[Bug 263045] sshd password configuration options are unclear

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263045

--- Comment #9 from Ed Maste <emaste@freebsd.org> ---
Some more details:

PasswordAuthentication is handled by auth2-passwd.c and auth-passwd.c, and
auth-pam.c, which uses sshpam_auth_passwd() if UsePAM is true, else it uses
crypt(3) and compares against the passwd entry. In effect, sshd requests a user
name and a password, and then passes them to pam or checks the password itself.
The PasswordAuthentication scheme is described in RFC 4252.

KbdInteractiveAuthentication is handled by auth2-kbdint.c, auth2-chall.c, and
auth-pam.c. In this case sshpam_thread() calls pam_authenticate(), and the
authentication is driven by pam, not by sshd. This scheme is described in RFC
4256, Generic Message Exchange Authentication for the Secure Shell Protocol."

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