/// <summary>
/// Instantiate a sasl client for the first supported auth type in the
/// given list.
/// </summary>
/// <remarks>
/// Instantiate a sasl client for the first supported auth type in the
/// given list. The auth type must be defined, enabled, and the user
/// must possess the required credentials, else the next auth is tried.
/// </remarks>
/// <param name="authTypes">to attempt in the given order</param>
/// <returns>SaslAuth of instantiated client</returns>
/// <exception cref="AccessControlException">- client doesn't support any of the auths
/// </exception>
/// <exception cref="System.IO.IOException">- misc errors</exception>
/// <exception cref="Javax.Security.Sasl.SaslException"/>
/// <exception cref="Org.Apache.Hadoop.Security.AccessControlException"/>
private RpcHeaderProtos.RpcSaslProto.SaslAuth SelectSaslClient(IList <RpcHeaderProtos.RpcSaslProto.SaslAuth
> authTypes)
{
RpcHeaderProtos.RpcSaslProto.SaslAuth selectedAuthType = null;
bool switchToSimple = false;
foreach (RpcHeaderProtos.RpcSaslProto.SaslAuth authType in authTypes)
{
if (!IsValidAuthType(authType))
{
continue;
}
// don't know what it is, try next
SaslRpcServer.AuthMethod authMethod = SaslRpcServer.AuthMethod.ValueOf(authType.GetMethod
());
if (authMethod == SaslRpcServer.AuthMethod.Simple)
{
switchToSimple = true;
}
else
{
saslClient = CreateSaslClient(authType);
if (saslClient == null)
{
// client lacks credentials, try next
continue;
}
}
selectedAuthType = authType;
break;
}
if (saslClient == null && !switchToSimple)
{
IList <string> serverAuthMethods = new AList <string>();
foreach (RpcHeaderProtos.RpcSaslProto.SaslAuth authType_1 in authTypes)
{
serverAuthMethods.AddItem(authType_1.GetMethod());
}
throw new AccessControlException("Client cannot authenticate via:" + serverAuthMethods
);
}
if (Log.IsDebugEnabled())
{
Log.Debug("Use " + selectedAuthType.GetMethod() + " authentication for protocol "
+ protocol.Name);
}
return(selectedAuthType);
}
private bool IsValidAuthType(RpcHeaderProtos.RpcSaslProto.SaslAuth authType)
{
SaslRpcServer.AuthMethod authMethod;
try
{
authMethod = SaslRpcServer.AuthMethod.ValueOf(authType.GetMethod());
}
catch (ArgumentException)
{
// unknown auth
authMethod = null;
}
// do we know what it is? is it using our mechanism?
return(authMethod != null && authMethod.GetMechanismName().Equals(authType.GetMechanism
()));
}
/// <summary>
/// Do client side SASL authentication with server via the given InputStream
/// and OutputStream
/// </summary>
/// <param name="inS">InputStream to use</param>
/// <param name="outS">OutputStream to use</param>
/// <returns>AuthMethod used to negotiate the connection</returns>
/// <exception cref="System.IO.IOException"/>
public virtual SaslRpcServer.AuthMethod SaslConnect(InputStream inS, OutputStream
outS)
{
DataInputStream inStream = new DataInputStream(new BufferedInputStream(inS));
DataOutputStream outStream = new DataOutputStream(new BufferedOutputStream(outS));
// redefined if/when a SASL negotiation starts, can be queried if the
// negotiation fails
authMethod = SaslRpcServer.AuthMethod.Simple;
SendSaslMessage(outStream, negotiateRequest);
// loop until sasl is complete or a rpc error occurs
bool done = false;
do
{
int totalLen = inStream.ReadInt();
ProtobufRpcEngine.RpcResponseMessageWrapper responseWrapper = new ProtobufRpcEngine.RpcResponseMessageWrapper
();
responseWrapper.ReadFields(inStream);
RpcHeaderProtos.RpcResponseHeaderProto header = responseWrapper.GetMessageHeader(
);
switch (header.GetStatus())
{
case RpcHeaderProtos.RpcResponseHeaderProto.RpcStatusProto.Error:
case RpcHeaderProtos.RpcResponseHeaderProto.RpcStatusProto.Fatal:
{
// might get a RPC error during
throw new RemoteException(header.GetExceptionClassName(), header.GetErrorMsg());
}
default:
{
break;
}
}
if (totalLen != responseWrapper.GetLength())
{
throw new SaslException("Received malformed response length");
}
if (header.GetCallId() != Server.AuthProtocol.Sasl.callId)
{
throw new SaslException("Non-SASL response during negotiation");
}
RpcHeaderProtos.RpcSaslProto saslMessage = RpcHeaderProtos.RpcSaslProto.ParseFrom
(responseWrapper.GetMessageBytes());
if (Log.IsDebugEnabled())
{
Log.Debug("Received SASL message " + saslMessage);
}
// handle sasl negotiation process
RpcHeaderProtos.RpcSaslProto.Builder response = null;
switch (saslMessage.GetState())
{
case RpcHeaderProtos.RpcSaslProto.SaslState.Negotiate:
