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Squid Password Authentication Using NCSA

You can configure Squid to prompt users for a username and password. Squid comes with a program called ncsa_auth that reads any NCSA-compliant encrypted password file.

1) Create the password file. The name of the password file should be /etc/squid/squid_passwd, and you need to make sure that it’s universally readable.

# touch /etc/squid/squid_passwd
# chmod o+r /etc/squid/squid_passwd

2) Use the htpasswd program to add users to the password file. You can add users at anytime without having to restart Squid. In this case, you add a username called nikesh:

# htpasswd /etc/squid/squid_passwd nikeshNew
password:Re-type new password:
Adding password for user nikesh

3) Find your ncsa_auth file using the locate/find command. (different distro stores this file at different locations)

# locate ncsa_auth/usr/lib/squid/ncsa_auth

4) Edit squid.conf; specifically, you need to define the authentication program in squid.conf, which is in this case ncsa_auth. Next, create an ACL named ncsa_users with the REQUIRED keyword that forces Squid to use the NCSA auth_param method you defined previously. Finally, create an http_access entry that allows traffic that matches the ncsa_users ACL entry. Here’s a simple user authentication example; the order of the statements is important:

## Add this to the auth_param section of squid.conf

auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/squid_passwd

# Add this to the bottom of the ACL section of squid.conf
acl ncsa_users proxy_auth REQUIRED

# Add this at the top of the http_access section of squid.conf
http_access allow ncsa_users

Remember to restart Squid for the changes to take effect.


Anonymous said...

it get password in clear text format, and user get it easy with sanaffirs. Please guide how to encrypt it.

iMarc said...

Thanks Nikesh! Simple, to-the-point and accurate...great post :)

Anonymous said...


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