By default Confluence only supports SSO through Crowd, see Single Sign-on Integration with the Atlassian stack. But luckily there's a company that has created an addon which should help you implement other SSO solutions on Confluence and JIRA: Kantega.
You can either develop your own Kerberos add-on or buy an existing one from a third-party vendor, see https://marketplace.atlassian.com/search?query=kerberos
Disclaimer: I work for the vendor of one those Kerberos plugins, you might want to take a look at our IWAAC Kerberos SSO add-on. One of its advantages is that it works on your whole Atlassian Stack (Jira, Confluence, Bamboo, Bitbucket, FishEye, Crucible) and also on non Atlassian applications such as Jenkins (actually it can be installed on any Java web app).
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