<font size=2 face="sans-serif">HI All;</font>
<br>
<br><font size=2 face="sans-serif">Squid integration with AD kerberos auth
was working properly for me. Today faced issue, as users are getting login
prompt while accessing Proxy. </font>
<br><font size=2 face="sans-serif">Not sure what went wrong. here is my
configuration and also cache.log o/p. Need urgent help.</font>
<br>
<br><font size=2 face="sans-serif">==============================================================</font>
<br><font size=2 face="sans-serif">#</font>
<br><font size=2 face="sans-serif"># Recommended minimum configuration:</font>
<br><font size=2 face="sans-serif">#### AD SSO Integration #####</font>
<br><font size=2 face="sans-serif">auth_param negotiate program /usr/lib64/squid/squid_kerb_auth
-s HTTP/proxy02.ABCD.gov.eu@ABCD.GOV.EU -d</font>
<br><font size=2 face="sans-serif">auth_param negotiate children 10</font>
<br><font size=2 face="sans-serif">auth_param negotiate keep_alive on</font>
<br><font size=2 face="sans-serif">#auth_param basic credentialsttl 2 hours</font>
<br><font size=2 face="sans-serif">acl ad_auth proxy_auth REQUIRED</font>
<br>
<br><font size=2 face="sans-serif">#### AD Group membership ####</font>
<br>
<br><font size=2 face="sans-serif">external_acl_type AD_Group ttl=300 negative_ttl=0
%LOGIN /usr/lib64/squid/squid_ldap_group -P -R -b "DC=ABCD,DC=GOV,DC=EU"
-D svcproxy -W /etc/squid/pswd/pswd -f "(&(objectclass=person)(userPrincipalName=%v)(memberof=cn=%a,ou=InternetAccess,ou=Groups,dc=ABCD,dc=GOV,dc=EU))"
-h ABCD.GOV.EU -s sub -v 3 -d</font>
<br>
<br><font size=2 face="sans-serif">acl AVWSUS external AD_Group lgOnlineUpdate</font>
<br><font size=2 face="sans-serif">acl windowsupdate dstdomain "/etc/squid/sitelist/infra_update_site"</font>
<br>
<br><font size=2 face="sans-serif">acl manager proto cache_object</font>
<br><font size=2 face="sans-serif">acl localhost src 127.0.0.1/32 ::1</font>
<br><font size=2 face="sans-serif">acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
::1</font>
<br>
<br><font size=2 face="sans-serif"># Example rule allowing access from
your local networks.</font>
<br><font size=2 face="sans-serif"># Adapt to list your (internal) IP networks
from where browsing</font>
<br><font size=2 face="sans-serif"># should be allowed</font>
<br><font size=2 face="sans-serif">acl AVSRVR src xx.xx.8.123
# Cloud SEPM Server</font>
<br><font size=2 face="sans-serif">acl localnet src 10.0.0.0/8
# RFC1918 possible internal network</font>
<br><font size=2 face="sans-serif">acl localnet src 172.16.0.0/12
# RFC1918 possible internal network</font>
<br><font size=2 face="sans-serif">acl localnet src 192.168.0.0/16
# RFC1918 possible internal network</font>
<br><font size=2 face="sans-serif">acl localnet src fc00::/7
# RFC 4193 local private network range</font>
<br><font size=2 face="sans-serif">acl localnet src fe80::/10
# RFC 4291 link-local (directly plugged) machines</font>
<br><font size=2 face="sans-serif">#</font>
<br><font size=2 face="sans-serif">acl SSL_ports port 443</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 80
# http</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 21
# ftp</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 443
# https</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 70
# gopher</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 210
# wais</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 1025-65535
# unregistered ports</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 280
# http-mgmt</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 488
# gss-http</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 591
# filemaker</font>
<br><font size=2 face="sans-serif">acl Safe_ports port 777
# multiling http</font>
<br><font size=2 face="sans-serif">acl CONNECT method CONNECT</font>
<br>
<br><font size=2 face="sans-serif"># Recommended minimum Access Permission
configuration:</font>
<br><font size=2 face="sans-serif">#</font>
<br><font size=2 face="sans-serif"># Only allow cachemgr access from localhost</font>
<br><font size=2 face="sans-serif">http_access allow manager localhost</font>
<br><font size=2 face="sans-serif">http_access deny manager</font>
<br>
<br><font size=2 face="sans-serif"># Deny requests to certain unsafe ports</font>
<br><font size=2 face="sans-serif">http_access deny !Safe_ports</font>
<br>
<br><font size=2 face="sans-serif"># Deny CONNECT to other than secure
SSL ports</font>
<br><font size=2 face="sans-serif">http_access deny CONNECT !SSL_ports</font>
<br>
<br><font size=2 face="sans-serif"># We strongly recommend the following
be uncommitted to protect innocent</font>
