.NET Core C#
.NET Core C#
Azure OpenID Connect Step 2 -- Get id_token and Validate
See more OIDC Examples
After getting the endpoints by querying the Azure's OIDC well-known discovery document (OpenID Configuration document), we use the authorization_endpoint to get the id_token, and then validate it..Chilkat .NET Core C# Downloads
bool success = false;
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// In our previous example (Azure Fetch OpenID Connect metadata document) we fetched
// the OpenID configuration document which is JSON which contains an entry for authorization_endpoint.
string authorization_endpoint = "https://login.microsoftonline.com/{tenant}/oauth2/v2.0/authorize";
// The OpenID Connect metadata document also contained a jwks_uri entry. This is the JSON Web Key Set (JWKS),
// which is a set of keys containing the public keys used to verify any JSON Web Token (JWT) (in this case the id_token)
// issued by the authorization server and signed using the RS256 signing algorithm.
string jwks_uri = "https://login.microsoftonline.com/{tenant}/discovery/v2.0/keys";
// We're going to send the following GET request, but it will be sent through an interactive web browser (not by Chilkat).
// The following code will form the URL that is to be programmatically loaded and sent in a browser.
// GET https://login.microsoftonline.com/{tenant}/oauth2/v2.0/authorize?
// client_id=6731de76-14a6-49ae-97bc-6eba6914391e
// &response_type=id_token
// &redirect_uri=http%3A%2F%2Flocalhost%2Fmyapp%2F
// &response_mode=form_post
// &scope=openid
// &state=12345
// &nonce=678910
// Use this object to set params and then get the URL-encoded query params string
Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.AddParam("client_id","{client_id}");
req.AddParam("response_type","id_token");
req.AddParam("redirect_uri","http://localhost:3017/");
req.AddParam("response_mode","form_post");
req.AddParam("scope","openid");
Chilkat.Prng prng = new Chilkat.Prng();
req.AddParam("state",prng.GenRandom(3,"decimal"));
req.AddParam("nonce",prng.GenRandom(4,"decimal"));
string encodedParams = req.GetUrlEncodedParams();
Debug.WriteLine(encodedParams);
// Sample URL encoded params:
// client_id=6731de76-14a6-49ae-97bc-6eba6914391e&redirect_uri=http%3A%2F%2Flocalhost%3A3017%2F&response_mode=form_post&scope=openid&state=3572902&nonce=57352474
// This is the URL to be programmatically loaded and sent in an interactive web browser..
Chilkat.StringBuilder sbUrl = new Chilkat.StringBuilder();
sbUrl.Append(authorization_endpoint);
sbUrl.Append("?");
sbUrl.Append(encodedParams);
string url = sbUrl.GetAsString();
// Before we launch the browser with the contents of sbUrl, create a socket to listen for the eventual callback..
Chilkat.Socket listenSock = new Chilkat.Socket();
// This is the connection received from the browser.
Chilkat.Socket browserSock = new Chilkat.Socket();
// Listen at the port indicated by the redirect_uri above.
int backLog = 5;
success = listenSock.BindAndListen(3017,backLog);
if (success == false) {
Debug.WriteLine(listenSock.LastErrorText);
return;
}
// Wait for the browser's connection in a background thread.
// (We'll send load the URL into the browser following this..)
// Wait a max of 60 seconds before giving up.
int maxWaitMs = 30000;
Chilkat.Task task = listenSock.AcceptNextAsync(maxWaitMs,browserSock);
task.Run();
// -------------------------------------------------------------------
// At this point, your application should load the URL in a browser.
Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();
success = oauth2.LaunchBrowser(url);
if (success == false) {
Debug.WriteLine(oauth2.LastErrorText);
return;
}
// -------------------------------------------------------------------
// Wait for the listenSock's task to complete.
success = task.Wait(maxWaitMs);
if (!success || (task.StatusInt != 7) || (task.TaskSuccess != true)) {
if (!success) {
// The task.LastErrorText applies to the Wait method call.
Debug.WriteLine(task.LastErrorText);
}
else {
// The ResultErrorText applies to the underlying task method call (i.e. the AcceptNextConnection)
Debug.WriteLine(task.Status);
Debug.WriteLine(task.ResultErrorText);
}
return;
}
// If we get to this point, a connection on listenSock was accepted, and the redirected POST
// is waiting to be read on the connected socket.
