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Two-Factor Authentication (2FA) for Slack


Slack 2FA (Two-Factor Authentication) or Multi-Factor Authentication (MFA) is an additional layer of security in which a user or an organizational employee have to provide two factors to gain access to the Slack account. With Slack TFA being enabled, anyone trying to login to your Slack account from an unrecognized computer/device must provide additional authorization. Authentication starts with a user submitting his traditional username and password. Once the user successfully gets authenticated with the 1st step verification, configured 2FA (OTP over SMS, Push Notifications, Yubikey, TOTP, Google Authenticator etc) method prompts for 2nd-step verification. After successfully authenticating with both of the steps a user is granted with the access to the Slack account. This extra layer prevents the unauthorized person from accessing the resources even if cyber attackers get to know your credentials.

miniorange provides 15+ authentication methods and solutions for various use cases. It allows users and organizations to set up certain authentication and settings which includes password restrictions, restricting sign-in methods, as well as other security settings. miniorange also makes way for authentication apps that support Time-Based One-Time Password (TOTP) Google Authenticator, Microsoft Authenticator, Authy 2-Factor authentication app and our own miniorange Authenticator app.


Connect with External Source of Users


miniOrange provides user authentication from various external sources, which can be Directories (like ADFS, Microsoft Active Directory, Azure AD, OpenLDAP, Google, AWS Cognito etc), Identity Providers (like Shibboleth, Ping, Okta, OneLogin, KeyCloak), Databases (like MySQL, Maria DB, PostgreSQL) and many more.



Apps supported by miniOrange



two factor authentication (2FA) miniOrange authenticator app

miniOrange
Authenticator App

   
two factor authentication (2FA) google authenticator app

Google
Authenticator App

   
two factor authentication (2FA) authy authenticator app

Authy 2-Factor
Authentication App

   
two factor authentication (2FA) Microsoft authenticator app

Microsoft
Authenticator App

   

Follow the Step-by-Step Guide given below for Slack Single Sign-On (SSO)

1. Configure Slack in miniOrange

  • Login into miniOrange Admin Console.
  • Go to Apps and click on Add Application button.
  • Slack Single Sign-On (SSO) add app

  • In Choose Application Type click on Create App button in SAML/WS-FED application type.
  • Slack Single Sign-On (SSO) choose app type

  • Search for Slack in the list, if you don't find Slack in the list then, search for custom and you can set up your application via Custom SAML App.
  • Slack Single Sign-On (SSO) manage apps

  • Get the SP Entity ID or Issuer from the metadata. You will find the value in the first line against entityID.
  • SP Entity:
  • https://slack.com
  • Make sure the ACS URL is in the format: .
  •  https://[Your-Domian].slack.com/sso/saml
  • Enable Sign Assertion as shown in the image below.
  • Slack 2FA/MFA : Add app

  • Click Next, now in the Attribute Mapping configure the following attributes as shown in the image below.
  • Add attribute email and select E-mail Address from the dropdown
  • Slack 2FA/MFA :  Add Attribute

  • Go to the Login Policy and select DEFAULT from the Group Name dropdown.
  • Now enter the Slack in the Policy Name field.
  • Select PASSWORD from the First Factor Type dropdown.
  • Click on Save to configure Slack.
  • Click on Metadata to get metadata details, which will be required later. Click on Show SSO Link to see the IDP initiated SSO link for Slack.
  • Slack 2FA/MFA : Go to Metadata link Slack SAML SSO

  • Here you will see 2 options, if you are setting up miniOrange as IDP copy the metadetails related to miniOrange, if you required to be authenticated via external IDP's(okta,AZURE AD, ADFS, ONELOGIN, GOOGLE APPS) you can get metadata from the 2nd Section as shown below.
  • Slack 2FA/MFA : Add SAML Application

  • Keep SAML Login URL , SAML Logout URL and click on the Download Certificate button to download certificate which you will require in Step 2.
  • Slack 2FA/MFA : Select Metadata details external IDP or miniOrange as IDP

2. Configure SSO in Slack

  • Login to Slack as the system administrator.
  • Prepare your Slack instance for SSO & SAML Authentication
  • Navigate to Administration > Workspace settings:
  • Slack 2FA/MFA : admin login

