Storage Auth Abac Examples - Document Details

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This page is part of the Azure documentation. It contains code examples and configuration instructions for working with Azure services.

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Bias Analysis

Detected Bias Types

powershell_heavy

missing_linux_example

windows_tools

Summary

The documentation page provides detailed examples for configuring Azure role assignment conditions for Blob Storage, with a strong emphasis on Azure PowerShell for all command-line and scripting examples. There are no examples using cross-platform or Linux-native tools (such as Azure CLI, Bash, or REST API via curl), and all scripting guidance is provided exclusively in PowerShell syntax. This creates a Windows-centric bias, as PowerShell is primarily associated with Windows environments, even though it is available cross-platform. The lack of Linux/Unix-native examples may hinder adoption or ease-of-use for users on non-Windows platforms.

Recommendations

Add equivalent Azure CLI (az) command examples for all PowerShell snippets, as Azure CLI is cross-platform and widely used on Linux and macOS.
Where scripting is shown (e.g., for testing conditions), provide Bash or shell script examples alongside PowerShell.
For REST-based operations, include curl or HTTP request examples to demonstrate how to interact with the API from any platform.
Explicitly mention that PowerShell examples are cross-platform, but clarify how to install and use PowerShell Core on Linux/macOS if retaining PowerShell as a primary example.
Consider reordering or presenting Azure CLI and Bash examples before or alongside PowerShell to avoid the perception of Windows-first bias.
Audit all sections to ensure Linux users can follow the documentation without needing to translate PowerShell commands themselves.

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Scan History

Date	Scan	Status	Result
2026-01-14 00:00	#250	in_progress	Biased
2026-01-13 00:00	#246	completed	Biased
2026-01-11 00:00	#240	completed	Biased
2026-01-10 00:00	#237	completed	Biased
2026-01-09 00:34	#234	completed	Biased
2026-01-08 00:53	#231	completed	Biased
2026-01-06 18:15	#225	cancelled	Clean
2025-08-19 00:01	#85	completed	Clean
2025-07-13 21:37	#48	completed	Biased
2025-07-12 23:44	#41	cancelled	Biased

Flagged Code Snippets

$subId = "<your subscription id>"
$rgName = "<resource group name>"
$storageAccountName = "<storage account name>"
$roleDefinitionName = "Storage Blob Data Contributor"
$userUpn = "<user UPN>"
$userObjectID = (Get-AzADUser -UserPrincipalName $userUpn).Id
$containerName = "container1"
$vnetName = "virtualnetwork1"
$subnetName = "default"
$scope = "/subscriptions/$subId/resourceGroups/$rgName/providers/Microsoft.Storage/storageAccounts/$storageAccountName"

$condition = `
"( `
 ( `
  !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/read'}) `
  AND `
  !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/write'}) `
  AND `
  !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/add/action'}) `
  AND `
 !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/delete'}) `
 ) `
 OR ` 
 ( `
  @Resource[Microsoft.Storage/storageAccounts/blobServices/containers:name] StringEquals '$containerName' `
  AND `
  @Environment[Microsoft.Network/virtualNetworks/subnets] StringEqualsIgnoreCase '/subscriptions/$subId/resourceGroups/$rgName/providers/Microsoft.Network/virtualNetworks/$vnetName/subnets/$subnetName' `
 ) `
)"

$testRa = Get-AzRoleAssignment -Scope $scope -RoleDefinitionName $roleDefinitionName -ObjectId $userObjectID
$testRa.Condition = $condition
$testRa.ConditionVersion = "2.0"
Set-AzRoleAssignment -InputObject $testRa -PassThru

$condition = "((!(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/write'}) AND !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/add/action'}) AND !(ActionMatches{'Microsoft.Storage/storageAccounts/blobServices/containers/blobs/runAsSuperUser/action'})) OR (@Resource[Microsoft.Storage/storageAccounts/blobServices/containers:name] StringEquals 'contosocorp' AND @Resource[Microsoft.Storage/storageAccounts/blobServices/containers/blobs:path] StringLike 'uploads/contoso/*'))"
$testRa = Get-AzRoleAssignment -Scope $scope -RoleDefinitionName $roleDefinitionName -ObjectId $userObjectID
$testRa.Condition = $condition
$testRa.ConditionVersion = "2.0"
Set-AzRoleAssignment -InputObject $testRa -PassThru

$grantedContainer = "contosocorp"
# Get new context for request
$bearerCtx = New-AzStorageContext -StorageAccountName $storageAccountName
# Try to get ungranted blobs
# Wrong name but right tags
$content = Get-AzStorageBlobContent -Container $grantedContainer -Blob "AlpineFile.txt" -Context $bearerCtx
# Right name but wrong tags
$content = Get-AzStorageBlobContent -Container $grantedContainer -Blob "logsAlpine.txt" -Context $bearerCtx
# Try to get granted blob
$content = Get-AzStorageBlobContent -Container $grantedContainer -Blob "logs/AlpineFile.txt" -Context $bearerCtx