b807189692
With DynamicUser=true and RuntimeDirectoryPreserve=yes, systemd creates the unit's runtime directory under /run/private/ (0700 root:root) and symlinks /run/swarm-logs-auth to it (systemd.exec(5), RuntimeDirectoryPreserve=). nginx runs as the unprivileged nginx user, so its connect() to /run/swarm-logs-auth/auth.sock failed with EACCES, the auth subrequest ended in a 502, and auth_request answered every agent bearer on /select/logsql/ with a 500. The unit now runs as a static swarm-logs-auth system user and group, the shape swarm-controller already uses for its 0751 + Preserve socket dir. RestrictSUIDSGID and RemoveIPC, which DynamicUser implied and the unit did not set itself, are set explicitly. module-eval-core-toggle gains a case that fails when any unit creating the runtime directory of a unix: upstream of nginx combines DynamicUser with RuntimeDirectoryPreserve. docs/process/gotchas.md records the trap. Fixes #5235
489 lines
22 KiB
Nix
489 lines
22 KiB
Nix
# The swarm's log store: one VictoriaLogs for the whole swarm, in a
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# `swarm-victorialogs` nixos-container beside the metrics store it mirrors.
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#
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# Why a store at all rather than reading journals directly: an agent can
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# verify that a unit was *launched* and never that it is *working*. The
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# container journals are not reachable from an agent, so a diagnosis stops at
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# the first component that is broken — which is precisely the component whose
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# own instrument is least likely to be legible. Collecting logs centrally
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# makes the question answerable without host access.
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#
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# It is the collector that feeds this, not the services directly: one ingest
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# point per swarm, same shape as the metrics path.
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#
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# Gateway vhost is authenticated, unlike the metrics store's: an operator
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# reaches this at `https://${cfg.domain}/` gated by the same `auth_request`
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# check against authelia that swarm-ui's own vhost uses (`swarmAuthRequest`
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# below, same shape as `swarm-ui.nix`'s) — see that file's copy for the full
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# rationale (forceSSL is load-bearing there too: authelia answers a plain-http
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# auth subrequest with 400, which `auth_request` cannot interpret as anything
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# but a broken check). The store's own listener stays loopback-only and
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# unauthenticated, and the vhost is now the ONLY way in from outside: the
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# collector pushes through it too, at its own `= /insert/...` location, because
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# a swarm has one log store and the collector need not share a host with it.
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# ⚠️ That ingest location deliberately does not carry `swarmAuthRequest` — a
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# pusher handed its `error_page 401 =302` follows the redirect and POSTs at a
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# login page, which answers 200. See the location itself.
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#
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# The query API has a machine route of the same shape at `^~ /select/logsql/`,
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# for the same reason, and with no filtering of what an authenticated caller
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# may read — see that location.
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{
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pkgs,
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lib,
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config,
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...
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}:
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let
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cfg = config.services.hyperhive.swarm.victorialogs;
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deployCfg = config.services.hyperhive.deploy;
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networkCfg = config.services.hyperhive.network;
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hyperhiveCfg = config.services.hyperhive;
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gatewayCfg = hyperhiveCfg.gateway;
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# Copy of `swarm-ui.nix`'s own `swarmAuthRequest` — not shared code because
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# this vhost needs exactly the two locations that reference it (`/` and the
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# internal auth-request target below) and pulling in swarm-ui.nix for one
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# string would couple this module to swarm-ui existing at all, which it
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# need not. Same three lines, same reasoning as that file's own comment.
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swarmAuthRequest = ''
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auth_request /__hive_authelia;
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auth_request_set $target_url $scheme://$http_host$request_uri;
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error_page 401 =302 https://${hyperhiveCfg.swarm.authelia.domain}/?rd=$target_url;
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'';
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# The agents' `auth_request` responder (`swarm-logs-auth`). Its socket's
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# directory holds that socket alone and is traverse-only for others, the
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# shape `swarm-controller.nix` gives its own.
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logsAuthUnit = "swarm-logs-auth";
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logsAuthSocket = "/run/${logsAuthUnit}/auth.sock";
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logsAuthCredential = id: "/run/credentials/${logsAuthUnit}.service/${id}";
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# Credential id → host path of the responder's store identity.
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logsAuthStoreFiles = {
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"bao-client.pem" = deployCfg.victorialogs.authBaoClientCertFile;
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"bao-client-key.pem" = deployCfg.victorialogs.authBaoClientKeyFile;
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}
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// lib.optionalAttrs (deployCfg.bao.serverCaFile != null) {
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"bao-ca.pem" = deployCfg.bao.serverCaFile;
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};
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baoCfg = hyperhiveCfg.swarm.bao;
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# Shared host netns, like every sibling swarm container: Grafana reaches
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# this at 127.0.0.1:<port>.
