| Summary: | sudo -r ... cannot read /etc/selinux/targeted/contexts/default_type | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Milos Malik <mmalik> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED ERRATA | QA Contact: | Karel Srot <ksrot> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 6.1 | CC: | dwalsh, ksrot, mgrepl |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.7.19-87.el6 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-05-19 12:27:48 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
Did yo try to allow staff_sudo_t to read default_context_t type? Steps 5 and 6 described in comment#0 lead to 4 AVCs in enforcing mode. "Actual results" section shows the unique ones. Following module solved my problem. I don't see any AVCs in enforcing mode when running the automated test.
module mypol 1.0;
require {
type devpts_t;
type default_context_t;
type staff_sudo_t;
class file { read getattr open };
class filesystem getattr;
}
#============= staff_sudo_t ==============
allow staff_sudo_t default_context_t:file { read getattr open };
allow staff_sudo_t devpts_t:filesystem getattr;
Looks good to me. I will add. It works also for me. Fixed in selinux-policy-3.7.19-87.el6 An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-0526.html |
Description of problem: Version-Release number of selected component (if applicable): selinux-policy-minimum-3.7.19-85.el6.noarch selinux-policy-doc-3.7.19-85.el6.noarch selinux-policy-targeted-3.7.19-85.el6.noarch selinux-policy-3.7.19-85.el6.noarch selinux-policy-mls-3.7.19-85.el6.noarch How reproducible: always Steps to Reproduce: 1) create an staff_u user 2) set a password for the user 3) allow the user to run w via sudo ( echo "USERNAME ALL = (ALL) /usr/bin/w" >> /etc/sudoers ) 4) log in as the user (works in both SSH session and X session) 5) run "sudo -r unconfined_r w" (role change from staff_r to unconfined_r is allowed) $ sudo -r unconfined_r w [sudo] password for sudotester: sudo: unable to get default type for role unconfined_r sudo: unable to execute /usr/bin/w: Invalid argument 6) run "sudo -r guest_r w" (role change from staff_r to guest_r is not allowed) $ sudo -r guest_r w [sudo] password for sudotester: sudo: unable to get default type for role guest_r sudo: unable to execute /usr/bin/w: Invalid argument Actual results: ---- time->Tue Apr 19 06:55:05 2011 type=SYSCALL msg=audit(1303210505.672:41918): arch=c000003e syscall=137 success=no exit=-13 a0=7fcd0ce368d0 a1=7fff5ac75d40 a2=7fff5ac75cb0 a3=7fff5ac75a10 items=0 ppid=4800 pid=4821 auid=501 uid=0 gid=502 euid=0 suid=0 fsuid=0 egid=502 sgid=502 fsgid=502 tty=pts2 ses=32 comm="sudo" exe="/usr/bin/sudo" subj=staff_u:staff_r:staff_sudo_t:s0 key=(null) type=AVC msg=audit(1303210505.672:41918): avc: denied { getattr } for pid=4821 comm="sudo" name="/" dev=devpts ino=1 scontext=staff_u:staff_r:staff_sudo_t:s0 tcontext=system_u:object_r:devpts_t:s0 tclass=filesystem ---- time->Tue Apr 19 06:55:05 2011 type=SYSCALL msg=audit(1303210505.752:41922): arch=c000003e syscall=2 success=no exit=-13 a0=7fcd0ce54d80 a1=0 a2=1b6 a3=0 items=0 ppid=4821 pid=4825 auid=501 uid=0 gid=502 euid=0 suid=0 fsuid=0 egid=502 sgid=502 fsgid=502 tty=pts2 ses=32 comm="sudo" exe="/usr/bin/sudo" subj=staff_u:staff_r:staff_sudo_t:s0 key=(null) type=AVC msg=audit(1303210505.752:41922): avc: denied { read } for pid=4825 comm="sudo" name="default_type" dev=dm-0 ino=132104 scontext=staff_u:staff_r:staff_sudo_t:s0 tcontext=system_u:object_r:default_context_t:s0 tclass=file ---- Expected results: no AVCs