I want to configure SQUID with two authentications methods:
- Kerberos (to do SSO with posts in an ActiveDirectory domain)
- Basic (Open LDAP directory)
The LDAP directory contains all the "official" accounts of people, the AD directory contains some accounts (same identifiers as on LDAP) and generic accounts.
Everything works fine, but I would like to add an extra check: The Kerberos account must also exist in the LDAP directory in order to not allow use of generic accounts.
I managed to do that with Squid but I get this behavior:
- Account present in AD + LDAP: OK
- Account present in AD but not in LDAP: KO
Is it possible to force LDAP authentication if "check_ldap " fail ?
My config :
# KERBEROS
auth_param negotiate program /usr/lib/squid/negotiate_kerberos_auth
auth_param negotiate children 50 startup=5 idle=1
auth_param negotiate keep_alive on
# LDAP
auth_param basic program /usr/lib/squid/basic_ldap_auth -v 3 -b "ou=official" -f "(uid=%s)" ldap.contonso.lan:389
auth_param basic children 50 startup=5 idle=1
auth_param basic credentialsttl 1 hours
# Extra check
external_acl_type check_ldap ipv4 ttl=3600 children-max=50 %LOGIN /etc/squid/check_ldap_aca.sh
acl authenticated proxy_auth REQUIRED
acl check_ldap external check_ldap
http_access allow http port_80 check_ldap
http_access allow https port_443 check_ldap
http_access allow ftp port_21 check_ldap
http_access deny !authenticated
http_access deny all
My check_ldap_aca.sh :
#!/bin/bash
while read user
do
identifiant=(${user//@/ })
result=$(ldapsearch -LLL -h ldap.contonso.lan -p 389 -D "uid=usr-proxy" -w ***** -b "ou=official" "(uid=%s)" uid)
if [ ${#result} -gt 4 ]
then
echo "OK user=$identifiant"
else
echo "ERR user=$identifiant"
fi
done
Thank !
--
Chris
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