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/3.223.115.185 text/html
1624658042.966 60608 10.108.0.18 TCP_MISS/503 4392 GET http://squidguard.com/ - HIER_DIRECT/3.223.115.185 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 3.223.115.185 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.
My squid.conf:
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.
Best Answer
The issue is moot. The source of the problem was outside the scope of Squid or even the server on which it is running. Port 80 was being blocked at the firewall.