The best way to do this would be to expose your "user database" to Jira as though it is another directory. Does this database have any way to present itself as an AD or LDAP directory? Could you set up a simple LDAP server based on it?
If that's not going to work, then you'll need to write an authenticator add-on for Jira and replace its internal one.
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs