Implementing Embedded Application SSO Using SAML Assertion Relay Through Genesys Cloud

How-To-Articles
1

Implementing Embedded Application SSO Using SAML Assertion Relay Through Genesys Cloud

What This Guide Covers

This guide configures Genesys Cloud CX to relay a validated SAML 2.0 assertion from your corporate Identity Provider to a third-party embedded application without requiring secondary authentication. When complete, agents will authenticate once via SAML, and every embedded application container will receive a cryptographically signed assertion payload that the application backend validates to establish a secure session.

Prerequisites, Roles & Licensing

  • Licensing Tier: CX 1, CX 2, or CX 3 base license. The Embedded Apps feature requires no additional tier but mandates that the target application URL supports TLS 1.2 and returns valid CORS headers.
  • Granular Permissions: Embedded Apps > Configure, Authentication > SAML > Edit, Users > Edit, Telephony > Trunk > Edit (if routing SIP through the same identity boundary).
  • OAuth Scopes: embeddedapps:read, embeddedapps:write, sso:read, users:read, authentication:read.
  • External Dependencies: A SAML 2.0 compliant IdP (Azure AD, Okta, Ping, etc.), a backend service capable of validating SAML assertions with X.509 certificate chains, and a DNS-resolvable application endpoint with a valid public certificate.

The Implementation Deep-Dive

1. Configuring the SAML Identity Provider and Service Provider

Genesys Cloud acts as a SAML Service Provider (SP) during initial login. For embedded application relay, you must configure your corporate IdP to issue assertions that Genesys Cloud can validate and subsequently forward. The architecture relies on a trust chain where your IdP signs assertions with a certificate that Genesys Cloud stores, and your embedded application backend independently validates that same certificate.

Begin by registering Genesys Cloud as a SAML SP in your IdP. Set the Single Sign-On URL to https://login.genesiscloud.com/sso/saml. Set the Entity ID to https://login.genesiscloud.com/sso/saml. When mapping attributes, ensure NameID maps to the user email or objectGuid. Your IdP must return at minimum: email, givenName, sn, and displayName.

The Trap: Configuring the IdP to use urn:oasis:names:tc:SAML:2.0:nameid-format:transient for the NameID format. Transient identifiers are session-bound and cannot be reliably relayed to downstream applications. If your embedded application backend attempts to correlate the transient NameID with a persistent user database, the session will fail on every assertion refresh. Always use persistent or emailAddress name ID formats. The downstream application requires a stable identifier to map the SAML assertion to an internal user record without maintaining a separate IdP lookup service.

After IdP registration, upload the IdP metadata XML into Genesys Cloud via Admin > Authentication > SAML. The metadata must contain a valid <md:IDPSSODescriptor> block with a <md:KeyDescriptor use="signing"> element containing a SHA-256 certified X.509v3 certificate. Genesys Cloud validates the signature algorithm during metadata ingestion. If the certificate uses SHA-1, the import will silently fail validation during runtime assertion processing, causing authentication loops that consume IdP throughput.

2. Registering the Embedded Application in Genesys Cloud

Once the SAML trust is established, you must register the embedded application container. This step defines how Genesys Cloud injects the relayed assertion into the application URL. Navigate to Admin > Embedded Apps > Applications and create a new entry.

Configure the following fields:

  • Application Name: Internal identifier (e.g., CRM-Embedded-Relay)
  • Application URL: The base URL of your embedded application (e.g., https://crm.example.com/genesys-embed)
  • User Filter: A Genesys Cloud Architect expression or static group assignment (e.g., user.groups[*].id == 'GROUP_ID')
  • SAML Assertion Relay: Enable Pass SAML Assertion to Application
  • Relay Method: Select Query Parameter or POST Message. Query parameter relay passes the base64-encoded assertion in the URL fragment. POST message relay uses the Genesys Embedded Apps SDK to securely transmit the assertion via window.postMessage.

When using query parameter relay, Genesys Cloud appends ?saml_assertion={base64url_encoded_assertion} to the configured URL. The assertion is URL-safe base64 encoded and does not contain whitespace or padding characters that could break URL parsing.

