On Mon, 2017-06-26 at 21:16 +0200, Dominick Grift wrote: > On Mon, Jun 26, 2017 at 03:00:31PM -0400, Stephen Smalley wrote: > > On Mon, 2017-06-26 at 14:24 -0400, Stephen Smalley wrote: > > > On Mon, 2017-06-26 at 19:49 +0200, Dominick Grift wrote: > > > > On Mon, Jun 26, 2017 at 01:41:05PM -0400, Stephen Smalley > > > > wrote: > > > > > On Mon, 2017-06-26 at 19:20 +0200, Dominick Grift wrote: > > > > > > On Mon, Jun 26, 2017 at 01:22:41PM -0400, Stephen Smalley > > > > > > wrote: > > > > > > > On Mon, 2017-06-26 at 18:45 +0200, Dominick Grift wrote: > > > > > > > > On Mon, Jun 26, 2017 at 11:50:10AM -0400, Stephen > > > > > > > > Smalley > > > > > > > > wrote: > > > > > > > > > On Mon, 2017-06-26 at 15:26 +0200, Dominick Grift > > > > > > > > > wrote: > > > > > > > > > > On Mon, Jun 26, 2017 at 09:08:16AM -0400, Stephen > > > > > > > > > > Smalley > > > > > > > > > > wrote: > > > > > > > > > > > On Sat, 2017-06-24 at 12:20 +0200, Laurent > > > > > > > > > > > Bigonville > > > > > > > > > > > wrote: > > > > > > > > > > > > Hello, > > > > > > > > > > > > Russell opened the following bug regarding > > > > > > > > > > > > run_init > > > > > > > > > > > > in > > > > > > > > > > > > the > > > > > > > > > > > > debian > > > > > > > > > > > > bts: > > > > > > > > > > > > ==== > > > > > > > > > > > > [...] > > > > > > > > > > > > It turns out that the problem was not running > > > > > > > > > > > > $(arch), > > > > > > > > > > > > but > > > > > > > > > > > > running > > > > > > > > > > > > run_init in > > > > > > > > > > > > the shell it spawned. Below is an example of > > > > > > > > > > > > reproducing > > > > > > > > > > > > this, > > > > > > > > > > > > the > > > > > > > > > > > > first time > > > > > > > > > > > > run_init performs as expected. The second time > > > > > > > > > > > > is > > > > > > > > > > > > fails > > > > > > > > > > > > without > > > > > > > > > > > > me > > > > > > > > > > > > even > > > > > > > > > > > > typing a password or pressing ENTER. The > > > > > > > > > > > > result is > > > > > > > > > > > > the > > > > > > > > > > > > same > > > > > > > > > > > > with > > > > > > > > > > > > any > > > > > > > > > > > > command, > > > > > > > > > > > > but ls is just a good example. This happens no > > > > > > > > > > > > matter > > > > > > > > > > > > what > > > > > > > > > > > > shell > > > > > > > > > > > > is > > > > > > > > > > > > spawned > > > > > > > > > > > > (whether it's ssh, su, or just an Xterm), > > > > > > > > > > > > run_init > > > > > > > > > > > > seems > > > > > > > > > > > > generally > > > > > > > > > > > > broken with > > > > > > > > > > > > the 4.9.0-2-amd64/4.9.13-1 kernel at least. > > > > > > > > > > > > > > > > > > > > > > > > NB I can't rule out the possibility of a kernel > > > > > > > > > > > > bug > > > > > > > > > > > > at > > > > > > > > > > > > this > > > > > > > > > > > > stage. But at > > > > > > > > > > > > this time it seems best to assume it's a > > > > > > > > > > > > run_init > > > > > > > > > > > > bug > > > > > > > > > > > > until > > > > > > > > > > > > proven > > > > > > > > > > > > otherwise. > > > > > > > > > > > > > > > > > > > > > > > > Sorry for the inconvenience Andreas. > > > > > > > > > > > > > > > > > > > > > > > > # run_init ls /boot > > > > > > > > > > > > Authenticating root. > > > > > > > > > > > > Password: > > > > > > > > > > > > config-4.9.0-2- > > > > > > > > > > > > amd64 lost+found System.map > > > > > > > > > > > > - > > > > > > > > > > > > 4.9.0- > > > > > > > > > > > > 3-amd64 > > > > > > > > > > > > config-4.9.0-3- > > > > > > > > > > > > amd64 memtest86+.bin vmlinuz- > > > > > > > > > > > > 4.9.0-2- > > > > > > > > > > > > amd64 > > > > > > > > > > > > grub memtest86+_multiboot. > > > > > > > > > > > > bin > > > > > > > > > > > > v > > > > > > > > > > > > mlin > > > > > > > > > > > > uz- > > > > > > > > > > > > 4.9.0-3- > > > > > > > > > > > > amd64 > > > > > > > > > > > > initrd.img-4.9.0-2-amd64 real > > > > > > > > > > > > initrd.img-4.9.0-3-amd64 System.map-4.9.0-2- > > > > > > > > > > > > amd64 > > > > > > > > > > > > # run_init ls /boot > > > > > > > > > > > > Authenticating root. > > > > > > > > > > > > Password: > > > > > > > > > > > > run_init: incorrect password for root > > > > > > > > > > > > authentication failed. > > > > > > > > > > > > # > > > > > > > > > > > > ==== > > > > > > > > > > > > I can reproduce this with 2.7-rc3, run_init is > > > > > > > > > > > > compiled > > > > > > > > > > > > with > > > > > > > > > > > > pam > > > > > > > > > > > > and > > > > > > > > > > > > audit support. > > > > > > > > > > > > An idea what could happen here? > > > > > > > > > > > > Regards, > > > > > > > > > > > > Laurent Bigonville > > > > > > > > > > > > https://bugs.debian.org/cgi-bin/bugreport.cgi?b > > > > > > > > > > > > ug=8 > > > > > > > > > > > > 63 > > > > > > > > > > > > 187 > > > > > > > > > > > > > > > > > > > > > > I don't think this could have ever worked under > > > > > > > > > > > run_init > > > > > > > > > > > since > > > > > > > > > > > open_init_pty was introduced (originally from > > > > > > > > > > > Debian); > > > > > > > > > > > note > > > > > > > > > > > that > > > > > > > > > > > open_init_pty does alter terminal settings. > > > > > > > > > > > > > > > > > > > > > > I don't quite follow the example given above. It > > > > > > > > > > > shows > > > > > > > > > > > executing > > > > > > > > > > > run_init twice with ls /boot as the arguments, > > > > > > > > > > > which > > > > > > > > > > > is > > > > > > > > > > > not > > > > > > > > > > > running > > > > > > > > > > > run_init within run_init. That works fine for > > > > > > > > > > > me. > > > > > > > > > > > > > > > > > > > > > > If I try something like: > > > > > > > > > > > run_init run_init ls /boot > > > > > > > > > > > which actually runs run_init within run_init, > > > > > > > > > > > then > > > > > > > > > > > that > > > > > > > > > > > also > > > > > > > > > > > works > > > > > > > > > > > for > > > > > > > > > > > me without problem. > > > > > > > > > > > > > > > > > > > > > > If I try something like: > > > > > > > > > > > run_init /bin/bash > > > > > > > > > > > then I lose any echoing of input characters to > > > > > > > > > > > the > > > > > > > > > > > shell > > > > > > > > > > > (due > > > > > > > > > > > to > > > > > > > > > > > open_init_pty turning it off), but I can enter > > > > > > > > > > > commands > > > > > > > > > > > and > > > > > > > > > > > execute > > > > > > > > > > > them, or run stty sane to regain echoing. But I > > > > > > > > > > > don't > > > > > > > > > > > think > > > > > > > > > > > that > > > > > > > > > > > has > > > > > > > > > > > ever been supported since the introduction of > > > > > > > > > > > open_init_pty > > > > > > > > > > > in > > > > > > > > > > > 2005 > > > > > > > > > > > (policycoreutils 1.21.2). What's the use case > > > > > > > > > > > for > > > > > > > > > > > it? > > > > > > > > > > > > > > > > > > > > > > Side bar: run_init (and open_init_pty) are no > > > > > > > > > > > longer > > > > > > > > > > > packaged > > > > > > > > > > > by > > > > > > > > > > > Fedora > > > > > > > > > > > since systemd renders it unnecessary, and even > > > > > > > > > > > prior > > > > > > > > > > > to > > > > > > > > > > > that, > > > > > > > > > > > Fedora > > > > > > > > > > > policy enabled DIRECT_INITRC=y in build.conf, and > > > > > > > > > > > therefore > > > > > > > > > > > run_init > > > > > > > > > > > > > > > > > > > > Correct me if i am wrong but fedora has > > > > > > > > > > DIRECT_INITRC=n > > > > > > > > > > AFAICT > > > > > > > > > > > > > > > > > > > > https://src.fedoraproject.org/cgit/rpms/selinux-pol > > > > > > > > > > icy. > > > > > > > > > > gi > > > > > > > > > > t/tr > > > > > > > > > > ee/s > > > > > > > > > > elin > > > > > > > > > > ux-policy.spec#n173 > > > > > > > > > > https://src.fedoraproject.org/cgit/rpms/selinux-pol > > > > > > > > > > icy. > > > > > > > > > > gi > > > > > > > > > > t/tr > > > > > > > > > > ee/s > > > > > > > > > > elin > > > > > > > > > > ux-policy.spec#n393 > > > > > > > > > > > > > > > > > > > > I vaguely recall that in a strict environment one > > > > > > > > > > still > > > > > > > > > > might > > > > > > > > > > need > > > > > > > > > > run_init for the `update aliases` functionality in > > > > > > > > > > redhar- > > > > > > > > > > based > > > > > > > > > > distributions.. i might be wrong though > > > > > > > > > > > > > > > > > > run_init is no longer packaged in Fedora at all (see > > > > > > > > > policycoreutils.spec, which removes it during > > > > > > > > > %install so > > > > > > > > > that > > > > > > > > > it > > > > > > > > > will > > > > > > > > > not be packaged). Looking at the ChangeLog, this > > > > > > > > > happened > > > > > > > > > in > > > > > > > > > 2012: > > > > > > > > > * Mon Nov 5 2012 Dan Walsh <dwalsh@xxxxxxxxxx> - > > > > > > > > > 2.1.12- > > > > > > > > > 25 > > > > > > > > > - Remove