Re: verify login info on Windows

[Igor Pechtchanski <pechtcha at cs dot nyu dot edu>]

On Mon, 18 Jul 2005, H. Henning Schmidt wrote:

> I am developing a server application that accepts logins from a client
> over a proprietary protocol.
> I want to let clients login (username/password) before allowing anything
> else.  I want to let them use username/password information as it is
> stored in the regular system user database, so I do not need to maintain
> another such database.  On Unix this would be /etc/passwd or
> /etc/shadoww and the associated libraray calls.
>
> However, on my Cygwin box, the /etc/passwd (as created by mkpasswd) does
> not contain the password. Instead the appropriate field reads
> unused_by_nt. After googling along for a while I have understood that
> this is done so that the real login/security info can be maintained by
> the regular windows system.  Fine. But how do I get to it? I have not
> found any example/explanation that answers this question:
>
> given two const char* variables user and password, how can I find out if
> this combination is a valid login on this current Windows/Cygwin box?
>
> This might be a pute Windows issue (as oposed to Cygwin) ... however,
> with a Linux-only knowledge of system calls, I have no clue how to
> approach this anyways.

How about looking at the source of some program that actually does such
authentication?  Searching for the string "cygwin" in auth-passwd.c in
openssh sources is one approach.
	Igor
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