ActiveDirectory.psm1
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#region Test-ActiveDirectoryGroupMemebership Function Test-ActiveDirectoryGroupMembership { <# .SYNOPSIS Test if a user is a member of a group. .DESCRIPTION Test if a user is member of a security group. .PARAMETER User The username of the user. .PARAMETER Group The name of the group. .EXAMPLE Test-ADNestedGroupMembership myuser mygroup #> Param ( [Parameter(Mandatory=$True, Position=1, ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true)] [Alias("Username", "SamAccountName")] [string[]]$User, [Parameter(Mandatory=$True,Position=2)] [Alias("Groupname")] [string]$Group, [switch]$Recurse ) Begin {} Process { # Loop through the users Foreach($u in $User) { # Create a custom object $obj = New-Object psobject $obj | Add-Member -MemberType NoteProperty -Name User -Value $u $obj | Add-Member -MemberType NoteProperty -Name Group -Value $Group # Test if the user exists try { $aduser = Get-ADUser $u -ErrorAction Stop } catch { Write-Error "Could not find user $u" continue } # Test if the group exists try { $adgroup = Get-ADGroup $Group -ErrorAction Stop } catch { Throw "Could not find group $Group" } $obj | Add-Member NoteProperty "User DN" $aduser.DistinguishedName $obj | Add-Member NoteProperty "Group DN" $adgroup.DistinguishedName if($Recurse) { # Recursive query if( Get-ADUser ` -Filter "memberOf -RecursiveMatch '$($adgroup.DistinguishedName)'" ` -SearchBase $($aduser.DistinguishedName) ) { $obj | Add-Member -MemberType NoteProperty -Name Member -Value $True } else { $obj | Add-Member -MemberType NoteProperty -Name Member -Value $false } } else { # Direct member query if( Get-ADUser ` -Filter {memberof -eq $adGroup.DistinguishedName -and distinguishedname -eq $aduser.DistinguishedName} ) { $obj | Add-Member -MemberType NoteProperty -Name Member -Value $True } else { $obj | Add-Member -MemberType NoteProperty -Name Member -Value $false } } $obj } } End {} } #endregion #region Test-ActiveDirectoryIsDomainAdmin Function Test-ActiveDirectoryIsDomainAdmin { <# .SYNOPSIS Test if a user has domain administrator privileges. .DESCRIPTION Test if a user is member of the Domain Admins security group including nested groups. .PARAMETER Username The username of the user. .EXAMPLE Test-ADIsDomainAdmin myuser This will return true if the user is a member of the Domain Admins group or false if not. #> Param ( [Parameter( Mandatory=$True, Position=0, ValueFromPipeline=$true, ValueFromPipelineByPropertyName=$true) ] [alias("Username")] [string[]]$User ) Begin {} Process { Foreach($u in $User) { # Get the user try { $aduser = Get-ADUser $u -ErrorAction Stop -Properties SamAccountName } catch { Write-Error "Could not find user $u." } Test-ActiveDirectoryGroupMembership -User $aduser.SamAccountName -Group "Domain Admins" -Recurse } } End {} } #endregion #region Get-ActiveDirectoryUserGroupMembershipHistory Function Get-ActiveDirectoryUserGroupMembershipHistory { <# .SYNOPSIS Get the group membership history of an account .DESCRIPTION Get the addition history of a user regarding security groups. This cmdlet only displays the groups that the user is member of and only the date when the user was originaly added. .PARAMETER Username The username of the user. .PARAMETER Group The name of the group .EXAMPLE Get-ADUserGroupMembershipHistory -Username myuser -Group mygroup This will return the memberhip additions of the myuser group to and from the mygroup group. #> Param ( [Parameter(Mandatory=$True,Position=0)] [string]$Username, [Parameter(Mandatory=$False,Position=1)] [string]$Group ) # Get the user from Active Directory try { $userobj = Get-ADUser $username -ErrorAction Stop } catch { Throw "Could not find user $Username." } $results = Get-ADUser $userobj.DistinguishedName -Properties memberOf | Select-Object -ExpandProperty memberOf | ForEach-Object { Get-ADReplicationAttributeMetadata $_ -Server localhost -ShowAllLinkedValues | Where-Object {` $_.AttributeName -eq 'member' -and $_.AttributeValue -eq $userobj.DistinguishedName} | Select-Object -Property ` @{name="OriginallyAdded";Expression={$_.FirstOriginatingCreateTime}}, ` @{name="User";Expression={$username}}, ` @{name="Group";Expression={(Get-ADObject -Identity $_.object).Name}}, ` @{name="UserDN";Expression={$_.AttributeValue}}, ` @{name="GroupDN";Expression={$_.Object}} } # Narrow down th if( $group ) { # Get the group try { $adgroup = Get-AdGroup $Group -ErrorAction Stop } catch { Throw "Could not find group $group." } # Filter the results $results | Where-Object {$_.groupdn -eq $adgroup.distinguishedname} } else { $results } } #endregion #region Get-ActiveDirectoryAccountLockEvent Function Get-ActiveDirectoryAccountLockEvent { <# .Synopsis Get the account lock events. .DESCRIPTION Get the account lock events from the security event log of the domain controllers. .EXAMPLE Get-ActiveDirectoryAccountLockEvent -StartTime $start Account Timestamp Domain Controller Caller Computer ------- --------- ----------------- --------------- cpolydorou 27/5/2017 7:44:43 μμ DC3 WINDOWS10 cpolydorou 27/5/2017 7:44:43 μμ DC1 WINDOWS10 #> [CmdletBinding()] Param ( # The starting date [Parameter(Mandatory=$false, Position=0)] [DateTime] $StartTime ) # Form the event log query $now = [DateTime]::Now # If the start time has not been specified, we'll search for events in last hour if(-Not $StartTime) { $StartTime = $now.AddHours(-1) } $timespan = $now - $StartTime $query = @" <QueryList> <Query Id="0" Path="Security"> <Select Path="Security">*[System[(EventID=4740) and TimeCreated[timediff(@SystemTime) <= $($timespan.TotalMilliseconds)]]]</Select> </Query> </QueryList> "@ # Import the ActiveDirectory module Write-Verbose "Getting Domain Controllers" try { $domainControllers = Get-ADDomainController -Filter * -ErrorAction Stop | % Name } catch { throw "Could not get the Domain Controllers." } # Get the events from all domain controllers Write-Verbose "Getting events" $events = # Search for the relative events on the domain controllers Invoke-Command -ComputerName $domainControllers ` -ScriptBlock { Param( $q ) try { Get-WinEvent -FilterXml $q -ErrorAction Stop } catch { if($_.Exception.Message.StartsWith("No events were found")) { return $null } else { throw $_.Exception } } } -ArgumentList $query # Process the events Write-Verbose "Processing events" foreach($e in $events) { if($e -ne $null) { # Get the account that was locked out $startIndex = $e.Message.IndexOf("Account That Was Locked Out:") + 28 $account = $e.message.substring($startIndex, $e.message.length - $startIndex) $startIndex = $account.IndexOf("Account Name:") + 13 $account = $account.Substring($startIndex, $account.length - $startIndex) $endIndex = $account.IndexOf("`r") $account = $account.substring(0, $endIndex).Trim() # Get the caller computer $start = $e.Message.IndexOf("Caller Computer Name") + 21 $caller = $e.message.substring($start, $e.message.length - $start).Trim() # Create a custom object $obj = New-Object psobject -Property @{ "Timestamp" = $e.TimeCreated "Account" = $account "Caller Computer" = $caller "Domain Controller" = $e.PSComputerName } $obj } } } #endregion #region Exports Export-ModuleMember -Function Test-ActiveDirectoryGroupMembership Export-ModuleMember -Function Test-ActiveDirectoryIsDomainAdmin Export-ModuleMember -Function Get-ActiveDirectoryUserGroupMembershipHistory Export-ModuleMember -Function Get-ActiveDirectoryAccountLockEvent #endregion |