Support Kerberos on Android

net/android/http_auth_negotiate_android.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_ANDROID_HTTP_AUTH_NEGOTIATE_ANDROID_H_
+#define NET_ANDROID_HTTP_AUTH_NEGOTIATE_ANDROID_H_
+
+#include <jni.h>
+#include <string>
+
+#include "base/android/jni_android.h"
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/completion_callback.h"
+#include "net/http/http_auth.h"
+
+namespace net {
+
+class HttpAuthChallengeTokenizer;
+
+namespace android {
+
+// This class provides a threadsafe wrapper for SetResult, which is called from
+// Java. A new instance of this class is needed for each call, and the instance
+// destroys itself when the callback is received. It is written to allow
+// setResult to be called on any thread, but in practice they will be called
+// on the application's main thread.
+//
+// We cannot use a Callback object here, because there is no way of invoking the
+// Run method from Java.
+class NET_EXPORT_PRIVATE JavaNegotiateResultWrapper {
+ public:
+  scoped_refptr<base::TaskRunner> callback_task_runner_;
+  base::Callback<void(int, const std::string&)> thread_safe_callback_;
+
+  JavaNegotiateResultWrapper(
+      const scoped_refptr<base::TaskRunner>& callback_task_runner,
+      const base::Callback<void(int, const std::string&)>&
+          thread_safe_callback);
+
+  void SetResult(JNIEnv* env, jobject obj, int result, jstring token);
+
+ private:
+  // Class is only allowed to delete itself, nobody else is allowed to delete.
+  ~JavaNegotiateResultWrapper();
+};
+
+// Class providing Negotiate (SPNEGO/Kerberos) authentication support on
+// Android. The actual authentication is done through an Android authenticator
+// provided by third parties who want Kerberos support. This class simply
+// provides a bridge to the Java code, and hence to the service. See
+// https://drive.google.com/open?id=1G7WAaYEKMzj16PTHT_cIYuKXJG6bBcrQ7QQBQ6ihOcQ&authuser=1
+// for the full details.
+class NET_EXPORT_PRIVATE HttpAuthNegotiateAndroid {
+ public:
+  // Creates an object for one negotiation session. |account_type| is the
+  // Android account type, used by Android to find the correct authenticator.
+  explicit HttpAuthNegotiateAndroid(const std::string& account_type);
+  ~HttpAuthNegotiateAndroid();
+
+  // Register the JNI for this class.
+  static bool Register(JNIEnv* env);
+
+  // Does nothing, but needed for compatibility with the Negotiate
+  // authenticators for other O.S.. Always returns true.
+  bool Init();
+
+  // True if authentication needs the identity of the user from Chrome.
+  bool NeedsIdentity() const;
+
+  // True authentication can use explicit credentials included in the URL.
+  bool AllowsExplicitCredentials() const;
+
+  // Parse a received Negotiate challenge.
+  HttpAuth::AuthorizationResult ParseChallenge(
+      net::HttpAuthChallengeTokenizer* tok);
+
+  // Generates an authentication token.
+  //
+  // The return value is an error code. The authentication token will be
+  // returned in |*auth_token|. If the result code is not |OK|, the value of
+  // |*auth_token| is unspecified.
+  //
+  // If the operation cannot be completed synchronously, |ERR_IO_PENDING| will
+  // be returned and the real result code will be passed to the completion
+  // callback.  Otherwise the result code is returned immediately from this
+  // call.
+  //
+  // If the AndroidAuthNegotiate object is deleted before completion then the
+  // callback will not be called.
+  //
+  // If no immediate result is returned then |auth_token| must remain valid
+  // until the callback has been called.
+  //
+  // |spn| is the Service Principal Name of the server that the token is
+  // being generated for.
+  //
+  // If this is the first round of a multiple round scheme, credentials are
+  // obtained using |*credentials|. If |credentials| is NULL, the default
+  // credentials are used instead.
+  int GenerateAuthToken(const AuthCredentials* credentials,
+                        const std::string& spn,
+                        std::string* auth_token,
+                        const net::CompletionCallback& callback);
+
+  // Delegation is allowed on the Kerberos ticket. This allows certain servers
+  // to act as the user, such as an IIS server retrieving data from a
+  // Kerberized MSSQL server.
+  void Delegate();
+
+ private:
+  void SetResultInternal(int result, const std::string& token);
+
+  std::string account_type_;
+  bool can_delegate_;
+  bool first_challenge_;
+  std::string server_auth_token_;
+  std::string* auth_token_;
+  base::android::ScopedJavaGlobalRef<jobject> java_authenticator_;
+  net::CompletionCallback completion_callback_;
+
+  base::WeakPtrFactory<HttpAuthNegotiateAndroid> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(HttpAuthNegotiateAndroid);
+};
+
+}  // namespace android
+}  // namespace net
+
+#endif  // NET_ANDROID_HTTP_AUTH_NEGOTIATE_ANDROID_H_