This is untested, but the problem might be this:
pam-0.79/Linux-PAM/modules/pam_unix/support.c: _unix_blankpasswd
contains the following:
if ((retval == 1) && on(UNIX_NULLOK_SECURE, ctrl)) {
int retval2;
const char *uttyname;
retval2 = pam_get_item(pamh, PAM_TTY, (const void **)&uttyname);
if (retval2 != PAM_SUCCESS || uttyname == NULL)
return 0;
if (_pammodutil_tty_secure(uttyname) != PAM_SUCCESS)
return 0;
}
It appears that the tty is always checked if the password is blank.
Can anybody confirm that this is, in fact, the problem? Why is this check
performed?
--
users with no password can't log in with gdm
https://bugs.launchpad.net/bugs/104957
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