public void Process(Request request, Response response)
{
// Is this processable?
if (response.StatusCode != StatusCode.Unauthorized ||
response.ContentFormat != 65008)
{
return;
}
try {
// Init from the response data
Oauth.AsInfo info = new Oauth.AsInfo(response.Payload);
// Missage this as needed.
string aSServer = info.ASServer;
// Need to build one from scratch
if (!authServers.ContainsKey(info.ASServer))
{
Console.WriteLine($"No security association is setup for {info.ASServer}");
return;
}
AuthServerInfo asi = authServers[info.ASServer];
if (asi.ClientLink == null)
{
asi.ClientLink = new CoapClient(new Uri(info.ASServer));
if (asi.UseDTLS)
{
asi.ClientLink.EndPoint = new DTLSClientEndPoint(asi.TlsKey);
asi.ClientLink.EndPoint.Start();
}
}
// M00BUG - need to make sure that this will pickup a port number if given.
string audience = $"{request.URI.Scheme}://{request.URI.Authority}";
Oauth.Request myRequest = new Oauth.Request("client_credentials")
{
Audience = audience,
Scope = CBORObject.FromObject(request.UriPath)
};
myRequest.Profile = Profile;
byte[] payload = myRequest.EncodeToBytes();
asi.ClientLink.Timeout = 2 * 60 * 1000;
Response asResponse = asi.ClientLink.Post(payload, MediaType.ApplicationCbor);
if (asResponse == null)
{
asi.ClientLink.EndPoint.Stop();
asi.ClientLink = null;
Console.WriteLine($"Timed out requesting token from {info.ASServer}");
return;
}
if (asResponse.StatusCode != StatusCode.Created)
{
// We had an error condition appear
if (asResponse.Payload != null)
{
CBORObject obj = CBORObject.DecodeFromBytes(asResponse.Payload);
int error = obj["error"].AsInt32();
string errorText = "";
if (obj.ContainsKey("error_description"))
{
errorText = obj["error_description"].AsString();
}
Console.WriteLine(
$"Recieved an error {asResponse.StatusCode} with error no = {error} and description '{errorText}'");
}
else
{
Console.WriteLine($"Received and error {asResponse.StatusCode} from the AS but no text");
}
return;
}
Oauth.Response myResponse = new Oauth.Response(asResponse.Payload);
// default profile for client -
#if false
if (Profile != null && myResponse.Profile != Profile)
{
Console.WriteLine("AS Server returned an unexpected profile {0}", myResponse.Profile);
return;
}
#endif
myResponse.Profile = Oauth.ProfileIds.Coap_Dtls;
// Post token to resource server
CoapClient client = new CoapClient();
client.Uri = new Uri($"coap://{request.URI.Authority}/authz-info");
client.Timeout = 10000; // 1 second
Response tknResponse = client.Post(myResponse.Token, MediaType.ApplicationCbor);
if (tknResponse == null)
{
Console.WriteLine("Post of token failed w/ no response");
return;
}
if (tknResponse.StatusCode != StatusCode.Created)
{
Console.WriteLine($"Post of token failed with error {tknResponse.StatusCode}");
return;
}
Confirmation cnf = myResponse.Confirmation;
Request newRequest = new Request(request.Method);
newRequest.Payload = request.Payload;
newRequest.SetOptions(request.GetOptions());
DTLSClientEndPoint endPoint = null;
switch (myResponse.Profile)
{
case Oauth.ProfileIds.Coap_Dtls: {
OneKey key = cnf.Key;
endPoint = new DTLSClientEndPoint(cnf.Key);
endPoint.Start();
newRequest.EndPoint = endPoint;
newRequest.URI = new Uri($"coaps://{request.URI.Authority}/{request.URI.AbsolutePath}");
}
break;
case Oauth.ProfileIds.Coap_Oscore: {
OneKey oneKey = cnf.Key;
byte[] salt = null;
if (oneKey.ContainsName("slt"))
{
salt = oneKey[CBORObject.FromObject("slt")].GetByteString();
}
CBORObject alg = null;
if (oneKey.ContainsName(CoseKeyKeys.Algorithm))
{
alg = oneKey[CoseKeyKeys.Algorithm];
}
CBORObject kdf = null;
if (oneKey.ContainsName(CBORObject.FromObject("kdf")))
{
kdf = oneKey[CBORObject.FromObject("kdf")];
}
SecurityContext oscoapContext = SecurityContext.DeriveContext(
oneKey[CoseKeyParameterKeys.Octet_k].GetByteString(),
oneKey[CBORObject.FromObject("sid")].GetByteString(),
oneKey[CBORObject.FromObject("rid")].GetByteString(),
salt, alg, kdf);
newRequest.OscoapContext = oscoapContext;
}
break;
default:
Console.WriteLine("Cannot rewrite as we don't recognize the profile");
return;
}
newRequest.Respond += delegate(Object sender, ResponseEventArgs e)
{
Response responseN = e.Response;
if (responseN == null)
{
Console.WriteLine("Request timeout");
}
else
{
Console.WriteLine(Utils.ToString(responseN));
Console.WriteLine("Time (ms): " + responseN.RTT);
}
if (endPoint != null)
{
endPoint.Stop();
}
};
newRequest.Send();
}
catch (Exception e) {
Console.WriteLine("Error processing AceAuthz - " + e.ToString());
}
}
public void Process(Request request, Response response)
{
// Is this processable?
