Step 1: Copy
the SAML Configuration from Identity as a ServiceMimecast is a cloud subscription service that combines solutions for email security, archiving, and continuity. See https://www.mimecast.com/. You can protect access to Mimecast by integrating Mimecast with Identity as a Service. Once integrated, users can use single sign-on to log in to their Mimecast account through Identity as a Service.
Note: This integration was tested using Identity as a Service version 5.33 and Mimecast v1.7.0-20230611_2243. Other versions of Mimecast may require integration and configuration steps that differ from those documented in this procedure. In the event of other issues, contact support@entrust.com for assistance.
Before you begin, open two browser windows, one for IDaaS and the other for Mimecast.
Step 1: Copy
the SAML Configuration from Identity as a ServiceCopy the SAML Configuration from Identity as a Service
1. Log into your Identity as a Service administrator account.
2. Click
> Security
> Applications. The Applications Lists page appears.
3. Under SAML Cloud Integrations, click SAML Configuration. The SAML Configuration dialog box appears.
This dialog box contains information you need to configure your SAML application for Identity as a Service authentication.
4. Do one of the following:
● Leave this dialog box open to reference later in this procedure.
● Copy the Entity ID, Single Sign-on URL, and Single Logout URL to a text file and save it to reference later in this procedure.
Note: Depending on the integration you are performing, you may not need all three of these SAML configuration values.
Step
2: Copy the signing certificate from Identity as a ServiceCopy a SAML signing certificate
1. Log in to your Identity as a Service administrator account.
2. Click
> Security
> Applications. The Applications List page
appears.
3. Under SAML Cloud Integrations, click SAML Signing Certificates. The SAML Signing Certificates page appears.
4. Click
next to the certificate to copy it to the
clipboard.
You can additionally download the certificate and save it for future use.
5. Open a text editor, such as Notepad, and paste the contents of the certificate into the text file.
6. Save the file.
Step
3: Configure Mimecast for Identity as a Service authenticationConfigure Mimecast for Identity as a Service single sign-on
1. Log in to Mimecast as an administrator.
2. Go to My Apps.
3. Click Administration Console. The Administration Console Home page appears.
4. Click Services. The Services > Applications page appears.
5. Click Authentication Profiles and then click New Authentication Profile.
6. In the Description field, enter a name for the application, for example, SAML_SSO.
7. From the Allow Cloud Authentication drop-down list, select Allow Always.
8. Select Enforce SAML Authentication for End User Applications if you want Administrators to always log in to the Administration Console using an Identity Provider and then complete the following:
a. In the Issuer URL, enter the Entity ID URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
b. Set the Identity Mapping to EMAIL.
c. In the Login URL, enter the Single Sign-ON URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
d. In the Logout URL, enter the Single Logout URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
e. In the Identity Provider Certificate (Metadata) field, paste the certificate you copied in Step 2: Copy the SAML signing certificate from Identity as a Service.
f. Select the Allow Single Sign On checkbox to enable Single Sign On for Administrator Users.
g. Leave the remaining settings at the default values.
9. Select Enforce SAML Authentication for Mimecast Web Apps if you want users to always log in to the Mimecast Web Apps using an Identity Provider, and then complete the following:
a. In the Issuer URL, enter the Entity ID URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
b. Set the Identity Mapping to EMAIL.
c. In the Login URL, enter the Single Sign-ON URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
d. In the Logout URL, enter the Single Logout URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
e. In the Identity Provider Certificate (Metadata) field, paste the certificate you copied in Step 2: Copy the SAML signing certificate from Identity as a Service.
f. Select the Allow Single Sign On checkbox to enable Single Sign-on for Administrator users.
g. Leave the remaining settings at the default values.
10. Select Enforce SAML Authentication for End User Applications if you want users to always log in to the End User Applications using an Identity Provider, and then complete the following:
a. In the Issuer URL, enter the Entity ID URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
b. Set the Identity Mapping to EMAIL.
c. In the Login URL, enter the Single Sign-ON URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
d. In the Logout URL, enter the Single Logout URL that you copied in Step 1: Copy the SAML configurations from Identity as a Service.
e. In the Identity Provider Certificate (Metadata) field, paste the certificate you copied in Step 2: Copy the SAML signing certificate from Identity as a Service.
f. Select the Allow Single Sign On checkbox to enable Single Sign-on for end users.
g. Leave the remaining settings at the default values.
