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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_CREDENTIALS_H
#define GRPCXX_CREDENTIALS_H
#include <map>
#include <memory>
#include <grpc++/impl/grpc_library.h>
#include <grpc++/support/config.h>
#include <grpc++/support/status.h>
#include <grpc++/support/string_ref.h>
namespace grpc {
class ChannelArguments;
class Channel;
class SecureChannelCredentials;
class CallCredentials;
class SecureCallCredentials;
/// A channel credentials object encapsulates all the state needed by a client
/// to authenticate with a server for a given channel.
/// It can make various assertions, e.g., about the client’s identity, role
/// for all the calls on that channel.
///
/// \see https://github.com/grpc/grpc/blob/master/doc/grpc-auth-support.md
class ChannelCredentials : public GrpcLibrary {
public:
~ChannelCredentials() GRPC_OVERRIDE;
protected:
friend std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
const std::shared_ptr<ChannelCredentials>& channel_creds,
const std::shared_ptr<CallCredentials>& call_creds);
virtual SecureChannelCredentials* AsSecureCredentials() = 0;
private:
friend std::shared_ptr<Channel> CreateCustomChannel(
const grpc::string& target,
const std::shared_ptr<ChannelCredentials>& creds,
const ChannelArguments& args);
virtual std::shared_ptr<Channel> CreateChannel(
const grpc::string& target, const ChannelArguments& args) = 0;
};
/// A call credentials object encapsulates the state needed by a client to
/// authenticate with a server for a given call on a channel.
///
/// \see https://github.com/grpc/grpc/blob/master/doc/grpc-auth-support.md
class CallCredentials : public GrpcLibrary {
public:
~CallCredentials() GRPC_OVERRIDE;
/// Apply this instance's credentials to \a call.
virtual bool ApplyToCall(grpc_call* call) = 0;
protected:
friend std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
const std::shared_ptr<ChannelCredentials>& channel_creds,
const std::shared_ptr<CallCredentials>& call_creds);
friend std::shared_ptr<CallCredentials> CompositeCallCredentials(
const std::shared_ptr<CallCredentials>& creds1,
const std::shared_ptr<CallCredentials>& creds2);
virtual SecureCallCredentials* AsSecureCredentials() = 0;
};
/// Options used to build SslCredentials.
struct SslCredentialsOptions {
/// The buffer containing the PEM encoding of the server root certificates. If
/// this parameter is empty, the default roots will be used. The default
/// roots can be overridden using the \a GRPC_DEFAULT_SSL_ROOTS_FILE_PATH
/// environment variable pointing to a file on the file system containing the
/// roots.
grpc::string pem_root_certs;
/// The buffer containing the PEM encoding of the client's private key. This
/// parameter can be empty if the client does not have a private key.
grpc::string pem_private_key;
/// The buffer containing the PEM encoding of the client's certificate chain.
/// This parameter can be empty if the client does not have a certificate
/// chain.
grpc::string pem_cert_chain;
};
// Factories for building different types of Credentials The functions may
// return empty shared_ptr when credentials cannot be created. If a
// Credentials pointer is returned, it can still be invalid when used to create
// a channel. A lame channel will be created then and all rpcs will fail on it.
/// Builds credentials with reasonable defaults.
///
/// \warning Only use these credentials when connecting to a Google endpoint.
/// Using these credentials to connect to any other service may result in this
/// service being able to impersonate your client for requests to Google
/// services.
std::shared_ptr<ChannelCredentials> GoogleDefaultCredentials();
/// Builds SSL Credentials given SSL specific options
std::shared_ptr<ChannelCredentials> SslCredentials(
const SslCredentialsOptions& options);
/// Builds credentials for use when running in GCE
///
/// \warning Only use these credentials when connecting to a Google endpoint.
/// Using these credentials to connect to any other service may result in this
/// service being able to impersonate your client for requests to Google
/// services.
std::shared_ptr<CallCredentials> GoogleComputeEngineCredentials();
/// Builds Service Account JWT Access credentials.
/// json_key is the JSON key string containing the client's private key.
/// token_lifetime_seconds is the lifetime in seconds of each Json Web Token
/// (JWT) created with this credentials. It should not exceed
/// grpc_max_auth_token_lifetime or will be cropped to this value.
std::shared_ptr<CallCredentials> ServiceAccountJWTAccessCredentials(
const grpc::string& json_key, long token_lifetime_seconds);
/// Builds refresh token credentials.
/// json_refresh_token is the JSON string containing the refresh token along
/// with a client_id and client_secret.
///
/// \warning Only use these credentials when connecting to a Google endpoint.
/// Using these credentials to connect to any other service may result in this
/// service being able to impersonate your client for requests to Google
/// services.
std::shared_ptr<CallCredentials> GoogleRefreshTokenCredentials(
const grpc::string& json_refresh_token);
/// Builds access token credentials.
/// access_token is an oauth2 access token that was fetched using an out of band
/// mechanism.
///
/// \warning Only use these credentials when connecting to a Google endpoint.
/// Using these credentials to connect to any other service may result in this
/// service being able to impersonate your client for requests to Google
/// services.
std::shared_ptr<CallCredentials> AccessTokenCredentials(
const grpc::string& access_token);
/// Builds IAM credentials.
///
/// \warning Only use these credentials when connecting to a Google endpoint.
/// Using these credentials to connect to any other service may result in this
/// service being able to impersonate your client for requests to Google
/// services.
std::shared_ptr<CallCredentials> GoogleIAMCredentials(
const grpc::string& authorization_token,
const grpc::string& authority_selector);
/// Combines a channel credentials and a call credentials into a composite
/// channel credentials.
std::shared_ptr<ChannelCredentials> CompositeChannelCredentials(
const std::shared_ptr<ChannelCredentials>& channel_creds,
const std::shared_ptr<CallCredentials>& call_creds);
/// Combines two call credentials objects into a composite call credentials.
std::shared_ptr<CallCredentials> CompositeCallCredentials(
const std::shared_ptr<CallCredentials>& creds1,
const std::shared_ptr<CallCredentials>& creds2);
/// Credentials for an unencrypted, unauthenticated channel
std::shared_ptr<ChannelCredentials> InsecureChannelCredentials();
// User defined metadata credentials.
class MetadataCredentialsPlugin {
public:
virtual ~MetadataCredentialsPlugin() {}
// If this method returns true, the Process function will be scheduled in
// a different thread from the one processing the call.
virtual bool IsBlocking() const { return true; }
// Gets the auth metatada produced by this plugin.
virtual Status GetMetadata(
grpc::string_ref service_url,
std::multimap<grpc::string, grpc::string>* metadata) = 0;
};
std::shared_ptr<CallCredentials> MetadataCredentialsFromPlugin(
std::unique_ptr<MetadataCredentialsPlugin> plugin);
} // namespace grpc
#endif // GRPCXX_CREDENTIALS_H
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