The Trap: Allowing the embedded application URL to redirect to a different origin without preserving the query parameter. If your application backend implements a 302 redirect for load balancing or regional routing, the SAML assertion query parameter is often stripped by reverse proxies or lost during redirect loops. This forces the application to request a new assertion, triggering unnecessary IdP calls and degrading agent login times. Configure your reverse proxy (Nginx, AWS ALB, F5) to preserve query parameters during all HTTP 3xx redirects, and strictly enforce SameSite=None; Secure; HttpOnly on any session cookies your application sets.

3. Configuring the SAML Assertion Relay and Security Bindings

The relay mechanism depends on strict audience restriction and signature validation. Genesys Cloud does not modify the SAML assertion during relay. It forwards the exact assertion issued by your IdP. This means your embedded application backend must validate the assertion against the same IdP certificate chain that Genesys Cloud uses.

Configure your application backend to parse the incoming saml_assertion parameter. The payload is a base64url-encoded XML document conforming to the SAML 2.0 specification. Decode it and validate the following claims:

  • Issuer matches your IdP Entity ID
  • Audience contains your application backend URL or a designated audience URI
  • Signature validates against the IdP signing certificate
  • Conditions.NotBefore and Conditions.NotAfter are within acceptable clock skew boundaries (maximum 300 seconds recommended)

If your IdP does not natively support multiple audience restrictions, configure a secondary audience URI in the IdP SAML application settings that matches your embedded application backend. Genesys Cloud will not validate the audience claim during relay; it only validates that the assertion is structurally sound and cryptographically signed. The downstream application bears full responsibility for audience validation.

The Trap: Storing the IdP signing certificate as a static file without implementing automated rotation. SAML certificates typically expire every 12 to 24 months. When the certificate expires, Genesys Cloud continues to accept the assertion for initial login if you have configured certificate fallback, but the embedded application backend will reject the relayed assertion because the validation library detects an expired NotAfter timestamp. This creates a split-brain authentication state where agents can log into Genesys Cloud but cannot load any embedded applications. Implement a certificate monitoring pipeline that triggers a 90-day alert before expiration and automate the metadata refresh in both Genesys Cloud and your application backend.

4. Validating the Token Exchange and Assertion Delivery

Verification requires intercepting the relayed assertion and confirming structural integrity. Use the Genesys Cloud REST API to inspect the embedded application configuration and validate the relay payload.

Retrieve the embedded application configuration:

GET /api/v2/embeddedapps/{embeddedAppId}
Authorization: Bearer <access_token>

Response payload structure:

{
  "id": "e8a9c1b2-4d3f-4a5b-9c8d-7e6f5a4b3c2d",
  "name": "CRM-Embedded-Relay",
  "url": "https://crm.example.com/genesys-embed",
  "samlAssertionRelay": {
    "enabled": true,
    "method": "queryParameter",
    "audienceRestriction": "https://crm.example.com/genesys-embed"
  },
  "userFilter": "user.groups[*].id == 'GROUP_ID'",
  "createdDate": "2024-01-15T10:30:00.000Z",
  "modifiedDate": "2024-01-15T10:30:00.000Z"
}

To test assertion delivery, construct a synthetic SAML assertion, base64url encode it, and append it to the application URL. Your backend must log the raw assertion before validation. A correctly relayed assertion contains the following XML structure:

<samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" ID="_a1b2c3d4" Version="2.0" IssueInstant="2024-01-15T12:00:00Z" Destination="https://login.genesiscloud.com/sso/saml">
  <saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">https://idp.example.com/adfs/services/trust</saml:Issuer>
  <samlp:Status>
    <samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
  </samlp:Status>
  <saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_x9y8z7w6" Version="2.0" IssueInstant="2024-01-15T12:00:00Z">
    <saml:Issuer>https://idp.example.com/adfs/services/trust</saml:Issuer>
    <saml:Subject>
      <saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">agent@example.com</saml:NameID>
      <saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
        <saml:SubjectConfirmationData NotOnOrAfter="2024-01-15T12:10:00Z" Recipient="https://login.genesiscloud.com/sso/saml"/>
      </saml:SubjectConfirmation>
    </saml:Subject>
    <saml:Conditions NotBefore="2024-01-15T11:55:00Z" NotOnOrAfter="2024-01-15T12:10:00Z">
      <saml:AudienceRestriction>
        <saml:Audience>https://crm.example.com/genesys-embed</saml:Audience>
      </saml:AudienceRestriction>
    </saml:Conditions>
    <saml:AuthnStatement AuthnInstant="2024-01-15T12:00:00Z" SessionIndex="_s1t2u3v4">
      <saml:AuthnContext>
        <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:Password</saml:AuthnContextClassRef>
      </saml:AuthnContext>
    </saml:AuthnStatement>
  </saml:Assertion>
</samlp:Response>

Your backend must reject the assertion if SubjectConfirmationData.NotOnOrAfter has elapsed. Genesys Cloud does not enforce this timestamp during relay. The embedded application backend must enforce it to prevent assertion replay attacks. Implement a sliding window validation that allows a maximum 300-second drift to account for NTP synchronization delays across distributed data centers.

