Implements AUDIT_REPORT.md H-3 (doc + retention), M-3, L-2/L-4 guidance:
- SECURITY.md: the deliberate data-at-rest posture (plaintext bodies + why, volume
encryption + backup guidance, DB TLS note, AllowedHosts note, production checklist,
delete-my-data procedure).
- Opt-in local data retention: DataRetention:{PurgeTrashedAfterDays,PurgeAllAfterDays}
(0 = disabled, no behaviour change) + daily RetentionWorker purging only the LOCAL
copy (Gmail untouched). 3 tests lock disabled-is-noop and purge-scoping.
- M-3: optional X.509 protection for the Data Protection key ring
(DataProtection:CertificatePath/Password) so keys are no longer necessarily
plaintext next to the ciphertext they protect.
Full suite: 51/51 green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Phase 5 re-validation caught a functional regression: the V-10 clamp in
SearchService.SearchAsync also capped CleanupService's internal target resolution
(pageSize 10000 -> 200), silently limiting bulk cleanup-by-query to 200 emails.
The clamp belongs at the user-facing trust boundary, not the shared service: move
MaxPageSize (200) enforcement into SearchController (both the POST body and GET query
paths). Internal callers of ISearchService now request large pages unhindered, while
user requests are still bounded. Adds a regression test proving SearchService returns
a 250-row page uncapped. No security regressions per Phase 5. All 39 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Defense-in-depth tenant isolation: every user-owned entity (Email, Sender,
MailThread, MailDomain, Attachment, Label, SyncState, AnalyticsAggregate,
WidgetLayout, UnsubscribeItem) gets a global query filter restricting reads to the
authenticated user. AppDbContext takes an optional ICurrentUser; CurrentUserId is
Guid.Empty for background workers / design-time, which DISABLES the filter so sync
and tooling (which already scope by an explicit userId) are unaffected. On the HTTP
attack surface a forgotten manual `WHERE UserId ==` can no longer leak another
tenant's rows.
Phase 1 confirmed no active IDOR; this is preventive, and prioritised now because the
upcoming automation engine will add many new queries.
Also: moved the Npgsql-only tsvector FTS mapping out of EmailConfiguration into
AppDbContext.OnModelCreating, guarded by Database.IsRelational() (Ignored otherwise),
so non-relational test providers work — honouring the existing Email.SearchVector
comment. Production (Npgsql) model is unchanged; no migration needed.
Adds 3 cross-user tenant-isolation integration tests. All 38 tests green.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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