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9fd7816501
This makes it much easier for protocols where the mime type is known in advance like, for example, TLS. We now do no longer have to perform deep script-level magic.
136 lines
3.3 KiB
Text
136 lines
3.3 KiB
Text
@load ./main
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@load base/utils/conn-ids
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@load base/frameworks/files
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@load base/files/x509
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module KRB;
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export {
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redef record Info += {
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# Client certificate
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client_cert: Files::Info &optional;
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# Subject of client certificate, if any
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client_cert_subject: string &log &optional;
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# File unique ID of client cert, if any
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client_cert_fuid: string &log &optional;
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# Server certificate
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server_cert: Files::Info &optional;
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# Subject of server certificate, if any
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server_cert_subject: string &log &optional;
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# File unique ID of server cert, if any
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server_cert_fuid: string &log &optional;
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};
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## Default file handle provider for KRB.
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global get_file_handle: function(c: connection, is_orig: bool): string;
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## Default file describer for KRB.
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global describe_file: function(f: fa_file): string;
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}
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function get_file_handle(c: connection, is_orig: bool): string
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{
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# Unused. File handles are generated in the analyzer.
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return "";
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}
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function describe_file(f: fa_file): string
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{
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if ( f$source != "KRB_TCP" && f$source != "KRB" )
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return "";
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if ( ! f?$info || ! f$info?$x509 || ! f$info$x509?$certificate )
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return "";
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# It is difficult to reliably describe a certificate - especially since
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# we do not know when this function is called (hence, if the data structures
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# are already populated).
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#
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# Just return a bit of our connection information and hope that that is good enough.
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for ( cid in f$conns )
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{
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if ( f$conns[cid]?$krb )
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{
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local c = f$conns[cid];
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return cat(c$id$resp_h, ":", c$id$resp_p);
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}
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}
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return cat("Serial: ", f$info$x509$certificate$serial, " Subject: ",
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f$info$x509$certificate$subject, " Issuer: ",
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f$info$x509$certificate$issuer);
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}
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event bro_init() &priority=5
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{
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Files::register_protocol(Analyzer::ANALYZER_KRB_TCP,
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[$get_file_handle = KRB::get_file_handle,
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$describe = KRB::describe_file]);
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Files::register_protocol(Analyzer::ANALYZER_KRB,
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[$get_file_handle = KRB::get_file_handle,
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$describe = KRB::describe_file]);
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}
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event file_over_new_connection(f: fa_file, c: connection, is_orig: bool) &priority=5
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{
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if ( f$source != "KRB_TCP" && f$source != "KRB" )
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return;
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local info: Info;
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if ( ! c?$krb )
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{
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info$ts = network_time();
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info$uid = c$uid;
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info$id = c$id;
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}
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else
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info = c$krb;
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if ( is_orig )
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{
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info$client_cert = f$info;
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info$client_cert_fuid = f$id;
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}
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else
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{
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info$server_cert = f$info;
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info$server_cert_fuid = f$id;
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}
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c$krb = info;
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}
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function fill_in_subjects(c: connection)
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{
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if ( !c?$krb )
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return;
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if ( c$krb?$client_cert && c$krb$client_cert?$x509 && c$krb$client_cert$x509?$certificate )
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c$krb$client_cert_subject = c$krb$client_cert$x509$certificate$subject;
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if ( c$krb?$server_cert && c$krb$server_cert?$x509 && c$krb$server_cert$x509?$certificate )
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c$krb$server_cert_subject = c$krb$server_cert$x509$certificate$subject;
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}
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event krb_error(c: connection, msg: Error_Msg)
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{
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fill_in_subjects(c);
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}
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event krb_as_response(c: connection, msg: KDC_Response)
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{
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fill_in_subjects(c);
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}
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event krb_tgs_response(c: connection, msg: KDC_Response)
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{
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fill_in_subjects(c);
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}
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event connection_state_remove(c: connection)
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{
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fill_in_subjects(c);
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}
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