Glossary

This glossary defines the terms used across these docs. Where a term has both a generic identity-protocol meaning and a specific Olympus meaning, both are given.

A

AAL (Authenticator Assurance Level), A NIST 800-63B concept representing the strength of authentication. AAL1 is a single factor (password); AAL2 requires a second factor (TOTP, WebAuthn). Kratos surfaces the current session's AAL via session.authenticator_assurance_level.

ACR (Authentication Context Class Reference), An OIDC claim describing how a user was authenticated. Olympus emits acr values mirroring AAL.

Account linking, Associating multiple identity credentials (e.g. a password and a Google OIDC identity) with the same Kratos identity record. See Identity, Account Linking.

Admin API, The server-side privileged API surface of Kratos (:3101 / :4101) and Hydra (:3103 / :4103). Bound only to localhost in production; never exposed publicly.

Athena, The Olympus admin dashboard. One instance per CIAM/IAM domain. Next.js application. See Repo Map.

Audit log, The security_audit table in the olympus database. Recorded events: login success, login failure, lockout, lockout release, password change, settings change. See Security, Brute-Force Protection.

B

Breached password check, k-anonymity lookup against HaveIBeenPwned at registration and password change. See Security, Breached Password.

Brute-force protection, Per-identifier login-attempt rate limiting that escalates to an account lockout on repeated failures. Implemented in the SDK. See Security, Brute-Force.

C

Caddy, The reverse proxy that fronts Olympus. Terminates TLS, applies rate limits, sets security headers. See Security, Caddy Supply Chain.

Canvas, The Olympus design system. React + Tailwind components shared by Athena, Hera, and Site. Source-only npm package. See its standalone docs at olympusoss.github.io/canvas.

Captcha, Bot-mitigation challenge applied to registration, login, and recovery flows. Olympus uses Cloudflare Turnstile. Disabled by default in dev. See Security, Captcha Turnstile.

CIAM (Customer Identity and Access Management), The customer-facing half of Olympus. Ports 3xxx.

Client (OAuth2), An application registered in Hydra that can request tokens. Two kinds: public clients (SPAs, mobile apps; cannot keep a secret; must use PKCE) and confidential clients (server-side apps; have a client secret).

Client credentials grant, OAuth2 grant for server-to-server (M2M) calls where no human user is involved. See Integrate, Client Credentials.

Compose, Podman Compose, the orchestrator Olympus runs on. Equivalent to Docker Compose. See ADR 0010, Podman over Docker.

Consent challenge, The Hydra-issued ID for an in-progress OAuth2 consent decision. Hera looks up the challenge and shows (or auto-grants) consent.

Cookie secret, The HMAC key used by Hydra to sign session cookies. Rotatable. Listed in Operate, Secrets Audit.

Courier, Kratos's outbound message sender. Delivers verification emails, recovery codes, and notification emails. SMTP-based; can route to Resend, Postmark, Brevo, SMTP2GO, AWS SES, or any other SMTP relay.

Credential, A single authentication factor for an identity. Kratos stores credentials by type: password, oidc, totp, webauthn, lookup_secret, code.

CSP (Content Security Policy), HTTP header restricting what resources a page can load. Both Athena and Hera ship hardened CSPs. See Security, CSP Athena and Security, CSP Hera.

D

Daedalus, The Olympus production deployment wizard. Tauri desktop app. Embeds an MCP server so Claude can drive it. See Repo Map.

DBA account, A per-engineer database role mapped from an OIDC role claim. See Security, pgAdmin DBA Accounts.

DSN (Data Source Name), A connection string for a database. Kratos and Hydra both consume dsn: config fields.

Dual-domain architecture, The Olympus pattern of running CIAM and IAM as fully separate Kratos+Hydra stacks. See ADR 0001.

E

Encryption key, A 32-byte secret used by the SDK for AES-256-GCM encryption of sensitive settings values. Rotation procedure: see Operate, Encryption Key Rotation.

Encryption key blocklist, A list of known-weak / known-public values the SDK refuses to accept as ENCRYPTION_KEY. See Security, Encryption Key Blocklist.

F

Flow (Kratos), A self-service flow: login, registration, recovery, verification, settings, logout. Each is a state machine. Hera renders the current state; the user submits to advance.

Flow expiry, Each Kratos flow has a configured TTL (e.g. login flows expire after 1 hour). Expired flows must be re-initialized.

G

GHCR, GitHub Container Registry. Olympus images are pushed to ghcr.io/olympusoss/{athena,hera,site}.

H

Hera, The Olympus login/consent UI. One instance per domain. Next.js application. See Repo Map.

HKDF, HMAC-based Key Derivation Function. The SDK uses HKDF-SHA256 to derive per-record encryption keys from the master ENCRYPTION_KEY. See Security, Encryption at Rest.

Hydra, Ory Hydra, the OAuth2/OIDC server. One instance per CIAM/IAM domain.

I

IAM (Identity and Access Management), The employee-facing half of Olympus. Ports 4xxx.

Identifier, The field on an identity used to log in. Typically email, but the schema can declare any trait as an identifier. Kratos credentials store the resolved identifier under credentials.password.identifiers.

Identity, A Kratos record representing a user. Has a traits JSON object (matching the identity schema) and zero or more credentials.

Identity schema, A JSON Schema (draft-07) describing the shape of an identity's traits. Olympus ships six schemas: CIAM default, CIAM customer, CIAM company, IAM admin (each in dev and prod variants).

