Thanks very much! So, would my configuration file look like this (btw, I'm using Squid2.6.STABLE1, is that a problem?): http_port XXX.XXX.XXX.XXX:80 defaultsite=www.mysite.com vhost cache_peer 127.0.0.1 parent 80 0 no-query originserver name=server_1 login=PASS acl mydomains dstdomain .mysite.com mysite.com cache_peer_access server_1 allow mydomains cache_peer_access server_1 deny all hierarchy_stoplist cgi-bin ? acl QUERY urlpath_regex cgi-bin \? cache deny QUERY acl apache rep_header Server ^Apache broken_vary_encoding allow apache access_log /var/log/squid/access.log squid debug_options ALL,1 33,2 hosts_file /etc/hosts url_rewrite_host_header off refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews acl purge method PURGE acl port80 port 80 acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports never_direct allow mydomains http_access allow mydomains http_access deny all http_reply_access allow all icp_access allow all visible_hostname www.mysite.com coredump_dir /var/spool/squid --- On Tue, 5/27/08, Amos Jeffries <squid3@xxxxxxxxxxxxx> wrote: > From: Amos Jeffries <squid3@xxxxxxxxxxxxx> > Subject: Re: Squid Proxy Hijacked By Hackers in China > To: badaboom003-asdf@xxxxxxxxx > Cc: squid-users@xxxxxxxxxxxxxxx > Date: Tuesday, May 27, 2008, 5:00 AM > badaboom003-asdf@xxxxxxxxx wrote: > > Hi, > > > > My server was brought down by a group in China who > were able to use my squid proxy to send and receive > requests from their IPs. There were over 370 IPs hitting my > server. I'm wondering where I went wrong and what I need > to fix to prevent this in the future? Below are a snippet > from my cache.log and my squid.conf file with IP > obfuscated. One thing I noticed was that they connected > through port 443, which I have in my Safe_Ports list. > Should I remove all of those ports from my safe list? > > > > Any help would be greatly appreciated. Thanks, > > > > Chris- > > > > > > My cache.log file > > ================= > > 2008/05/27 01:36:21| The request CONNECT > 205.188.153.121:443 is DENIED, because it matched > 'all' > > 2008/05/27 01:36:21| The reply for CONNECT > 205.188.153.121:443 is ALLOWED, because it matched > 'all' > > The CONNECT attempt was blocked. What you see there being > 'ALLOWED' is > the denial 404 response going out to whomever tried it. > > > 2008/05/27 01:36:21| The request GET > http://ad.media-servers.net/st?ad_type=pop&ad_s...ed_pop_types=29&pop_times=1&pop_frequency=0$ > > 2008/05/27 01:36:22| The request GET > http://ad.media-servers.net/st?ad_type=pop&ad_s...ed_pop_types=29&pop_times=1&pop_frequency=0$ > > 2008/05/27 01:36:22| The request GET > http://202.86.6.132/config?.redir_from=?&.tries=...ntl=us&.bypass=&.partner=&.chkP=Y&.done=ht$ > > 2008/05/27 01:36:22| The reply for GET > http://ad.media-servers.net/st?ad_type=pop&ad_...size=053&banned_pop_tyimes=1&pop_frequency$ > > 2008/05/27 01:36:22| The request GET > http://www.clickclickclick.com:80/default.asp is ALLOWED, > because it matched 'port80' > > This is the key bit. You blanket accept on port 80. > > > 2008/05/27 01:36:22| The request GET > http://203.209.228.245/isp_verify_user?l=_Dave_M_&p=ty > is ALLOWED, because it matched 'port80' > > 2008/05/27 01:36:22| The request POST > http://fly.emirates.com/IBE/SearchAvailability.aspx is > ALLOWED, because it matched 'port80' > > 2008/05/27 01:36:22| The request GET > http://edit.in.yahoo.com/config/loginpasswd=23131&.save=1 > is ALLOWED, because it matched 'por$ > > 2008/05/27 01:36:22| The request GET > http://fly.emirates.com/ is ALLOWED, because it matched > 'port80' > > 2008/05/27 01:36:22| The reply for GET > http://ad.media-servers.net/st?ad_type=pop&adtion=24_pop_types=29&pop_times=1&pop_frequency$ > > 2008/05/27 01:36:22| The request POST > http://fly.emirates.com/IBE/SearchAvailability.aspx is > ALLOWED, because it matched 'port80' > > 2008/05/27 01:36:22| The request POST > http://mihen.info/Res/CheckProxy.php is ALLOWED, because it > matched 'port80' > > 2008/05/27 01:36:22| The request GET > http://fly.emirates.com/ is ALLOWED, because it matched > 'port80' > > 2008/05/27 01:36:22| storeLateRelease: released 0 > objects > > and on and on... > > > > > > My Squid Config File: > > ===================== > > http_port XXX.XXX.XXX.XXX:80 > defaultsite=www.mysite.com vhost > > cache_peer 127.0.0.1 parent 80 0 no-query originserver > name=server_1 login=PASS > > cache_peer_domain server_1 .mysite.com mysite.com > > hierarchy_stoplist cgi-bin ? > > acl QUERY urlpath_regex cgi-bin \? > > cache deny QUERY > > acl apache rep_header Server ^Apache > > broken_vary_encoding allow apache > > access_log /var/log/squid/access.log squid > > debug_options ALL,1 33,2 > > hosts_file /etc/hosts > > url_rewrite_host_header off > > refresh_pattern ^ftp: 1440 20% 10080 > > refresh_pattern ^gopher: 1440 0% 1440 > > refresh_pattern . 0 20% 4320 > > acl all src 0.0.0.0/0.0.0.0 > > acl manager proto cache_object > > acl localhost src 127.0.0.1/255.255.255.255 > > acl to_localhost dst 127.0.0.0/8 > > acl SSL_ports port 443 563 # https, snews > > acl SSL_ports port 873 # rsync > > acl Safe_ports port 80 # http > > acl Safe_ports port 21 # ftp > > acl Safe_ports port 443 563 # https, snews > > 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 Safe_ports port 631 # cups > > acl Safe_ports port 873 # rsync > > acl Safe_ports port 901 # SWAT > > acl purge method PURGE > > acl port80 port 80 > > acl CONNECT method CONNECT > > http_access allow manager localhost > > http_access deny manager > > http_access allow purge localhost > > http_access deny purge > > http_access deny !Safe_ports > > http_access deny CONNECT !SSL_ports > > http_access deny to_localhost > > http_access allow port80 > > http_access allow localhost > > http_access deny all > > http_reply_access allow all > > icp_access allow all > > visible_hostname www.mysite.com > > coredump_dir /var/spool/squid > > > > It's situations like these is why I always recommend > using ACL to > crontol the accelerator/reverse proxy access. > > The problem was your "http_access allow port80" - > thats a blanket accept > of any request going to *any* webserver. > > You would do well to add an ACL listing your domain names: > > acl mydomains dstdomain .mysite.com mysite.com > > and using it to control both the peer access and the > acceptable > requests. Like so: > > # pass accelerated domains to the peer > cache_peer_access server_1 allow mydomains > cache_peer_access server_1 deny all > # keep DNS out of the equation. > never_direct allow mydomains > # prevent access through the proxy to anywhere else > http_access allow mydomains > http_access deny all > > instead off all these (adding to the config in their > position would be > good): > > http_access deny CONNECT !SSL_ports > > http_access deny to_localhost > > http_access allow port80 > > http_access allow localhost > > http_access deny all > > It also makes "cache_peer_domain" irrelevant. > > Amos > -- > Please use Squid 2.7.STABLE1 or 3.0.STABLE6