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privateNetwork = false;
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in
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{
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# What the store IS from any hive's point of view, the name it answers on and
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# the port, is `swarm.victorialogs` in ./swarm-victorialogs-service.nix.
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# `enable`, `package` and `retentionPeriod` are decisions of the host that
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# runs it and live under `deploy.*`.
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# Retention is a property of the store this host runs, not something the
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# swarm has to agree on: it is read only where the container is defined,
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# and a hive that is a *client* of the log store never consults it. That
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# makes it a `deploy.*` value by the same rule as the seal on the secret
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# store — options on the auto-deployed service itself.
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options.services.hyperhive.deploy.victorialogs.package = lib.mkOption {
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type = lib.types.package;
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default = pkgs.victorialogs;
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defaultText = lib.literalExpression "pkgs.victorialogs";
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description = "VictoriaLogs package to run.";
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};
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options.services.hyperhive.deploy.victorialogs.retentionPeriod = lib.mkOption {
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type = lib.types.str;
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default = "30d";
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example = "90d";
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description = ''
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How long log data is kept.
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Deliberately far shorter than the metrics store's retention: logs
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are orders of magnitude larger per unit of time, and their value
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decays much faster. A log line answers "what happened during that
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incident"; a metric answers "is this worse than last quarter".
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authPackage = lib.mkOption {
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type = lib.types.package;
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defaultText = lib.literalExpression "hyperhive.packages.\${system}.swarm-logs-auth";
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description = ''
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The `swarm-logs-auth` package: the gateway's `auth_request` responder
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that checks an agent's `swarm-agent.<agent>.<secret>` bearer on
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`/select/logsql/` against the secret store.
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authBaoClientCertFile = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "/var/lib/swarm-bao-pki/logs-auth.pem";
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description = ''
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Client certificate `swarm-logs-auth` presents to the swarm's secret store
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to read agents' queue secrets. Its subject must be
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{option}`services.hyperhive.deploy.bao.logsAuthCommonName`.
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Required when `deploy.victorialogs.enable` is set; unset fails at eval.
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./glue-logs-auth-bao-identity.nix points it at the leaf
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./glue-bao-tls.nix mints on a host that runs the store; on any other
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log-store host it is a file the operator places.
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A path, never a value.
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authBaoClientKeyFile = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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example = "/var/lib/swarm-bao-pki/logs-auth-key.pem";
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description = ''
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Private key for {option}`services.hyperhive.deploy.victorialogs.authBaoClientCertFile`.
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A path, never a value.
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authVerdictTtl = lib.mkOption {
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type = lib.types.ints.unsigned;
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default = 60;
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description = ''
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Seconds `swarm-logs-auth` grants an agent bearer it has verified again
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without reading the secret store. A denial is never remembered.
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This is also how long a re-minted or deleted queue secret keeps working
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at the log store's query route after its last successful check. `0`
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checks the store on every query.
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authRate = lib.mkOption {
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type = lib.types.str;
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default = "50r/s";
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example = "30r/m";
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description = ''
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nginx `limit_req` rate, per client address, of `/select/logsql/`
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requests carrying a `swarm-agent.` bearer, which nginx checks with
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`swarm-logs-auth`. Each such request that the responder has not granted
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within {option}`services.hyperhive.deploy.victorialogs.authVerdictTtl`
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costs a secret store login and read, whether the bearer is right or not.
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Counts every agent query, granted or not, and is keyed by client address,
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so every agent on one host shares one budget. The default covers about a
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hundred agents on a host cold-starting at once, each costing one store
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login and read for its first query. Requests over the rate and its burst
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are answered 403.
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'';
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};
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options.services.hyperhive.deploy.victorialogs.authBurst = lib.mkOption {
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type = lib.types.ints.positive;
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default = 500;
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description = ''
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Requests a client address may make above
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{option}`services.hyperhive.deploy.victorialogs.authRate` before nginx
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answers 403, served without delay.
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'';
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};
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config = lib.mkIf deployCfg.victorialogs.enable {
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assertions = [
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{
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assertion =
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deployCfg.victorialogs.authBaoClientCertFile != null
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&& deployCfg.victorialogs.authBaoClientKeyFile != null;
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message = ''
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services.hyperhive.deploy.victorialogs.authBaoClientCertFile and
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authBaoClientKeyFile must both be set.
