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Description of problem:
When running OpenShift 3.10 the SDN component handles DNS and that has been moved into a privileged pod. The SDN pod sends dbus messages to tell dnsmasq to change the servers it talks to. And then it watches for the dnsmasq UP messages to reprogram it when it restarts.
I watched the dbus messages with:
dbus-monitor --monitor --address unix:path=/var/run/dbus/system_bus_socket
And see that the messages sent by the pod work, but the replies and broadcast UP messages are forbidden by selinux policy.
Version-Release number of selected component (if applicable):
RHEL 7.5
How reproducible:
100%
Steps to Reproduce:
1. Install and run OpenShift 3.10 on a 7.5 machine
2. dig kubernetes.default.svc.cluster.local.
3. systemctl restart dnsmasq
4. dig kubernetes.default.svc.cluster.local.
Actual results:
Step 4 returns no address.
Expected results:
Step 4 returns the same address as step 1.
Additional info:
# ausearch -m USER_AVC
...
type=USER_AVC msg=audit(1528917015.293:21021): pid=578 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for msgtype=signal interface=uk.org.thekelleys.dnsmasq member=Up dest=org.freedesktop.DBus spid=29545 tpid=22466 scontext=system_u:system_r:dnsmasq_t:s0 tcontext=system_u:system_r:spc_t:s0 tclass=dbus exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
...
type=USER_AVC msg=audit(1528920265.551:22681): pid=578 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for msgtype=method_return dest=:1.523 spid=29545 tpid=25068 scontext=system_u:system_r:dnsmasq_t:s0 tcontext=system_u:system_r:spc_t:s0 tclass=dbus exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
I tried:
# audit2allow -R -m local > local.te; make -f /usr/share/selinux/devel/Makefile local.pp; semodule -i local.pp
And the module loaded... but the problem was not solved.
Lukas the problem here is the dnsmasq_t is not in a system_debus.
dbus_system_domain(dnsmasq_t, system_r)
Should be added to upstream policy so that this would be allowed.
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-2018:2036
Description of problem: When running OpenShift 3.10 the SDN component handles DNS and that has been moved into a privileged pod. The SDN pod sends dbus messages to tell dnsmasq to change the servers it talks to. And then it watches for the dnsmasq UP messages to reprogram it when it restarts. I watched the dbus messages with: dbus-monitor --monitor --address unix:path=/var/run/dbus/system_bus_socket And see that the messages sent by the pod work, but the replies and broadcast UP messages are forbidden by selinux policy. Version-Release number of selected component (if applicable): RHEL 7.5 How reproducible: 100% Steps to Reproduce: 1. Install and run OpenShift 3.10 on a 7.5 machine 2. dig kubernetes.default.svc.cluster.local. 3. systemctl restart dnsmasq 4. dig kubernetes.default.svc.cluster.local. Actual results: Step 4 returns no address. Expected results: Step 4 returns the same address as step 1. Additional info: # ausearch -m USER_AVC ... type=USER_AVC msg=audit(1528917015.293:21021): pid=578 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for msgtype=signal interface=uk.org.thekelleys.dnsmasq member=Up dest=org.freedesktop.DBus spid=29545 tpid=22466 scontext=system_u:system_r:dnsmasq_t:s0 tcontext=system_u:system_r:spc_t:s0 tclass=dbus exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?' ... type=USER_AVC msg=audit(1528920265.551:22681): pid=578 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc: denied { send_msg } for msgtype=method_return dest=:1.523 spid=29545 tpid=25068 scontext=system_u:system_r:dnsmasq_t:s0 tcontext=system_u:system_r:spc_t:s0 tclass=dbus exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?' I tried: # audit2allow -R -m local > local.te; make -f /usr/share/selinux/devel/Makefile local.pp; semodule -i local.pp And the module loaded... but the problem was not solved.