Learning outcomes
- Select an enforcement layer and client path for each application protocol.
- Trace browser, API, service, and non-HTTP identity through the complete request path.
- Protect upstream identity assertions and separate route permission from object permission.
- Close direct paths and validate failure, retry, and recovery behavior.
Scenario
One engineering service has a browser interface, an API used by automation, and an SSH administration path. The design needs separate routes, suitable client authentication, and the same narrow access intent across all three protocols.
Ordered learning units
Named Resource Access
Grant access to one named application or service without extending general reachability to its network or neighboring systems.
Choose the access enforcement layer
Place access enforcement across identity-aware proxies, API gateways, service meshes, load balancers, and network tunnels.
Upstream and Downstream
Upstream and downstream describe direction relative to one intermediary, so the reference point must be explicit.
Secure Route Selection
Select a route from trusted authority and path data so an attacker cannot redirect policy or credentials to the wrong upstream.
Gateway Bypass Path
Find every route that reaches a protected origin without the intended identity, policy, and evidence controls.
Trace an identity-aware application request
Trace DNS, TLS, authentication, session, route, policy, upstream, application authorization, response, and evidence.
Secure a browser session through an identity-aware proxy
Separate identity-provider, proxy, and application sessions while controlling cookies, CSRF, logout, renewal, and origin trust.
Design identity-aware API access
Protect API inventory, clients, routes, versions, objects, actions, credentials, quotas, and evidence with explicit owners.
WebSocket Access
WebSocket access starts with an HTTP upgrade and then carries long-lived bidirectional messages on one connection.
Design service-to-service access
Authenticate workloads, preserve human actor context, authorize target actions, and manage machine credentials through their lifecycle.
Design identity-aware TCP and UDP access
Map user identity and policy to non-HTTP connections while controlling clients, ports, names, lifetime, and protocol limits.
Protect private SSH and RDP administration
Design named administrative access with strong identity, narrow routes, native server controls, session limits, and evidence.
Pass verified identity to an upstream application
Carry signed identity context across a proxy boundary and validate issuer, audience, signature, time, and delivery path upstream.
Credential Injection
Credential injection supplies a bounded upstream credential after access policy allows a request.
Protect upstream identity headers from spoofing
Remove untrusted identity fields, authenticate the proxy path, validate signed assertions, and close direct-origin bypass.
Identity-Aware Rate Limiting
Identity-aware rate limiting bounds request volume by accountable subject, client, resource, action, and cost.
Evaluation questions
- Which browser, API, service, SSH, TCP, and UDP endpoints does the service require?
- Can each human or automation client complete the selected authentication path?
- Does the upstream validate trusted identity data and keep its own object permissions?
Completion conditions
- Draw and test every client-to-target path for one multi-protocol service.
- Prove unauthorized clients, forged identity, wrong object actions, and direct-origin requests fail.