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swarm-logs-auth reads agents' queue secrets from the swarm's secret
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store with this certificate. They default to the leaf the store
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mints where services.hyperhive.deploy.bao.enable is set on this
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host; elsewhere, issue a leaf whose CN is
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services.hyperhive.deploy.bao.logsAuthCommonName and name it in
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both options.
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'';
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}
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];
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# Which check a `/select/logsql/` request gets. `auth_request` takes a
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# fixed URI, so it names `/__swarm_logs_auth`, which rewrites to the
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# target this map picks from the caller's `Authorization`.
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services.nginx.appendHttpConfig = ''
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map $http_authorization $swarm_logs_auth_target {
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"~^Bearer swarm-agent\." /__swarm_logs_agent_auth;
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default /__hive_authelia;
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}
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limit_req_zone $binary_remote_addr zone=swarm_logs_agent_auth:1m rate=${deployCfg.victorialogs.authRate};
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'';
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# The gateway name, inside `deployCfg.victorialogs.enable` — same
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# "only the host that runs the service may claim the name" guard every
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# sibling swarm-service module uses (`swarm-grafana.nix`,
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# `swarm-victoriametrics.nix`).
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services.hyperhive.gateway.localNames = [ cfg.domain ];
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# This host serves the vhost, and the container behind it resolves
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# through the hive's dnsmasq.
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services.hyperhive.gateway.enable = lib.mkDefault true;
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services.hyperhive.gateway.dns.enable = lib.mkDefault true;
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# Authenticated front door onto the loopback-only store — see the
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# file-top comment for why this is safe to add without touching the
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# store's own (still unauthenticated, still loopback) listener at all.
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# `removeAttrs`/`forceSSL`: same asymmetry `swarm-ui.nix` documents —
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# authelia answers a plain-http auth subrequest with 400, which
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# `auth_request` cannot read as anything but a broken check, so this
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# vhost needs `forceSSL` rather than the `addSSL` every unauthenticated
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# sibling vhost uses.
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services.nginx.virtualHosts."${cfg.domain}" =
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(builtins.removeAttrs (gatewayCfg.lib.tlsFor cfg.domain) [ "addSSL" ])
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// {
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forceSSL = true;
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listen = gatewayCfg.lib.listen;
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extraConfig = gatewayCfg.lib.securityHeaders;
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locations = {
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"/" = {
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proxyPass = "http://127.0.0.1:${toString cfg.port}/";
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extraConfig = swarmAuthRequest;
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};
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# The swarm collector's ingest route. `=` so it outranks the `/`
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# prefix above — without a more specific location it would ride that
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# catch-all, and that is the whole hazard here.
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#
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# ⚠️ Deliberately NOT `swarmAuthRequest`. That block ends in
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# `error_page 401 =302`, which is right for a browser and wrong for a
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# pusher: handed a redirect it follows the redirect and POSTs its
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# batch at a login page, which answers 200. Ingest then reports
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# healthy while storing nothing. A machine route lets the 401 reach
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# the client unchanged.
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#
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# `auth_request` does not inherit across sibling locations (see the
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# note on `swarmAuthRequest` above), so naming it here is required
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# rather than redundant.
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"= /insert/opentelemetry/v1/logs" = {
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proxyPass = "http://127.0.0.1:${toString cfg.port}/insert/opentelemetry/v1/logs";
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extraConfig = ''
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auth_request /__hive_authelia;
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'';
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};
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# The read side of that same split: the route a caller holding a
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# bearer token queries, as opposed to the `/` above which is the
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# operator's browser. Bare `auth_request` for the ingest route's
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# exact reason — `error_page 401 =302` hands an unauthenticated
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# machine caller authelia's login page as a **200 with an HTML
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# body**, so a client that reads the status code records a
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# successful query that returned no rows. 401 is the only answer
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# here that a caller cannot mistake for an empty result.
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#
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# `^~` so it outranks the `/` catch-all and stays ahead of any
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# regex location a later change adds. The prefix is the whole
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# LogsQL query API and nothing else — `query`, `tail`, `hits`,
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# `facets`, the `stats_query*` and the `field_*`/`stream_*`
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# routes — while the browser UI sits beside it under
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# `/select/vmui`. Both read off the pinned build, not the docs.
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#
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# The query is forwarded unmodified — no scoping parameter is
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# injected, so any authenticated caller reads the whole swarm's
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# logs. That is the rule in force, not an omission: read
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# permissions are a later thing, and this location is where one
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# attaches when it exists.
