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Joined: 23 Feb 2015
Posts: 1

PostPosted: Wed Feb 25, 2015 4:37 am    Post subject: SELinux denials, init not loading in enforcing mode Reply with quote

Hi everybody,

I'm issuing painful SELinux denials on systemd (tested with openrc too, and the exact same thing happened, no trolls plz :lol: ) while in enforcing mode. It does not launch, and if I `setenforce 1` after systemd has completely loaded, I can't start/stop services, inter alia, due to permission denials.
I even tried to allow them by creating a policy module, but nothing changed (manually and via audit2allow).

Some info:
systemd is correctly linked to libselinux
id -Z fires correct security contexts
modules are "correctly loaded and enabled" (semodule -l)
I followed to the letter SELinux/Installation guide


# cat audit.log | head

type=DAEMON_START msg=audit(1424829806.362:7333): auditd start, ver=2.2.2 format=raw kernel=3.17.7-hardened-r1 auid=4294967295 pid=259 subj=system_u:system_r:init_t res=success
type=AVC msg=audit(1424829827.687:711): avc:  denied  { sendto } for  pid=192 comm="login" path="/run/systemd/journal/dev-log" scontext=system_u:system_r:local_login_t tcontext=system_u:system_r:init_t tclass=unix_dgram_socket permissive=1
type=AVC msg=audit(1424829827.687:712): avc:  denied  { net_admin } for  pid=192 comm="login" capability=12  scontext=system_u:system_r:local_login_t tcontext=system_u:system_r:local_login_t tclass=capability permissive=1
type=AVC msg=audit(1424829827.687:713): avc:  denied  { connectto } for  pid=192 comm="login" path="/run/dbus/system_bus_socket" scontext=system_u:system_r:local_login_t tcontext=system_u:system_r:init_t tclass=unix_stream_socket permissive=1
type=AVC msg=audit(1424829827.687:714): avc:  denied  { read } for  pid=110 comm="systemd-journal" name="exe" dev="proc" ino=6844 scontext=system_u:system_r:init_t tcontext=system_u:system_r:local_login_t tclass=lnk_file permissive=1
type=AVC msg=audit(1424829827.688:715): avc:  denied  { nlmsg_relay } for  pid=182 comm="dbus-daemon" scontext=system_u:system_r:init_t tcontext=system_u:system_r:init_t tclass=netlink_audit_socket permissive=1
type=USER_AVC msg=audit(1424829827.688:716): pid=182 uid=108 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t msg='avc:  denied  { send_msg } for msgtype=method_call interface=org.freedesktop.DBus member=Hello dest=org.freedesktop.DBus spid=192 scontext=system_u:system_r:local_login_t tcontext=system_u:system_r:init_t tclass=dbus  exe="/usr/bin/dbus-daemon" sauid=108 hostname=? addr=? terminal=?'
type=USER_AVC msg=audit(1424829827.691:717): pid=182 uid=108 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t msg='avc:  denied  { send_msg } for msgtype=method_return dest=:1.5 spid=181 tpid=192 scontext=system_u:system_r:init_t tcontext=system_u:system_r:local_login_t tclass=dbus  exe="/usr/bin/dbus-daemon" sauid=108 hostname=? addr=? terminal=?'
type=AVC msg=audit(1424829827.693:718): avc:  denied  { unlink } for  pid=181 comm="systemd-logind" name="2.ref" dev="tmpfs" ino=6861 scontext=system_u:system_r:init_t tcontext=system_u:object_r:init_var_run_t tclass=fifo_file permissive=1
type=AVC msg=audit(1424829827.694:719): avc:  denied  { execute_no_trans } for  pid=270 comm="kworker/u4:2" path="/usr/lib64/systemd/systemd-cgroups-agent" dev="sda4" ino=370451 scontext=system_u:system_r:kernel_t tcontext=system_u:object_r:lib_t tclass=file permissive=1

full audit log here :

I'll update the post with system info and config.
I hope that's not a stupid mistake :oops:

Thank you for reading.

# emerge --info

Portage 2.2.14 (python 2.7.9-final-0, hardened/linux/amd64/no-multilib/selinux, gcc-4.9.2, glibc-2.19-r1, 3.17.7-hardened-r1 x86_64)
System uname: Linux-3.17.7-hardened-r1-x86_64-Intel-R-_Core-TM-2_Duo_CPU_P8600_@_2.40GHz-with-gentoo-2.2
KiB Mem:     3776604 total,   3047276 free
KiB Swap:    4296700 total,   4296700 free
Timestamp of tree: Tue, 24 Feb 2015 20:45:01 +0000
ld GNU ld (Gentoo 2.24 p1.4) 2.24
app-shells/bash:          4.2_p53
dev-lang/perl:            5.20.1-r4
dev-lang/python:          2.7.9-r1, 3.3.5-r1
dev-util/pkgconfig:       0.28-r1
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.13.11
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.69
sys-devel/automake:       1.13.4
sys-devel/binutils:       2.24-r3
sys-devel/gcc:            4.9.2
sys-devel/gcc-config:     1.7.3
sys-devel/libtool:        2.4.4
sys-devel/make:           4.0-r1
sys-kernel/linux-headers: 3.16 (virtual/os-headers)
sys-libs/glibc:           2.19-r1
Repositories: gentoo
CFLAGS="-O2 -pipe -march=native -fomit-frame-pointer"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-O2 -pipe -march=native -fomit-frame-pointer"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox selinux sesandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
USE="acl amd64 berkdb bzip2 cli cracklib crypt cxx dri fortran gdbm hardened iconv ipv6 justify libav mmx modules ncurses networkmanager nls nptl open_perms openmp pam pax_kernel pcre peer_perms readline selinux session sse sse2 ssl systemd tcpd ubac unconfined unicode urandom xattr xtpax zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx sse sse2 sse3 ssse3 sse4 sse4a sse4_1" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="nouveau" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"

# id -Z

While loading the audit2allow generated policy :
# semodule -i locpol.pp
libsepol.check_assertion_helper: neverallow violated by allow kernel_t kernel_t:process { setcurrent }; <-- this should allow systemd to load...
libsemanage.semanage_expand_sandbox: Expand module failed
semodule:  Failed!
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