epok-auth

FastAPI-first authentication with PostgreSQL-authoritative, revocable sessions.

epok-auth is designed for private B2B web applications that need secure local accounts without rebuilding password handling, session rotation, revocation, CSRF protection, administration, and FastAPI dependencies for every product.

Version 0.4.0 also includes browser-bound Magic Links, password recovery, pre-provisioned invitations and native SMTP delivery. See docs/MAGIC_LINKS_ES.md.

Status: 0.4.0 is the current beta with WebAuthn passkeys, Google Sign-In, Magic Links and isolated Alembic history for host application compatibility. Public APIs may still change before 1.0.

Practical testing: see the Spanish step-by-step guide in docs/USAGE_ES.md.

Validated beta gate

The clean beta tree is continuously validated by GitHub Actions. The current release has passed:

The repository does not claim that vulnerabilities are impossible. The green gate establishes reproducible evidence for the defined beta threat model and invariants.

What 0.4.0 includes

• Argon2id password hashing through pwdlib, with rehash support and dummy verification;
• local users, active/disabled state, roles, scopes, administrative provisioning and reset;
• short-lived access JWTs with strict issuer, audience, algorithm, type and time validation;
• opaque refresh credentials stored only as SHA-256 hashes;
• refresh rotation, session families and reuse detection;
• immediate access revocation through authoritative PostgreSQL session state;
• inactivity and absolute session deadlines;
• secure cookies, CSRF correlation and strict Origin allowlists;
• account lockout, uniform login failures and security-event persistence;
• plug-and-play FastAPI routers and dependencies;
• WebAuthn passkey registration, discoverable login, listing and revocation;
• Google Sign-In with linked-only, preauthorized and open account policies;
• browser-bound Magic Link login, password recovery, pre-provisioned invitations and SMTP delivery;
• packaged Alembic migrations and an operational CLI;
• a Nuxt/Nitro BFF reference where Vue never receives access or refresh tokens.

Generic OIDC providers, TOTP/MFA, Redis coordination, multi-tenancy and service-to-service authentication remain outside this beta. See ROADMAP.md.

Installation

Google Sign-In on an existing adapter:

uv add "epok-auth[google]"

Complete production stack:

uv add "epok-auth[google,postgres,passkeys]"

Generate a secret and configure the application:

uv run epok-auth generate-secret

EPOK_AUTH_ENVIRONMENT=production
EPOK_AUTH_DATABASE_URL=postgresql://colors:password@postgres/colors
EPOK_AUTH_JWT_SECRET=<generated-secret>
EPOK_AUTH_ISSUER=colors-auth
EPOK_AUTH_AUDIENCE=colors-api
EPOK_AUTH_TRUSTED_ORIGINS=https://colors.example.com
EPOK_AUTH_PASSKEY_RP_ID=example.com
EPOK_AUTH_PASSKEY_RP_NAME=Colors
EPOK_AUTH_GOOGLE_CLIENT_ID=123456789-example.apps.googleusercontent.com
EPOK_AUTH_GOOGLE_ACCOUNT_MODE=linked_only
EPOK_AUTH_EMAIL_LINK_LOGIN_URL=https://colors.example.com/auth/email-link
EPOK_AUTH_EMAIL_LINK_PASSWORD_RESET_URL=https://colors.example.com/auth/reset-password
EPOK_AUTH_EMAIL_LINK_INVITATION_URL=https://colors.example.com/auth/invitation

Production configuration is fail-closed: weak secrets, insecure cookies, generic issuer/audience values, missing PostgreSQL, and ambiguous origins prevent startup.

Publication

The version has one source of truth in pyproject.toml and is exposed at runtime through importlib.metadata:

uv version --short
uv version --bump beta
uv version --bump stable
uv version --bump patch

uv version --short prints the current project version, not the installed version of uv.

Local PyPI credentials belong in an ignored .env.secret file. The complete release pipeline is a single Python command:

cp .env.secret.example .env.secret
uv run scripts/publish.py --validate-only
uv run scripts/publish.py --dry-run
uv run scripts/publish.py

The normal command validates Python 3.12 through 3.14, launches disposable PostgreSQL 17, runs migrations, drift checks, integration, concurrency and coverage, builds and installs wheel/sdist, simulates the upload, publishes after an exact-version confirmation, pushes the tag and verifies the public PyPI installation.