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#
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# Two checks: an agent's own `swarm-agent.` bearer goes to
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# `swarm-logs-auth`, anything else to authelia (`appendHttpConfig`
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# above picks).
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"^~ /select/logsql/" = {
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# No URI part, so the request path and its query string reach
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# the store as the caller sent them.
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proxyPass = "http://127.0.0.1:${toString cfg.port}";
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extraConfig = ''
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auth_request /__swarm_logs_auth;
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'';
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};
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# The store's own health, which it publishes as prometheus metrics
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# on the listener it serves queries on. The swarm collector requests
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# exactly this URL, declared as `publishedScrapeTargets.victorialogs`
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# in ./swarm-otel-service.nix; the two must agree, since that string
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# is also the token's audience.
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#
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# Bare `auth_request` to authelia, as on the ingest route above, and
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# never `/__swarm_logs_auth`, which admits an agent's bearer:
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# authelia's rules for this URL admit the collector's client and
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# deny every other subject (see `metricsRules` in ./swarm-authelia.nix).
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"= /metrics" = {
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proxyPass = "http://127.0.0.1:${toString cfg.port}/metrics";
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extraConfig = ''
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auth_request /__hive_authelia;
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'';
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};
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# `rewrite … last` re-matches locations, so the subrequest lands in
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# one of the two internal locations named by the map.
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"= /__swarm_logs_auth" = {
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extraConfig = ''
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internal;
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rewrite ^ $swarm_logs_auth_target last;
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'';
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};
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# The `Authorization` header rides the subrequest unchanged.
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#
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# Any well-formed agent bearer the responder has not recently granted
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# costs a secret store login and read, so the rate per client address
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# is capped here, ahead of the responder. 403 when over: the only
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# statuses `auth_request` passes through are 401 and 403, and
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# `swarm-logs` retries a 401.
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"= /__swarm_logs_agent_auth" = {
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proxyPass = "http://unix:${logsAuthSocket}:/";
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extraConfig = ''
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internal;
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limit_req zone=swarm_logs_agent_auth burst=${toString deployCfg.victorialogs.authBurst} nodelay;
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limit_req_status 403;
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proxy_pass_request_body off;
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proxy_set_header Content-Length "";
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'';
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};
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# The subrequest itself — same target, same header set, same
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# reasoning as `swarm-ui.nix`'s own copy (measured against the
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# pinned authelia binary, not copied from an example).
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"= /__hive_authelia" = {
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proxyPass = "https://${hyperhiveCfg.swarm.authelia.domain}/api/authz/auth-request";
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# nixpkgs appends its OWN `Host $host` after extraConfig,
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# which would override verifiedProxyTo's — see the comment
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# on verifiedProxyTo in hive-gateway/vhost-lib.nix.
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recommendedProxySettings = false;
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extraConfig = ''
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internal;
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${gatewayCfg.lib.verifiedProxyTo hyperhiveCfg.swarm.authelia.domain}
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proxy_pass_request_body off;
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proxy_set_header Content-Length "";
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proxy_set_header X-Original-Method $request_method;
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proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
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proxy_set_header X-Forwarded-Proto $scheme;
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proxy_set_header X-Forwarded-Host $http_host;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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'';
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};
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};
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};
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# The agents' check on `/select/logsql/`. On the host rather than in the
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# store's container: it needs nothing of the store, only nginx's reach to
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# its socket and its own store identity.
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users.users.${logsAuthUnit} = {
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isSystemUser = true;
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group = logsAuthUnit;
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description = "swarm log store auth_request responder";
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};
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users.groups.${logsAuthUnit} = { };
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systemd.services.${logsAuthUnit} = {
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description = "swarm log store auth_request responder for agent credentials";
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wantedBy = [ "multi-user.target" ];
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# Where the store's PKI is minted on this host, the leaf is one of its
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# files. Ordering only: elsewhere the unit does not exist.
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after = [
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"network.target"
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"swarm-bao-pki.service"
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];
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serviceConfig = {
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ExecStart = lib.concatStringsSep " " [
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"${deployCfg.victorialogs.authPackage}/bin/swarm-logs-auth"
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"--socket ${logsAuthSocket}"
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# The role ./swarm-bao.nix writes on the store's `cert` mount.
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"--store-cert-role swarm-logs-auth"
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"--verdict-ttl ${toString deployCfg.victorialogs.authVerdictTtl}"
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];
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# Paths only: `argv` is world-readable via /proc/<pid>/cmdline.
