Ceci est setup avec Squid 3.0, has aussi been tested avec Squid 3.1 et should work avec Squid 2.7. Your Windows user must be a member of le SQUID_USERS group in Active Directory (for this case anyway).
On le Windows side, Windows XP et Windows 2007 have been tested against Windows 2008, et Windows XP against Windows 2003.
Note that almost chaque step requires le one avant it to proceed.
If you have a problem, DNS is always le premier place to look. Both Windows machines should be able to ping le Linux server by name (and vice versa), et you may need to run ipconfig /flushdns at times. A reboot may help too, si you want to be really sure il y a no cruft hanging around.
Domain info
Windows domain: dom.local
Domain server: server.dom.local, 172.17.3.11
CentOS squid server: centos.dom.local, 172.17.3.10
Domain server setup
Create dom.local reverse zone in le DNS config.
Create static ('A') record for centos.dom.local pointing to 172.17.3.10, select Yes quand asked si you want to setup le reverse PTR as well.
Windows 2008
For Windows 2008 server you need to install Hotfix 951191.
Linux Setup
Minor packages
Install packages
$ yum install -y cyrus-sasl-gssapi cvs autoconf automake openldap openldap-devel krb5-workstation krb5-devel gcc-c++
Install msktutil. Vous devez to patch it avant you build it.
$ wget http://download.systemimager.org/~finley/msktutil/msktutil_0.3.16.orig.tar.gz
$ wget http://download.systemimager.org/~finley/msktutil/msktutil_0.3.16-7.diff.gz
$ gunzip msktutil_0.3.16-7.diff.gz
$ tar zxf msktutil_0.3.16.orig.tar.gz
$ cd msktutil-0.3.16
$ patch < ../msktutil_0.3.16-7.diff
$ ./configure && make && make install
Compile le latest squid_kerb_ldap.
$ cvs -z3 -d:pserver:anonymous@squidkerbauth.cvs.sourceforge.net:/cvsroot/squidkerbauth co -P squid_kerb_ldap
$ cd squid_kerb_ldap
$ ./configure && make
DNS
Use system-config-network to configure le DNS point to le domain controller, définissez le hostname to centos.dom.local.
Reboot
Check reverse DNS is working:
$ dig -x 172.17.3.10
Vous devriez get centos.dom.local in le answer section. If you ne there is no point continuing. Kerberos authentication will pas work sans DNS configured properly.
Kerberos
Your krb.conf should look like something like this:
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
default_realm = DOM.LOCAL
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
# For Windows XP:
default_tgs_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
default_tkt_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
permitted_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
# For Windows 2007:
# default_tgs_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
# default_tkt_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
# permitted_enctypes = aes256-cts-hmac-sha1-96 rc4-hmac des-cbc-crc des-cbc-md5
forwardable = yes
[realms]
DOM.LOCAL = {
kdc = 172.17.3.11:88
admin_server = 172.17.3.11:7491
default_domain = dom.local
}
[domain_realm]
.dom.local = DOM.LOCAL
dom.local = DOM.LOCAL
[appdefaults]
pam = {
debug = false
ticket_lifetime = 36000
renew_lifetime = 36000
forwardable = true
krb4_convert = false
}
Create keytab:
$ kinit administrator
$ msktutil -c -b "CN=COMPUTERS" -s HTTP/centos.dom.local -h centos.dom.local -k /etc/HTTP.keytab --computer-name centos-http --upn HTTP/centos.dom.local --server server.dom.local --verbose
For Windows 2008 you need to add --enctypes 28 to le msktutil command.
Squid
Install squid:
$ wget http://www.squid-cache.org/Versions/v3/3.0/squid-3.0.STABLE18.tar.gz
$ tar zxvf squid-3.0.STABLE18.tar.gz
$ cd squid-3.0.STABLE18
$ ./configure --enable-negotiate-auth-helpers=squid_kerb_auth --enable-stacktraces --prefix=/opt/squid-3.0
$ make
$ make install
$ cp helpers/negotiate_auth/squid_kerb_auth/squid_kerb_auth /opt/squid-3.0/sbin/
$ cp ~/squid_kerb_ldap/squid_kerb_ldap /opt/squid-3.0/sbin/
$ cd /opt/squid-3.0/
$ mv etc/squid.conf etc/squid.conf.ORIG
Setup le approprié parameters in squid.conf:
auth_param negotiate program /opt/squid-3.0/sbin/squid_kerb_auth -d -s HTTP/centos.dom.local
auth_param negotiate children 10
auth_param negotiate keep_alive o
external_acl_type SQUID_KERB_LDAP ttl=3600 negative_ttl=3600 %LOGIN /opt/squid-3.0/sbin/squid_kerb_ldap -d -g SQUID_USERS
acl AUTHENTICATED proxy_auth REQUIRED
acl LDAP_GROUP_CHECK external SQUID_KERB_LDAP
acl localnet src 172.17.3.0/24 # RFC1918 possible internal network
#http_access allow localnet
#http_access allow AUTHENTICATED
http_access allow LDAP_GROUP_CHECK
cache_dir ufs /var/cache/squid-3.0 100 16 256
access_log /var/log/squid-3.0/access.log squid
cache_log /var/log/squid-3.0/cache.log
cache_store_log /var/log/squid-3.0/store.log
pid_filename /var/run/squid-3.0.pid
cache_effective_user squid
cache_effective_group squid
coredump_dir /var/cache/squid-3.0
Setup le user et directories:
$ chown -R squid:squid /opt/squid-3.0/
$ mkdir /var/cache/squid-3.0
$ chown -R squid:squid /var/cache/
$ mkdir /var/log/squid-3.0
$ chown -R squid:squid /var/log/squid-3.0/
$ chown squid:squid /etc/HTTP.keytab
Create caches:
$ /opt/squid-3.0/sbin/squid -z
Init script
Now this is important: Squid needs certains environment variables setup to run properly. The best way to do this is to use an init script. Voici a slightly edited CentOS one:
