AzSK.ADO

1.8.0

Framework/Helpers/ContextHelper.ps1

                                <#

.Description

# Context class for indenity details. 

# Provides functionality to login, create context, get token for api calls

#>

using namespace Microsoft.IdentityModel.Clients.ActiveDirectory

class ContextHelper {

    static hidden [Context] $currentContext;

    static hidden [bool] $IsOAuthScan;

    #This will be used to carry current org under current context.

    static hidden [string] $orgName;

    ContextHelper()

    {

        if(-not [string]::IsNullOrWhiteSpace($env:RefreshToken) -and -not [string]::IsNullOrWhiteSpace($env:ClientSecret))  # this if block will be executed for OAuth based scan

        {

            [ContextHelper]::IsOAuthScan = $true

        }

    }

    hidden static [PSObject] GetCurrentContext()

    {

        return [ContextHelper]::GetCurrentContext($false);

    }

    hidden static [PSObject] GetCurrentContext([bool]$authNRefresh)

    {

        if( (-not [ContextHelper]::currentContext) -or $authNRefresh)

        {

            $clientId = [Constants]::DefaultClientId ;          

            $replyUri = [Constants]::DefaultReplyUri; 

            $adoResourceId = [Constants]::DefaultADOResourceId;

            [AuthenticationContext] $ctx = $null;

            $ctx = [AuthenticationContext]::new("https://login.windows.net/common");

            [AuthenticationResult] $result = $null;

            $azSKUI = $null;

            if([ContextHelper]::IsOAuthScan) { # this if block will be executed for OAuth based scan

                $tokenInfo = [ContextHelper]::GetOAuthAccessToken()

                [ContextHelper]::ConvertToContextObject($tokenInfo)

            }

            else {

                if ( !$authNRefresh -and ($azSKUI = Get-Variable 'AzSKADOLoginUI' -Scope Global -ErrorAction 'Ignore')) {

                    if ($azSKUI.Value -eq 1) {

                        $PromptBehavior = [Microsoft.IdentityModel.Clients.ActiveDirectory.PromptBehavior]::Always

                        $PlatformParameters = New-Object Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters -ArgumentList $PromptBehavior

                        $result = $ctx.AcquireTokenAsync($adoResourceId, $clientId, [Uri]::new($replyUri),$PlatformParameters).Result;

                    }

                    else {

                        $PromptBehavior = [Microsoft.IdentityModel.Clients.ActiveDirectory.PromptBehavior]::Auto

                        $PlatformParameters = New-Object Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters -ArgumentList $PromptBehavior

                        $result = $ctx.AcquireTokenAsync($adoResourceId, $clientId, [Uri]::new($replyUri),$PlatformParameters).Result;

                    }

                }

                else {

                    $PromptBehavior = [Microsoft.IdentityModel.Clients.ActiveDirectory.PromptBehavior]::Auto

                    $PlatformParameters = New-Object Microsoft.IdentityModel.Clients.ActiveDirectory.PlatformParameters -ArgumentList $PromptBehavior

                    $result = $ctx.AcquireTokenAsync($adoResourceId, $clientId, [Uri]::new($replyUri),$PlatformParameters).Result;

                }

                [ContextHelper]::ConvertToContextObject($result)

            }

        }

        return [ContextHelper]::currentContext

    }

    hidden static [PSObject] GetCurrentContext([System.Security.SecureString] $PATToken)

    {

        if(-not [ContextHelper]::currentContext)

        {

            [ContextHelper]::ConvertToContextObject($PATToken)

        }

        return [ContextHelper]::currentContext

    }

    hidden static [PSObject] GetOAuthAccessToken() {

        $tokenInfo = @{};

        try{

            $url = "https://app.vssps.visualstudio.com/oauth2/token"

            # exchange refresh token with new access token

            $body = "client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer&client_assertion=$($env:ClientSecret)&grant_type=refresh_token&assertion=$($env:RefreshToken)&redirect_uri=https://localhost/"

            $res = Invoke-WebRequest -Uri $url -ContentType "application/x-www-form-urlencoded" -Method POST -Body $body

            $response = $res.Content | ConvertFrom-Json

            $tokenInfo['AccessToken'] = $response.access_token

            $expiry = $response.expires_in

            $request_time = get-date

            $tokenInfo['ExpiresOn'] = $request_time.AddSeconds($expiry)

            $refreshToken = ConvertTo-SecureString  $response.refresh_token -AsPlainText -Force

            #Update refresh token if it is expiring in next 1 day 

            $updateTokenInKV = $false

            $secretName = "RefreshTokenForADOScan"

            $tokenSecret = Get-AzKeyVaultSecret -VaultName $env:KeyVaultName -Name $secretName

            if (-not [string]::IsNullOrEmpty($tokenSecret) -and [Helpers]::CheckMember($tokenSecret,"Expires")) {

                if ($tokenSecret.Expires -le [DateTime]::Now.AddDays(1))

                {

                    $updateTokenInKV = $true

                }

            }

            else {

                $updateTokenInKV = $true

            }

            if ($updateTokenInKV -eq $true)

