Hi,
When using the latest squid 4 release you can use %note{group} to get
the group information from the Negotiate Kerberos helper to transfer the PAC
group SIDs to the external ACL helper.
squid.conf
...
external_acl_type test_acl ipv4 %LOGIN %note{group}
/opt/squid-trunk/sbin/test_acl
acl squid_allow external test_acl
...
The helper script will initially look for the objectsid of the group
SQUID_ALLOW (i.e. it will be only called when the helper is started and
never again - good for performance). After that the SIDs from the Kerberos
PAC information is compared with the previously retrieved SID from AD.
#!/bin/bash
#
# GET SID for Group
#
export KRB5CCNAME=/tmp/squid_krb5cc
kinit -kt /etc/squid/squid.keytab HTTP/opensuse42.suse.home
SID=`ldapsearch -LLL -Ygssapi -H ldap://dc1.samba.home:389 -s sub -b
"DC=samba,DC=home" "(CN=SQUID_ALLOW)" objectsid 2>&1 | awk '{ if ( $0
~/^object/ ) print $2}'`
(>&2 echo "`date +"%Y/%m/%d %H:%M:%S"`| test_ACL: SID=$SID")
#
# Loop over input
#
while [ 1 == 1 ] ; do
read input
found=0
user=`echo $input | awk '{ print $1 }'`
groups=`echo $input | awk '{ print $2 }'`
(>&2 echo "`date +"%Y/%m/%d %H:%M:%S"`| test_ACL: user=$user")
(>&2 echo "`date +"%Y/%m/%d %H:%M:%S"`| test_ACL: groups=$groups")
if [ -n "$groups" ]; then
while read group; do
if [ "$group" == "$SID" ]; then
(>&2 echo "`date +"%Y/%m/%d %H:%M:%S"`| test_ACL: matched group:
$group")
found=1
echo "OK"
fi
done <<< "$(echo $groups | tr , "\n" )"
if [ $found -eq 0 ]; then
echo "ERR"
fi
else
if [ $found -eq 0 ]; then
echo "ERR"
fi
fi
done
Example log from the cache.log file
2017/08/08 20:02:02 kid1| helperOpenServers: Starting 0/5 'test_acl'
processes
2017/08/08 20:02:02 kid1| helperOpenServers: No 'test_acl' processes needed.
2017/08/08 20:02:23 kid1| Starting new test_acl helpers...
2017/08/08 20:02:23 kid1| helperOpenServers: Starting 1/5 'test_acl'
processes
2017/08/08 20:02:24| test_ACL: SID=AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVUwQAAA==
2017/08/08 20:02:24| test_ACL: user=Administrator@xxxxxxxxxx
2017/08/08 20:02:24| test_ACL:
groups=AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVCAIAAA==,AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVPAIAAA==,AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVBwIAAA==,AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVBgIAAA==,AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVAAIAAA==,AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVUwQAAA==
2017/08/08 20:02:24| test_ACL: matched group:
AQUAAAAAAAUVAAAAjxbSIudxUpznEbHVUwQAAA==
Regards
Markus
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