Copy Permissions from One User to Another in SharePoint using PowerShell

Permission management in SharePoint is always a complex task especially on large environments. Granting permissions in SharePoint becomes cumbersome when you are in a situation to clone an existing user's access rights. Consider this scenario: You have an existing user in a department granted access to various SharePoint web applications, sites, lists, files, etc. and when a new user joins to this department, You-SharePoint Administrator get the requirement of adding new user to all of the places with same access rights as the existing team member!

How will you compare access rights of an existing team member and grant access in bulk? He may be granted permission on various levels with different access rights. It would become very time-consuming to find and grant same level of permissions to multiple users on multiple SharePoint objects. Existing user may be grated access as part of:

• Farm Administrator group and/or as part of web application policies
• Member of Site collection administrator group
• Permissions granted at site level either as part of SharePoint group or with direct permissions
• Permissions granted to list or libraries by breaking inheritance 
• Access rights may be via List item or folder level permissions.

In short, permissions can be granted at the following levels in SharePoint:
Well, To copy permissions from one user to another user on above levels, I've written this PowerShell script - It just scans all possible levels for given source user's access rights and grants permission to the target user.

PowerShell script to clone SharePoint User Permissions:
This script iterates through each levels as in the above image and copies permissions between given users at List Item/Folder, Lists, site, Site Collection, Web Application and Farm levels. Just change the parameters for variables $SourceUserl, $TargetUser and $WebAppURL accordingly and run the script. You'll find the script outputs logs on the screen, on wherever it copies permissions.

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue
  
#Function to copy user permissions 
Function Copy-UserPermissions($SourceUserID, $TargetUserID, [Microsoft.SharePoint.SPSecurableObject]$Object)
{
    #Determine the given Object type and Get URL of it
    Switch($Object.GetType().FullName)
    {
        "Microsoft.SharePoint.SPWeb"  { $ObjectType = "Site" ; $ObjectURL = $Object.URL; $web = $Object }
        "Microsoft.SharePoint.SPListItem"
        { 
            If($Object.Folder -ne $null)
            {
                $ObjectType = "Folder" ; $ObjectURL = "$($Object.Web.Url)/$($Object.Url)"; $web = $Object.Web
            }
            Else
            {
                $ObjectType = "List Item"; $ObjectURL = "$($Object.Web.Url)/$($Object.Url)" ; $web = $Object.Web
            }
        }
        #Microsoft.SharePoint.SPList, Microsoft.SharePoint.SPDocumentLibrary, Microsoft.SharePoint.SPPictureLibrary,etc
        Default { $ObjectType = "List/Library"; $ObjectURL = "$($Object.ParentWeb.Url)/$($Object.RootFolder.URL)"; $web = $Object.ParentWeb }
    }
  
    #Get Source and Target Users
    $SourceUser = $Web.EnsureUser($SourceUserID)
    $TargetUser = $Web.EnsureUser($TargetUserID)
 
    #Get Permissions of the Source user on given object - Such as: Web, List, Folder, ListItem
    $SourcePermissions = $Object.GetUserEffectivePermissionInfo($SourceUser)
  
    #Iterate through each permission and get the details
    ForEach($SourceRoleAssignment in $SourcePermissions.RoleAssignments)
    {
        #Get all permission levels assigned to User account directly or via SharePOint Group
        $SourceUserPermissions=@()
        ForEach($SourceRoleDefinition in $SourceRoleAssignment.RoleDefinitionBindings)
        {
            #Exclude "Limited Accesses"
            If($SourceRoleDefinition.Name -ne "Limited Access")
            {
                $SourceUserPermissions += $SourceRoleDefinition.Name
            }
        }

        #Check Source Permissions granted directly or through SharePoint Group
        If($SourceUserPermissions)
        {
            If($SourceRoleAssignment.Member -is [Microsoft.SharePoint.SPGroup])
            {
                $SourcePermissionType = "'Member of SharePoint Group - " + $SourceRoleAssignment.Member.Name +"'"       
                #Add Target User to the Source User's Group
                #Get the Group
                $Group = [Microsoft.SharePoint.SPGroup]$SourceRoleAssignment.Member
        