if (response.StatusCode != StatusCode.Unauthorized /* ||
* !(response.ContentFormat == 65008 || response.ContentFormat == MediaType.ApplicationCbor)*/)
{
return;
}
try {
// Init from the response data
Oauth.AsInfo info = new Oauth.AsInfo(response.Payload);
// Massage this as needed.
string aSServer = info.ASServer;
// Need to build one from scratch
if (!authServers.ContainsKey(info.ASServer))
{
Console.WriteLine($"No security association is setup for {info.ASServer}");
return;
}
AuthServerInfo asi = authServers[info.ASServer];
if (asi.ClientLink == null)
{
asi.ClientLink = new CoapClient(new Uri(info.ASServer));
if (asi.UseDTLS)
{
asi.ClientLink.EndPoint = new DTLSClientEndPoint(asi.TlsKey);
asi.ClientLink.EndPoint.Start();
}
else
{
if (asi.ClientLink.Uri.Scheme == "coaps")
{
asi.ClientLink.Uri = new Uri($"coap://{asi.ClientLink.Uri.Authority}/{asi.ClientLink.UriPath}");
}
asi.ClientLink.OscoreContext = asi.OscoreKey;
}
}
// M00BUG - need to make sure that this will pickup a port number if given.
string audience = $"{request.URI.Scheme}://{request.URI.Authority}";
if (UseAudience != null)
{
audience = UseAudience;
}
Oauth.Request myRequest = new Oauth.Request("client_credentials")
{
Audience = audience,
Scope = (UseScopeValue == null) ? CBORObject.FromObject(request.UriPath) : UseScopeValue
};
if (ClientKey != null)
{
myRequest.Cnf = new Confirmation();
switch (ClientKeyType)
{
case 1: // kid
myRequest.Cnf.Kid = ClientKey.PrivateKey[CoseKeyKeys.KeyIdentifier].GetByteString();
break;
case 2: // key
myRequest.Cnf.Key = ClientKey.PrivateKey;
break;
}
}
Response asResponse;
if (asi.UseJSON)
{
string jsonPayload = myRequest.EncodeToString();
asi.ClientLink.Timeout = 2 * 60 * 1000;
asResponse = asi.ClientLink.Post(jsonPayload, MediaType.ApplicationJson);
}
else
{
byte[] payload = myRequest.EncodeToBytes();
asi.ClientLink.Timeout = 2 * 60 * 1000;
asResponse = asi.ClientLink.Post(payload, MediaType.ApplicationCbor);
}
if (asResponse == null)
{
asi.ClientLink.EndPoint.Stop();
asi.ClientLink = null;
Console.WriteLine($"Timed out requesting token from {info.ASServer}");
return;
}
if (asResponse.StatusCode != StatusCode.Created)
{
// We had an error condition appear
if (asResponse.Payload != null)
{
CBORObject obj = CBORObject.DecodeFromBytes(asResponse.Payload);
int error = obj[/*"error"*/ CBORObject.FromObject(15)].AsInt32();
string errorText = "";
if (obj.ContainsKey(/*"error_description")*/ CBORObject.FromObject(16)))
{
errorText = obj[CBORObject.FromObject(16)].AsString();
}
Console.WriteLine(
$"Received an error {asResponse.StatusCode} with error no = {error} and description '{errorText}'");
}
else
{
Console.WriteLine($"Received and error {asResponse.StatusCode} from the AS but no text");
}
return;
}
Oauth.Response myResponse = Oauth.Response.FromCBOR(asResponse.Payload);
// default profile for client -
#if false
if (Profile != null && myResponse.Profile != Profile)
{
Console.WriteLine("AS Server returned an unexpected profile {0}", myResponse.Profile);
return;
}
#endif
if (!myResponse.ContainsKey(Oauth.Oauth_Parameter.Profile))
{
myResponse.Profile = Oauth.ProfileIds.Coap_Dtls;
}
// Post token to resource server
byte[][] OscoreSalts = null;
if (!SendTokenAsPsk)
{
CoapClient client = new CoapClient();
client.Uri = new Uri($"coap://{request.URI.Authority}/authz-info");
client.Timeout = 10000; // 1 second
Response tknResponse = null;
if (myResponse.Profile == Oauth.ProfileIds.Coap_Oscore)
{
byte[] mySalt = new byte[] { 32, 33, 34, 35, 36, 37, 38 };
CBORObject post = CBORObject.NewMap();
post.Add((CBORObject)Oauth.Oauth_Parameter.Access_Token, myResponse.Token);
post.Add((CBORObject)Oauth.Oauth_Parameter.CNonce, mySalt);
tknResponse = client.Post(post.EncodeToBytes(), MediaType.ApplicationAceCbor);
OscoreSalts = new byte[][] { mySalt, null };
}
else
{
