Cant create proper OpenID Connect configuration endpoint (v2)

Question

I want to have an application in azure (simple asp.net mvc application) that keeps users in azure, I want to have that done by azure b2c.

I registered application in azure and put all configurations into appsettings.json what I notice is that the url generated by application does not match the one from azure:

Here's from application:

'https://isthereanynewscodeblast.b2clogin.com/isthereanynewscodeblast.onmicrosoft.com/B2C_1_eclaims_login/v2.0/.well-known/openid-configuration'

Here's from B2C:

'https://isthereanynewscodeblast.b2clogin.com/isthereanynewscodeblast.onmicrosoft.com//v2.0/.well-known/openid-configuration'

Similar but not the same. What I have found is that the url is being generated by AzureADB2COpenIdConnectOptionsConfiguration in this method:

internal static string BuildAuthority(AzureADB2COptions AzureADB2COptions)
{
    var baseUri = new Uri(AzureADB2COptions.Instance);
    var pathBase = baseUri.PathAndQuery.TrimEnd('/');
    var domain = AzureADB2COptions.Domain;
    var policy = AzureADB2COptions.DefaultPolicy;

    return new Uri(baseUri, new PathString($"{pathBase}/{domain}/{policy}/v2.0")).ToString();
}

And here's my .json

"AzureAdB2C": {
  "Instance": "https://isthereanynewscodeblast.b2clogin.com",
  "Domain": "isthereanynewscodeblast.onmicrosoft.com",
  "ClientId": "guid-of-client",
  "CallbackPath": "/signin-oidc",
  "SignUpSignInPolicyId": "B2C_1_eclaims_login ",
  "ResetPasswordPolicyId": "B2C_1_eclaims_reset",
  "EditProfilePolicyId": "B2C_1_eclaims_edit"
},

Which does not match the one from AAD :( Code is from a nuget: Microsoft.AspNetCore.Authorization

It's not protected nor virtual, so I don't see any option to override it.

So my questions are:

is there a way to handle this somehow, so that application can communicate with azure
is there other way to register app, easy like this:

services.AddAuthentication(AzureADB2CDefaults.AuthenticationScheme)
  .AddAzureADB2C(options =>
    {
      Configuration.Bind("AzureAdB2C", options);
    });

//EDIT:

Here's manifest from application registration:

{
    "id": "438a430b-4e80-4c6c-8f45-dfca460b2e03",
    "acceptMappedClaims": null,
    "accessTokenAcceptedVersion": 2,
    "addIns": [],
    "allowPublicClient": null,
    "appId": "44234136-6eee-431f-98ea-668343d7a3fd",
    "appRoles": [],
    "oauth2AllowUrlPathMatching": false,
    "createdDateTime": "2020-08-18T22:32:28Z",
    "groupMembershipClaims": null,
    "identifierUris": [],
    "informationalUrls": {
        "termsOfService": null,
        "support": null,
        "privacy": null,
        "marketing": null
    },
    "keyCredentials": [],
    "knownClientApplications": [],
    "logoUrl": null,
    "logoutUrl": null,
    "name": "user-log-test",
    "oauth2AllowIdTokenImplicitFlow": false,
    "oauth2AllowImplicitFlow": false,
    "oauth2Permissions": [],
    "oauth2RequirePostResponse": false,
    "optionalClaims": null,
    "orgRestrictions": [],
    "parentalControlSettings": {
        "countriesBlockedForMinors": [],
        "legalAgeGroupRule": "Allow"
    },
    "passwordCredentials": [],
    "preAuthorizedApplications": [],
    "publisherDomain": "isthereanynewscodeblast.onmicrosoft.com",
    "replyUrlsWithType": [
        {
            "url": "https://localhost:44395/signin-oidc",
            "type": "Web"
        }
    ],
    "requiredResourceAccess": [
        {
            "resourceAppId": "00000003-0000-0000-c000-000000000000",
            "resourceAccess": [
                {
                    "id": "37f7f235-527c-4136-accd-4a02d197296e",
                    "type": "Scope"
                },
                {
                    "id": "7427e0e9-2fba-42fe-b0c0-848c9e6a8182",
                    "type": "Scope"
                }
            ]
        }
    ],
    "samlMetadataUrl": null,
    "signInUrl": null,
    "signInAudience": "AzureADandPersonalMicrosoftAccount",
    "tags": [],
    "tokenEncryptionKeyId": null
}

Razi Razi · Accepted Answer · 2020-08-23T03:52:55

Can you please try using this b2c sample app which will give you an idea how to use b2c points. It comes with pre-configured endpoints (below), which you can replace with your tenant and policy later for testing.

{
    "AzureAdB2C": {
        "Instance": "https://fabrikamb2c.b2clogin.com",
        "ClientId": "90c0fe63-bcf2-44d5-8fb7-b8bbc0b29dc6",
        "Domain": "fabrikamb2c.onmicrosoft.com",
        "SignedOutCallbackPath": "/signout/B2C_1_susi",
        "SignUpSignInPolicyId": "b2c_1_susi",
        "ResetPasswordPolicyId": "b2c_1_reset",
        "EditProfilePolicyId": "b2c_1_edit_profile" 
    },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}

Cant create proper OpenID Connect configuration endpoint (v2)

2 Answers