Changing a password using PAM as root.

[Jeremy Allison]

I'm trying to fix up the "unix password sync" code in Samba
2.2.1, which uses PAM to change the UNIX password once it is
verified the user knew the old SMB password.

smbd is running as root, but I consistently get the message :

PAM: unable to obtain the old authentication token - was the old password
wrong?.

as pam is returning PAM_AUTHTOK_RECOVER_ERR to me from
the pam_chauthtok() call.

smbd doesn't know the plaintext of the old password, but is
running as root so shouldn't need to. Can anyone point me
to some docs to learn the magic to make linux pam allow a
password change as root without the old password (and yes
I'm perusing the pam source code, haven't found it yet, which
is why I'm asking here :-).

Regards,

	Jeremy Allison,
	Samba Team.

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