/// <summary>
/// Process the SASL challenge message.
/// </summary>
/// <param name="challenge">The server challenge.</param>
/// <returns>
/// The challenge response.
/// </returns>
/// <remarks>
/// SaltedPassword := Hi(Normalize(password), salt, i)
/// ClientKey := HMAC(SaltedPassword, "Client Key")
/// StoredKey := H(ClientKey)
/// AuthMessage := client-first-message-bare + "," +
/// server-first-message + "," +
/// client-final-message-without-proof
/// ClientSignature := HMAC(StoredKey, AuthMessage)
/// ClientProof := ClientKey XOR ClientSignature
/// ServerKey := HMAC(SaltedPassword, "Server Key")
/// ServerSignature := HMAC(ServerKey, AuthMessage)
/// </remarks>
public SaslResponse ProcessChallenge(SaslChallenge challenge)
{
var password = Normalize(this.connectionString.UserPassword);
var decoded = Convert.FromBase64String(challenge.Value);
var serverFirstMessage = XmppEncoding.Utf8.GetString(decoded, 0, decoded.Length);
var tokens = SaslTokenizer.ToDictionary(serverFirstMessage);
var snonce = tokens["r"];
var ssalt = Convert.FromBase64String(tokens["s"]);
var ssaltSize = Convert.ToUInt32(tokens["i"]);
var clientFinalMessageWP = $"c={XmppEncoding.Utf8.GetBytes("n,,").ToBase64String()},r={snonce}";
var saltedPassword = password.Rfc2898DeriveBytes(ssalt, ssaltSize, 20);
var clientKey = saltedPassword.ComputeHmacSha1("Client Key");
var storedKey = clientKey.ComputeSHA1Hash();
var authMessage = $"{this.clientFirstMessageBare},{serverFirstMessage},{clientFinalMessageWP}";
var clientSignature = storedKey.ComputeHmacSha1(authMessage);
var clientProof = clientKey.Xor(clientSignature);
var clientFinalMessage = $"{clientFinalMessageWP},p={clientProof.ToBase64String()}";
var serverKey = saltedPassword.ComputeHmacSha1("Server Key");
this.serverSignature = serverKey.ComputeHmacSha1(authMessage).ToBase64String();
return(new SaslResponse {
Value = clientFinalMessage.ToBase64String()
});
}
private static SaslChallengeAction GetChallengeAction(SaslChallenge saslChallenge)
{
var challengeBytes = saslChallenge.Challenge.Array;
if (challengeBytes == null || challengeBytes.Length == 0)
{
throw new AmqpException(AmqpErrorCode.InvalidField, "Sasl challenge message is missing or empty.");
}
if (challengeBytes[0] == 0x0)
{
return(SaslChallengeAction.First);
}
if ((challengeBytes[0] & SaslControlByteMask.InterimSegment) != 0x0)
{
if ((challengeBytes[0] & SaslControlByteMask.FinalSegment) != 0x0)
{
return(SaslChallengeAction.Final);
}
return(SaslChallengeAction.Interim);
}
throw new AmqpException(AmqpErrorCode.InvalidField,
$"Sasl challenge control byte contains invalid data: {challengeBytes[0]:X}.");
}
public void OnCommand_ReturnsAmqpException_WhenCommandNotSupported()
{
var command = new SaslChallenge();
var profile = new AzureSaslProfileProxy();
AmqpException exception = Should.Throw <AmqpException>(() => profile.CallOnCommand(command));
exception.Error.Condition.ShouldBe((Symbol)ErrorCode.NotAllowed);
exception.Message.ShouldBe(command.ToString());
}
/// <summary>
/// Process the SASL challenge message.
/// </summary>
/// <param name="challenge">The server challenge.</param>
/// <returns>
/// The challenge response.
/// </returns>
public SaslResponse ProcessChallenge(SaslChallenge challenge)
{
// Response to teh Authentication Information Request
this.digestChallenge = DecodeDigestChallenge(challenge);
if (this.digestChallenge.ContainsKey("rspauth"))
{
return(new SaslResponse());
}
return(null);
}
private void SaveEncodedNonceSegment(SaslChallenge saslChallenge)
{
var sequenceNumber = GetSequenceNumber(saslChallenge);
if (_nextSequenceNumber != sequenceNumber)
{
throw new AmqpException(AmqpErrorCode.InvalidField,
$"Invalid sequence number, expected: {_nextSequenceNumber}, actual: {sequenceNumber}.");
}
var nonceSegment = Encoding.UTF8.GetString(saslChallenge.Challenge.Array, 1,
saslChallenge.Challenge.Array.Length - 1);
_encodedNonceStringBuilder.Append(nonceSegment);
_nextSequenceNumber++;
}
public override void OnChallenge(SaslChallenge challenge)
{
var challengeAction = GetChallengeAction(challenge);
switch (challengeAction)
{
case SaslChallengeAction.First:
SendStorageRootKey();
break;
case SaslChallengeAction.Interim:
SaveEncodedNonceSegment(challenge);
SendInterimResponse();
break;
case SaslChallengeAction.Final:
SaveEncodedNonceSegment(challenge);
SendLastResponse();
break;
}
}
private void SaveEncodedNonceSegment(SaslChallenge saslChallenge)
{
var sequenceNumber = GetSequenceNumber(saslChallenge);
if (_nextSequenceNumber != sequenceNumber)
