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Add missing &optional attr to KRB record fields

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The KRB parser allowed for the following types/fields to be left
uninitialized, so an &optional attribute was added to reflect that:

  - KRB::Error_Msg
    - pvno
    - msg_type
    - server_time
    - service_realm
    - service_name

  - KRB::KDC_Request
    - kdc_options
    - service_realm
    - till
    - nonce
    - encryption_types

Usages have also been adapted to perform existence checks.
This commit is contained in:
Jon Siwek 2019-05-16 08:52:04 -07:00
parent 72b46268f7
commit f8d7aa2387
2 changed files with 31 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

29
scripts/base/protocols/krb/main.zeek
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@ -118,7 +118,9 @@ event krb_error(c: connection, msg: Error_Msg) &priority=5
c$krb$client = fmt("%s%s", msg?$client_name ? msg$client_name + "/" : "",
msg?$client_realm ? msg$client_realm : "");
c$krb$service = msg$service_name;
if ( msg?$service_name )
c$krb$service = msg$service_name;
c$krb$success = F;
c$krb$error_code = msg$error_code;
@ -139,16 +141,23 @@ event krb_as_request(c: connection, msg: KDC_Request) &priority=5
return;
c$krb$request_type = "AS";
c$krb$client = fmt("%s/%s", msg?$client_name ? msg$client_name : "", msg$service_realm);
c$krb$client = fmt("%s/%s", msg?$client_name ? msg$client_name : "",
msg?$service_realm ? msg$service_realm : "");
if ( msg?$service_name )
c$krb$service = msg$service_name;
if ( msg?$from )
c$krb$from = msg$from;
c$krb$till = msg$till;
if ( msg?$till )
c$krb$till = msg$till;
c$krb$forwardable = msg$kdc_options$forwardable;
c$krb$renewable = msg$kdc_options$renewable;
if ( msg?$kdc_options )
{
c$krb$forwardable = msg$kdc_options$forwardable;
c$krb$renewable = msg$kdc_options$renewable;
}
}
event krb_as_response(c: connection, msg: KDC_Response) &priority=5
@ -188,10 +197,14 @@ event krb_tgs_request(c: connection, msg: KDC_Request) &priority=5
c$krb$service = msg$service_name;
if ( msg?$from )
c$krb$from = msg$from;
c$krb$till = msg$till;
if ( msg?$till )
c$krb$till = msg$till;
c$krb$forwardable = msg$kdc_options$forwardable;
c$krb$renewable = msg$kdc_options$renewable;
if ( msg?$kdc_options )
{
c$krb$forwardable = msg$kdc_options$forwardable;
c$krb$renewable = msg$kdc_options$renewable;
}
}
event krb_tgs_response(c: connection, msg: KDC_Response) &priority=5