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Add analyzer for GSI mechanism of GSSAPI FTP AUTH method.

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GSI authentication involves an encoded TLS/SSL handshake over the FTP
control session.  Decoding the exchanged tokens and passing them to an
SSL analyzer instance allows use of all the familiar script-layer events
in inspecting the handshake (e.g. client/server certificats are
available).  For FTP sessions that attempt GSI authentication, the
service field of the connection record will have both "ftp" and "ssl".

One additional change is an FTP server's acceptance of an AUTH request
no longer causes analysis of the connection to cease (because further
analysis likely wasn't possible).  This decision can be made more
dynamically at the script-layer (plus there's now the fact that further
analysis can be done at least on the GSSAPI AUTH method).
This commit is contained in:
Jon Siwek 2012-10-05 10:43:23 -05:00
parent 2ac6fab5fc
commit 49b8c7e390
10 changed files with 188 additions and 25 deletions
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6
scripts/base/protocols/ftp/main.bro
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@ -96,11 +96,11 @@ redef record connection += {
};
# Configure DPD
const ports = { 21/tcp } &redef;
redef capture_filters += { ["ftp"] = "port 21" };
const ports = { 21/tcp, 2811/tcp } &redef;
redef capture_filters += { ["ftp"] = "port 21 and port 2811" };
redef dpd_config += { [ANALYZER_FTP] = [$ports = ports] };
redef likely_server_ports += { 21/tcp };
redef likely_server_ports += { 21/tcp, 2811/tcp };
# Establish the variable for tracking expected connections.
global ftp_data_expected: table[addr, port] of Info &create_expire=5mins;