If I configure the sshd pam file with

	auth       required     /lib/security/pam_krb5.so

in the auth section, I get permissioned denied when trying to login with my
kerberos password. /var/log/secure reports:

	pam_krb5: authenticate error: Cannot read password

If I use instead

	auth       sufficient   /lib/security/pam_pwdb.so shadow
	auth       required     /lib/security/pam_krb5.so use_first_pass

it works fine. Changing to

	auth       sufficient   /lib/security/pam_pwdb.so shadow
	auth       required     /lib/security/pam_krb5.so skip_first_pass

fails as in the first example.