Authentication

Sayna supports two authentication strategies. Choose the one that matches your deployment needs, or enable both. When both are configured Sayna first checks the API secret, then falls back to delegated JWT validation. Protected HTTP endpoints accept the authentication token via either method:

Header: Authorization: Bearer <token>
Query parameter: ?api_key=<token>

Both API Secret mode and JWT mode use the same token extraction behavior.

Token precedence and fallback

When both an Authorization header and an api_key query parameter are present, Sayna evaluates them in this order:

The Authorization header is evaluated first.
If the header format is invalid, the server falls back to the api_key query parameter.

If neither source provides a usable token, the request is rejected with missing_auth_header.

Quick summary

Mode	When to use	Highlights
API secret	Single-tenant deployments or trusted networks	Lowest latency, no external service, bearer-token comparison against `AUTH_API_SECRET`.
JWT + auth service	Multi-tenant or context-aware authorization	Sayna signs the entire request payload, calls out to your service, and trusts the HTTP status you return.

Toggle auth with the AUTH_REQUIRED environment variable. When it’s false, all endpoints accept unauthenticated requests.

Option A — API secret authentication

Setup steps

Generate a long random secret.
```
openssl rand -base64 32
```

Set the environment variables:

AUTH_REQUIRED=true
AUTH_API_SECRET=your-generated-secret

Clients send the secret as a bearer token in the header or as a query parameter:

# Using Authorization header (recommended)
curl -X POST http://localhost:3001/speak \
  -H "Authorization: Bearer your-generated-secret" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello world"}'

# Using query parameter
curl -X POST "http://localhost:3001/speak?api_key=your-generated-secret" \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello world"}'

Security notes

Use at least 32 random bytes; rotate periodically and never commit secrets to VCS.
Always terminate TLS before traffic reaches Sayna so the bearer token stays encrypted in transit.
Pair with IP allowlists when you use this mode for back-office tools.

Option B — Delegated JWT authentication

API secret not enough? Let your own service validate tokens and return 200/401 decisions.

1. Generate signing keys

# RSA
openssl genrsa -out auth_private_key.pem 2048
openssl rsa -in auth_private_key.pem -pubout -out auth_public_key.pem
chmod 600 auth_private_key.pem
chmod 644 auth_public_key.pem

# or ECDSA
openssl ecparam -genkey -name prime256v1 -noout -out auth_private_key.pem
openssl ec -in auth_private_key.pem -pubout -out auth_public_key.pem

2. Configure Sayna

AUTH_REQUIRED=true
AUTH_SERVICE_URL=https://your-auth-service.com/auth
AUTH_SIGNING_KEY_PATH=/path/to/auth_private_key.pem
AUTH_TIMEOUT_SECONDS=5

3. Implement the auth service

Your service must:

Accept POST requests whose body is the JWT Sayna generated.
Verify the JWT signature using the public key (RS256 or ES256).
Validate the extracted bearer token and any contextual data.
Return 200 OK (allow) or 401 Unauthorized (deny). Other 4xx map to 401, 5xx become 502, and timeouts surface as 503 upstream.

const express = require('express');
const jwt = require('jsonwebtoken');
const fs = require('fs');

const app = express();
const publicKey = fs.readFileSync('auth_public_key.pem');

app.post('/auth', express.text(), (req, res) => {
  try {
    const payload = jwt.verify(req.body, publicKey, { algorithms: ['RS256', 'ES256'] });
    const isValid = validateToken(payload.token);
    if (isValid) {
      res.status(200).send('OK');
    } else {
      res.status(401).send('Invalid token');
    }
  } catch (error) {
    res.status(401).send('JWT verification failed');
  }
});

app.listen(3000);

Environment variables

Variable	Required	Default	Description
`AUTH_REQUIRED`	No	`false`	Enable or disable authentication middleware.
`AUTH_API_SECRET`	Conditional	–	Shared secret for API secret auth.
`AUTH_SERVICE_URL`	Conditional	–	External auth service endpoint (JWT mode).
`AUTH_SIGNING_KEY_PATH`	Conditional	–	Path to private key used to sign the JWT payload.
`AUTH_TIMEOUT_SECONDS`	No	`5`	Timeout for auth service requests.

When AUTH_REQUIRED=true you must specify either AUTH_API_SECRET or both AUTH_SERVICE_URL and AUTH_SIGNING_KEY_PATH. You can configure both to let Sayna short-circuit known service-to-service traffic with the secret and route user traffic through the JWT flow.

