MeshCentral can now issue AMT TLS certificates using a specified custom root cert.

amtmanager.js

@@ -862,8 +862,14 @@ module.exports.CreateAmtManager = function (parent) {
                     var serverName = 'MeshCentral';
                     if ((domain != null) && (domain.title != null)) { serverName = domain.title; }
                     const certattributes = { 'CN': commonName, 'O': serverName, 'ST': 'MC', 'C': 'MC' };
-                    const issuerattributes = { 'CN': obj.rootCertCN };
-                    const xxCaPrivateKey = obj.parent.certificates.root.key;
+
+                    // See what root certificate to use to sign the TLS cert
+                    var xxCaPrivateKey = obj.parent.certificates.root.key; // Use our own root by default
+                    var issuerattributes = { 'CN': obj.rootCertCN };
+                    if (domain.amtmanager.tlsrootcert2 != null) {
+                        xxCaPrivateKey = domain.amtmanager.tlsrootcert2.key;
+                        issuerattributes = domain.amtmanager.tlsrootcert2.attributes;
+                    }
 
                     // Set the extended key usages
                     var extKeyUsage = { name: 'extKeyUsage', serverAuth: true, clientAuth: true }

certoperations.js

@@ -212,6 +212,30 @@ module.exports.CertificateOperations = function (parent) {
         }
     }
 
+    // Load a generic certificate and key from PFX/P12 or PEM format. Load both keys and attributes.
+    obj.loadGenericCertAndKey = function (config) {
+        if ((typeof config.certpfx == 'string') || (typeof config.certpfxpass == 'string')) {
+            // Load a PFX certificate
+            var r = null;
+            try { r = obj.loadPfxCertificate(parent.getConfigFilePath(config.certpfx), config.certpfxpass); } catch (ex) { console.log(ex); }
+            if ((r != null) && (r.keys.length > 0) && (r.certs.length > 0)) {
+                var attributes = {};
+                for (var j in r.certs[0].subject.attributes) { attributes[r.certs[0].subject.attributes[j].shortName] = r.certs[0].subject.attributes[j].value; }
+                return { cert: obj.pki.certificateToPem(r.certs[0]), key: obj.pki.privateKeyToPem(r.keys[0]), attributes: attributes };
+            }
+        }
+        if ((typeof config.certfile == 'string') || (typeof config.keyfile == 'string')) {
+            // Load a PEM certificate
+            var r = {}
+            r.cert = obj.fs.readFileSync(parent.getConfigFilePath(config.certfile), 'utf8');
+            r.key = obj.fs.readFileSync(parent.getConfigFilePath(config.keyfile), 'utf8');
+            var cert = obj.pki.certificateFromPem(r.cert);
+            r.attributes = {};
+            for (var j in cert.subject.attributes) { r.attributes[cert.subject.attributes[j].shortName] = cert.subject.attributes[j].value; }
+            return r;
+        }
+        return null;
+    }
 
     // Get the setup.bin file
     obj.GetSetupBinFile = function (amtacmactivation, oldmebxpass, newmebxpass, domain, user) {

meshcentral-config-schema.json

@@ -337,6 +337,28 @@
                   "uniqueItems": true
                 }
               },
+              "TlsRootCert": {
+                "description": "Specifies a certificate and private key to use to issue Intel AMT TLS certificates. By default the MeshCentral self-signed root certificate is used.",
+                "type": "object",
+                "properties": {
+                  "certpfx": {
+                    "description": "Name of the certificate file that is in .p12 or .pfx format in meshcentral-data, use this with certpfxpass.",
+                    "type": "string"
+                  },
+                  "certpfxpass": {
+                    "description": "Password for the file specified in certpfx.",
+                    "type": "string"
+                  },
+                  "certfile": {
+                    "description": "Name of the certificate file in PEM format located in meshcentral-data. Using this with keyfile.",
+                    "type": "string"
+                  },
+                  "keyfile": {
+                    "description": "Name of the private key file in PEM format located in meshcentral-data. Using this with certfile.",
+                    "type": "string"
+                  }
+                }
+              },
               "WifiProfiles": {
                 "description": "List of WIFI profiles to setup in any managed Intel AMT device with a WIFI network interface.",
                 "type": "array",

meshcentral.js

@@ -1119,6 +1119,9 @@ function CreateMeshCentralServer(config, args) {
     obj.StartEx1b = function () {
         var i;
 
+        // Setup certificate operations
+        obj.certificateOperations = require('./certoperations.js').CertificateOperations(obj);
+
         // Linux format /var/log/auth.log
         if (obj.config.settings.authlog != null) {
             obj.fs.open(obj.config.settings.authlog, 'a', function (err, fd) {
@@ -1224,6 +1227,20 @@ function CreateMeshCentralServer(config, args) {
                 if (obj.config.domains[i].userconsentflags.desktopprivacybar == true) { flags |= 64; }
                 obj.config.domains[i].userconsentflags = flags;
             }
+
+            // If we have Intel AMT manager settings, take a look at them here.
+            if (typeof obj.config.domains[i].amtmanager == 'object') {
+                if (typeof obj.config.domains[i].amtmanager.tlsrootcert == 'object') {
+                    obj.config.domains[i].amtmanager.tlsrootcert2 = obj.certificateOperations.loadGenericCertAndKey(obj.config.domains[i].amtmanager.tlsrootcert);
+                    if (obj.config.domains[i].amtmanager.tlsrootcert2 == null) { // Show an error message if needed
+                        if (i == '') {
+                            addServerWarning("Unable to load Intel AMT TLS root certificate for default domain.");
+                        } else {
+                            addServerWarning("Unable to load Intel AMT TLS root certificate for domain " + i + ".");
+                        }
+                    }
+                }
+            }
         }
 
         // Log passed arguments into Windows Service Log
@@ -1340,7 +1357,6 @@ function CreateMeshCentralServer(config, args) {
     // Done starting the redirection server, go on to load the server certificates
     obj.StartEx2 = function () {
         // Load server certificates
-        obj.certificateOperations = require('./certoperations.js').CertificateOperations(obj);
         obj.certificateOperations.GetMeshServerCertificate(obj.args, obj.config, function (certs) {
             // Get the current node version
             const nodeVersion = Number(process.version.match(/^v(\d+\.\d+)/)[1]);