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/*_############################################################################
_##
_## SNMP4J-Agent - VACM.java
_##
_## Copyright (C) 2005-2009 Frank Fock (SNMP4J.org)
_##
_## 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.
_##
_##########################################################################*/
package org.snmp4j.agent.security;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.OID;
// for JavaDoc
import org.snmp4j.security.SecurityModel;
import org.snmp4j.security.SecurityLevel;
/**
* The View-based Access Control Model interface defines methods and constants
* that a contrete implementation of such a model has to implement.
* An example of such a concrete implementation is defined by RFC 3415 and
* implemented by the VacmMIB class.
*
* @author Frank Fock
* @version 1.0
*/
public interface VACM {
int VIEW_NOTIFY = 0;
int VIEW_READ = 1;
int VIEW_WRITE = 2;
int VACM_OK = 0;
int VACM_NOT_IN_VIEW = 1;
int VACM_NO_SUCH_VIEW = 2;
int VACM_NO_SUCH_CONTEXT = 3;
int VACM_NO_GROUP_NAME = 4;
int VACM_NO_ACCESS_ENTRY = 5;
int VACM_OTHER_ERROR = 6;
/**
* Checks whether access is allowed in the specified context for the security
* name, model, level, and view type for the supplied OID.
* @param context
* the context for which access is requested.
* @param securityName
* the security name.
* @param securityModel
* the security model, see {@link SecurityModel} for possible values.
* @param securityLevel
* the security level, see {@link SecurityLevel} for possible values.
* @param viewType
* the requested view type, possible values are {@link #VIEW_NOTIFY},
* {@link #VIEW_READ}, and {@link #VIEW_WRITE}.
* @param oid
* the OID of the object instance for which access is requested.
* @return
* {@link #VACM_OK} if access is granted or one of the VACM errors defined
* by this interface if access is rejected.
*/
int isAccessAllowed(OctetString context,
OctetString securityName,
int securityModel,
int securityLevel,
int viewType,
OID oid);
/**
* Checks if access is allowed for the given OID within the specified view.
* @param viewName
* the name of an existing view, i.e. that has bee retrieved by
* {@link #getViewName} before.
* @param oid
* the OID of the object instance for which access is requested.
* @return
* {@link #VACM_OK} if access is granted or one of the VACM errors defined
* by this interface if access is rejected.
*/
int isAccessAllowed(OctetString viewName, OID oid);
/**
* Gets the view name of the view defined by the supplied credentials.
* @param context
* the context for which access is requested.
* @param securityName
* the security name.
* @param securityModel
* the security model, see {@link SecurityModel} for possible values.
* @param securityLevel
* the security level, see {@link SecurityLevel} for possible values.
* @param viewType
* the requested view type, possible values are {@link #VIEW_NOTIFY},
* {@link #VIEW_READ}, and {@link #VIEW_WRITE}.
* @return
* the view name if the credentials can be mapped to an existing view.
* Otherwise, if no such view exists then null is returned.
*/
OctetString getViewName(OctetString context,
OctetString securityName,
int securityModel,
int securityLevel,
int viewType);
}