tknResponse = client.Post(myResponse.Token, MediaType.ApplicationOctetStream);
}
if (tknResponse == null)
{
Console.WriteLine("Post of token failed w/ no response");
return;
}
if (tknResponse.StatusCode != StatusCode.Created)
{
Console.WriteLine($"Post of token failed with error {tknResponse.StatusCode}");
return;
}
if (tknResponse.ContentType == MediaType.ApplicationAceCbor)
{
CBORObject post = CBORObject.DecodeFromBytes(tknResponse.Payload);
if (post.ContainsKey((CBORObject)Oauth.Oauth_Parameter.Client_id))
{
// Retrieve
}
if (post.ContainsKey((CBORObject)Oauth.Oauth_Parameter.CNonce))
{
if (OscoreSalts == null)
{
throw new Exception("Internal Error - salts");
}
OscoreSalts[1] = post[(CBORObject)Oauth.Oauth_Parameter.CNonce].GetByteString();
}
}
}
Confirmation cnf = myResponse.Confirmation;
if (cnf == null)
{
if (ClientKey == null)
{
Console.WriteLine("Returned a token but I don't know what key I should be using");
return;
}
cnf = new Confirmation(ClientKey.PrivateKey);
}
if (cnf.Kid != null)
{
Console.WriteLine("Missing code - how do we map a kid to a real key?");
return;
}
Request newRequest = new Request(request.Method);
newRequest.Payload = request.Payload;
newRequest.SetOptions(request.GetOptions());
DTLSClientEndPoint endPoint = null;
switch (myResponse.Profile)
{
case Oauth.ProfileIds.Coap_Dtls: {
OneKey key = cnf.Key;
LastKeyFound = cnf.Key;
if (SendTokenAsPsk)
{
cnf.Key.AsCBOR().Set(CoseKeyKeys.KeyIdentifier, CBORObject.FromObject(myResponse.Token));
}
endPoint = new DTLSClientEndPoint(cnf.Key);
endPoint.Start();
if (myResponse.RsConfirmation != null)
{
ResourceInfo rsInfo = new ResourceInfo(myResponse.RsConfirmation.Key);
endPoint.TlsEventHandler += rsInfo.CheckRPK;
}
newRequest.EndPoint = endPoint;
newRequest.URI = new Uri($"coaps://{request.URI.Authority}/{request.URI.AbsolutePath}");
}
break;
case Oauth.ProfileIds.Coap_Oscore: {
CBORObject oscoreContext = cnf.AsCBOR[CBORObject.FromObject(Confirmation.ConfirmationIds.COSE_OSCORE)];
byte[] salt = new byte[0];
if (oscoreContext.ContainsKey(CBORObject.FromObject(6)))
{
salt = oscoreContext[CBORObject.FromObject(CBORObject.FromObject(6))].GetByteString();
}
CBORObject alg = null;
if (oscoreContext.ContainsKey(CBORObject.FromObject(5)))
{
alg = oscoreContext[CBORObject.FromObject(5)];
}
CBORObject kdf = null;
if (oscoreContext.ContainsKey(CBORObject.FromObject(4)))
{
kdf = oscoreContext[CBORObject.FromObject(4)];
}
byte[] keyContext = null;
if (oscoreContext.ContainsKey(CBORObject.FromObject(7)))
{
keyContext = oscoreContext[CBORObject.FromObject(7)].GetByteString();
}
if (OscoreSalts == null)
{
throw new Exception("Internal Error");
}
byte[] newSalt = new byte[salt.Length + OscoreSalts[0].Length + OscoreSalts[1].Length];
Array.Copy(salt, newSalt, salt.Length);
Array.Copy(OscoreSalts[0], 0, newSalt, salt.Length, OscoreSalts[0].Length);
Array.Copy(OscoreSalts[1], 0, newSalt, salt.Length + OscoreSalts[0].Length, OscoreSalts[1].Length);
SecurityContext oscoapContext = SecurityContext.DeriveContext(
oscoreContext[CBORObject.FromObject(1)].GetByteString(), keyContext,
oscoreContext[CBORObject.FromObject(2)].GetByteString(),
oscoreContext[CBORObject.FromObject(3)].GetByteString(),
newSalt, alg, kdf);
newRequest.OscoreContext = oscoapContext;
newRequest.URI = new Uri($"coap://{request.URI.Authority}/{request.URI.AbsolutePath}");
}
break;
default:
Console.WriteLine("Cannot rewrite as we don't recognize the profile");
return;
}
newRequest.Respond += delegate(object sender, ResponseEventArgs e)
{
Response responseN = e.Response;
if (responseN == null)
{
Console.WriteLine("Request timeout");
}
else
{
Console.WriteLine(Utils.ToString(responseN));
Console.WriteLine("Time (ms): " + responseN.RTT);
}
if (endPoint != null)
{
endPoint.Stop();
}
};
newRequest.Send();
}
catch (Exception e) {
Console.WriteLine("Error processing AceAuthz - " + e.ToString());
}
}