[squid-users] SSLBUMP for specific domains

[Amos Jeffries]

On 13/01/2023 10:04 am, andre.bolinhas wrote:
> Forgot to attach the config file
>
> root at proxy01:~# cat /etc/squid3/ssl.conf
> # Squid 5.x branch
> # SSL used for port ID 1, :3128 on
> # Patch 2020 - 08 - 03 SquidMikrotikEnabled = 0
> # SSL Proxy options  Proxy version:5.7 [146]
> sslcrtd_program /lib/squid3/security_file_certgen -s /media/squidtmpfs/ssl/ssl_db -M 64MB
> sslcrtd_children 32 startup=5 idle=1 queue-size=64
> acl AnnotateSSLGBW2 annotate_transaction whitelistssl=yes
> #The AppStore application in IOS (iPhone, iPad, MacOS) uses SSL Certificate Pinning,
> #it means the application knows what certificate to expect when accessing AppStore.
> #When you enable SSL Bump of HTTPS connections Squid replaces the default certificate with a ‘mimicked’ one;
> #the application detects that and refuses to function.
> #
> acl FakeCert ssl::server_name .apple.com
> acl FakeCert ssl::server_name .icloud.com
> acl FakeCert ssl::server_name .mzstatic.com
> acl FakeCert ssl::server_name .dropbox.com
> acl FakeCert ssl::server_name .bnpparisbas
> acl SSLInternalNets dst 10.0.0.0/8
> acl SSLInternalNets dst 172.16.0.0/12
> acl SSLInternalNets dst 192.168.0.0/16
> acl ssl_step1 at_step SslBump1
> acl ssl_step2 at_step SslBump2
> acl ssl_step3 at_step SslBump3
> include /etc/squid3/ssl_whitelist.conf
> ssl_bump peek ssl_step1
> acl GlobalWhitelistDSTNet dst "/etc/squid3/acls_whitelist.dst.conf"
> ssl_bump splice GlobalWhitelistDSTNet AnnotateSSLGBW2
> ssl_bump splice ByPassRBL AnnotateSSLGBW2
> ssl_bump splice SSLInternalNets AnnotateSSLGBW2
> ssl_bump splice FakeCert AnnotateSSLGBW2
> # IMPRIM_RULE:5
> ssl_bump splice ByPassRBL AnnotateSSLGBW2
> ssl_bump splice GlobalWhitelistDSTNet AnnotateSSLGBW2

FYI, Those two lines are duplicates of the first ssl_bump rules. They do 
nothing here except waste CPU cycles.


> # Rules (spliced) added by admins....
> # 5 rules...
> # -------------- Personal rules -----------------
>
> # id:5
> # decrypt_cnn order:0
> acl AnnotateSSLW5 annotate_transaction bumprule=5
> ssl_bump bump Group26 AnnotateSSLW5
> ssl_bump splice all
>
> tls_outgoing_options options=NO_SSLv3,NO_TICKET cipher=ALL:!SSLv2:!SSLv3:!ADH:!DSS:!MD5:!EXP:!DES:!PSK:!SRP:!RC4:!IDEA:!SEED:!aNULL:!eNULL flags=DONT_VERIFY_PEER
> sslproxy_cert_error allow all
> on_unsupported_protocol tunnel all
>
> -----Mensagem original-----
> De: squid-users Em Nome De andre.bolinhas
> Enviada: 12 de janeiro de 2023 21:03
> Assunto: Re: [squid-users] SSLBUMP for specific domains
>
> Hi Amos
> Thansk for your quick reply, I have done it as example but now, even the internet surf is ok for all website I get to many TCP_TUNNEL/500  on access.log for all  websites that we are not decrypting
>
> 1673531433.924  31315 192.168.60.30 TCP_TUNNEL/500 4096 CONNECT sapo.pt:443 - HIER_DIRECT/213.13.146.142:443 - mac="d6:8b:66:2a:9b:92" accessrule:%20ntlm_white_dstdomain%0D%0Awebfilter:%20pass%0D%0Acategory:%203%0D%0Acategory-name:%20Society%0D%0Aclog:%20cinfo:3-Society;%0D%0A exterr="-|- splice"
> 1673531433.933  31324 192.168.60.30 TCP_TUNNEL/500 4695 CONNECT sapo.pt:443 - HIER_DIRECT/213.13.146.142:443 - mac="d6:8b:66:2a:9b:92" accessrule:%20ntlm_white_dstdomain%0D%0Awebfilter:%20pass%0D%0Acategory:%203%0D%0Acategory-name:%20Society%0D%0Aclog:%20cinfo:3-Society;%0D%0A exterr="-|- splice"
> 1673531437.798  35024 192.168.60.30 TCP_TUNNEL/500 76572 CONNECT www.sapo.pt:443 - HIER_DIRECT/213.13.146.142:443 - mac="d6:8b:66:2a:9b:92" accessrule:%20ntlm_white_dstdomain%0D%0Awebfilter:%20pass%0D%0Acategory:%203%0D%0Acategory-name:%20Society%0D%0Aclog:%20cinfo:3-Society;%0D%0A exterr="-|- splice"

By the differences on size and the existence of a remote server IP 
address in the log entry, I guess this is 
<https://bugs.squid-cache.org/show_bug.cgi?id=5252>.

Amos