JWT payload schema (delegated mode)

{
  "sub": "sayna-auth",
  "iat": 1234567890,
  "exp": 1234568190,
  "auth_data": {
    "token": "extracted-token-from-header-or-query",
    "request_body": {"text": "request body as JSON"},
    "request_headers": {
      "content-type": "application/json",
      "user-agent": "client-agent"
    },
    "request_path": "/speak",
    "request_method": "POST"
  }
}

sub: Always sayna-auth so your service knows who issued the JWT.
iat / exp: Issued-at plus 5-minute expiration.
auth_data.token: The extracted usable token, resolved from the Authorization header or the api_key query parameter (following the precedence rule above).
auth_data.request_body: JSON payload of the HTTP request.
auth_data.request_headers: Filtered headers (excludes authorization, cookie, x-forwarded-*, x-sayna-*, host, x-real-ip).
auth_data.request_path / request_method: Full request context for policy decisions.

Verification checklist

def verify_auth_request(jwt_string, public_key):
    payload = jwt.decode(jwt_string, public_key, algorithms=['RS256', 'ES256'])
    if payload['sub'] != 'sayna-auth':
        return 401, 'Invalid JWT subject'
    now = int(time.time())
    if abs(now - payload['iat']) > 60:
        return 401, 'JWT too old'
    auth_data = payload['auth_data']
    bearer_token = auth_data['token']
    if not is_valid_token(bearer_token):
        return 401, 'Invalid bearer token'
    return 200, 'OK'

Protected endpoints

When AUTH_REQUIRED=true the following endpoints require authentication:

POST /speak
GET /voices
POST /livekit/token
GET /livekit/rooms
GET /livekit/rooms/{room_name}
DELETE /livekit/participant
POST /livekit/participant/mute
GET /recording/{stream_id}
POST /sip/call
GET /sip/hooks
POST /sip/hooks
DELETE /sip/hooks
POST /sip/transfer

Public endpoints today:

GET / (health)
GET /ws (WebSocket handshake — see the WebSocket Auth roadmap below)

Room-scoped authorization

Beyond authentication, room-scoped endpoints enforce ownership via metadata.auth_id:

Endpoint	Ownership check
`POST /livekit/token`	Creates room with `metadata.auth_id` if missing; returns `403` if owned by another tenant.
`GET /livekit/rooms`	Filters to rooms matching `metadata.auth_id`.
`GET /livekit/rooms/{room_name}`	Returns `404` if `metadata.auth_id` doesn’t match.
`DELETE /livekit/participant`	Returns `404` if `metadata.auth_id` doesn’t match.
`POST /livekit/participant/mute`	Returns `404` if `metadata.auth_id` doesn’t match.
`POST /sip/call`	Creates room with `metadata.auth_id`; returns `404` if owned by another tenant.
`POST /sip/transfer`	Returns `404` if `metadata.auth_id` doesn’t match.

Room names are no longer prefixed or modified. Access control is enforced entirely through the metadata.auth_id field stored in room metadata.

WebSocket authentication status

WebSocket auth is not implemented yet. The open tasks from the design document:

Authenticate during the HTTP upgrade by reading query parameters or headers.
Require an auth payload inside the first config message.
Or leave /ws public but scope LiveKit mirroring to trusted rooms.

Today, Sayna runs with Option C (no WebSocket auth). Use network isolation or API Gateways until JWT enforcement ships.

Usage examples

# API secret — header
curl -X GET http://localhost:3001/voices \
  -H "Authorization: Bearer $AUTH_API_SECRET"

# API secret — query parameter
curl -X GET "http://localhost:3001/voices?api_key=$AUTH_API_SECRET"

# JWT-based — header
curl -X POST http://localhost:3001/speak \
  -H "Authorization: Bearer user-jwt-token" \
  -H "Content-Type: application/json" \
  -d '{"text": "Different user"}'

# JWT-based — query parameter
curl -X POST "http://localhost:3001/speak?api_key=user-jwt-token" \
  -H "Content-Type: application/json" \
  -d '{"text": "Different user"}'

Client guidance

Recommended default: Use the Authorization: Bearer <token> header whenever possible. Header-based auth keeps tokens out of URL strings, server logs, and browser history. When to use query parameter auth: The ?api_key=<token> query parameter is practical in environments where adding custom headers is difficult — for example, browser redirects, webhook callbacks from third-party services, or server-sent event streams.

