Chapter 15. Configuring applications for a single sign-on Single sign-on (SSO) is an authentication scheme which allows you to log into multiple systems through a single log-in procedure. You can configure browsers and email clients to use Kerberos tickets, SSL certifications, or tokens as a means of authenticating users. The configuration of different applications may vary. This chapter shows how to configure SSO authentication schema for the Mozilla Thunderbird email client and Mozilla Firefox web browser as the examples. 15.1. Prerequisites You have installed the following applications: Mozilla Firefox version 88 Mozilla Thunderbird version 78 15.2. Configuring Firefox to use Kerberos for single sign-on You can configure Firefox to use Kerberos for single sign-on (SSO) to intranet sites and other protected websites. To do so, you first have to configure Firefox to send Kerberos credentials to the appropriate Key Distribution Center (KDC). Note Even after Firefox is configured to pass Kerberos credentials, it still requires a valid Kerberos ticket to use. To generate a Kerberos ticket, use the kinit command and supply the user password for the user on the KDC. Procedure In the address bar of Firefox, type about:config to display the list of current configuration options. In the Filter field, type negotiate to restrict the list of options. Double-click the network.negotiate-auth.trusted-uris entry. Enter the name of the domain against which to authenticate, including the preceding period (.). If you want to add multiple domains, enter them in a comma separated list. Figure 15.1. Manual Firefox Configuration Additional resources For information about configuring Firefox to use Kerberos in Identity Management, see the corresponding section in the Linux Domain Identity, Authentication, and Policy Guide . 15.3. Viewing certificates in Firefox The following example shows how to view certificates in the Mozilla Firefox. To view certificates in Firefox, you need to open the Certificate Manager . Procedure In Mozilla Firefox, open the Firefox menu and select Preferences . In the left panel, select the Privacy & Security section. Scroll down to the Certificates section. Click View Certificates to open the Certificate Manager . 15.4. Importing CA certificates in Firefox The following example shows how to import certificates in the Mozilla Firefox. Prerequisites You have a CA certificate on your device. To import a CA certificate: Procedure Open Certificate Manager . Select the Authorities tab and click Import . Figure 15.2. Importing the CA Certificate in Firefox Select the downloaded CA certificate from your device. 15.5. Editing certificate trust settings in Firefox The following example shows how to edit certificate settings in the Mozilla Firefox. Prerequisites You have successfully imported a certificate. To set the certificate trust settings: Procedure Open Certificate Manager . Under the Authorities tab, select the appropriate certificate and click Edit Trust . Edit the certificate trust settings. Figure 15.3. Editing the Certificate Trust Settings in Firefox 15.6. Importing personal certificate for authentication in Firefox The following example shows how to import personal certificates for authentication in the Mozilla Firefox. Prerequisites You have a personal certificate stored on your device. To use a personal certificate for authentication: Procedure Open Certificate Manager . Select the Your Certificates tab and click Import . Figure 15.4. Importing a Personal Certificate for Authentication in Firefox Select the appropriate certificate from your computer. 15.7. Viewing certificates in Thunderbird The following example shows how to view certificates in the Mozilla Thunderbird email client. Procedure In Mozilla Thunderbird, open the main menu and select Preferences . Figure 15.5. Selecting preferences from menu In the left panel, select the Privacy & Security section. Figure 15.6. Selecting security section Scroll down to the Certificates section. Click Manage Certificates to open the Certificate Manager . Figure 15.7. Opening certificate manager 15.8. Importing certificates in Thunderbird The following example shows how to import certificates in the Mozilla Thunderbird email client. Prerequisites You have a CA certificate stored on your device. To import a CA certificate: Procedure Open Certificate Manager . Select the Authorities tab and click Import . Figure 15.8. Importing the CA certificate in Thunderbird Select the downloaded CA certificate. 15.9. Editing certificate trust settings in Thunderbird The following example shows how to edit certificate settings in the Mozilla Thunderbird email client. Prerequisites You have successfully imported a certificate. To set the certificate trust relationships: Procedure Open Certificate Manager . Under the Authorities tab, select the appropriate certificate and click Edit Trust . Edit the certificate trust settings. Figure 15.9. Editing the certificate trust settings in Thunderbird 15.10. Importing personal certificate in Thunderbird The following example shows how to import certificates for personal authentication in the Mozilla Thunderbird email client. Prerequisites You have a personal certificate stored on your device. To use a personal certificate for authentication: Procedure Open Certificate Manager . Under the Your Certificates tab, click Import . Figure 15.10. Importing a personal certificate for authentication in Thunderbird Select the required certificate from your computer. Close the Certificate Manager . Open the main menu and select Account Settings . Figure 15.11. Selecting account settings from menu Select End-To-End Encryption in the left panel under your account email address. Selecting end-to-end encryption section. Under S/MIME section click the first Select button to choose your personal certificate to use for signing messages. Under S/MIME section click the second Select button to choose your personal certificate to encrypt and decrypt messages. Choosing certificate for signing and encryption/decryption. Note In case you forgot to import valid certificate, you can open Certificate Manager directly using the Manage S/MIME certificates .

Commands:
[jsmith@host ~] USD kinit Password for jsmith@EXAMPLE.COM: