Configure complexity requirements for passwords in Azure Active Directory B2C

מאמר
01/11/2024

Before you begin, use the Choose a policy type selector at the top of this page to choose the type of policy you’re setting up. Azure Active Directory B2C offers two methods to define how users interact with your applications: through predefined user flows or through fully configurable custom policies. The steps required in this article are different for each method.

Azure Active Directory B2C (Azure AD B2C) supports changing the complexity requirements for passwords supplied by an end user when creating an account. By default, Azure AD B2C uses Strong passwords. Azure AD B2C also supports configuration options to control the complexity of passwords that customers can use.

Prerequisites

Create a user flow so users can sign up and sign in to your application.
Register a web application.

Complete the steps in Get started with custom policies in Active Directory B2C. This tutorial guides you how to update custom policy files to use your Azure AD B2C tenant configuration.
Register a web application.

Password rule enforcement

During sign-up or password reset, an end user must supply a password that meets the complexity rules. Password complexity rules are enforced per user flow. It's possible to have one user flow require a four-digit pin during sign-up while another user flow requires an eight character string during sign-up. For example, you may use a user flow with different password complexity for adults than for children.

Password complexity is never enforced during sign-in. Users are never prompted during sign-in to change their password because it doesn't meet the current complexity requirement.

You can configure password complexity in the following types of user flows:

Sign-up or Sign-in user flow
Password Reset user flow

If you're using custom policies, you can configure password complexity in a custom policy.

Configure password complexity

Sign in to the Azure portal.
If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.
In the Azure portal, search for and select Azure AD B2C.
Select User flows.
Select a user flow, and click Properties.
Under Password complexity, change the password complexity for this user flow to Simple, Strong, or Custom.

Comparison Chart

Complexity	Description
Simple	A password that's at least 8 to 64 characters.
Strong	A password that's at least 8 to 64 characters. It requires 3 out of 4 of lowercase, uppercase, numbers, or symbols.
Custom	This option provides the most control over password complexity rules. It allows configuring a custom length. It also allows accepting number-only passwords (pins).

Custom options

Character Set

Allows you to accept digits only (pins) or the full character set.

Numbers only allows digits only (0-9) while entering a password.
All allows any letter, number, or symbol.

Length

Allows you to control the length requirements of the password.

Minimum Length must be at least 4.
Maximum Length must be greater or equal to minimum length and at most can be 256 characters.

Character classes

Allows you to control the different character types used in the password.

2 of 4: Lowercase character, Uppercase character, Number (0-9), Symbol ensures the password contains at least two character types. For example, a number and a lowercase character.
3 of 4: Lowercase character, Uppercase character, Number (0-9), Symbol ensures the password contains at least three character types. For example, a number, a lowercase character and an uppercase character.
4 of 4: Lowercase character, Uppercase character, Number (0-9), Symbol ensures the password contains all for character types.

Note

Requiring 4 of 4 can result in end-user frustration. Some studies have shown that this requirement does not improve password entropy. See NIST Password Guidelines

Password predicate validation

To configure the password complexity, override the newPassword and reenterPassword claim types with a reference to predicate validations. The PredicateValidations element groups a set of predicates to form a user input validation that can be applied to a claim type. Open the extensions file of your policy. For example, SocialAndLocalAccounts/TrustFrameworkExtensions.xml.

Search for the BuildingBlocks element. If the element doesn't exist, add it.
Locate the ClaimsSchema element. If the element doesn't exist, add it.

Add the newPassword and reenterPassword claims to the ClaimsSchema element.

<!-- 
<BuildingBlocks>
  <ClaimsSchema> -->
    <ClaimType Id="newPassword">
      <PredicateValidationReference Id="CustomPassword" />
    </ClaimType>
    <ClaimType Id="reenterPassword">
      <PredicateValidationReference Id="CustomPassword" />
    </ClaimType>
  <!-- 
  </ClaimsSchema>
</BuildingBlocks>-->

Predicates defines a basic validation to check the value of a claim type and returns true or false. The validation is done by using a specified method element, and a set of parameters relevant to the method. Add the following predicates to the BuildingBlocks element, immediately after the closing of the </ClaimsSchema> element:

