UcmPSTools

0.1.3-alpha

public/New-UcmEXHOConnection.ps1

                                #PerformScriptSigning

Function New-UcmEXHOConnection

{

    <#

            .SYNOPSIS

            Grabs stored creds and creates a new Exchange Online session

            This function is designed to auto reconnect to Exchange Online during batch migrations and the like.

            At present, it does not support modern auth. (I havent intergrated it yet)

            When called, the function looks for a cred.xml file in the current folder and attempts to connect to Exchange Online using Basic Auth

            If there is no cred.xml in the current folder it will prompt for credentials, encrypt them and store them in a cred.xml file.

            The encrypted credentials can only be read by the windows user that created them so other users on the same system cant steal your credentials.

            .EXAMPLE

            PS> New-UcmEXHOConnection

            .INPUTS

            This function does not accept any input

            .OUTPUT

            This Cmdet returns a PSCustomObject with multiple Keys to indicate status

            $Return.Status

            $Return.Message

            Return.Status can return one of three values

            "OK"      : Connected to Skype for Business Online

            "Error"   : Not connected to Skype for Business Online

            "Unknown" : Cmdlet reached the end of the function without returning anything, this shouldnt happen, if it does please log an issue on Github

            Return.Message returns descriptive text showing the connected tenant, mainly for logging or reporting

            .NOTES

            Version:        1.2

            Date:            18/11/2021

            .VERSION HISTORY

            1.2: Fixed function returning "OK" on connection failure ( https://github.com/Atreidae/UcmPSTools/issues/6 )

            1.1: Updated to "Ucm" naming convention

            Better inline documentation

            1.0: Initial Public Release

            .REQUIRED FUNCTIONS/MODULES

            Modules

            MicrosoftTeams                         (Install-Module MicrosoftTeams)

            UcmPSTools                             (Install-Module UcmPSTools) Includes Cmdlets below

            Cmdlets

            Write-UcmLog:                        https://github.com/Atreidae/UcmPSTools/blob/main/public/Write-UcmLog.ps1

            .REQUIRED PERMISSIONS

            Any privledge level that can connect to Exchange Online PowerShell

            Typicaly 'Exchange Read Only Admin' or better

            .LINK

            http://www.UcMadScientist.com

            https://github.com/Atreidae/UcmPsTools

    #>

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidGlobalVars', '', Scope='Function')] #Required for intergration with BounShell

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '', Scope='Function')] #Todo https://github.com/Atreidae/UcmPSTools/issues/24

    [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseShouldProcessForStateChangingFunctions', '', Scope='Function')] #Todo https://github.com/Atreidae/UcmPSTools/issues/27

    Param #No parameters

    (

    )

    #region FunctionSetup, Set Default Variables for HTML Reporting and Write Log

    $function = 'New-UcmEXHOConnection'

    [hashtable]$Return = @{}

    $return.Function = $function

    $return.Status = "Unknown"

    $return.Message = "Function did not return a status message"

    # Log why we were called

    Write-UcmLog -Message "$($MyInvocation.InvocationName) called with $($MyInvocation.Line)" -Severity 1 -Component $function

    Write-UcmLog -Message "Parameters" -Severity 1 -Component $function -LogOnly

    Write-UcmLog -Message "$($PsBoundParameters.Keys)" -Severity 1 -Component $function -LogOnly

    Write-UcmLog -Message "Parameters Values" -Severity 1 -Component $function -LogOnly

    Write-UcmLog -Message "$($PsBoundParameters.Values)" -Severity 1 -Component $function -LogOnly

    Write-UcmLog -Message "Optional Arguments" -Severity 1 -Component $function -LogOnly

    Write-UcmLog -Message "$Args" -Severity 1 -Component $function -LogOnly

    #endregion FunctionSetup

    #region FunctionWork

    #Check we have creds, if not, get and store them

    If ($Null -eq $Global:Config.SignInAddress)

    {

        Write-UcmLog -Message "No Credentials stored in Memory, checking for Creds file" -Severity 2 -Component $function

        If(!(Test-Path cred.xml))

        {

            Write-UcmLog -component $function -Message 'Could not locate creds file' -severity 2

            #Create a new creds file

            $null = (Remove-Variable -Name Config -Scope Global -ErrorAction SilentlyContinue)

            $global:Config = @{}

            $Global:Config.SignInAddress = (Read-Host -Prompt "Username")

            $Global:Config.Password = (Read-Host -Prompt "Password")

            $Global:Config.Override = (Read-Host -Prompt "OverrideDomain (Blank for none)")

            #Encrypt the creds

            $global:Config.Credential = ($Global:Config.Password | ConvertTo-SecureString -AsPlainText -Force)

            Remove-Variable -Name "Config.Password" -Scope "Global" -ErrorAction SilentlyContinue

            #write a secure creds file

            $Global:Config | Export-Clixml -Path ".\cred.xml"

        }

        Else

        {

            Write-UcmLog -component $function -Message 'Importing Credentials File' -severity 2

            $global:Config = @{}

            $global:Config = (Import-Clixml -Path ".\cred.xml")

            Write-UcmLog -component $function -Message 'Creds Loaded' -severity 2

        }

    }

    #Get the creds ready for the module

    $global:StoredPsCred = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList ($global:Config.SignInAddress, $global:Config.Credential)

    ($global:StoredPsCred).Password.MakeReadOnly() #Stop modules deleteing the variable.

    $pscred = $global:StoredPsCred

    #Exchange connection try block

    Try

    {

        Write-UcmLog -Message 'Connecting to Exchange Online' -Severity 2 -Component $function

        #Handle domain override

        if ($null -eq $Global:Config.override){ $EXCHOSession = (New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $pscred -Authentication Basic -AllowRedirection)}

        Else {$EXCHOSession = (New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $pscred -Authentication Basic -AllowRedirection) }

        #Import the connected session

        Import-Module (Import-PSSession -Session $EXCHOSession -AllowClobber -DisableNameChecking) -Global -DisableNameChecking

        #We haven't errored so return sucsessful

        $Return.Status = "OK"

        $Return.Message  = "Connected"

        Return $Return

    }

    Catch

    {

        #Something went wrong during the try block, return error

        $Return.Status = "Error"

        $Return.Message  = "Failed to connect to Exchange Online: $error[0]"

        Return $Return

    }

    #endregion FunctionWork

    #region FunctionReturn

    #Default Return Variable for my HTML Reporting Fucntion

    Write-UcmLog -Message "Reached end of $function without a Return Statement" -Severity 3 -Component $function

    $return.Status = "Unknown"

    $return.Message = "Function did not encounter return statement"

    Return $Return

    #endregion FunctionReturn

}

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