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swarm-logs-auth: check agent tokens on the log store's query route

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A new `auth_request` responder on the log store's host. nginx sends it
every `/select/logsql/` request whose `Authorization` is
`Bearer swarm-agent.<agent>.<secret>`; it answers 200 when the secret is
the one stored at `swarm/agents/<agent>/queue` (`swarm-agent-verify`),
401 otherwise. Every other bearer still goes to authelia, so agents
still presenting the hive's shared OIDC client keep working.

`auth_request` takes a fixed URI, so the split is a `map` on
`$http_authorization` plus an internal location that rewrites to the
map's pick. Checked against nginx 1.30.5 with stub upstreams: an agent
token only the stub validator accepts gets 200, a token only the stub
authelia accepts gets 200, every wrong one 401, and the internal
locations 404 from outside.

The responder serves a unix socket in its own traverse-only runtime
directory and reads the store under its own leaf
(`swarm-logs-auth`), whose policy is `swarm/agents/+/queue`, read-only.
glue-bao-tls mints the leaf where the store runs; elsewhere the
operator places it, and eval refuses a log store host without one.

Part of #4459.
This commit is contained in:
atlas 2026-10-12 22:48:19 +02:00 • committed by mara
commit 1f4736e79b
16 changed files with 515 additions and 9 deletions
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38
nix/module-eval/core-toggle.nix
View file

@ -504,6 +504,44 @@ let
&& !(lib.hasInfix "$args" q.extraConfig)
&& !(lib.hasInfix "?" q.proxyPass);
}
{
# `auth_request` takes a fixed URI, so the split between the agents'
# responder and authelia is a map plus a rewrite in an internal
# location. Every link of that chain is pinned: the map keys on the
# agent-token prefix and falls back to authelia, the query location
# names the switch, the switch rewrites to the map's pick, and the
# agent target reaches the responder's socket, which the unit binds.
name = "the machine query location sends agent bearers to swarm-logs-auth and the rest to authelia";
ok =
let
l = allLocal.services.nginx.virtualHosts."logs.t.local".locations;
http = allLocal.services.nginx.appendHttpConfig;
unit = allLocal.systemd.services.swarm-logs-auth;
in
lib.hasInfix "map \$http_authorization \$swarm_logs_auth_target" http
&& lib.hasInfix "\"~^Bearer swarm-agent\\.\" /__swarm_logs_agent_auth;" http
&& lib.hasInfix "default /__hive_authelia;" http
&& lib.hasInfix "auth_request /__swarm_logs_auth;" l."^~ /select/logsql/".extraConfig
&& lib.hasInfix "rewrite ^ \$swarm_logs_auth_target last;" l."= /__swarm_logs_auth".extraConfig
&& lib.hasInfix "internal;" l."= /__swarm_logs_agent_auth".extraConfig
&& l."= /__swarm_logs_agent_auth".proxyPass == "http://unix:/run/swarm-logs-auth/auth.sock:/"
&& lib.hasInfix "--socket /run/swarm-logs-auth/auth.sock" unit.serviceConfig.ExecStart
&& l ? "= /__hive_authelia";
}
{
# The responder reads the store as itself, with the leaf the store's
# host mints for it.
name = "swarm-logs-auth presents its own store leaf";
ok =
let
v = allLocal.services.hyperhive.deploy.victorialogs;
lc = allLocal.systemd.services.swarm-logs-auth.serviceConfig.LoadCredential;
in
lib.hasSuffix "/logs-auth.pem" v.authBaoClientCertFile
&& lib.hasSuffix "/logs-auth-key.pem" v.authBaoClientKeyFile
&& builtins.elem "bao-client.pem:${v.authBaoClientCertFile}" lc
&& builtins.elem "bao-client-key.pem:${v.authBaoClientKeyFile}" lc;
}
{
# The absence arm for the case above, and the option's own rule — a
# service declares its entry under its own `enable` — made checkable.