Busybox udhcpc is unable to open an Internet socket in order to configure the network using DHCP when SELINUX=enforcing and SELINUXTYPE=strict. Reproducible: Always Steps to Reproduce: 1. Configure conf.d/net to use udhcpc for DHCP on an interface 2. Enable SELinux with SELINUX=enforcing and SELINUXTYPE=strict 3. Start the network Actual Results: udhcpc does not start and prints this message: udhcpc: socket(AF_INET,3,255): Permission denied These AVCs are logged: [84127.481667] type=1400 audit(1389405690.871:1920): avc: denied { create } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=rawip_socket [84127.481698] type=1400 audit(1389405690.871:1921): avc: denied { ioctl } for pid=17072 comm="busybox" path="socket:[1473741]" dev="sockfs" ino=1473741 scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=rawip_socket [84127.565118] type=1400 audit(1389405690.954:1922): avc: denied { create } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=packet_socket [84127.565145] type=1400 audit(1389405690.955:1923): avc: denied { bind } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=packet_socket [84127.570499] type=1400 audit(1389405690.960:1924): avc: denied { setopt } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=packet_socket [84127.576229] type=1400 audit(1389405690.966:1925): avc: denied { write } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=packet_socket [84128.581661] type=1400 audit(1389405691.971:1926): avc: denied { read } for pid=17072 comm="busybox" scontext=system_u:system_r:initrc_t tcontext=system_u:system_r:initrc_t tclass=packet_socket Expected Results: udhcpc should start and configure the network interface just like dhcpcd does. Portage 2.2.7 (hardened/linux/amd64/no-multilib/selinux, gcc-4.7.3, glibc-2.17, 3.11.7-hardened-r1 x86_64) ================================================================= System uname: Linux-3.11.7-hardened-r1-x86_64-QEMU_Virtual_CPU_version_1.5.3-with-gentoo-2.2 KiB Mem: 1020880 total, 645988 free KiB Swap: 0 total, 0 free Timestamp of tree: Fri, 10 Jan 2014 07:30:01 +0000 ld GNU ld (GNU Binutils) 2.23.2 app-shells/bash: 4.2_p45 dev-lang/python: 2.7.5-r3, 3.3.2-r2 dev-util/pkgconfig: 0.28 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.12.4 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.69 sys-devel/automake: 1.13.4 sys-devel/binutils: 2.23.2 sys-devel/gcc: 4.7.3-r1 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.2 sys-devel/make: 3.82-r4 sys-kernel/linux-headers: 3.9 (virtual/os-headers) sys-libs/glibc: 2.17 Repositories: gentoo ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=amdfam10 -mtune=amdfam10 -mcx16 -msahf -mpopcnt -mabm --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=512" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/sandbox.d /etc/terminfo" CXXFLAGS="-O2 -pipe -march=amdfam10 -mtune=amdfam10 -mcx16 -msahf -mpopcnt -mabm --param l1-cache-size=64 --param l1-cache-line-size=64 --param l2-cache-size=512" DISTDIR="/var/cache/portage/distfiles" EMERGE_DEFAULT_OPTS="--usepkg --jobs --load-average=3 --quiet-fail=y" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs buildpkg config-protect-if-modified distcc distcc-pump 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" GENTOO_MIRRORS="http://distfiles.gentoo.org" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j9" PKGDIR="/var/cache/portage/binpkgs/default-linux/amd64/amdfam10" PORTAGE_CONFIGROOT="/" 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" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/var/cache/portage/tree" PORTDIR_OVERLAY="" USE="3dnow 3dnowext amd64 bash-completion bzip2 caps cli cracklib crypt cxx dri filecaps hardened iconv ipv6 justify kerberos mmx mmxext modules mudflap ncurses nls nptl open_perms openmp pam pax_kernel pcre readline selinux session sse sse2 ssl tcpd unicode urandom 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" 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="keyboard mouse evdev" 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 ruby18" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" 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" Unset: CPPFLAGS, CTARGET, INSTALL_MASK, LANG, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, SYNC, USE_PYTHON
We need to have the busybox binary transition to the dhcpc_t domain. Does it use a separate binary or is it all symbolic links? Or a wrapper script?
If/when you can provide the info please re-open!
(In reply to Sven Vermeulen from comment #2) > If/when you can provide the info please re-open! Will do, sorry. I've switched my hardened machines to dhcpcd since it "just works" and I haven't had the opportunity to try out busybox again recently. I think netifrc calls "/bin/busybox udhcpc" but I am not positive. Busybox is a single, (usually) statically-linked executable that contains all of its commands. I'll try to get more info soon.