            {

                $RefreshTokenExpiresInDays = [Constants]::RefreshTokenExpiresInDays;

                $ExpiryDate = [DateTime]::Now.AddDays($RefreshTokenExpiresInDays)

                Set-AzKeyVaultSecret -VaultName $env:KeyVaultName -Name $secretName -SecretValue $refreshToken -Expires $ExpiryDate | out-null

            }

        }

        catch{

            write-Host "Error fetching OAuth access token"

            Write-Host $_

            return $null

        }

        return $tokenInfo

    }

    static [string] GetAccessToken([string] $resourceAppIdUri) {

            return [ContextHelper]::GetAccessToken()   

    }

    static [string] GetAccessToken()

    {

        if([ContextHelper]::currentContext)

        {

            # Validate if token is PAT using lenght (PAT has lengh of 52), if PAT dont go to refresh login session.

            #TODO: Change code to find token type supplied PAT or login session token

            #if token expiry is within 2 min, refresh.

            if (([ContextHelper]::currentContext.AccessToken.length -ne 52) -and ([ContextHelper]::currentContext.TokenExpireTimeLocal -le [DateTime]::Now.AddMinutes(2)))

            {

                [ContextHelper]::GetCurrentContext($true);

            }

            return  [ContextHelper]::currentContext.AccessToken

        }

        else

        {

            return $null

        }

    }

    static [string] GetAccessToken([string] $Uri, [string] $tenantId) 

    {

        $rmContext = Get-AzContext

        if (-not $rmContext) {

            throw ([SuppressedException]::new(("No Azure login found"), [SuppressedExceptionType]::InvalidOperation))

        }

        if ([string]::IsNullOrEmpty($tenantId) -and [Helpers]::CheckMember($rmContext,"Tenant")) {

            $tenantId = $rmContext.Tenant.Id

        }

        $authResult = [Microsoft.Azure.Commands.Common.Authentication.AzureSession]::Instance.AuthenticationFactory.Authenticate(

        $rmContext.Account,

        $rmContext.Environment,

        $tenantId,

        [System.Security.SecureString] $null,

        "Never",

        $null,

        $Uri);

        if (-not ($authResult -and (-not [string]::IsNullOrWhiteSpace($authResult.AccessToken)))) {

          throw ([SuppressedException]::new(("Unable to get access token. Authentication Failed."), [SuppressedExceptionType]::Generic))

        }

        return $authResult.AccessToken;

    }

    static [string] GetGraphAccessToken()

    {

        $accessToken = ''

        try

        {   

            #getting azure context because graph access token requires azure environment details.

            $Context = @(Get-AzContext -ErrorAction SilentlyContinue )

            if ($Context.count -eq 0)  

            {

                Write-Host "Graph access is required to evaluate some controls. Attempting to acquire Graph token." -ForegroundColor Cyan

                Connect-AzAccount -ErrorAction Stop

                $Context = @(Get-AzContext -ErrorAction SilentlyContinue)

            }

            if ($null -eq $Context)  

            {

                throw "Unable to acquire Graph token. The signed-in account may not have Graph permission. Control results for controls that depend on AAD group expansion may not be accurate."

            }

            else

            {

                $graphUri = "https://graph.microsoft.com"

                $authResult = [Microsoft.Azure.Commands.Common.Authentication.AzureSession]::Instance.AuthenticationFactory.Authenticate(

                $Context.Account,

                $Context.Environment,

                $Context.Tenant.Id,

                [System.Security.SecureString] $null,

                "Never",

                $null,

                $graphUri);

                if (-not ($authResult -and (-not [string]::IsNullOrWhiteSpace($authResult.AccessToken))))

                {

                    throw ([SuppressedException]::new(("Unable to acquire Graph token. The signed-in account may not have Graph permission. Control results for controls that depend on AAD group expansion may not be accurate."), [SuppressedExceptionType]::Generic))

                }

                $accessToken = $authResult.AccessToken;

            }

        }

        catch

        {

            Write-Host "Unable to acquire Graph token. The signed-in account may not have Graph permission. Control results for controls that depend on AAD group expansion may not be accurate." -ForegroundColor Red

            Write-Host "Continuing without graph access." -ForegroundColor Yellow

            return $null

        }

        return $accessToken;

    }

    hidden [OrganizationContext] SetContext([string] $organizationName)

    {

        if((-not [string]::IsNullOrEmpty($organizationName)))

              {

                     $OrganizationContext = [OrganizationContext]@{

                           OrganizationId = $organizationName;

                           Scope = "/Organization/$organizationName";

                           OrganizationName = $organizationName;

                     };

                     # $organizationId contains the organization name (due to framework).

                     [ContextHelper]::orgName = $organizationName;

                     [ContextHelper]::GetCurrentContext()                  

              }

              else

              {

                     throw [SuppressedException] ("OrganizationName name [$organizationName] is either malformed or incorrect.")

