How to pass and validate the signInEmail claim during External IDP login using Azure B2C custom policy?

问题

This question is related to this one.

What we'd like to do is: at the moment the user clicks the button like Facebook OR Microsoft account OR Corporate AD in the Sign in page, call a validation technical profile to validate the email address the user is using to sign in.

I tried adding an OrchestrationStep like this:

<OrchestrationStep Order="4" 
  Type="ClaimsExchange">
  <Preconditions>
    <Precondition Type="ClaimEquals" 
      ExecuteActionsIf="false">
      <Value>idp</Value>
      <Value>CorporateAD</Value>
      <Action>SkipThisOrchestrationStep</Action>
    </Precondition>
  </Preconditions>
  <ClaimsExchanges>
    <ClaimsExchange Id="FetchMoreClaimsExchange" 
      TechnicalProfileReferenceId="REST-ValidateSignInEmail" />
  </ClaimsExchanges>
</OrchestrationStep>

This is actually calling REST-ValidateSignInEmail because I see an error returned in the URL like this:

https://mywebsite.azurewebsites.net/#error=server_error&error_description=AADB2C%3a++is+disabled.%0d%0aCorrelation+ID%3a+bce3fd82-1111-4f17-ad99-ef7770ed8dda%0d%0aTimestamp%3a+2019-11-08+20%3a34%3a51Z%0d%0a&state=7b7c70e7-7a77-77d7-7d7e-7dd0e7b707e7

The message is+disabled is coming from the REST API I put together but this obviously tells me that the email\signInEmail claim it expects as a parameter is not being sent\passed.

This is the Technical Profile:

<TechnicalProfile Id="REST-ValidateSignInEmail">
    <DisplayName>Validate Email</DisplayName>
    <Protocol Name="Proprietary" 
            Handler="Web.TPEngine.Providers.RestfulProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
    <Metadata>
       <Item Key="ServiceUrl">{Settings:AzureAppServiceUrl}/api/B2C/ValidateSignInEmail</Item>
       <Item Key="AuthenticationType">None</Item>
       <Item Key="SendClaimsIn">Body</Item>
    </Metadata>
    <InputClaims>
        <InputClaim ClaimTypeReferenceId="signInName" 
              PartnerClaimType="UserEmail" />
        </InputClaims>
    <UseTechnicalProfileForSessionManagement ReferenceId="SM-Noop" />
</TechnicalProfile>

Can you shed some light on how to approach this?

回答1:

Generally after I post the question I keep fiddling with the code.

Got it working like this:

<TechnicalProfile Id="REST-ValidateSignInEmail">
    <DisplayName>Validate Email</DisplayName>
    <Protocol Name="Proprietary" 
            Handler="Web.TPEngine.Providers.RestfulProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
    <Metadata>
       <Item Key="ServiceUrl">{Settings:AzureAppServiceUrl}/api/B2C/ValidateSignInEmail</Item>
       <Item Key="AuthenticationType">None</Item>
       <Item Key="SendClaimsIn">Body</Item>
    </Metadata>
    <InputClaims>
        <InputClaim ClaimTypeReferenceId="signInName" 
              PartnerClaimType="UserEmail" />
        </InputClaims>
        <InputClaim ClaimTypeReferenceId="email" 
              PartnerClaimType="UserEmail" />
        </InputClaims>
    <UseTechnicalProfileForSessionManagement ReferenceId="SM-Noop" />
</TechnicalProfile>

Note that I added a new InputClaim with ClaimTypeReferenceId="email". email is the claim value that is passed when using an external IDP.

This sample policy showed me that I could add the OrchestrationStep right before the JwtIssuer one. We can also have it without any preconditions like this:

<OrchestrationStep Order="7" 
   Type="ClaimsExchange">
   <ClaimsExchanges>
     <ClaimsExchange Id="REST-ValidateSignInEmail" 
       TechnicalProfileReferenceId="REST-ValidateSignInEmail" />
   </ClaimsExchanges>
 </OrchestrationStep>

Doing so it'll get called for all IDPs.

---

Azure Active Directory B2C: Custom CIAM User Journeys

来源：https://stackoverflow.com/questions/58773626/how-to-pass-and-validate-the-signinemail-claim-during-external-idp-login-using-a