Script the Chrome Enterprise Core enrolment

Enrolling is what lifts the off-store restriction without joining a domain, and
it is one machine-scoped token in both places Chrome looks: HKLM on Windows, a
file under /etc/opt/chrome/policies/enrollment on Linux. Both scripts take
--remove, and both say plainly that removing the token locally does not release
the seat in the Admin console.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/enroll-chrome-management.ps1

@@ -0,0 +1,84 @@
+<#
+.SYNOPSIS
+    Enrol this machine's Chrome in Chrome Enterprise Core.
+
+.DESCRIPTION
+    Chrome refuses to force-install an extension from outside its own web store
+    unless the machine counts as enterprise managed. Enrolment is the way to
+    qualify without joining a domain: one machine-level token, and from the next
+    launch Chrome takes policy from the Google Admin console and the off-store
+    restriction lifts. install-extension-policy.ps1 then works as intended.
+
+    The token comes from the Admin console: Devices > Chrome > Managed browsers >
+    the enrollment-token button. One token can enrol any number of machines, and
+    it is only used at enrolment.
+
+    Needs an elevated PowerShell — the token is machine-scoped, and Chrome does
+    not read it from the user hive.
+
+.EXAMPLE
+    powershell -NoProfile -ExecutionPolicy Bypass -File scripts\enroll-chrome-management.ps1 -Token abcd1234-...
+#>
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory = $true, ParameterSetName = 'Enrol')]
+    [string]$Token,
+
+    # Refuse to start Chrome at all if enrolment fails. Sound on a fleet, risky
+    # on a trading PC: a revoked token would leave you with no browser.
+    [Parameter(ParameterSetName = 'Enrol')]
+    [switch]$Mandatory,
+
+    [Parameter(Mandatory = $true, ParameterSetName = 'Remove')]
+    [switch]$Remove
+)
+
+$ErrorActionPreference = 'Stop'
+
+$identity = [Security.Principal.WindowsIdentity]::GetCurrent()
+if (-not ([Security.Principal.WindowsPrincipal]$identity).IsInRole(
+        [Security.Principal.WindowsBuiltInRole]::Administrator)) {
+    throw 'Run this from an elevated PowerShell — the enrolment token is machine-level.'
+}
+
+$key = 'HKLM:\SOFTWARE\Policies\Google\Chrome'
+if (-not (Test-Path $key)) { New-Item -Path $key -Force | Out-Null }
+
+if ($Remove) {
+    foreach ($name in 'CloudManagementEnrollmentToken', 'CloudManagementEnrollmentMandatory') {
+        if ($null -ne (Get-ItemProperty -Path $key -Name $name -ErrorAction SilentlyContinue)) {
+            Remove-ItemProperty -Path $key -Name $name
+            Write-Host "Removed $name"
+        }
+    }
+    Write-Host @"
+
+Restart Chrome. Note this stops Chrome asking for policy, but does not undo the
+enrolment on Google's side — delete the browser from Devices > Chrome > Managed
+browsers as well, or it keeps a seat and shows as stale.
+"@
+    exit 0
+}
+
+New-ItemProperty -Path $key -Name 'CloudManagementEnrollmentToken' `
+    -Value $Token -PropertyType String -Force | Out-Null
+Write-Host "Wrote CloudManagementEnrollmentToken to $key"
+
+if ($Mandatory) {
+    New-ItemProperty -Path $key -Name 'CloudManagementEnrollmentMandatory' `
+        -Value 1 -PropertyType DWord -Force | Out-Null
+    Write-Host 'Enrolment is now mandatory — Chrome will not start unenrolled.'
+}
+
+Write-Host @"
+
+Next:
+  1. Restart Chrome completely (check Task Manager for stray chrome.exe).
+  2. chrome://policy should name the Admin console as a policy source, and
+     chrome://management should say the browser is managed.
+  3. The machine appears under Devices > Chrome > Managed browsers.
+  4. Then install the extension, which is no longer blocked:
+       powershell -NoProfile -ExecutionPolicy Bypass -File scripts\install-extension-policy.ps1 -Browser Chrome
+     Or skip that and force-install it from the Admin console instead, which
+     covers every enrolled machine at once.
+"@

scripts/enroll-chrome-management.sh

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+#!/usr/bin/env bash
+# Enrol this machine's Chrome in Chrome Enterprise Core.
+#
+# The Linux counterpart to enroll-chrome-management.ps1. Chrome reads the token
+# from a file under /etc at startup, so this needs root, and it applies to every
+# user on the machine.
+#
+#   sudo scripts/enroll-chrome-management.sh <token>
+#   sudo scripts/enroll-chrome-management.sh --remove
+#
+# Chrome only — Chromium builds have no cloud-management support, so a Chromium
+# install cannot be enrolled and stays subject to the off-store restriction.
+set -euo pipefail
+
+DIR=/etc/opt/chrome/policies/enrollment
+TOKEN_FILE="$DIR/CloudManagementEnrollmentToken"
+
+info() { printf '  %s\n' "$1"; }
+fail() { printf '\n\033[1;31mERROR: %s\033[0m\n' "$1" >&2; exit 1; }
+
+[ "$(id -u)" -eq 0 ] || fail "run this with sudo — the token lives under /etc"
+[ $# -ge 1 ] || fail "usage: $0 <enrollment-token> | --remove"
+
+if [ "$1" = "--remove" ]; then
+    rm -f "$TOKEN_FILE" "$DIR/CloudManagementEnrollmentOptions"
+    info "removed $TOKEN_FILE"
+    info "Restart Chrome. This stops it asking for policy, but does not undo the"
+    info "enrolment on Google's side — delete the browser from Devices > Chrome >"
+    info "Managed browsers too."
+    exit 0
+fi
+
+[ -d /etc/opt/chrome ] || fail "no /etc/opt/chrome — this is for Google Chrome, not Chromium"
+
+mkdir -p "$DIR"
+# The file must contain the token and nothing else: no quotes, no newline noise,
+# no filename extension. Chrome reads it verbatim.
+printf '%s' "$1" > "$TOKEN_FILE"
+chmod 644 "$TOKEN_FILE"
+info "wrote $TOKEN_FILE"
+
+echo
+info "Next:"
+info "  1. Restart Chrome completely."
+info "  2. chrome://policy should name the Admin console as a policy source, and"
+info "     chrome://management should say the browser is managed."
+info "  3. Then: sudo scripts/install-extension-policy.sh"