Azure B2C 自定义策略不允许在社交登录上注册

Question

在Azure B2C自定义策略中，我想禁止用户通过社交登录进行注册。如果用户尝试通过社交登录登录，并且该用户在 b2c 租户中不可用，则不应允许他们创建该用户。相反，它应该显示一条错误消息。这是我的用户旅程步骤。我怎样才能改变这个？

<UserJourney Id="CustomSignUpOrSignIn">
      <OrchestrationSteps>
        <OrchestrationStep Order="1" Type="CombinedSignInAndSignUp" ContentDefinitionReferenceId="api.signuporsignin">
          <ClaimsProviderSelections>
            <ClaimsProviderSelection TargetClaimsExchangeId="AzureADCommonExchange" />
            <ClaimsProviderSelection ValidationClaimsExchangeId="LocalAccountSigninEmailExchange" />
            <ClaimsProviderSelection TargetClaimsExchangeId="ForgotPasswordExchange" />
          </ClaimsProviderSelections>
          <ClaimsExchanges>
            <ClaimsExchange Id="LocalAccountSigninEmailExchange" TechnicalProfileReferenceId="SelfAsserted-LocalAccountSignin-Email" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <!-- Check if the user has selected to sign in using one of the social providers -->
        <OrchestrationStep Order="2" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="true">
              <Value>objectId</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="AzureADCommonExchange" TechnicalProfileReferenceId="AADCommon-OpenIdConnect" />
            <ClaimsExchange Id="SignUpWithLogonEmailExchange" TechnicalProfileReferenceId="LocalAccountSignUpWithLogonEmail" />
            <ClaimsExchange Id="ForgotPasswordExchange" TechnicalProfileReferenceId="ForgotPassword" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <OrchestrationStep Order="3" Type="InvokeSubJourney">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="false">
              <Value>isForgotPassword</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <JourneyList>
            <Candidate SubJourneyReferenceId="PasswordReset" />
          </JourneyList>
        </OrchestrationStep>
        <!-- For social IDP authentication, attempt to find the user account in the directory. -->
        <OrchestrationStep Order="4" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimEquals" ExecuteActionsIf="true">
              <Value>authenticationSource</Value>
              <Value>localAccountAuthentication</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="AADUserReadUsingAlternativeSecurityId" TechnicalProfileReferenceId="AAD-UserReadUsingAlternativeSecurityId-NoError" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <!-- Show self-asserted page only if the directory does not have the user account already (i.e. we do not have an objectId). 
          This can only happen when authentication happened using a social IDP. If local account was created or authentication done
          using ESTS in step 2, then an user account must exist in the directory by this time. -->
        <OrchestrationStep Order="5" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="true">
              <Value>objectId</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="SelfAsserted-Social" TechnicalProfileReferenceId="SelfAsserted-Social" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <!-- This step reads any user attributes that we may not have received when authenticating using ESTS so they can be sent 
          in the token. -->
        <OrchestrationStep Order="6" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimEquals" ExecuteActionsIf="true">
              <Value>authenticationSource</Value>
              <Value>socialIdpAuthentication</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="AADUserReadWithObjectId" TechnicalProfileReferenceId="AAD-UserReadUsingObjectId" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <!-- The previous step (SelfAsserted-Social) could have been skipped if there were no attributes to collect 
             from the user. So, in that case, create the user in the directory if one does not already exist 
             (verified using objectId which would be set from the last step if account was created in the directory. -->
        <OrchestrationStep Order="7" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="true">
              <Value>objectId</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="AADUserWrite" TechnicalProfileReferenceId="AAD-UserWriteUsingAlternativeSecurityId" />
          </ClaimsExchanges>
        </OrchestrationStep>
        <OrchestrationStep Order="8" Type="SendClaims" CpimIssuerTechnicalProfileReferenceId="JwtIssuer" />
      </OrchestrationSteps>
      <ClientDefinition ReferenceId="DefaultWeb" />
    </UserJourney>

Answer 1

您需要用块页面和您的消息替换编排步骤 5。

当前：

       <!-- Show self-asserted page only if the directory does not have the user account already (i.e. we do not have an objectId). 
          This can only happen when authentication happened using a social IDP. If local account was created or authentication done
          using ESTS in step 2, then an user account must exist in the directory by this time. -->
        <OrchestrationStep Order="5" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="true">
              <Value>objectId</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="SelfAsserted-Social" TechnicalProfileReferenceId="SelfAsserted-Social" />
          </ClaimsExchanges>
        </OrchestrationStep>

将编排步骤替换为：

       <!-- Disallow signup using social providers -->
        <OrchestrationStep Order="5" Type="ClaimsExchange">
          <Preconditions>
            <Precondition Type="ClaimsExist" ExecuteActionsIf="true">
              <Value>objectId</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
            <Precondition Type="ClaimEquals" ExecuteActionsIf="false">
              <Value>authenticationSource</Value>
              <Value>socialIdpAuthentication</Value>
              <Action>SkipThisOrchestrationStep</Action>
            </Precondition>
          </Preconditions>
          <ClaimsExchanges>
            <ClaimsExchange Id="SelfAsserted-Social-SignupBlock" TechnicalProfileReferenceId="ShowBlockPage" />
          </ClaimsExchanges>
        </OrchestrationStep>

为用户消息添加新声明：

      <ClaimType Id="responseMsg">
        <DisplayName></DisplayName>
        <DataType>string</DataType>
        <AdminHelpText>A claim responsible for holding response messages to display to the user</AdminHelpText>
        <UserHelpText>A claim responsible for holding response messages to display to the user</UserHelpText>
        <UserInputType>Paragraph</UserInputType>
      </ClaimType>

添加索赔提供者：

    <ClaimsProvider>
      <DisplayName>BlockPage</DisplayName>
      <TechnicalProfiles>
        <TechnicalProfile Id="ShowBlockPage">
          <DisplayName>Show Blocked Message</DisplayName>
          <Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.SelfAssertedAttributeProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
          <Metadata>
            <Item Key="ContentDefinitionReferenceId">api.socialccountsignup</Item>
            <Item Key="setting.showContinueButton">false</Item>
            <Item Key="setting.showCancelButton">false</Item>
          </Metadata>
          <InputClaims>
            <InputClaim ClaimTypeReferenceId="responseMsg" DefaultValue="You cannot sign-up using third-party providers." />
          </InputClaims>
          <OutputClaims>
            <OutputClaim ClaimTypeReferenceId="responseMsg" Required="true" />
          </OutputClaims>
          <UseTechnicalProfileForSessionManagement ReferenceId="SM-Noop" />
        </TechnicalProfile>
      </TechnicalProfiles>
    </ClaimsProvider>