foreman-nightly-rpm-pipeline 946 failed

jenkins · February 17, 2021, 10:37pm

Foreman RPM nightly pipeline failed:

https://ci.theforeman.org/job/foreman-nightly-rpm-pipeline/946/

foreman-pipeline-foreman-nightly-centos7-install (failed)
foreman-pipeline-foreman-nightly-centos8-install (failed)
foreman-pipeline-foreman-nightly-centos7-upgrade (failed)
foreman-pipeline-foreman-nightly-centos8-upgrade (failed)

ekohl · February 18, 2021, 12:28am

1..1
not ok 1 ensure no SELinux denials
# (in test file fb-verify-selinux.bats, line 12)
#   `[ "${status}" -eq 1 ]' failed
# ----
# time->Wed Feb 17 22:13:24 2021
# type=PROCTITLE msg=audit(1613600004.938:2167): proctitle=72756279002F7573722F73686172652F666F72656D616E2F62696E2F7261696C7300736572766572002D2D656E7669726F6E6D656E740070726F64756374696F6E
# type=SYSCALL msg=audit(1613600004.938:2167): arch=c000003e syscall=83 success=no exit=-13 a0=4a60f20 a1=1ff a2=1d6ef30 a3=7ffcf4c8f160 items=0 ppid=1 pid=12564 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="ruby" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600004.938:2167): avc:  denied  { write } for  pid=12564 comm="ruby" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0
# ----
# time->Wed Feb 17 22:13:24 2021
# type=PROCTITLE msg=audit(1613600004.938:2168): proctitle=72756279002F7573722F73686172652F666F72656D616E2F62696E2F7261696C7300736572766572002D2D656E7669726F6E6D656E740070726F64756374696F6E
# type=SYSCALL msg=audit(1613600004.938:2168): arch=c000003e syscall=83 success=no exit=-13 a0=4a60f20 a1=1ff a2=1d6ef30 a3=7ffcf4c8ef20 items=0 ppid=1 pid=12564 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="ruby" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600004.938:2168): avc:  denied  { write } for  pid=12564 comm="ruby" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0
# ----
# time->Wed Feb 17 22:14:22 2021
# type=PROCTITLE msg=audit(1613600062.834:2174): proctitle=2F6F70742F72682F72682D7275627932352F726F6F742F7573722F62696E2F72756279002F6F70742F746865666F72656D616E2F74666D2F726F6F742F7573722F62696E2F736964656B6971002D650070726F64756374696F6E002D72002F7573722F73686172652F666F72656D616E2F6578747261732F64796E666C6F772D
# type=SYSCALL msg=audit(1613600062.834:2174): arch=c000003e syscall=83 success=no exit=-13 a0=41ec610 a1=1ff a2=2237f30 a3=7ffee26be020 items=0 ppid=1 pid=12912 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="sidekiq" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600062.834:2174): avc:  denied  { write } for  pid=12912 comm="sidekiq" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0
# ----
# time->Wed Feb 17 22:14:22 2021
# type=PROCTITLE msg=audit(1613600062.834:2175): proctitle=2F6F70742F72682F72682D7275627932352F726F6F742F7573722F62696E2F72756279002F6F70742F746865666F72656D616E2F74666D2F726F6F742F7573722F62696E2F736964656B6971002D650070726F64756374696F6E002D72002F7573722F73686172652F666F72656D616E2F6578747261732F64796E666C6F772D
# type=SYSCALL msg=audit(1613600062.834:2175): arch=c000003e syscall=83 success=no exit=-13 a0=41ec610 a1=1ff a2=2237f30 a3=7ffee26bdde0 items=0 ppid=1 pid=12912 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="sidekiq" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600062.834:2175): avc:  denied  { write } for  pid=12912 comm="sidekiq" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0
# ----
# time->Wed Feb 17 22:14:47 2021
# type=PROCTITLE msg=audit(1613600087.785:2177): proctitle=2F6F70742F72682F72682D7275627932352F726F6F742F7573722F62696E2F72756279002F6F70742F746865666F72656D616E2F74666D2F726F6F742F7573722F62696E2F736964656B6971002D650070726F64756374696F6E002D72002F7573722F73686172652F666F72656D616E2F6578747261732F64796E666C6F772D
# type=SYSCALL msg=audit(1613600087.785:2177): arch=c000003e syscall=83 success=no exit=-13 a0=3ce4830 a1=1ff a2=199cf30 a3=7ffe6a74e460 items=0 ppid=1 pid=13017 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="sidekiq" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600087.785:2177): avc:  denied  { write } for  pid=13017 comm="sidekiq" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0
# ----
# time->Wed Feb 17 22:14:47 2021
# type=PROCTITLE msg=audit(1613600087.785:2178): proctitle=2F6F70742F72682F72682D7275627932352F726F6F742F7573722F62696E2F72756279002F6F70742F746865666F72656D616E2F74666D2F726F6F742F7573722F62696E2F736964656B6971002D650070726F64756374696F6E002D72002F7573722F73686172652F666F72656D616E2F6578747261732F64796E666C6F772D
# type=SYSCALL msg=audit(1613600087.785:2178): arch=c000003e syscall=83 success=no exit=-13 a0=3ce4830 a1=1ff a2=199cf30 a3=7ffe6a74e200 items=0 ppid=1 pid=13017 auid=4294967295 uid=996 gid=992 euid=996 suid=996 fsuid=996 egid=992 sgid=992 fsgid=992 tty=(none) ses=4294967295 comm="sidekiq" exe="/opt/rh/rh-ruby25/root/usr/bin/ruby" subj=system_u:system_r:foreman_rails_t:s0 key=(null)
# type=AVC msg=audit(1613600087.785:2178): avc:  denied  { write } for  pid=13017 comm="sidekiq" name="home" dev="vda1" ino=5441029 scontext=system_u:system_r:foreman_rails_t:s0 tcontext=unconfined_u:object_r:rpm_script_tmp_t:s0 tclass=dir permissive=0

