com.hierynomus.mssmb2.messages.SMB2SessionSetup 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.mserref.NtStatus;
import com.hierynomus.mssmb2.*;
import com.hierynomus.protocol.commons.EnumWithValue;
import com.hierynomus.protocol.commons.buffer.Buffer;
import com.hierynomus.smb.SMBBuffer;

import java.util.Set;

import static com.hierynomus.protocol.commons.EnumWithValue.EnumUtils.toEnumSet;

/**
 * [MS-SMB2].pdf 2.2.5 SMB2_SESSION_SETUP Request / 2.2.6 SMB2_SESSION_SETUP Response
 */
public class SMB2SessionSetup extends SMB2Packet {

    private SMB2Dialect negotiatedDialect;
    private byte securityMode;
    private long clientCapabilities;
    private byte[] securityBuffer;
    private long previousSessionId;

    private Set sessionFlags;

    public SMB2SessionSetup() {
    }

    public SMB2SessionSetup(SMB2Dialect negotiatedDialect, Set securityMode,
            Set capabilities) {
        super(25, negotiatedDialect, SMB2MessageCommandCode.SMB2_SESSION_SETUP);
        this.negotiatedDialect = negotiatedDialect;
        this.securityMode = (byte) EnumWithValue.EnumUtils.toLong(securityMode);
        this.clientCapabilities = EnumWithValue.EnumUtils.toLong(capabilities);
    }

    @Override
    protected void writeTo(SMBBuffer buffer) {
        buffer.putUInt16(structureSize); // StructureSize (2 bytes)
        putFlags(buffer); // Flags (1 byte)
        buffer.putByte(securityMode); // SecurityMode (1 byte)
        buffer.putUInt32(clientCapabilities & 0x01); // Capabilities (4 bytes) (only last byte can be set)
        buffer.putReserved4(); // Channel (4 bytes)
        buffer.putUInt16(SMB2Header.STRUCTURE_SIZE + 25 - 1); // SecurityBufferOffset (2 bytes) (header structure size + Session setup structure size - 1)
        buffer.putUInt16((securityBuffer != null) ? securityBuffer.length : 0); // SecurityBufferLength (2 bytes)
        buffer.putUInt64(previousSessionId); // PreviousSessionId (8 bytes)
        if (securityBuffer != null) {
            buffer.putRawBytes(securityBuffer); // SecurityBuffer (variable)
        }
    }

    @Override
    protected void readMessage(SMBBuffer buffer) throws Buffer.BufferException {
        buffer.readUInt16(); // StructureSize (2 bytes) (always 9)
        sessionFlags = toEnumSet(buffer.readUInt16(), SMB2SessionFlags.class); // SessionFlags (2 bytes)
        int securityBufferOffset = buffer.readUInt16(); // SecurityBufferOffset (2 bytes)
        int securityBufferLength = buffer.readUInt16(); // SecurityBufferLength (2 bytes)
        securityBuffer = readSecurityBuffer(buffer, securityBufferOffset, securityBufferLength); // SecurityBuffer (variable)
    }

    /**
     * [MS-SMB2].pdf 3.3.4.4
     * STATUS_MORE_PROCESSING_REQUIRED should be treated as a success code.
     * @param status The status to verify
     * @return
     */
    @Override
    protected boolean isSuccess(NtStatus status) {
        return super.isSuccess(status) || status == NtStatus.STATUS_MORE_PROCESSING_REQUIRED;
    }

    private byte[] readSecurityBuffer(SMBBuffer buffer, int securityBufferOffset, int securityBufferLength) throws Buffer.BufferException {
        if (securityBufferLength > 0) {
            // Just to be sure, we should already be there.
            buffer.rpos(securityBufferOffset);
            return buffer.readRawBytes(securityBufferLength);
        } else {
            return new byte[0];
//        throw new SMBRuntimeException("The SMB2 Session Setup response should contain a positive length security buffer");
        }
    }

    private void putFlags(SMBBuffer buffer) {
        if (negotiatedDialect.isSmb3x() && previousSessionId != 0L) {
            buffer.putByte((byte) 0x01);
        } else {
            buffer.putByte((byte) 0);
        }
    }

    public Set getSessionFlags() {
        return sessionFlags;
    }

    public void setPreviousSessionId(long previousSessionId) {
        this.previousSessionId = previousSessionId;
    }

    public void setSecurityBuffer(byte[] securityBuffer) {
        this.securityBuffer = securityBuffer;
    }

    public byte[] getSecurityBuffer() {
        return securityBuffer;
    }

    public enum SMB2SessionFlags implements EnumWithValue {
        SMB2_SESSION_FLAG_IS_GUEST(0x0001L),
        SMB2_SESSION_FLAG_IS_NULL(0x0002L),
        SMB2_SESSION_FLAG_ENCRYPT_DATA(0x0004L);

        private long value;

        SMB2SessionFlags(long value) {
            this.value = value;
        }

        public long getValue() {
            return value;
        }
    }

    public enum SMB2SecurityMode implements EnumWithValue {
        SMB2_NEGOTIATE_SIGNING_ENABLED(0x00000001),
        SMB2_NEGOTIATE_SIGNING_REQUIRED(0x00000002);

        private long value;

        SMB2SecurityMode(long value) {
            this.value = value;
        }

        public long getValue() {
            return value;
        }
    }

}