private bool Parse_FirstLeg_Authentication_Content(
string _ResponseContent,
out string _AuthorizationCode_From_FirstLeg,
out BMemoryQueryParameters _SSOStateUniqueID_QueryParameters,
out SSOStateMEntry _SSOState,
out string _LocalRedirectUrl_From_FirstLeg,
out string _EmailAddress_From_FirstLeg,
out string _AzureADUniqueID_From_FirstLeg,
out BWebServiceResponse _FailureResponse,
Action <string> _ErrorMessageAction)
{
_AuthorizationCode_From_FirstLeg = null;
_SSOStateUniqueID_QueryParameters = new BMemoryQueryParameters();
_SSOState = null;
_LocalRedirectUrl_From_FirstLeg = null;
_EmailAddress_From_FirstLeg = null;
_AzureADUniqueID_From_FirstLeg = null;
_FailureResponse = BWebResponse.InternalError("");
_ResponseContent = _ResponseContent.Trim();
//Handle error
if (_ResponseContent.StartsWith("error="))
{
var ErrorResponse = new JObject()
{
["result"] = "failure"
};
try
{
var ErrorFields = _ResponseContent.Split('&');
if (ErrorFields != null && ErrorFields.Length >= 2)
{
ErrorResponse["error"] = ErrorFields[0].Substring("error=".Length);
ErrorResponse["message"] = ErrorFields[1].Substring("error_description=".Length);
}
}
catch (Exception) { }
_FailureResponse = BWebResponse.Unauthorized(ErrorResponse.ToString());
return(false);
}
//Normal flow
var Splitted = _ResponseContent.Split('&');
if (Splitted == null || Splitted.Length < 3)
{
_FailureResponse = BWebResponse.BadRequest("Request body must contain all requested types. Split has failed.");
return(false);
}
string IDToken = null;
string StateField = null;
for (var i = 0; i < Splitted.Length; i++)
{
if (Splitted[i].StartsWith("id_token="))
{
IDToken = Splitted[i].Substring("id_token=".Length);
}
else if (Splitted[i].StartsWith("code="))
{
_AuthorizationCode_From_FirstLeg = Splitted[i].Substring("code=".Length);
}
else if (Splitted[i].StartsWith("state="))
{
StateField = WebUtility.UrlDecode(Splitted[i].Substring("state=".Length));
}
}
if (IDToken == null || _AuthorizationCode_From_FirstLeg == null || StateField == null)
{
_FailureResponse = BWebResponse.BadRequest("Request body must contain all requested types.");
return(false);
}
Splitted = StateField.Split('&');
if (Splitted == null || Splitted.Length < 3)
{
_FailureResponse = BWebResponse.BadRequest("State field must contain all mandatory entries. Split has failed.");
return(false);
}
bool bSSOStateUniqueID_QueryParameters_Set = false;
string TenantName = null;
for (var i = 0; i < Splitted.Length; i++)
{
if (Splitted[i].StartsWith("redirect_url="))
{
_LocalRedirectUrl_From_FirstLeg = WebUtility.UrlDecode(Splitted[i].Substring("redirect_url=".Length));
}
else if (Splitted[i].StartsWith("tenant="))
{
TenantName = Splitted[i].Substring("tenant=".Length);
}
else if (Splitted[i].StartsWith("state="))
{
_SSOStateUniqueID_QueryParameters = SSOStateMEntry.ID_SSO_STATE_MEMORY_SERVICE_KEY(Splitted[i].Substring("state=".Length));
bSSOStateUniqueID_QueryParameters_Set = true;
}
}
if (_LocalRedirectUrl_From_FirstLeg == null || TenantName == null || !bSSOStateUniqueID_QueryParameters_Set)
{
_FailureResponse = BWebResponse.BadRequest("State field must contain all mandatory entries.");
return(false);
}
var Serialized = MemoryService.GetKeyValue(_SSOStateUniqueID_QueryParameters, SSOStateMEntry.HASH_KEY, _ErrorMessageAction);
if (Serialized == null)
{
_FailureResponse = BWebResponse.Unauthorized("Login prompt session has expired. Please try again.");
return(false);
