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Awful fix for SSH login detection.

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- We need a counted measure of payload bytes (not ack tracking and
  not with the IP header which is what we have now).
This commit is contained in:
Seth Hall 2011-10-27 09:41:34 -04:00
parent cbc9df5942
commit ae3ae9a75b
1 changed files with 14 additions and 8 deletions
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18
scripts/base/protocols/ssh/main.bro
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@ -103,16 +103,22 @@ function check_ssh_connection(c: connection, done: bool)
return;
# Make sure conn_size_analyzer is active by checking
# resp$num_bytes_ip
# resp$num_bytes_ip. In general it should always be active though.
if ( ! c$resp?$num_bytes_ip )
return;
local server_bytes = c$resp$num_bytes_ip -
c$resp$num_pkts*32 - # Cut the TCP header
c$resp$num_pkts*20; # Cut the IP header (TODO: fix for IPv6)
# Remove the IP and TCP header length from the total size.
# TODO: Fix for IPv6. This whole approach also seems to break in some
# cases where there are more header bytes than num_bytes_ip.
local header_bytes = c$resp$num_pkts*32 + c$resp$num_pkts*20;
local server_bytes = c$resp$num_bytes_ip;
if ( server_bytes >= header_bytes )
server_bytes = server_bytes - header_bytes;
else
server_bytes = c$resp$size;
# If this is still a live connection and the byte count has not
# crossed the threshold, just return and let the resheduled check happen later.
# If this is still a live connection and the byte count has not crossed
# the threshold, just return and let the rescheduled check happen later.
if ( ! done && server_bytes < authentication_data_size )
return;