Do you mean that we create our own new domain, e.g. myapp_t?
I tried this and it works for my a.out that reads test.txt.
I tried runcon as well for the Java version:
runcon system_u:object_r:myapp_t:SystemLow java Test
The response I got was: runcon: java: Permission denied.
In the audit.log I found that runcon is just not permitted for everything. Any thoughts?
...
type=SYSCALL msg=audit(1491323666.800:4249): arch=40000028 syscall=11 per=800000 success=no exit=-13 a0=7ec2c140 a1=7ec2c34c a2=7ec2c35c a3=6e69622f items=0 ppid=989 pid=10629 auid=1001 uid=1001 gid=1001 euid=1001 suid=1001 fsuid=1001 egid=1001 sgid=1001 fsgid=1001 tty=pts0 ses=3 comm="runcon" exe="/usr/bin/runcon" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1491323672.070:4255): avc: denied { execstack } for pid=10631 comm="runcon" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process permissive=0
type=SYSCALL msg=audit(1491323672.070:4255): arch=40000028 syscall=125 per=800000 success=no exit=-13 a0=7e84c000 a1=1000 a2=1000007 a3=76fb6f18 items=0 ppid=10630 pid=10631 auid=1001 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=3 comm="runcon" exe="/usr/bin/runcon" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1491323672.080:4256): avc: denied { transition } for pid=10631 comm="runcon" path="/usr/lib/jvm/java-8-openjdk-armhf/jre/bin/java" dev="mmcblk0p2" ino=524520 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:myapp_t:s0 tclass=process permissive=0
type=SYSCALL msg=audit(1491323672.080:4256): arch=40000028 syscall=11 per=800000 success=no exit=-13 a0=7e84c5dc a1=7e84c7ec a2=7e84c7f8 a3=6e69622f items=0 ppid=10630 pid=10631 auid=1001 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=3 comm="runcon" exe="/usr/bin/runcon" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1491323700.770:4269): avc: denied { transition } for pid=10636 comm="runcon" path="/usr/lib/jvm/java-8-openjdk-armhf/jre/bin/java" dev="mmcblk0p2" ino=524520 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=system_u:object_r:myapp_t:s0 tclass=process permissive=1
type=AVC msg=audit(1491323700.770:4269): avc: denied { entrypoint } for pid=10636 comm="runcon" path="/usr/lib/jvm/java-8-openjdk-armhf/jre/bin/java" dev="mmcblk0p2" ino=524520 scontext=system_u:object_r:myapp_t:s0 tcontext=system_u:object_r:java_exec_t:s0 tclass=file permissive=1
...
On Tue, Apr 4, 2017 at 9:26 AM, Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:
On Tue, 2017-04-04 at 08:50 -0700, Rahmadi Trimananda wrote:
> Hey Guys,
>
> I am trying to confine a Java process that I have so that it will be
> able to read only certain files. This is my experiment setup for my
> folder. Basically a.out (C program) and Test.class (Java class) are
> coded to read and print out the text in test.txt.
>
> unconfined_u:object_r:httpd_t:SystemLow a.out I think you are conflating file labels with process labels. The
> unconfined_u:object_r:user_home_t:SystemLow test.c
> unconfined_u:object_r:httpd_t:SystemLow Test.class
> unconfined_u:object_r:user_home_t:SystemLow Test.java
> unconfined_u:object_r:user_home_t:SystemLow test.txt
>
> I tried to change the type label for a.out from user_home_t to
> httpd_t just for the sake of the experiment. With this setup, a.out
> is no longer able to read test.txt in enforcing mode. However, I seem
> to not be able to do it for Test.class as it's running on a JVM. The
> java label is "bin_t". And I checked using this:
>
> sesearch -s bin_t -t user_home_t -c file -p read -Ad
>
> And it doesn't seem to have a rule that allows bin_t to read a file
> with user_home_t label.
>
> What's the right way to do this if any? Then, I also try to confine
> port accesses for Test.class, e.g. I only allow it to access ports
> 1234 and 2345. Same question, what's the right way to do this?
/usr/sbin/httpd file is labeled with the httpd_exec_t type; the running
httpd process runs in the httpd_t domain (to be precise, init_t
transitions to httpd_t upon executing httpd_exec_t). bin_t is just a
generally executable file type that doesn't cause a domain transition
(as no domain transition is defined in policy on it), so a process that
execs a bin_t file will just stay in its domain. You want to create a
new domain and run your program in that; if you are running it through
an interpreter, then you can force it into the target domain via
runcon.
Kind regards,
Rahmadi Trimananda
Ph.D. student @ University of California, Irvine
"Stay hungry, stay foolish!" - Steve Jobs -
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