PERF: App Password verification costs 0.4–5.5 s per DAV request under load (cache verified credentials, revoke-aware) #512
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opened 2026-09-30 11:01:30 +00:00 by kayg
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kayg/calternal#512
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Found by #500 (2026-09-30)
Under concurrent DAV load, App Password verification took 0.4–5.5 s per request, and SQLx pool acquisition about 2.3–2.5 s. Every CalDAV/CardDAV/WebDAV/IMAP request re-verifies the App Password, probably with a full slow password hash each time, so many syncing devices multiply the cost.
Fix
Starting #512 on job/apw-cache-512 from base SHA
558457cf32. I am locating the existing App Password verifier and designing the shared cache in the auth path so DAV and MCP use one implementation.Finding:
SqliteAuthStore::verify_app_passwordacquires the four-permit Argon gate, then selects the credential withfetch_optional(&self.pool). The server builds this store withfrom_pools(db.writer_pool(), db.reader_pool()), so every uncached DAV verification reads through the single-connection write pool before it starts Argon2. I will move verification reads to the reader pool and add one bounded, process-keyed positive cache insideSqliteAuthStore, shared by DAV and MCP.Branch sync:
git fetch origin && git merge origin/devcompleted as a fast-forward from558457cftocc25c441. The worktree was clean and there were no merge conflicts. I re-read the current auth decisions (§21) and kept the implementation incalternal-auth, shared by DAV and MCP.Core implementation is ready.
cargo clippyandcargo testpass forcalternal-authandcalternal-db;cargo clippy -p calternal-server --all-targets -- -D warningspasses after building the SPA required by RustEmbed. The server test target is still compiling. The cache uses a process-keyed BLAKE3 credential digest, 30-second TTL, 4,096-entry bound and mutation generations; the App Password SELECT now uses the read pool.Finding from the #512 implementation: the positive cache alone allowed simultaneous DAV misses for the same credential to all reach Argon2 before any request inserted a result. This cold-start stampede was visible in
verify_app_password: a cache miss proceeded directly to the reader query and bounded password verifier. I added per-key single-flight locks with a bounded overflow lock, plus a concurrency regression test. Auth crate gates are running now.Finding from the local 50-client DAV baseline: with 5 PROPFINDs per client, the pre-cache build returned 144 HTTP 429 responses out of 250 in the steady burst; all other responses were 207. The verifier waits at the four-slot Argon2 semaphore for up to five seconds, so valid requests under concurrent load can be rejected before completing. I updated the benchmark to retain 429 latency/status counts for the before run and to fail if the after run rate-limits a valid request.
Issue #512 complete.
Branch:
job/apw-cache-512Base:
cc25c441b7a974185622a1dee853cf38686d2b67HEAD:
0b97202885034f4b199200eb7e698ad690f3e645Built one App Password verification cache in
calternal-auth, shared by the Basic DAV and bearer App Password paths used by DAV/MCP. It uses a per-process keyed BLAKE3 digest, positive entries with a 30-second maximum TTL, immediate generation invalidation on credential/User mutations, and per-credential single-flight verification. Argon2 and App Password/User lookups stay off the single-writer pool. The SQLite read pool default is 64.The benchmark and raw data are in
bench/app-password-dav.pyanddocs/perf/runs/2026-10-01-issue-512-app-password-dav.md. The perf VM lock was busy, so this was a local Linux debug-binary comparison under high host load. With 50 clients × 5 PROPFIND requests, warm p95 fell from 6,241 ms to 315 ms; cold-start p95 fell from 5,995 ms to 856 ms. The before run returned 429 for 155/250 warm requests and 125/250 cold requests. The after run returned 207 for all requests.tests/adversarial/webdav.pypassed, and the next DAV request after revocation returned 401.Decisions not stated in DESIGN: use a 30-second cache TTL and a 4,096-entry cap to bound staleness and memory; use 64 read connections for 50 concurrent DAV clients plus background reads; use one shared overflow lock if more than 4,096 unique verifications are in flight. The writer pool remains single-connection.