11. Click on Save and Exit.
12. Click Go Back to return to the Applications page.
13. Click New Application Settings. The Common Applications Settings page appears.
a. Under Description, enter a name for the profile, for example, SAML_SSO.
b. Next to Group, click Lookup and select the desired group from the list, for example, Permitted Senders. User under this group need to be present in IDaaS.
c. Next to Authentication Profile, click Lookup and select the Authentication Profile that you created in step 6 (for example, SAML_SSO).
d. Leave the remaining settings at the default values.
14. Click on Save and Exit.
Step 4: Add
Mimecast to Identity as a ServiceAdd Mimecast as an application to Identity as a Service
1. Log into your Identity as a Service administrator account.
2. Click
> Security > Applications. The Applications
Lists page appears.
3. Click Add. The Select an Application Template page appears.
4. Do one of the following:
● Select SAML Cloud Integrations from the search drop-down list and scroll to find the application you want to add to IDaaS.
- or -
● In the Search bar, enter a search option to filter for the application you want to add to IDaaS.
5. Click Mimecast. The Add Mimecast page appears.
6. Enter an Application Name.
7. Enter an Application Description.
8. Optional. Add a custom application logo.
a. Click 
next to Application Logo. The
Upload Logo dialog box appears.
b. Click 
to
select an image file to upload.
c. Browse to select your file and click Open. The Upload Logo dialog box reappears showing your selected image.
d. If required, resize your image.
e. Click OK.
9. Select the Authentication Flow that appears to users during login.
10. Click Next. The General page appears.
11. For the next steps, refer to https://community.mimecast.com/s/article/email-security-cloud-gateway-global-saml-urls-and-audience-values for the values required for the fields.
a. In the Default Assertion Consumer Service URL, enter the URL for your region. You can find this information in the provided link under Destination > End User Applications.
Example: If your region is the United States, you would enter https://us-api.mimecast.com/login/saml
b. In the Service Provider Entity ID field, enter the URL value for your region. You can find this information in the provided link under End User Applications.
Example: If your region is the United States, you would enter us-api.mimecast.com.<ACCOUNTCODE> where <ACCOUNTCODE> is the code assigned to your Mimecast account. You can find your account code in Mimecast by going to Administration > Account > Account Settings.
12. Enter the SAML Session Timeout to the time when the SAML Assertion times out. The maximum is 720 minutes.
13. Enter the Max Authentication Age (seconds) to set the maximum amount of time that can elapse before a user is required to reauthenticate during a new login attempt. This applies for both SP-initiated and IDP-initiated login. Set this field to -1 to disable this feature.
14. From the SAML NameID Attribute drop-down list, select Email.
15. From the SAML NameID Encoding Format drop-down list, select Email.
16. Select the SAML Signing Certificate that you copied in Step 2: Copy the SAML signing certificate from Identity as a Service.
17. Deselect Enable Go Back Button if you do not want users to be able to go back to the Mimecast login page to log in.
18. Select Show Default Assertion Consumer URL Service in the My Profile. When selected, the Default Assertion Consumer URL appears in a user's My Profile page in addition to relay states and Alternative Assertion Consumer URLs.
19. Add Alternate Assertion consumer Service URL(s) each for Administration Console and Mimecast Personal Portal.
● Example for the Administration Console: https://us-api.mimecast.com/login/sso/adcon
● Example for Mimecast Personal Portal: https://us-api.mimecast.com/login/sso/mpp
20. Add SAML Attributes as follows:
Add the First Name attribute:
a. Under SAML Attributes, click Add. The SAML Attributes dialog box appears.
b. In the Name field enter Email.
c. Click Add next to Value(s).
d. In the Values field, type < and select Email.
e. Click Add.
Add the Last name attribute:
a. Under SAML Attributes, click Add. The SAML Attributes dialog box appears.
b. In the Name field enter NameID.
c. Click Add next to Value(s).
d. In the Values field, type < and select Email.
e. Click Add.
21. Leave the remaining settings at the default values.
22. Click Submit.
Step 6: Test
the integrationTest Service Provider login
1. Open a Web browser and enter the URL for your Mimecast. Click on Login. You are directed to Mimecast Login page.
2. Enter the Mimecast account email.
3. Click Next.
4. Respond to the second-factor authentication challenge. If you respond successfully, you are logged in to the Mimecast.
Test Identity as a Service redirect log in
1. Log in to your Identity as a Service account.
2. Go to your My Profile page if you are not already there.
3. Under Applications, click the Mimecast account you want to access if you have more than one.
4. Respond to the second factor authentication challenge. If you respond successfully, you are logged in to Mimecast.