Amos, And this issue is kind of big\mega corp services or CDN services. Now I am really not sure I understand what this security host forgery is about. There are couple cases: - Simple forward proxy with ssl-bump which no header forgery should ever happen when the client requests for a specific domain and no IP - Intercept proxy with ssl-bump enabled that has no SNI host - Intercept proxy with ssl-bump enabled that has SNI and squid passes the clients SNI host Which one of the above is this specific case? And if there are other cases it's good to list them and I will try to wiki these details. Thanks, Eliezer ---- Eliezer Croitoru Linux System Administrator Mobile: +972-5-28704261 Email: eliezer@xxxxxxxxxxxx -----Original Message----- From: squid-users <squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Amos Jeffries Sent: Tuesday, May 15, 2018 21:28 To: squid-users@xxxxxxxxxxxxxxxxxxxxx Subject: Re: SOLVED - SECURITY ALERT: Host header forgery detected On 16/05/18 02:02, Eliezer Croitoru wrote: > Hey Martin, > > Technically there should be a way to inform Squid-Cache about multiple addresses for the same destination. > If Squid doesn't know that it's a real IP of the domains a partial solution is to use the same DNS service but it can also be something else. > For example there should be a way\option for squid to decide if this address of the client or server is secured. > > Amos what do you think? > Can a Host header forgery detection override acl be added? Should it be added? > I believe that if there are some properties to the remote certificate we can flag the service as "Secure" > IE if the OS runs a "openssl s_client -host www.ubuntnu.com -connect 91.189.89.118:443 > And the certificate is fine then... it's there is no place for any SECURITY ALERT. A malicious actor would simply forward the TLS handshake to the real server they are spoofing. Same way Squid does for SSL-Bump. The counter argument of not sending SNI to that suspicious server will have failures with these exact same mega-corp services. Think foo.example.com hosted on Google hosting where the generic server cert is "foo.1e1.net" not "foo.example.com", nor even google.com". The "problem" that needs to be resolved is simply that the genuine servers do not have a reliable match between their IP and client presented domain name(s). Amos _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users _______________________________________________ squid-users mailing list squid-users@xxxxxxxxxxxxxxxxxxxxx http://lists.squid-cache.org/listinfo/squid-users
