# Sign-in and accounts Choose who can create an account and how people sign in: allowlists, email verification, SSO, passkeys and password rules. ## Who can sign up ```env SIGNUPS_ENABLED=true SIGNUP_ALLOWLIST=you@example.com,@company.com ``` `SIGNUPS_ENABLED` and `SIGNUP_ALLOWLIST` come from the operator's environment on every start. An empty allowlist clears any old stored list; signup order never grants privileges. Server configuration belongs in the operator's environment. App accounts cannot change signup policy, server integration credentials, or deployment updates, and cannot read deployment security logs. There is no app-admin role, first-user privilege, or `ADMINS` list. Workspace owners manage only their own workspace. `PREA_ADMIN_EMAILS` names accounts, comma-separated, that review plugin submissions and add stdio MCP servers ([integrations](/docs/self-host-integrations/)). An account counts only once its email is verified. It grants nothing else. ## Email verification and sign-in codes With a nonempty signup allowlist and SMTP configured, users—including existing accounts—must verify their email to sign in. Without an allowlist, verification never blocks: a password signup signs in at once and is sent a verification link that only marks the address verified. SMTP also enables sign-in with a six-digit emailed code, which expires after ten minutes and allows three attempts. A code can create an account, so it follows the same registration and allowlist rules as password signup. Signing in with a code to an existing unverified account removes that account's password, SSO links and sessions, since nothing proved they belonged to the mailbox owner. This is what stops someone who registered another person's address from keeping access. Allowlisted signup requires mailbox verification and email delivery, including the first account. Without email delivery, use the server-side account bootstrap described below; public signup never marks an address verified or assigns server permissions. ## Installations without email For an installation without email, first set `SIGNUPS_ENABLED=false` in `.env` and start the stack. Create the intended account privately (the password stays in the shell environment): ```bash read -r -p "Account email: " OWNER_EMAIL read -r -s -p "Account password (at least 16 characters): " OWNER_PASSWORD export OWNER_EMAIL OWNER_PASSWORD docker compose --env-file .env -f docker-compose.images.yml exec -e OWNER_EMAIL -e OWNER_PASSWORD api node dist/cli/bootstrap-owner.js unset OWNER_EMAIL OWNER_PASSWORD ``` For a source checkout, use `-f infra/compose/docker-compose.yml` instead. This creates an ordinary verified account and a personal workspace, with no server privileges. For an existing unverified account, its password must match before it can be verified; an existing verified account is left unchanged. Keep an installation without email on a trusted local network. ## Verification and password recovery email Password changes for signed-in users require no email configuration. Forgotten-password recovery appears on sign-in only when a transactional email provider is available. Preá uses a provider-neutral contract with Resend API and SMTP adapters. Templates render locally with React Email into HTML and plain text, independent of the sending provider. To use the Resend HTTP API, verify a sending domain and create a sending-only API key restricted to that domain, then configure: ```env EMAIL_PROVIDER=resend EMAIL_API_KEY=replace-with-sending-api-key EMAIL_FROM=Preá ``` Disable click and open tracking for account email in the provider's domain settings. Resend delivery has a ten-second deadline and bounded retries with the same idempotency key, including when a response is lost. Errors omit provider response bodies and credentials. For Amazon SES or another SMTP server, use: ```env SMTP_URL=smtps://smtp-user:replace-with-password@smtp.example.com:465 EMAIL_FROM=Preá ``` Set `EMAIL_REPLY_TO` to send replies somewhere other than `EMAIL_FROM`. `EMAIL_PROVIDER=smtp` is optional: an existing `SMTP_URL` continues to select SMTP when no provider is specified. `EMAIL_PROVIDER=none` disables external sending. Explicit provider settings take precedence over an old `SMTP_URL`; incomplete or unknown provider configurations fail at startup. Resend also supports SMTP: use `smtp.resend.com`, username `resend`, and an API key as the password. For Amazon SES, use the regional SMTP endpoint and SES SMTP credentials; these are different from ordinary AWS access keys. Verify the sender/domain with the provider before testing delivery. Keep credentials in `.env`, never in tracked files. `smtps://` uses implicit TLS; `smtp://` is also supported but requires STARTTLS. Preá rejects configuration that disables TLS or certificate verification. Local source development can use the offline email emulator instead. It captures email without contacting a provider: ```env EMAIL_EMULATOR=true ``` The emulator is forcibly disabled when `NODE_ENV=production` and requires the API to bind to a loopback host. In `NODE_ENV=development`, captured messages are available from `http://127.0.0.1:3100/api/dev/emails` with cache disabled; the API logs only delivery metadata, never reset tokens. The inbox route is not registered in test, staging, or production. Set `WELCOME_EMAIL_ENABLED=true` to send each new account one welcome email, with an unsubscribe link, after it first signs in. It needs one of the providers above. ## Password policy New passwords (signup, reset and change) must be 8 to 128 characters, with no composition rules. Optionally reject new passwords that appear in known breaches: ```env AUTH_BREACHED_PASSWORD_CHECK_ENABLED=true ``` This queries the Have I Been Pwned range API, sending only the first five characters of the password's SHA-1 hash. It is off by default so the server makes no outside request. If the service is unreachable or takes longer than three seconds, the password is accepted and the failure logged. ## OpenID Connect SSO SSO works with a self-hosted or hosted OpenID Connect provider. Leave its settings unset to keep password authentication alone. Configure all three credentials together on the API: ```env OIDC_ISSUER=https://identity.example.com OIDC_CLIENT_ID=replace-with-client-id OIDC_CLIENT_SECRET=replace-with-client-secret OIDC_NAME=SSO OIDC_SCOPES=openid email profile AUTH_PASSWORD_ENABLED=true OIDC_ALLOW_SIGNUP_BYPASS=false ``` The issuer must be HTTPS and exactly match the