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/* Copyright 2012 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <boost/scoped_array.hpp>
#include <sasl/sasl.h>
#include <string>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
namespace mongo {
/**
* Implementation of the client side of a SASL authentication conversation.
*
* To use, create an instance, then use setParameter() to configure the authentication
* parameters. Once all parameters are set, call initialize() to initialize the client state
* machine. Finally, use repeated calls to step() to generate messages to send to the server
* and process server responses.
*
* The required parameters vary by mechanism, but all mechanisms require parameterServiceName,
* parameterServiceHostname, parameterMechanism and parameterUser. All of the required
* parameters must be UTF-8 encoded strings with no embedded NUL characters. The
* parameterPassword parameter is not constrained.
*/
class SaslClientSession {
MONGO_DISALLOW_COPYING(SaslClientSession);
public:
/**
* Identifiers of parameters used to configure a SaslClientSession.
*/
enum Parameter {
parameterServiceName = 0,
parameterServiceHostname,
parameterMechanism,
parameterUser,
parameterPassword,
numParameters // Must be last
};
SaslClientSession();
~SaslClientSession();
/**
* Sets the parameter identified by "id" to "value".
*
* The value of "id" must be one of the legal values of Parameter less than numParameters.
* May be called repeatedly for the same value of "id", with the last "value" replacing
* previous values.
*
* The session object makes and owns a copy of the data in "value".
*/
void setParameter(Parameter id, const StringData& value);
/**
* Returns true if "id" identifies a parameter previously set by a call to setParameter().
*/
bool hasParameter(Parameter id);
/**
* Returns the value of a previously set parameter.
*
* If parameter "id" was never set, returns an empty StringData. Note that a parameter may
* be explicitly set to StringData(), so use hasParameter() to distinguish those cases.
*
* The session object owns the storage behind the returned StringData, which will remain
* valid until setParameter() is called with the same value of "id", or the session object
* goes out of scope.
*/
StringData getParameter(Parameter id);
/**
* Returns the value of the parameterPassword parameter in the form of a sasl_secret_t, used
* by the Cyrus SASL library's SASL_CB_PASS callback. The session object owns the storage
* referenced by the returned sasl_secret_t*, which will remain in scope according to the
* same rules as given for getParameter(), above.
*/
sasl_secret_t* getPasswordAsSecret();
/**
* Initializes a session for use.
*
* Call exactly once, after setting any parameters you intend to set via setParameter().
*/
Status initialize();
/**
* Takes one step of the SASL protocol on behalf of the client.
*
* Caller should provide data from the server side of the conversation in "inputData", or an
* empty StringData() if none is available. If the client should make a response to the
* server, stores the response into "*outputData".
*
* Returns Status::OK() on success. Any other return value indicates a failed
* authentication, though the specific return value may provide insight into the cause of
* the failure (e.g., ProtocolError, AuthenticationFailed).
*
* In the event that this method returns Status::OK(), consult the value of isDone() to
* determine if the conversation has completed. When step() returns Status::OK() and
* isDone() returns true, authentication has completed successfully.
*/
Status step(const StringData& inputData, std::string* outputData);
/**
* Returns true if the authentication completed successfully.
*/
bool isDone() const { return _done; }
private:
/**
* Buffer object that owns data for a single parameter.
*/
struct DataBuffer {
boost::scoped_array<char> data;
size_t size;
};
/// Maximum number of Cyrus SASL callbacks stored in _callbacks.
static const int maxCallbacks = 4;
/// Underlying Cyrus SASL library connection object.
sasl_conn_t* _saslConnection;
/// Callbacks registered on _saslConnection for providing the Cyrus SASL library with
/// parameter values, etc.
sasl_callback_t _callbacks[maxCallbacks];
/// Buffers for each of the settable parameters.
DataBuffer _parameters[numParameters];
/// Number of successfully completed conversation steps.
int _step;
/// See isDone().
bool _done;
};
} // namespace mongo
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