Files changed:
crates/calternal-auth/Cargo.toml,crates/calternal-auth/src/store.rs,crates/calternal-db/src/db.rs,crates/calternal-server/src/wire.rs,bench/app-password-dav.py,docs/perf/README.md, and the threedocs/perf/runs/2026-10-01-issue-512-app-password-dav*result files.Gate output (verbatim):
Known gap: the requested perf VM release-binary run remains outstanding because
/root/perf.lockwas busy. The local comparison used debug binaries on a host with load averages around 29–33.Independent defensive review started on
job/apw-cache-review, base0b97202885034f4b199200eb7e698ad690f3e645(job/apw-cache-512). Scope: cache authority ordering, digest construction, resource bounds, DAV isolation and WAL visibility. No push or deploy.App Password cache review — #512
Base:
0b97202885034f4b199200eb7e698ad690f3e645.Local defects
insert_if_currentrejects cache insertion butverify_app_passwordreturnsSome(authority)without using that result. Fix: reject the current request as well. Add a two-worker ordering test, including zero TTL.hash.is_some() && verify_password(...)short-circuits. A dummy hash is parsed but not verified. Fix: always do the password check before checking row presence.spawn_blocking, the permit is dropped while the blocking task still runs. Fix: move an owned permit into the blocking task.Properties that need a design decision
HashMap<[u8; 32], ...>with ordinary array equality, not a constant-time comparison. A keyed digest makes chosen-digest control difficult, but this does not prove the requested constant-time property.wire.rsdoes not add a request concurrency cap or timeout.SqliteAuthStore::from_poolsconstructions do not share cache generations. The live server constructs one store and clones it. Independent stores or processes would need a shared invalidation design.Limits
Tests and gate results will be added after execution. Timing samples can detect large differences; they cannot prove constant-time execution. Work that changes the cache key design or the HTTP admission design is outside this local fix review.
Independent review progress:
9dc3e5601rejects stale in-flight authority, with a real verifier queued behind a held blocking worker;c100f7f78always runs the dummy hash. Both passed calternal-auth clippy and full tests. Timing diagnostic passed on this shared local debug build: invalid credential p50/p95 ms, known User 664.274/929.980, absent User 564.757/957.436, absent credential row 557.344/1923.225 (12 samples per class). These are coarse work checks, not a constant-time proof.Additional local finding: a credential can expire during Argon2. Zero cache TTL does not currently reject that completion; lookup also needs the absolute deadline after a clock change. I will fix that locally with a regression test.
Admission finding clarification: the accept loop bounds TCP connections under DESIGN §21. The cache flight map is bounded, but request waiters on its overflow lock have no acquisition deadline. The connection limits do not prove a request-level bound.
Additional local finding: both digest maps convert
blake3::Hashto[u8; 32]. The locked BLAKE3 1.8.7 source states that byte arrays lack its constant-time equality guarantee, and itsHash::PartialEqcallsconstant_time_eq_32. I am retainingblake3::Hashin both cache and flight maps, with compile-time key-type checks and functional mismatches at all 32 byte positions. This changes equality, not the keyed digest algorithm or key inputs.WAL regression passed: four existing reader connections each observed all 1,000 writer commits immediately. Auth review tests passed (75 passed, one timing diagnostic ignored and separately executed). The perf VM lock was busy at the nonblocking check; performance will be labelled local.
