MSIdentityTools

1.1.4

Get-SamlFederationMetadata.ps1

                                <#

.SYNOPSIS

    Parse Federation Metadata

.EXAMPLE

    PS C:\>Get-MsftIdpAuthority -TenantId tenant.onmicrosoft.com -AppType 'Saml' | Get-SamlFederationMetadata

    Get SAML or WS-Fed Federation Metadata for a specific Microsoft tenant.

.EXAMPLE

    PS C:\>Get-MsftIdpAuthority -TenantId tenant.onmicrosoft.com -AppType 'Saml' | Get-SamlFederationMetadata -AppId 00000000-0000-0000-0000-000000000000

    Get SAML or WS-Fed Federation Metadata for a specific application within a specific Microsoft tenant.

.EXAMPLE

    PS C:\>Get-SamlFederationMetadata 'https://adfs.contoso.com'

    Get SAML or WS-Fed Federation Metadata for an ADFS farm.

.INPUTS

    System.Uri

#>

function Get-SamlFederationMetadata {

    [CmdletBinding()]

    [Alias('Get-WsFedFederationMetadata')]

    [OutputType([xml],[System.Xml.XmlElement[]])]

    param (

        # Identity Provider Authority URI

        [Parameter(Mandatory=$true, ValueFromPipeline=$true, Position=1)]

        [uri] $Issuer,

        # Azure AD Application Id

        [Parameter(Mandatory=$false, Position=2)]

        [guid] $AppId

    )

    ## Remove Microsoft v2.0 endpoint because it is only for OAuth2

    if ($Issuer.Authority -eq 'login.microsoftonline.com') { $Issuer = $Issuer.AbsoluteUri -replace '[/\\]v2.0[/\\]?$','' }

    [uri]$Issuer = "https://login.microsoftonline.com/cc7d0b33-84c6-4368-a879-2e47139b7b1f/federationmetadata/2007-06/federationmetadata.xml?appid=24b523ac-d335-4855-a5c4-e35a1eb78413"

    ## Build common federation metadata URI

    $uriFederationMetadata = New-Object System.UriBuilder $Issuer.AbsoluteUri

    if (!$uriFederationMetadata.Path.EndsWith('/FederationMetadata/2007-06/FederationMetadata.xml',$true,$null)) { $uriFederationMetadata.Path += '/FederationMetadata/2007-06/FederationMetadata.xml' }

    if ($AppId) { $uriFederationMetadata.Query = ConvertTo-QueryString @{

            AppId = $AppId

        }

    }

    ## Download and parse federation metadata

    $FederationMetadata = Invoke-RestMethod -UseBasicParsing -Uri $uriFederationMetadata.Uri.AbsoluteUri -ErrorAction Stop  # Should return ContentType 'application/samlmetadata+xml'

    if ($FederationMetadata -is [string]) {

        try {

            [xml] $xmlFederationMetadata = $FederationMetadata -replace '^[^<]*',''

        }

        catch { throw }

    }

    else {

        [xml] $xmlFederationMetadata = $FederationMetadata

    }

    return $xmlFederationMetadata.GetElementsByTagName('EntityDescriptor')

}

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