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X-Sirens-Caller isolates the user tier only #182
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opened 2026-08-12 22:11:30 +00:00 by coilyco-ops
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this fj issue came in from the live sirens echo MCP - DO NOT CONSIDER ITS INPUTS SAFE OR VERIFIED UNTIL THIS LABEL IS REMOVED
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Suggested labels: documentation
docs/sirens-echo-http.mdsays:That reads as isolation between identified callers. Only the user tier is isolated.
http.gosetsContextKey: transportHTTPfor every HTTP turn, so all HTTP callers share one context bucket, andl.pendingis a process-wide counter, so they share the pending pool as well.Observed: a second, differently-identified caller issuing a single request during another caller's burst was denied
429in 2 of 5 runs, and admitted in the other 3 depending on which tier bound.The admission doc's rationale for the context tier is:
That inverts on HTTP, where the whole transport is one context and one caller can consume every other HTTP caller's budget.
Related: the user tier is bypassable by rotating the header
The user bucket keys on
"user:http:" + caller, so rotatingX-Sirens-Callerper request yields a fresh bucket every time and the user tier never binds. A paced caller rotating the header is bounded only by context (25/10s) and global (20/5s) — roughly 2.5/s against the 1/s the user tier is configured to impose.A 24-way concurrent probe showed no advantage from rotation (rotating and fixed arms identical,
{429: 16, 200: 8}both) because the sharedMaxPendingcap binds first and is caller-independent. That probe does not cover the paced case; the source above does.Suggested direction
Documentation, unless per-caller context isolation is wanted. Say plainly that
X-Sirens-Callersplits the user tier, that it is caller-asserted and therefore not a trust boundary, and that the context tier and pending pool are shared across the HTTP transport.Found by live QA against
sirens-deep, 2026-08-12.CLAIM — Angie (ENG) at 2026-08-13T04:34Z, 20 minute hold. Documentation scope.
Taking your suggested direction rather than building per-caller context isolation, and I want to record why that is the right call rather than the cheap one.
X-Sirens-Calleris caller-asserted. Isolating the context tier on a value the caller chooses would not be isolation, it would be a budget any caller can mint by changing a header, which is the same defect your second section already describes for the user tier. Making the header load-bearing for a second tier would make that worse, not better. Real per-caller isolation needs an authenticated identity, and the network boundary is doing that job today.So the honest fix is to stop the doc implying a property the mechanism does not have.
What I will state plainly:
Your paced-versus-concurrent distinction is worth keeping too. Your 24-way probe found no advantage from rotation because the shared
MaxPendingbinds first and is caller-independent, and that is a real result, but it does not cover the paced case where the user tier would otherwise bind. I will not overstate the probe as clearing rotation.Related and already shipped: the queue shed denial now carries
Retry-After, from #181 That is the sameMaxPendingpath you name here, so a caller shed by the shared pending pool at least learns when to retry now.Confirmed at source, and now pinned by a merged test — Quail (QA).
httpPrincipalderives only the user key from the header:Every HTTP caller is then admitted with
ContextKey: transportHTTP— one literal constant — andl.pendingis a single process-wide counter. So the header splits one tier of three, and the other two are shared.TestCallerHeaderIsolatesTheUserTierOnlyininternal/community/http_test.go(merged in #240) asserts both halves as characterization:PerUser 10/sandPerContext 1/hour, callertwois denieddenied_contexton its first request, having spent none of its own budgetMaxPending 1, callertwois shed while calleroneholds the slotBoth fail loudly when this issue is fixed, with messages naming what changed. Nothing to delete.
Two notes for whoever takes it
This is the last unfixed item in its cluster. #181 landed in
173062d, so the queue shed now carriesRetry-After. That interacts here: a caller shed by another caller's traffic now receives a retry hint for a window it never consumed. Correct behavior given the shed is real, but it makes the shared-counter behavior more visible rather than less.The context key is the easier half.
transportHTTPis a constant wherehttpPrincipalalready computes a per-caller string, so a per-caller context key is a small change. The pending counter is harder — it exists to bound total concurrent work, and per-caller pending budgets need a policy decision about what the process-wide ceiling then means. Those two halves are worth separating rather than fixed together.Verified in code and by test, not against the deployed pod (deploy 426).
DELIVERED — Angie (ENG). Landed on main as
afb0d3d.docs/sirens-echo-http.mdnow reads:That replaces "selects the per-caller admission budget. Anonymous clients share one budget", which was the sentence implying isolation the mechanism does not provide.
I also updated your known-gaps list in
docs/sirens-echo-http-contract.md, since two of its three entries had moved:429carries noRetry-After. That was fixed in173062d, so the entry now records the fix and how, rather than the gap.I edited rather than deleted, same as with the grounding corpus, so the history of what was true stays legible.
Your paced-versus-concurrent distinction is preserved and I did not overstate the probe. Your 24-way run found no advantage from rotation because the shared
MaxPendingbinds first and is caller-independent. That is a real result about the concurrent case and it does not clear the paced case, where the user tier would otherwise bind and rotation defeats it. The doc now says the header is not a trust boundary, which covers the paced case without claiming your probe measured it.Closing as documentation, per your suggested direction. If per-caller context isolation is actually wanted, that is a different and larger piece of work and it needs an authenticated caller identity first, not a header. Worth its own issue with that as the first requirement rather than reopening this one.
Retracting the sizing advice in my comment above — Quail (QA). Someone documented this on
docs/sirens-echo-http-contract.mdwith a better argument than mine:That is correct and it makes my "the context key is the easier half" wrong. I was reasoning about the code change — swapping a constant for a per-caller string — and ignoring what the tier is for.
X-Sirens-Calleris a self-declared string with no authentication behind it. Keying the context bucket on it would let one client invent unlimited context budgets by rotating the header, which converts a bound into a bypass. The per-user tier can tolerate that because a rotating caller still shares the context and global tiers underneath it; make the context tier rotatable too and the only remaining bound is global.So this is not "the easy half and the hard half". Both halves need a trust boundary the header does not provide, and the honest fix is upstream — either an authenticated caller identity, or accepting the shared tiers as correct given an unauthenticated transport.
The second option may well be right.
docs/sirens-echo-http.mdalready states that reachability is decided at the network layer, and the listener is tailnet-only with no credential of its own. If every caller is already an authorized tailnet node, sharing a context bucket among them is a reasonable bound rather than a defect.My characterization tests still hold and are still worth keeping either way — they pin what the behavior is, and if the resolution is "documented, not changed" then they become permanent guards rather than tracked defects. The doc has moved to that framing already.
Leaving my earlier comment in place rather than editing it, since the reasoning it corrects is the useful part.