App Password cache review — #512
Head:
950ade5bcc9e71729d38d9c53e72bfbe6fba113b. Branch:job/apw-cache-review.Base:
0b97202885034f4b199200eb7e698ad690f3e645.Fixed local defects
A cold verification returns old authority when the mutation generation changes.
insert_if_currentrejects cache insertion butverify_app_passwordreturnsSome(authority)without using that result. Fix: reject the current request as well. Add a two-worker ordering test, including zero TTL.The missing credential row path skips Argon2 because
hash.is_some() && verify_password(...)short-circuits. A dummy hash is parsed but not verified. Fix: always do the password check before checking row presence.The Argon2 semaphore permit belongs to the request future. If that future is cancelled after
spawn_blocking, the permit is dropped while the blocking task still runs. Fix: move an owned permit into the blocking task.A row can expire between the SELECT and the end of Argon2. Zero TTL stops insertion but still accepts expired authority. Cache lookup also relies only on monotonic TTL after a wall-clock change. Fix: check the absolute deadline on completion and lookup.
The digest maps discard
blake3::Hashand use[u8; 32]. The locked BLAKE3 1.8.7 source explicitly warns that this conversion loses constant-time equality. Fix: retainblake3::Hashin both maps. Add compile-time map-key checks and mismatches at each byte.Properties that need a design decision
wire.rsdoes not add a request concurrency cap or timeout. DESIGN §21 and the TCP accept loop do bound connections (256 per direct peer; 4096 total through trusted proxies). A connection bound is not a per-request bound.SqliteAuthStore::from_poolsconstructions do not share cache generations. The live server constructs one store and clones it. Independent stores or processes would need a shared invalidation design.Evidence by property
blake3::Hashretains documented constant-time digest equality; compile-time map-key tests and 32 byte-position mismatches; 12 paired invalid samples per classFinal auth: 76 passed, one timing diagnostic ignored and separately executed. DB: 12 unit tests and 16 integration tests passed; one pre-existing test is ignored. Server: 94 passed, four ignored, including this live audit. The live audit passed separately: 1000 immediate revoke/DAV checks, two-User DAV isolation, and invalid response timing. It completed in 1324.56 seconds on the shared host. Timing samples can detect large differences; they cannot prove constant-time execution. Work that changes the cache key design or the HTTP admission design is outside this local fix review.
Timing evidence
Each invalid class has 12 samples. The p95 is the maximum sample under the nearest-rank method. These results are local debug measurements on a shared host.
The code selects credentials by credential ID, not username. For a wrong secret, it does not query the User row. An invalid username does not select another User. Successful warm and cold requests have different work by design; the performance profile measures both.
Decisions
Performance
The perf VM lock was busy. This run uses the local debug server at
950ade5bcc9e71729d38d9c53e72bfbe6fba113b, 50 clients, and five requests per client in each phase. All 500 responses were HTTP 207. After API revocation, the next TCP DAV request was HTTP 401.docs/perf/baseline.jsonhas no App Password DAV metric. The reference below is the existing local after-cache run indocs/perf/runs/2026-10-01-issue-512-app-password-dav.md. Host load and sample duration differ; this is not a controlled regression measurement.Review resource samples: three warm samples and five cold samples. Load averages were 15.53/17.49/22.33. Peak RSS was 177.9 MiB warm and 139.9 MiB cold. CPU percentage alone does not compare CPU cost per request when throughput differs. No perf-VM regression result is available.