<br><font size=2 face="sans-serif"># web applications running on the proxy
server who think the only</font>
<br><font size=2 face="sans-serif"># one who can access services on "localhost"
is a local user</font>
<br><font size=2 face="sans-serif">#http_access deny to_localhost</font>
<br>
<br><font size=2 face="sans-serif"># INSERT YOUR OWN RULE(S) HERE TO ALLOW
ACCESS FROM YOUR CLIENTS</font>
<br><font size=2 face="sans-serif">#</font>
<br><font size=2 face="sans-serif"># Example rule allowing access from
your local networks.</font>
<br><font size=2 face="sans-serif"># Adapt localnet in the ACL section
to list your (internal) IP networks</font>
<br><font size=2 face="sans-serif"># from where browsing should be allowed</font>
<br>
<br><font size=2 face="sans-serif">http_access allow AVSRVR windowsupdate</font>
<br><font size=2 face="sans-serif">http_access allow AVWSUS windowsupdate</font>
<br><font size=2 face="sans-serif">http_access deny all</font>
<br><font size=2 face="sans-serif">http_access allow ad_auth</font>
<br>
<br><font size=2 face="sans-serif"># And finally deny all other access
to this proxy</font>
<br><font size=2 face="sans-serif">http_access deny all</font>
<br>
<br><font size=2 face="sans-serif"># Squid normally listens to port 3128</font>
<br><font size=2 face="sans-serif">http_port 8080</font>
<br><font size=2 face="sans-serif">never_direct allow all</font>
<br>
<br><font size=2 face="sans-serif">cache_peer x.x.2.108 parent 8080 0 default</font>
<br>
<br><font size=2 face="sans-serif">dns_nameservers x.x.2.108</font>
<br>
<br><font size=2 face="sans-serif"># We recommend you to use at least the
following line.</font>
<br><font size=2 face="sans-serif">#hierarchy_stoplist cgi-bin ?</font>
<br>
<br><font size=2 face="sans-serif"># Uncomment and adjust the following
to add a disk cache directory.</font>
<br><font size=2 face="sans-serif">cache_dir ufs /var/spool/squid 2048
16 256</font>
<br>
<br><font size=2 face="sans-serif"># Leave coredumps in the first cache
dir</font>
<br><font size=2 face="sans-serif">coredump_dir /var/spool/squid</font>
<br>
<br><font size=2 face="sans-serif"># Log forwarding to SysLog</font>
<br><font size=2 face="sans-serif">access_log syslog:local1.info squid</font>
<br>
<br><font size=2 face="sans-serif"># Add any of your own refresh_pattern
entries above these.</font>
<br><font size=2 face="sans-serif">refresh_pattern ^ftp:
1440
20% 10080</font>
<br><font size=2 face="sans-serif">refresh_pattern ^gopher:
1440 0%
1440</font>
<br><font size=2 face="sans-serif">refresh_pattern -i (/cgi-bin/|\?) 0
0% 0</font>
<br><font size=2 face="sans-serif">refresh_pattern .
0
20% 4320</font>
<br><font size=2 face="sans-serif">==================================================</font>
<br><font size=2 color=#001fe2 face="sans-serif"><b>Cache.log-</b></font>
<br><font size=2 face="sans-serif">====================================</font>
<br><font size=2 face="sans-serif">2016/07/21 14:52:53| squid_kerb_auth:
ERROR: gss_accept_sec_context() failed: Unspecified GSS failure. Minor
code may provide more information.</font>
<br><font size=2 face="sans-serif">2016/07/21 14:52:53| authenticateNegotiateHandleReply:
Error validating user via Negotiate. Error returned 'BH gss_accept_sec_context()
failed: Unspecified GSS failure. Minor code may provide more information.
'</font>
<br><font size=2 face="sans-serif">===================================</font>
<br>
<br><font size=2 color=#4141ff face="sans-serif"><b>Also observed Squid_ldap_group
helper throwing ERR when checking user group membership. but user is part
of the said group in AD.</b></font>
<br>
<br><font size=2 face="sans-serif">========================================================================</font>
<br><font size=2 face="sans-serif"> #/usr/lib64/squid/squid_ldap_group
-P -R -b "DC=ABCD,DC=GOV,DC=EU" -D svcproxy -W /etc/squid/pswd/pswd
-f "(&(objectclass=person)(userPrincipalName=%v)(memberof=cn=%a,ou=InternetAccess,ou=Groups,dc=ABCD,dc=GOV,dc=EU))"
-h ABCD.GOV.EU -s sub -v 3 -d</font>
<br><font size=2 face="sans-serif">853438 lgOnlineUpdate</font>
<br><font size=2 face="sans-serif">Connected OK</font>
<br><font size=2 face="sans-serif">group filter '(&(objectclass=person)(userPrincipalName=853438)(memberof=cn=lgOnlineUpdate,ou=InternetAccess,ou=Groups,dc=ABCD,dc=GOV,dc=EU))',
searchbase 'DC=ABCD,DC=GOV,DC=EU'</font>
<br><font size=2 face="sans-serif">ERR</font>
<br><font size=2 face="sans-serif">==========================================</font>
<br>
<br>
<br>
<br>
<br><font size=2 face="sans-serif">Thanks & Regards<br>
Nilesh Suresh Gavali<br>
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