discovery document's issuer. Preá loads `/.well-known/openid-configuration`, verifies ID tokens against discovery JWKS with issuer, audience and nonce checks, and uses authorization codes with PKCE. Additional scopes may be space- or comma-separated; `openid email profile` are always requested. `OIDC_NAME` is the button label, defaulting to “SSO”. Secrets remain on the API; Compose clears the worker's OIDC credentials. The capabilities endpoint exposes only the label, discovery availability, and enabled authentication methods. Register this redirect URI at the provider (using your public `BETTER_AUTH_URL` origin): ```text https://app.example.com/api/auth/callback/oidc ``` Web, Electron and mobile use the same provider redirect URI. Electron completes SSO in a sandboxed in-app popup sharing the app's session, then returns to the main window. Mobile completes the callback on the API, then returns to `prea://sign-in` (or `prea://account` for linking and reauthentication) through Better Auth's Expo authorization proxy and a native auth browser session. The `prea` app scheme is trusted by the auth server; never register a client secret in the mobile app. Mobile stores the resulting session with SecureStore, like password sign-in. Native builds need the Expo WebBrowser module. Provider emails are verified only when `email_verified` is the boolean `true`. False or missing claims stay unverified, including on subsequent sign-ins. Sign-in never links accounts by email. If an email belongs to another account, sign in to that existing account and choose **Link SSO** in account settings. Linking requires an authenticated session, a verified provider email and matching email addresses. The issuer and provider subject identify the linked account thereafter. Changing issuers does not reuse an old identity. Old-issuer links remain stored but do not count as linked to the current provider, so **Link SSO** becomes available again. Link the new identity from the existing signed-in account; authenticated-session, verified-email and matching-email checks still apply. Restoring the old issuer makes its existing links usable again. Ordinary SSO sign-in and linking may reuse the identity provider's existing session. They do not grant fresh authentication proof for account deletion. The account settings' explicit reauthentication flow requests `prompt=login` and `max_age=0`, binds the callback to the same linked issuer and subject, and requires the initiating session to remain valid. Only that callback grants proof to the resulting session, expiring five minutes after provider authentication (callback delays do not extend it). Its verified ID token must contain an `auth_time` consistent with that request (allowing 60 seconds of clock skew) and less than five minutes old. Missing, stale or invalid claims fail closed. OAuth callbacks are single-use, including concurrent requests. Password verification and emailed deletion codes remain available. Submit deletion codes through the account settings or the CSRF-protected `POST /api/auth/delete-user` endpoint; the GET deletion callback is disabled. SSO signup follows closed registration and the deployment allowlist before creating an account. Allowlisted provider emails must be verified; signup never bypasses mailbox proof. `OIDC_ALLOW_SIGNUP_BYPASS=true` explicitly admits IdP identities without applying the allowlist or its email-verification admission requirement. Enable it only when the IdP controls who may join this deployment. It does **not** reopen closed registration, and does not change email verification claims or linking rules. Existing admitted accounts can sign in while registration is closed. Set `AUTH_PASSWORD_ENABLED=false` for SSO-only operation. Password sign-in, signup, password reset and password mutation endpoints are disabled server-side, and sign-in forms are hidden. The API refuses to start in this mode unless all OIDC credentials are configured. It can still start while discovery is temporarily unavailable: the provider remains registered, sign-in returns a temporary error, and background retries recover without restarting. Discovery is lazy on first use, refreshed in the background, and failures back off up to one minute. Availability reflects discovery, not a guarantee that the provider's token endpoint is currently reachable. Account deletion keeps the existing password confirmation for password users. Users without a password may delete after explicit provider reauthentication within five minutes; **Sign in again** starts a fresh provider round-trip bound to the signed-in account. Choosing a different identity cannot confirm deletion or create another account in that flow. A stale or borrowed session alone cannot authorize deletion. With transactional email configured, **Send deletion code** sends a single-use code to the account email, valid for ten minutes. Enter it in account settings to confirm deletion. Email-code requests are rate-limited; invalid, expired or wrong-account codes fail. No password needs to be created for deletion. ## Passkeys Passkeys are on whenever `WEB_ORIGIN` is an HTTPS domain (or `localhost` in development); the relying party is that origin's host, so existing passkeys keep working only while `WEB_ORIGIN` stays on the same domain. They are off when password sign-in is disabled for SSO-only deployments. On web, a browser offers them where it has a platform authenticator. The macOS desktop app uses the system passkey sheet, which only serves the domain the release is associated with (`app.prea.ia.br`), so it hides passkeys for other servers. Native apps can use a domain's passkeys only when the domain vouches for them and the app was built for that domain (the app's associated domain comes from `EXPO_PUBLIC_API_URL` at build time). To let a build use this server's passkeys, set: ```bash # iOS and the macOS desktop app (tech.orbin.prea.desktop): ., comma-separated. # Served as /.well-known/apple-app-site-association. PASSKEY_APPLE_APP_IDS=ABCDE12345.tech.orbin.prea,ABCDE12345.tech.orbin.prea.desktop # Android: SHA-256 fingerprints of the app signing certificates, comma-separated. # Served as /.well-known/assetlinks.json and accepted as passkey origins. PASSKEY_ANDROID_CERT_SHA256=AA:BB:...:FF ``` Until a platform's setting is set, the native app on that platform hides passkeys for this server. Both files are served through the web origin, so a reverse proxy in front of the web container must pass `/.well-known/` through to it.