FreeBSD 15 sudo Fails Due to Incorrect File Permissions

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

Privilege escalation is blocked, disrupting automation and emergency operations.

Environment & Reproduction

Can happen after manual edits or improper config management templates.

sudo -l

Root Cause Analysis

sudo enforces strict ownership and mode checks on policy files.

Quick Triage

Check file owner and permissions for sudoers and include directories.

ls -l /usr/local/etc/sudoers*

Step-by-Step Diagnosis

Validate syntax and include chain while in root shell.

visudo -c

Solution – Primary Fix

Restore secure ownership/modes and correct configuration syntax.

sudo chown root:wheel /usr/local/etc/sudoers && sudo chmod 0440 /usr/local/etc/sudoers && sudo visudo -c

Solution – Alternative Approaches

Use doas as temporary control path until sudo policy is repaired.

Verification & Acceptance Criteria

sudo -l and privileged commands execute without policy warnings.

Rollback Plan

Reapply last known-good sudoers backup and test from console session.

Prevention & Hardening

Manage sudo policy via audited templates and permission checks.

Related Errors & Cross-Refs

Related to malformed include files and invalid alias definitions.

Related tutorial: View the step-by-step tutorial for freebsd-15.

View all freebsd-15 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

sudoers manual and FreeBSD privilege management guidance.