public async Task ResetConnectionAsync(ConnectionSettings cs, IOBehavior ioBehavior, CancellationToken cancellationToken)
{
if (ServerVersion.Version.CompareTo(ServerVersions.SupportsResetConnection) >= 0)
{
await SendAsync(ResetConnectionPayload.Create(), ioBehavior, cancellationToken).ConfigureAwait(false);
var payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
OkPayload.Create(payload);
// the "reset connection" packet also resets the connection charset, so we need to change that back to our default
payload = new PayloadData(new ArraySegment <byte>(PayloadUtilities.CreateEofStringPayload(CommandKind.Query, "SET NAMES utf8mb4;")));
await SendAsync(payload, ioBehavior, cancellationToken).ConfigureAwait(false);
payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
OkPayload.Create(payload);
}
else
{
// optimistically hash the password with the challenge from the initial handshake (supported by MariaDB; doesn't appear to be supported by MySQL)
var hashedPassword = AuthenticationUtility.CreateAuthenticationResponse(AuthPluginData, 0, cs.Password);
var payload = ChangeUserPayload.Create(cs.UserID, hashedPassword, cs.Database);
await SendAsync(payload, ioBehavior, cancellationToken).ConfigureAwait(false);
payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
if (payload.HeaderByte == AuthenticationMethodSwitchRequestPayload.Signature)
{
// if the server didn't support the hashed password; rehash with the new challenge
var switchRequest = AuthenticationMethodSwitchRequestPayload.Create(payload);
if (switchRequest.Name != "mysql_native_password")
{
throw new NotSupportedException("Authentication method '{0}' is not supported.".FormatInvariant(switchRequest.Name));
}
hashedPassword = AuthenticationUtility.CreateAuthenticationResponse(switchRequest.Data, 0, cs.Password);
payload = new PayloadData(new ArraySegment <byte>(hashedPassword));
await SendReplyAsync(payload, ioBehavior, cancellationToken).ConfigureAwait(false);
payload = await ReceiveReplyAsync(ioBehavior, cancellationToken).ConfigureAwait(false);
}
OkPayload.Create(payload);
}
}
public static byte[] Create(InitialHandshakePacket handshake, ConnectionSettings cs)
{
// TODO: verify server capabilities
var writer = CreateCapabilitiesPayload(handshake.ProtocolCapabilities, cs);
writer.WriteNullTerminatedString(cs.UserID);
var authenticationResponse = AuthenticationUtility.CreateAuthenticationResponse(handshake.AuthPluginData, 0, cs.Password);
writer.WriteByte((byte)authenticationResponse.Length);
writer.Write(authenticationResponse);
if (!string.IsNullOrWhiteSpace(cs.Database))
{
writer.WriteNullTerminatedString(cs.Database);
}
if ((handshake.ProtocolCapabilities & ProtocolCapabilities.PluginAuth) != 0)
{
writer.WriteNullTerminatedString("mysql_native_password");
}
return(writer.ToBytes());
}
