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Add sync engine: cursors, push/pull, and the advisory-lock ordering proof (M1)

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The vault write path. Push is the only way items change — no per-entity POST/PUT/DELETE —
so one place enforces revisions, the change log and access control.

The concurrency hazard, now proven rather than asserted:
bigserial assigns sequence values when the INSERT runs, not at commit, so transaction A
can take sequence 5 while B takes 6 and commits first. A reader polling in between sees
only 6, advances past 5, and never learns about it. AdvisoryLockOrderingTests reproduces
that gap WITHOUT the lock first — otherwise the with-lock test proves nothing, since it
would pass just as happily if the interleaving never occurred — then shows
pg_advisory_xact_lock removes it, and that 12 concurrent writers produce no gaps.

Cursors are opaque and HMAC-tagged, and carry their vault id. 29 unit tests cover the
rejections, which are the point: an accepted-but-wrong cursor is silent data loss, strictly
worse than an error a client can resync from. Rejected: tampered tag, tampered payload,
foreign signing key, a legitimately-issued cursor from another vault, truncation, and
hostile input (never throws — cursors come from clients).

Push semantics:
- 200 even on partial failure, with per-operation status, so one stale item cannot block
  everything a client queued while offline.
- Conflict returns the server's current row for client-side three-way merge. The server
  cannot merge ciphertext, so never last-writer-wins.
- opId receipts make retries exactly-once per operation, not per batch — a client retrying
  a partially-overlapping batch after a timeout would otherwise double-apply what landed.
- A tombstone beats a late upsert, and delete clears hostname/port: leaving the address
  would keep the server able to resolve a host the user believes they deleted.
- Relay field validation mirrors the DB CHECK so a bad request is a clear Invalid rather
  than a constraint violation surfacing as a 500.

Authorization goes through IVaultAccessService, which returns the same answer for "absent"
and "forbidden" — distinguishing them is an existence oracle for other tenants' vault ids.
Team vaults are explicitly denied until M3 rather than falling through to a permissive
default. JIT provisioning keys on (issuer, subject), never email, and handles the
concurrent-first-request race via the unique index.

Renamed two domain types: Host -> SshHost, because Host collides with
Microsoft.Extensions.Hosting.Host in every file of a web project, and SyncChange ->
VaultChange to stop it colliding with the Contracts DTO of the same name. Aliasing at every
use site would have been permanent friction.

Worth noting: `ef migrations has-pending-model-changes` reported clean after those renames
even though the snapshot still said "DodoSSH.Domain.Host" — it diffs tables, not CLR type
names. The snapshot was regenerated and the emitted DDL diffed against the previous
artifacts/schema/v0.1.sql to confirm the rename produced no schema change.

Also removed ConfigureAwait(false) from test methods: xUnit1030 flags it as bypassing
parallelization limits, which is why MA0004 is suppressed in test projects.

Verified: 0 warnings on a clean rebuild, 146 tests pass (up from 122), format clean.

