RE: FTP server authority issue

I disagree that an FTP exit point program won't solve this one.  Have 
you ever worked with one?  Can you perform a NEWSYS/CRTPF from within 
CL or from QCMDEXC from within RPG?  Yes you can.  Then you can perform 
these from within a FTP exit point program.






TimM@softwarejungle.com on 10/16/98 12:02:51 PM
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Subject:        RE: FTP server authority issue

I disagree with your point that FTP commands run on the server should
obey a different set of authority rules. If I override certain commands
by using a library higher in the list than QSYS and apply certain
authority rules to those commands, I would not expect users to be able
to circumvent those rules by signing on using FTP instead. That's
effectively what's happening here. PUT is an FTP command but it utilizes
OS/400 commands directly - restrictions on the use of CRTPF inherently
effect PUT, but users use two different versions of this CRTPF depending
on whether they use it directly or through PUT. I too can also see IBM's
reason for wanting to use a "pure" version of the CRTPF command, however
I think using the command directly is the wrong approach - referencing
the command authority from the *LIBL while utilizing the QSYS CPP would
be better. Now the user has a dilemma - authorize everyone using FTP to
CRTPF in QSYS (what they were trying to prevent) or pre-create all files
that users PUT to (which is unrealistic in their environment) - not even
an FTP exit routine will solve this one.    

> -----Original Message-----
> From: Patrick Townsend [SMTP:townsend@patownsend.com]
> Sent: Friday, October 16, 1998 12:41 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: FTP server authority issue
> 
> Tim,
> 
> I can see your point about QSTRUPPGM. It is a different class of
> program.
> 
> I'm a little confused about the issue of creating files via put and
> crtpf. I can see why IBM would want to force the put command to use
> the
> QSYS version of the crtpf command (or any internal version that they
> want to use). Put is an FTP concept that has to obey FTP rules, not
> AS/400 rules. If they let you change the way FTP works with put it
> would
> open up nasty support issues for IBM, wouldn't it? 
> 
> The command interface in FTP lets you run commands that are unique to
> the particular server. You can execute the crtpf command or any other
> user-written command you want. No one expects that the command
> interface
> will work the same from one platform to another. 
> 
> Am I missing something?
> Patrick
> 
> Tim McCarthy wrote:
> > 
> > But this is not the way it used to work. I've tried this on a V3R2
> machine
> > and it uses the library list to determine the command to use
> (CRTPF).
> > Whether you are using exit points or not, you still have the
> exposure that
> > two different authority levels exist for a single user depending on
> whether
> > they attempt a file creation option from the command line or use the
> PUT
> > command through the FTP server. (QSTRUPPGM doesn't fall into the
> same
> > category of program - I would expect it to reference a reliable base
> set of
> > commands.)
> > 
> > 
> > At 12:00 PM 10/15/98 -0700, you wrote:
> > >Hi Tim,
> > >
> > >It is quite common for IBM to qualify command usage to point to the
> QSYS
> > >library. Just look at the source for QSTRUPPGM as an example. It
> would
> > >probably take an IBM'er to really answer this question. I would
> suspect
> > >that the proper way to secure FTP is with the exit points. Gee, who
> do
> > >we know who has an FTP security product <g> ???
> > >
> > >Patrick
> > >--
> > >IBM AS/400 communications, FTP automation, and network security
> > >software and consulting services.
> > >
> > >mailto:townsend@patownsend.com
> > >http://www.patownsend.com
> > >
> > >Tim McCarthy wrote:
> > >>
> > >> Can anyone verify this:
> > >>
> > >> A customer is running the OS/400 FTP server under V4R2. They have
> a
> > >> modified system library list that has a user library NEWSYS prior
> to QSYS
> > >> in which they have created versions of IBM commands - one of
> which is
> > >> CRTPF. All users have had authority revoked to the original
> commands in
> > QSYS.
> > >> When running an FTP session, users authorized to the new CRTPF
> command can
> > >> run the command QUOTE RCMD CRTPF QGPL/myfile etc.. successfully.
> However
> > >> when they try to use PUT to send to the file QGPL/myfile (which
> does not
> > >> exist) they get an error "Unable to open or create target file
> MYFILE in
> > >> library QGPL". I've checked out the FTP server job log and the
> library list
> > >> does include NEWSYS in the library list ahead of QSYS.
> Interestingly the
> > >> server joblog error states "Not authorized to command CRTPF in
> library
> > >> QSYS". Has the FTP server program changed to use the CRTPF
> command in QSYS
> > >> explicitely? If so, this would seem to be a security hole.
> > >>
> > >> Tim
> > >> Tim McCarthy
> > >> TrailBlazer Systems Inc.
> > >> AS/400 E-Commerce communications
> > >> +---
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> > Tim McCarthy
> > TrailBlazer Systems Inc.
> > AS/400 E-Commerce communications
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> 
> -- 
> 
> IBM AS/400 communications, FTP automation, and network security
> software and consulting services.
> 
> mailto:townsend@patownsend.com
> http://www.patownsend.com
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