Writing custom rule for SSL 401 errors

["Eric Joe" <sysop () tje1 com>]

Hello,
I am trying to write a snort rule that sends an alert when someone gets a
401 "Authorization Required" error while using SSL. I have the non-SSL
rule working as such
alert tcp $HTTP_SERVERS $HTTP_PORTS -> $EXTERNAL_NET any (msg:"ATTACK
RESPONSES Http Failed Authorization"; content: "HTTP/1.\
1 401 "; flags:A+; classtype:bad-unknown; sid:1000001; rev:1;)

It works fine, but with SSL encryption I am having trouble with the
"content" parameter. I guess if I knew what HTTP/1.1 401  looked like when
its encrypted, it would be a piece of cake.
Anyone have any insight on this?  Thanks in advance.


-- 
Eric Joe
Network Operations
Journey's End Internet/Computer Connection Inc




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