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[Feature Request] Streamline FAST stage IAM impersonation tooling to reduce cross-stage 403 errors

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#253 0 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
5/5
Tiempo estimado
Más de una semana
Aptitud para principiantes
38/100
Tipo de issue
Nueva funcionalidad
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
shell, terraform
Área
cloud, devops, infrastructure, security

Línea de trabajo

Start by inspecting the existing tooling in scripts/ or fast/, especially deploy.sh, and review how stage-specific .tfvars and impersonation environment variables are handled. Compare the proposed helper, pre-flight authorization check, and docs/ddg.md troubleshooting section with current workflows; done means the selected scope is implemented and cross-stage 403 recovery is documented.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Documentation Enhancement Level of Effort - Medium Priority - Medium Scope - Fast

Feature Description

Provide developer experience utilities, active-context indicators, and streamlined helper tooling for managing service account impersonation across Fabric FAST deployment stages.

Use Case

Fabric FAST enforces least-privilege architecture by dedicating separate service accounts to each deployment stage (0-bootstrap, 1-resman, 2-networking, 3-security). Operators must switch service account impersonation contexts each time they transition between stages or inspect cross-stage resources.

In practice, this frequent context switching causes recurring authorization errors (403 Forbidden) when operators run commands against a stage while still impersonating a previous stage's service account. This creates cognitive overload, friction during cross-stage troubleshooting, and client frustration.

Proposed Solution

  1. Stage Activation / Context Helper: Provide a lightweight helper script or shell function (e.g., within scripts/ or fast/) that exports the appropriate GOOGLE_IMPERSONATE_SERVICE_ACCOUNT / CLOUDSDK_AUTH_IMPERSONATE_SERVICE_ACCOUNT environment variable, checks credentials, and prepares stage-specific .tfvars in one command.
  2. Pre-flight Stage Authorization Verification: Add a check in stage tooling or deploy.sh that validates whether the currently active identity has permission to impersonate the target stage service account before running terraform plan or apply.
  3. Enhanced Cross-Stage Debugging Documentation: Add an explicit cross-stage IAM impersonation matrix and troubleshooting section in docs/ddg.md explaining how to debug permissions and recover from common 403 scenarios.

Compliance & Deployment Context

  • Target Deployment Type(s):
    • US Region Restricted (e.g., Access Policy constraint)
    • FedRAMP Medium
    • FedRAMP High
    • FedRAMP Moderate
    • DoD IL4
    • DoD IL5
    • All / General
  • Relevant NIST 800-53r5 Controls: AC-02 (Account Management), AC-06 (Least Privilege), IA-02 (Identification and Authentication)

Reusability Check

  • I have checked if this functionality can be achieved by extending an existing module or blueprint.
  • I have verified that this does not duplicate existing functionality.

Alternatives Considered

  • Consolidating into a single administrative service account: Rejected because it violates least privilege, separation of duties, and FedRAMP / DoD IL5 compliance requirements.
  • Manual variable exports only: Currently causes frequent 403 errors and developer confusion when switching stages.

Additional Context

Improving the developer experience around multi-stage impersonation preserves strict security boundaries while eliminating the primary source of authorization errors during deployments.

Lenguaje dominante
HCL
Estrellas
55
Forks
21
Merge medio
1 d 22 h
PR fusionados (30 d)
24

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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