CORDA-1915 node rejects CorDapps signed by our dev keys in prod mode (#4041)

Related to CORDA-1915 Signing CorDapp JARs - Corda node rejects CorDapps signed by our development keys when running in production mode. This prevents Cordapps signed by our dev key (by default) running in production (node devMode=false).

node/src/main/kotlin/net/corda/node/internal/AbstractNode.kt

@@ -72,6 +72,7 @@ import net.corda.node.services.transactions.SimpleNotaryService
 import net.corda.node.services.upgrade.ContractUpgradeServiceImpl
 import net.corda.node.services.vault.NodeVaultService
 import net.corda.node.utilities.*
+import net.corda.nodeapi.internal.DEV_CERTIFICATES
 import net.corda.nodeapi.internal.NodeInfoAndSigned
 import net.corda.nodeapi.internal.SignedNodeInfo
 import net.corda.nodeapi.internal.config.CertificateStore
@@ -513,10 +514,12 @@ abstract class AbstractNode<S>(val configuration: NodeConfiguration,
             // CorDapp will be generated.
             generatedCordapps += VirtualCordapp.generateSimpleNotaryCordapp(versionInfo)
         }
+        val blacklistedCerts = if (configuration.devMode) emptyList() else DEV_CERTIFICATES
         return JarScanningCordappLoader.fromDirectories(
                 configuration.cordappDirectories,
                 versionInfo,
-                extraCordapps = generatedCordapps
+                extraCordapps = generatedCordapps,
+                blacklistedCerts = blacklistedCerts
         )
     }
 

node/src/main/kotlin/net/corda/node/internal/cordapp/JarScanningCordappLoader.kt

@@ -26,6 +26,7 @@ import java.lang.reflect.Modifier
 import java.net.URL
 import java.net.URLClassLoader
 import java.nio.file.Path
+import java.security.cert.X509Certificate
 import java.util.*
 import java.util.jar.JarInputStream
 import kotlin.reflect.KClass
@@ -38,7 +39,8 @@ import kotlin.streams.toList
  */
 class JarScanningCordappLoader private constructor(private val cordappJarPaths: List<RestrictedURL>,
                                                    private val versionInfo: VersionInfo = VersionInfo.UNKNOWN,
-                                                   extraCordapps: List<CordappImpl>) : CordappLoaderTemplate() {
+                                                   extraCordapps: List<CordappImpl>,
+                                                   private val blacklistedCordappSigners: List<X509Certificate> = emptyList()) : CordappLoaderTemplate() {
 
     override val cordapps: List<CordappImpl> by lazy {
         loadCordapps() + extraCordapps
@@ -64,10 +66,11 @@ class JarScanningCordappLoader private constructor(private val cordappJarPaths:
          */
         fun fromDirectories(cordappDirs: Collection<Path>,
                             versionInfo: VersionInfo = VersionInfo.UNKNOWN,
-                            extraCordapps: List<CordappImpl> = emptyList()): JarScanningCordappLoader {
+                            extraCordapps: List<CordappImpl> = emptyList(),
+                            blacklistedCerts: List<X509Certificate> = emptyList()): JarScanningCordappLoader {
             logger.info("Looking for CorDapps in ${cordappDirs.distinct().joinToString(", ", "[", "]")}")
             val paths = cordappDirs.distinct().flatMap(this::jarUrlsInDirectory).map { it.restricted() }
-            return JarScanningCordappLoader(paths, versionInfo, extraCordapps)
+            return JarScanningCordappLoader(paths, versionInfo, extraCordapps, blacklistedCerts)
         }
 
         /**
@@ -75,9 +78,9 @@ class JarScanningCordappLoader private constructor(private val cordappJarPaths:
          *
          * @param scanJars Uses the JAR URLs provided for classpath scanning and Cordapp detection.
          */
-        fun fromJarUrls(scanJars: List<URL>, versionInfo: VersionInfo = VersionInfo.UNKNOWN, extraCordapps: List<CordappImpl> = emptyList()): JarScanningCordappLoader {
+        fun fromJarUrls(scanJars: List<URL>, versionInfo: VersionInfo = VersionInfo.UNKNOWN, extraCordapps: List<CordappImpl> = emptyList(), blacklistedCerts: List<X509Certificate> = emptyList()): JarScanningCordappLoader {
             val paths = scanJars.map { it.restricted() }
-            return JarScanningCordappLoader(paths, versionInfo, extraCordapps)
+            return JarScanningCordappLoader(paths, versionInfo, extraCordapps, blacklistedCerts)
         }
 
         private fun URL.restricted(rootPackageName: String? = null) = RestrictedURL(this, rootPackageName)
@@ -106,6 +109,20 @@ class JarScanningCordappLoader private constructor(private val cordappJarPaths:
                         true
                     }
                 }
+                .filter {
+                    if (blacklistedCordappSigners.isEmpty()) {
+                        true //Nothing blacklisted, no need to check
+                    } else {
+                        val certificates = it.jarPath.openStream().let(::JarInputStream).use(JarSignatureCollector::collectCertificates)
+                        if (certificates.isEmpty() || (certificates - blacklistedCordappSigners).isNotEmpty())
+                            true // Cordapp is not signed or it is signed by at least one non-blacklisted certificate
+                        else {
+                            logger.warn("Not loading CorDapp ${it.info.shortName} (${it.info.vendor}) as it is signed by development key(s) only: " +
+                                    "${certificates.intersect(blacklistedCordappSigners).map { it.publicKey }}.")
+                            false
+                        }
+                    }
+                }
         cordapps.forEach { CordappInfoResolver.register(it.cordappClasses, it.info) }
         return cordapps
     }

node/src/test/kotlin/net/corda/node/internal/cordapp/JarScanningCordappLoaderTest.kt

@@ -6,6 +6,7 @@ import net.corda.core.internal.packageName
 import net.corda.node.VersionInfo
 import net.corda.testing.node.internal.TestCordappDirectories
 import net.corda.testing.node.internal.cordappForPackages
+import net.corda.nodeapi.internal.DEV_CERTIFICATES
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.Test
 import java.nio.file.Paths
@@ -142,4 +143,25 @@ class JarScanningCordappLoaderTest {
         val loader = JarScanningCordappLoader.fromJarUrls(listOf(jar), VersionInfo.UNKNOWN.copy(platformVersion = 2))
         assertThat(loader.cordapps).hasSize(1)
     }
+
+    @Test
+    fun `cordapp classloader loads app signed by allowed certificate`() {
+        val jar = JarScanningCordappLoaderTest::class.java.getResource("signed/signed-by-dev-key.jar")!!
+        val loader = JarScanningCordappLoader.fromJarUrls(listOf(jar), blacklistedCerts = emptyList())
+        assertThat(loader.cordapps).hasSize(1)
+    }
+
+    @Test
+    fun `cordapp classloader does not load app signed by blacklisted certificate`() {
+        val jar = JarScanningCordappLoaderTest::class.java.getResource("signed/signed-by-dev-key.jar")!!
+        val loader = JarScanningCordappLoader.fromJarUrls(listOf(jar), blacklistedCerts = DEV_CERTIFICATES)
+        assertThat(loader.cordapps).hasSize(0)
+    }
+
+    @Test
+    fun `cordapp classloader loads app signed by both allowed and non-blacklisted certificate`() {
+        val jar = JarScanningCordappLoaderTest::class.java.getResource("signed/signed-by-two-keys.jar")!!
+        val loader = JarScanningCordappLoader.fromJarUrls(listOf(jar), blacklistedCerts = DEV_CERTIFICATES)
+        assertThat(loader.cordapps).hasSize(1)
+    }
 }