ci: workflows authorize Azure Storage with the federated identity, not SAS secrets (D-222)

Every storage write against autopilotmonitoreu -- build-counter CAS, agent ZIP and MSI,
version manifests, customer bootstrap scripts, the AdminConfiguration hash oracle -- now
rides on the existing federated credential (subject repo:.../ref:refs/heads/main) instead
of a long-lived SAS in repo secrets.

The REST calls themselves are unchanged: '?<sas>' became an Authorization header, so the
ETag-CAS of the counters, Content-MD5 and the no-cache contract survive verbatim. That is
also why this is not a rewrite onto 'az storage blob upload' -- it cannot express If-Match,
and two concurrent builds could then mint the same build number.

.github/scripts/Get-StorageAuthHeaders.ps1 is the single place that knows the resource id,
the az invocation and the service version. x-ms-version is mandatory for Entra-authorized
requests (>= 2017-11-09) and for any Table request without a SAS; 2021-08-06 was verified
live against both the blob and the table endpoint of this account.

azure/login added to build-agent, build-msi, publish-scripts (plus id-token: write) and
deploy-web; deploy-backend and deploy-mcp already had it. Publish-BootstrapScripts.ps1
-DryRun acquires NO token: the PR gate runs it without any Azure login, and that must
stay true.

The AdminConfiguration merge lost its "secret not configured" skip branch -- a failure
there now surfaces instead of silently leaving the hash oracle pointing at an older build.

AZURE_BLOB_AGENT_SAS_TOKEN, AZURE_BLOB_VERSIONS_SAS_TOKEN and AZURE_TABLE_ADMIN_SAS_TOKEN
are retired once the first runs are green. AZURE_BLOB_AGENT_LEGACY_SAS_TOKEN stays: that
account lives in the pre-migration tenant, where this principal has no identity -- it dies
with the mirror, not before.

Requires on the SP: Storage Blob Data Contributor on the containers 'agent' and 'versions',
Storage Table Data Contributor on the table 'AdminConfiguration'. Granted 2026-09-08.

.github/scripts/Get-StorageAuthHeaders.ps1

@@ -0,0 +1,51 @@
+<#
+.SYNOPSIS
+    Returns the request headers that authorize an Azure Storage REST call with Microsoft Entra.
+
+.DESCRIPTION
+    One place for the storage OAuth contract shared by every publisher in this repo -- the
+    agent ZIP and MSI, the customer bootstrap scripts, the version manifests and the build
+    counters. Resource id, the az invocation, the service version and the failure message
+    live here so they cannot drift between call sites.
+
+    Identity comes from whatever `az login` established: the federated GitHub OIDC principal
+    in CI (azure/login, subject repo:okieselbach/AutopilotMonitor:ref:refs/heads/main), the
+    operator's own account for the local build. No secret is read, stored or passed around.
+
+    x-ms-version is MANDATORY here, not decoration: Entra-authorized requests are rejected
+    below 2017-11-09, and Table requests without a SAS must carry the header at all. 2021-08-06
+    is old enough to be deployed in every region and new enough for everything we send.
+
+    Callers merge the result into their own headers -- `$auth + @{ ... }` yields a new
+    hashtable per request, so nothing is shared across uploads:
+
+        $auth = & "$PSScriptRoot/Get-StorageAuthHeaders.ps1"
+        Invoke-RestMethod -Uri $url -Method Put -Headers ($auth + @{ 'x-ms-blob-type' = 'BlockBlob' }) -Body $bytes
+
+    Acquire once per step and reuse: every call shells out to az (~1s) and the token is valid
+    for the lifetime of a job.
+
+.OUTPUTS
+    [hashtable] Authorization + x-ms-version.
+#>
+[CmdletBinding()]
+param()
+
+$ErrorActionPreference = 'Stop'
+
+# The data-plane resource, not management.azure.com -- a management token is accepted by
+# neither the blob nor the table endpoint.
+$token = az account get-access-token --resource https://storage.azure.com --query accessToken -o tsv 2>$null
+
+if ($LASTEXITCODE -ne 0 -or [string]::IsNullOrWhiteSpace($token)) {
+    throw ('Could not acquire an Azure Storage token. In CI this means the azure/login step ' +
+           'is missing or its federated credential does not cover this ref; locally, run ' +
+           '`az login`. A token alone is not enough: the principal also needs Storage Blob ' +
+           'Data Contributor on the container it writes, and Storage Table Data Contributor ' +
+           'on the table -- a missing role shows up later as HTTP 403 AuthorizationPermissionMismatch.')
+}
+
+return @{
+    'Authorization' = "Bearer $token"
+    'x-ms-version'  = '2021-08-06'
+}