                #Check if user is already member of the group - If not, Add to group
                if( ($Group.Users | where {$_.UserLogin -eq $TargetUserID}) -eq $null )
                {
                    #Add User to Group
                    $Group.AddUser($TargetUser)
                    #Write-Host Added to Group: $Group.Name
                }
            }
            else
            {
                $SourcePermissionType = "Direct Permission"       
                #Add Each Direct permission (such as "Full Control", "Contribute") to Target User
                ForEach($NewRoleDefinition in $SourceUserPermissions)
                {
                    #Role assignment is a linkage between User object and Role Definition
                    $NewRoleAssignment = New-Object Microsoft.SharePoint.SPRoleAssignment($TargetUser)
                    $NewRoleAssignment.RoleDefinitionBindings.Add($web.RoleDefinitions[$NewRoleDefinition])
 
                    $object.RoleAssignments.Add($NewRoleAssignment)
                    $object.Update()
                }
            }
            $SourceUserPermissions = $SourceUserPermissions -join ";"
            Write-Host "***$($ObjectType) Permissions Copied: $($SourceUserPermissions) at $($ObjectURL) via $($SourcePermissionType)***"
        }
    }
}
  
Function Clone-SPUser($SourceUserID, $TargetUserID, $WebAppURL)
{
    ###Check Whether the Source Users is a Farm Administrator ###
    Write-host "Scanning Farm Administrators Group..."
    #Get the SharePoint Central Administration site
    $AdminWebApp = Get-SPwebapplication -includecentraladministration | where {$_.IsAdministrationWebApplication}
    $AdminSite = Get-SPWeb $AdminWebApp.Url
    $AdminGroupName = $AdminSite.AssociatedOwnerGroup
    $FarmAdminGroup = $AdminSite.SiteGroups[$AdminGroupName]
 
    #Enumerate in farm adminidtrators groups
    ForEach ($user in $FarmAdminGroup.users)
    {
        If($User.LoginName.Endswith($SourceUserID,1)) #1 to Ignore Case
        {
            #Add the target user to Farm Administrator Group
            $FarmAdminGroup.AddUser($TargetUserID,"",$TargetUserID , "")
            Write-Host "***Added to Farm Administrators Group!***"
        }
    }
      
    ### Check Web Application User Policies ###
    Write-host "Scanning Web Application Policies..."
    $WebApp = Get-SPWebApplication $WebAppURL 
   
    Foreach ($Policy in $WebApp.Policies)
    {
        #Check if the search users is member of the group
        If($Policy.UserName.EndsWith($SourceUserID,1))
        {
            #Write-Host $Policy.UserName
            $PolicyRoles=@()
            ForEach($Role in $Policy.PolicyRoleBindings)
            {
                $PolicyRoles+= $Role
            }
        }
    }
    #Add Each Policy found
    If($PolicyRoles)
    {
        $WebAppPolicy = $WebApp.Policies.Add($TargetUserID, $TargetUserID)
        ForEach($Policy in $PolicyRoles)
        {
            $WebAppPolicy.PolicyRoleBindings.Add($Policy)
        }
        $WebApp.Update()
        Write-host "***Added to Web application Policies!***"
    }
    
    ### Drill down to Site Collections, Webs, Lists & Libraries, Folders and List items ###
    #Get all Site collections of given web app
    $SiteCollections = Get-SPSite -WebApplication $WebAppURL -Limit All
  
    #Convert UserID Into Claims format - If WebApp is claims based! Domain\User to i:0#.w|Domain\User
    If( (Get-SPWebApplication $WebAppURL).UseClaimsAuthentication)
    {
        $SourceUserID = (New-SPClaimsPrincipal -identity $SourceUserID -identitytype 1).ToEncodedString()
        $TargetUserID = (New-SPClaimsPrincipal -identity $TargetUserID -identitytype 1).ToEncodedString()
    }
   
    #Loop through all site collections 
    Foreach($Site in $SiteCollections)
    {
        #Prepare the Target user 
        $TargetUser = $Site.RootWeb.EnsureUser($TargetUserID)
   