This is due to:

In other words, probably something that played a role for a longer time but we never tested for. It was the result of a discussion between @evgeni, @ehelms and me.

evgeni · February 18, 2021, 7:28am

FWIW, those are present directly after installation, without any tests have run.

evgeni · February 18, 2021, 8:21am

# find / -context \*:rpm_script_tmp_t:s\* -name home
/tmp/bundler/home

I don’t know what /tmp/bundler is or why it tries to write there, tho…

It is present on other installs after a reboot too:

# ls /tmp/bundler/home/ -alhZ
drwxrwxrwx. foreman       foreman       system_u:object_r:system_cronjob_tmp_t:s0 .
drwxr-xr-x. foreman       foreman       system_u:object_r:system_cronjob_tmp_t:s0 ..
drwxr-xr-x. foreman       foreman       system_u:object_r:system_cronjob_tmp_t:s0 foreman
drwxr-xr-x. foreman-proxy foreman-proxy system_u:object_r:system_cronjob_tmp_t:s0 foreman-proxy
drwxr-xr-x. foreman       foreman       system_u:object_r:system_cronjob_tmp_t:s0 root

But now a different label…

Which brings me to

github.com

theforeman/foreman-selinux/blob/1bc001e8674f367f0b8174ddd108c6be6e6f1be0/foreman.te#L350-L354:


# When Foreman cronjob is started before Ruby on Rails, /tmp/bundler
# is created with system_u:object_r:system_cronjob_tmp_t:s0 label denying
# access to the web process
manage_files_pattern(foreman_rails_t, system_cronjob_tmp_t, system_cronjob_tmp_t)
manage_dirs_pattern(foreman_rails_t, system_cronjob_tmp_t, system_cronjob_tmp_t)

evgeni · February 18, 2021, 8:28am

And that again brings me to

Which indicates that bundle exec … creates those dirs, but they are actually not really needed…

evgeni · February 18, 2021, 8:34am

Oh, and there is an CVE for that by lzap :

https://bugzilla.redhat.com/show_bug.cgi?id=1651826

but it seems it remains unfixed in rh-ruby25 SCL and EL8

evgeni · February 18, 2021, 11:25am

I think the following would silence the denial

@lzap what do you think?

evgeni · February 18, 2021, 3:33pm

and just to close out the circle, Ewoud has disabled the check for now, so that it won’t affect pipelines and we can work on the solution:

system · February 25, 2021, 3:33pm

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