1 files changed, 145 insertions, 0 deletions
diff --git a/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudDataPlaneFilter.java b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudDataPlaneFilter.java
new file mode 100644
index 00000000000..146b2c0cd23
--- /dev/null
+++ b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudDataPlaneFilter.java
@@ -0,0 +1,145 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.http.filter.security.cloud;
+
+import com.yahoo.component.annotation.Inject;
+import com.yahoo.container.jdisc.AclMapping;
+import com.yahoo.container.jdisc.RequestHandlerSpec;
+import com.yahoo.container.jdisc.RequestView;
+import com.yahoo.jdisc.Response;
+import com.yahoo.jdisc.http.filter.DiscFilterRequest;
+import com.yahoo.jdisc.http.filter.security.base.JsonSecurityRequestFilterBase;
+import com.yahoo.security.X509CertificateUtils;
+
+import java.security.Principal;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.logging.Logger;
+import java.util.stream.Collectors;
+
+import static com.yahoo.jdisc.http.filter.security.cloud.CloudDataPlaneFilter.Permission.READ;
+import static com.yahoo.jdisc.http.filter.security.cloud.CloudDataPlaneFilter.Permission.WRITE;
+
+/**
+ * @author bjorncs
+ */
+public class CloudDataPlaneFilter extends JsonSecurityRequestFilterBase {
+
+    private static final Logger log = Logger.getLogger(CloudDataPlaneFilter.class.getName());
+
+    private final boolean legacyMode;
+    private final List<Client> allowedClients;
+
+    @Inject
+    public CloudDataPlaneFilter(CloudDataPlaneFilterConfig cfg) {
+        this.legacyMode = cfg.legacyMode();
+        if (legacyMode) {
+            allowedClients = List.of();
+            log.fine(() -> "Legacy mode enabled");
+        } else {
+            allowedClients = parseClients(cfg);
+        }
+    }
+
+    private static List<Client> parseClients(CloudDataPlaneFilterConfig cfg) {
+        Set<String> ids = new HashSet<>();
+        List<Client> clients = new ArrayList<>(cfg.clients().size());
+        for (var c : cfg.clients()) {
+            if (ids.contains(c.id()))
+                throw new IllegalArgumentException("Clients definition has duplicate id '%s'".formatted(c.id()));
+            ids.add(c.id());
+            List<X509Certificate> certs;
+            try {
+                certs = c.certificates().stream().map(X509CertificateUtils::fromPem).toList();
+            } catch (Exception e) {
+                throw new IllegalArgumentException(
+                        "Client '%s' contains invalid X.509 certificate PEM: %s".formatted(c.id(), e.toString()), e);
+            }
+            EnumSet<Permission> permissions = c.permissions().stream().map(Permission::of)
+                    .collect(Collectors.toCollection(() -> EnumSet.noneOf(Permission.class)));
+            clients.add(new Client(c.id(), permissions, certs));
+        }
+        if (clients.isEmpty()) throw new IllegalArgumentException("Empty clients configuration");
+        log.fine(() -> "Configured clients with ids %s".formatted(ids));
+        return clients;
+    }
+
+    @Override
+    protected Optional<ErrorResponse> filter(DiscFilterRequest req) {
+        var certs = req.getClientCertificateChain();
+        log.fine(() -> "Certificate chain contains %d elements".formatted(certs.size()));
+        if (certs.isEmpty()) {
+            log.fine("Missing client certificate");
+            return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, "Unauthorized"));
+        }
+        if (legacyMode) {
+            log.fine("Legacy mode validation complete");
+            req.setUserPrincipal(new ClientPrincipal(Set.of(), Set.of(READ, WRITE)));
+            return Optional.empty();
+        }
+        RequestView view = req.asRequestView();
+        var permission = Optional.ofNullable((RequestHandlerSpec) req.getAttribute(RequestHandlerSpec.ATTRIBUTE_NAME))
+                .or(() -> Optional.of(RequestHandlerSpec.DEFAULT_INSTANCE))
+                .flatMap(spec -> {
+                    var action = spec.aclMapping().get(view);
+                    var maybePermission = Permission.of(action);
+                    if (maybePermission.isEmpty()) log.fine(() -> "Unknown action '%s'".formatted(action));
+                    return maybePermission;
+                 }).orElse(null);
+        if (permission == null) {
+            log.fine(() -> "No valid permission mapping defined for %s @ '%s'".formatted(view.method(), view.uri()));
+            return Optional.of(new ErrorResponse(Response.Status.FORBIDDEN, "Forbidden"));
+        }
+        var clientCert = certs.get(0);
+        var clientIds = new TreeSet<String>();
+        var permissions = new TreeSet<Permission>();
+        for (Client c : allowedClients) {
+            if (c.permissions().contains(permission) && c.certificates().contains(clientCert)) {
+                clientIds.add(c.id());
+                permissions.addAll(c.permissions());
+            }
+        }
+        log.fine(() -> "Client with ids=%s, permissions=%s"
+                .formatted(clientIds, permissions.stream().map(Permission::asString).toList()));
+        if (clientIds.isEmpty()) return Optional.of(new ErrorResponse(Response.Status.FORBIDDEN, "Forbidden"));
+        req.setUserPrincipal(new ClientPrincipal(clientIds, permissions));
+        return Optional.empty();
+    }
+
+    public record ClientPrincipal(Set<String> ids, Set<Permission> permissions) implements Principal {
+        public ClientPrincipal { ids = Set.copyOf(ids); permissions = Set.copyOf(permissions); }
+        @Override public String getName() {
+            return "ids=%s,permissions=%s".formatted(ids, permissions.stream().map(Permission::asString).toList());
+        }
+    }
+
+    enum Permission { READ, WRITE;
+        String asString() {
+            return switch (this) {
+                case READ -> "read";
+                case WRITE -> "write";
+            };
+        }
+        static Permission of(String v) {
+            return switch (v) {
+                case "read" -> READ;
+                case "write" -> WRITE;
+                default -> throw new IllegalArgumentException("Invalid permission '%s'".formatted(v));
+            };
+        }
+        static Optional<Permission> of(AclMapping.Action a) {
+            if (a.equals(AclMapping.Action.READ)) return Optional.of(READ);
+            if (a.equals(AclMapping.Action.WRITE)) return Optional.of(WRITE);
+            return Optional.empty();
+        }
+    }
+
+    private record Client(String id, EnumSet<Permission> permissions, List<X509Certificate> certificates) {
+        Client { permissions = EnumSet.copyOf(permissions); certificates = List.copyOf(certificates); }
+    }
+}