# DefaultDCPolicy.ps1
# DSC Configuration: Default Domain Controllers Policy for example.internal
#
# SINGLE SOURCE OF TRUTH: All values are read from settings.ps1.
# Do NOT hardcode policy values here -- edit settings.ps1 instead.
#
# These settings define who can perform privileged operations on DCs
# and how DC network communications are secured.

# Load helpers for SID resolution and registry value parsing
. (Join-Path $PSScriptRoot '..\lib\GPOHelper.ps1')

# Load the authoritative settings
$dcSettings = & (Join-Path $PSScriptRoot 'settings.ps1')
$privRights = $dcSettings.SecurityPolicy['Privilege Rights']
$regValues  = $dcSettings.SecurityPolicy['Registry Values']

# ---------------------------------------------------------------
# Privilege Rights: Se* constant -> DSC policy name mapping
# ---------------------------------------------------------------
$privilegeMap = @{
    'SeAssignPrimaryTokenPrivilege'   = 'Replace_a_process_level_token'
    'SeAuditPrivilege'                = 'Generate_security_audits'
    'SeDebugPrivilege'                = 'Debug_programs'
    'SeBackupPrivilege'               = 'Back_up_files_and_directories'
    'SeRestorePrivilege'              = 'Restore_files_and_directories'
    'SeBatchLogonRight'               = 'Log_on_as_a_batch_job'
    'SeInteractiveLogonRight'         = 'Allow_log_on_locally'
    'SeRemoteInteractiveLogonRight'   = 'Allow_log_on_through_Remote_Desktop_Services'
    'SeNetworkLogonRight'             = 'Access_this_computer_from_the_network'
    'SeChangeNotifyPrivilege'         = 'Bypass_traverse_checking'
    'SeMachineAccountPrivilege'       = 'Add_workstations_to_domain'
    'SeEnableDelegationPrivilege'     = 'Enable_computer_and_user_accounts_to_be_trusted_for_delegation'
    'SeCreatePagefilePrivilege'       = 'Create_a_pagefile'
    'SeIncreaseBasePriorityPrivilege' = 'Increase_scheduling_priority'
    'SeIncreaseQuotaPrivilege'        = 'Adjust_memory_quotas_for_a_process'
    'SeLoadDriverPrivilege'           = 'Load_and_unload_device_drivers'
    'SeProfileSingleProcessPrivilege' = 'Profile_single_process'
    'SeSystemProfilePrivilege'        = 'Profile_system_performance'
    'SeRemoteShutdownPrivilege'       = 'Force_shutdown_from_a_remote_system'
    'SeShutdownPrivilege'             = 'Shut_down_the_system'
    'SeSecurityPrivilege'             = 'Manage_auditing_and_security_log'
    'SeTakeOwnershipPrivilege'        = 'Take_ownership_of_files_or_other_objects'
    'SeSystemEnvironmentPrivilege'    = 'Modify_firmware_environment_values'
    'SeSystemTimePrivilege'           = 'Change_the_system_time'
    'SeUndockPrivilege'               = 'Remove_computer_from_docking_station'
}

# Build DSC-friendly privilege list: resolve SIDs to NTAccount names
$dscPrivileges = @()
foreach ($seConst in $privRights.Keys) {
    if (-not $privilegeMap.ContainsKey($seConst)) {
        Write-Warning "Unknown privilege constant '$seConst' -- no DSC mapping. Skipping."
        continue
    }

    $dscPrivileges += @{
        ResourceName = $seConst -replace '^Se', ''
        Policy       = $privilegeMap[$seConst]
        Identity     = Resolve-SIDsToNames $privRights[$seConst]
    }
}

# ---------------------------------------------------------------
# Registry Values -> SecurityOption mapping (semantic)
# The mapping from DWORD values to DSC enum strings is
# setting-specific and must be maintained here.
# ---------------------------------------------------------------
$dcRegToSecOption = @{
    'LDAPServerIntegrity' = @{
        DscProperty = 'Domain_controller_LDAP_server_signing_requirements'
        ValueMap    = @{ 1 = 'None'; 2 = 'Require signing' }
    }
    'RequireSignOrSeal' = @{
        DscProperty = 'Domain_member_Digitally_encrypt_or_sign_secure_channel_data_always'
        ValueMap    = @{ 0 = 'Disabled'; 1 = 'Enabled' }
    }
    'RequireSecuritySignature' = @{
        DscProperty = 'Microsoft_network_server_Digitally_sign_communications_always'
        ValueMap    = @{ 0 = 'Disabled'; 1 = 'Enabled' }
    }
    'EnableSecuritySignature' = @{
        DscProperty = 'Microsoft_network_server_Digitally_sign_communications_if_client_agrees'
        ValueMap    = @{ 0 = 'Disabled'; 1 = 'Enabled' }
    }
}

# Extract short key name from full registry paths and map to DSC values
$dscSecOptions = @{}
foreach ($regPath in $regValues.Keys) {
    $shortKey = ($regPath -split '\\')[-1]

    if ($dcRegToSecOption.ContainsKey($shortKey)) {
        $mapping  = $dcRegToSecOption[$shortKey]
        $numValue = Get-GptTmplRegValue $regValues[$regPath]
        $dscValue = $mapping.ValueMap[$numValue]

        if ($null -eq $dscValue) {
            throw "No DSC value mapping for $shortKey = $numValue"
        }

        $dscSecOptions[$mapping.DscProperty] = $dscValue
    }
}

# ---------------------------------------------------------------
# DSC Configuration
# ---------------------------------------------------------------
Configuration DefaultDCPolicy
{
    Import-DscResource -ModuleName SecurityPolicyDsc

    Node 'localhost'
    {
        # ===============================================================
        # User Rights Assignments (generated from settings.ps1)
        # Force = $true means DSC controls the full list exclusively.
        # Any identities not listed will be removed from the privilege.
        # ===============================================================
        foreach ($priv in $dscPrivileges) {
            UserRightsAssignment $priv.ResourceName
            {
                Policy   = $priv.Policy
                Identity = $priv.Identity
                Force    = $true
            }
        }

        # ===============================================================
        # Security Options (generated from settings.ps1 Registry Values)
        # ===============================================================
        SecurityOption 'DCSecurityOptions'
        {
            Name = 'DCSecurityOptions'
            Domain_controller_LDAP_server_signing_requirements                      = $dscSecOptions['Domain_controller_LDAP_server_signing_requirements']
            Domain_member_Digitally_encrypt_or_sign_secure_channel_data_always      = $dscSecOptions['Domain_member_Digitally_encrypt_or_sign_secure_channel_data_always']
            Microsoft_network_server_Digitally_sign_communications_always           = $dscSecOptions['Microsoft_network_server_Digitally_sign_communications_always']
            Microsoft_network_server_Digitally_sign_communications_if_client_agrees = $dscSecOptions['Microsoft_network_server_Digitally_sign_communications_if_client_agrees']
        }
    }
}