[CentOS] Squid as interception HTTPS proxy under CentOS 7

Tris Hoar trishoar at bgfl.org
Thu Feb 4 17:36:40 UTC 2016


On 04/02/2016 13:24, C. L. Martinez wrote:
> Hi all,
>
>   I am trying to configure squid as a interception HTTPS proxy under CentOS 7. At every https request, I am receiving a certificate error.
>
>   My current config for squid is:
>
> # My localnet
> acl localnet src 172.22.55.0/28
> acl localnet src 172.22.58.0/29
>
> 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
>
> #
> # Recommended minimum Access Permission configuration:
> #
> # 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
>
> # Only allow cachemgr access from localhost
> http_access allow localhost manager
> http_access deny manager
>
> # 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
>
> # And finally deny all other access to this proxy
> http_access deny all
>
> # Squid normally listens to port 3128
> #http_port 3128
>
> # 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
>
> # My custom configuration
> http_port 8079
> http_port 8080 intercept
> https_port 8081 ssl-bump intercept generate-host-certificates=on dynamic_cert_mem_cache_size=4MB key=/etc/squid/custom.private cert=/etc/squid/custom.cert
>
> # Anonymous proxy
> forwarded_for off
> request_header_access Allow allow all
> request_header_access Authorization allow all
> request_header_access WWW-Authenticate allow all
> request_header_access Proxy-Authorization allow all
> request_header_access Proxy-Authenticate allow all
> request_header_access Cache-Control allow all
> request_header_access Content-Encoding allow all
> request_header_access Content-Length allow all
> request_header_access Content-Type allow all
> request_header_access Date allow all
> request_header_access Expires allow all
> request_header_access Host allow all
> request_header_access If-Modified-Since allow all
> request_header_access Last-Modified allow all
> request_header_access Location allow all
> request_header_access Pragma allow all
> request_header_access Accept allow all
> request_header_access Accept-Charset allow all
> request_header_access Accept-Encoding allow all
> request_header_access Accept-Language allow all
> request_header_access Content-Language allow all
> request_header_access Mime-Version allow all
> request_header_access Retry-After allow all
> request_header_access Title allow all
> request_header_access Connection allow all
> request_header_access Proxy-Connection allow all
> request_header_access User-Agent allow all
> request_header_access Cookie allow all
> request_header_access All deny all
>
> # SSL Bump Config
> always_direct allow all
> ssl_bump server-first all
> sslproxy_cert_error deny all
> sslproxy_flags DONT_VERIFY_PEER
>
>   I have tried disabling "sslproxy_cert_error" and "sslproxy_flags" directives, without luck.
>
>   Any ideas about what am I doing wrong?
>
>   Thanks.
>

Do you have a copy of the Root CA you are using to re-encrypt the SSL 
stream installed in the browser?

Tris


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