.github/scripts/Publish-BootstrapScripts.ps1

@@ -31,14 +31,10 @@
          lose its agent fields) and AdminConfiguration.LatestBootstrapV2ScriptVersion.
       6. Verify through the alias -- re-download each blob and compare SHA-256.
 
-.PARAMETER SasToken
-    Container SAS for the eu storage account with write permission. Leading '?' tolerated.
-
 .PARAMETER LegacySasToken
     Container SAS for the legacy account. Optional -- a mirror failure warns, never fails.
-
-.PARAMETER TableSasToken
-    Table SAS for AdminConfiguration. Optional -- omitted or 'XXX' skips the oracle update.
+    The legacy account lives in a different tenant, so the ambient Entra identity cannot
+    reach it; this is the only credential the publisher still takes.
 
 .PARAMETER RepoRoot
     Repository root. Defaults to the parent of .github/scripts.
@@ -50,13 +46,11 @@
     ./Publish-BootstrapScripts.ps1 -DryRun
 
 .EXAMPLE
-    ./Publish-BootstrapScripts.ps1 -SasToken $env:SAS -TableSasToken $env:TABLE_SAS
+    ./Publish-BootstrapScripts.ps1 -LegacySasToken $env:LEGACY_SAS
 #>
 [CmdletBinding()]
 param(
-    [string]$SasToken,
     [string]$LegacySasToken,
-    [string]$TableSasToken,
     [string]$RepoRoot,
     [switch]$DryRun
 )
@@ -66,9 +60,6 @@ $ErrorActionPreference = 'Stop'
 if (-not $RepoRoot) {
     $RepoRoot = (Resolve-Path (Join-Path $PSScriptRoot '../..')).Path
 }
-if (-not $DryRun -and [string]::IsNullOrWhiteSpace($SasToken)) {
-    throw 'SasToken is required unless -DryRun is used.'
-}
 
 $ContainerUrl       = 'https://autopilotmonitoreu.blob.core.windows.net/agent'
 $LegacyContainerUrl = 'https://autopilotmonitor.blob.core.windows.net/agent'
@@ -218,7 +209,10 @@ foreach ($extra in $extraSources) {
 }
 
 $legacySas = if ($LegacySasToken) { $LegacySasToken.TrimStart('?') } else { '' }
-$writeSas  = if ($SasToken) { $SasToken.TrimStart('?') } else { '' }
+
+# Acquired lazily: a dry run must stay runnable without any Azure login -- the PR gate
+# (bootstrap-script-gates.yml) executes this script with -DryRun and never logs in.
+$authHeaders = if ($DryRun) { $null } else { & (Join-Path $PSScriptRoot 'Get-StorageAuthHeaders.ps1') }
 
 foreach ($item in $publishSet) {
     # Explicit type, not a convenience: an Object[] body is uploaded as space-separated
@@ -242,7 +236,7 @@ foreach ($item in $publishSet) {
     # fresh manifest would fail the bootstrap SHA check -- this keeps that class of bug
     # impossible even if caching is ever re-enabled.
     $headers = @{ 'x-ms-blob-type' = 'BlockBlob'; 'Content-Type' = $ScriptContentType; 'x-ms-blob-cache-control' = 'no-cache' }
-    Invoke-RestMethod -Uri "$ContainerUrl/$($item.BlobName)?$writeSas" -Method Put -Headers $headers -Body $bytes | Out-Null
+    Invoke-RestMethod -Uri "$ContainerUrl/$($item.BlobName)" -Method Put -Headers ($authHeaders + $headers) -Body $bytes | Out-Null
 
