Adds renewal handling for Icinga for Windows certificate

Author: LordHepipud

lib/core/installer/Start-IcingaForWindowsInstallation.psm1

@@ -312,11 +312,9 @@ function Start-IcingaForWindowsInstallation()
         };
     }
 
-    # Install Icinga for Windows certificate if both, JEA and REST is installed
-    if ($InstallJEA -And $InstallRESTApi) {
-        Install-IcingaForWindowsCertificate;
-        Restart-IcingaWindowsService;
-    }
+    # Always install the Icinga for Windows certificate
+    Install-IcingaForWindowsCertificate;
+    Restart-IcingaWindowsService;
 
     # Update configuration and clear swap
     $ConfigSwap = Get-IcingaPowerShellConfig -Path 'Framework.Config.Swap';

lib/core/installer/menu/manage/framework/ToogleFrameworkApiChecks.psm1

@@ -7,10 +7,8 @@ function Invoke-IcingaForWindowsManagementConsoleToggleFrameworkApiChecks()
             Register-IcingaBackgroundDaemon -Command 'Start-IcingaWindowsRESTApi';
             Add-IcingaRESTApiCommand -Command 'Invoke-IcingaCheck*' -Endpoint 'apichecks';
         }
-        if ([string]::IsNullOrEmpty((Get-IcingaJEAContext)) -eq $FALSE) {
-            Install-IcingaForWindowsCertificate;
-        }
 
+        Install-IcingaForWindowsCertificate;
         Enable-IcingaFrameworkApiChecks;
     }
 

lib/core/jea/Install-IcingaJeaProfile.psm1

@@ -26,10 +26,7 @@ function Install-IcingaJEAProfile()
     Write-IcingaJEAProfile -RebuildFramework:$RebuildFramework -AllowScriptBlocks:$AllowScriptBlocks;
     Write-IcingaConsoleNotice 'Registering Icinga for Windows JEA profile'
     Register-IcingaJEAProfile -IcingaUser $IcingaUser -TestEnv:$TestEnv -ConstrainedLanguage:$ConstrainedLanguage;
-
-    if ((Get-IcingaBackgroundDaemons).ContainsKey('Start-IcingaWindowsRESTApi')) {
-        Install-IcingaForWindowsCertificate;
-    }
+    Install-IcingaForWindowsCertificate;
 }
 
 Set-Alias -Name 'Update-IcingaJEAProfile' -Value 'Install-IcingaJEAProfile';

lib/core/wintasks/daemon/Register-TaskRenewCertificate.psm1

@@ -20,7 +20,7 @@ function Register-IcingaWindowsScheduledTaskRenewCertificate()
     $TaskPrincipal = New-ScheduledTaskPrincipal -GroupId 'S-1-5-32-544' -RunLevel 'Highest';
     $TaskSettings  = New-ScheduledTaskSettingsSet -DontStopIfGoingOnBatteries -AllowStartIfOnBatteries -StartWhenAvailable;
 
-    Register-ScheduledTask -TaskName $TaskName -TaskPath $TaskPath -Force -Principal $TaskPrincipal -Action $TaskAction -Trigger $TaskTrigger -Settings $TaskSettings;
+    Register-ScheduledTask -TaskName $TaskName -TaskPath $TaskPath -Force -Principal $TaskPrincipal -Action $TaskAction -Trigger $TaskTrigger -Settings $TaskSettings | Out-Null;
 
-    Write-IcingaConsoleWarning -Message 'The task "{0}" has been successfully registered at location "{1}".' -Objects $TaskName, $TaskPath;
+    Write-IcingaConsoleNotice -Message 'The task "{0}" has been successfully registered at location "{1}".' -Objects $TaskName, $TaskPath;
 }

lib/daemon/Start-IcingaPowerShellDaemon.psm1

@@ -39,7 +39,6 @@ function Start-IcingaForWindowsDaemon()
         Add-IcingaThreadPool -Name 'MainPool' -MaxInstances 20;
         $Global:Icinga.Public.Add('SSLCertificate', $Certificate);
 
-
         New-IcingaThreadInstance -Name "Main" -ThreadPool (Get-IcingaThreadPool -Name 'MainPool') -Command 'Add-IcingaForWindowsDaemon' -Start;
     } else {
         Write-IcingaDebugMessage -Message 'Starting Icinga for Windows service inside JEA context' -Objects $RunAsService, $JEARestart, $JeaProfile;

lib/daemons/RestAPI/daemon/New-IcingaForWindowsRESTApi.psm1

@@ -54,21 +54,20 @@ function New-IcingaForWindowsRESTApi()
 
     Write-IcingaDebugMessage -Message ($Global:Icinga.Public.Daemons.RESTApi.RegisteredEndpoints | Out-String);
 
-    if ($Global:Icinga.Protected.JEAContext) {
-        if ($Global:Icinga.Public.ContainsKey('SSLCertificate') -eq $FALSE -Or $null -eq $Global:Icinga.Public.SSLCertificate) {
-            Write-IcingaEventMessage -EventId 2001 -Namespace 'RESTApi';
-            return;
+    while ($TRUE) {
+        if ($null -eq $Global:Icinga.Public.SSLCertificate) {
+            $Global:Icinga.Public.SSLCertificate = (Get-IcingaForWindowsCertificate);
+        } else {
+            break;
         }
 