run_init, no longer needed with systemd. > > > > > > > > > > > > > > > > > > Thus, DIRECT_INITRC=y is no longer required either, > > > > > > > > > for > > > > > > > > > the > > > > > > > > > same > > > > > > > > > reason > > > > > > > > > (obsoleted by systemd). Prior to that change, Fedora > > > > > > > > > built > > > > > > > > > with > > > > > > > > > DIRECT_INITRC=y for -targeted policy; only -mls and > > > > > > > > > -strict > > > > > > > > > built > > > > > > > > > with > > > > > > > > > DIRECT_INITRC=n and needed run_init. > > > > > > > > > > > > > > > > Maybe, I recall that previously Fedora use to hack > > > > > > > > around > > > > > > > > DIRECT_INITRC with unconfined_t but AFAICR it always > > > > > > > > applied > > > > > > > > to > > > > > > > > sysadm_t. > > > > > > > > Does not make any difference though. However I do, kind > > > > > > > > of, > > > > > > > > wonder if > > > > > > > > sysadm_t is currently able to update the aliases db > > > > > > > > with > > > > > > > > sendmail > > > > > > > > (but then again it has been a long time since redhat > > > > > > > > shipped > > > > > > > > with > > > > > > > > sendmail enabled by default) > > > > > > > > > > > > > > > > Nevertheless, gentoo relies on run_init for openrc, and > > > > > > > > in > > > > > > > > debian > > > > > > > > systemd is optional (i think) > > > > > > > > > > > > > > > > Normally I am all for removing as much as possible, but > > > > > > > > with > > > > > > > > run_init > > > > > > > > I have mixed feelings, because systemd has been and is > > > > > > > > a > > > > > > > > headache > > > > > > > > IMHO > > > > > > > > > > > > > > > > No one was able to confirm it but last lime i tried the > > > > > > > > "service > > > > > > > > enable/disable" access vector was broken. Atleast with > > > > > > > > good > > > > > > > > old > > > > > > > > sysvinit/upstart we didnt have to depend selinux > > > > > > > > extension > > > > > > > > code > > > > > > > > to be > > > > > > > > able to control this as it was all transparent. > > > > > > > > > > > > > > You'll have to clarify what you mean by "broken" here, > > > > > > > preferably > > > > > > > with > > > > > > > a reproducer. > > > > > > > > > > > > > > > > > > > In fedora 26 i noticed that the "service disable/enable" > > > > > > checks > > > > > > were > > > > > > no longer performed. > > > > > > > > > > > > In other words confined administrators were able to > > > > > > disable/enable > > > > > > arbitrary service units. > > > > > > > > > > > > https://tfirg.undo.it/wordpress/dssp2-confined-administrato > > > > > > rs-a > > > > > > nd > > > > > > -a-w > > > > > > hat-looks-to-be-a-bug-in-systemd-233/ > > > > > > > > > > Did you file a bug (against Fedora)? Can you reproduce with > > > > > their > > > > > policy? > > > > > > > > Not yet i was hoping that some one on IRC or whatever was able > > > > to > > > > produce it, should be pretty simple to do: > > > > > > > > 1. use systemd v233 and/or Fedora 26 > > > > 2. add a auditallow rule like this: (auditallow domain > > > > systemd_unit_file_type (service (enable disable))) > > > > 3. disable and enable some service units to see if the check is > > > > triggered > > > > > > I don't see any USER_AVC messages produced by that on F26 > > > (systemd > > > 233) > > > or F25 (systemd 231). I do see them on CentOS 7.3 (systemd > > > 119). > > > Looks like a regression in systemd. > > > > Is this due to the following change: > > https://github.com/systemd/systemd/commit/8faae625dc9b6322db452937f > > 54176e56e65265a > > > > If so, then that goes back to systemd v225, and affects Fedora 24 > > and > > later. > > > > > > I do not know what to say. No point in filing the issue because there > is no one to tackle this anyway. > The systemd people are only "SELinux gurus" when it comes to removing > SELinux code (after they adopt it) but not when it comes to adding a > line of SELinux code; then they refuse claiming they are no "SELinux > guru" > The author of this code abandoned ship ... so I guess we'll have to > make do There is already an (old) systemd issue for it - 1050, cited by the aforementioned commit (and on which you commented originally). But it would probably help to open a bug against Fedora for it and add the Fedora SELinux folks to it. If that fails to get any traction, then open an issue in the selinux github project so that it doesn't get lost and maybe I or someone else will fix it someday.
