com.hierynomus.mssmb2.messages.SMB2NegotiateResponse Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of smbj Show documentation
SMB2 protocol library for communication with Windows servers
There is a newer version: 0.13.0
/*
 * Copyright (C)2016 - SMBJ Contributors
 *
 * 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 com.hierynomus.mssmb2.messages;

import com.hierynomus.msdtyp.FileTime;
import com.hierynomus.msdtyp.MsDataTypes;
import com.hierynomus.mssmb2.SMB2Dialect;
import com.hierynomus.mssmb2.SMB2GlobalCapability;
import com.hierynomus.mssmb2.SMB2Packet;
import com.hierynomus.mssmb2.messages.negotiate.SMB2NegotiateContext;
import com.hierynomus.protocol.commons.EnumWithValue;
import com.hierynomus.protocol.commons.buffer.Buffer;
import com.hierynomus.smb.SMBBuffer;

import java.util.*;

/**
 * [MS-SMB2].pdf 2.2.4 SMB2 Negotiate Response
 */
public class SMB2NegotiateResponse extends SMB2Packet {

    private int securityMode;
    private SMB2Dialect dialect;
    private UUID serverGuid;
    private Set capabilities = EnumSet.noneOf(SMB2GlobalCapability.class);
    private int maxTransactSize;
    private int maxReadSize;
    private int maxWriteSize;
    private FileTime systemTime;
    private FileTime serverStartTime;
    private byte[] gssToken;
    private List negotiateContextList;

    @Override
    protected void readMessage(SMBBuffer buffer) throws Buffer.BufferException {
        buffer.skip(2); // StructureSize (2 bytes)
        securityMode = buffer.readUInt16(); // SecurityMode (2 bytes)
        dialect = SMB2Dialect.lookup(buffer.readUInt16()); // DialectRevision (2 bytes)
        int negotiateContextCount = readNegotiateContextCount(buffer); // NegotiateContextCount/Reserved (2 bytes)
        serverGuid = MsDataTypes.readGuid(buffer); // ServerGuid (16 bytes)
        capabilities = EnumWithValue.EnumUtils.toEnumSet(buffer.readUInt32(), SMB2GlobalCapability.class); // Capabilities (4 bytes)
        maxTransactSize = buffer.readUInt32AsInt(); // MaxTransactSize (4 bytes)
        maxReadSize = buffer.readUInt32AsInt(); // MaxReadSize (4 bytes)
        maxWriteSize = buffer.readUInt32AsInt(); // MaxWriteSize (4 bytes)
        systemTime = MsDataTypes.readFileTime(buffer); // SystemTime (8 bytes)
        serverStartTime = MsDataTypes.readFileTime(buffer); // ServerStartDate (8 bytes)
        int securityBufferOffset = buffer.readUInt16(); // SecurityBufferOffset (2 bytes)
        int securityBufferLength = buffer.readUInt16(); // SecurityBufferLength (2 bytes)
        int negotiateContextOffset = readNegotiateContextOffset(buffer); // NegotiateContextOffset/Reserved (2 bytes)
        gssToken = readSecurityBuffer(buffer, securityBufferOffset, securityBufferLength);
        this.negotiateContextList = readNegotiateContextList(buffer, negotiateContextOffset, negotiateContextCount);
    }

    private List readNegotiateContextList(SMBBuffer buffer, int negotiateContextOffset, @SuppressWarnings("unused") int negotiateContextCount) {
        if (dialect == SMB2Dialect.SMB_3_1_1) {
            buffer.rpos(negotiateContextOffset);
            try {
                List negotiateContextList = new ArrayList<>();
                for (int i = 0; i < negotiateContextCount; i++) {
                    // parse the negotiateContext
                    SMB2NegotiateContext negotiateContext = SMB2NegotiateContext.factory(buffer);
                    // add the parsed negotiateContext to list
                    negotiateContextList.add(negotiateContext);
                }
                return negotiateContextList;
            } catch (Buffer.BufferException e) {
                // FIXME fix this issue
                throw new IllegalArgumentException("unknown error when parse negotiateContext", e);
            }
        } else {
            return Collections.emptyList();
        }
    }

    private byte[] readSecurityBuffer(SMBBuffer buffer, int securityBufferOffset, int securityBufferLength) throws Buffer.BufferException {
        if (securityBufferLength > 0) {
            // Set the read pos to the start of the security buffer offset.
            buffer.rpos(securityBufferOffset);
            return buffer.readRawBytes(securityBufferLength);
        } else {
            return new byte[0];
        }
    }

    private int readNegotiateContextOffset(SMBBuffer buffer) throws Buffer.BufferException {
        if (dialect == SMB2Dialect.SMB_3_1_1) {
            return buffer.readUInt16();
        } else {
            buffer.skip(2);
            return 0;
        }
    }

    private int readNegotiateContextCount(Buffer buffer) throws Buffer.BufferException {
        if (dialect == SMB2Dialect.SMB_3_1_1) {
            return buffer.readUInt16();
        } else {
            buffer.skip(2);
            return 0;
        }
    }

    public byte[] getGssToken() {
        return gssToken;
    }

    public int getSecurityMode() {
        return securityMode;
    }

    public SMB2Dialect getDialect() {
        return dialect;
    }

    public UUID getServerGuid() {
        return serverGuid;
    }

    public Set getCapabilities() {
        return capabilities;
    }

    public int getMaxTransactSize() {
        return maxTransactSize;
    }

    public int getMaxReadSize() {
        return maxReadSize;
    }

    public int getMaxWriteSize() {
        return maxWriteSize;
    }

    public FileTime getSystemTime() {
        return systemTime;
    }

    public FileTime getServerStartTime() {
        return serverStartTime;
    }

    public List getNegotiateContextList() {
        return negotiateContextList;
    }
}