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Merge pull request #636 from KelvinTegelaar/dev
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‎Modules/CIPPCore/Public/GraphHelper/New-CIPPAzServiceSAS.ps1‎

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function New-CIPPAzServiceSAS {
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[CmdletBinding()] param(
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[Parameter(Mandatory = $true)] [string] $AccountName,
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[Parameter(Mandatory = $true)] [string] $AccountKey,
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[Parameter(Mandatory = $true)] [ValidateSet('blob', 'queue', 'file', 'table')] [string] $Service,
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[Parameter(Mandatory = $true)] [string] $ResourcePath,
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[Parameter(Mandatory = $true)] [string] $Permissions,
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[Parameter(Mandatory = $false)] [DateTime] $StartTime,
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[Parameter(Mandatory = $true)] [DateTime] $ExpiryTime,
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[Parameter(Mandatory = $false)] [ValidateSet('http', 'https', 'https,http')] [string] $Protocol = 'https',
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[Parameter(Mandatory = $false)] [string] $IP,
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[Parameter(Mandatory = $false)] [string] $SignedIdentifier,
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[Parameter(Mandatory = $false)] [string] $Version = '2022-11-02',
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[Parameter(Mandatory = $false)] [ValidateSet('b', 'c', 'd', 'bv', 'bs', 'f', 's')] [string] $SignedResource,
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[Parameter(Mandatory = $false)] [int] $DirectoryDepth,
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[Parameter(Mandatory = $false)] [string] $SnapshotTime,
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# Optional response header overrides (Blob/Files)
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[Parameter(Mandatory = $false)] [string] $CacheControl,
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[Parameter(Mandatory = $false)] [string] $ContentDisposition,
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[Parameter(Mandatory = $false)] [string] $ContentEncoding,
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[Parameter(Mandatory = $false)] [string] $ContentLanguage,
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[Parameter(Mandatory = $false)] [string] $ContentType,
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# Optional encryption scope (Blob, 2020-12-06+)
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[Parameter(Mandatory = $false)] [string] $EncryptionScope,
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# Optional connection string for endpoint/emulator support
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[Parameter(Mandatory = $false)] [string] $ConnectionString = $env:AzureWebJobsStorage
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)
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# Local helpers: canonicalized resource and signature (standalone)
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function _GetCanonicalizedResource {
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param(
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[Parameter(Mandatory = $true)][string] $AccountName,
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[Parameter(Mandatory = $true)][ValidateSet('blob', 'queue', 'file', 'table')] [string] $Service,
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[Parameter(Mandatory = $true)][string] $ResourcePath
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)
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$decodedPath = [System.Web.HttpUtility]::UrlDecode(($ResourcePath.TrimStart('/')))
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switch ($Service) {
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'blob' { return "/blob/$AccountName/$decodedPath" }
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'queue' { return "/queue/$AccountName/$decodedPath" }
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'file' { return "/file/$AccountName/$decodedPath" }
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'table' { return "/table/$AccountName/$decodedPath" }
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}
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}
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function _NewSharedKeySignature {
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param(
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[Parameter(Mandatory = $true)][string] $AccountKey,
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[Parameter(Mandatory = $true)][string] $StringToSign
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)
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$keyBytes = [Convert]::FromBase64String($AccountKey)
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$hmac = [System.Security.Cryptography.HMACSHA256]::new($keyBytes)
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try {
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$bytes = [System.Text.Encoding]::UTF8.GetBytes($StringToSign)
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$sig = $hmac.ComputeHash($bytes)
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return [Convert]::ToBase64String($sig)
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} finally { $hmac.Dispose() }
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}
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# Parse connection string for emulator/provided endpoints
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$ProvidedEndpoint = $null
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$ProvidedPath = $null
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$EmulatorHost = $null
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$EndpointSuffix = 'core.windows.net'
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if ($ConnectionString) {
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$conn = @{}
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foreach ($part in ($ConnectionString -split ';')) {
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$p = $part.Trim()
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if ($p -and $p -match '^(.+?)=(.+)$') { $conn[$matches[1]] = $matches[2] }
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}
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if ($conn['EndpointSuffix']) { $EndpointSuffix = $conn['EndpointSuffix'] }
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$ServiceCapitalized = [char]::ToUpper($Service[0]) + $Service.Substring(1)
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$EndpointKey = "${ServiceCapitalized}Endpoint"
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if ($conn[$EndpointKey]) {
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$ProvidedEndpoint = $conn[$EndpointKey]
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$ep = [Uri]::new($ProvidedEndpoint)
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$Protocol = $ep.Scheme
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$EmulatorHost = $ep.Host
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if ($ep.Port -ne -1) { $EmulatorHost = "$($ep.Host):$($ep.Port)" }
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$ProvidedPath = $ep.AbsolutePath.TrimEnd('/')
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} elseif ($conn['UseDevelopmentStorage'] -eq 'true') {
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# Emulator defaults
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if (-not $AccountName) { $AccountName = 'devstoreaccount1' }
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if (-not $AccountKey) { $AccountKey = 'Eby8vdM02xNOcqFlqUwJPLlmEtlCDXJ1OUzFT50uSRZ6IFsuFq2UVErCz4I6tq/K1SZFPTOtr/KBHBeksoGMGw==' }
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$Protocol = 'http'
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$ports = @{ blob = 10000; queue = 10001; table = 10002 }
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$EmulatorHost = "127.0.0.1:$($ports[$Service])"
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}
