1) Download the mod_auth_pam module : here
2) Installing mod_auth_pam
# tar xzf mod_auth_pam.tar.gz
# cd mod_auth_pam-1.0a
# make
# make install
3) Configure PAM
Here’s what the /etc/pam.d/httpd looks like
auth required pam_unix.so
auth required pam_unix.so
account required pam_unix.so
4) Configuring Apache
Now that PAM is configured to authenticate apache’s requests, we’ll configure apache to properly utilize PAM authentication to restrict access to a specific directory. To do so, add the following lines to your httpd.conf (usually stored in /etc/apache/ or /etc/httpd):
AuthPAM_Enabled on
AllowOverride None
AuthName “Secrets”
AuthType “basic”
5) Restart the apache to put configuration to effect
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source:http://linuxpoison.blogspot.com/2007/10/1357817580282.html