ID token, An OIDC token containing user claims. JWT-signed by Hydra. Returned alongside the access token in the OIDC flow.

Introspection, The OAuth2 endpoint (/oauth2/introspect) that resolves an opaque access token to its claims.

J

JWK / JWKS, JSON Web Key / JSON Web Key Set. Hydra publishes its signing keys at /.well-known/jwks.json.

JWT (JSON Web Token), A signed JSON token. Olympus uses JWTs for ID tokens; access tokens are opaque by default but can be configured as JWTs.

K

Kratos, Ory Kratos, the identity management service. Handles the self-service flows for registration, login, recovery, verification, and settings.

L

Lockout, A temporary or permanent block on a specific identifier's ability to log in, following repeated failed login attempts. Stored in the lockouts table. See Security, Account Lockout.

Login challenge, The Hydra-issued ID for an in-progress OAuth2 login. Hera looks it up to render the appropriate Kratos login flow.

Login flow, The Kratos self-service flow for authentication.

M

M2M (Machine-to-Machine), Server-to-server OAuth2, using the client_credentials grant. Olympus supports M2M against Hydra. See Integrate, Client Credentials.

MCP (Model Context Protocol), The Anthropic-defined protocol for exposing tools to LLMs. Daedalus embeds an MCP server on 127.0.0.1:14210. See Internals, Daedalus MCP Server.

MFA (Multi-Factor Authentication), Authentication requiring more than one factor. Olympus supports TOTP and WebAuthn as second factors. See Identity, MFA Policy.

N

Network topology, The set of host-bound vs intranet-only ports in the Compose stack. See Operate, Network Topology.

O

Octl, The Olympus local-development CLI. octl deploy brings up the dev stack; octl destroy tears it down.

OFCL (Olympus Free Container License), The license under which Olympus is distributed. See License.

OIDC (OpenID Connect), Identity layer on top of OAuth2. Provides the ID token and the userinfo endpoint.

Olympus, This project.

Opaque token, An access token that is not a JWT, just an unguessable string. Must be introspected to resolve claims. Hydra defaults to opaque access tokens.

P

Password hasher, The algorithm used to hash passwords at rest. Kratos defaults to Argon2id; bcrypt is supported for migrations.

PKCE (Proof Key for Code Exchange), RFC 7636 extension to OAuth2 Authorization Code that prevents authorization-code interception attacks. Mandatory for all public clients in Olympus. See Security, PKCE Enforcement.

Platform, The Olympus infrastructure repo. Compose configs, Ory configs, schemas, CI/CD.

Podman, A daemonless OCI container engine, the runtime Olympus uses instead of Docker. See ADR 0010.

Postgres / PostgreSQL, The database backing all of Olympus.

Public API, The browser-facing API surface of Kratos and Hydra (the :3100 / :3102 / :4100 / :4102 ports).

Public client, An OAuth2 client that cannot keep a secret (SPA, mobile). Required to use PKCE.

R

Recovery flow, The Kratos self-service flow for resetting a forgotten password.

Recovery HMAC token, The single-use, HMAC-signed code embedded in recovery emails. Deterministically invalidatable. See ADR 0017.

Reload API key, The shared secret between Kratos and its schema-reload sidecar that authorizes live schema reloads. See Operate, Reload API Key Rotation.

RP-initiated logout, The OIDC pattern where the relying party (the app) initiates the logout flow via /oauth2/sessions/logout.

S

Scope, An OAuth2 permission that an app requests during authorization. Hydra grants scopes through the consent flow.

SDK, The @olympusoss/sdk npm package. Settings vault, encryption, brute-force tracking, location tracking.

Session (Kratos), A logged-in browser session. Stored in the sessions table of Kratos's database. Has an AAL.

Session signing key, The HMAC-SHA256 key used by Athena to sign its session cookie. Separate from ENCRYPTION_KEY. See Operate, Session Signing Key Rotation.

Settings flow, The Kratos self-service flow for changing an identity's traits or credentials (e.g. changing email, changing password, enrolling TOTP).

Settings vault, The key-value store in the olympus database, scoped per-domain. Managed by the SDK. Athena's settings page is a UI over it.

Site, The brochure + OAuth2 playground + this docs site. Next.js + Fumadocs.

T

Token (OAuth2), A bearer credential issued by Hydra: access token (calls APIs), refresh token (gets new access tokens), ID token (identity assertion).

TOTP (Time-based One-Time Password), RFC 6238, used as a second factor in MFA. Olympus supports TOTP enrollment through the Kratos settings flow.

Trait, A field on an identity, defined by the identity schema. Examples: email, name.first, company.id.

Turnstile, Cloudflare's captcha product. Used by Olympus for bot mitigation.

V

Verification flow, The Kratos self-service flow for confirming control of an identifier (typically email).

verify-full, A PostgreSQL TLS mode that verifies both the certificate chain and the server hostname. Required in Olympus production. See Deploy, Database SSL verify-full.

W

WebAuthn, The W3C/FIDO standard for cryptographic authenticators (security keys, passkeys). Olympus supports WebAuthn as a second factor. See Identity, TOTP and WebAuthn.

Wizard (Daedalus), The thirteen-page sequence Daedalus walks an operator through: Repository → Domain → Provider → Email → Database → Compute → Secrets → OAuth → Deploy → Health → Accounts → Applications → Destroy.

Z

Zero-downtime rotation, A rotation procedure that keeps the system available throughout. The session signing key, encryption key, and reload API key all have zero-downtime rotation runbooks.