     # Read straight back from the blob (authoritative, no CDN in the way) before touching the
     # mirror or the next file. The alias verification at the end would catch a bad body too,
@@ -290,7 +284,7 @@ if (-not $DryRun) {
                 'x-ms-blob-cache-control' = 'no-cache'
                 'If-Match'                = $etag
             }
-            Invoke-RestMethod -Uri "$ContainerUrl/version.json?$writeSas" -Method Put -Headers $manifestHeaders -Body $body | Out-Null
+            Invoke-RestMethod -Uri "$ContainerUrl/version.json" -Method Put -Headers ($authHeaders + $manifestHeaders) -Body $body | Out-Null
             Write-Host "version.json bootstrapVersion -> $scriptVersion (agent fields untouched)"
 
             if ($legacySas) {
@@ -310,11 +304,8 @@ if (-not $DryRun) {
     }
 }
 
-$tableSas = if ($TableSasToken) { $TableSasToken.TrimStart('?') } else { '' }
 if ($DryRun) {
     Write-Host "  [dry-run] would set AdminConfiguration.LatestBootstrapV2ScriptVersion = $scriptVersion"
-} elseif ([string]::IsNullOrEmpty($tableSas) -or $tableSas -eq 'XXX') {
-    Write-Host 'SKIPPED: AdminConfiguration update -- set AZURE_TABLE_ADMIN_SAS_TOKEN to enable the portal version oracle'
 } else {
     $tableHeaders = @{
         'Content-Type' = 'application/json'
@@ -322,7 +313,7 @@ if ($DryRun) {
         'If-Match'     = '*'
     }
     $tableBody = @{ LatestBootstrapV2ScriptVersion = $scriptVersion } | ConvertTo-Json
-    Invoke-RestMethod -Uri "$TableUrl`?$tableSas" -Method Merge -Headers $tableHeaders -Body $tableBody | Out-Null
+    Invoke-RestMethod -Uri $TableUrl -Method Merge -Headers ($authHeaders + $tableHeaders) -Body $tableBody | Out-Null
     Write-Host "AdminConfiguration.LatestBootstrapV2ScriptVersion = $scriptVersion"
 }
 

.github/scripts/Request-BuildNumber.ps1

@@ -12,7 +12,8 @@
     A failed build burns a number, which is harmless -- uniqueness matters,
     density does not.
 
-    The blob is public-read; only the write needs the container SAS.
+    The blob is public-read; only the write needs authorization, and that comes from the
+    ambient Entra identity (see Get-StorageAuthHeaders.ps1) -- no secret is passed in.
 
     Why a counter and not the published version manifest: manifests are written
     on publish, not on build (the agent writes version.json only for stable
@@ -20,10 +21,7 @@
     overwrite each other's versioned artifact.
 
 .PARAMETER CounterUrl
-    Full URL of the counter blob, without SAS.
-
-.PARAMETER SasToken
-    Container SAS with create+write permission. A leading '?' is tolerated.
+    Full URL of the counter blob.
 
 .PARAMETER Override
     Explicit build number instead of counter+1. If it is not greater than the
@@ -37,20 +35,19 @@
     [int] the reserved build number. Progress goes to the host, not the pipeline.
 
 .EXAMPLE
-    $n = ./Request-BuildNumber.ps1 -CounterUrl $url -SasToken $sas
+    $n = ./Request-BuildNumber.ps1 -CounterUrl $url
 #>
 [CmdletBinding()]
 param(
     [Parameter(Mandatory = $true)][string]$CounterUrl,
-    [Parameter(Mandatory = $true)][string]$SasToken,
     [int]$Override = 0,
     [int]$MaxAttempts = 5
 )
 
 $ErrorActionPreference = 'Stop'
 
