AadAuthenticationFactory.psm1
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function New-AadAuthenticationFactory { <# .SYNOPSIS Creates authentication factory with provided parameters for Public or Confidential client flows .DESCRIPTION Creates authentication factory with provided parameters for Public or Confidential client flows Authentication uses by default well-know clientId of Azure Powershell, but can accept clientId of app registered in your own tenant. .OUTPUTS AadAuthenticationFactory object .EXAMPLE New-AadAuthenticationFactory -TenantId mydomain.com -RequiredScopes @('https://my-db.documents.azure.com/.default') -AuthMode Interactive Description ----------- This command returns AAD authentication factory for Public client auth flow with well-known clientId for Azure PowerShell and interactive authentication for getting tokens for CosmosDB account #> param ( [Parameter(Mandatory)] [string] #Id of tenant where to autenticate the user. Can be tenant id, or any registerd DNS domain $TenantId, [Parameter()] [string] #ClientId of application that gets token to CosmosDB. #Default: well-known clientId for Azure PowerShell - it already has pre-configured Delegated permission to access CosmosDB resource $ClientId = '1950a258-227b-4e31-a9cf-717495945fc2', [Parameter(Mandatory)] [string[]] #Scopes to ask token for $RequiredScopes, [Parameter(ParameterSetName = 'ConfidentialClientWithSecret')] [string] #Client secret for ClientID #Used to get access as application rather than as calling user $ClientSecret, [Parameter(ParameterSetName = 'ConfidentialClientWithCertificate')] [System.Security.Cryptography.X509Certificates.X509Certificate2] #Authentication certificate for ClientID #Used to get access as application rather than as calling user $X509Certificate, [Parameter()] [string] #AAD auth endpoint #Default: endpoint for public cloud $LoginApi = 'https://login.microsoftonline.com', [Parameter(Mandatory, ParameterSetName = 'PublicClient')] [ValidateSet('Interactive', 'DeviceCode')] [string] #How to authenticate client - via web view or via device code flow $AuthMode, [Parameter(ParameterSetName = 'PublicClient')] [string] #Username hint for authentication UI $UserNameHint ) process { switch($PSCmdlet.ParameterSetName) { 'PublicClient' { new-object GreyCorbel.Identity.Authentication.AadAuthenticationFactory($tenantId, $ClientId, $RequiredScopes, $LoginApi, $AuthMode, $UserNameHint) break; } 'ConfidentialClientWithSecret' { new-object GreyCorbel.Identity.Authentication.AadAuthenticationFactory($tenantId, $ClientId, $clientSecret, $RequiredScopes, $LoginApi) break; } 'ConfidentialClientWithCertificate' { new-object GreyCorbel.Identity.Authentication.AadAuthenticationFactory($tenantId, $ClientId, $X509Certificate, $RequiredScopes, $LoginApi) break; } } } } function Get-AadToken { <# .SYNOPSIS Retrieves AAD token according to configuration of authentication factory .DESCRIPTION Retrieves AAD token according to configuration of authentication factory .OUTPUTS Authentication result from AAD with tokens and other information .EXAMPLE $factory = New-AadAuthenticationFactory -TenantId mydomain.com -RequiredScopes @('https://eventgrid.azure.net/.default') -AuthMode Interactive $factory | Get-AadToken Description ----------- Command creates authentication factory and retrieves AAD token from it #> param ( [Parameter(Mandatory, ValueFromPipeline)] [GreyCorbel.Identity.Authentication.AadAuthenticationFactory] #AAD authentication factory created via New-AadAuthenticationFactory $Factory ) process { $factory.AuthenticateAsync().GetAwaiter().GetResult() } } function Test-AadToken { <# .SYNOPSIS Parses and validates AAD issues token .DESCRIPTION Parses provided IdToken or AccessToken and checks for its validity. Note that some tokens may not be properly validated - this is in case then 'nonce' field present and set in the haeder. AAD issues such tokens for Graph API and nonce is taken into consideration when validating the token. See discussing at https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/609 for more details. .OUTPUTS Parsed token and information about its validity .EXAMPLE $factory = New-AadAuthenticationFactory -TenantId mydomain.com -RequiredScopes @('https://eventgrid.azure.net/.default') -AuthMode Interactive $token = $factory | Get-AadToken $token.idToken | Test-AadToken | fl Description ----------- Command creates authentication factory, asks it to issue token for EventGrid and parses IdToken and validates it #> [CmdletBinding()] param ( [Parameter(Mandatory,ValueFromPipeline)] [string] #IdToken or AccessToken field from token returned by Get-AadToken $Token ) process { $parts = $token.split('.') if($parts.Length -ne 3) { throw 'Invalid format of provided token' } $result = [PSCustomObject]@{ Header = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String((Base64UrlDecode -Data $parts[0]))) | ConvertFrom-Json Payload = [System.Text.Encoding]::UTF8.GetString([Convert]::FromBase64String((Base64UrlDecode -Data $parts[1]))) | ConvertFrom-Json IsValid = $false } $endpoint = $result.Payload.iss.Replace('/v2.0','/') $signingKeys = Invoke-RestMethod -Method Get -Uri "$($endpoint)discovery/keys" $key = $signingKeys.keys | Where-object{$_.kid -eq $result.Header.kid} if($null -eq $key) { throw "Could not find signing key with id = $($result.Header.kid)" } $cert = new-object System.Security.Cryptography.X509Certificates.X509Certificate2(,[Convert]::FromBase64String($key.x5c[0])) $rsa = $cert.PublicKey.Key $payload = "$($parts[0]).$($parts[1])" $dataToVerify = [System.Text.Encoding]::UTF8.GetBytes($payload) $sig = Base64UrlDecode -Data $parts[2] $signature = [Convert]::FromBase64String($sig) switch($result.Header.alg) { 'RS384' { $hash = [System.Security.Cryptography.HashAlgorithmName]::SHA384 break; } 'RS512' { $hash = [System.Security.Cryptography.HashAlgorithmName]::SHA512 break; } default { $hash = [System.Security.Cryptography.HashAlgorithmName]::SHA256 break; } } $padding = [System.Security.Cryptography.RSASignaturePadding]::Pkcs1 $result.IsValid = $rsa.VerifyData($dataToVerify,$signature,$hash,$Padding) $cert.Dispose() if($null -ne $result.Header.nonce) { Write-Verbose "Header contains nonce, so token may not be properly validated. See https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/609" } $result.psobject.typenames.Insert(0,'GreyCorbel.Identity.Authentication.TokenValidationResult') $result } } #region Internals function Base64UrlDecode { param ( [Parameter(Mandatory,ValueFromPipeline)] [string]$Data ) process { $result = $Data $result = $result.Replace('-','+').Replace('_','/') switch($result.Length % 4) { 0 {break;} 2 {$result = "$result=="; break} 3 {$result = "$result="; break;} default {throw "Invalid data format"} } $result } } function Init { param() process { switch($PSEdition) { 'Core' { Add-type -Path "$PSScriptRoot\Shared\netcoreapp2.1\Microsoft.Identity.Client.dll" break; } 'Desktop' { Add-Type -Path "$PSScriptRoot\Shared\net461\Microsoft.Identity.Client.dll" Add-Type -Assembly System.Net.Http break; } } Add-Type -Path "$PSScriptRoot\Shared\netstandard2.0\GreyCorbel.Identity.Authentication.dll" [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 } } #endregion Init |