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LoadCredential = lib.mapAttrsToList (id: path: "${id}:${path}") logsAuthStoreFiles;
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# ⚠️ A static user, never `DynamicUser`: with `RuntimeDirectoryPreserve`
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# systemd puts a dynamic user's runtime directory under
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# `/run/private/` (0700 root:root), which nginx cannot traverse.
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User = logsAuthUnit;
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Group = logsAuthUnit;
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RuntimeDirectory = logsAuthUnit;
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# Traverse-only for others, so nginx reaches the socket path.
|
|
RuntimeDirectoryMode = "0751";
|
|
# The path never vanishes from under a running nginx; the responder
|
|
# unlinks a stale socket as it starts.
|
|
RuntimeDirectoryPreserve = "yes";
|
|
Restart = "on-failure";
|
|
RestartSec = "5s";
|
|
SyslogIdentifier = logsAuthUnit;
|
|
ProtectSystem = "strict";
|
|
ProtectHome = true;
|
|
PrivateTmp = true;
|
|
PrivateDevices = true;
|
|
NoNewPrivileges = true;
|
|
RestrictSUIDSGID = true;
|
|
RemoveIPC = true;
|
|
};
|
|
environment = {
|
|
BAO_ADDR = "https://${baoCfg.domain}:${toString baoCfg.port}";
|
|
BAO_CLIENT_CERT = logsAuthCredential "bao-client.pem";
|
|
BAO_CLIENT_KEY = logsAuthCredential "bao-client-key.pem";
|
|
}
|
|
// lib.optionalAttrs (logsAuthStoreFiles ? "bao-ca.pem") {
|
|
BAO_CACERT = logsAuthCredential "bao-ca.pem";
|
|
};
|
|
};
|
|
|
|
containers.${cfg.machine} = {
|
|
autoStart = true;
|
|
ephemeral = false;
|
|
# Journal files on the host, not inside the container: nixpkgs hardcodes
|
|
# --link-journal=try-guest, and EXTRA_NSPAWN_FLAGS expands after it.
|
|
extraFlags = [ "--link-journal=host" ];
|
|
inherit privateNetwork;
|
|
|
|
config =
|
|
{ ... }:
|
|
{
|
|
imports = [
|
|
../container-modules/swarm-container.nix
|
|
(import ../container-modules/swarm-container-resolver.nix {
|
|
inherit (networkCfg) bridgeIp;
|
|
dnsConsumers = [ "victorialogs.service" ];
|
|
})
|
|
];
|
|
|
|
services.hyperhive.swarmContainer = { inherit privateNetwork; };
|
|
|
|
services.victorialogs = {
|
|
enable = true;
|
|
package = deployCfg.victorialogs.package;
|
|
|
|
# ⚠️ PINNED TO LOOPBACK for the same reason the metrics store is,
|
|
# and it matters more here: upstream's default listens on every
|
|
# interface, and this endpoint accepts writes as well as reads.
|
|
# Nothing authenticates it either — upstream offers one basic-auth
|
|
# pair (`-httpAuth.username` / `-httpAuth.password`) and this
|
|
# module sets neither. The bind address is the boundary.
|
|
listenAddress = "127.0.0.1:${toString cfg.port}";
|
|
|
|
extraOptions = [ "-retentionPeriod=${deployCfg.victorialogs.retentionPeriod}" ];
|
|
};
|
|
};
|
|
};
|
|
};
|
|
|
|
# 🔑 OTLP ingest is served at `/insert/opentelemetry/v1/logs`, measured
|
|
# against the pinned build rather than read from docs. The path differs
|
|
# from the metrics store's `/opentelemetry/api/v1/push`, so an exporter
|
|
# configured by analogy with the metrics one is silently wrong.
|
|
#
|
|
# ⚠️ And the status code cannot tell you which is which: a wrong path, a
|
|
# right path with a wrong body, and a nonsense path ALL answer 400. Only
|
|
# the server log distinguishes them — the real route complains about the
|
|
# encoding ("json encoding isn't supported ... use protobuf"), while
|
|
# anything else logs "unsupported path requested". Verified with a
|
|
# nonsense-path control, because a probe where every arm returns the same
|
|
# code is not evidence.
|
|
#
|
|
# ⚠️ Like the metrics store's, that endpoint is unauthenticated — which is
|
|
# why `listenAddress` above is loopback and why nothing reaches it except
|
|
# through the gateway, where the ingest route is authenticated. (This module
|
|
# declares a vhost.)
|
|
}
|