-# Tolerate both secret formats ("sp=cw&..." and "?sp=cw&...").
-$writeUrl = $CounterUrl + '?' + $SasToken.TrimStart('?')
+# The write is Entra-authorized; the read below stays anonymous (public container).
+$authHeaders = & (Join-Path $PSScriptRoot 'Get-StorageAuthHeaders.ps1')
 
 function Get-HttpStatus {
     param($ErrorRecord)
@@ -85,8 +82,8 @@ for ($attempt = 1; $attempt -le $MaxAttempts; $attempt++) {
     $target = if ($Override -gt 0) { $Override } else { $counter.Value + 1 }
 
     try {
-        $headers = @{ 'x-ms-blob-type' = 'BlockBlob'; 'If-Match' = $counter.ETag }
-        Invoke-RestMethod -Uri $writeUrl -Method Put -Headers $headers -Body "$target" -ContentType 'text/plain' | Out-Null
+        $headers = $authHeaders + @{ 'x-ms-blob-type' = 'BlockBlob'; 'If-Match' = $counter.ETag }
+        Invoke-RestMethod -Uri $CounterUrl -Method Put -Headers $headers -Body "$target" -ContentType 'text/plain' | Out-Null
         Write-Host "  Reserved build number $target (CAS write ok, attempt $attempt)"
         return $target
     } catch {

.github/workflows/build-agent.yml

@@ -67,6 +67,18 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v7
 
+      # Every storage write below (counter blob, agent ZIP, manifests, AdminConfiguration)
+      # is authorized by this federated identity -- no SAS secret. One login covers the whole
+      # job: the federated credential is bound to the ref, and a release run takes ~2 minutes,
+      # well inside the token lifetime. Only the legacy mirror still needs a SAS: that account
+      # lives in the pre-migration tenant, where this principal has no identity.
+      - name: Login to Azure (OIDC)
+        uses: azure/login@7ddb5af1ef8758cf1353cf3b42f940aee27ba21c # v3
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+
       # SDK 10 = single build toolchain (parity with local build.ps1 / global.json).
       - name: Setup .NET
         uses: actions/setup-dotnet@v6
@@ -85,7 +97,6 @@ jobs:
         # build_number could otherwise break out of the quotes and run arbitrary code.
         env:
           BUILD_NUMBER_OVERRIDE: ${{ inputs.build_number }}
-          AGENT_SAS_TOKEN: ${{ secrets.AZURE_BLOB_AGENT_SAS_TOKEN }}
         run: |
           $override = 0
           if ($env:BUILD_NUMBER_OVERRIDE -ne '') {
@@ -96,7 +107,7 @@ jobs:
           }
 
           $counterUrl = "https://autopilotmonitoreu.blob.core.windows.net/agent/buildcounter-v$($env:LINE_MAJOR).txt"
-          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl $counterUrl -SasToken $env:AGENT_SAS_TOKEN -Override $override
+          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl $counterUrl -Override $override
 
           $csproj = Get-Content $env:CSPROJ_PATH -Raw
           if ($csproj -match '<VersionPrefix>(\d+\.\d+)</VersionPrefix>') {
@@ -224,7 +235,7 @@ jobs:
         shell: pwsh
         run: |
           $containerUrl = "https://autopilotmonitoreu.blob.core.windows.net/agent"
-          $sasToken = "${{ secrets.AZURE_BLOB_AGENT_SAS_TOKEN }}".TrimStart('?')
+          $authHeaders = & ./.github/scripts/Get-StorageAuthHeaders.ps1
           # Legacy mirror (transition until customers moved to the download.-alias):
           # blobs are ALSO pushed to the old account so the bootstrap URL baked into
           # customers' Intune scripts keeps serving current bits. Fail-soft -- a
@@ -234,7 +245,6 @@ jobs:
 
