feat(canon): add Privileged Execution Control standard v0.2 and schemas

Maturity model and schemas for handling necessary privilege escalation
across three contexts: OS sudo, Kubernetes RBAC, and CI/CD pipelines.
To be applied to the codebase once initial Railiance setup is complete.

Files:
- privileged-execution-control_v0.2 (standard)
- privileged-execution-control-schema_v0.2.1.md (base schema)
- privileged-execution-control-schema-os-sudo_v0.2.1.md
- privileged-execution-control-schema-kubernetes-rbac_v0.2.1.md
- privileged-execution-control-schema-cicd_v0.2.1.md

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

canon/standards/privileged-execution-control_v0.2

@@ -0,0 +1,540 @@
+PrivilegedExecutionControlStandard
+
+*Maturity model to minimize privileged attack surfaces*
+
+# Privileged Execution Control Standard (PECS)
+
+### A maturity model and reference framework for controlling privileged execution in software systems
+
+**Version:** 0.2 (Draft)
+**Status:** Candidate Architecture Standard
+**Authoring Context:** DevSecOps / Platform Engineering / Secure Automation
+**Audience:**
+
+* Software architects
+* DevOps engineers
+* Security engineers
+* CI/CD maintainers
+* AI coding agents operating within repositories
+
+---
+
+# 1. Purpose
+
+The **Privileged Execution Control Standard (PECS)** defines a structured approach to controlling **privileged operations** in software systems.
+
+It provides:
+
+1. **Terminology and conceptual model**
+2. **A multidimensional maturity assessment**
+3. **Design patterns for privilege boundaries**
+4. **Implementation guidance for common environments**
+5. **Mapping to existing security frameworks**
+
+The goal is to ensure that systems:
+
+* minimize privileged attack surfaces
+* provide deterministic authorization of privileged operations
+* enable secure automation
+* remain auditable and maintainable
+
+---
+
+# 2. Scope
+
+PECS applies to **software systems that contain privileged operations**, including:
+
+* DevOps pipelines
+* build systems
+* operational tooling
+* infrastructure automation
+* platform management systems
+* cluster orchestration
+
+Privileged execution environments include:
+
+* OS-level root privileges
+* container runtime privileges
+* Kubernetes cluster permissions
+* administrative API credentials
+* infrastructure automation roles
+
+---
+
+# 3. Core Security Principles
+
+PECS builds on established security principles.
+
+## 3.1 Least Privilege
+
+Privileged permissions must be limited to **the smallest possible scope**.
+
+---
+
+## 3.2 Explicit Privilege Boundaries
+
+All privileged execution must occur through **clearly defined entry points**.
+
+---
+
+## 3.3 Deterministic Authorization
+
+Privilege elevation must rely on **explicit authorization mechanisms**, not implicit behavior.
+
+---
+
+## 3.4 Integrity Binding
+
+Authorization must bind to **specific executable artifacts**.
+
+---
+
+## 3.5 Auditability
+
+The system must provide verifiable answers to:
+
+* What privileged operations exist?
+* Who approved them?
+* What code was approved?
+* What executed?
+
+---
+
+# 4. Conceptual Model
+
+The PECS conceptual model is **implementation independent**.
+
+## 4.1 Privileged Execution
+
+An operation requiring elevated authority beyond the normal execution context.
+
+Examples:
+
+* root access
+* administrative API access
+* cluster-level operations
+* privileged containers
+
+---
+
+## 4.2 Privileged Entry Point (PEP)
+
+A programmatic interface that performs privileged actions.
+
+Examples:
+
+```
+backup-root
+rootctl snapshot
+kubectl apply (cluster-admin)
+```
+
+---
+
+## 4.3 Privileged Invocation
+
+The act of executing a privileged entry point.
