Refuse archive restore paths outside the selected target directory
A crafted backup path can escape the restore root. Validate resolved destinations before creating files.
- Focused work estimate
- 2h 30m + prerequisites
- Priority in the scenario
- High
- Engineering practice
- Filesystem · Security
Estimated field mix
- Security60%
- Storage systems40%
Field percentages are editorial estimates of the ticket's engineering focus. They total 100%; they are not measured time, proficiency scores, or ownership evidence.
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Project context
Fictional archive Alder backs up synthetic document metadata and generated blobs into a dedicated local directory. No real organizational data or cloud accounts are required.
Setup prerequisites
- Create synthetic metadata and generated blob fixtures.
- Provide isolated source backup and restore directories.
Preceding work
Complete these dependencies, or supply their agreed outputs before taking this ticket.
- CBACK-101 · Define archive backup manifests with explicit format versions
- CBACK-102 · Exclude temporary archive uploads from backup inventories
- CBACK-103 · Verify archive backup bytes against manifest digests
- CBACK-104 · Capture archive metadata and blob references at one snapshot boundary
- CBACK-105 · Resume archive backup copying without accepting stale partial files
- CBACK-106 · Finalize archive backups with an explicit complete marker
Acceptance criteria
- Traversal and absolute paths fail
- Symlink escape is rejected by adapter policy
- Valid files remain inside target
Implementation constraints
- Use a dedicated empty fixture directory.
Verification to include
- Restore valid nested object
- Attempt parent traversal or symlink escape
Deliverables
- Restore-path boundary and cases
Rollout and recovery
Abort restore before writes if containment cannot be established.
Value of the work
For the engineer: Practice consistent snapshots and recoverable restoration.
For the team: Inspect whether backup success can be substantiated by a usable restore.
Evidence boundaries
Outcome Evidence: Tests, patches, and runbooks are requested deliverables. They become Outcome Evidence only through a qualified Mission and immutable Evidence IDs.
Ownership Evidence: Independent adaptation must be observed under a declared verification policy and cite immutable Evidence IDs. Completing a planning ticket establishes no Ownership Evidence.