[squid-users] Squid - AD kerberos auth and Linux Server proxy access not working

[Nilesh Gavali]

All;

we have Squid proxy configured with Windows SSO with Kerberos which work 
fine for WIndows AD users.
we have new requirement where one Linux application server need to access 
Internet via squid proxy, we allowed Linux host access via ACL but getting 
denied access error.
below is the configuration done to allow Linux Server host IWCCP02.

###################################
auth_param negotiate program /usr/lib64/squid/squid_kerb_auth -s 
HTTP/proxy02.cust.in at CUST.IN
auth_param negotiate children 20
auth_param negotiate keep_alive on

acl ad_auth proxy_auth REQUIRED

####  AD Group membership  ####

external_acl_type AD_Group ttl=300 negative_ttl=0 %LOGIN 
/usr/lib64/squid/squid_ldap_group -P -R -b "DC=CUST, DC=IN" -D svcproxy -W 
/etc/squid/pswd/pswd -f 
"(&(objectclass=person)(userPrincipalName=%v)(memberof=cn=%a,ou=InternetAccess,ou=Groups,DC=CUST, 
DC=IN))" -h Cust.in -s sub -v 3
#
#
acl USER external AD_Group lgInternetAccess_Users
acl allowedsite dstdomain "/etc/squid/sitelist/dbs_allowed_site"

acl manager proto cache_object
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1

# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed

acl IWCCP01 src 10.xx.15.103   # Linux Application server
acl localnet src 10.0.0.0/8     # RFC1918 possible internal network
acl localnet src 172.16.0.0/12  # RFC1918 possible internal network
acl localnet src 192.168.0.0/16 # RFC1918 possible internal network
acl localnet src fc00::/7       # RFC 4193 local private network range
acl localnet src fe80::/10      # RFC 4291 link-local (directly plugged) 
machines
#
acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http
acl CONNECT method CONNECT

# Recommended minimum Access Permission configuration:
#
# Only allow cachemgr access from localhost
http_access allow manager localhost
http_access deny manager

# Deny requests to certain unsafe ports
http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports
http_access deny CONNECT !SSL_ports

# We strongly recommend the following be uncommented to protect innocent
# web applications running on the proxy server who think the only
# one who can access services on "localhost" is a local user
#http_access deny to_localhost

# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS
#
# Example rule allowing access from your local networks.
# Adapt localnet in the ACL section to list your (internal) IP networks
# from where browsing should be allowed


http_access allow IWCCP01 allowedsite
http_access allow USER allowedsite
http_access deny all
http_access allow ad_auth

# And finally deny all other access to this proxy
http_access deny all

# Squid normally listens to port 3128
http_port 8080
never_direct allow all

cache_peer 10.xx.xx.108 parent 8080 0 default
#######################################################################


Thanks & Regards
Nilesh Suresh Gavali
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