-        $Certificate = $Global:Icinga.Public.SSLCertificate;
-    } else {
-        $Certificate = Get-IcingaSSLCertForSocket -CertFile $CertFile -CertThumbprint $CertThumbprint;
+        # Wait 5 minutes and try again
+        Write-IcingaEventMessage -EventId 2002 -Namespace 'RESTApi';
+        Start-Sleep -Seconds (60 * 5);
     }
 
-    if ($null -eq $Certificate) {
-        Write-IcingaEventMessage -EventId 2000 -Namespace 'RESTApi';
-        return;
-    }
+    # Create a background thread to renew the certificate on a regular basis
+    Start-IcingaForWindowsCertificateThreadTask;
 
     $Socket = New-IcingaTCPSocket -Address $Address -Port $Port -Start;
 
@@ -82,7 +81,7 @@ function New-IcingaForWindowsRESTApi()
 
         $Connection = Open-IcingaTCPClientConnection `
             -Client (New-IcingaTCPClient -Socket $Socket) `
-            -Certificate $Certificate;
+            -Certificate $Global:Icinga.Public.SSLCertificate;
 
         if ($Connection.Client -eq $null -Or $Connection.Stream -eq $null) {
             Close-IcingaTCPConnection -Connection $Connection;

lib/daemons/RestAPI/eventlog/Register-IcingaEventLogMessagesRESTApi.psm1

@@ -11,9 +11,27 @@ function Register-IcingaEventLogMessagesRESTApi()
             2001 = @{
                 'EntryType' = 'Error';
                 'Message'   = 'Failed to start REST-Api daemon in JEA context';
-                'Details'   = 'Icinga for Windows is being used inside a JEA context as service with the REST-Api daemon. To establish a secure TLS socket, it is required to create certificates in advance for the socket to bind on with "Install-IcingaForWindowsCertificate". The REST-Api daemon will now exit.';
+                'Details'   = 'Icinga for Windows is being used inside a JEA context as service with the REST-Api daemon. To establish a secure TLS socket, it is required to create certificates in advance for the socket to bind on with "Start-IcingaWindowsScheduledTaskRenewCertificate". The REST-Api daemon will now exit.';
                 'EventId'   = 2001;
             };
+            2002 = @{
+                'EntryType' = 'Warning';
+                'Message'   = 'Icinga for Windows certificate not ready';
+                'Details'   = 'The Icinga for Windows REST-Api was not able to fetch the icingaforwindows.pfx certificate file. You can manually enforce the certificate creation by using the command "Start-IcingaWindowsScheduledTaskRenewCertificate". Once successful, this message should disappear and the REST-Api start. If the error persist, ensure your Icinga Agent certificate is configured properly and signed by your Icinga CA. This check is queued every 5 minutes and should vanish once everything works fine.';
+                'EventId'   = 2002;
+            };
+            2003 = @{
+                'EntryType' = 'Warning';
+                'Message'   = 'Icinga for Windows certificate was not found';
+                'Details'   = 'The Icinga for Windows "icingaforwindows.pfx" file was not found on the system while the REST-Api is running. Please ensure the certificate is created shortly, as the daemon will no longer work once it will be restarted or the certificate is due for renewal. Please run "Start-IcingaWindowsScheduledTaskRenewCertificate" to re-create the certificate on your machine.'
+                'EventId'   = 2003;
+            };
+            2004 = @{
+                'EntryType' = 'Information';
+                'Message'   = 'Icinga for Windows certificate was renewed';
+                'Details'   = 'The Icinga for Windows certificate has been modified and was updated inside the Icinga for Windows REST-Api daemon.'
+                'EventId'   = 2004;
+            };
             2050 = @{
                 'EntryType' = 'Error';
                 'Message'   = 'Failed to parse received REST-Api call';

lib/daemons/RestAPI/threads/New-IcingaForWindowsCertificateThreadTaskInstance.psm1

@@ -0,0 +1,23 @@
+function New-IcingaForWindowsCertificateThreadTaskInstance()
+{
+    $IcingaHostname = Get-IcingaHostname -ReadConstants;
+
+    while ($TRUE) {
+        # Check every 10 minutes if our certificate is present and update it in case it is
+        # missing or updates have happened
+        $NewIcingaForWindowsCertificate = Get-IcingaForWindowsCertificate;
+
+        if ($null -ne $NewIcingaForWindowsCertificate) {
+            if ($NewIcingaForWindowsCertificate.Issuer.ToLower() -eq ([string]::Format('cn={0}', $IcingaHostname).ToLower())) {
+                Write-IcingaEventMessage -EventId 1506 -Namespace 'Framework';
+            } else {
+                if ($Global:Icinga.Public.SSLCertificate.GetCertHashString() -ne $NewIcingaForWindowsCertificate.GetCertHashString()) {
+                    $Global:Icinga.Public.SSLCertificate = $NewIcingaForWindowsCertificate;
+                    Write-IcingaEventMessage -EventId 2004 -Namespace 'RESTApi';
+                }
+            }
+        }
+
+        Start-Sleep -Seconds (60 * 10);
+    }
+}

lib/daemons/RestAPI/threads/Start-IcingaForWindowsCertificateThreadTask.psm1

@@ -0,0 +1,8 @@
+function Start-IcingaForWindowsCertificateThreadTask()
+{
+    New-IcingaThreadInstance `
+        -Name 'CertificateRenewThread' `
+        -ThreadPool (New-IcingaThreadPool -MaxInstances 1) `
+        -Command 'New-IcingaForWindowsCertificateThreadTaskInstance' `
+        -Start;
+}