Bug 834900 - Selinux prevents boinc client from reading log file
Summary: Selinux prevents boinc client from reading log file
Alias: None
Product: Fedora
Classification: Fedora
Component: boinc-client
Version: 17
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Milos Jakubicek
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2012-06-24 18:01 UTC by John Horne
Modified: 2012-07-11 23:56 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-07-11 23:56:15 UTC

Attachments (Terms of Use)
Selinux error msg (2.47 KB, application/octet-stream)
2012-06-24 18:01 UTC, John Horne
no flags Details

Description John Horne 2012-06-24 18:01:26 UTC
Created attachment 594032 [details]
Selinux error msg

Description of problem:
Boinc has two log files in /var/log which are accessed via symbolic links in /var/lib/boinc. Selinux seems to be preventing the boinc client read access to those log files.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. start boinc using 'systemctl start boinc-client.service'
2. monitor /var/log/audit/audit.log file
Actual results:
Attachments have the selinux details

Expected results:
Boinc should start up with no selinux problems

Additional info:
There are two log files involved:

cd /var/lib/boinc
ls -l std*
lrwxrwxrwx. 1 boinc boinc 21 Jun 23 13:50 stderrdae.txt -> /var/log/boincerr.log
lrwxrwxrwx. 1 boinc boinc 18 Jun 23 13:50 stdoutdae.txt -> /var/log/boinc.log
ls -lL std*
-rw-r--r--. 1 boinc boinc     0 Jun 23 14:05 stderrdae.txt
-rw-r--r--. 1 boinc boinc 50961 Jun 24 18:44 stdoutdae.txt

Comment 1 Milos Jakubicek 2012-06-24 18:13:20 UTC
Thanks for spotting that, I will fix that asap.

Comment 2 Milos Jakubicek 2012-06-26 13:18:00 UTC
That's strange, I reverted that change and redirect the output of boinc from a wrapper script around, which is sort of what was the case with SysVInit, but I still get an AVC denied writing to file (not a symlink anymore!):

SELinux is preventing /usr/bin/bash from open access on the file /var/log/boinc.log.

*****  Plugin catchall (100. confidence) suggests  ***************************

If you believe that bash should be allowed open access on the boinc.log file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
allow this access for now by executing:
# grep boinc /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:boinc_t:s0
Target Context                system_u:object_r:var_log_t:s0
Target Objects                /var/log/boinc.log [ file ]
Source                        boinc
Source Path                   /usr/bin/bash
Port                          <Neznámé>
Host                          ioel
Source RPM Packages           bash-4.2.29-1.fc17.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.10.0-132.fc17.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     ioel
Platform                      Linux ioel 3.4.3-1.fc17.x86_64 #1 SMP Mon Jun 18
                              19:53:17 UTC 2012 x86_64 x86_64
Alert Count                   1
First Seen                    Út 26. červen 2012, 15:14:28 CEST
Last Seen                     Út 26. červen 2012, 15:14:28 CEST
Local ID                      17a578f7-984e-44f7-b9af-18a0d864b0c5

Raw Audit Messages
type=AVC msg=audit(1340716468.5:755): avc:  denied  { open } for  pid=5793 comm="boinc" name="boinc.log" dev="dm-1" ino=1311162 scontext=system_u:system_r:boinc_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=file

type=SYSCALL msg=audit(1340716468.5:755): arch=x86_64 syscall=open success=no exit=EACCES a0=1f0e4a0 a1=401 a2=1b6 a3=13 items=0 ppid=5792 pid=5793 auid=4294967295 uid=104 gid=103 euid=104 suid=104 fsuid=104 egid=103 sgid=103 fsgid=103 tty=(none) ses=4294967295 comm=boinc exe=/usr/bin/bash subj=system_u:system_r:boinc_t:s0 key=(null)

Hash: boinc,boinc_t,var_log_t,file,open

audit2allowunable to open /sys/fs/selinux/policy:  Permission denied

audit2allow -Runable to open /sys/fs/selinux/policy:  Permission denied

CC'ing SELinux maintainers, were there any changes in handling SELinux access to  /var/log files between F16 and F17? Or is it because of the SysVInit->systemd transition? You can have a look at a preliminary version here:

Comment 3 Miroslav Grepl 2012-06-27 05:32:15 UTC
We don't have boinc log in the policy.

Comment 4 Miroslav Grepl 2012-06-27 05:35:58 UTC
Fixed in selinux-policy-3.10.0-134.fc17.noarch

Comment 5 Miroslav Grepl 2012-06-27 05:43:23 UTC
I also adde support for systemd.

Comment 6 Milos Jakubicek 2012-06-27 15:38:56 UTC
Miroslav, are you sure it is selinux-policy-3.10.0-134.fc17 and not selinux-policy-3.11.0-7.fc18?

Comment 7 Miroslav Grepl 2012-06-28 11:22:42 UTC
# git log f17

commit 880755276bfbc0a0ff0cc33c5685e0a195cccb6c
Author: Miroslav Grepl <mgrepl@redhat.com>
Date:   Wed Jun 27 07:50:56 2012 +0200

    Allow boinc domains to manage boinc_lib_t lnk_files

commit b1f69176de44a8ce2d7fb00ae5ff89aa9f63f525
Author: Miroslav Grepl <mgrepl@redhat.com>
Date:   Wed Jun 27 07:41:46 2012 +0200

    Add support for boinc-client.service unit file

commit eca1500482e8f221304c9c424a275a658ba0f219
Author: Miroslav Grepl <mgrepl@redhat.com>
Date:   Wed Jun 27 07:35:06 2012 +0200

    add support for boinc.log

So it has been added to F17 too.

Comment 8 Milos Jakubicek 2012-06-28 13:24:09 UTC
Well, just checked out selinux-policy in git:

>git log f17 | grep "Allow boinc"
    - Allow boinc to read passwd
    - Allow boinc projects to gconf config files
    - Allow boinc project to getattr on fs
    - Allow boinc_project to use shm
    Allow boinc_project to use shm
    Allow boinc projects to execute java

So you did not push that and it is not part of selinux-policy-3.10.0-134.fc17 -- right?

Comment 9 Miroslav Grepl 2012-06-28 13:36:18 UTC
Ah, I apologize .. I wanted to wrote

Fixed in selinux-policy-3.10.0-135.fc17.noarch

Comment 10 Milos Jakubicek 2012-06-28 14:07:05 UTC
Great, right -- thanks for a fast response!

Comment 11 Fedora Update System 2012-07-10 07:28:51 UTC
boinc-client-7.0.29-1.r25790svn.fc17 has been submitted as an update for Fedora 17.

Comment 12 Fedora Update System 2012-07-11 23:56:15 UTC
boinc-client-7.0.29-1.r25790svn.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

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