}
try
{
_SSOState = JsonConvert.DeserializeObject <SSOStateMEntry>(Serialized.AsString);
if (_SSOState == null)
{
throw new NullReferenceException();
}
}
catch (Exception e)
{
_ErrorMessageAction?.Invoke("Error: SSOLoginCallback->Parse_FirstLeg_Authentication_Content: Invalid session state. Message: " + e.Message + ", trace: " + e.StackTrace);
_FailureResponse = BWebResponse.InternalError("Invalid session state. Please try again.");
return(false);
}
if (_SSOState.Status != SSOStateMEntry.STATUS_AUTHENTICATING)
{
_FailureResponse = BWebResponse.Unauthorized("Invalid SSO state. Please try again.");
return(false);
}
if (TenantName != _SSOState.TenantName)
{
_FailureResponse = BWebResponse.Unauthorized("SSO state - request tenant mismatch. Please try again.");
return(false);
}
var JWTHandler = new JwtSecurityTokenHandler();
JwtSecurityToken Token = null;
try
{
Token = JWTHandler.ReadJwtToken(IDToken);
}
catch (Exception e)
{
_ErrorMessageAction?.Invoke("Error: SSOLoginCallback->Parse_FirstLeg_Authentication_Content: Invalid JWT token. Token: " + IDToken + ", message: " + e.Message + ", trace: " + e.StackTrace);
_FailureResponse = BWebResponse.BadRequest("Invalid JWT token.");
return(false);
}
if (!Token.Payload.TryGetValue("email", out object EmailObject))
{
_FailureResponse = BWebResponse.BadRequest("JWT token does not contain email in the payload.");
return(false);
}
_EmailAddress_From_FirstLeg = ((string)EmailObject).ToLower();
if (!Token.Payload.TryGetValue("sub", out object AzureADUserUniqueIDObject))
{
_FailureResponse = BWebResponse.BadRequest("JWT token does not contain sub in the payload.");
return(false);
}
_AzureADUniqueID_From_FirstLeg = ((string)AzureADUserUniqueIDObject).ToLower();
return(true);
}
private bool Perform_SecondLeg_Authorization(
string _AuthorizationCode_From_FirstLeg,
BMemoryQueryParameters _SSOStateUniqueID_QueryParameters,
SSOStateMEntry _SSOState,
out AuthorizationResult _SuccessResponse,
out BWebServiceResponse _FailureResponse,
Action <string> _ErrorMessageAction)
{
_SuccessResponse = null;
_FailureResponse = BWebResponse.InternalError("");
_SSOState.Status = SSOStateMEntry.STATUS_AUTHORIZING;
MemoryService.SetKeyValue(_SSOStateUniqueID_QueryParameters,
new Tuple <string, BPrimitiveType>[]
{
new Tuple <string, BPrimitiveType>(SSOStateMEntry.HASH_KEY, new BPrimitiveType(JsonConvert.SerializeObject(_SSOState)))
},
_ErrorMessageAction);
MemoryService.SetKeyExpireTime(_SSOStateUniqueID_QueryParameters, TimeSpan.FromSeconds(120), _ErrorMessageAction);
var FormUrlEncodedPairs = new List <KeyValuePair <string, string> >()
{
new KeyValuePair <string, string>("client_id", AzureAD_AppID),
new KeyValuePair <string, string>("scope", SSOCommon.SCOPE),
new KeyValuePair <string, string>("grant_type", "authorization_code"),
new KeyValuePair <string, string>("code", _AuthorizationCode_From_FirstLeg),
new KeyValuePair <string, string>("redirect_uri", WebUtility.UrlDecode(_SSOState.ServersideRedirectUrl)),
new KeyValuePair <string, string>("client_secret", WebUtility.UrlDecode(AzureAD_ClientSecret))
};
using var Handler = new HttpClientHandler
{
SslProtocols = SslProtocols.Tls12 | SslProtocols.Tls11 | SslProtocols.Tls,
ServerCertificateCustomValidationCallback = (a, b, c, d) => true
};
using var Client = new HttpClient(Handler);
Client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");
string ResponseString = null;
try
{