<!-- 
<BuildingBlocks>-->
  <Predicates>
    <Predicate Id="LengthRange" Method="IsLengthRange">
      <UserHelpText>The password must be between 6 and 64 characters.</UserHelpText>
      <Parameters>
        <Parameter Id="Minimum">6</Parameter>
        <Parameter Id="Maximum">64</Parameter>
      </Parameters>
    </Predicate>
    <Predicate Id="Lowercase" Method="IncludesCharacters">
      <UserHelpText>a lowercase letter</UserHelpText>
      <Parameters>
        <Parameter Id="CharacterSet">a-z</Parameter>
      </Parameters>
    </Predicate>
    <Predicate Id="Uppercase" Method="IncludesCharacters">
      <UserHelpText>an uppercase letter</UserHelpText>
      <Parameters>
        <Parameter Id="CharacterSet">A-Z</Parameter>
      </Parameters>
    </Predicate>
    <Predicate Id="Number" Method="IncludesCharacters">
      <UserHelpText>a digit</UserHelpText>
      <Parameters>
        <Parameter Id="CharacterSet">0-9</Parameter>
      </Parameters>
    </Predicate>
    <Predicate Id="Symbol" Method="IncludesCharacters">
      <UserHelpText>a symbol</UserHelpText>
      <Parameters>
        <Parameter Id="CharacterSet">@#$%^&amp;*\-_+=[]{}|\\:',.?/`~"();!</Parameter>
      </Parameters>
    </Predicate>
  </Predicates>
<!-- 
</BuildingBlocks>-->

Add the following predicate validations to the BuildingBlocks element, immediately after the closing of the </Predicates> element:

<!-- 
<BuildingBlocks>-->
  <PredicateValidations>
    <PredicateValidation Id="CustomPassword">
      <PredicateGroups>
        <PredicateGroup Id="LengthGroup">
          <PredicateReferences MatchAtLeast="1">
            <PredicateReference Id="LengthRange" />
          </PredicateReferences>
        </PredicateGroup>
        <PredicateGroup Id="CharacterClasses">
          <UserHelpText>The password must have at least 3 of the following:</UserHelpText>
          <PredicateReferences MatchAtLeast="3">
            <PredicateReference Id="Lowercase" />
            <PredicateReference Id="Uppercase" />
            <PredicateReference Id="Number" />
            <PredicateReference Id="Symbol" />
          </PredicateReferences>
        </PredicateGroup>
      </PredicateGroups>
    </PredicateValidation>
  </PredicateValidations>
<!-- 
</BuildingBlocks>-->

Disable strong password

The following technical profiles are Active Directory technical profiles, which read and write data to Microsoft Entra ID. Override these technical profiles in the extension file. Use PersistedClaims to disable the strong password policy. Find the ClaimsProviders element. Add the following claim providers as follows:

<!-- 
<ClaimsProviders>-->
  <ClaimsProvider>
    <DisplayName>Azure Active Directory</DisplayName>
    <TechnicalProfiles>
      <TechnicalProfile Id="AAD-UserWriteUsingLogonEmail">
        <PersistedClaims>
          <PersistedClaim ClaimTypeReferenceId="passwordPolicies" DefaultValue="DisablePasswordExpiration, DisableStrongPassword"/>
        </PersistedClaims>
      </TechnicalProfile>
      <TechnicalProfile Id="AAD-UserWritePasswordUsingObjectId">
        <PersistedClaims>
          <PersistedClaim ClaimTypeReferenceId="passwordPolicies" DefaultValue="DisablePasswordExpiration, DisableStrongPassword"/>
        </PersistedClaims>
      </TechnicalProfile>
    </TechnicalProfiles>
  </ClaimsProvider>
<!-- 
</ClaimsProviders>-->

If you use the username based sign-in policy, update the AAD-UserWriteUsingLogonEmail, AAD-UserWritePasswordUsingObjectId, and LocalAccountWritePasswordUsingObjectId technical profiles with the DisableStrongPassword policy.

Save the policy file.

Test your policy

Upload the files

Sign in to the Azure portal.
If you have access to multiple tenants, select the Settings icon in the top menu to switch to your Azure AD B2C tenant from the Directories + subscriptions menu.
Choose All services in the top-left corner of the Azure portal, and then search for and select Azure AD B2C.
Select Identity Experience Framework.
On the Custom Policies page, select Upload Policy.
Select Overwrite the policy if it exists, and then search for and select the TrustFrameworkExtensions.xml file.
Select Upload.

Run the policy

Open the sign-up or sign-in policy such as B2C_1A_signup_signin.
For Application, select your application that you previously registered. To see the token, the Reply URL should show https://jwt.ms.
Select Run now.
Select Sign up now, enter an email address, and enter a new password. Guidance is presented on password restrictions. Finish entering the user information, and then select Create. You should see the contents of the token that was returned.

Next steps

Learn how to Configure password change in Azure Active Directory B2C.
Learn more about the Predicates and PredicateValidations elements in the IEF reference.

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