           function Send-Blob {
             param([string]$Local, [string]$BlobName, [string]$ContentType)
-            $url = "$containerUrl/$BlobName`?$sasToken"
             $bytes = [System.IO.File]::ReadAllBytes($Local)
             # no-cache on EVERY blob: they all rotate in place (even the per-line ZIP is
             # overwritten each build), and the download alias fronts them with Front Door.
@@ -248,7 +258,7 @@ jobs:
               $md5.Dispose()
             }
             Write-Host "Uploading $BlobName ($([math]::Round($bytes.Length / 1MB, 2)) MB)..."
-            Invoke-RestMethod -Uri $url -Method Put -Headers $headers -Body $bytes
+            Invoke-RestMethod -Uri "$containerUrl/$BlobName" -Method Put -Headers ($authHeaders + $headers) -Body $bytes
             Write-Host "  uploaded $BlobName"
             if (-not [string]::IsNullOrEmpty($legacySasToken)) {
               try {
@@ -275,35 +285,30 @@ jobs:
             # (dev render, version-bump guard, bootstrapVersion oracles, alias verification).
             # Runs AFTER version.json so its bootstrapVersion read sees this build's manifest.
             ./.github/scripts/Publish-BootstrapScripts.ps1 `
-              -SasToken '${{ secrets.AZURE_BLOB_AGENT_SAS_TOKEN }}' `
-              -LegacySasToken '${{ secrets.AZURE_BLOB_AGENT_LEGACY_SAS_TOKEN }}' `
-              -TableSasToken '${{ secrets.AZURE_TABLE_ADMIN_SAS_TOKEN }}'
+              -LegacySasToken '${{ secrets.AZURE_BLOB_AGENT_LEGACY_SAS_TOKEN }}'
           }
 
           # Update AdminConfiguration LatestAgentV2* -- ONLY on stable cutover. The hash-oracle
           # must never point at a build that is not actually in the stable namespace.
           # LatestBootstrapV2ScriptVersion is NOT set here: it belongs to the script publisher
           # above, which also owns it on script-only pushes. One writer per field.
-          $tableSasToken = "${{ secrets.AZURE_TABLE_ADMIN_SAS_TOKEN }}".TrimStart('?')
           if ('${{ inputs.publish_as_stable }}' -ne 'true') {
             Write-Host "SKIPPED: AdminConfiguration update (versioned-only run -- stable namespace unchanged)"
-          } elseif ([string]::IsNullOrEmpty($tableSasToken) -or $tableSasToken -eq "XXX") {
-            Write-Host "SKIPPED: Table SAS token not configured -- set AZURE_TABLE_ADMIN_SAS_TOKEN secret to enable backend hash-oracle"
           } else {
             $sha256 = "${{ steps.artifact.outputs.sha256 }}"
             $exeSha256 = "${{ steps.artifact.outputs.exe_sha256 }}"
             $agentVersion = "${{ steps.version.outputs.version }}"
-            $tableUrl = "https://autopilotmonitoreu.table.core.windows.net/AdminConfiguration(PartitionKey='GlobalConfig',RowKey='config')?$tableSasToken"
+            $tableUrl = "https://autopilotmonitoreu.table.core.windows.net/AdminConfiguration(PartitionKey='GlobalConfig',RowKey='config')"
             $tableBody = @{
               LatestAgentV2Version    = $agentVersion
               LatestAgentV2Sha256     = $sha256
               LatestAgentV2ExeSha256  = $exeSha256
             }
-            Invoke-RestMethod -Uri $tableUrl -Method Merge -Headers @{
+            Invoke-RestMethod -Uri $tableUrl -Method Merge -Headers ($authHeaders + @{
               "Content-Type" = "application/json"
               "Accept"       = "application/json;odata=nometadata"
               "If-Match"     = "*"
-            } -Body ($tableBody | ConvertTo-Json)
+            }) -Body ($tableBody | ConvertTo-Json)
             Write-Host "AdminConfiguration updated: V2 version=$agentVersion, sha256=$sha256, exeSha256=$exeSha256"
           }
 

.github/workflows/build-msi.yml

@@ -62,6 +62,14 @@ jobs:
           Write-Host "MSI version (from Package.wxs): $version"
           "version=$version" >> $env:GITHUB_OUTPUT
 
