Configuring Squid for SSL can be a complex process, but it can provide a number of benefits for your network, including improved security and faster web browsing. Here is a step-by-step guide to configuring Squid for SSL:
Install Squid on your server. This can typically be done using the package manager of your Linux distribution.
Generate a private key and self-signed certificate for your server. This can be done using OpenSSL. First, generate a private key by running the following command:
1
openssl genrsa -out server.key 2048
Next, generate a self-signed certificate using the private key:
1
openssl req -new -x509 -key server.key -out server.crt -days 365
Configure Squid to use the private key and certificate. Edit the Squid configuration file (/etc/squid/squid.conf) and add the following lines:
1
https_port 443 cert=/path/to/server.crt key=/path/to/server.key
Enable SSL interception in Squid. This can be done by adding the following line to the Squid configuration file:
1
ssl_bump server-first all
Configure client authentication, if desired. If you want to require client authentication when connecting to the Squid proxy, you can configure Squid to use client certificates. To do this, you will need to generate a certificate authority (CA) and issue certificates to your clients. First, generate a private key and self-signed certificate for your CA:
1
2
openssl genrsa -out ca.key 2048
openssl req -new -x509 -key ca.key -out ca.crt -days 365
Next, generate client certificates signed by the CA:
1
2
3
openssl genrsa -out client.key 2048
openssl req -new -key client.key -out client.csr
openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 365
Finally, configure Squid to use the CA certificate and require client authentication:
1
2
3
4
5
acl clientauth_users ssl::client_cert_dn
http_access allow clientauth_users
ssl_bump client-first all
ssl_bump stare all
sslproxy_cert_sign /path/to/ca.crt
Restart Squid to apply the changes. You can do this by running the following command:
1
systemctl restart squid
Test the configuration. To test that Squid is properly configured for SSL, try accessing an HTTPS website through the proxy. If everything is set up correctly, the website should load without any issues. Note: This is just a basic guide to configuring Squid for SSL. There are many additional options and configurations that you can use to fine-tune the behavior of your Squid proxy. For more detailed information, consult the Squid documentation and other resources online.