The Trap: Logging the raw SAML assertion in plaintext application logs during development and failing to sanitize the logs before production deployment. SAML assertions contain PII, email addresses, and sometimes custom attributes that map to employee IDs or role assignments. If your logging framework outputs the full URL or request body, the assertion becomes visible to anyone with log access. Configure your backend to hash the assertion payload before logging, and strip the saml_assertion query parameter from access logs. Use a dedicated audit log pipeline for SAML validation events that records only the assertion ID, validation status, and timestamp.

Validation, Edge Cases & Troubleshooting

Edge Case 1: Assertion Audience Mismatch Under Load

The failure condition manifests as agents successfully logging into Genesys Cloud but encountering a 401 Unauthorized response when the embedded application container initializes. The root cause is a misconfigured audience restriction in the IdP SAML application settings. When Genesys Cloud scales to handle high concurrent login volumes, the IdP may issue assertions with slightly different audience URIs due to load-balanced metadata caching or multi-region IdP deployments. The embedded application backend rejects the assertion because the audience URI does not exactly match the configured allowed list.

The solution requires configuring the IdP to include both the Genesys Cloud SP Entity ID and the embedded application backend URL in the <saml:Audience> element. SAML 2.0 supports multiple audience restrictions within a single assertion. Update your IdP SAML application configuration to include:

<saml:AudienceRestriction>
  <saml:Audience>https://login.genesiscloud.com/sso/saml</saml:Audience>
  <saml:Audience>https://crm.example.com/genesys-embed</saml:Audience>
</saml:AudienceRestriction>

This configuration allows the assertion to satisfy validation in both Genesys Cloud and the embedded application backend without requiring separate IdP application registrations.

Edge Case 2: Clock Skew and NotBefore/NotAfter Validation Failures

The failure condition presents as intermittent embedded application load failures that resolve after a browser refresh. The root cause is NTP synchronization drift between the IdP, Genesys Cloud edge nodes, and your embedded application backend servers. SAML assertions are time-bound. If your backend server clock runs 45 seconds ahead of the IdP clock, the NotBefore timestamp appears in the future, and the validation library rejects the assertion as invalid.

The solution requires enforcing strict NTP synchronization across all infrastructure tiers. Configure your IdP, Genesys Cloud proxy endpoints, and embedded application backend to use the same NTP stratum 1 or 2 source. Implement a validation tolerance window in your backend SAML parser that allows a maximum 120-second drift. Most SAML validation libraries (OSLib, xmlsec, passport-saml) expose a clockDriftSeconds parameter. Set this value to 120 and monitor assertion rejection rates. If rejections exceed 2 percent of total requests, investigate network latency or DNS resolution delays that may be causing timestamp calculation errors during assertion generation.

Edge Case 3: Post-Binding CSRF and Assertion Replay Attacks

The failure condition involves malicious actors capturing a relayed SAML assertion from the browser network tab and replaying it to the embedded application backend to impersonate an agent. The root cause is using the POST message relay method without implementing origin validation, or using query parameter relay without enforcing HTTPS-only session cookies. SAML assertions are bearer tokens. If transmitted over HTTP or stored in browser history, they can be intercepted and replayed.

The solution requires enforcing strict transport security and binding the assertion to the session context. Configure your embedded application backend to validate the Origin and Referer headers against a whitelist of approved Genesys Cloud domains. Implement a one-time use assertion validation mechanism by maintaining a short-lived cache of processed assertion IDs. When the backend receives an assertion, check if the ID attribute exists in the cache. If it does, reject the request. If it does not, store the ID with a 60-second TTL and proceed with validation. This prevents replay attacks without requiring stateful session management on the IdP side. Additionally, configure Strict-Transport-Security headers with includeSubDomains and max-age=31536000 on all embedded application endpoints to prevent downgrade attacks.

Official References