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synchronisation password ldap/nis


I thought I could find discussions or docs about synchronisation of
password between ldap and nis, but i did'nt find something relevant in
the lists archive or google ...

I think of 2 solutions:

1) develop a script  (perl ...) , before I do this, please let me know
if some exists.

2) use PAM, I can change the password in ldap, thanks to pam_ldap

$cat /etc/pam.d/passwd
auth       sufficient	/lib/security/pam_ldap.so
auth       required     /lib/security/pam_unix_auth.so use_first_pass
account    sufficient	/lib/security/pam_ldap.so
account    required     /lib/security/pam_unix_acct.so
password   required	/lib/security/pam_cracklib.so retry=3 type=Ldap/Unix
password   sufficient	/lib/security/pam_ldap.so use_authtok
password   required     /lib/security/pam_pwdb.so try_first_pass

(Notice I've added "use_authtok" for password, default file doesn't
include that !!)

Now I hope that I can stack modules so that password is changed either
in ldap and nis, but does anyone knows how to stack them.

adding a :

password   required	/lib/security/pam_unix

is it possible to do ?

Jehan Procaccia
Institut National des Telecommunications| Email:
MCI, Moyens Communs Informatiques	| Tel  : +33 (0) 160764436 
9 rue Charles Fourier 91011 Evry France | Fax  : +33 (0) 160764321