Endpoint-level tests are the immediate next step: they need a WireMock OIDC/JWKS stub and
real JWT minting, so the "wrong user is denied" matrix does not exist yet for these two
routes. The service-layer authorization and the concurrency property are covered.
This commit is contained in:
jaap-jan
2026-07-28 15:02:02 +02:00
parent d3b14e6bc0
commit 3829217e8a
23 changed files with 1931 additions and 290 deletions
Download Patch File Download Diff File Expand all files Collapse all files
artifacts/schema/v0.1.sql
+40 -40
View File
@@ -14,7 +14,7 @@ START TRANSACTION;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM pg_namespace WHERE nspname = 'dodo') THEN
CREATE SCHEMA dodo;
END IF;
@@ -23,7 +23,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM pg_namespace WHERE nspname = 'dodo') THEN
CREATE SCHEMA dodo;
END IF;
@@ -32,14 +32,14 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE EXTENSION IF NOT EXISTS citext;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.key_log (
sequence bigint GENERATED ALWAYS AS IDENTITY,
user_id uuid NOT NULL,
@@ -57,7 +57,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.sync_change (
sequence bigint GENERATED ALWAYS AS IDENTITY,
vault_id uuid NOT NULL,
@@ -74,7 +74,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.sync_operation_receipt (
operation_id uuid NOT NULL,
vault_id uuid NOT NULL,
@@ -88,7 +88,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.team (
id uuid NOT NULL,
name character varying(256) NOT NULL,
@@ -104,7 +104,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.user_account (
id uuid NOT NULL,
issuer character varying(512) NOT NULL,
@@ -124,7 +124,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.device (
id uuid NOT NULL,
user_id uuid NOT NULL,
@@ -142,7 +142,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.team_membership (
id uuid NOT NULL,
team_id uuid NOT NULL,
@@ -162,7 +162,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.user_key (
id uuid NOT NULL,
user_id uuid NOT NULL,
@@ -184,7 +184,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.vault (
id uuid NOT NULL,
name character varying(256) NOT NULL,
@@ -209,7 +209,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.user_key_wrap (
id uuid NOT NULL,
user_id uuid NOT NULL,
@@ -238,7 +238,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.host (
id uuid NOT NULL,
vault_id uuid NOT NULL,
@@ -270,7 +270,7 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE TABLE dodo.vault_key_grant (
id uuid NOT NULL,
vault_id uuid NOT NULL,
@@ -296,170 +296,170 @@ END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_device_user_id ON dodo.device (user_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_host_vault_id_change_sequence ON dodo.host (vault_id, change_sequence);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_host_vault_live ON dodo.host (vault_id) WHERE deleted_at_utc IS NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_key_log_hash ON dodo.key_log (hash);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_key_log_user_id ON dodo.key_log (user_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_sync_change_vault_id_entity_id_sequence ON dodo.sync_change (vault_id, entity_id, sequence DESC);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_sync_change_vault_id_sequence ON dodo.sync_change (vault_id, sequence);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_sync_operation_receipt_vault_id_created_at_utc ON dodo.sync_operation_receipt (vault_id, created_at_utc);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_team_slug ON dodo.team (slug) WHERE deleted_at_utc IS NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_team_membership_team_id_user_id ON dodo.team_membership (team_id, user_id) WHERE deleted_at_utc IS NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_team_membership_user_id ON dodo.team_membership (user_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_account_email ON dodo.user_account (email) WHERE email IS NOT NULL AND deleted_at_utc IS NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_account_issuer_subject ON dodo.user_account (issuer, subject);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_key_current ON dodo.user_key (user_id) WHERE is_current;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_key_fingerprint_sha256 ON dodo.user_key (fingerprint_sha256);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_key_user_id_generation ON dodo.user_key (user_id, generation);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_user_key_wrap_device_id ON dodo.user_key_wrap (device_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_key_wrap_user_device ON dodo.user_key_wrap (user_id, device_id) WHERE device_id IS NOT NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_user_key_wrap_user_kind ON dodo.user_key_wrap (user_id, kind) WHERE device_id IS NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_vault_owner_user_id ON dodo.vault (owner_user_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_vault_team_id ON dodo.vault (team_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE INDEX ix_vault_key_grant_recipient_user_id ON dodo.vault_key_grant (recipient_user_id);
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
CREATE UNIQUE INDEX ix_vault_key_grant_vault_id_key_generation_recipient_user_id ON dodo.vault_key_grant (vault_id, key_generation, recipient_user_id) WHERE revoked_at_utc IS NULL AND recipient_user_id IS NOT NULL;
END IF;
END $EF$;
DO $EF$
BEGIN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728113419_InitialSchema') THEN
IF NOT EXISTS(SELECT 1 FROM dodo."__EFMigrationsHistory" WHERE "migration_id" = '20260728125751_InitialSchema') THEN
INSERT INTO dodo."__EFMigrationsHistory" (migration_id, product_version)
VALUES ('20260728113419_InitialSchema', '10.0.10');
VALUES ('20260728125751_InitialSchema', '10.0.10');
END IF;
END $EF$;
COMMIT;