login is disabled.

The standards reference records supported roles and limits.

Operations and tooling

Federation checks CA-published CRLs over plain HTTP by default. Downloaded checks allow unknown revocation status; s2s.tls.fetch_crls = false disables downloads. A configured s2s.tls.crls_path uses only the local file. letsencrypt.certificate_profile selects a CA-advertised profile, including short-lived certificates. Profile changes trigger early renewal.

The default client stanza limit falls from 512 KiB to 256 KiB. Traffic byte counters now include TLS handshake and record overhead.

The benchmark executable and crate are now lonewolfbench, replacing lonewolf-bench.

See the configuration reference for settings and defaults.

• Build from source
• Download and extract
• Source code (tar.gz) or

Source code (zip) below, then run: cargo build --release --locked -p lonewolf -p lonewolfctl -p lonewolfbench Build on Linux or macOS with a stable Rust toolchain and a system linker. See the quick start for setup.

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