        Write-host "Scanning Site Collection Administrators Group for:" $site.Url
        ###Check Whether the User is a Site Collection Administrator
        Foreach($SiteCollAdmin in $Site.RootWeb.SiteAdministrators)
        {
            If($SiteCollAdmin.LoginName.EndsWith($SourceUserID,1))
            {
                #Make the user as Site collection Admin
                $TargetUser.IsSiteAdmin = $true
                $TargetUser.Update()
                Write-host "***Added to Site Collection Admin Group***"
            }
        }
 
        #Get all webs
        $WebsCollection = $Site.AllWebs
        #Loop throuh each Site (web)
        Foreach($Web in $WebsCollection)
        {
            If($Web.HasUniqueRoleAssignments -eq $True)
            {
                Write-host "Scanning Site:" $Web.Url
       
                #Call the function to Copy Permissions to TargetUser
                Copy-UserPermissions $SourceUserID $TargetUserID $Web  
            }
 
            #Check Lists with Unique Permissions
            Write-host "Scanning Lists on $($web.url)..."
            Foreach($List in $web.Lists)
            {
                If($List.HasUniqueRoleAssignments -eq $True -and ($List.Hidden -eq $false))
                {
                    #Call the function to Copy Permissions to TargetUser
                    Copy-UserPermissions $SourceUserID $TargetUserID $List
                }

                #Check Folders with Unique Permissions
                $UniqueFolders = $List.Folders | where { $_.HasUniqueRoleAssignments -eq $True }
                #Get Folder permissions
                If($UniqueFolders)
                {
                    Foreach($folder in $UniqueFolders)
                    {
                        #Call the function to Copy Permissions to TargetUser
                        Copy-UserPermissions $SourceUserID $TargetUserID $folder    
                    }
                }
      
                #Check List Items with Unique Permissions
                $UniqueItems = $List.Items | where { $_.HasUniqueRoleAssignments -eq $True }
                If($UniqueItems)
                {
                    #Get Item level permissions
                    Foreach($item in $UniqueItems)
                    {
                        #Call the function to Copy Permissions to TargetUser
                        Copy-UserPermissions $SourceUserID $TargetUserID $Item
                    }
                }
            }
        }
    }
    Write-Host "Permission are copied successfully!" 
}

#Define variables for processing
$WebAppURL = "http://sharepoint.crescent.com"

#Provide input for source and Target user Ids
$SourceUser ="Crescent\TonyW"
$TargetUser ="Crescent\Salaudeen"

#Call the function to clone user access rights
Clone-SPUser $SourceUser $TargetUser $WebAppURL 

Copy User Permissions at list level:
This script is broken into two functions: Copy-UserPermissions and Clone-SPSuer for convenience. Lets say, you want to copy permissions at list level, then you can utilize the Copy-UserPermission function as:

 
$WebURL = "http://sharepoint.crescent.com/sites/sales"

$web = Get-SPWeb $WebURL

$SourceUser ="i:0#.w|Crescent\TonyW"
$TargetUser ="i:0#.w|Crescent\Salaudeen"

$list = $Web.Lists["Invoice"]

#$folder = $list.Folders[0]
#$ListItem = $list.Items[0]

#Call the function to copy user permissions programmatically at LIST level
Copy-UserPermissions $SourceUser $TargetUser $list

This script just clone's user permissions at list level (copies at only list level, no drill-down to Folders and Items!).


Clone User Permissions from a CSV file: 
When you have to copy permissions for multiple users, you can use a CSV file and the PowerShell script. Here is an example:

Create a CSV File as this format and populate it according to your requirements:

Use this PowerShell script to read from CSV file and copy user permissions

$CSVFilePath = "C:\temp\CloneUsers.csv"

#Get the CSV file
$CSVFile = Import-Csv $CSVFilePath

#Read CSV file and create document document library
ForEach($Line in $CSVFile)
{
    #Get CSV File Entries
    $WebAppURL = $Line.WebAppURL
    $SourceUser = $Line.SourceUser
    $TargetUser = $Line.TargetUser
    
    #Call the Function to Clone user permissions
    Clone-SPUser $SourceUser $TargetUser $WebAppURL
}