> tpl_air_036
Agent Identity, Credential and Permission Design
Zero Trust security architecture and privilege delegation design for autonomous AI agents, standardizing workload identities (SPIFFE/OIDC), short-lived ephemeral token minting, on-behalf-of (OBO) user authorization chains, OAuth scope attenuation, and audit-logged non-repudiation envelopes.
Agent security architecture standardizing workload identity (SPIFFE), ephemeral tokens, on-behalf-of delegation, and scope attenuation.
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Problem Solved
Engineering teams grant AI agents hardcoded superuser API keys or wide service-account permissions, allowing a single prompt injection attack to compromise the entire corporate cloud perimeter.
When to Use
- •Designing authentication and authorization architectures for autonomous AI agents and background workers
- •Implementing On-Behalf-Of (OBO) delegation where an agent acts strictly within the permission bounds of the human user
- •Eliminating static, long-lived API tokens in favor of short-lived (15-minute) ephemeral cryptographic credentials
When NOT to Use
- •For overarching human corporate SSO, Okta/Azure AD workforce identity directories (use TPL-SEC-008)
- •For cataloging individual tool endpoints and MCP servers (use TPL-AIR-035)
5 Template Sections & Structural Outline
Distinguishing Agent Workload Identity (who the software is) from Subject Delegation (the human user whose permissions constrain the agent). Resolving the dual-identity challenge via cryptographic claims.
Eliminating static API keys: Using SPIFFE / SPIRE workload attestation to verify running agent container integrity and minting short-lived (5 to 15 minute) JWT tokens signed by an internal identity provider.
Implementing RFC 8693 OAuth 2.0 Token Exchange: The agent trades the user's authorization code for an attenuated downstream token that strips administrative scopes (e.g. converting user:admin to read:tickets).
Creating tamper-proof execution traces: Every tool invocation is wrapped in a signed audit envelope containing the agent ID, human user ID, timestamp, input parameter hash, and the model prompt hash.
Restricting agent execution environments: Running agents in isolated containers, binding mTLS certificates, enforcing strict egress firewall rules, and blocking access to AWS metadata services (IMDSv2).
Completion Instructions
Independent Review Checklist
- All mandatory sections completed
- No secrets or passwords included
- Executive sponsor sign-off obtained
Agent Identity, Credential and Permission Design - Worked Case Study
Fictional Entity: Enterprise Autonomous SRE Agent resolving production incidents across Kubernetes clusters
Real-world production case study demonstrating complete operational adoption for Enterprise Autonomous SRE Agent resolving production incidents across Kubernetes clusters.
- •Eliminated 100% of static cluster admin credentials through SPIFFE workload identity and 15-minute ephemeral tokens
- •Implemented RFC 8693 scope attenuation ensuring autonomous agents cannot execute destructive cluster deletes
- •Generated cryptographic non-repudiation audit traces for every production pod restart and telemetry query
Frequently Asked Questions
Why must AI agents never be given long-lived static API credentials?
LLMs are inherently vulnerable to Indirect Prompt Injection: a malicious string inside an untrusted document or web page can hijack the model's reasoning and instruct it to execute API calls. If the agent holds a static superuser API key, the attacker gains persistent root access. Short-lived ephemeral tokens (15-minute TTL) with attenuated scopes limit the blast radius to zero persistent compromise.
How does the "On-Behalf-Of" (OBO) token exchange pattern enforce Least Privilege?
In the OBO pattern, the agent does not act under its own unilateral authority. It takes the human user's authenticated session token and exchanges it via RFC 8693 for a downscoped delegated token. If the human user only has "Viewer" permissions on the financial database, the agent's delegated token mathematically cannot execute "Writer" or "Admin" mutations.
What is a Non-Repudiation Audit Envelope in autonomous agent architectures?
A Non-Repudiation Audit Envelope is a tamper-proof cryptographic JSON log entry wrapping every tool invocation. It contains: 1. Agent Container Identity (SPIFFE ID), 2. Delegating Human User ID, 3. Timestamp, 4. Hash of the incoming LLM prompt, 5. Exact tool parameters, and 6. An internal HMAC signature, proving mathematically who authorized and executed the action.
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Authoritative Sources
- NIST Special Publication 800-207: Zero Trust ArchitectureNational Institute of Standards and Technology • OFFICIAL REQUIREMENT
- RFC 8693: OAuth 2.0 Token Exchange SpecificationInternet Engineering Task Force (IETF) • OFFICIAL REQUIREMENT
- SPIFFE: Secure Production Identity Framework for Everyone SpecificationCloud Native Computing Foundation (CNCF) • OFFICIAL REQUIREMENT