Bug 1539416
| Summary: | ipsec service with seccomp support and selinux denials | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Ondrej Moriš <omoris> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED ERRATA | QA Contact: | Ondrej Moriš <omoris> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.5 | CC: | jreznik, lvrabec, mgrepl, mmalik, mthacker, omoris, plautrba, pwouters, ssekidde, tis |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.13.1-188.el7 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-10 12:49:36 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Paul Wouters noticed one interesting point - there is SELINUX_ERR event which is not really expected, right? Also, Paul suggested that the selinux policy has sysnet_domtrans_ifconfig(ipsec_t) which means ipsec_t should domtrans to ifconfig_t when running ip command and this domain transition in selinux doesn't work when seccomp is enabled for pluto (ipsec daemon). Ondrej Moris and me will test the fix as soon as the new build becomes available. Ondrej, Milos: if you create local policy proposed in description, is the scenario working? Thanks, Lukas. (In reply to Lukas Vrabec from comment #4) > if you create local policy proposed in description, is the scenario working? Yes. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0763 |
Description of problem: When seccomp filtering is enabled in ipsec service (ie. libreswan) and actual filtering happens (eg. during pluto seccomp selftest), service is restarted but some service actions are denied: ... 002 "test" #2: route-host output: /usr/libexec/ipsec/_updown.netkey: line 496: /usr/sbin/ip: Permission denied ... # ausearch -ts recent -m AVC type=PROCTITLE msg=audit(01/28/2018 20:24:31.687:956) : proctitle=/bin/sh /usr/libexec/ipsec/_updown.netkey type=SYSCALL msg=audit(01/28/2018 20:24:31.687:956) : arch=x86_64 syscall=execve success=no exit=EACCES(Permission denied) a0=0x14f5670 a1=0x14cae10 a2=0x14f8740 a3=0x7fff74ec99c0 items=0 ppid=25598 pid=25600 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=_updown.netkey exe=/usr/bin/bash subj=system_u:system_r:ipsec_t:s0 key=(null) type=AVC msg=audit(01/28/2018 20:24:31.687:956) : avc: denied { execute_no_trans } for pid=25600 comm=_updown.netkey path=/usr/sbin/ip dev="dm-0" ino=171957 scontext=system_u:system_r:ipsec_t:s0 tcontext=system_u:object_r:ifconfig_exec_t:s0 tclass=file type=SELINUX_ERR msg=audit(01/28/2018 20:24:31.687:956) : op=security_bounded_transition seresult=denied oldcontext=system_u:system_r:ipsec_t:s0 newcontext=system_u:system_r:ifconfig_t:s0 When the following rule is loaded into policy or selinux is in permissive mode, problem disappear: allow ipsec_t ifconfig_exec_t:file execute_no_trans; Version-Release number of selected component (if applicable): selinux-policy-3.13.1-166.el7.noarch libreswan-3.23-1.el7 kernel-3.10.0-693.el7 How reproducible: 100% Steps to Reproduce: Non-trivial but I can share if needed.