Saml2 auth - #76
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Implement LIneA federated login (SATOSA proxy -> CILogon and Rubin IdPs)
with djangosaml2, mirroring the working setup from lsp_daiquiri and target.
SAML cannot be tested locally, so everything is gated by the
AUTH_SAML2_ENABLED env var (default False): when disabled, nothing SAML
is loaded and login falls back to the existing admin/allauth flow.
- Add guarded SAML block to base settings: backend, middleware,
SAML_CONFIG (SP endpoints, signed requests/responses, remote SATOSA
metadata), attribute mapping, and login/register URLs per IdP
- Add LineaSaml2Backend (uid-based user lookup, needs_registration and
pending-status handling, group sync preserving INTERNAL_GROUPS)
- Add saml2_template_failure view routing ACS failures to registration,
waiting-approval, and login-error pages; use session.get("idp_name")
to avoid a KeyError present in the reference implementation
- Mount saml2/ URLs and the /login/ IdP chooser page only when enabled
- Restore first_name/last_name on the User model (migration 0002) so the
SAML attribute mapping matches the reference apps
- Add djangosaml2 error templates and Bootstrap 5 IdP chooser page
- Install xmlsec1 in local and production images; mount SP certificates
as a read-only volume in production; add cert generation README and
gitignore rules for key material
- Export SAML settings to templates via django-settings-export
- Add dedicated djangosaml2 rotating log file
- Add 26 tests covering the backend, failure view routing, and the
flag-off wiring (no SAML in settings, 404 routes, allauth intact)
- Document production env vars and deployment steps in README and
SAML2_IMPLEMENTATION.md
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