Une introduction détaillée au package d'authentification et au code du protocole mysql

client                 server
   |-------connect------>|
   |                     |
   |<-----handshake------|
   |                     |
   |---authentication--->|
   |                     |

4              capability flags, CLIENT_PROTOCOL_41 always set
4              max-packet size
1              character set
string[23]     reserved (all [0])
string[NUL]    username
  if capabilities & CLIENT_PLUGIN_AUTH_LENENC_CLIENT_DATA {
lenenc-int     length of auth-response
string[n]      auth-response
  } else if capabilities & CLIENT_SECURE_CONNECTION {
1              length of auth-response
string[n]      auth-response
  } else {
string[NUL]    auth-response
  }
  if capabilities & CLIENT_CONNECT_WITH_DB {
string[NUL]    database
  }
  if capabilities & CLIENT_PLUGIN_AUTH {
string[NUL]    auth plugin name
  }
  if capabilities & CLIENT_CONNECT_ATTRS {
lenenc-int     length of all key-values
lenenc-str     key
lenenc-str     value
   if-more data in 'length of all key-values', more keys and value pairs
  }

<b>blog: </b>//m.sbmmt.com/;/pre>
 * <p>mysql auth packet.</p>
 */public class AuthPacket extends MySQLPacket {
    private static final byte[] FILLER = new byte[23];    
    public long clientFlags;    
    public long maxPacketSize;    
    public int charsetIndex;    
    public byte[] extra;    
    public String user;    
    public byte[] password;    
    public String database;    
    public void read(byte[] data) {
        MySQLMessage mm = new MySQLMessage(data);
        packetLength = mm.readUB3();
        packetId = mm.read();
        clientFlags = mm.readUB4();
        maxPacketSize = mm.readUB4();
        charsetIndex = (mm.read() & 0xff);        
        int current = mm.position();        
        int len = (int) mm.readLength();        
        if (len > 0 && len < FILLER.length) {            
        byte[] ab = new byte[len];
            System.arraycopy(mm.bytes(), mm.position(), ab, 0, len);            
            this.extra = ab;
        }
        mm.position(current + FILLER.length);
        user = mm.readStringWithNull();
        password = mm.readBytesWithLength();        
        if (((clientFlags & Capabilities.CLIENT_CONNECT_WITH_DB) != 0)
                && mm.hasRemaining()) {
            database = mm.readStringWithNull();
        }
    }    public void write(ByteBuffer buffer) throws IOException {
        BufferUtil.writeUB3(buffer, calcPacketSize());
        buffer.put(packetId);
        BufferUtil.writeUB4(buffer, clientFlags);
        BufferUtil.writeUB4(buffer, maxPacketSize);
        buffer.put((byte) charsetIndex);
        buffer.put(FILLER);        if (user == null) {
            buffer.put((byte) 0);
        } else {
            BufferUtil.writeWithNull(buffer, user.getBytes());
        }        if (password == null) {
            buffer.put((byte) 0);
        } else {
            BufferUtil.writeWithLength(buffer, password);
        }        if (database == null) {
            buffer.put((byte) 0);
        } else {
            BufferUtil.writeWithNull(buffer, database.getBytes());
        }
    }    @Override
    public int calcPacketSize() {        
    int size = 32;// 4+4+1+23;
        size += (user == null) ? 1 : user.length() + 1;
        size += (password == null) ? 1 : BufferUtil.getLength(password);
        size += (database == null) ? 1 : database.length() + 1;        
        return size;
    }    @Override
    protected String getPacketInfo() {        
    return "MySQL Authentication Packet";
    }

}

<b>blog: </b>//m.sbmmt.com/;/pre>
 * <p>a security util .</p>
 */public class SecurityUtil {

