1 files changed, 148 insertions, 0 deletions
diff --git a/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudTokenDataPlaneFilter.java b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudTokenDataPlaneFilter.java
new file mode 100644
index 00000000000..582aa2c8aee
--- /dev/null
+++ b/jdisc-security-filters/src/main/java/com/yahoo/jdisc/http/filter/security/cloud/CloudTokenDataPlaneFilter.java
@@ -0,0 +1,148 @@
+// 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.logging.AccessLogEntry;
+import com.yahoo.jdisc.Response;
+import com.yahoo.jdisc.http.filter.DiscFilterRequest;
+import com.yahoo.jdisc.http.filter.security.base.JsonSecurityRequestFilterBase;
+import com.yahoo.jdisc.http.filter.security.cloud.config.CloudTokenDataPlaneFilterConfig;
+import com.yahoo.security.token.Token;
+import com.yahoo.security.token.TokenCheckHash;
+import com.yahoo.security.token.TokenDomain;
+import com.yahoo.security.token.TokenFingerprint;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.logging.Logger;
+
+import static com.yahoo.jdisc.http.server.jetty.AccessLoggingRequestHandler.CONTEXT_KEY_ACCESS_LOG_ENTRY;
+
+/**
+ * Token data plane filter for Cloud
+ *
+ * @author bjorncs
+ */
+public class CloudTokenDataPlaneFilter extends JsonSecurityRequestFilterBase {
+
+    private static final Logger log = Logger.getLogger(CloudTokenDataPlaneFilter.class.getName());
+    static final int CHECK_HASH_BYTES = 32;
+
+    private final List<Client> allowedClients;
+    private final TokenDomain tokenDomain;
+    private final Clock clock;
+
+    @Inject
+    public CloudTokenDataPlaneFilter(CloudTokenDataPlaneFilterConfig cfg) {
+        this(cfg, Clock.systemUTC());
+    }
+
+    CloudTokenDataPlaneFilter(CloudTokenDataPlaneFilterConfig cfg, Clock clock) {
+        this.tokenDomain = TokenDomain.of(cfg.tokenContext());
+        this.clock = clock;
+        this.allowedClients = parseClients(cfg);
+    }
+
+    private static List<Client> parseClients(CloudTokenDataPlaneFilterConfig cfg) {
+        Set<String> ids = new HashSet<>();
+        List<Client> clients = new ArrayList<>(cfg.clients().size());
+        if (cfg.clients().isEmpty()) throw new IllegalArgumentException("Empty clients configuration");
+        for (var c : cfg.clients()) {
+            if (ids.contains(c.id()))
+                throw new IllegalArgumentException("Clients definition has duplicate id '%s'".formatted(c.id()));
+            if (c.tokens().isEmpty())
+                throw new IllegalArgumentException("Client '%s' has no tokens configured".formatted(c.id()));
+            ids.add(c.id());
+            var tokens = new HashMap<TokenCheckHash, TokenVersion>();
+            for (var token : c.tokens()) {
+                for (int version = 0; version < token.checkAccessHashes().size(); version++) {
+                    var tokenVersion = TokenVersion.of(
+                            token.id(), token.fingerprints().get(version), token.checkAccessHashes().get(version),
+                            token.expirations().get(version));
+                    tokens.put(tokenVersion.accessHash(), tokenVersion);
+                }
+            }
+            clients.add(new Client(c.id(), Permission.setOf(c.permissions()), tokens));
+        }
+        log.fine(() -> "Configured clients with ids %s".formatted(ids));
+        return List.copyOf(clients);
+    }
+
+    @Override
+    protected Optional<ErrorResponse> filter(DiscFilterRequest req) {
+        var now = clock.instant();
+        var bearerToken = requestBearerToken(req).orElse(null);
+        if (bearerToken == null) {
+            log.fine("Missing bearer token");
+            return Optional.of(new ErrorResponse(Response.Status.UNAUTHORIZED, "Unauthorized"));
+        }
+        var permission = Permission.getRequiredPermission(req).orElse(null);
+        if (permission == null) return Optional.of(new ErrorResponse(Response.Status.FORBIDDEN, "Forbidden"));
+        var requestTokenHash = requestTokenHash(bearerToken);
+        var clientIds = new TreeSet<String>();
+        var permissions = new TreeSet<Permission>();
+        var matchedTokens = new HashSet<TokenVersion>();
+        for (Client c : allowedClients) {
+            if (!c.permissions().contains(permission)) continue;
+            var matchedToken  = c.tokens().get(requestTokenHash);
+            if (matchedToken == null) continue;
+            var expiration = matchedToken.expiration().orElse(null);
+            if (expiration != null && now.isAfter(expiration)) continue;
+            matchedTokens.add(matchedToken);
+            clientIds.add(c.id());
+            permissions.addAll(c.permissions());
+        }
+        if (clientIds.isEmpty()) return Optional.of(new ErrorResponse(Response.Status.FORBIDDEN, "Forbidden"));
+        if (matchedTokens.size() > 1) {
+            log.warning("Multiple tokens matched for request %s"
+                                .formatted(matchedTokens.stream().map(TokenVersion::id).toList()));
+            return Optional.of(new ErrorResponse(Response.Status.FORBIDDEN, "Forbidden"));
+        }
+        var matchedToken = matchedTokens.stream().findAny().orElse(null);
+        if (matchedToken != null) {
+            addAccessLogEntry(req, "token.id", matchedToken.id());
+            addAccessLogEntry(req, "token.hash", matchedToken.fingerprint().toDelimitedHexString());
+            addAccessLogEntry(req, "token.exp", matchedToken.expiration().map(Instant::toString).orElse("<none>"));
+        }
+        ClientPrincipal.createForRequest(req, clientIds, permissions);
+        return Optional.empty();
+    }
+
+    private TokenCheckHash requestTokenHash(String bearerToken) {
+        return TokenCheckHash.of(Token.of(tokenDomain, bearerToken), CHECK_HASH_BYTES);
+    }
+
+    private static Optional<String> requestBearerToken(DiscFilterRequest req) {
+        return Optional.ofNullable(req.getHeader("Authorization"))
+                .filter(h -> h.startsWith("Bearer "))
+                .map(t -> t.substring("Bearer ".length()).trim())
+                .filter(t -> !t.isBlank());
+
+    }
+
+    private static void addAccessLogEntry(DiscFilterRequest req, String key, String value) {
+        ((AccessLogEntry) req.getAttribute(CONTEXT_KEY_ACCESS_LOG_ENTRY)).addKeyValue(key, value);
+    }
+
+    private record TokenVersion(String id, TokenFingerprint fingerprint, TokenCheckHash accessHash, Optional<Instant> expiration) {
+        static TokenVersion of(String id, String fingerprint, String accessHash, String expiration) {
+            return new TokenVersion(id, TokenFingerprint.ofHex(fingerprint), TokenCheckHash.ofHex(accessHash),
+                                    expiration.equals("<none>") ? Optional.empty() : Optional.of(Instant.parse(expiration)));
+        }
+    }
+
+    private record Client(String id, EnumSet<Permission> permissions, Map<TokenCheckHash, TokenVersion> tokens) {
+        Client {
+            permissions = EnumSet.copyOf(permissions); tokens = Map.copyOf(tokens);
+        }
+    }
+}