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Define a phone factor technical profile in an Azure Active Directory B2C custom policy

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Note

In Azure Active Directory B2C, custom policies are designed primarily to address complex scenarios. For most scenarios, we recommend that you use built-in user flows. If you've not done so, learn about custom policy starter pack in Get started with custom policies in Active Directory B2C.

Azure Active Directory B2C (Azure AD B2C) provides support for enrolling and verifying phone numbers. This technical profile:

  • Provides a user interface to interact with the user to verify, or enroll a phone number.
  • Supports phone calls and text messages to validate the phone number.
  • Supports multiple phone numbers. The user can select one of the phone numbers to verify.
  • Returns a claim indicating whether the user provided a new phone number. You can use this claim to decide whether the phone number should be persisted to the Azure AD B2C user profile.
  • Uses a content definition to control the look and feel.

Protocol

The Name attribute of the Protocol element needs to be set to Proprietary. The handler attribute must contain the fully qualified name of the protocol handler assembly that is used by Azure AD B2C for phone factor: Web.TPEngine.Providers.PhoneFactorProtocolProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null

The following example shows a phone factor technical profile for enrollment and validation:

<TechnicalProfile Id="PhoneFactor-InputOrVerify">
  <DisplayName>PhoneFactor</DisplayName>
  <Protocol Name="Proprietary" Handler="Web.TPEngine.Providers.PhoneFactorProtocolProvider, Web.TPEngine, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</TechnicalProfile>

Input claims transformations

The InputClaimsTransformations element may contain a collection of input claims transformations that are used to modify the input claims, or generate new ones. The following input claims transformation generates a UserId claim that is used later in the input claims collection.

<InputClaimsTransformations>
  <InputClaimsTransformation ReferenceId="CreateUserIdForMFA" />
</InputClaimsTransformations>

Input claims

The InputClaims element must contain the following claims. You can also map the name of your claim to the name defined in the phone factor technical profile.

Data type Required Description
string Yes A unique identifier for the user. The claim name, or PartnerClaimType must be set to UserId. This claim should not contain personal identifiable information.
string Yes List of claim types. Each claim contains one phone number. If any of the input claims do not contain a phone number, the user will be asked to enroll and verify a new phone number. The validated phone number is returned as an output claim. If one of the input claims contain a phone number, the user is asked to verify it. If multiple input claims contain a phone number, the user is asked to choose and verify one of the phone numbers.

The following example demonstrates using multiple phone numbers. For more information, see sample policy.

<InputClaims>
  <InputClaim ClaimTypeReferenceId="userIdForMFA" PartnerClaimType="UserId" />
  <InputClaim ClaimTypeReferenceId="strongAuthenticationPhoneNumber" />
  <InputClaim ClaimTypeReferenceId="secondaryStrongAuthenticationPhoneNumber" />
</InputClaims>

Output claims

The OutputClaims element contains a list of claims returned by the phone factor technical profile.

Data type Required Description
boolean Yes Indicates whether the new phone number has been entered by the user. The claim name, or PartnerClaimType must be set to newPhoneNumberEntered
string Yes The verified phone number. The claim name, or PartnerClaimType must be set to Verified.OfficePhone.

The OutputClaimsTransformations element may contain a collection of OutputClaimsTransformation elements that are used to modify the output claims, or generate new ones.

Cryptographic keys

The CryptographicKeys element is not used.

Metadata

Attribute Required Description
ContentDefinitionReferenceId Yes The identifier of the content definition associated with this technical profile.
ManualPhoneNumberEntryAllowed No Specify whether or not a user is allowed to manually enter a phone number. Possible values: true, or false (default).
setting.authenticationMode No The method to validate the phone number. Possible values: sms, phone, or mixed (default).
setting.autodial No Specify whether the technical profile should auto dial or auto send an SMS. Possible values: true, or false (default). Auto dial requires the setting.authenticationMode metadata be set to sms, or phone. The input claims collection must have a single phone number.
setting.autosubmit No Specifies whether the technical profile should auto submit the one-time password entry form. Possible values are true (default), or false. When auto-submit is turned off, the user needs to select a button to progress the journey.
setting.enableCaptchaChallenge No Specifies whether CAPTCHA challenge code should be displayed in an MFA flow. Possible values: true , or false (default). For this setting to work, the CAPTCHA display control must be referenced in the display claims of the phone factor technical profile. CAPTCHA feature is in public preview.

UI elements

The phone factor authentication page user interface elements can be localized.

Next steps