+
+---
+
+## 4.4 Privileged Execution Surface (PES)
+
+The set of all privileged entry points in a system.
+
+---
+
+## 4.5 Privileged Authorization Artifact (PAA)
+
+A machine-readable document defining which privileged operations are approved.
+
+---
+
+## 4.6 Integrity Binding
+
+A mechanism that links approval to a **specific artifact version**.
+
+Examples:
+
+* SHA256 digest
+* signed binary
+* provenance metadata
+
+---
+
+## 4.7 Privileged Execution Gateway (PEG)
+
+A centralized system responsible for executing privileged actions.
+
+Example:
+
+```
+rootctl
+```
+
+---
+
+# 5. Multidimensional Maturity Model
+
+PECS maturity is evaluated along **five independent dimensions**.
+
+| Dimension                | Description                   |
+| ------------------------ | ----------------------------- |
+| Privilege Boundary       | isolation of privileged logic |
+| Authorization Governance | approval workflow             |
+| Integrity Assurance      | binding approvals to code     |
+| Execution Enforcement    | runtime enforcement           |
+| Auditability             | execution tracking            |
+
+---
+
+# 6. Maturity Levels
+
+Each dimension has maturity levels from **0–5**.
+
+---
+
+# 6.1 Dimension 1 — Privilege Boundary Isolation
+
+| Level | Description                       |
+| ----- | --------------------------------- |
+| 0     | privilege used anywhere           |
+| 1     | privilege isolated in scripts     |
+| 2     | dedicated privileged entry points |
+| 3     | centralized gateway               |
+| 4     | restricted execution environment  |
+| 5     | formally defined privileged API   |
+
+---
+
+# 6.2 Dimension 2 — Authorization Governance
+
+| Level | Description                       |
+| ----- | --------------------------------- |
+| 0     | no approval process               |
+| 1     | manual review                     |
+| 2     | documented allowlist              |
+| 3     | fingerprint approval              |
+| 4     | signed approvals                  |
+| 5     | policy-based automated governance |
+
+---
+
+# 6.3 Dimension 3 — Integrity Assurance
+
+| Level | Description               |
+| ----- | ------------------------- |
+| 0     | no verification           |
+| 1     | manual checks             |
+| 2     | checksums                 |
+| 3     | hash verification         |
+| 4     | signed artifacts          |
+| 5     | supply chain attestations |
+
+---
+
+# 6.4 Dimension 4 — Execution Enforcement
+
+| Level | Description                    |
+| ----- | ------------------------------ |
+| 0     | uncontrolled privilege use     |
+| 1     | wrapper enforcement            |
+| 2     | tool-level restrictions        |
+| 3     | platform enforcement           |
+| 4     | policy engines                 |
+| 5     | zero-trust privilege mediation |
+
+---
+
+# 6.5 Dimension 5 — Auditability
+
+| Level | Description                |
+| ----- | -------------------------- |
+| 0     | no logging                 |
+| 1     | local logs                 |
+| 2     | structured logs            |
+| 3     | centralized logging        |
+| 4     | tamper-resistant logs      |
+| 5     | cryptographic audit trails |
+
+---
+
+# 7. Example Maturity Assessment
+
+Example system:
+
+| Dimension    | Level |
+| ------------ | ----- |
+| Boundary     | 2     |
+| Governance   | 2     |
+| Integrity    | 3     |
+| Enforcement  | 2     |
+| Auditability | 1     |
+
+Result:
+
+```
+PECS maturity profile:
+(2,2,3,2,1)
+```
+
+This allows targeted improvements.
+
+---
+
+# 8. Reference Authorization Artifact
+
+Example YAML:
+
+```yaml
+version: 1
+
+privileged_commands:
+
