Although sauoq has alredy answered your question, I'd like to point out few things that you might find useful:

• Rarely this days passwords are stored in /etc/passwd. Most probably you'll need to make use of /etc/shadow.
• Rarely this days system passwords are stored plainly crypt()-ed. Most probably you'll need to work with MD5 or some other stronger cryptography.
• If your system is using PAM, then you should do so too. Cpan has modules for you. With PAM you will not have to care about crypt/md5, /etc/passwd or /etc/shador, or even LDAP authentication for that matter.

Leonid Mamtchenkov aka TVSET

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