        }

        return $OrganizationContext;

    }

    hidden [OrganizationContext] SetContext([string] $organizationName, [System.Security.SecureString] $PATToken)

    {

        if((-not [string]::IsNullOrEmpty($organizationName)))

              {

                     $OrganizationContext = [OrganizationContext]@{

                           OrganizationId = $organizationName;

                           Scope = "/Organization/$organizationName";

                           OrganizationName = $organizationName;

                     };

                     # $organizationId contains the organization name (due to framework).

                     [ContextHelper]::orgName = $organizationName;

                     [ContextHelper]::GetCurrentContext($PATToken)         

              }

              else

              {

                     throw [SuppressedException] ("OrganizationName name [$organizationName] is either malformed or incorrect.")

        }

        return $OrganizationContext;

    }

    static [void] ResetCurrentContext()

    {

    }

    hidden static ConvertToContextObject([PSObject] $context)

    {

        $contextObj = [Context]::new()

        # We do not get ADO organization id as part of current context. Hence appending org name to both id and name param.

        $contextObj.Organization = [Organization]::new()

        $contextObj.Organization.Id = [ContextHelper]::orgName

        $contextObj.Organization.Name = [ContextHelper]::orgName

        if([ContextHelper]::IsOAuthScan) { # this if block will be executed for OAuth based scan

            $contextObj.Account.Id = [ContextHelper]::GetOAuthUserIdentity($context.AccessToken, $contextObj.Organization.Name)

            $contextObj.AccessToken = $context.AccessToken

            $contextObj.TokenExpireTimeLocal = $context.ExpiresOn

        }

        else {

            $contextObj.Account.Id = $context.UserInfo.DisplayableId

            $contextObj.Tenant.Id = $context.TenantId

            $contextObj.AccessToken = $context.AccessToken

            $contextObj.TokenExpireTimeLocal = $context.ExpiresOn.LocalDateTime

            #$contextObj.AccessToken =  ConvertTo-SecureString -String $context.AccessToken -asplaintext -Force

        }

        [ContextHelper]::currentContext = $contextObj

    }

    hidden static [string] GetOAuthUserIdentity($accessToken, $orgName)

    {

        $apiURL = "https://dev.azure.com/{0}/_apis/connectionData" -f $orgName

        $headers =@{

            Authorization = "Bearer $accesstoken";

            "Content-Type"="application/json"

        };

        try{

            $responseObj = Invoke-RestMethod -Method Get -Uri $apiURL -Headers $headers -UseBasicParsing

            $descriptor = $responseObj.authenticatedUser.descriptor

            $userId = ($descriptor -split '\\')[-1]

            return $userId

        }

        catch{

            return ""

        }

    }

    hidden static ConvertToContextObject([System.Security.SecureString] $patToken)

    {

        $contextObj = [Context]::new()

        $contextObj.Account.Id = [string]::Empty

        $contextObj.Tenant.Id =  [string]::Empty

        $contextObj.AccessToken = [System.Net.NetworkCredential]::new("", $patToken).Password

        # We do not get ADO organization Id as part of current context. Hence appending org name to both Id and Name param.

        $contextObj.Organization = [Organization]::new()

        $contextObj.Organization.Id = [ContextHelper]::orgName

        $contextObj.Organization.Name = [ContextHelper]::orgName 

        #$contextObj.AccessToken = $patToken

        #$contextObj.AccessToken =  ConvertTo-SecureString -String $context.AccessToken -asplaintext -Force

        [ContextHelper]::currentContext = $contextObj

        $apiURL = "https://dev.azure.com/{0}/_apis/connectionData" -f [ContextHelper]::orgName

        #Note: cannot use this WRH method below due to ordering constraints during load in Framework.ps1

        #$header = [WebRequestHelper]::GetAuthHeaderFromUri($apiURL);

        $user = ""

        $base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user, $contextObj.AccessToken)))

        $headers = @{

                        "Authorization"= ("Basic " + $base64AuthInfo); 

                        "Content-Type"="application/json"

                    };

        $responseObj = Invoke-RestMethod -Method Get -Uri $apiURL -Headers $headers -UseBasicParsing

        #If the token is valid, we get: "descriptor"="Microsoft.IdentityModel.Claims.ClaimsIdentity;72f988bf-86f1-41af-91ab-2d7cd011db47\xyz@microsoft.com"

        #Note that even for guest users, we get the host tenant (and not their native tenantId). E.g., "descriptor...;72f...47\pqr@live.com"

        #If the token is invalid, we get a diff object: "descriptor":"System:PublicAccess;aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"

        $authNUserInfo = @(($responseObj.authenticatedUser.descriptor -split ';') -split '\\')

        #Check if the above split resulted in 3 elements (valid token case)

        if ($authNUserInfo.Count -eq 3)

        {

            $contextObj.Tenant.Id = $authNUserInfo[1]

            $contextObj.Account.Id = $authNUserInfo[2]

        }

    }

    static [string] GetCurrentSessionUser() {

        $context = [ContextHelper]::GetCurrentContext()

        if ($null -ne $context) {

            return $context.Account.Id

        }

        else {

            return "NO_ACTIVE_SESSION"

        }

    }

}

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