I have problems with Kerberos Autenthication in Squid3 on Debian 8 and
Samba4 DC
My Squid version is: 3.4.8
My Kerberos Autenthication doesn't work.
PROCEDURES PERFORMED
INSTALL OF SAMBA4 AND WINBIND OF DEBIAN BACKPORTS
apt-get -t jessie-backports install samba samba-doc winbind
KERBEROS TEST: kinit administra...@empresa.com.br
klist -l
Principal Name Cache name
-------------- ----------
administra...@empresa.com.br FILE:/tmp/krb5cc_0
JOIN IN THE DOMAIN: net ads join -U administrator
net ads testjoin: JOIN OK
kdestroy
KERBEROS TEST:kinit administra...@empresa.com.br
klist -l
Principal Name Cache name
-------------- ----------
administra...@empresa.com.br FILE:/tmp/krb5cc_0
STOP SERVICES
/etc/init.d/winbind stop
/etc/init.d/samba stop
update-rc.d winbind remove
update-rc.d samba remove
export KRB5_KTNAME=FILE:/etc/squid3/HTTP.keytab
INSTALL OF SQUID3: apt-get install squid3
export KRB5_KTNAME=FILE:/etc/squid3/HTTP.keytab
net ads keytab CREATE
net ads keytab ADD HTTP
unset KRB5_KTNAME
chgrp proxy /etc/squid3/HTTP.keytab
chmod g+r /etc/squid3/HTTP.keytab
/etc/init.d/squid3 restart
KRB5_KTNAME=/etc/squid3/HTTP.keytab
export KRB5_KTNAME
KRB5RCACHETYPE=none
export KRB5RCACHETYPE
/etc/init.d/squid3 restart
Below are my configuration files:
1) /etc/krb5.conf
[libdefaults]
default_realm = EMPRESA.COM.BR
dns_lookup_kdc = no
dns_lookup_realm = no
default_keytab_name = /etc/krb5.keytab
[realms]
EMPRESA.COM.BR = {
kdc = dc1.EMPRESA.COM.BR:88
admin_server = dc1.EMPRESA.COM.BR
default_domain = EMPRESA.COM.BR
}
[domain_realm]
.EMPRESA.COM.BR = EMPRESA.COM.BR
EMPRESA.COM.BR = EMPRESA.COM.BR
[logging]
kdc = FILE:/var/log/kdc.log
admin_server = FILE:/var/log/kadmin.log
default = FILE:/var/log/krb5lib.log
2/etc/samba/smb.conf
[global]
netbios name = proxy
workgroup = EMPRESA
security = ads
realm = EMPRESA.COM.BR
encrypt passwords = yes
dedicated keytab file = /etc/krb5.keytab
kerberos method = secrets and keytab
# password server = dc1.empresa.com.br
preferred master = no
idmap config *:backend = tdb
idmap config *:range = 1000-3000
idmap config EMPRESA:backend = ad
idmap config EMPRESA:schema_mode = rfc2307
idmap config EMPRESA:range = 10000-9999999
winbind nss info = rfc2307
winbind trusted domains only = no
winbind use default domain = yes
winbind enum users = yes
winbind enum groups = yes
winbind offline logon = yes
winbind refresh tickets = yes
vfs objects = acl_xattr
map acl inherit = Yes
store dos attributes = Yes
username map = /etc/samba/user.map
3) /etc/squid3/squid.conf
### Configuracoes Basicas
http_port 3128
#debug_options ALL,111,2 29,9 84,6
cache_mem 512 MB
cache_swap_low 80
cache_swap_high 90
maximum_object_size 512 MB
minimum_object_size 0 KB
maximum_object_size_in_memory 4096 KB
cache_replacement_policy heap LFUDA
memory_replacement_policy heap LFUDA
#Para não bloquear downloads
quick_abort_min -1 KB
#Resolve um problema com conexoes persistentes
detect_broken_pconn on
fqdncache_size 1024
### Parametros de atualizacao da memoria cache
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
refresh_pattern . 0 20% 4320
### Localizacao dos logs
access_log /var/log/squid3/access.log
cache_log /var/log/squid3/cache.log
### define a localizacao do cache de disco, tamanho, qtd de diretorios pai
e subdiretorios
cache_dir aufs /var/spool/squid3 600 16 256
#auth_param negotiate program /usr/lib/squid3/negotiate_kerberos_auth
auth_param negotiate children 10
auth_param negotiate keep_alive on
visible_hostname proxy.empresa.com.br
### acls
#acl manager proto cache_object
acl localhost src 192.168.200.7/32
acl to_localhost dst 192.168.200.7/32
acl SSL_ports port 22 443 563 7071 10000 # ssh, https, snews, zimbra, webmin
acl Safe_ports port 21 # ftp
acl Safe_ports port 70 # gopher
acl Safe_ports port 80 # http
acl Safe_ports port 88 # kerberos
acl Safe_ports port 210 # wais
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 389 # ldap
acl Safe_ports port 443 # https
acl Safe_ports port 488 # gss-http
acl Safe_ports port 563 # snews
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 3001 # imprenssa nacional
acl Safe_ports port 8080 # http
acl Safe_ports port 1025-65535 # unregistered ports
acl purge method PURGE
acl CONNECT method CONNECT
### Regras iniciais do Squid
http_access allow localhost
http_access allow purge localhost
http_access deny purge
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
### Exige autenticacao
acl autenticados proxy_auth REQUIRED
http_access deny !autenticados
# acl ligada a autenticacao
acl grupo_admins proxy_auth "/etc/squid3/acls/usr-admins"
acl grupo_liberado proxy_auth "/etc/squid3/acls/usr-liberados"
#libera o grupo de administradores
http_access allow grupo_admins
### Bloqueia extensoes de arquivos
acl extensoes_bloqueadas url_regex -i "/etc/squid3/acls/extensoes-proibidas"
### Liberar alguns sites
acl sites_liberados url_regex -i "/etc/squid3/acls/sites-permitidos"
### Bloqueia sites por URL
acl sites_bloqueados url_regex -i "/etc/squid3/acls/sites-proibidos"
#bloqueios basicos
http_access allow sites_liberados
http_access deny extensoes_bloqueadas
http_access deny sites_bloqueados
# Libera acesso ao grupo de chefes e professores
http_access allow grupo_liberado
# Incorpora as regras do SquidGuard
redirect_program /usr/bin/squidGuard
redirect_children 20
redirector_bypass on
#libera o grupo de usuarios comuns apos passar por todos os bloqueios
http_access allow autenticados
### Rede do CMB #####
acl lannet src 192.168.200.0/22
### Nega acesso de quem nao esta na rede local
http_access allow lannet
#negando o acesso para todos que nao estiverem nas regras anteriores
http_access deny all
### Erros em portugues
error_directory /usr/share/squid3/errors/pt-br
#cache_effective_user proxy
coredump_dir /var/spool/squid3
Regards,
Márcio Bacci
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