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Introduction
Penrose can be used as the authentication service for Linux using PAM LDAP
(pam_ldap). See Naming Service for Linux.
Installing PAM LDAP
Some system comes with PAM LDAP installed already. On Red Hat it's part of the nss_ldap package. If your system doesn't have it already, you need to download and install the binaries.
Debian:
apt-get install libpam-ldap
Alternatively, you can build from the source code:
./configure make make install
Configuring PAM LDAP
You can use configure PAM manually by editing /etc/pam.d/system-auth or use the authconfig tool. Here is an example of PAM configuration.
auth required pam_env.so auth sufficient pam_unix.so nullok try_first_pass auth requisite pam_succeed_if.so uid >= 500 quiet auth sufficient pam_ldap.so use_first_pass auth required pam_deny.so account required pam_unix.so broken_shadow account sufficient pam_succeed_if.so uid < 500 quiet account [default=bad success=ok user_unknown=ignore] pam_ldap.so account required pam_permit.so password requisite pam_cracklib.so try_first_pass retry=3 password sufficient pam_unix.so md5 shadow nullok try_first_pass use_authtok password sufficient pam_ldap.so use_authtok password required pam_deny.so session optional pam_keyinit.so revoke session required pam_limits.so session [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid session required pam_unix.so session optional pam_ldap.so