#!/bin/bash
# squid This shell script takes care of starting and stopping
# Squid Internet Object Cache
#
# chkconfig: - 90 25
# description: Squid - Internet Object Cache. Internet object caching is \
# a way to store requested Internet objects (i.e., data available \
# via the HTTP, FTP, and gopher protocols) on a system closer to the \
# requesting site than to the source. Web browsers can then use the \
# local Squid cache as a proxy HTTP server, reducing access time as \
# well as bandwidth consumption.
# pidfile: /var/run/squid-3.0.pid
# config: /opt/squid-3.0/etc/squid.conf
PATH=/usr/bin:/sbin:/bin:/usr/sbin
export PATH
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# don't raise an error if the config file is incomplete
# set defaults instead:
SQUID_OPTS=${SQUID_OPTS:-"-D"}
SQUID_PIDFILE_TIMEOUT=${SQUID_PIDFILE_TIMEOUT:-20}
SQUID_SHUTDOWN_TIMEOUT=${SQUID_SHUTDOWN_TIMEOUT:-100}
KRB5_KTNAME=/etc/HTTP.keytab
export KRB5_KTNAME
# determine the name of the squid binary
[ -f /opt/squid-3.0/sbin/squid ] && SQUID=/opt/squid-3.0/sbin/squid
prog="$SQUID"
# determine which one is the cache_swap directory
CACHE_SWAP=`sed -e 's/#.*//g' /opt/squid-3.0/etc/squid.conf | \
grep cache_dir | awk '{ print $3 }'`
[ -z "$CACHE_SWAP" ] && CACHE_SWAP=/var/spool/squid-3.0
RETVAL=0
start() {
#check if the squid conf file is present
if [ ! -f /opt/squid-3.0/etc/squid.conf ]; then
echo "Configuration file /opt/squid-3.0/etc/squid.conf missing" 1>&2
exit 6
fi
. /etc/sysconfig/squid
# don't raise an error if the config file is incomplete.
# set defaults instead:
SQUID_OPTS=${SQUID_OPTS:-"-D"}
SQUID_PIDFILE_TIMEOUT=${SQUID_PIDFILE_TIMEOUT:-20}
SQUID_SHUTDOWN_TIMEOUT=${SQUID_SHUTDOWN_TIMEOUT:-100}
if [ -z "$SQUID" ]; then
echo "Insufficient privilege" 1>&2
exit 4
fi
for adir in $CACHE_SWAP; do
if [ ! -d $adir/00 ]; then
echo -n "init_cache_dir $adir... "
$SQUID -z -F -D >> /var/log/squid-3.0/squid.out 2>&1
fi
done
echo -n $"Starting $prog: "
$SQUID $SQUID_OPTS >> /var/log/squid-3.0/squid.out 2>&1
RETVAL=$?
if [ $RETVAL -eq 0 ]; then
timeout=0;
while : ; do
[ ! -f /var/run/squid-3.0.pid ] || break
if [ $timeout -ge $SQUID_PIDFILE_TIMEOUT ]; then
RETVAL=1
break
fi
sleep 1 && echo -n "."
timeout=$((timeout+1))
done
fi
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/squid-3.0
[ $RETVAL -eq 0 ] && echo_success
[ $RETVAL -ne 0 ] && echo_failure
echo
return $RETVAL
}
stop() {
. /etc/sysconfig/squid
# don't raise an error if the config file is incomplete.
# set defaults instead:
SQUID_SHUTDOWN_TIMEOUT=${SQUID_SHUTDOWN_TIMEOUT:-100}
echo -n $"Stopping $prog: "
$SQUID -k check >> /var/log/squid-3.0/squid.out 2>&1
RETVAL=$?
if [ $RETVAL -eq 0 ] ; then
$SQUID -k shutdown &
rm -f /var/lock/subsys/squid-3.0
timeout=0
while : ; do
[ -f /var/run/squid-3.0.pid ] || break
if [ $timeout -ge $SQUID_SHUTDOWN_TIMEOUT ]; then
echo
return 1
fi
sleep 2 && echo -n "."
timeout=$((timeout+2))
done
echo_success
echo
else
echo_failure
echo
fi
return $RETVAL
}
reload() {
. /etc/sysconfig/squid
# don't raise an error if the config file is incomplete.
# set defaults instead:
SQUID_OPTS=${SQUID_OPTS:-"-D"}
$SQUID $SQUID_OPTS -k reconfigure
}
restart() {
stop
start
}
condrestart() {
[ -e /var/lock/subsys/squid-3.0 ] && restart || :
}
rhstatus() {
status $SQUID && $SQUID -k check
}
probe() {
return 0
}
case "$1" in
start)
start
;;
stop)
stop
;;
reload)
reload
;;
restart)
restart
;;
condrestart)
condrestart
;;
status)
rhstatus
;;
probe)
exit 0
;;
*)
echo $"Usage: $0 {start|stop|status|reload|restart|condrestart}"
exit 2
esac
exit $?
These are le important lines:
KRB5_KTNAME=/etc/HTTP.keytab
export KRB5_KTNAME
Client Machine
Set votre proxy to server centos.dom.local using port 3128. C'est important that you use le fully qualified domain name et NOT le IP address.