The script uses inline PEP 723 dependencies and uv run --isolated, so it does not replace the developer's project .venv. The legacy bash scripts/publish.sh command remains as a thin alias. See docs/PUBLISHING.md for the complete procedure.

Database and initial administrator

uv run epok-auth check-config
uv run epok-auth upgrade-db
uv run epok-auth check-db
uv run epok-auth create-admin

The first administrator is serialized transactionally. A second initial-admin creation attempt fails rather than racing.

FastAPI integration

from fastapi import Depends, FastAPI

from epok_auth import EpokAuth, Principal, load_auth_settings

settings = load_auth_settings()
auth = EpokAuth.postgres(
    settings=settings,
    email_link_dispatcher=durable_email_queue,
)

app = FastAPI(lifespan=auth.lifespan)
auth.install(
    app,
    prefix="/api/v1/auth",
    include_admin=True,
    include_passkeys=True,
    include_google=True,
    include_email_links=True,
)

catalog = auth.protected_router(prefix="/api/v1/catalog")


@catalog.get("")
async def get_catalog(
    principal: Principal = Depends(auth.authenticated),
) -> dict[str, str]:
    return {"viewer": principal.email}


@catalog.post("")
async def update_catalog(
    principal: Principal = Depends(auth.require_scopes("catalog:write")),
) -> dict[str, str]:
    return {"editor": principal.email}


app.include_router(catalog)

durable_email_queue is the product-owned implementation of EmailLinkDispatcher. The complete worker contract is documented in MAGIC_LINKS_ES.md.

auth.install() exposes:

POST /api/v1/auth/login
POST /api/v1/auth/refresh
POST /api/v1/auth/logout
POST /api/v1/auth/change-password
GET  /api/v1/auth/me
POST /api/v1/auth/passkeys/registration/options
POST /api/v1/auth/passkeys/registration/verify
POST /api/v1/auth/passkeys/authentication/options
POST /api/v1/auth/passkeys/authentication/verify
GET  /api/v1/auth/passkeys
DELETE /api/v1/auth/passkeys/{passkey_id}
POST /api/v1/auth/google/options
POST /api/v1/auth/google/verify
POST /api/v1/auth/google/link/options
POST /api/v1/auth/google/link/verify
POST /api/v1/auth/users/{user_id}/google/recover
POST /api/v1/auth/email-links/login
POST /api/v1/auth/email-links/login/consume
POST /api/v1/auth/email-links/password-reset
POST /api/v1/auth/email-links/password-reset/consume
POST /api/v1/auth/email-links/invitation/consume
POST /api/v1/auth/users/{user_id}/invitation

The recovery route and the rest of user administration appear only with include_admin=True.

Application boundary

epok-auth owns authentication capabilities:

• credentials and account state;
• sessions, rotation and revocation;
• generic roles/scopes;
• browser transport protections;
• authentication audit events.

The consuming product still owns:

• tenants and memberships;
• domain permissions;
• resource-level authorization;
• business profiles and data;
• frontend UI and infrastructure.

A role named editor has no meaning until Colors decides what an editor can do.

Nuxt BFF

The BFF is not implemented inside the Python library. The repository includes a reference integration under examples/nuxt-bff that demonstrates this boundary:

Browser ── HttpOnly opaque session cookie ──> Nuxt/Nitro
Nuxt/Nitro ── protected access/refresh ──> FastAPI + epok-auth

Vue receives only safe user/session state. Access and refresh credentials remain server-side.

Documentation

• Development process and quality gates
• Minimal usage and test guide in Spanish
• Passkeys integration guide in Spanish
• Google Sign-In integration guide in Spanish
• Magic Links, recovery and email delivery in Spanish
• Publishing and versioning
• Threat model
• Security assurance
• Security policy

Security model

The beta is designed around these invariants:

• knowledge of the source code does not grant access;
• PostgreSQL is the authority for session validity;
• refresh credentials are one-time, opaque and hashed at rest;
• replay revokes the whole session family;
• changing a password, disabling or locking a user revokes sessions;
• unsafe production configuration fails before serving traffic;
• authentication errors do not echo secrets or distinguish unknown users.

Development

uv sync --locked --all-extras --group dev
uv run ruff format --check .
uv run ruff check .
uv run pyright
uv run pytest

Pull requests must pass the GitHub Actions CI / merge-gate, including PostgreSQL 17, Python 3.12 through 3.14, branch coverage, dependency auditing, packaging and isolated installation. CodeQL must also pass.