Files and commits
crates/calternal-auth/src/store.rs: five local fixes, cache property tests, timing diagnostic and controlled worker-ordering tests.crates/calternal-db/src/db.rs: 1000 writer commits observed on four existing WAL readers.crates/calternal-server/src/wire.rs: 4-by-4 surface matrix; two-User DAV matrix; response timings; 1000 API-revoke/DAV checks.artifacts/apw-cache-review/findings.md: full review evidence and known gaps; not committed because artifacts are ignored.950ade5bcAdd DAV scope and revocation audit with repeated API writesf8df61943Preserve constant-time BLAKE3 digest equality in cache mapsb68869d0dVerify WAL readers observe a thousand committed writer updatesc2d71efe9Test cache bounds, User isolation and concurrent authority changes0c9fa11e0Recheck App Password expiry after verification and on cache hits7eb7e3c14Hold App Password hashing permits until blocking work finishesc100f7f78Always verify dummy App Password hashes to equalise missing-row work9dc3e5601Reject App Password results that overlap authority invalidationGates — verbatim output excerpts
cargo fmt --check: exit 0, no output.cargo clippy -p calternal-auth --all-targets -- -D warningscargo test -p calternal-authcargo clippy -p calternal-db --all-targets -- -D warningscargo test -p calternal-dbcargo clippy -p calternal-server --all-targets -- -D warningscargo test -p calternal-servercargo test -p calternal-server wire::tests::review_dav_cache_isolation_and_immediate_api_revocation -- --exact --ignored --nocapturecargo test -p calternal-auth review_invalid_credential_timing_distributions -- --ignored --nocaptureFull gate output is in the named log files under
artifacts/apw-cache-review/. The unchanged frontend production build passed as a server build prerequisite. No web source changed.Cleanup and disposition
No push or deploy. The required
git fetch originandgit merge origin/devcompleted withAlready up to date.No issue was closed. Doc comments in all three files were read again. The working tree is clean. Web build output and generated Python bytecode were removed.cargo cleanoutput:The five local defects are fixed and tested. The literal HMAC/User/scope-version requirement, flight-waiter admission bounds, and unconditional credential revocation on demotion or scope change remain unresolved. This report does not approve those properties by inference.
Round 2 started on job/apw-cache-review, base/head
950ade5bcc. I will close the explicit HMAC identity/scope key, bounded verification admission, and unconditional authority invalidation properties, then run per-crate gates and the live DAV/revocation profiles. No push or deployment.Finding: the same secret inserted for two Users collapsed to one positive entry (regression test: left 1, right 2). HMAC-SHA256 now binds fixed-size User ID, credential ID, scope version (mutation generation plus SHA256 of all scope restrictions), and credential secret. A separate bounded, domain-separated HMAC locator finds the full key without an Index read on warm hits. Production loads auth.app-password-cache.v1 once through the existing instance_secrets store and persists it on first startup; test-only standalone constructors use ephemeral restart-random keys. Targeted identity regression now passes. Existing overflow flight lock still requires the next fix.
Committed HMAC key slice
77ad26395and bounded admission slicebf8f61217. Auth clippy passed; auth tests: test result: ok. 80 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 78.14s. The combined 10,000 distinct bogus credentials + 1,000 same-credential waiters test passed with <=64 flights, <=64 followers per flight, <=256 admitted cold requests and <=4 hashes. Warm valid authentication passed during and after saturation. 429 now carries Retry-After: 1. The perf VM lock was busy at the nonblocking check; measurements will be local. Demotion currently clears the cache but reauthenticates the same credential with the new role; I will enforce the job’s next-request-fails requirement by revoking credentials on demotion and scope change.Mutation finding: clearing the cache on demotion still let the same secret authenticate as the new standard User. The new regression failed before the fix and passes after it. Demotion, disable and scope changes now retire the old credential transactionally. A change-window guard blocks cache hits/positive writes before the first write; an owned commit task holds it through commit even if the caller is cancelled. Multi-worker test passed 1,000 demotions, 1,000 disables, 1,000 scope changes and 1,000 physical deletions, each clearing unrelated positive entries and rejecting a late writer. Auth clippy passed; test result: ok. 83 passed; 0 failed; 1 ignored; 0 measured; 0 filtered out; finished in 102.46s. Two existing expectations were changed because this round explicitly requires next-request failure: demotion no longer reauthenticates the old secret as Member; scope change no longer returns new scopes through the old secret. A new credential is required. No new scope-edit HTTP endpoint was added.
