On Fri, 2007-12-21 at 10:31 -0600, Xavier Toth wrote: > Works for me, thanks. Ok, merged to trunk version of newrole. As usual, if you want something like this in an existing distro release (e.g. RHEL5), you'll have to bugzilla it there and get it queued for an update. > > On Dec 21, 2007 10:00 AM, Stephen Smalley <sds@xxxxxxxxxxxxx> wrote: > > > > On Mon, 2007-12-17 at 12:40 -0800, Reed, Tim (US SSA) wrote: > > > Lets try this again....Patch Try #3 > > > > This looks ok to me, although it doesn't apply cleanly on the trunk, and > > the coding style still needs fixing (but I suppose make indent will fix > > it up). > > > > Does anyone else have any comments on this? Does it meet Ted's need > > too? > > > > I tried running a program that detached the tty and then invoked the > > patched newrole with a command, and as expected, if configured to use > > pam modules that required authentication, it just failed at that point > > with an authentication failed error, and otherwise, it proceeded without > > problem. > > > > > > > -----Original Message----- > > > From: owner-selinux@xxxxxxxxxxxxx [mailto:owner-selinux@xxxxxxxxxxxxx] > > > On Behalf Of Stephen Smalley > > > Sent: Monday, December 17, 2007 11:10 AM > > > To: Reed, Tim (US SSA) > > > Cc: Xavier Toth; SE Linux > > > Subject: RE: newrole in the background > > > > > > On Mon, 2007-12-17 at 08:01 -0800, Reed, Tim (US SSA) wrote: > > > > When newrole goes and grabs the ttyname, if it cannot get one should > > > it > > > > still log something to the screen or not? > > > > > > > > Currently it says "Error! Could not retrieve tty information". I was > > > > thinking of changing Error to Warning. > > > > > > Yes, that's fine. > > > > > > > > What is the recommendation here? > > > > Also do you have the coding standards posted somewhere? > > > > > > We just loosely follow kernel coding style, > > > http://lxr.linux.no/linux/Documentation/CodingStyle > > > and make indent can be used as a hammer (but not a very good one). > > > > > > > > > > > -----Original Message----- > > > > From: Stephen Smalley [mailto:sds@xxxxxxxxxxxxx] > > > > Sent: Thursday, December 13, 2007 12:40 PM > > > > To: Reed, Tim (US SSA) > > > > Cc: Xavier Toth; SE Linux > > > > Subject: RE: newrole in the background > > > > > > > > On Thu, 2007-12-13 at 09:06 -0800, Reed, Tim (US SSA) wrote: > > > > > New patch...I have added checks around the calls that deal with the > > > > tty. > > > > > So if ttyn is an empty string (something had a heartache with it > > > being > > > > > NULL) then it skips the processing. It does appear to work but more > > > > > testing is needed. Please review and comment. > > > > > > > > Patch is reversed, and doesn't seem to be complete (test for a NULL > > > > ttyname still remains and is fatal in main). > > > > > > > > ttyn should really be NULL if not defined - just fix the code. > > > Cleaner > > > > and faster to test for NULL than for empty string. Looks like > > > > authenticate_via_pam() needs a check. > > > > > > > > You can simplify the logic a fair amount, e.g. on entry to > > > relabel_tty() > > > > and restore_tty_label(), just do a if (!ttyn) return 0; > > > > > > > > Coding style doesn't match. > > > > > > > > > Now say if someone ran `newrole -l SystemHigh -- -c "su - foo"` in > > > the > > > > > background of a script, you would not be able to give su input as it > > > > is > > > > > in the background and has no tty. su in this case exits gracefully > > > I > > > > > guess you could say. > > > > > > > > > > My point is that if you have an application that needs to run from > > > > > newrole, in the background AND requires user input, you will not be > > > > able > > > > > to give the application input while it is in the background and have > > > > it > > > > > work successfully. > > > > > > > > You can't do that anyway, by definition. > > > > > > > > > Example: > > > > > foo.sh > > > > > --------------- > > > > > #!/bin/bash > > > > > > > > > > ./bar.sh & > > > > > --------------- > > > > > bar.sh > > > > > --------------- > > > > > #!/bin/bash > > > > > > > > > > su - root -c /bin/date > > > > > --------------- > > > > > > > > > > su exits because there is no tty for input. So is chasing down > > > having > > > > > newrole run in a pseudo tty in the background and accept input worth > > > > the > > > > > time? > > > > > > > > It doesn't help - there is no input to accept. > > > > > > > > We just need to make sure that the pam modules and chkpwd don't block > > > > forever or seg fault when handed a NULL PAM_TTY. > > > > > > -- > > Stephen Smalley > > National Security Agency > > > > -- Stephen Smalley National Security Agency -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@xxxxxxxxxxxxx with the words "unsubscribe selinux" without quotes as the message.