using var RequestContent = new FormUrlEncodedContent(FormUrlEncodedPairs);
using var RequestTask = Client.PostAsync("https://login.microsoftonline.com/common/oauth2/v2.0/token", RequestContent);
RequestTask.Wait();
using var Response = RequestTask.Result;
using var ResponseContent = Response.Content;
using var ReadResponseTask = ResponseContent.ReadAsStringAsync();
ReadResponseTask.Wait();
ResponseString = ReadResponseTask.Result;
if (!Response.IsSuccessStatusCode)
{
bool bJsonParseable = true;
try { JObject.Parse(ResponseString); } catch (JsonReaderException) { bJsonParseable = false; }
_FailureResponse = new BWebServiceResponse(
(int)Response.StatusCode,
new BStringOrStream(ResponseString),
bJsonParseable ? "application/json" : "text/html");
return(false);
}
var Parsed = JObject.Parse(ResponseString);
_SuccessResponse = new AuthorizationResult()
{
TokenType = (string)Parsed["token_type"],
AccessToken = (string)Parsed["access_token"],
ExpiresInSeconds = (int)Parsed["expires_in"],
RefreshToken = (string)Parsed["refresh_token"]
};
}
catch (Exception e)
{
if (e.InnerException != null && e.InnerException != e)
{
_ErrorMessageAction?.Invoke("Error: SSOLoginCallback->Perform_SecondLeg_Authorization->Inner: " + e.InnerException.Message + ", Trace: " + e.InnerException.StackTrace);
}
if (e is AggregateException)
{
foreach (var Inner in (e as AggregateException).InnerExceptions)
{
_ErrorMessageAction?.Invoke("Error: SSOLoginCallback->Perform_SecondLeg_Authorization->Aggregate->Inner: " + Inner.Message + ", Trace: " + Inner.StackTrace);
}
}
_ErrorMessageAction?.Invoke("Error: SSOLoginCallback->Perform_SecondLeg_Authorization: Authorization request failed. Response: " + ResponseString + ", message: " + e.Message + ", trace: " + e.StackTrace);
_FailureResponse = BWebResponse.InternalError("Authorization request has failed.");
return(false);
}
MemoryService.DeleteAllKeys(_SSOStateUniqueID_QueryParameters, true, _ErrorMessageAction);
return(true);
}
private BWebServiceResponse OnRequest_Internal(HttpListenerContext _Context, Action <string> _ErrorMessageAction = null)
{
if (!UrlParameters.TryGetValue("redirect_url", out string RedirectUrlEncoded) || RedirectUrlEncoded.Length == 0)
{
RedirectUrlEncoded = DEFAULT_REDIRECT_URL_ENCODED;
}
if (_Context.Request.HttpMethod != "GET")
{
_ErrorMessageAction?.Invoke("SSOLoginRequest: GET method is accepted. But received request method: " + _Context.Request.HttpMethod);
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), true, BWebResponse.Error_BadRequest_Code, "GET method is accepted. But received request method: " + _Context.Request.HttpMethod));
}
if (!UrlParameters.TryGetValue("tenant", out string TenantName) || TenantName.Length == 0)
{
TenantName = DEFAULT_TENANT_NAME;
}
else
{
TenantName = TenantName.ToLower();
}
//Existing token from header
string ClientAuthorization = null;
if (BWebUtilities.DoesContextContainHeader(out List <string> ClientAuthorizationHeaderValues, out string _, _Context, "client-authorization"))
{
BUtility.CheckAndGetFirstStringFromList(ClientAuthorizationHeaderValues, out ClientAuthorization);
if (ClientAuthorization != null && ClientAuthorization.Length == 0)
{
ClientAuthorization = null;
}
}
//Existing token from url parameters
//Note: Must be token type prepended. Example: ?existing_token=bearer%20abc123123
if (!UrlParameters.TryGetValue("existing_token", out string ExistingToken) || ExistingToken.Length == 0)
