new user registration process

Trying to understand the new user registration process. When the site authenticates against an external provider and creates a user in the wordpress users table, what password is it storing in the wordpress users table?

Essentially, does the wordpress users table get populated with whatever ldap/google/etc password the user had when they registered their account on the WP site, or is some other dummy/gibberish password stored locally?

Essentially, the concern is how much security we need to build around our wordpress database. If it’s effectively caching first-time-reg passwords, we have to follow far more stringent security policies around the site design and maintenance (and our security team may straight up veto the option).