[squid-users] Kerberos Autenthication doesn't work

Thu Aug 18 14:08:35 UTC 2016

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 administrator at EMPRESA.COM.BR
klist -l
Principal Name                   Cache name
--------------                   ----------
administrator at 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 administrator at EMPRESA.COM.BR
klist -l
Principal Name                   Cache name
--------------                   ----------
administrator at 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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