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}
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# Build the resource URI
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if ($ResourcePath.StartsWith('/')) { $ResourcePath = $ResourcePath.TrimStart('/') }
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$UriBuilder = [System.UriBuilder]::new()
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$UriBuilder.Scheme = $Protocol
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if ($ProvidedEndpoint) {
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# Use provided endpoint + its base path
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if ($EmulatorHost -match '^(.+?):(\d+)$') { $UriBuilder.Host = $matches[1]; $UriBuilder.Port = [int]$matches[2] }
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else { $UriBuilder.Host = $EmulatorHost }
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$UriBuilder.Path = ("$ProvidedPath/$ResourcePath").Replace('//', '/')
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} elseif ($EmulatorHost) {
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# Emulator: include account name in path
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if ($EmulatorHost -match '^(.+?):(\d+)$') { $UriBuilder.Host = $matches[1]; $UriBuilder.Port = [int]$matches[2] }
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else { $UriBuilder.Host = $EmulatorHost }
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$UriBuilder.Path = "$AccountName/$ResourcePath"
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} else {
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# Standard Azure endpoint
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$UriBuilder.Host = "$AccountName.$Service.$EndpointSuffix"
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$UriBuilder.Path = $ResourcePath
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}
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$uri = $UriBuilder.Uri
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# Canonicalized resource for SAS string-to-sign (service-name style, 2015-02-21+)
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$canonicalizedResource = _GetCanonicalizedResource -AccountName $AccountName -Service $Service -ResourcePath $ResourcePath
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# Time formatting per SAS spec (ISO 8601 UTC)
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function _FormatSasTime($dt) {
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if ($null -eq $dt) { return '' }
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if ($dt -is [string]) {
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if ([string]::IsNullOrWhiteSpace($dt)) { return '' }
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$parsed = [DateTime]::Parse($dt, [System.Globalization.CultureInfo]::InvariantCulture, [System.Globalization.DateTimeStyles]::AssumeUniversal)
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$utc = $parsed.ToUniversalTime()
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return $utc.ToString('yyyy-MM-ddTHH:mm:ssZ')
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}
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if ($dt -is [DateTime]) {
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$utc = ([DateTime]$dt).ToUniversalTime()
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return $utc.ToString('yyyy-MM-ddTHH:mm:ssZ')
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}
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return ''
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}
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$st = _FormatSasTime $StartTime
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$se = _FormatSasTime $ExpiryTime
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if ([string]::IsNullOrEmpty($se)) { throw 'ExpiryTime is required for SAS generation.' }
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# Assemble query parameters (service-specific)
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$q = @{}
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$q['sp'] = $Permissions
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if ($st) { $q['st'] = $st }
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$q['se'] = $se
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if ($IP) { $q['sip'] = $IP }
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if ($Protocol) { $q['spr'] = $Protocol }
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if ($Version) { $q['sv'] = $Version }
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if ($SignedIdentifier) { $q['si'] = $SignedIdentifier }
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# Blob/Files response headers overrides
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if ($CacheControl) { $q['rscc'] = $CacheControl }
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if ($ContentDisposition) { $q['rscd'] = $ContentDisposition }
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if ($ContentEncoding) { $q['rsce'] = $ContentEncoding }
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if ($ContentLanguage) { $q['rscl'] = $ContentLanguage }
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if ($ContentType) { $q['rsct'] = $ContentType }
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# Resource-type specifics
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$includeEncryptionScope = $false
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if ($Service -eq 'blob') {
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if (-not $SignedResource) { throw 'SignedResource (sr) is required for blob SAS: use b, c, d, bv, or bs.' }
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$q['sr'] = $SignedResource
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# Blob snapshot time uses the 'snapshot' parameter when applicable
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if ($SnapshotTime) { $q['snapshot'] = $SnapshotTime }
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if ($SignedResource -eq 'd') {
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if ($null -eq $DirectoryDepth) { throw 'DirectoryDepth (sdd) is required when sr=d (Data Lake Hierarchical Namespace).' }
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$q['sdd'] = [string]$DirectoryDepth
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}
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if ($EncryptionScope -and $Version -ge '2020-12-06') {
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$q['ses'] = $EncryptionScope
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$includeEncryptionScope = $true
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}
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} elseif ($Service -eq 'file') {
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if (-not $SignedResource) { throw 'SignedResource (sr) is required for file SAS: use f or s.' }
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$q['sr'] = $SignedResource
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if ($SnapshotTime) { $q['sst'] = $SnapshotTime }
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} elseif ($Service -eq 'table') {
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# Table SAS may include ranges (spk/srk/epk/erk), omitted here unless future parameters are added
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# Table also uses tn (table name) in query, but canonicalizedResource already includes table name
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# We rely on canonicalizedResource and omit tn unless specified by callers via ResourcePath
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} elseif ($Service -eq 'queue') {
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# No sr for queue
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}
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# Construct string-to-sign based on service and version
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$StringToSign = $null
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if ($Service -eq 'blob') {
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# Version 2018-11-09 and later (optionally 2020-12-06 with encryption scope)
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$fields = @(
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$q['sp'],
