Squid in transparent mode on sites with sni

pox

hello all,

i configured squid as transparent reverse proxy and everything works well, except some sites that ues sni. for example going to https://fcku.it/ squid returns a certificate with a common name 31337.it - that is the certificate of the first site on that same ip.

is this an error in my configuration or should i file a bug?

thanks for reading.

 This file is automatically generated by pfSense
# Do not edit manually !

http_port 192.168.0.1:3128 ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=10MB cert=/usr/local/etc/squid/serverkey.
pem capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:
EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS dhparams=/etc/dh-parameters
.2048 options=NO_SSLv2,NO_SSLv3,SINGLE_DH_USE

http_port 127.0.0.1:3128 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=10MB cert=/usr/local/etc/squid/se
rverkey.pem capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA
+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS dhparams=/etc/dh-pa
rameters.2048 options=NO_SSLv2,NO_SSLv3,SINGLE_DH_USE

https_port 127.0.0.1:3129 intercept ssl-bump generate-host-certificates=on dynamic_cert_mem_cache_size=10MB cert=/usr/local/etc/squid/s
erverkey.pem capath=/usr/local/share/certs/ cipher=EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRS
A+SHA384:EECDH+aRSA+SHA256:EECDH+aRSA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS dhparams=/etc/dh-p
arameters.2048 options=NO_SSLv2,NO_SSLv3,SINGLE_DH_USE

icp_port 0
dns_v4_first off
pid_filename /var/run/squid/squid.pid
cache_effective_user squid
cache_effective_group proxy
error_default_language en
icon_directory /usr/local/etc/squid/icons
visible_hostname localhost
cache_mgr admin@localhost
access_log /squid/logs/access.log
cache_log /squid/logs/cache.log
cache_store_log none
netdb_filename /squid/logs/netdb.state
pinger_enable on
pinger_program /usr/local/libexec/squid/pinger
sslcrtd_program /usr/local/libexec/squid/ssl_crtd -s /var/squid/lib/ssl_db -M 4MB -b 2048
sslcrtd_children 5
sslproxy_capath /usr/local/share/certs/
sslproxy_options NO_SSLv2,NO_SSLv3,SINGLE_DH_USE
sslproxy_cipher EECDH+ECDSA+AESGCM:EECDH+aRSA+AESGCM:EECDH+ECDSA+SHA384:EECDH+ECDSA+SHA256:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH+aR
SA+RC4:EECDH:EDH+aRSA:HIGH:!RC4:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS

logfile_rotate 5
debug_options rotate=5
shutdown_lifetime 3 seconds
# Allow local network(s) on interface(s)
acl localnet src  192.168.0.0/24
forwarded_for delete
via off
httpd_suppress_version_string on
uri_whitespace strip

acl dynamic urlpath_regex cgi-bin \?
cache deny dynamic

cache_mem 64 MB
maximum_object_size_in_memory 256 KB
memory_replacement_policy heap GDSF
cache_replacement_policy heap LFUDA
minimum_object_size 0 KB
maximum_object_size 4 MB
cache_dir ufs /squid/cache 100 16 256
offline_mode off
cache_swap_low 90
cache_swap_high 95
cache allow all
# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:    1440  20%  10080
refresh_pattern ^gopher:  1440  0%  1440
refresh_pattern -i (/cgi-bin/|\?) 0  0%  0
refresh_pattern .    0  20%  4320

#Remote proxies

# Setup some default acls
# From 3.2 further configuration cleanups have been done to make things easier and safer. The manager, localhost, and to_localhost ACL
definitions are now built-in.
# acl localhost src 127.0.0.1/32
acl allsrc src all
acl safeports port 21 70 80 210 280 443 488 563 591 631 777 901  3128 3129 1025-65535
acl sslports port 443 563

# From 3.2 further configuration cleanups have been done to make things easier and safer. The manager, localhost, and to_localhost ACL
definitions are now built-in.
#acl manager proto cache_object

acl purge method PURGE
acl connect method CONNECT

# Define protocols used for redirects
acl HTTP proto HTTP
acl HTTPS proto HTTPS
http_access allow manager localhost

http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !safeports
http_access deny CONNECT !sslports

# Always allow localhost connections
# From 3.2 further configuration cleanups have been done to make things easier and safer.
# The manager, localhost, and to_localhost ACL definitions are now built-in.
# http_access allow localhost

request_body_max_size 0 KB
delay_pools 1
delay_class 1 2
delay_parameters 1 -1/-1 -1/-1
delay_initial_bucket_level 100
delay_access 1 allow allsrc

# Reverse Proxy settings

# Custom options before auth

always_direct allow all
ssl_bump server-first all
# Setup allowed ACLs
# Allow local network(s) on interface(s)
http_access allow localnet
# Default block all to be sure
http_access deny allsrc

reading the docs¹ i seem to understand that ssl_bump server-first all should maybe be set to ssl_bump peek|stare all in squid 3.5?

¹http://wiki.squid-cache.org/Features/SslPeekAndSplice

pox

just a quick question: has someone here squid working in transparent mode with ssl? does it work for you on sites with sni?
just to know if this CAN work.

mepstein

Hi,
In Squid 3.5, ssl_bump server-first all is deprecated and can't be used (at last in transparent mode) for sni sites. This must be fixed by the pfsense developments.

Insert the following code in Custom ACLS (Before Auth) and test navigating to this site: https://sni.velox.ch/

acl step1 at_step SslBump1

ssl_bump peek step1
ssl_bump bump all

For me, this is working very well with gmail.com and other sites using sni.

pox

@mepstein:

Hi,
In Squid 3.5, ssl_bump server-first all is deprecated and can't be used (at last in transparent mode) for sni sites. This must be fixed by the pfsense developments.

Insert the following code in Custom ACLS (Before Auth) and test navigating to this site: https://sni.velox.ch/
acl step1 at_step SslBump1

ssl_bump peek step1
ssl_bump bump all
For me, this is working very well with gmail.com and other sites using sni.

thank you so much mepstein. this solved it nicely.