[squid-users] SSLBUMP for specific domains

Thu Jan 12 21:04:43 UTC 2023

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

# 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 <squid-users-bounces at lists.squid-cache.org> Em Nome De andre.bolinhas at articatech.com
Enviada: 12 de janeiro de 2023 21:03
Para: 'Amos Jeffries' <squid3 at treenet.co.nz>; squid-users at lists.squid-cache.org
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"

-----Mensagem original-----
De: squid-users <squid-users-bounces at lists.squid-cache.org> Em Nome De Amos Jeffries
Enviada: 12 de janeiro de 2023 19:13
Para: squid-users at lists.squid-cache.org
Assunto: Re: [squid-users] SSLBUMP for specific domains

On 13/01/2023 6:37 am, andre.bolinhas wrote:
>
> Hi
>
> It’s possible configure squid to intercept ssl traffic just for a 
> group of domain and leave the all of rest out of ssl interceptation?
>

Yes, with one caveat: that Squid is able to identify the domain/server to make the decision.

> If so, can you send me an example of config?
>
> I have try search for this on Google and in forums but I just find 
> config to intercept all.
>

You will find a simple example here:
<https://wiki.squid-cache.org/Features/SslPeekAndSplice#peek-at-sni-and-bump>

Amos

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