{
ExistingToken = null;
}
else
{
ExistingToken = WebUtility.UrlDecode(ExistingToken);
}
//If both existing tokens are non-null; it is error
if (ClientAuthorization != null && ExistingToken != null)
{
_ErrorMessageAction?.Invoke("Error: SSOLoginRequest: Both existing tokens from url parameters and headers are non-null.");
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), true, BWebResponse.Error_BadRequest_Code, "Both existing tokens from url parameters and headers are non-null."));
}
//From now on, use ClientAuthorization; not ExistingToken
if (ExistingToken != null)
{
ClientAuthorization = ExistingToken;
}
//Check and try refresh if expired
if (ClientAuthorization != null &&
new Controller_SSOAccessToken(ClientAuthorization, DatabaseService, MemoryService, AzureAD_AppID, AzureAD_ClientSecret, SSOSuperAdmins, _ErrorMessageAction)
.PerformCheckAndRefresh(
out Controller_SSOAccessToken.EPerformCheckAndRefreshSuccessStatus _,
out ClientAuthorization,
out string UserID,
out string _))
{
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), false, 0, null, UserID, ClientAuthorization));
}
//Get api passthrough endpoint from internal set state
var LocalErrorString = "";
if (!InternalSetState.GetValueFromMemoryService(
out string ApiPassthroughEndpoint,
InternalSetState.API_PASSTHROUGH_PUBLIC_ENDPOINT_PROPERTY,
MemoryService,
(string _Message) =>
{
LocalErrorString = _Message;
_ErrorMessageAction?.Invoke(_Message);
}))
{
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), true, 500, LocalErrorString));
}
string ServersideRedirectUrl = WebUtility.UrlEncode(ApiPassthroughEndpoint + "/auth/login/azure/callback");
string AzureAuthenticationEndpointBase =
"https://login.microsoftonline.com/common/oauth2/v2.0/authorize"
+ "?client_id=" + AzureAD_AppID
+ "&response_type=id_token code"
+ "&redirect_uri=" + ServersideRedirectUrl;
var TrialCount = 0;
string SSOStateUniqueID;
BMemoryQueryParameters SSOStateUniqueID_QueryParameters;
do
{
if (!BUtility.CalculateStringMD5(BUtility.RandomString(32, true), out SSOStateUniqueID, _ErrorMessageAction))
{
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), true, 500, "SSO State ID generation has failed."));
}
SSOStateUniqueID_QueryParameters = SSOStateMEntry.ID_SSO_STATE_MEMORY_SERVICE_KEY(SSOStateUniqueID);
if (!MemoryService.SetKeyValueConditionally(
SSOStateUniqueID_QueryParameters,
new Tuple <string, BPrimitiveType>(
SSOStateMEntry.HASH_KEY,
new BPrimitiveType(JsonConvert.SerializeObject(
new SSOStateMEntry()
{
ServersideRedirectUrl = ServersideRedirectUrl,
TenantName = TenantName,
Status = SSOStateMEntry.STATUS_AUTHENTICATING
})
)
),
_ErrorMessageAction))
{
SSOStateUniqueID = null;
}
} while (SSOStateUniqueID == null && ++TrialCount < 5);
if (SSOStateUniqueID == null)
{
return(SSOCommon.MakeCallerRedirected(WebUtility.UrlDecode(RedirectUrlEncoded), true, 500, "Unique SSO State ID generation has failed."));
}
MemoryService.SetKeyExpireTime(SSOStateUniqueID_QueryParameters, TimeSpan.FromSeconds(120), _ErrorMessageAction);
var AzureAuthenticationEndpoint = AzureAuthenticationEndpointBase
+ "&scope=" + SSOCommon.SCOPE_URL_ENCODED
+ "&response_mode=form_post"
+ "&nonce=" + SSOStateUniqueID
+ "&state="
+ WebUtility.UrlEncode(
"redirect_url=" + RedirectUrlEncoded +
"&tenant=" + TenantName +
"&state=" + SSOStateUniqueID);
return(SSOCommon.MakeCallerRedirected(AzureAuthenticationEndpoint, false, 0, null));
}