mirror of
https://github.com/zeek/zeek.git
synced 2025-10-02 14:48:21 +00:00
63 lines
1.8 KiB
Text
63 lines
1.8 KiB
Text
##! Perform full certificate chain validation for SSL certificates.
|
|
|
|
@load base/frameworks/notice
|
|
@load base/protocols/ssl
|
|
|
|
module SSL;
|
|
|
|
export {
|
|
redef enum Notice::Type += {
|
|
## This notice indicates that the result of validating the
|
|
## certificate along with its full certificate chain was
|
|
## invalid.
|
|
Invalid_Server_Cert
|
|
};
|
|
|
|
redef record Info += {
|
|
## Result of certificate validation for this connection.
|
|
validation_status: string &log &optional;
|
|
};
|
|
|
|
## MD5 hash values for recently validated chains along with the
|
|
## validation status message are kept in this table to avoid constant
|
|
## validation every time the same certificate chain is seen.
|
|
global recently_validated_certs: table[string] of string = table()
|
|
&read_expire=5mins &synchronized &redef;
|
|
}
|
|
|
|
event ssl_established(c: connection) &priority=3
|
|
{
|
|
# If there aren't any certs we can't very well do certificate validation.
|
|
if ( ! c$ssl?$cert_chain || |c$ssl$cert_chain| == 0 )
|
|
return;
|
|
|
|
local chain_id = join_string_vec(c$ssl$cert_chain_fuids, ".");
|
|
|
|
local chain: vector of opaque of x509 = vector();
|
|
for ( i in c$ssl$cert_chain )
|
|
{
|
|
if ( c$ssl$cert_chain[i]?$x509 )
|
|
chain[i] = c$ssl$cert_chain[i]$x509$handle;
|
|
}
|
|
|
|
if ( chain_id in recently_validated_certs )
|
|
{
|
|
c$ssl$validation_status = recently_validated_certs[chain_id];
|
|
}
|
|
else
|
|
{
|
|
local result = x509_verify(chain, root_certs);
|
|
c$ssl$validation_status = result$result_string;
|
|
recently_validated_certs[chain_id] = result$result_string;
|
|
}
|
|
|
|
if ( c$ssl$validation_status != "ok" )
|
|
{
|
|
local message = fmt("SSL certificate validation failed with (%s)", c$ssl$validation_status);
|
|
NOTICE([$note=Invalid_Server_Cert, $msg=message,
|
|
$sub=c$ssl$subject, $conn=c,
|
|
$identifier=cat(c$id$resp_h,c$id$resp_p,c$ssl$validation_status)]);
|
|
}
|
|
}
|
|
|
|
|