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Bump the Win MDM cert skew to 1-day - #52709
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The 10-minute allowance from #52620 is the AD CS norm, but it assumes domain-grade time discipline. Fleet enrolls workgroup, Entra-joined and BYOD hosts, where a clock trailing the server by hours is realistic (dual-boot RTC read as local time, restored VM snapshots, hardware that has not reached NTP yet). Such a host rejects a freshly issued certificate as not yet valid, surfacing as an opaque enrollment failure. Widening costs nothing now that NotAfter is derived from the issuance time rather than from NotBefore, so neither expiry nor the renewal window moves.
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🟢 Approval recommended
The change is small and scoped, and the remaining feedback is limited to minor test/message maintainability and a comment grammar fix.
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Pull request overview
Adjusts Windows MDM WSTEP client certificate issuance to allow a larger clock-skew window by backdating the certificate NotBefore by 1 day, aligning with the intention in #52601 to avoid excessive backdating while tolerating real-world client clock drift.
Changes:
- Introduced
clientCertClockSkewAllowance(24h) and used it to computeNotBeforefor issued client certs. - Updated the
populateClientCertvalidity test to assertNotBeforematches the new skew allowance and added a guard assertion around the skew window.
File summaries
| File | Description |
|---|---|
| server/mdm/microsoft/wstep.go | Introduces 1-day clock-skew allowance constant and applies it to client cert NotBefore. |
| server/mdm/microsoft/wstep_test.go | Updates validity tests to match the new skew allowance and adds an additional guard assertion. |
Review details
Files excluded by content exclusion policy (1)
- changes/52601-windows-mdm-client-cert-validity
- Files reviewed: 2/3 changed files
- Comments generated: 2
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #52709 +/- ##
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+ Coverage 68.82% 75.95% +7.12%
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Files 4105 4105
Lines 248243 248243
Branches 14190 14190
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+ Hits 170864 188553 +17689
+ Misses 77203 59514 -17689
Partials 176 176
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughWindows MDM client certificates now use a named 24-hour Priority: ➖ Normal — Schedule the Windows MDM certificate clock-skew update because it addresses medium-severity certificate lifetime and renewal behavior with targeted code, tests, and documentation changes. Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to Windows MDM client certificates now allow a 24-hour NotBefore clock-skew window, with test coverage asserting the intended duration and certificate date behavior. No merge-blocking current-head risk is identified. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR addresses the clock-skew portion of issue Resolution Implement the remaining certificate-validity and provisioning-period changes, or update the linked issue and PR scope to explicitly track those requirements separately. Do not assume other work satisfies them without evidence in this review context.
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Actionable comments posted: 1
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Inline comments:
In `@server/mdm/microsoft/wstep_test.go`:
- Line 399: Update the assertion for clientCertClockSkewAllowance in the
relevant test to require exact equality with 24*time.Hour, replacing the current
upper-bound check while preserving the existing failure message or equivalent
context.
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Restore the sentence dropped from the constant's comment, and pin the allowance to exactly one day instead of bounding it below an arbitrary seven. The bound's failure message claimed it guarded against the renewal period while comparing against an unrelated number; an equality assertion pins the value the changes entry promises and drops the misleading wording.
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Approved. but please see the CI failing test |
Related issue: Resolves #52601
A community PR dropped it to 10 minutes. I'm changing it to 1 day.
Checklist for submitter
changes/,orbit/changes/oree/fleetd-chrome/changes.Testing
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