Snort mailing list archives
RE: ACID Alert Cache Empty
From: Kevin Brown <Kevin.M.Brown () asu edu>
Date: Wed, 24 Jul 2002 11:36:14 -0700
I still haven't found a solution for this. I did go to cvs to see what the difference between the 104 and 105 schemas are and the only thing that was changed was the version number stuck into the database. I have tried downgrading software on the system to see if that fixes it (one program at a time). Still no success. Backed down to ADODB 2.1.2, php 4.1.2, acid .9.6b18. The only thing I haven't reinstalled is MySQL, but I can't see a reason why a minor version number change would cause this. As a test I brought all the programs back up to date (ADODB 2.2.1, PHP 4.2.2, ACID .9.6b22), then went to an archive db that was logged to by an older version of snort to schema 104 of the db (archive is from last october). Dropped the acid created tables, then using ACID rebuilt them and loaded the page. All the alerts were moved to the cache, so I'm left with only one conclusion. The problem must be with snort itself and the way it is logging to the MySQL database that is causing the issue. Currently have Snort 1.9-dev build 167 running on the sensor. -----Original Message----- From: Kevin Brown To: ''Snort-users ' ' Sent: 7/22/02 9:29 AM Subject: RE: [Snort-users] ACID Alert Cache Empty Well I still haven't been able to isolate the cause of this problem. Near the end of last weeks archive ACID started moving some of the alerts into the alert cache. Unfortunately only 600,000 of the nearly 1.4 million alerts were moved to the cache. This weeks current alerts are again not being moved to the cache. I don't know what broke it other than possibly moving up to schema 105 of the database. P.S. Just went through the weekly archives and sure enough the cache stopped pulling all the alerts up into it after moving to schema 105. Only reason I did move up was because snort complained about schema 104. -----Original Message----- From: Imran William Smith To: Kevin Brown Cc: 'Snort-users ' Sent: 7/21/02 4:49 PM Subject: Re: [Snort-users] ACID Alert Cache Empty IT's not a single function, it's about 5 inserts, 1 for TCP, 1 for UDP, etc. I think it's acid_cache.inc You'll still need to implement something similar to the below algorithm if you want it to run exactly how acid does it at the moment. Or at least, make sure you do it sensor by sensor. I'd be grateful if you let me know what the cause was... Imran -- Imran William Smith Security Products Development Mimos Bhd, Malaysia ----- Original Message ----- From: Kevin < mailto:Kevin.M.Brown () asu edu <mailto:Kevin.M.Brown () asu edu> > Brown To: 'Imran William Smith ' < mailto:iwsmith () mimos my <mailto:iwsmith () mimos my> > ; 'Kevin Brown < mailto:Kevin.M.Brown () asu edu <mailto:Kevin.M.Brown () asu edu> > ' Cc: 'Snort-users ' < mailto:Snort-users () lists sourceforge net <mailto:Snort-users () lists sourceforge net> > Sent: Friday, July 19, 2002 11:23 PM Subject: RE: [Snort-users] ACID Alert Cache Empty Sorry, should have been more clear. I dropped the ACID cache and event tables from the mysql command prompt (drop table <table name>), then went to the PHP frontend and it remade the tables from the script that came with ACID (create_acid_tbls_mysql.sql). Still no data is being propogated from the event table (which has continued to grow) to the acid_event table. I guess I'll try to find the function in ACID that updates the ACID cache tables and see if I can run it from the mysql prompt on the server. -----Original Message----- From: Imran William Smith To: Kevin Brown Cc: Snort-users Sent: 7/18/02 6:15 PM Subject: Re: [Snort-users] ACID Alert Cache Empty The algorithm acid uses is something like for each sensor get highest sid in acid_event table -> (call it acid_event_max_sid) for all rows in event where event.sid > acid_event_max_sid insert corresponding rows into acid_event end for end for This all has to happen this way, because MySQL does not handle the where not exists (subquery) structure, which would mean the whole thing could be done in a single query. So my guess is some auto-increment problem is stopping the insert happening, Acid somehow thinks acid_event is already full. You could try dropping and recreate the acid_event table. That might probably solve it. Because when you say 'rebuilding', I presume you mean 'rebuilding' in the frontend, rather than a drop ; create operation. So you've totally reset the snort schema, but not the acid schema. -- Imran William Smith Security Products Development Mimos Bhd, Malaysia ----- Original Message ----- From: Kevin < mailto:Kevin.M.Brown () asu edu <mailto:Kevin.M.Brown () asu edu> < mailto:Kevin.M.Brown () asu edu <mailto:Kevin.M.Brown () asu edu> > > Brown To: 'snort-users () lists sourceforge net' < mailto:'snort-users () lists sourceforge net' <mailto:'snort-users () lists sourceforge net'> < mailto:'snort-users () lists sourceforge net' <mailto:'snort-users () lists sourceforge net'> > > Sent: Friday, July 19, 2002 12:57 AM Subject: [Snort-users] ACID Alert Cache Empty An issue seems to have popped up this week with Snort (1.9-dev from CVS) and ACID (0.9.6b22). MySQL Server setup: ACID 0.9.6b22 MySQL 3.23.51 Schema 105 ADODB 2.12 Last week worked fine. Snort was logging to the MySQL server and ACID would properly update the cache with the new events. This week it is properly logging to the db, but ACID won't update the cache of events. What happens (and this has been working for almost a year) is that on Sunday night the old database is moved to a new folder and a new snort database (completely empty) is put into place by rerunning the db schema creation script (create_mysql). I have tried deleting the ACID cache tables and rebuilding them, but it still didn't update the chache with the now over 700,000 alerts. I can go to the "Cache and Status" page and see that the database has has a large number of alerts, but it shows 0 for the cached events. Hit update alert cache and it adds 0 alerts to the cache. Repair tables doesn't seem to do anything, nor does Rebuild Alert Cache from the same page. No software has been changed while I was gone. Any other suggestions?
Current thread:
- ACID Alert Cache Empty Kevin Brown (Jul 18)
- Re: ACID Alert Cache Empty Imran William Smith (Jul 18)
- <Possible follow-ups>
- RE: ACID Alert Cache Empty Kevin Brown (Jul 19)
- Re: ACID Alert Cache Empty Imran William Smith (Jul 21)
- RE: ACID Alert Cache Empty Kevin Brown (Jul 22)
- RE: ACID Alert Cache Empty Kevin Brown (Jul 24)