    public static final byte[] scramble411(byte[] pass, byte[] seed)            
    throws NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-1");        
        byte[] pass1 = md.digest(pass);
        md.reset();        
        byte[] pass2 = md.digest(pass1);
        md.reset();
        md.update(seed);        
        byte[] pass3 = md.digest(pass2);        
        for (int i = 0; i < pass3.length; i++) {
            pass3[i] = (byte) (pass3[i] ^ pass1[i]);
        }        return pass3;
    }    public static final String scramble323(String pass, String seed) {        
    if ((pass == null) || (pass.length() == 0)) {            
    return pass;
        }        
        byte b;        
        double d;        
        long[] pw = hash(seed);        
        long[] msg = hash(pass);        
        long max = 0x3fffffffL;        
        long seed1 = (pw[0] ^ msg[0]) % max;        
        long seed2 = (pw[1] ^ msg[1]) % max;        
        char[] chars = new char[seed.length()];        
        for (int i = 0; i < seed.length(); i++) {
            seed1 = ((seed1 * 3) + seed2) % max;
            seed2 = (seed1 + seed2 + 33) % max;
            d = (double) seed1 / (double) max;
            b = (byte) java.lang.Math.floor((d * 31) + 64);
            chars[i] = (char) b;
        }
        seed1 = ((seed1 * 3) + seed2) % max;
        seed2 = (seed1 + seed2 + 33) % max;
        d = (double) seed1 / (double) max;
        b = (byte) java.lang.Math.floor(d * 31);        
        for (int i = 0; i < seed.length(); i++) {
            chars[i] ^= (char) b;
        }        return new String(chars);
    }    private static long[] hash(String src) {        
    long nr = 1345345333L;        
    long add = 7;        
    long nr2 = 0x12345671L;        
    long tmp;        
    for (int i = 0; i < src.length(); ++i) {            
    switch (src.charAt(i)) {            
    case &#39; &#39;:            
    case &#39;\t&#39;:                
    continue;            
    default:
                tmp = (0xff & src.charAt(i));
                nr ^= ((((nr & 63) + add) * tmp) + (nr << 8));
                nr2 += ((nr2 << 8) ^ nr);
                add += tmp;
            }
        }        
        long[] result = new long[2];
        result[0] = nr & 0x7fffffffL;
        result[1] = nr2 & 0x7fffffffL;        
        return result;
    }

}

<b>blog: </b>//m.sbmmt.com/;/pre>
 * <p>test auth packet.</p>
 */public class AuthPacketTest {
    @Test
    public void produce() {        
    // handshake packet&#39;s rand1 and rand2
        byte[] rand1 = RandomUtil.randomBytes(8);        
        byte[] rand2 = RandomUtil.randomBytes(12);        
        byte[] seed = new byte[rand1.length + rand2.length];
        System.arraycopy(rand1, 0, seed, 0, rand1.length);
        System.arraycopy(rand2, 0, seed, rand1.length, rand2.length);

        AuthPacket auth = new AuthPacket();
        auth.packetId = 0;
        auth.clientFlags = getClientCapabilities();
        auth.maxPacketSize = 1024 * 1024 * 16;
        auth.user = "seaboat";        try {
            auth.password = SecurityUtil
                    .scramble411("seaboat".getBytes(), seed);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        auth.database = "test";

        ByteBuffer buffer = ByteBuffer.allocate(256);
        auth.write(buffer);
        buffer.flip();        byte[] bytes = new byte[buffer.remaining()];
        buffer.get(bytes, 0, bytes.length);
        String result = HexUtil.Bytes2HexString(bytes);
        System.out.println(result);
        assertTrue(Integer.valueOf(result.substring(0, 2), 16) == result
                .length() / 2 - 4);

        AuthPacket auth2 = new AuthPacket();
        auth2.read(bytes);
        assertTrue(auth2.database.equals("test"));
    }    protected int getClientCapabilities() {        
    int flag = 0;
        flag |= Capabilities.CLIENT_LONG_PASSWORD;
        flag |= Capabilities.CLIENT_FOUND_ROWS;
        flag |= Capabilities.CLIENT_LONG_FLAG;
        flag |= Capabilities.CLIENT_CONNECT_WITH_DB;
        flag |= Capabilities.CLIENT_ODBC;
        flag |= Capabilities.CLIENT_IGNORE_SPACE;
        flag |= Capabilities.CLIENT_PROTOCOL_41;
        flag |= Capabilities.CLIENT_INTERACTIVE;
        flag |= Capabilities.CLIENT_IGNORE_SIGPIPE;
        flag |= Capabilities.CLIENT_TRANSACTIONS;
        flag |= Capabilities.CLIENT_SECURE_CONNECTION;        
        return flag;
    }
}