// The POST we are going to read contains the following:
// POST /myapp/ HTTP/1.1
// Host: localhost
// Content-Type: application/x-www-form-urlencoded
//
// id_token=eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiIsIng1dCI6Ik1uQ19WWmNB...&state=12345
// But first.. we no longer need the listen socket...
// Stop listening on port 3017.
listenSock.Close(10);
// We're acting as a temporary web server to receive this one redirected HTTP request..
// Read the start line of the request.. (i.e. the "POST /myapp/ HTTP/1.1")
string startLine = browserSock.ReceiveUntilMatch("\r\n");
if (browserSock.LastMethodSuccess == false) {
Debug.WriteLine(browserSock.LastErrorText);
return;
}
// Read the request header.
string requestHeader = browserSock.ReceiveUntilMatch("\r\n\r\n");
if (browserSock.LastMethodSuccess == false) {
Debug.WriteLine(browserSock.LastErrorText);
return;
}
Debug.WriteLine(requestHeader);
Debug.WriteLine("----");
// Read the body.
// The body will contain "id_token= eyJ......"
Chilkat.StringBuilder sbRequestBody = new Chilkat.StringBuilder();
success = browserSock.ReceiveSb(sbRequestBody);
if (success == false) {
Debug.WriteLine(browserSock.LastErrorText);
return;
}
Debug.WriteLine(sbRequestBody.GetAsString());
// Given that we're acting as a web server, we must send a response..
// We can now send our HTTP response.
Chilkat.StringBuilder sbResponseHtml = new Chilkat.StringBuilder();
sbResponseHtml.Append("<html><body><p>Thank you!</b></body</html>");
Chilkat.StringBuilder sbResponse = new Chilkat.StringBuilder();
sbResponse.Append("HTTP/1.1 200 OK\r\n");
sbResponse.Append("Content-Length: ");
sbResponse.AppendInt(sbResponseHtml.Length);
sbResponse.Append("\r\n");
sbResponse.Append("Content-Type: text/html\r\n");
sbResponse.Append("\r\n");
sbResponse.AppendSb(sbResponseHtml);
browserSock.SendString(sbResponse.GetAsString());
browserSock.Close(50);
// Get the id_token from the sbRequestBody that we just received.
// (Remember, we're acting as the web server, thus we received the redirect request..)
Chilkat.Hashtable hashTab = new Chilkat.Hashtable();
hashTab.AddQueryParams(sbRequestBody.GetAsString());
// See https://docs.microsoft.com/en-us/azure/active-directory/develop/id-tokens#validating-an-id-token
// for more information about ID tokens..
string idToken = hashTab.LookupStr("id_token");
Chilkat.Jwt jwt = new Chilkat.Jwt();
// Let's see if the time constraints, if any, are valid.
// The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
// If the current system time is before the "nbf" time, or after the "exp" time,
// then IsTimeValid will return false/0.
// Also, we'll allow a leeway of 60 seconds to account for any clock skew.
// Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
int leeway = 60;
bool bTimeValid = jwt.IsTimeValid(idToken,leeway);
Debug.WriteLine("time constraints valid: " + Convert.ToString(bTimeValid));
// Now let's recover the original claims JSON (the payload).
string payload = jwt.GetPayload(idToken);
// The payload will likely be in compact form:
Debug.WriteLine(payload);
// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
Chilkat.JsonObject json = new Chilkat.JsonObject();
success = json.Load(payload);
json.EmitCompact = false;
Debug.WriteLine(json.Emit());
// Sample output:
// {
// "aud": "f125d695-c50e-456e-a579-a486f06d1213",
// "iss": "https://login.microsoftonline.com/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/v2.0",
// "iat": 1626535322,
// "nbf": 1626535322,
// "exp": 1626539222,
// "aio": "AWQAm/8TAAAAHQncmY0VvhgyMIhfleHX3DjsGfmlPM1CopkJ3mPnBUnCxrJ0ubruaACEhwGO7NsoHBhqFEzRzPxOq7MtuGVFsql+qJKZx8vQCszKYEPX9Wb3b5+d5KJTABHCIH48bTFd",
// "idp": "https://sts.windows.net/9188040d-6c67-4c5b-b112-36a304b66dad/",
// "nonce": "1519043321",
// "rh": "0.ARgAZt2NbdFosEOvXOMbS33VzZXWJfEOxW5FpXmkhvBtEhMYALQ.",
// "sub": "RMIZlHJ7hfsJmL8Qq3h6M0nPi4g-HEavnAFgxzaT2KM",
// "tid": "6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd",
// "uti": "-BXGHxvfREW-r9HI5NBiAA",
// "ver": "2.0"
// }
// We can recover the original JOSE header in the same way:
string joseHeader = jwt.GetHeader(idToken);
// The payload will likely be in compact form:
Debug.WriteLine(joseHeader);
// We can format for human viewing by loading it into Chilkat's JSON object
// and emit.