Tokens passed as query parameters can be logged in URL logs, proxy access logs, and analytics tooling. Always use HTTPS and avoid logging full URLs when query auth is used.

Backward compatibility

Existing header-based clients continue to work unchanged.
Query-based auth is additive and non-breaking.
Clients currently sending an invalid Authorization header alongside a valid api_key query parameter will now authenticate successfully via fallback.

Scope clarification

This dual-input auth behavior applies to protected HTTP endpoints only. It does not change:

The WebSocket auth model (see WebSocket authentication status below).
The LiveKit webhook signature verification flow, which uses its own signing mechanism independent of bearer tokens.

Provider-level credentials are separate from server-level authentication. In addition to the API secret and JWT strategies described above, Sayna supports per-session and per-request provider credential overrides via the auth field in STT/TTS config objects. This allows multi-tenant clients to supply their own Deepgram, ElevenLabs, Cartesia, Google, or Azure credentials without changing server configuration. See the WebSocket guide for details.

Error responses

{
  "error": "error_code",
  "message": "Human-readable error message"
}

Error code	HTTP status	Description
`missing_auth_header`	401	No usable token was found in either the `Authorization` header or the `api_key` query parameter.
`invalid_auth_header`	401	Header format is invalid and no valid `api_key` fallback was provided.
`unauthorized`	401	Token validation failed.
`auth_service_error`	401 or 502	Auth service returned 4xx/5xx.
`auth_service_unavailable`	503	Auth service unreachable or timed out.
`config_error`	500	Misconfigured auth flags/keys.
`jwt_signing_error`	500	Failed to sign JWT payload.

Mapping auth service responses

Auth service status	Sayna response	Meaning
`200 OK`	`200 OK`	Token valid; request proceeds.
`401 Unauthorized`	`401 Unauthorized`	Invalid token; client should refresh credentials.
Other `4xx`	`401 Unauthorized`	Client error mapped to unauthorized.
`5xx`	`502 Bad Gateway`	Temporary auth service failure.
Timeout / network error	`503 Service Unavailable`	Auth service unreachable.

Security considerations

Private keys: Store private keys with chmod 600, never commit them, and rotate periodically.
Network security: Run Sayna + auth service over HTTPS/TLS. Consider mutual TLS between the two if you run them across trust zones.
Token validation: Reject replayed JWTs by checking iat; combine with short expirations.
Error handling: Return generic error bodies to clients but log detailed errors internally for auditing.
Replay protection: Compare iat against now (±60 seconds) before trusting the payload.

Always verify the JWT signature and the embedded request hash before trusting delegated responses. Skipping either check makes it possible to replay tampered requests.

Overview

Build with Sayna

Client libraries

Telephony & SIP

Operate

Authentication

Token precedence and fallback

Quick summary

Option A — API secret authentication

Setup steps

Security notes

Option B — Delegated JWT authentication

1. Generate signing keys

2. Configure Sayna

3. Implement the auth service

Environment variables

JWT payload schema (delegated mode)

Verification checklist

Protected endpoints

Room-scoped authorization

WebSocket authentication status

Usage examples

Client guidance

Backward compatibility

Scope clarification

Error responses

Mapping auth service responses

Security considerations

Overview

Build with Sayna

Client libraries

Telephony & SIP

Operate

Documentation Index

​Token precedence and fallback

​Quick summary

​Option A — API secret authentication

​Setup steps

​Security notes

​Option B — Delegated JWT authentication

​1. Generate signing keys

​2. Configure Sayna

​3. Implement the auth service

​Environment variables

​JWT payload schema (delegated mode)

​Verification checklist

​Protected endpoints

​Room-scoped authorization

​WebSocket authentication status

​Usage examples

​Client guidance

​Backward compatibility

​Scope clarification

​Error responses

​Mapping auth service responses

​Security considerations

Token precedence and fallback

Quick summary

Option A — API secret authentication

Setup steps

Security notes

Option B — Delegated JWT authentication

1. Generate signing keys

2. Configure Sayna

3. Implement the auth service

Environment variables

JWT payload schema (delegated mode)

Verification checklist

Protected endpoints

Room-scoped authorization

WebSocket authentication status

Usage examples

Client guidance

Backward compatibility

Scope clarification

Error responses

Mapping auth service responses

Security considerations