Import-Credential.ps1

function Import-Credential {
<#
.SYNOPSIS
 
Import and decrypt a credential object with a static keyphrase
 
.DESCRIPTION
 
Import and decrypt a credential object with a static keyphrase
 
This Cmdlet lets you import credentials via a static keyphrase from a text file.
In contrast to Import-CliXml the SecureString in the Credential object is
not decrypted with the identity of the current user but with a static
keyphrase and thus can be read by any other user (on any other machine) that
also has access to the keyphrase.
 
The Cmdlet does not verify the specifed keyphrase.
 
.INPUTS
 
You can pipe a path to the Cmdlet.
 
.OUTPUTS
 
PSCredential
 
.EXAMPLE
$cred = Import-Credential .\Credential.xml -Keyphrase P@ssw0rd
 
Decrypts the PSCredential object in the file in the currenty directory with
the keyphrase ^P@ssw0rd' and stores the result in the variable '$cred'.
 
.LINK
 
Online Version: http://dfch.biz/biz/dfch/PS/System/Utilities/Import-Credential/
 
.NOTES
 
See module manifest for required software versions and dependencies at:
http://dfch.biz/biz/dfch/PS/System/Utilities/biz.dfch.PS.System.Utilities.psd1/
 
#>

[CmdletBinding(
    SupportsShouldProcess = $true
    ,
    ConfirmImpact = 'Low'
    ,
    HelpURI = 'http://dfch.biz/biz/dfch/PS/System/Utilities/Import-Credential/'
)]

Param
(
    # Specifies the full path and file name of the encrypted credential object
    [Parameter(Mandatory = $true, ValueFromPipeline = $True, Position = 0)]
    [string] $Path
    ,
    # Specifies a keyphrase of the encrypted credential object
    [Parameter(Mandatory = $false, Position = 1)]
    [Alias('Password')]
    [string] $KeyPhrase = [NullString]::Value
)

BEGIN
{
    $datBegin = [datetime]::Now;
    [string] $fn = $MyInvocation.MyCommand.Name;
    Log-Debug -fn $fn -msg ("CALL. Path '{0}'. KeyPhrase.Count '{1}'." -f $Path, $KeyPhrase.Count) -fac 1;
    # Default test variable for checking function response codes.
    [Boolean] $fReturn = $false;
    # Return values are always and only returned via OutputParameter.
    $OutputParameter = $null;
}
PROCESS
{
    try 
    {

        # Parameter validation
        # N/A
        if($PSCmdlet.ShouldProcess($Path)) 
        {
            $Credential = Import-CliXml $Path;
            if($KeyPhrase) 
            {
                $KeyPhrase = $KeyPhrase.PadRight(32, '0').Substring(0, 32);
                $Enc = [System.Text.Encoding]::UTF8;
                $k = $Enc.GetBytes($KeyPhrase);
                
                $Credential.Password = $Credential.Password | ConvertTo-SecureString -Key $k;
                $Credential = New-Object System.Management.Automation.PSCredential($Credential.Username, $Credential.Password);
            } 
            else 
            {
                $Credential = Import-CliXml $Path;
            }
            $fReturn = $true;
            $OutputParameter = $Credential;
        }

    }
    catch 
    {
        if($gotoSuccess -eq $_.Exception.Message) 
        {
            $fReturn = $true;
        } 
        else 
        {
            [string] $ErrorText = "catch [$($_.FullyQualifiedErrorId)]";
            $ErrorText += (($_ | fl * -Force) | Out-String);
            $ErrorText += (($_.Exception | fl * -Force) | Out-String);
            $ErrorText += (Get-PSCallStack | Out-String);
            
            if($_.Exception -is [System.Net.WebException]) 
            {
                Log-Critical $fn ("[WebException] Request FAILED with Status '{0}'. [{1}]." -f $_.Exception.Status, $_);
                Log-Debug $fn $ErrorText -fac 3;
            }
            else 
            {
                Log-Error $fn $ErrorText -fac 3;
                if($gotoError -eq $_.Exception.Message) 
                {
                    Log-Error $fn $e.Exception.Message;
                    $PSCmdlet.ThrowTerminatingError($e);
                } 
                elseif($gotoFailure -eq $_.Exception.Message) 
                { 
                    Write-Verbose ("$fn`n$ErrorText"); 
                } 
                else 
                {
                    throw($_);
                }
            }
            $fReturn = $false;
            $OutputParameter = $null;
        }
    }
    finally 
    {
        # Clean up

        $datEnd = [datetime]::Now;
        Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;
    }
    return $OutputParameter;
}
END
{
    $datEnd = [datetime]::Now;
    Log-Debug -fn $fn -msg ("RET. fReturn: [{0}]. Execution time: [{1}]ms. Started: [{2}]." -f $fReturn, ($datEnd - $datBegin).TotalMilliseconds, $datBegin.ToString('yyyy-MM-dd HH:mm:ss.fffzzz')) -fac 2;
}

} # function
if($MyInvocation.ScriptName) { Export-ModuleMember -Function Import-Credential; } 

#
# Copyright 2014-2015 d-fens GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

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# SASr
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