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# Visione CIE OIDC RP Technical Plan
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## Goal
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Implement Visione backend as SPID/CIE OIDC Federation Relying Party compatible
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with local demo provider contained in `spid-cie-oidc-django/examples/provider`.
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Scope target for first real implementation:
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- compatibility with demo provider only
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- CIE profile only
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- Visione backend remains source of truth for application auth
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- frontend drives browser redirect flow
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## Local Reference Mapping
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- Demo OP/federation behavior source:
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- `spid-cie-oidc-django/examples/provider`
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- `spid-cie-oidc-django/spid_cie_oidc/provider`
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- `spid-cie-oidc-django/spid_cie_oidc/entity`
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- Demo RP behavior to emulate in Drogon:
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- `spid-cie-oidc-django/spid_cie_oidc/relying_party/views/rp_begin.py`
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- `spid-cie-oidc-django/spid_cie_oidc/relying_party/views/rp_callback.py`
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## Current Status
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- `common/OidcJwt.*` now owns JWT/JWS/JWK work through `jwt-cpp`
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- `common/OidcCrypto.*` isolates OpenSSL-only JWE compact parsing and decrypt
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- `POST /api/v1/auth/cie/start` signs the request object with RP signing key
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- callback exchanges code with `private_key_jwt`, verifies token JWS and `at_hash`
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- `userinfo` GET supports plain JSON and demo-compatible nested JWE -> JWS
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- merged OIDC claims persist through `user_external_identities`
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- frontend polling contract is active through `GET /api/v1/auth/cie/session/{state}`
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## Foundation Added In This Step
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- config placeholders in `config.json`
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- DB schema for OIDC auth sessions, tokens, federation cache, external identities
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- Drogon controller skeleton in `controllers/OidcController.*`
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- service skeleton in `services/OidcRpService.*`
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- RP config helper in `common/OidcRpConfig.*`
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- RP public endpoints reserved:
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- `POST /api/v1/auth/cie/start`
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- `GET /api/v1/auth/cie/callback`
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- `GET /api/v1/auth/cie/session/{state}`
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- `GET /oidc/rp/.well-known/openid-federation`
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- `GET /oidc/rp/resolve`
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- `GET /oidc/rp/jwks.json`
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## Residual Backlog
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### Phase 1: Dependencies and crypto plumbing
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- Done for demo scope:
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- `jwt-cpp` handles JWT parsing, signing and signature verification
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- custom OpenSSL code remains only for JWE decryption in `OidcCrypto`
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- focused unit tests cover JWT helpers and both supported JWE CBC/HMAC modes
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### Phase 2: RP metadata and JWKS
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- Done for demo flow.
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- Residual gap:
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- verify metadata fields against non-demo providers before reuse
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### Phase 3: Federation trust resolution
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- Current cut:
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- fetches trust-anchor `resolve`
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- extracts OP metadata/JWKS/endpoints
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- Not done:
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- full trust-chain signature validation
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- federation cache population/reuse
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- multi-provider or multi-anchor logic
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### Phase 4: Authorization start
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- Done.
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- Demo scope now sent explicitly as `openid cie_demo`.
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### Phase 5: Callback and token exchange
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- Done for demo provider.
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- Residual gap:
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- explicit `exp` / `iat` skew checks still thin
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- no refresh-token lifecycle use yet
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### Phase 6: UserInfo and local account link
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- Done for demo provider, including JWE decrypt + JWS verify + merged claims.
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### Phase 7: Frontend completion contract
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- Done.
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- Session payload now exposes:
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- public `status`
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- internal `phase`
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- `auth` payload only on success
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### Phase 8: Tests and docs
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- Unit tests added for:
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- JWT parse/sign/verify
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- `kid` lookup
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- `at_hash` helper
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- JWE decrypt for `A256CBC-HS512`
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- JWE decrypt for `A128CBC-HS256`
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- invalid JWE tag / unsupported enc
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- merged claim precedence and fiscal code normalization
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- Still missing:
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- automated integration tests against live demo Django OP
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## Data Model Notes
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### `oidc_authentications`
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Stores single login transaction state and provider snapshot.
