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My B2C samples

Dev environment setup

Software tools

  • Visual Studio Code. Recommendation: Set File->Auto Save to On in Visual Studio Code
  • B2C Extensions
  • An xml handling extension, e.g. Red Hat Xml
  • (Optionally) make sure your VSCode settings.json file includes the following xml file association
    "xml.fileAssociations": [
        {
          "pattern": "**.xml",
          "systemId": "https://raw.githubusercontent.com/Azure-Samples/active-directory-b2c-custom-policy-starterpack/master/TrustFrameworkPolicy_0.3.0.0.xsd"
        }
      ],

GitHub Codespaces

If you have access to Github codespaces, copy the devcontainer folder into the root of your project. This codespace is configured as per above section.

Dev B2C setup

  • Register a web app (Token Viewer) with reply url https://oidcdebugger.com/debug; allow return of the access and id token in the Authentication tab
  • Create a user (Users->New user->Create user) with B2C's upn, e.g. [email protected] - useful for experiemnting with MS Graph through the Graph Explorer.
  • Using Invite user to add your corporate users who will manage B2C development. Give them Global Admin privilege (or other needed for their functions in B2C).
  • Use B2C Setup tool to initialize B2C for IEF use.

Usage example

  1. Open VSCode
  2. Select Terminal->New Terminal
  3. Ensure your PowerShell terminal is using PS 7.x ($host.Version)
  4. Create a new folder and change to it (e.g. mkdir myProject; cd myProject)
  5. Enter New-IefPolicies
  6. Select a starter pack, e.g. SL (Social and local accounts)
  7. Enter Connect-IefPolicies <your b2c name; onmicrosoft.com not needed>
  8. Followe displayed instructions to sign in
  9. Enter Import-IefPolicies
  10. The downloaded starter pack will be modified for use in your B2C and uploaded (you can see the modified files in the ./debug folder)
  11. Use https://portal.azure.com B2C menus to execute your policies
  12. Repeating import-iefpolicies will upload policies modified since the last import and any policies depending on it, e.g. modifying the TrustFrameworkBase.xml policy will result in import of all policies since they are all based on that file.

Samples list

Name Description
AllInOne Allow profile edit during signin or password reset
AppRoles Support for application roles using standard AAD features
Batch migration Batch user creation with email to reset pwd using login_hint
B2CSendOTPWithO365 Send email OTP using O365
CallGraph Call a Graph API
ChangeEmail Change signin email address of an exisiting user
CheckEmail Prevents users from signing up or in using emails with specific email domains
Choose 2nd FA User can choose whether to use enail OTP, phone OTP/sms/call or MS Authenticator TOTP
ConditionalAccess Prevents users from signing up or in using emails with specific email domains
ContinueOnOTPVerified UI continues to new password screen as soon as OTP is verified. Continue button is not used.
Claims encryption Supports encryption/decryption of claims in a token
Custom, persisted attribute Modifies starter pack to add support for a new, persisted custom user attribute
Custom token refresh Uses REST function to validate token expiry time
EmailOrUserId Allow users to signup with both an email and a user id and user either to signin later on
EmailOrPhoneMFA Allows local users to use either their email or phone for 2nd FA
Email OTP with reCaptch V3 Supports signin with just OTP to user email (no pwd). Uses Google reCaptcha
Embedded pwd reset Journeys embedding pwd reset functionality as user selectable option
HRD Redirects user to configured IdP (AAD or other) if user's email domain is supported by a configured IdP
IdTokenSelfHint Allows long-running native apps to initiate profile edit without needing to re-authenticate user
Invite Create/use an invitation link using client_assertion request
JIT Migrate Migrate users using an API to verify their legacy passwords
MultiTenant Supports use of a single B2C tenant to support a muli-tenant SaaS application
PromptForToAAD Passes whatever prompt parameter was used with B2C to a federated AAD.
RefreshToken Rejects refresh token exchange if user requested its revocation
SamlIdP Invite B2C users as B2B users in an Azure AD
Step up MFA Require MFA even if recently executed
TOTP Add Authenticator/TOTP
UseUserInfoforEmailClaim Invite B2C users as B2B users in an Azure AD

Changes

Date Change
Sep 2021 New: Federate B2C as IdP for AAD (Direct Federation)
Sep 2021 New: JIT Migration
Sep 2021 Change: Simplified Invitation sample
Oct 2021 Change: Added PS script to assign group to app role in B2C (AppRoles sample)
Oct 2021 Change: Invitation sample supports local-only or federated-only accounts
Oct 2021 New: Conditional Access
Nov 2021 New: Persisted custom attribute
Dec 2021 New: Optionally, allow profile edit during signin
Dec 2021 Change: Multitenant sample now uses a new SPA app and updated policies and REST functions
Feb 2022 New: Use AAD userinfo endpoint to get user's email address (in case AAD does not return it in the id_token)
Feb 2022 New: Claims encryption
Mar 2022 New: Step up MFA
Mar 2022 Fixed: Refresh token
Jun 2022 New: batch migration
Nov 2022 New: user choice of 2nd FA
Mar 2023 New: call Graph
Jun 2023 New: embedded pwd reset

Tips and tricks

Prevent OTP email send if email invalid

Use DisplayCntrols starter pack and the following override:

      <DisplayControl Id="emailVerificationControl2" UserInterfaceControlType="VerificationControl">
        <Actions>
          <Action Id="SendCode">
            <ValidationClaimsExchange>
              <ValidationClaimsExchangeTechnicalProfile TechnicalProfileReferenceId="AAD-UserReadUsingEmailAddress" />                  
            </ValidationClaimsExchange>   
          </Action>
        </Actions>
      </DisplayControl>