Bug 1584632
| Summary: | Add nss_systemd support to auth_use_nsswitch() | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Dridi Boukelmoune <dridi.boukelmoune> |
| Component: | selinux-policy | Assignee: | Lukas Vrabec <lvrabec> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 28 | CC: | dac.override, dwalsh, lvrabec, mgrepl, mmalik, plautrba, pmoore |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-3.14.2-22.fc29 selinux-policy-3.14.1-32.fc28 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-06-09 20:42:31 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: | |||
Those avc denials are incomplete. This is the other half:
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time->Thu May 31 12:11:29 2018
type=USER_AVC msg=audit(1527761489.202:408): pid=1129 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_call interface=org.freedesktop.DBus member=Hello dest=org.freedesktop.DBus spid=17093 scontext=system_u:system_r:varnishd_t:s0 tcontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tclass=dbus permissive=1 exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
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time->Thu May 31 12:11:29 2018
type=USER_AVC msg=audit(1527761489.203:409): pid=1129 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_call interface=org.freedesktop.systemd1.Manager member=LookupDynamicUserByName dest=org.freedesktop.systemd1 spid=17093 tpid=1 scontext=system_u:system_r:varnishd_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=dbus permissive=1 exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
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time->Thu May 31 12:11:29 2018
type=USER_AVC msg=audit(1527761489.203:410): pid=1129 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=error error_name=org.freedesktop.systemd1.NoSuchDynamicUser dest=:1.94 spid=1 tpid=17093 scontext=system_u:system_r:init_t:s0 tcontext=system_u:system_r:varnishd_t:s0 tclass=dbus permissive=1 exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
selinux-policy-3.14.1-32.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-743a9247de selinux-policy-3.14.1-32.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-743a9247de selinux-policy-3.14.1-32.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report. |
Description of problem: I observed it with varnish: by default it stalls in enforcing mode when the service is started. Depending on your nsswitch configuration calling getpwnam(3) may result in a systemd dynamic user lookup that gets denied. Adding this support entails chatting with systemd --system over the dbus --system bus and getting attributes of /etc/systemd/dont-synthesize-nobody if the user configured nsswitch.conf as such. Version-Release number of selected component (if applicable): $ rpm -qa selinux-policy selinux-policy-3.14.1-29.fc28.noarch How reproducible: always Steps to Reproduce: # grep systemd /etc/nsswitch.conf passwd: systemd files shadow: systemd files group: systemd files # setenforce 1 # time systemctl start varnish real 1m0.325s user 0m0.008s sys 0m0.012s # ausearch -m avc,user_avc,selinux_err -ts recent ---- time->Thu May 31 12:35:38 2018 type=USER_AVC msg=audit(1527762938.621:422): pid=1129 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_call interface=org.freedesktop.DBus member=Hello dest=org.freedesktop.DBus spid=18001 scontext=system_u:system_r:varnishd_t:s0 tcontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tclass=dbus permissive=0 exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?' ---- time->Thu May 31 12:36:08 2018 type=USER_AVC msg=audit(1527762968.625:423): pid=1129 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_call interface=org.freedesktop.DBus member=Hello dest=org.freedesktop.DBus spid=18001 scontext=system_u:system_r:varnishd_t:s0 tcontext=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 tclass=dbus permissive=0 exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?' Actual results: A denial leaving the process calling getpwnam or getgrnam hanging. Expected results: No denial as the process is not explicitly sending the DBus messages. Additional info: Diagnosed with the help of Dominick Grift. I initially thought I was doing something wrong months ago and had removed "systemd" and "nss" entries in my nsswitch.conf file since I don't need them on my workstation.