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VM run: `powercfg /hibernate on` writes to stderr where hibernation is unsupported (VMs), which under ErrorActionPreference=Stop aborted module G after its earlier lock-screen settings applied. Wrap it so the module completes cleanly. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
35 lines
2.0 KiB
PowerShell
35 lines
2.0 KiB
PowerShell
#Requires -Version 5.1
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<# SilverMetal Enhanced - Windows | Domain G: Physical & lock-screen hygiene
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Theft is threat #1 for a pocket device. Short auto-lock, PIN on wake, block
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DMA while locked, prefer hibernate, no HW kill switch (software cam/mic).
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Spec: ../hardening-spec.md (G) | SCAFFOLD (M1).
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#>
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[CmdletBinding()] param()
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Set-StrictMode -Version Latest; $ErrorActionPreference = 'Stop'
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Write-Host '[G] Physical & lock-screen hygiene'
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# Auto-lock: machine inactivity limit (seconds) + require password on wake.
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$sys = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System'
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New-Item $sys -Force | Out-Null
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Set-ItemProperty $sys -Name InactivityTimeoutSecs -Type DWord -Value 120 # lock after 2 min idle
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$pol = 'HKLM:\SOFTWARE\Policies\Microsoft\Power\PowerSettings\0e796bdb-100d-47d6-a2d5-f7d2daa51f51'
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New-Item $pol -Force | Out-Null
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Set-ItemProperty $pol -Name ACSettingIndex -Type DWord -Value 1 # require password on wake (AC)
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Set-ItemProperty $pol -Name DCSettingIndex -Type DWord -Value 1 # ... and on battery
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# Block new DMA-capable devices while the screen is locked (compensates if firmware
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# Kernel DMA Protection is absent - see Domain D / open question §8).
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$fve = 'HKLM:\SOFTWARE\Policies\Microsoft\FVE'
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New-Item $fve -Force | Out-Null
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Set-ItemProperty $fve -Name DisableExternalDMAUnderLock -Type DWord -Value 1
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# Prefer hibernate over sleep (keys not left resident in RAM as long).
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# Tolerate environments without hibernation support (e.g. VMs) -- native stderr
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# under ErrorActionPreference=Stop would otherwise abort the module.
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try { & powercfg /hibernate on 2>&1 | Out-Null } catch { Write-Host ' (hibernate unavailable here; skipped)' }
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# TODO-M1: set lid-close + idle -> hibernate via powercfg; deny camera/mic per-app
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# (Device Manager disable is the stopgap; the Pocket 4 has NO hardware kill switch).
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# NOTE: SilverDuress (Stack, v1.1) provides duress-PIN / panic-wipe - installed by module 08.
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Write-Host ' [G] auto-lock=120s, password-on-wake, DMA-blocked-while-locked, hibernate on.'
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