dorfteich/docs/architecture/adr
Claude Fable 5 4c7f001cab
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#215: trusted reverse-proxy header / mTLS client-certificate path
For perimeters that authenticate before the application (ADR 0021 §4).
Off unless BOTH AUTH_PROXY_HEADER and AUTH_PROXY_TRUSTED_PEERS are set —
nothing about the header is guessed. The peer check runs against the TCP
peer address only (a forwarded header is attacker-influenced): a request
carrying the header from any other peer is rejected outright and audited
as auth.proxy_rejected (catalogue v1.4) — that is a spoof attempt, not a
misconfiguration — even when a valid session cookie rides along. From a
trusted peer the header IS the identity; a session cookie never
escalates beyond it; with the feature off the header is inert.

Mapping is explicit (AUTH_PROXY_MAP: username or e-mail); deliberately
no just-in-time creation — the header carries no verified address. The
mTLS variant (AUTH_PROXY_MODE=mtls-dn) maps the configured attribute
(default CN) out of the certificate subject DN the TLS terminator
forwards, under the same peer rules. Session-less proxy requests key the
read trail per user (user:<id>).

The trust boundary is stated in security.md (the section an assessor
reads closest), the VS-NfD security documentation and the hardening
guide's deploy table. Tests cover all four decisions: off = inert,
trusted peer authenticates (username and DN mapping), untrusted peer
rejected + audited, no escalation past a session cookie.

Refs #215.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AUtYMxwTCMHG9mVHnwbFg8
2026-07-31 12:50:09 +02:00
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0001-typescript-monorepo.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0002-postgresql.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0003-yjs-crdt-collaboration.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0004-tiptap-editor.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0005-react-vite-frontend.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0006-nestjs-prisma-backend.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0007-auth-sessions-oidc-ready.md #190: configurable session lifetime with a server-side idle timeout 2026-07-30 11:11:15 +02:00
0008-plugin-sandbox.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0009-import-export-converters.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0010-postgres-fulltext-search.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0011-file-storage-quotas.md Scaffold pnpm monorepo with lint, format, and test tooling 2026-07-04 19:06:27 +02:00
0012-i18n.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0013-versioning-and-trash.md Scaffold pnpm monorepo with lint, format, and test tooling 2026-07-04 19:06:27 +02:00
0014-gitea-actions-cicd.md Move the stage directories to /srv/DOCKER (host consolidation) 2026-07-14 12:43:29 +02:00
0015-backup-strategy.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0016-self-hosted-fonts.md Add architecture documentation, ADRs, and operations concept 2026-07-04 14:36:16 +02:00
0017-accessibility-by-default.md docs: ADR 0017 — Barrierefreiheit als Standard-Anforderung 2026-07-21 17:17:26 +02:00
0018-color-theming.md #186: pond accent theming — scoped derivation, cascade pond > user > default 2026-07-29 09:09:36 +02:00
0019-no-security-base-functions.md docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts) 2026-07-30 01:48:05 +02:00
0020-token-crypto-key-separation.md docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts) 2026-07-30 01:48:05 +02:00
0021-external-authentication.md #215: trusted reverse-proxy header / mTLS client-certificate path 2026-07-31 12:50:09 +02:00
0022-page-classification.md #212: mark attachment downloads by filename prefix and companion file 2026-07-31 07:29:16 +02:00
0023-read-access-audit-trail.md #225: read-trail master switch and written purpose limitation 2026-07-31 12:35:18 +02:00
0024-reproducible-offline-deployment.md docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts) 2026-07-30 01:48:05 +02:00
0025-plugin-trust-model.md docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts) 2026-07-30 01:48:05 +02:00
0026-backup-target-restriction.md docs: VS-NfD readiness planning (ist-aufnahme, plan, ADRs 0019-0026, issue drafts) 2026-07-30 01:48:05 +02:00