com.hierynomus.ntlm.messages.NtlmChallenge 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.ntlm.messages;

import com.hierynomus.msdtyp.MsDataTypes;
import com.hierynomus.protocol.commons.EnumWithValue;
import com.hierynomus.protocol.commons.buffer.Buffer;
import com.hierynomus.protocol.commons.buffer.Endian;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.nio.charset.StandardCharsets;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;

/**
 * [MS-NLMP].pdf 2.2.1.2 CHALLENGE_MESSAGE
 */
public class NtlmChallenge extends NtlmPacket {
    private static final Logger logger = LoggerFactory.getLogger(NtlmChallenge.class);

    private int targetNameLen;
    private int targetNameBufferOffset;
    private EnumSet negotiateFlags;
    private byte[] serverChallenge;
    private WindowsVersion version;
    private int targetInfoLen;
    private int targetInfoBufferOffset;
    private String targetName;
    private Map targetInfo = new HashMap<>();
    private byte[] rawTargetInfo; // TODO remove duplicate byte array

    @Override
    public void read(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        buffer.readString(StandardCharsets.UTF_8, 8); // Signature (8 bytes) (NTLMSSP\0)
        buffer.readUInt32(); // MessageType (4 bytes)
        readTargetNameFields(buffer); // TargetNameFields (8 bytes)
        negotiateFlags = EnumWithValue.EnumUtils.toEnumSet(buffer.readUInt32(), NtlmNegotiateFlag.class); // NegotiateFlags (4 bytes)
        serverChallenge = buffer.readRawBytes(8); // ServerChallenge (8 bytes)
        buffer.skip(8); // Reserved (8 bytes)
        readTargetInfoFields(buffer); // TargetInfoFields(8 bytes)
        readVersion(buffer);
        readTargetName(buffer);
        readTargetInfo(buffer);
    }

    private void readTargetInfo(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        if (targetInfoLen > 0) {
            buffer.rpos(targetInfoBufferOffset);
            rawTargetInfo = buffer.readRawBytes(targetInfoLen);
            // Move to where buffer begins
            buffer.rpos(targetInfoBufferOffset);
            AvId avId;
            while (true) {
                int l = buffer.readUInt16();
                avId = EnumWithValue.EnumUtils.valueOf(l, AvId.class, null); // AvId (2 bytes)
                logger.trace("NTLM channel contains {}({}) TargetInfo", avId, l);
                int avLen = buffer.readUInt16(); // AvLen (2 bytes)
                switch (avId) {
                    case MsvAvEOL:
                        // End of sequence
                        return;
                    case MsvAvNbComputerName:
                    case MsvAvNdDomainName:
                    case MsvAvDnsComputerName:
                    case MsvAvDnsDomainName:
                    case MsvAvDnsTreeName:
                    case MsvAvTargetName:
                        targetInfo.put(avId, buffer.readString(StandardCharsets.UTF_16LE, avLen / 2));
                        break;
                    case MsvAvFlags:
                        targetInfo.put(avId, buffer.readUInt32(Endian.LE));
                        break;
                    case MsvAvTimestamp:
                        targetInfo.put(avId, MsDataTypes.readFileTime(buffer));
                        break;
                    case MsvAvSingleHost:
                        break;
                    case MsvChannelBindings:
                        break;
                    default:
                        throw new IllegalStateException("Encountered unhandled AvId: " + avId);
                }

            }
        }
    }

    private void readTargetName(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        if (targetNameLen > 0) {
            // Move to where buffer begins
            buffer.rpos(targetNameBufferOffset);
            targetName = buffer.readString(StandardCharsets.UTF_16LE, targetNameLen / 2);
        }
    }

    private void readVersion(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        if (negotiateFlags.contains(NtlmNegotiateFlag.NTLMSSP_NEGOTIATE_VERSION)) {
            this.version = new WindowsVersion().readFrom(buffer);
            logger.debug("Windows version = {}", this.version);
        } else {
            buffer.skip(8);
        }
    }

    private void readTargetNameFields(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        targetNameLen = buffer.readUInt16(); // TargetNameLen (2 bytes)
        buffer.skip(2); // TargetNameMaxLen (2 bytes)
        targetNameBufferOffset = buffer.readUInt32AsInt(); // TargetNameBufferOffset (4 bytes)
    }

    private void readTargetInfoFields(Buffer.PlainBuffer buffer) throws Buffer.BufferException {
        if (negotiateFlags.contains(NtlmNegotiateFlag.NTLMSSP_NEGOTIATE_TARGET_INFO)) {
            targetInfoLen = buffer.readUInt16(); // TargetInfoLen (2 bytes)
            buffer.skip(2); // TargetInfoMaxLen (2 bytes)
            targetInfoBufferOffset = buffer.readUInt32AsInt(); // TargetInfoBufferOffset (2 bytes)
        } else {
            buffer.skip(8);
        }
    }

    public String getTargetName() {
        return targetName;
    }

    public byte[] getServerChallenge() {
        return serverChallenge;
    }

    public EnumSet getNegotiateFlags() {
        return negotiateFlags;
    }

    public byte[] getTargetInfo() {
        return rawTargetInfo;
    }

    public Object getAvPairObject(AvId key) {
        return this.targetInfo.get(key);
    }

    public WindowsVersion getVersion() {
        return version;
    }
}