+      # The blob upload below is authorized by this federated identity, not by a SAS.
+      - name: Login to Azure (OIDC)
+        uses: azure/login@7ddb5af1ef8758cf1353cf3b42f940aee27ba21c # v3
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+
       - name: Install WiX toolset
         run: dotnet tool install --global wix --version "5.*"
 
@@ -84,7 +92,7 @@ jobs:
         shell: pwsh
         run: |
           $containerUrl = "https://autopilotmonitoreu.blob.core.windows.net/agent"
-          $sasToken = "${{ secrets.AZURE_BLOB_AGENT_SAS_TOKEN }}".TrimStart('?')
+          $authHeaders = & ./.github/scripts/Get-StorageAuthHeaders.ps1
           $version = "${{ steps.version.outputs.version }}"
 
           # Same Send-Blob contract as build-agent.yml: no-cache on every blob because the
@@ -102,7 +110,7 @@ jobs:
             $headers["Content-MD5"] = [Convert]::ToBase64String($md5.ComputeHash($bytes))
             $md5.Dispose()
             Write-Host "Uploading $BlobName ($([math]::Round($bytes.Length / 1KB)) KB)..."
-            Invoke-RestMethod -Uri "$containerUrl/$BlobName`?$sasToken" -Method Put -Headers $headers -Body $bytes
+            Invoke-RestMethod -Uri "$containerUrl/$BlobName" -Method Put -Headers ($authHeaders + $headers) -Body $bytes
             Write-Host "  uploaded $BlobName"
           }
 

.github/workflows/deploy-backend.yml

@@ -41,7 +41,7 @@ jobs:
         id: version
         shell: pwsh
         run: |
-          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl "${{ env.VERSIONS_CONTAINER }}/backend.txt" -SasToken '${{ secrets.AZURE_BLOB_VERSIONS_SAS_TOKEN }}'
+          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl "${{ env.VERSIONS_CONTAINER }}/backend.txt"
 
           $csproj = Get-Content ${{ env.CSPROJ_PATH }} -Raw
           if ($csproj -notmatch '<VersionPrefix>(\d+\.\d+)</VersionPrefix>') {
@@ -115,9 +115,9 @@ jobs:
             runId       = '${{ github.run_id }}'
           } | ConvertTo-Json
 
-          $sas = '${{ secrets.AZURE_BLOB_VERSIONS_SAS_TOKEN }}'.TrimStart('?')
-          $url = "${{ env.VERSIONS_CONTAINER }}/backend.json?$sas"
+          $authHeaders = & ./.github/scripts/Get-StorageAuthHeaders.ps1
+          $url = "${{ env.VERSIONS_CONTAINER }}/backend.json"
           # no-cache: rotating pointer, must never be served stale by any fronting cache.
-          Invoke-RestMethod -Uri $url -Method Put -Headers @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' } -Body $manifest -ContentType 'application/json' | Out-Null
+          Invoke-RestMethod -Uri $url -Method Put -Headers ($authHeaders + @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' }) -Body $manifest -ContentType 'application/json' | Out-Null
           Write-Host "Published versions/backend.json"
           Write-Host $manifest

.github/workflows/deploy-mcp.yml

@@ -59,7 +59,7 @@ jobs:
         id: version
         shell: pwsh
         run: |
-          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl "${{ env.VERSIONS_CONTAINER }}/mcp.txt" -SasToken '${{ secrets.AZURE_BLOB_VERSIONS_SAS_TOKEN }}'
+          $buildNumber = & ./.github/scripts/Request-BuildNumber.ps1 -CounterUrl "${{ env.VERSIONS_CONTAINER }}/mcp.txt"
 
           $pkgVersion = (Get-Content ${{ env.PACKAGE_JSON }} -Raw | ConvertFrom-Json).version
           $prefix = ($pkgVersion -split '\.')[0..1] -join '.'
@@ -144,9 +144,9 @@ jobs:
             docsCommit  = '${{ steps.docs.outputs.sha }}'.Substring(0, 7)
           } | ConvertTo-Json
 
