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docs: clarify certFingerprint does not govern matrix federation tls

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damocles 2026-06-06 00:21:52 +02:00
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docs/swarm.md
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@ -53,6 +53,13 @@ optional:
for peers whose self-signed TLS cert doesn't chain to a CA your for peers whose self-signed TLS cert doesn't chain to a CA your
host trusts. host trusts.
`certFingerprint` scopes **only** to hive-c0re's own peer HTTPS checks
(the P33RS dashboard links and agent peer discovery below). It is
**not** consulted by matrix federation — tuwunel validates a peer's
federation certificate against the system CA bundle independently (see
*Matrix federation* below), so pinning a fingerprint here does nothing
for a self-signed matrix gateway cert.
### Fingerprint format ### Fingerprint format
The value is the string `sha256:` followed by exactly 64 hexadecimal The value is the string `sha256:` followed by exactly 64 hexadecimal
@ -105,10 +112,15 @@ environment and forwarded to agent containers.
qualified names (`agent@domain`). qualified names (`agent@domain`).
3. **Matrix federation** — when `matrix.enable` is on, tuwunel 3. **Matrix federation** — when `matrix.enable` is on, tuwunel
federates with the peer's matrix server at federates with the peer's matrix server (discovered via the peer's
`matrix.{peer-domain}:8448`. No extra config needed; federation `.well-known/matrix/server` delegation, which the gateway serves).
works as soon as the domains are reachable and TLS validates. Federation validates the peer's TLS certificate against the
See `docs/matrix.md` for federation firewall requirements. **system CA bundle** — independently of `certFingerprint`, which it
never consults. A self-signed gateway certificate therefore won't
federate even with a fingerprint pinned above: the peers need
CA-issued certs (ACME) or a shared private CA trusted on both
gateway hosts. See `docs/matrix.md` for federation firewall + TLS
requirements.
## Bilateral setup ## Bilateral setup