On Sun, Apr 3, 2016 at 9:59 PM, Amos Jeffries <squ...@treenet.co.nz> wrote:
> On 4/04/2016 4:18 p.m., Jok Thuau wrote: > > I'm attempting to build a transparent proxy (policy based routing on > > firewall to squid proxy) with the following behavior: > > > > 1) proxies http traffic for a given set of domains, provide an message > > otherwise such "domain not allowed" or similar > > 2) proxies https traffic for a given set of domains (ideally, splicing > > those, so as not to break HSTS, if enabled), otherwise provide an error > > message (bumping and providing "domain not allowed") > > > > I'm attempting this with a 3.5.15 compiled with icap (not yet used) and > > ssl-bumping. > > > > Part 1 seems easy enough (and is well documented)... > > > > acl whitelist dstdomain .domain1.tld > > acl whitelist dstdomain .domain2.tld > > > > acl http_ok all-of whitelist !SSL_ports > > > > http_access allow http_ok > > http_access deny all > > This is denying the HTTPS traffic CONNECT requests (synthesized by > Squid), since they only have IP address no domain name. > yes, this is where I started with just http. > > > > > > Moving onto Part 2 (the peek and splice setup) appears to be the topic > of a > > few discussions out there... > > > > acl sni_whitelist ssl::server_name .domain1.tld > > acl sni_whitelist ssl::server_name .domain2.tld > > > > ssl_bump peek step1 > > You have omitted the definition of step1 ACL. > > the definition of "step1" is the same as the one on the wiki (See full config below) > > ssl_bump splice sni_whitelist > > ssl_bump bump all > > > > It appears however that when combining the two, the generated > > certificate(s), instead of mimic'ing the original server's certificate > > comes out with the CN=<IP> where <IP> is the ip used by the "connect" > part > > of the connection. In addition, it appears that only the first entry ever > > matches (at this point, i've tried so many combinations, i'm no longer > > certain of anything). > > You have omitted the http(s)_port configuration details, and the step1 > ACL. So its not possible to say if you have the cert generation settings > wrong, or if the peeking step is matching wrong, or something else. > > That's included in the config below. > > > > If i remove *all* the http_access lines, then the behavior appears > correct > > (from a "splicing/bumping" standpoint). > > > > Strange. Squid without any http_access lines should be denying traffic > 100%. > > I do not see this behavior. Traffic appears to be allowed, and bumped (though with the wrong certificate, depending on the config, as explained before). > > Can anyone confirm that this is indeed possible to achieve? > > > > I believe, based on experimentation that any http_access i have, because > of > > the "deny all" cause the bumping to "short circuit" and effectively send > an > > early "access denied" based on the only information it has (the ip > address > > from the "connect", rather than the SNI that would come later). > > > > Would a setup where "deny http+!whitelist" so have the allow be the > default > > allow for the bumping to work and get to step2 and match the sni* acls > > somehow? (with a "deny step2 !sni_whitelist"). > > > > Is 3.5.15 capable of doing this? If this requires some feature/effort, > what > > would be the procedure to sponsor that work? > > It is not possible to answer any of those questsions properly without > full config details. You have omitted a lot. > my apologies for trying to show only the relevant parts. Find below the current config. It appears to be bumping everything rather than splicing any of the config (which may be due to the limitations documented on the wiki) acl Safe_ports port 80 # http acl Safe_ports port 443 # https acl SSL_ports port 443 acl CONNECT method CONNECT http_port 3129 intercept https_port 8443 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=64MB \ cert=/etc/squid/ssl/proxy.pem \ key=/etc/squid/ssl/proxy.key \ cafile=/etc/squid/ssl/proxy.pem always_direct allow all acl step1 at_step SslBump1 acl step2 at_step SslBump2 acl step3 at_step SslBump3 acl SniBypass ssl::server_name_regex \.slashdot\.org acl SniBypass ssl::server_name_regex \.fsdn\.com acl http_bypass dstdomain .slashdot.org acl http_bypass dstdomain .fsdn.com acl https_bypass all-of CONNECT SniBypass acl http_ok all-of http_bypass Safe_ports ssl_bump peek step1 ssl_bump splice SniBypass step2 ssl_bump bump all sslproxy_cert_sign_hash sha256 sslproxy_options NO_SSLv2,NO_SSLv3,SINGLE_ECDH_USE always_direct allow all sslcrtd_program /usr/lib/squid/ssl_crtd -s /var/lib/ssl_db -M 4MB sslcrtd_children 8 startup=1 idle=1 http_access allow http_ok http_access allow CONNECT no_cache allow all cache deny all shutdown_lifetime 3 seconds
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