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### `oidc_authentication_tokens`
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Stores authorization code and received tokens.
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### `oidc_federation_cache`
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Stores fetched federation docs with expiry.
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### `user_external_identities`
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Decouples local user from external subject identifiers.
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## Current Decisions
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- Keep OTP auth alive in parallel
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- Use local `api_tokens` after OIDC success
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- Use `fiscal_code` as strongest user reunification key
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- Do not expose Visione token in query string
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- Prefer external validated libs over handwritten JWT/JWK code
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## Ready Criteria For Real Implementation
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- foundation schema merged
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- config keys finalized
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- dependency choice finalized
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- endpoint shapes stable enough for frontend
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When these are acceptable, next step is real implementation of Phase 1-4.
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## Demo CIE Runbook
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### Prerequisites
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- MySQL and Mailpit running locally through this repo `docker compose`
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- RP keys available in `secrets/oidc/demo-rp-jwks.json`
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- backend `config.json` aligned with:
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- trust anchor `http://127.0.0.1:8000`
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- provider issuer `http://127.0.0.1:8002/oidc/op`
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- callback `http://127.0.0.1:5555/api/v1/auth/cie/callback`
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### Bootstrap local dependencies
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```bash
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docker compose up -d
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cmake -S . -B build_local -G Ninja -DCMAKE_BUILD_TYPE=Debug
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cmake --build build_local
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```
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### Bootstrap demo federation authority
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```bash
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cd spid-cie-oidc-django/examples/federation_authority
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cp federation_authority/settingslocal.py.example federation_authority/settingslocal.py
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python3 -m pip install --upgrade pip
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python3 -m pip install -e ../..
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python3 -m pip install "design-django-theme==v1.4.8"
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./manage.py migrate
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./manage.py loaddata dumps/example.json
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./manage.py runserver 0.0.0.0:8000
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```
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### Bootstrap demo provider
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```bash
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cd spid-cie-oidc-django/examples/provider
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cp provider/settingslocal.py.example provider/settingslocal.py
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./manage.py migrate
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./manage.py loaddata dumps/example.json
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./manage.py runserver 0.0.0.0:8002
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```
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### Start Visione backend
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```bash
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./build_local/visione-backend
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```
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### Start login
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```bash
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curl -sS -X POST http://127.0.0.1:5555/api/v1/auth/cie/start \
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-H 'Content-Type: application/json' \
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-d '{"provider":"cie_demo","frontend_redirect_uri":"http://localhost:3000/auth/cie/callback"}'
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```
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Expected result:
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- `authorization_url` present
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- `state` present
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- one row in `oidc_authentications` with phase `AUTHORIZATION_REDIRECT_READY`
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### Complete browser flow
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1. Open returned `authorization_url`.
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2. Authenticate with the demo CIE user configured by the Django fixtures.
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3. Accept consent if requested.
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4. Provider redirects to backend callback.
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5. Backend redirects frontend to `frontend_redirect_uri?state=...`.
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### Poll login result
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```bash
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curl -sS http://127.0.0.1:5555/api/v1/auth/cie/session/<state>
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```
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Expected success payload:
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- `status = "authenticated"`
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- `phase = "AUTHENTICATED"`
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- `auth.token` present
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### Minimal DB verification
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```sql
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SELECT state,status,authenticated_user_id FROM oidc_authentications ORDER BY id DESC LIMIT 3;
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SELECT authentication_id,token_type,scope FROM oidc_authentication_tokens ORDER BY id DESC LIMIT 3;
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SELECT user_id,provider,issuer,subject,fiscal_code FROM user_external_identities ORDER BY id DESC LIMIT 3;
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SELECT user_id,expires_at FROM api_tokens ORDER BY id DESC LIMIT 3;
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```
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### Common failures
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- `provider_metadata_missing`: federation authority not started or wrong trust anchor URL
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- `token_exchange_failed`: provider callback reached but token endpoint unavailable or RP assertion invalid
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- `invalid_userinfo_response`: JWE decryption key mismatch or unexpected provider response format
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- `at_hash_mismatch`: provider tokens not aligned with received `access_token`
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gabdevele