  • Select Authentication

  • Click on Configure for SAML Authentication.
  • Slack 2FA/MFA : configuration

  • Enter the following to configu the app.
  • SAML 2.0 Endpoint (HTTP): Copy and paste the following from Step 1.
  • Sign into the miniorange Admin dashboard to generate this value under apps metadata
  • Identity Provider Issuer: Copy and paste the following:
  • Sign into the miniorange Admin dashboard to generate this value under apps metadata
  • Certificate: Copy and paste the following:
  • Sign into the miniorange Admin dashboard to generate this value under apps metadata
    Slack 2FA/MFA : saml app settings

  • Under Advanced Options, use the default value for the Service Provider Issuer.
  • It must be
    https://slack.com.
  • Slack 2FA/MFA : saml advance settings

  • Enter the customize login text. It will appear as login button in slack.
  • Put login with miniOrange.
  • Slack 2FA/MFA : saml advance settings

  • Done!

3. Configure 2FA for Slack

    3.1: Configure 2FA for miniOrange Admin Dashboard.

    • From your miniOrange Dashboard in the left navigation bar, select 2- Factor Authentication, click on Configure 2FA.

    • Two factor-authentication for Slack | configure_2fa

    • Choose any 2FA method you want to configure.
    • Let's say you want to configure OTP over SMS
    • Click on OTP over SMS
    • Two factor-authentication for Slack  | otp_over_sms

      Two factor-authentication for Slack  | enter_phone_no

    • Now add your mobile number on which you want to receive the OTP.
    • Then click on Save.
    • Two factor-authentication for Slack  | save_phone_number

      Two factor-authentication for Slack  | otp_over_sms_active

    • Now as shown in the above image, OTP over SMS is your Active 2FA method.
    • Enable Prompt for second factor during signin to your console.
    • Then click on Save.
    • Two factor-authentication for Slack  | enable_2fa

    • To verify the configuration login again.
    • You will be asked for Username and password then it is redirected to below page:
    • Enter the OTP received on the phone and click on verify.
    • Two factor-authentication for Slack  |  2fa_otp_verification

    • If you are redirected to your dashboard, you have successfully configured OTP over SMS as your 2FA method.
    • Similarly you can configure rest of the 2FA methods for miniOrange dashboard by following this guide.
    • To configure 2FA methods for end-users, You can find the guide here.

    3.2: Enable 2FA for Users of Slack application.

    • To enable 2FA for Users of Slack application. Go to Policies >> App Authentication Policy
    • Click on Edit against the configured application
    • Two factor-authentication for Slack | Two Factor Authentication configure 2fa of application

    • Enable the Enable 2-Factor Authentication (MFA) option.
    • Two factor-authentication for Slack | Two Factor Authentication enable 2fa

    • Click on Save.

4. Test Slack 2FA

  • Go to your Slack Domain. It will redirect you to miniOrange Single Sign-On Service console.
  • zoom two factor authentication(2fa) user credentials

  • Enter your miniOrange login credentials and click on Login.
  • Since we have Two-factor authentication(2FA) enabled, you will be prompted to register for it. It's a one time process.
  • Configure your basic details.
  • zoom two factor authentication(2fa) user registration

  • Configure any authentication method of your choice.
  • zoom two factor authentication(2fa) add new security

  • After successful registration, you will be logged in to your Slack account.
  • Now we have Two-factor authentication enabled.
  • To verify your Two-factor authentication(2FA) configuration, go to your Slack Domain. You will be redirected to miniOrange login console.
  • zoom two factor authentication(2fa) verify user credentials

  • Enter your login credentials, and click on login. It will prompt to verify yourself against the configured 2fa method.
    e.g. If you have configured OTP over SMS, after login into Slack it will prompt for OTP.
  • zoom two factor authentication(2fa) otp prompt

  • Enter the OTP received in your phone, after successful 2fa verification, you will be redirected to the Slack dashboard.

  • Not able to configure or test MFA?


    Contact us or email us at idpsupport@xecurify.com and we'll help you setting it up in no time.