Chilkat.JsonObject jsonJoseHeader = new Chilkat.JsonObject();
success = jsonJoseHeader.Load(joseHeader);
jsonJoseHeader.EmitCompact = false;
Debug.WriteLine(jsonJoseHeader.Emit());
// Sample output:
// {
// "typ": "JWT",
// "alg": "RS256",
// "kid": "nOo3ZDrODXEK1jKWhXslHR_KXEg"
// }
// Finally, we need to fetch the JSON Web Key Sets from the jwks_uri
// and use it to verify the id_token's RSA signature.
Chilkat.StringBuilder sbJwks = new Chilkat.StringBuilder();
Chilkat.Http http = new Chilkat.Http();
success = http.QuickGetSb(jwks_uri,sbJwks);
if (success == false) {
Debug.WriteLine(http.LastErrorText);
return;
}
Chilkat.JsonObject jwkset = new Chilkat.JsonObject();
success = jwkset.LoadSb(sbJwks);
jwkset.EmitCompact = false;
Debug.WriteLine(jwkset.Emit());
// A sample jwkset:
// {
// "keys": [
// {
// "kty": "RSA",
// "use": "sig",
// "kid": "nOo3ZDrODXEK1jKWhXslHR_KXEg",
// "x5t": "nOo3ZDrODXEK1jKWhXslHR_KXEg",
// "n": "oaLLT9hkcSj ... NVrZdUdTBQ",
// "e": "AQAB",
// "x5c": [
// "MIIDBTC ... MRku44Dw7R"
// ],
// "issuer": "https://login.microsoftonline.com/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/v2.0"
// },
// {
// "kty": "RSA",
// "use": "sig",
// "kid": "l3sQ-50cCH4xBVZLHTGwnSR7680",
// "x5t": "l3sQ-50cCH4xBVZLHTGwnSR7680",
// "n": "sfsXMXW ... AYkwb6xUQ",
// "e": "AQAB",
// "x5c": [
// "MIIDBTCCA ... BWrh+/vJ"
// ],
// "issuer": "https://login.microsoftonline.com/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/v2.0"
// },
// {
// "kty": "RSA",
// "use": "sig",
// "kid": "DqUu8gf-nAgcyjP3-SuplNAXAnc",
// "x5t": "DqUu8gf-nAgcyjP3-SuplNAXAnc",
// "n": "1n7-nWSL ... V3pFWhQ",
// "e": "AQAB",
// "x5c": [
// "MIIC8TC ... 9pIcnkPQ=="
// ],
// "issuer": "https://login.microsoftonline.com/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/v2.0"
// },
// {
// "kty": "RSA",
// "use": "sig",
// "kid": "OzZ5Dbmcso9Qzt2ModGmihg30Bo",
// "x5t": "OzZ5Dbmcso9Qzt2ModGmihg30Bo",
// "n": "01re9a2BU ... 5OzQ6Q",
// "e": "AQAB",
// "x5c": [
// "MIIC8TC ... YmwJ6sDdRvQ=="
// ],
// "issuer": "https://login.microsoftonline.com/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/v2.0"
// }
// ]
// }
// We should have an RSA key with kid matching the kid from the joseHeader..
string kid = jsonJoseHeader.StringOf("kid");
// Find the RSA key with the specified key id
Chilkat.JsonObject jwk = jwkset.FindRecord("keys","kid",kid,true);
if (jwkset.LastMethodSuccess == false) {
Debug.WriteLine("Failed to find a matching RSA key in the JWK key set...");
return;
}
bool verified;
Chilkat.PublicKey pubkey = new Chilkat.PublicKey();
success = pubkey.LoadFromString(jwk.Emit());
if (success == false) {
Debug.WriteLine(pubkey.LastErrorText);
Debug.WriteLine(jwk.Emit());
}
else {
verified = jwt.VerifyJwtPk(idToken,pubkey);
Debug.WriteLine("Verified: " + Convert.ToString(verified));
}