From: "Paul Melson" <pmelson@gmail.com>
I'm using snort 2.7 on two machines, one at a hub next to the router
and the firewall and since yesterday a second sensor on my proxy
(squid). All web-traffic must go through the proxy.
The first sensor gives information about e.g. that one uses google
desktop but does not say which client (of course, as source is the
proxy). So I installed snort as a second sensor on the proxy but
without success. The alerts the first sensors finds are not found on
the second sensor (the squid protocol might differ from HTTP).
Is there a way to configure snort to reveal which exact client "breaks"
policies?
Add 3128 to HTTP_PORTS in your snort.conf. All of your HTTP rules
will be looking on port 80 and the traffic to thw proxy is on 3128.
Still no luck. I get tons of 'http_inspect', lots of 'icmp' stuff, but no
single 'porn', 'Google Desktop', ... is caught (while on the external sensor
it is; and I use the same configuration as on the external sensor and only
changed EXTERNAL_NET).
var HOME_NET [192.168.0.0/24,192.168.1.0/24,192.168.2.0/24]
var EXTERNAL_NET any
#var EXTERNAL_NET 192.168.1.70/32
[...]
var HTTP_SERVERS $HOME_NET
[...]
var WWW_SERVERS $HOME_NET
[...]
var HTTP_PORTS 3128
[...]
var RULE_PATH /usr/local/etc/snort/rules
[...]
[...]
preprocessor http_inspect: global iis_unicode_map unicode.map 1252
preprocessor http_inspect_server: \
server default \
apache_whitespace no \
ascii no \
bare_byte no \
chunk_length 500000 \
flow_depth 1460 \
directory no \
double_decode no \
iis_backslash no \
iis_delimiter no \
iis_unicode no \
multi_slash no \
non_strict \
oversize_dir_length 500 \
ports { 80 2301 3128 8000 8080 8180 8888 } \
u_encode yes \
non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \
webroot no
[...]
include $RULE_PATH/policy.rules
include $RULE_PATH/porn.rules
[...]
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