{
// create a compatible SASL client, throws if no supported auths
RpcHeaderProtos.RpcSaslProto.SaslAuth saslAuthType = SelectSaslClient(saslMessage
.GetAuthsList());
// define auth being attempted, caller can query if connect fails
authMethod = SaslRpcServer.AuthMethod.ValueOf(saslAuthType.GetMethod());
byte[] responseToken = null;
if (authMethod == SaslRpcServer.AuthMethod.Simple)
{
// switching to SIMPLE
done = true;
}
else
{
// not going to wait for success ack
byte[] challengeToken = null;
if (saslAuthType.HasChallenge())
{
// server provided the first challenge
challengeToken = saslAuthType.GetChallenge().ToByteArray();
saslAuthType = ((RpcHeaderProtos.RpcSaslProto.SaslAuth)RpcHeaderProtos.RpcSaslProto.SaslAuth
.NewBuilder(saslAuthType).ClearChallenge().Build());
}
else
{
if (saslClient.HasInitialResponse())
{
challengeToken = new byte[0];
}
}
responseToken = (challengeToken != null) ? saslClient.EvaluateChallenge(challengeToken
) : new byte[0];
}
response = CreateSaslReply(RpcHeaderProtos.RpcSaslProto.SaslState.Initiate, responseToken
);
response.AddAuths(saslAuthType);
break;
}
case RpcHeaderProtos.RpcSaslProto.SaslState.Challenge:
{
if (saslClient == null)
{
// should probably instantiate a client to allow a server to
// demand a specific negotiation
throw new SaslException("Server sent unsolicited challenge");
}
byte[] responseToken = SaslEvaluateToken(saslMessage, false);
response = CreateSaslReply(RpcHeaderProtos.RpcSaslProto.SaslState.Response, responseToken
);
break;
}
case RpcHeaderProtos.RpcSaslProto.SaslState.Success:
{
// simple server sends immediate success to a SASL client for
// switch to simple
if (saslClient == null)
{
authMethod = SaslRpcServer.AuthMethod.Simple;
}
else
{
SaslEvaluateToken(saslMessage, true);
}
done = true;
break;
}
default:
{
throw new SaslException("RPC client doesn't support SASL " + saslMessage.GetState
());
}
}
if (response != null)
{
SendSaslMessage(outStream, ((RpcHeaderProtos.RpcSaslProto)response.Build()));
}
}while (!done);
return(authMethod);
}
/// <summary>Try to create a SaslClient for an authentication type.</summary>
/// <remarks>
/// Try to create a SaslClient for an authentication type. May return
/// null if the type isn't supported or the client lacks the required
/// credentials.
/// </remarks>
/// <param name="authType">- the requested authentication method</param>
/// <returns>SaslClient for the authType or null</returns>
/// <exception cref="Javax.Security.Sasl.SaslException">- error instantiating client</exception>
/// <exception cref="System.IO.IOException">- misc errors</exception>
private SaslClient CreateSaslClient(RpcHeaderProtos.RpcSaslProto.SaslAuth authType
)
{
string saslUser = null;
// SASL requires the client and server to use the same proto and serverId
// if necessary, auth types below will verify they are valid
string saslProtocol = authType.GetProtocol();
string saslServerName = authType.GetServerId();
IDictionary <string, string> saslProperties = saslPropsResolver.GetClientProperties
(serverAddr.Address);
CallbackHandler saslCallback = null;
SaslRpcServer.AuthMethod method = SaslRpcServer.AuthMethod.ValueOf(authType.GetMethod
());
switch (method)
{
case SaslRpcServer.AuthMethod.Token:
{
Org.Apache.Hadoop.Security.Token.Token <object> token = GetServerToken(authType);
if (token == null)
{
return(null);
}
// tokens aren't supported or user doesn't have one
saslCallback = new SaslRpcClient.SaslClientCallbackHandler(token);
break;
}
case SaslRpcServer.AuthMethod.Kerberos:
{
if (ugi.GetRealAuthenticationMethod().GetAuthMethod() != SaslRpcServer.AuthMethod
.Kerberos)
{
return(null);
}
// client isn't using kerberos
string serverPrincipal = GetServerPrincipal(authType);
if (serverPrincipal == null)
{
return(null);
}
// protocol doesn't use kerberos
if (Log.IsDebugEnabled())
{
Log.Debug("RPC Server's Kerberos principal name for protocol=" + protocol.GetCanonicalName
() + " is " + serverPrincipal);
}
break;
}
default:
{
throw new IOException("Unknown authentication method " + method);
}
}
string mechanism = method.GetMechanismName();
if (Log.IsDebugEnabled())
{
Log.Debug("Creating SASL " + mechanism + "(" + method + ") " + " client to authenticate to service at "
+ saslServerName);
}
return(Javax.Security.Sasl.Sasl.CreateSaslClient(new string[] { mechanism }, saslUser
, saslProtocol, saslServerName, saslProperties, saslCallback));
}