Read-only review found two further edge cases. Regression evidence: suffix variants for one credential ID created 64 flights instead of 1; a correct credential during an unrelated change did not return retryable Unavailable. Both regressions failed on the previous slice. The fix now groups flights by canonical credential UUID under a separate HMAC domain. Active mutation contention returns 503 with Retry-After: 1; a late generation rejection rechecks only the exceptional credential/User state so real revocation/hash change/disable/delete remains 401, while unrelated change cannot increment the failure limiter. A deterministic queued-verifier test covers the late unrelated-change path. Follow-up read-only review found no remaining critical/important issue. New green tests and final gates are still running. origin/dev was fetched and merged once: Already up to date.
Round 2 complete on
job/apw-cache-review. Head:e076d611258627f151fa6be6149e37ae2f6e4194. Base:950ade5bcc9e71729d38d9c53e72bfbe6fba113b.Built:
Files: Cargo.lock; crates/calternal-auth/Cargo.toml; crates/calternal-auth/src/store.rs, error.rs, lib.rs; crates/calternal-server/src/wire.rs; bench/app-password-dav.py; docs/perf/runs/2026-10-01-issue-512-app-password-dav.md; docs/perf/runs/2026-10-01-issue-512-round2-app-password-dav.json. No calternal-db source change was needed.
Live validation: 50 clients, five requests each per phase, 250 HTTP 207 responses in each phase. Warm p50/p95: 123.027/150.034 ms; cold-start p50/p95: 88.960/626.574 ms. Warm mean CPU/RSS/peak RSS: 89.65%/153.9 MiB/155.7 MiB; cold: 108.15%/127.4 MiB/139.4 MiB. Host load: 11.47/12.77/19.26. All 1,000 live cycles returned warm 207, revoke 204, next DAV 401. The one scripted WebDAV adversarial round passed. Round 1 warm p50/p95 was 218/315 ms; cold was 224/856 ms. Neither p95 nor peak RSS crosses its published regression budget. docs/perf/baseline.json has no comparable App Password DAV profile. These are local debug measurements because the perf VM lock was busy.
Decisions:
Known gaps: quiet release measurement on the perf VM remains unavailable. No UI changed. Manual timing/throughput diagnostics remain ignored. The server's ignored live-app tests are exercised by its separate-process wrapper, except the older manual DAV review diagnostic; the new live runner supplies the requested 1,000 HTTP revocation checks. Existing demotion and scope expectations changed only because this issue explicitly requires old credentials to fail on the next request; this was disclosed in the earlier finding comment. The read-only reviewer found no remaining concrete critical or important finding after the fixes.
Integration: fetched origin/dev once and merged once; output was
Already up to date.No push, deploy or merge into dev/main. Module and changed function comments were read again. cargo clean removed 16,371 files / 8.5 GiB; web build output and Python caches were deleted. Working tree is clean.Gate output verbatim follows. All commands exited 0. Environment: CARGO_PROFILE_DEV_DEBUG=line-tables-only, CARGO_INCREMENTAL=0, CARGO_BUILD_JOBS=4, RUST_TEST_THREADS=4, TMPDIR=/target/tmp. CARGO_TARGET_DIR was not changed.
cargo fmt --check: no output; exit 0.
cargo clippy -p calternal-auth --all-targets -- -D warnings
cargo test -p calternal-auth
cargo clippy -p calternal-db --all-targets -- -D warnings
cargo test -p calternal-db
cargo clippy -p calternal-server --all-targets -- -D warnings
cargo test -p calternal-server
Additional #663 server audit evidence at
c4a61e8cfand round 7a2f4482ded: even after cached verify_app_password, session_context awaits record_app_password_use for DAV and App Password API/MCP calls. The method (auth/src/store.rs:1284at base, :1778 in 7a) UPDATEs last_used_at/protocol/IP through the single writer pool. Warm protected reads can therefore queue behind unrelated indexing/writes. Please retain this in #512/#587's scope: coalesce optional activity bookkeeping, keep current authority/revocation checks fail-closed through the reader pool, and prove warm reads complete while writer_pool is held. Do not speed this up by skipping current revocation checks. Source evidence only; no new latency measurement.