5. Adaptive Authentication with Slack

A. Restricting access to Slack with IP Blocking

    You can use adaptive authentication with Slack Single Sign-On (SSO) to improve the security and functionality of Single Sign-On. You can allow a IP Address in certain range for SSO or you can deny it based your requirements and you can also challenge the user to verify his authenticity. Adaptive authentication manages the user authentication bases on different factors such as Device ID, Location, Time of Access, IP Address and many more.

    You can configure Adaptive Authentication with IP Blocking in following way:
  • Login to Self Service Console >> Adaptive Authentication.
  • Add a Policy Name for your Adaptive Authentication Policy.
  • Slack Single Sign-On (SSO) Restrict Access adaptive authnetication policy

  • Select your Action for behaviour Change and Challenge Type for user from the Action for behaviour Change Section.
  • Slack Single Sign-On (SSO) Restrict Access adaptive authentication behaviour change


    Action for behaviour Change Options :


    Attribute Description
    Allow Allow user to authenticate and use services if Adaptive authentication condition is true.
    Challenge Challenge users with one of the three methods mentioned below for verifying user authenticity.
    Deny Deny user authentications and access to services if Adaptive authentication condition is true.

    Challenge Type Options :

    Attribute Description
    User second Factor The User needs to authenticate using the second factor he has opted or assigned for such as
  • OTP over SMS
  • PUSH Notification
  • OTP over Email
  • And 12 more methods.
  • KBA (Knowledge-based authentication) The System will ask user for 2 of 3 questions he has configured in his Self Service Console. Only after right answer to both questions user is allowed to proceed further.
    OTP over Alternate Email User will receive a OTP on the alternate email he has configured threw Self Service Console. Once user provides the correct OTP he is allowed to proceed further.

  • Now Enable Enable IP Restriction option from the IP RESTRICTION CONFIGURATION section to configure custom IP range.
  • Slack Single Sign-On (SSO) Restrict Access adaptive authentication ip blocking

  • Select the Action you want to perform if the IP address is out of the range. i.e. Allow, Challenge & Deny.
  • Specify the IP Address range for which you want above setting to reflect. You can add more than one IP Address ranges by clicking on following button +.
  • Scroll to the end and click on save.


B. Adaptive Authentication with Limiting number of devices.

    Using Adaptive Authentication you can also restrict the number of devices the end user can access the Services on. You can allow end users to access services on a fixed no. of devices. The end users will be able to access services provided by us on this fixed no. of devices.

    You can configure Adaptive Authentication with Device Restriction in following way

  • Login to Self Service Console >> Adaptive Authentication.
  • Add a Policy Name for your Adaptive Authentication Policy.
  • Select your Action for behaviour Change and Challenge Type for user from the Action for behaviour Change Section.
  • Slack Single Sign-On (SSO) Restrict Access adaptive authentication behaviour and challenge type


  • Scroll down to Device Configuration section and enable Allow User to Register Device option to allow users to register their devices.
  • Enter the Number of Devices which are allowed to register in field next to Number of Device Registrations Allowed
  • Choose Action if number of devices exceeded (This will override your setting for Action for Behaviour Change.)
    1. Challenge: The user needs to verify himself using any of the three methods mentioned in table in step 5.1
    2. Deny : Deny users access to the system
  • Enable option Send email alerts to Users if number of Device registrations exceeded allowed count if you want to alert the user about no of devices exceeding the limit. Save the configuration.
  • Slack Single Sign-On (SSO) Restrict Access adaptive authentication enable device restriction


C. Add Adaptive Authentication policy to Slack.

  • Login to Self Service Console >> Policies.
  • Click on Edit option for predefined SAML app policy.
  • Slack Single Sign-On (sso) edit device restriction policy

  • Set your application name in the Application and select password as Login Method.
  • Enable Adaptive Authentication on Policy page and select the required restriction method as an option.
  • From Select Login Policy dropdown select the policy we created in last step and click on save.
  • Slack Single Sign-On (SSO) Restrict Access save device restriction policy

    How to add a trusted Device
    1. When End-user log in to the self service console after the policy for device restriction is on, he is provided the option to add the current device as a trusted device.

External References

Our Other Identity & Access Management Products