Re: Diagnostic messages

[Daniel J Walsh <dwalsh@xxxxxxxxxx>]

Yes some how this got mislabeled.

On 10/27/2014 02:50 PM, Gian Luca Ortelli wrote:

Yes, I ran the restorecon command as you described  it ('restorecon -R -v ~/.pki') and things were fine again. So I guess my .pki settings were wrongly changed at some point in the past, right?

I'll keep the setsebool method for the next time chrome breaks, I'm afraid in a few updates.

Thanks,

  Gianluca Ortelli

On Mon, Oct 27, 2014 at 4:39 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

Did you run the restorecon command?

It looks like chrome is allowed to read files labeled home_cert_t but might be blocked form other types.

You could also turn off the chrome security using a boolean

setsebool -P unconfined_chrome_sandbox_transition 1

Which would do the equivalent of what you did in relabelling the executable to bin_t.

 

On 10/27/2014 04:07 AM, Gian Luca Ortelli wrote:

Hi,

my original fix was more coarse grained than this: I set the type of the chrome-sandbox to the generic SELinux executable (was it bin_t?).

Anyway, I tried your suggestion (a chrome update broke my fix several days ago, and I was back to 'setenforce 0' mode) and it also solves the problem.

Any ideas on why I don't get an explicit error message? Something like 'selinux is preventing chrome-sandbox from accessing .pki'? Or is the problem too indirect for selinux to figure out what's going wrong exactly?

Kind regards,

  Gianluca Ortelli

On Fri, Oct 24, 2014 at 7:22 PM, Daniel J Walsh <dwalsh@xxxxxxxxxx> wrote:

On 10/23/2014 02:28 AM, Gian Luca Ortelli wrote:

Hi,

I recently had to do some selinux tuning to have chrome correctly start on my fedora 20 box. I googled around and eventually found the correct type to apply to the chrome executable in order to make it work.

So the problem is solved, but the error messages that I got were much less informative than I expected. After watching https://www.youtube.com/watch?v=MxjenQ31b70 on selinux configuration, I was expecting messages in a format like "selinux is preventing X from access on directoy Y", but instead...

'journal -f' provided nothing useful; 'tail -f /var/log/audit/audit.log' showed a couple of log lines which actually mentioned chrome, but in too generic a manner (see below):

--------------------------------------

type=SYSCALL msg=audit(1413532031.170:387): arch=c000003e syscall=56 success=yes exit=2394 a0=60000011 a1=0 a2=0 a3=0 items=0 ppid=2382 pid=2393 auid=1000 uid=1000 gid=1000 euid=0 suid=0 fsuid=0 egid=1000 sgid=1000 fsgid=1000 tty=(none) ses=1 comm="chrome-sandbox" exe="/opt/google/chrome/chrome-sandbox" subj=unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c0.c1023 key=(null)

type=PROCTITLE msg=audit(1413532031.170:387): proctitle=2F6F70742F676F6F676C652F6368726F6D652F6368726F6D652D73616E64626F78002F6F70742F676F6F676C652F6368726F6D652F6368726F6D65002D2D747970653D7A79676F7465

type=ANOM_ABEND msg=audit(1413532031.195:388): auid=1000 uid=1000 gid=1000 ses=1 subj=unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c0.c1023 pid=2394 comm="chrome" exe="/opt/google/chrome/chrome" sig=11

--------------------------------------

Before I fixed the problem, launching google-chrome from command line resulted in an error message about the impossibility of creating directory .pki/nssdb in my home. No mention of this directory name in the audit.

And to finish, the SELinux troubleshooting tool didn't show anything at all.

Why don't I see a richer diagnostics? Am I missing some configuration?

Kind regards,

  Gianluca Ortelli

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What exactly did you do to fix the problem?  Did you have to fix the labels on .pki?  restorecon -R -v ~/.pki

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