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  • Squid with authentication on Centos 6

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    How to install Squid with authentication on Centos 6

             >>Get VPS with current config  ready-to-go $5.95 p/m Netherlands, EU<<
    


    [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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