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security: verify downloaded update signatures before install (#3377) - #3566
jhaabhijeet864 wants to merge 2 commits into
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info
📜 Recent review details
WalkthroughThe update handler now checks downloaded update files on Windows for a valid Authenticode signature. If the path is missing or verification fails, it dispatches an error instead of continuing the downloaded-update flow. On verification failure, it attempts to remove the file. Tests cover Windows and non-Windows behavior. ChangesWindows update verification
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~12 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant autoUpdater
participant setupUpdates
participant PowerShell
participant filesystem
participant dispatch
autoUpdater->>setupUpdates: emit update-downloaded with downloadedFile
setupUpdates->>PowerShell: verify Authenticode signature
PowerShell-->>setupUpdates: return signature status
alt status is Valid
setupUpdates->>dispatch: dispatch downloaded action
else path missing or verification fails
setupUpdates->>filesystem: attempt to remove file after verification failure
setupUpdates->>dispatch: dispatch error action
end
Suggested labels: Suggested reviewers: Merge Risk: ⚪ Minimal · up to The platform-dependent test failure has been fixed, and normal Windows update events provide the path needed for signature verification. No identified issue blocks merging. Pre-merge checks |
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The title clearly and concisely describes the main change: verifying downloaded update signatures before installation. |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2… |
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @src/updates/main.ts:
- Around line 649-690: Update the integrity-check flow guarded by downloadedFile
so a missing or empty path on Windows is treated as a verification failure
rather than skipping verification; preserve the existing failure handling that
dispatches an update error and prevents installation.
- Around line 670-674: Update the Windows signature check in the visible
verification flow to trim stdout and require an exact match with the valid
status, rather than accepting any output containing it; also verify the signer
against the expected publisher identity before allowing the installer to pass.
Review comments at @src/updates/main/setupUpdates.main.spec.ts:
- Around line 272-318: Make the “update signature verification” tests
platform-independent by stubbing process.platform to win32 in beforeEach and
restoring its original property descriptor in afterEach. Add a non-Windows case
that confirms signature verification is skipped.
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f975c90b-41bf-42f5-825c-a1ef2817b111
📒 Files selected for processing (2)
src/updates/main.tssrc/updates/main/setupUpdates.main.spec.ts
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Source excerpt: Write all new code in TypeScript strict mode, unless the request says otherwise.
📄 CodeRabbit inference engine (AGENTS.md)
Files:
src/updates/main.tssrc/updates/main/setupUpdates.main.spec.ts
🪛 ast-grep (0.45.3)
src/updates/main.ts
[warning] 1-1: Importing child_process exposes a command-execution surface; ensure any command/argument built from input is validated, and prefer execFile/spawn with an argument array over exec.
Context: import { execFile } from 'child_process';
Note: [CWE-78] Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection').
(detect-child-process-typescript)
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Hi @jhaabhijeet864, thank you for looking into update integrity! This review found a real gap. electron-updater already verifies the signature of NSIS updates, but only when Could you change this PR to restore
We can help you find the correct certificate subject for the value. Thanks! |
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Much Appreciated @jeanfbrito ! 🫡 Honestly, this is exactly the kind of 'best code is no code' solution I was aiming for earlier. Relying on electron-updater's native pinning and avoiding the PowerShell/AppLocker edge cases seems the right call. I missed that publisherName got dropped in the v26 upgrade. I'll revert the custom PowerShell implementation right away. If you can share the exact certificate subject/publisher name, I'll plug it into electron-builder.json and push the updated commits! |
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3 participants
Ref #3377, split from #3563.
Verifies downloaded update installer Authenticode signatures on Windows before triggering
quitAndInstall()(RFC #3377 Part B):Get-AuthenticodeSignatureviaexecFilewith-NoProfileand-NonInteractive.stdout.trim() === 'Valid'before proceeding.downloadedFileis missing or verification fails, deletes the installer (fs.unlinkSync), dispatches an update error, and halts installation.process.platform === 'win32'); non-Windows platforms proceed directly to install.Verification
yarn test src/updates/main/setupUpdates.main.spec.ts: 12/12 passed (including Windows valid, tampered, missing file, and non-Windows skip cases)yarn lint: 0 errorsyarn build: 29 chunks scanned and passedScope & Risk
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