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- Newsgroups: comp.databases.oracle
- Path: sparky!uunet!munnari.oz.au!yarrina.connect.com.au!cmutual.com.au!aaj
- From: aaj@cmutual.com.au (Tony Jambu)
- Subject: Re: OPS$LOGIN :security hole?
- Message-ID: <1992Dec23.072030.19046@cmutual.com.au>
- Keywords: OPS$LOGIN security SQL*Net
- Sender: aaj@cmutual.com.au (Tony Jambu)
- Organization: Colonial Mutual Group
- References: <1go861INN4hv@rave.larc.nasa.gov> <1992Dec17.003907.26151@pmafire.inel.gov> <1992Dec17.184923.24754@ncsa.uiuc.edu> <1992Dec17.222051.950@pmafire.inel.gov>
- Date: Wed, 23 Dec 1992 07:20:30 GMT
- Lines: 116
-
-
- Quite a lot of discussion have been going on about Oracle's security,
- OPS$LOGIN and SQL*Net. I am in the process of finishing a report for our
- Internal Audit Division that explains what the problems are and how to
- overcome them. If you interested in the report, I could post it to in the
- New Year. I do not pretend to know all the answers and could be wrong in
- some of my facts. If so, please correct me but no flames. In the short
- term, this is a summary and it applies to Oracle V6 only!
-
-
- I hope the following information will clarify some of the misconceptions about
- Oracle security, OPS$LOGIN and SQL*Net eg
-
- >The only way the ops$ account works without a password is when you are
- >directly logged into the host server at the OS level. If you connect to
- >the host via SQL*Net, the RDBMS will require entry of the password.
-
- >I believe what oracle does with the autologin feature is just use the
- >current
- >user's operating system userid to come up with the ops$user account, then
- >automatically log into that account using whatever password you gave it,
-
- >What I do is make all accounts autologin, but assign a different password
- >for each one and the passwords never change. No one ever needs to know
- >what their password is, and no one can log into anyone else's account
- >since they don't know what the oracle password is (unless, of course, they
- >know the person's operating system password and log into that).
-
- >IN UNIX (sunos4.12) the conventions
- >sqlplus /
- >sqlplus OPS$user/bogus
- >will both work
-
- You need to quote the OPS$user/bogus with 'OPS$user/bogus'
-
- >The only way the ops$ account works without a password is when you are
- >directly logged into the host server at the OS level. If you connect to
- >the host via SQL*Net, the RDBMS will require entry of the password.
-
- Not true. This is probably the case at your site because your DBA has chosen
- so.
-
-
- Point 1
- ------
- ANY OPS$LOGIN account can change its oracle password by using the command.
- 'grant connect to ops$login identified by password'
-
- So no matter what password the DBA gives you, you can always change it.
-
- Point 2
- ------
- 'sqlplus / ' works only is you have an Oracle OPS$LOGIN in the database.
-
- Point 3
- ------
- On UNIX, sqlplus or any Oracle programs for that matter will examine and
- use your 'User login name' not the User ID ie UID, for the OPS$LOGIN on the
- server where the database your are trying to access resides. That is,
- LOGIN is your Op/Sys Login Name.
-
-
- Point 4
- ------
- It is possible to login across the network using
- 'sqlplus /@T:machine:SID'
- without specifying a password.
-
- To be able to login across the network using ops$login you MUST have an
- OPERATING SYSTEM account on the Server and the server database must have an
- Oracle OPS$LOGIN user.
-
- Point 5
- ------
- It is possible to shutdown or create havoc on a remote database across the
- network using the same principle as above. What it all boils down to is
- - does the remote server have an op/sys account name the same as the one
- you are using on your local server
- - does the op/sys account belong to the DBA group on the remote server
-
-
- So how to you get around
- 1. OPS$login across the network
-
- ANSWER: Start up orasrv with 'opsoff'
-
- 2. Unauthorised DBA access across the net
-
- ANSWER: Start up orasrv with 'opsoff' AND 'dbaoff'
-
-
- Point 6
- -------
- Even with opsoff, you may still use the op$login if you are connecting to a
- local database.
-
-
-
- The real security issue is not to do with OPS$LOGIN but unauthorised DBA
- commands across the network like 'shutdown immediate' and 'connect internal'
-
-
- I have validated the above points at my site and it may differ from yours. If
- you find any of the points incorrect please email me .
-
-
- thanks
- tony
-
-
-
- --
- _____ ________ / ____ |Tony Jambu, Database Administrator
- /_ __ /_ __ / |Colonial Mutual Invest Mgmt Aust (ACN 004021809)
- /(_)/ ((_/ \_/(///(/_)/_( |EMAIL: TJambu@cmutual.com.au
- \_______/ |PHONE: +61-3-6418448 FAX: +61-3-6076198
-