A step-by-step implementation guide for hardening Oracle Cloud Infrastructure identity and access management to Zero Trust principles across a multi-compartment tenancy.
Step 1: Establish a compartment-based least-privilege structure
Design your compartment hierarchy around organizational and workload boundaries before writing a single IAM policy — retrofitting compartment structure after policies exist means rewriting nearly every policy statement.
Use IAM policy statements scoped to specific compartments rather than the tenancy root wherever possible, even though root-level policies are faster to write initially.
Step 2: Enforce MFA and federate identity
Federate with your enterprise identity provider (Azure AD, Okta, or similar) via SAML/OIDC rather than maintaining local OCI IAM users for anyone beyond a small set of break-glass administrative accounts.
Require MFA at the identity provider level so it applies consistently across every federated application, not just OCI Console access.
Step 3: Implement dynamic groups for workload identity
Use dynamic groups matching instance principals or resource principals so applications authenticate using their own identity rather than embedded API keys — this eliminates a whole class of credential-leakage risk.
Step 4: Enable continuous monitoring
Stream OCI Audit logs to a SIEM and alert on policy changes, especially any policy statement granting tenancy-root-level permissions, since this is both rare in a well-designed tenancy and high-impact if unauthorized.
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