+  - id: backup
+    entrypoint: scripts/backup-root
+    sha256: 3d9c9c21d0c82a4c9f
+    reviewer: security-team
+    approved: 2026-03-10
+
+  - id: snapshot
+    entrypoint: scripts/snapshot-root
+    sha256: 7e2f15b1c93b
+```
+
+---
+
+# 9. Privileged Invocation Contract
+
+Every PEP should define:
+
+* command identity
+* allowed arguments
+* execution context
+* expected effects
+
+Example:
+
+```
+rootctl snapshot
+arguments:
+  volume: string
+allowed-callers:
+  CI-backup
+```
+
+---
+
+# 10. Implementation Guides
+
+The following chapters map PECS to practical environments.
+
+---
+
+# 11. Implementation Guide — Linux / sudo
+
+## Design Pattern
+
+```
+make backup
+  |
+prepare.sh
+  |
+sudo rootctl backup
+```
+
+---
+
+## Example root entrypoint
+
+```bash
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ "$EUID" -ne 0 ]]; then
+  echo "ERROR: must run as root"
+  exit 1
+fi
+
+case "$1" in
+backup)
+   ./backup-logic.sh
+   ;;
+*)
+   echo "unknown command"
+   exit 1
+esac
+```
+
+---
+
+## sudoers example
+
+```
+ci-runner ALL=(root) NOPASSWD: /usr/local/bin/rootctl
+```
+
+---
+
+## Hash validation example
+
+```
+sha256sum rootctl
+```
+
+---
+
+# 12. Implementation Guide — Kubernetes / RBAC
+
+Privilege boundaries map to **cluster roles**.
+
+Example:
+
+```
+ClusterRole: backup-controller
+```
+
+---
+
+Example policy:
+
+```
+apiGroups:
+- ""
+resources:
+- persistentvolumes
+verbs:
+- get
+- list
+```
+
+---
+
+Privileged gateway concept becomes:
+
+```
+controller operator
+```
+
+---
+
+# 13. Implementation Guide — CI/CD Pipelines
+
+Example:
+
+```
+pipeline
+ |
+build
+ |
+privileged step
+ |
+deploy
+```
+
+Privileged step invokes **approved gateway**.
+
+---
+
+Example GitHub Action:
+
+```
+sudo rootctl deploy
+```
+
+---
+
+Policy checks verify:
+
+* artifact fingerprint
+* approval metadata
+
+---
+
+# 14. Assessment Procedure
+
+Assess a system using:
+
+1. Identify privileged operations
+2. Map entry points
+3. Evaluate each maturity dimension
+4. Produce maturity profile
+5. Identify gaps
+6. generate improvement roadmap
+
+---
+
+# 15. Regulatory Mapping
+
+PECS aligns with:
+
+| Standard        | Relevant Controls      |
+| --------------- | ---------------------- |
+| NIST 800-53     | AC-6, CM-3, SI-7       |
+| NIST Zero Trust | policy enforcement     |
+| OWASP CI/CD     | least privilege        |
+| CIS Controls    | privilege management   |
+| SLSA            | supply chain integrity |
+
+---
+
+# 16. Enterprise Tooling Mapping
+
+Common enterprise tools implementing similar concepts.
+
+| Category       | Examples              |
+| -------------- | --------------------- |
+| PAM systems    | CyberArk, BeyondTrust |
+| Policy engines | OPA                   |
+| CI/CD security | GitHub OIDC policies  |
+| Audit logging  | Splunk                |
+
+PECS can integrate with these.
+
+---
+
+# 17. Appendix — Terminology
+
+PEP — Privileged Entry Point
+PES — Privileged Execution Surface
+PAA — Privileged Authorization Artifact
+PEG — Privileged Execution Gateway
+
+---
+
+# 18. Appendix — Relationship to Existing Patterns
+
+Similar concepts exist in:
+
+* sudo command restrictions
+* Microsoft JEA
+* Kubernetes RBAC
+* in-toto supply chain controls
+
+PECS unifies these into **one architectural model**.
+
+---
+
+# 19. Future Extensions
+
+Potential additions:
+
+* signed execution policies
+* hardware root of trust
+* runtime policy agents
+* AI-assisted security review
+
+---
+
+# Summary
+
+This refined standard provides:
+
+✔ stable abstract model
+✔ multidimensional maturity framework
+✔ practical implementation guides
+✔ regulatory mapping
+✔ extensibility across environments
+
+
+xxx