{
throw new AmqpException(AmqpErrorCode.InvalidField,
$"Invalid sequence number, expected: {_nextSequenceNumber}, actual: {sequenceNumber}.");
}
byte[] tempNonce = new byte[_nonceBuffer.Length];
Buffer.BlockCopy(_nonceBuffer, 0, tempNonce, 0, _nonceBuffer.Length);
_nonceBuffer = new byte[_nonceBuffer.Length + saslChallenge.Challenge.Array.Length - 1];
Buffer.BlockCopy(tempNonce, 0, _nonceBuffer, 0, tempNonce.Length);
Buffer.BlockCopy(
saslChallenge.Challenge.Array,
1,
_nonceBuffer,
tempNonce.Length,
saslChallenge.Challenge.Array.Length - 1);
_nextSequenceNumber++;
}
private static Dictionary <string, string> DecodeDigestChallenge(SaslChallenge challenge)
{
var table = new Dictionary <string, string>();
var buffer = Convert.FromBase64String(challenge.Value);
var decoded = Encoding.UTF8.GetString(buffer, 0, buffer.Length);
var keyPairs = Regex.Matches(decoded, @"([\w\s\d]*)\s*=\s*([^,]*)");
foreach (Match match in keyPairs)
{
if (match.Success && match.Groups.Count == 3)
{
string key = match.Groups[1].Value.Trim();
string value = match.Groups[2].Value.Trim();
// Strip quotes from the value
if (value.StartsWith("\"", StringComparison.OrdinalIgnoreCase) ||
value.StartsWith("'", StringComparison.OrdinalIgnoreCase))
{
value = value.Remove(0, 1);
}
if (value.EndsWith("\"", StringComparison.OrdinalIgnoreCase) ||
value.EndsWith("'", StringComparison.OrdinalIgnoreCase))
{
value = value.Remove(value.Length - 1, 1);
}
if (key == "nonce" && table.ContainsKey(key))
{
return(null);
}
table.Add(key, value);
}
}
return(table);
}
private static byte GetSequenceNumber(SaslChallenge saslChallenge)
{
return((byte)(saslChallenge.Challenge.Array[0] & SaslControlByteMask.SequenceNumber));
}
/// <summary>
/// Process the SASL challenge message.
/// </summary>
/// <param name="challenge">The server challenge.</param>
/// <returns>
/// The challenge response.
/// </returns>
public SaslResponse ProcessChallenge(SaslChallenge challenge)
{
return(null);
}
private Element CreateNode(XmlNodeResult nd, Element parent)
{
string ens;
if (nd.Prefix != null)
{
RemObjects.InternetPack.XMPP.Elements.Attribute at = nd.Attribute.FirstOrDefault(a => a.Prefix == "xmlns" && a.Name == nd.Prefix);
if (at == null)
{
Element el = parent;
ens = string.Empty;
while (el != null)
{
RemObjects.InternetPack.XMPP.Elements.Attribute els = el.Attributes.Where(a => a.Prefix == "xmlns" && a.Name == nd.Prefix).FirstOrDefault();
if (els != null)
{
ens = els.Value;
break;
}
el = el.Parent;
}
}
else
{
ens = at.Value;
}
}
else
{
RemObjects.InternetPack.XMPP.Elements.Attribute at = nd.Attribute.FirstOrDefault(a => a.Prefix == null && a.Name == "xmlns");
if (at == null)
{
ens = string.Empty;
}
else
{
ens = at.Value;
}
}
Element res = null;
switch (ens)
{
case Namespaces.ClientStreamNamespace:
case Namespaces.ServerStreamNamespace:
case "":
if (ens == null && parent != null && parent.Type == ElementType.IQ && nd.Name == "error")
{
res = new IQError();
}
else
{
switch (nd.Name)
{
case "iq":
res = new IQ();
break;
case "presence":
res = new Presence();
break;
case "message":
res = new Message();
break;
}
}
break;
case Namespaces.StreamNamespace:
switch (nd.Name)
{
case "stream":
RemObjects.InternetPack.XMPP.Elements.Attribute att = nd.Attribute.FirstOrDefault(a => a.Prefix == null && a.Name == "xmlns");
if (att == null || att.Value == Namespaces.ClientStreamNamespace)
{
res = new ClientStream();
}
else
{
res = new ServerStream();
}
break;
case "features":
res = new StreamFeatures();
break;
case "error":
res = new StreamError();
break;
}
break;
case Namespaces.StartTLSNamespace:
switch (nd.Name)
{
case "starttls":
res = new StartTLS();
break;
case "failure":
res = new StartTLSFailure();
break;
case "proceed":
res = new StartTLSProceed();
break;
}
break;
case Namespaces.SaslNamespace:
switch (nd.Name)
{
case "mechanisms":
res = new Mechanisms();
break;
case "auth":
res = new SaslAuth();
break;
case "challenge":
res = new SaslChallenge();
break;
case "response":
res = new SaslResponse();
break;
case "abort":
res = new SaslAbort();
break;
case "success":
res = new SaslSuccess();
break;
case "failure":
res = new SaslFailure();
break;
}
break;
}
if (res == null)
{
res = new UnknownElement();
}
else
{
res.Attributes.Clear(); // default ones shouldn't be here during the reading process
}
if (parent != null)
{
res.Parent = parent;
if (parent != fServerRoot)
{
parent.Elements.Add(res);
}
}
res.Prefix = nd.Prefix;
res.Name = nd.Name;
foreach (var el in nd.Attribute)
{
res.Attributes.Add(el);
}
return(res);
}