I have working configuration for SSL bumping on Squid 4.4 and RHEL8. I’m finding though, that a handful of sites that don’t have SSL set up (e.g., http://squidguard.org) are not working.
I’ve had to cobble together my configuration using several different sources since none seem to offer a definitive approach to setting up SSL bumping. It’s possible that I’ve missed something that would allow Squid to handle both HTTP and HTTPS traffic?
This is what I’m seeing in the log:
1624658033.150 59887 10.108.0.18 TCP_MISS/503 4300 GET http://squidguard.com/favicon.ico - HIER_DIRECT/188.8.131.52 text/html 1624658042.966 60608 10.108.0.18 TCP_MISS/503 4392 GET http://squidguard.com/ - HIER_DIRECT/184.108.40.206 text/html
The error on the browser page says
The following error was encountered while trying to retrieve the URL: http://squidguard.com/ Connection to 220.127.116.11 failed. The system returned: (110) Connection timed out The remote host or network may be down. Please try the request again.
The remote host or network isn’t down, though. I can reach it when not going through the proxy.
acl vdi src 10.108.0.0/20 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 CONNECT method CONNECT acl intermediate_fetching transaction_initiator certificate-fetching http_access allow intermediate_fetching http_access deny !Safe_ports http_access allow localhost manager http_access deny manager http_access allow vdi http_access deny all http_port 0.0.0.0:3128 http_port 0.0.0.0:3129 ssl-bump cert=/etc/squid/ssl_cert/myCA.pem generate-host-certificates=on https_port 0.0.0.0:3130 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=20MB cert=/etc/squid/ssl_cert/myCA.pem sslcrtd_program /usr/lib64/squid/security_file_certgen -s /var/lib/squid/ssl_db -M 20MB ssl_bump stare all ssl_bump bump all cache_dir ufs /var/spool/squid 100 16 256 coredump_dir /var/spool/squid 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 shutdown_lifetime 1 second
I don’t have iptables running so I don’t have any REDIRECT rules. I do suspect this to be the problem.