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($st ?? ''),
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$q['se'],
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$canonicalizedResource,
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($q.ContainsKey('si') ? $q['si'] : ''),
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($q.ContainsKey('sip') ? $q['sip'] : ''),
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($q.ContainsKey('spr') ? $q['spr'] : ''),
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($q.ContainsKey('sv') ? $q['sv'] : ''),
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$q['sr'],
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($q.ContainsKey('snapshot') ? $q['snapshot'] : ''),
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($includeEncryptionScope ? $q['ses'] : ''),
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($q.ContainsKey('rscc') ? $q['rscc'] : ''),
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($q.ContainsKey('rscd') ? $q['rscd'] : ''),
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($q.ContainsKey('rsce') ? $q['rsce'] : ''),
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($q.ContainsKey('rscl') ? $q['rscl'] : ''),
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($q.ContainsKey('rsct') ? $q['rsct'] : '')
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)
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$StringToSign = ($fields -join "`n")
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} elseif ($Service -eq 'file') {
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# Use 2015-04-05+ format (no signedResource in string until 2018-11-09; we include response headers)
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$fields = @(
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$q['sp'],
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($st ?? ''),
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$q['se'],
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$canonicalizedResource,
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($q.ContainsKey('si') ? $q['si'] : ''),
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($q.ContainsKey('sip') ? $q['sip'] : ''),
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($q.ContainsKey('spr') ? $q['spr'] : ''),
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($q.ContainsKey('sv') ? $q['sv'] : ''),
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($q.ContainsKey('rscc') ? $q['rscc'] : ''),
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($q.ContainsKey('rscd') ? $q['rscd'] : ''),
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($q.ContainsKey('rsce') ? $q['rsce'] : ''),
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($q.ContainsKey('rscl') ? $q['rscl'] : ''),
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($q.ContainsKey('rsct') ? $q['rsct'] : '')
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)
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$StringToSign = ($fields -join "`n")
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} elseif ($Service -eq 'queue') {
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# Version 2015-04-05 and later
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$fields = @(
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$q['sp'],
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($st ?? ''),
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$q['se'],
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$canonicalizedResource,
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($q.ContainsKey('si') ? $q['si'] : ''),
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($q.ContainsKey('sip') ? $q['sip'] : ''),
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($q.ContainsKey('spr') ? $q['spr'] : ''),
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($q.ContainsKey('sv') ? $q['sv'] : '')
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)
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$StringToSign = ($fields -join "`n")
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} elseif ($Service -eq 'table') {
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# Version 2015-04-05 and later
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$fields = @(
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$q['sp'],
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($st ?? ''),
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$q['se'],
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$canonicalizedResource,
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($q.ContainsKey('si') ? $q['si'] : ''),
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($q.ContainsKey('sip') ? $q['sip'] : ''),
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($q.ContainsKey('spr') ? $q['spr'] : ''),
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($q.ContainsKey('sv') ? $q['sv'] : ''),
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'', # startingPartitionKey
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'', # startingRowKey
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'', # endingPartitionKey
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'' # endingRowKey
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)
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$StringToSign = ($fields -join "`n")
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}
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# Generate signature using account key (HMAC-SHA256 over UTF-8 string-to-sign)
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try {
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$SignatureBase64 = _NewSharedKeySignature -AccountKey $AccountKey -StringToSign $StringToSign
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} catch {
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throw "Failed to create SAS signature: $($_.Exception.Message)"
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}
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# Store signature; will be URL-encoded when assembling query
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$q['sig'] = $SignatureBase64
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# Compose ordered query for readability (common fields first)
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$orderedKeys = @('sp', 'st', 'se', 'sip', 'spr', 'sv', 'sr', 'si', 'snapshot', 'ses', 'sdd', 'rscc', 'rscd', 'rsce', 'rscl', 'rsct', 'sig')
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$parts = [System.Collections.Generic.List[string]]::new()
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foreach ($k in $orderedKeys) {
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if ($q.ContainsKey($k) -and -not [string]::IsNullOrEmpty($q[$k])) {
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$parts.Add("$k=" + [System.Net.WebUtility]::UrlEncode($q[$k]))
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}
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}
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# Include any remaining keys
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foreach ($k in $q.Keys) {
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if ($orderedKeys -notcontains $k) {
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$parts.Add("$k=" + [System.Net.WebUtility]::UrlEncode($q[$k]))
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}
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}
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$token = '?' + ($parts -join '&')
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# Return structured output for debugging/usage
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[PSCustomObject]@{
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Token = $token
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Query = $q
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CanonicalizedResource = $canonicalizedResource
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StringToSign = $StringToSign
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Version = $Version
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Service = $Service
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ResourceUri = $uri.AbsoluteUri
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}
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}

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