[squid-users] squid 5.1: Kerberos: Unable to switch to basic auth with Edge - IE - Chrome

[L.P.H. van Belle]

in your smb.conf add
    # Added to enforced NTLM 2, must be set on all Samba AD-DC's and the needed members. 
    # This is used in combination with ntlm_auth --allow-mschapv2 
    ntlm auth = mschapv2-and-ntlmv2-only

In squid use: 
auth_param negotiate program /usr/lib/squid/negotiate_wrapper_auth \
    --kerberos /usr/lib/squid/negotiate_kerberos_auth -k /etc/squid/krb5-squid-HTTP.keytab \
    -s HTTP/proxy.fq.dn.tld at MY.REALM.TLD \
    --ntlm /usr/bin/ntlm_auth --allow-mschapv2 --helper-protocol=gss-spnego --domain=ADDOM

 
If you connecting for ldap.. Dont use -h 192.168.90.10 
Uses -H ldaps://host.name.fq.dn 

Also push the root-CA off the domain to pc's with GPO for example 
And in that GPO you can set the parts you need to enable for the users/pcs to make it all work. 

But your close, your almost there.. 

On thing i have not looked at myself yet, ext_kerberos_ldap_group_acl 
https://fossies.org/linux/squid/src/acl/external/kerberos_ldap_group/ext_kerberos_ldap_group_acl.8 
Thats one i'll be using with squid 5.1, im still compiling everyting i need, but then im setting
It up, i'll document it and make and howto of it. 

Greetz, 

Louis



________________________________

	Van: squid-users [mailto:squid-users-bounces at lists.squid-cache.org] Namens David Touzeau
	Verzonden: dinsdag 21 september 2021 1:49
	Aan: squid-users at lists.squid-cache.org
	Onderwerp: [squid-users] squid 5.1: Kerberos: Unable to switch to basic auth with Edge - IE - Chrome
	
	
	Hi all
	
	i have setup Kerberos authentication with Windows 2019 domain using Squid 5.1 ( The Squid version did not fix the issue - Tested 4.x and 5.x)
	In some cases, some computers are not joined to the domain and ween need to allow authenticate on Squid
	
	To allow this,  Basic Authentication is defined in Squid  and we expect that browsers prompt a login to be authenticated and access to Internet
	
	But the behavior is strange.
	
	On a computer outside the windows domain:
	Firefox is be able to be successfully authenticated to squid using basic auth.
	Edge, Chrome and IE still try ujsing NTLM method and are allways rejected with a 407
	
	When edge, chrome and IE try to establish a session, Squid claim 
	
	2021/09/21 01:17:27 kid1| ERROR: Negotiate Authentication validating user. Result: {result=BH, notes={message: received type 1 NTLM token; }}
	
	This let us understanding that these 3 browsers try NTLM instead of a Basic Authentication.
	
	I did not know why these browsers using NTLM as they did not connected to the Windows domain 
	Why squid never get the Basic Authentication credentials. ?
	
	Did i miss something ?
	
	Here it is my configuration.
	
	auth_param negotiate program /lib/squid3/negotiate_kerberos_auth -r -s GSS_C_NO_NAME -k /etc/squid3/PROXY.keytab
	auth_param negotiate children 20 startup=5 idle=1 concurrency=0 queue-size=80 on-persistent-overload=ERR
	auth_param negotiate keep_alive on
	
	auth_param basic program /lib/squid3/basic_ldap_auth -v -R -b "DC=articatech,DC=int" -D "administrator at articatech.int" <mailto:administrator at articatech.int>  -W /etc/squid3/ldappass.txt -f sAMAccountName=%s -v 3 -h 192.168.90.10
	auth_param basic children 3
	auth_param basic realm Active Directory articatech.int
	auth_param basic credentialsttl 7200 seconds
	authenticate_ttl 3600 seconds
	authenticate_ip_ttl 1 seconds
	authenticate_cache_garbage_interval 3600 seconds
	
	acl AUTHENTICATED proxy_auth REQUIRED