Squid with authentication on Centos 6
How to install Squid with authentication on Centos 6
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[NOTE: According to our AUP/TOS you can use only private proxy servers with authentication.]
There are several authentication helpers, squid can work with. In this guide we will set up ncsa_auth helper.
Install squid if you haven't it installed yet:
yum install squid
If there is any problem with installing squid - install EPEL repo:
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm sudo rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
Enable the remi repository by opening file /etc/yum.repos.d/remi.repo and set enabled=1
name=Les RPM de remi pour Enterprise Linux $releasever - $basearch #baseurl=http://rpms.famillecollet.com/enterprise/$releasever/remi/$basearch/ mirrorlist=http://rpms.famillecollet.com/enterprise/$releasever/remi/mirror enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-remi failovermethod=priority
Now when EPEL is installed you can install squid as shown above.
Before setting up the authentication, test basic squid functionality. It has to work without requiring authorization.
Create user:
htpasswd -c /etc/squid/passwd user1
This command creates file passwd. In this file will be stored NCSA users and passwords.
Output:
New password: Re-type new password: Adding password for user user1
If htpasswd command is not recognized, make sure you have httpd installed:
yum install httpd
Make sure squid can read /etc/squid/passwd:
chmod o+r /etc/squid/passwd
Locate nsca_auth authentication helper
rpm -ql squid | grep ncsa_auth
Open /etc/squid/squid.conf file.
Add or edit the strings:
auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/passwd auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours auth_param basic casesensitive off
Add or edit these strings to acl section:
acl ncsa_users proxy_auth REQUIRED http_access allow ncsa_users
Remember that position of strings in file is critical.
Here is a tested config file:
# # Recommended minimum configuration: # 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 auth_param basic program /usr/lib64/squid/ncsa_auth /etc/squid/passwd auth_param basic children 5 auth_param basic realm Squid proxy-caching web server auth_param basic credentialsttl 2 hours auth_param basic casesensitive off # Example rule allowing access from your local networks. # Adapt to list your (internal) IP networks from where browsing # should be allowed 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 Safe_ports port 8899 acl ncsa_users proxy_auth REQUIRED 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 localnet http_access allow localhost http_access allow ncsa_users # And finally deny all other access to this proxy http_access deny all # Squid normally listens to port 3128 http_port 8899 # We recommend you to use at least the following line. hierarchy_stoplist cgi-bin ? # Uncomment and adjust the following to add a disk cache directory. #cache_dir ufs /var/spool/squid 100 16 256 # Leave coredumps in the first cache dir coredump_dir /var/spool/squid # Add any of your own refresh_pattern entries above these. 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 httpd_suppress_version_string on forwarded_for off visible_hostname squid.101
NOTE: the port is changed to 8899 from standard 3128
You can disable IPv6 by adding line
tcp_outgoing_address 0.0.0.0 all
Restart squid
/etc/init.d/squid restart
For allow squid start automatically during system startup :
chkconfig squid on
Also remember to check iptables if you cant connect/telnet squid port. For troubleshooting try to temporary disable iptables.
Here is example iptables rules:
iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d <serverIP> --dport <squidport> -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp -s <serverip> --sport <squidport> -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT
NOTE: since Squid 3.1.0 you may receive an error TCP_MISS/503 in /var/log/squid/access.log. If so, add the string tcp_outgoing_address <your public IP or domain name> in /etc/squid/squid.conf
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