-          $sas = '${{ secrets.AZURE_BLOB_VERSIONS_SAS_TOKEN }}'.TrimStart('?')
-          $url = "${{ env.VERSIONS_CONTAINER }}/mcp.json?$sas"
+          $authHeaders = & ./.github/scripts/Get-StorageAuthHeaders.ps1
+          $url = "${{ env.VERSIONS_CONTAINER }}/mcp.json"
           # no-cache: rotating pointer, must never be served stale by any fronting cache.
-          Invoke-RestMethod -Uri $url -Method Put -Headers @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' } -Body $manifest -ContentType 'application/json' | Out-Null
+          Invoke-RestMethod -Uri $url -Method Put -Headers ($authHeaders + @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' }) -Body $manifest -ContentType 'application/json' | Out-Null
           Write-Host "Published versions/mcp.json"
           Write-Host $manifest

.github/workflows/deploy-web.yml

@@ -40,6 +40,15 @@ jobs:
           lfs: false
           fetch-depth: 0  # Full history needed for git-based sitemap lastmod dates
 
+      # Only the version manifest at the very end needs Azure; logging in here rather than
+      # next to that step keeps a credential problem from surfacing after a live deploy.
+      - name: Login to Azure (OIDC)
+        uses: azure/login@7ddb5af1ef8758cf1353cf3b42f940aee27ba21c # v3
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+
       # The customer docs repo is the single source of the "What's new" panel: the prebuild
       # step (scripts/whats-new/build-whats-new.js) turns changelog/*.md into
       # public/whats-new.json and dates every bullet via git blame — hence the full history.
@@ -169,9 +178,9 @@ jobs:
             docsCommit  = '${{ steps.docs.outputs.sha }}'.Substring(0, 7)
           } | ConvertTo-Json
 
-          $sas = '${{ secrets.AZURE_BLOB_VERSIONS_SAS_TOKEN }}'.TrimStart('?')
-          $url = "${{ env.VERSIONS_CONTAINER }}/web.json?$sas"
+          $authHeaders = & ./.github/scripts/Get-StorageAuthHeaders.ps1
+          $url = "${{ env.VERSIONS_CONTAINER }}/web.json"
           # no-cache: rotating pointer, must never be served stale by any fronting cache.
-          Invoke-RestMethod -Uri $url -Method Put -Headers @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' } -Body $manifest -ContentType 'application/json' | Out-Null
+          Invoke-RestMethod -Uri $url -Method Put -Headers ($authHeaders + @{ 'x-ms-blob-type' = 'BlockBlob'; 'x-ms-blob-cache-control' = 'no-cache' }) -Body $manifest -ContentType 'application/json' | Out-Null
           Write-Host "Published versions/web.json"
           Write-Host $manifest

.github/workflows/publish-scripts.yml

@@ -26,6 +26,7 @@ on:
 
 permissions:
   contents: read
+  id-token: write   # OIDC federated login for the storage writes (secret-less)
 
 # Shared with build-agent.yml: a script publish and an agent release both touch
 # version.json, and the bootstrapVersion read-modify-write must not interleave with the
@@ -45,12 +46,20 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
+      # Authorizes the eu blob writes and the AdminConfiguration merge. The gates job above
+      # runs the same publisher with -DryRun and deliberately without a login -- a dry run
+      # must never need Azure credentials.
+      - name: Login to Azure (OIDC)
+        uses: azure/login@7ddb5af1ef8758cf1353cf3b42f940aee27ba21c # v3
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+
       - name: Publish bootstrap + customer scripts
         shell: pwsh
         run: |
           $dryRun = '${{ inputs.dry_run }}' -eq 'true'
           ./.github/scripts/Publish-BootstrapScripts.ps1 `
-            -SasToken '${{ secrets.AZURE_BLOB_AGENT_SAS_TOKEN }}' `
             -LegacySasToken '${{ secrets.AZURE_BLOB_AGENT_LEGACY_SAS_TOKEN }}' `
-            -TableSasToken '${{ secrets.AZURE_TABLE_ADMIN_SAS_TOKEN }}' `
             -DryRun:$dryRun