#!/usr/bin/env bash # SPDX-License-Identifier: LGPL-2.1-or-later # shellcheck disable=SC2016 set -eux set -o pipefail # shellcheck source=test/units/util.sh . "$(dirname "$0")"/util.sh # Make sure the unit's exec context matches its configuration # See: https://github.com/systemd/systemd/pull/29552 # Even though hidepid= was introduced in kernel 3.3, we support only # the post 5.8 implementation that allows us to apply the option per-instance, # instead of the whole namespace. To distinguish between these two implementations # lets check if we can mount procfs with a named value (e.g. hidepid=off), since # support for this was introduced in the same commit as the per-instance stuff proc_supports_option() { local option="${1:?}" local proc_tmp ec proc_tmp="$(mktemp -d)" mount -t proc -o "$option" proc "$proc_tmp" && ec=0 || ec=$? mountpoint -q "$proc_tmp" && umount -q "$proc_tmp" rm -rf "$proc_tmp" return $ec } # In coverage builds we disable ProtectSystem= and ProtectHome= via a service.d # dropin in /etc. This dropin has, unfortunately, higher priority than # the transient stuff from systemd-run. Let's just skip the following tests # in that case instead of complicating the test setup even more */ if [[ -z "${COVERAGE_BUILD_DIR:-}" ]]; then if ! systemd-detect-virt -cq && command -v bootctl >/dev/null; then boot_path="$(bootctl --print-boot-path)" esp_path="$(bootctl --print-esp-path)" # If the mount points are handled by automount units, make sure we trigger # them before proceeding further ls -l "$boot_path" "$esp_path" fi systemd-run --wait --pipe -p ProtectSystem=yes \ bash -xec "test ! -w /usr; ${boot_path:+"test ! -w $boot_path; test ! -w $esp_path;"} test -w /etc; test -w /var" systemd-run --wait --pipe -p ProtectSystem=full \ bash -xec "test ! -w /usr; ${boot_path:+"test ! -w $boot_path; test ! -w $esp_path;"} test ! -w /etc; test -w /var" systemd-run --wait --pipe -p ProtectSystem=strict \ bash -xec "test ! -w /; test ! -w /etc; test ! -w /var; test -w /dev; test -w /proc" systemd-run --wait --pipe -p ProtectSystem=no \ bash -xec "test -w /; test -w /etc; test -w /var; test -w /dev; test -w /proc" MARK="$(mktemp /root/.exec-context.XXX)" systemd-run --wait --pipe -p ProtectHome=yes \ bash -xec "test ! -w /home; test ! -w /root; test ! -w /run/user; test ! -e $MARK" systemd-run --wait --pipe -p ProtectHome=read-only \ bash -xec "test ! -w /home; test ! -w /root; test ! -w /run/user; test -e $MARK" systemd-run --wait --pipe -p ProtectHome=tmpfs \ bash -xec "test -w /home; test -w /root; test -w /run/user; test ! -e $MARK" systemd-run --wait --pipe -p ProtectHome=no \ bash -xec "test -w /home; test -w /root; test -w /run/user; test -e $MARK" rm -f "$MARK" fi if proc_supports_option "hidepid=off"; then systemd-run --wait --pipe -p ProtectProc=noaccess -p User=testuser \ bash -xec 'test -e /proc/1; test ! -r /proc/1; test -r /proc/$$$$/comm' systemd-run --wait --pipe -p ProtectProc=invisible -p User=testuser \ bash -xec 'test ! -e /proc/1; test -r /proc/$$$$/comm' systemd-run --wait --pipe -p ProtectProc=ptraceable -p User=testuser \ bash -xec 'test ! -e /proc/1; test -r /proc/$$$$/comm' systemd-run --wait --pipe -p ProtectProc=ptraceable -p User=testuser -p AmbientCapabilities=CAP_SYS_PTRACE \ bash -xec 'test -r /proc/1; test -r /proc/$$$$/comm' systemd-run --wait --pipe -p ProtectProc=default -p User=testuser \ bash -xec 'test -r /proc/1; test -r /proc/$$$$/comm' fi if proc_supports_option "subset=pid"; then systemd-run --wait --pipe -p ProcSubset=pid -p User=testuser \ bash -xec "test -r /proc/1/comm; test ! -e /proc/cpuinfo" systemd-run --wait --pipe -p ProcSubset=all -p User=testuser \ bash -xec "test -r /proc/1/comm; test -r /proc/cpuinfo" fi if ! systemd-detect-virt -cq; then systemd-run --wait --pipe -p ProtectKernelLogs=yes -p User=testuser \ bash -xec "test ! -r /dev/kmsg" systemd-run --wait --pipe -p ProtectKernelLogs=no -p User=testuser \ bash -xec "test -r /dev/kmsg" fi systemd-run --wait --pipe -p BindPaths="/etc /home:/mnt:norbind -/foo/bar/baz:/usr:rbind" \ bash -xec "mountpoint /etc; test -d /etc/systemd; mountpoint /mnt; ! mountpoint /usr" systemd-run --wait --pipe -p BindReadOnlyPaths="/etc /home:/mnt:norbind -/foo/bar/baz:/usr:rbind" \ bash -xec "test ! -w /etc; test ! -w /mnt; ! mountpoint /usr" # Make sure we properly serialize/deserialize paths with spaces # See: https://github.com/systemd/systemd/issues/30747 touch "/tmp/test file with spaces" systemd-run --wait --pipe -p TemporaryFileSystem="/tmp" -p BindPaths="/etc /home:/mnt:norbind /tmp/test\ file\ with\ spaces" \ bash -xec "mountpoint /etc; test -d /etc/systemd; mountpoint /mnt; stat '/tmp/test file with spaces'" systemd-run --wait --pipe -p TemporaryFileSystem="/tmp" -p BindPaths="/etc /home:/mnt:norbind /tmp/test\ file\ with\ spaces:/tmp/destination\ wi\:th\ spaces" \ bash -xec "mountpoint /etc; test -d /etc/systemd; mountpoint /mnt; stat '/tmp/destination wi:th spaces'" # Check if we correctly serialize, deserialize, and set directives that # have more complex internal handling if ! systemd-detect-virt -cq; then # Funny detail: this originally used the underlying rootfs device, but that, # for some reason, caused "divide error" in kernel, followed by a kernel panic TEMPFILE="$(mktemp)" LODEV="$(losetup --show -f "$TEMPFILE")" ROOT_DEV_MAJ_MIN="$(lsblk -nro MAJ:MIN "$LODEV")" EXPECTED_IO_MAX="$ROOT_DEV_MAJ_MIN rbps=1000 wbps=1000000000000 riops=2000000000 wiops=4000" EXPECTED_IO_LATENCY="$ROOT_DEV_MAJ_MIN target=69000" SERVICE_NAME="test-io-directives-$RANDOM.service" CGROUP_PATH="/sys/fs/cgroup/system.slice/$SERVICE_NAME" # IO*= ARGUMENTS=( # Throw in a couple of invalid entries just to test things out -p IOReadBandwidthMax="/foo/bar 1M" -p IOReadBandwidthMax="/foo/baz 1M" -p IOReadBandwidthMax="$LODEV 1M" -p IOReadBandwidthMax="$LODEV 1K" -p IOWriteBandwidthMax="$LODEV 1G" -p IOWriteBandwidthMax="$LODEV 1T" -p IOReadIOPSMax="$LODEV 2G" -p IOWriteIOPSMax="$LODEV 4K" -p IODeviceLatencyTargetSec="$LODEV 666ms" -p IODeviceLatencyTargetSec="/foo/bar 69ms" -p IODeviceLatencyTargetSec="$LODEV 69ms" -p IOReadBandwidthMax="/foo/bar 1M" -p IOReadBandwidthMax="/foo/baz 1M" # TODO: IODeviceWeight= doesn't work on loop devices and virtual disks -p IODeviceWeight="$LODEV 999" -p IODeviceWeight="/foo/bar 999" ) systemctl set-property system.slice IOAccounting=yes # io.latency not available by default on Debian stable if [[ -e /sys/fs/cgroup/system.slice/io.latency ]]; then systemd-run --wait --pipe --unit "$SERVICE_NAME" "${ARGUMENTS[@]}" \ bash -xec "diff <(echo $EXPECTED_IO_MAX) $CGROUP_PATH/io.max; diff <(echo $EXPECTED_IO_LATENCY) $CGROUP_PATH/io.latency" fi # CPUScheduling= ARGUMENTS=( -p CPUSchedulingPolicy=rr # ID: 2 -p CPUSchedulingPolicy=fifo # ID: 1 -p CPUSchedulingPriority=5 # Actual prio: 94 (99 - prio) -p CPUSchedulingPriority=10 # Actual prio: 89 (99 - prio) ) systemd-run --wait --pipe --unit "$SERVICE_NAME" "${ARGUMENTS[@]}" \ bash -xec 'grep -E "^policy\s*:\s*1$" /proc/self/sched; grep -E "^prio\s*:\s*89$" /proc/self/sched' # Device*= ARGUMENTS=( -p DevicePolicy=closed -p DevicePolicy=strict -p DeviceAllow="char-mem rm" # Allow read & mknod for /dev/{null,zero,...} -p DeviceAllow="$LODEV rw" -p DeviceAllow="$LODEV w" # Allow write for the loop # Everything else should be disallowed per the strict policy ) systemd-run --wait --pipe --unit "$SERVICE_NAME" "${ARGUMENTS[@]}" \ bash -xec "test -r /dev/null; test ! -w /dev/null; test ! -r $LODEV; test -w $LODEV; test ! -r /dev/tty; test ! -w /dev/tty" if ! systemctl --version | grep -qF -- "-BPF_FRAMEWORK"; then # SocketBind*= ARGUMENTS=( -p SocketBindAllow= -p SocketBindAllow=1234 -p SocketBindAllow=ipv4:udp:any -p SocketBindAllow=ipv6:6666 # Everything but the last assignment is superfluous, but it still exercises # the parsing machinery -p SocketBindDeny= -p SocketBindDeny=1111 -p SocketBindDeny=ipv4:1111 -p SocketBindDeny=ipv4:any -p SocketBindDeny=ipv4:tcp:any -p SocketBindDeny=ipv4:udp:10000-11000 -p SocketBindDeny=ipv6:1111 -p SocketBindDeny=any ) # We should fail with EPERM when trying to bind to a socket not on the allow list # (nc exits with 2 in that case) systemd-run --wait -p SuccessExitStatus="1 2" --pipe "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -l 127.0.0.1 9999; exit 42' systemd-run --wait -p SuccessExitStatus="1 2" --pipe "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -l ::1 9999; exit 42' systemd-run --wait -p SuccessExitStatus="1 2" --pipe "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -6 -u -l ::1 9999; exit 42' systemd-run --wait -p SuccessExitStatus="1 2" --pipe "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -4 -l 127.0.0.1 6666; exit 42' systemd-run --wait -p SuccessExitStatus="1 2" --pipe -p SocketBindDeny=any \ bash -xec 'timeout 1s nc -l 127.0.0.1 9999; exit 42' # Consequently, we should succeed when binding to a socket on the allow list # and keep listening on it until we're killed by `timeout` (EC 124) systemd-run --wait --pipe -p SuccessExitStatus=124 "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -4 -l 127.0.0.1 1234; exit 1' systemd-run --wait --pipe -p SuccessExitStatus=124 "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -4 -u -l 127.0.0.1 5678; exit 1' systemd-run --wait --pipe -p SuccessExitStatus=124 "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -6 -l ::1 1234; exit 1' systemd-run --wait --pipe -p SuccessExitStatus=124 "${ARGUMENTS[@]}" \ bash -xec 'timeout 1s nc -6 -l ::1 6666; exit 1' fi losetup -d "$LODEV" rm -f "$TEMPFILE" fi # {Cache,Configuration,Logs,Runtime,State}Directory= ARGUMENTS=( -p CacheDirectory="foo/bar/baz also\ with\ spaces" -p CacheDirectory="foo" -p CacheDirectory="context" -p CacheDirectoryMode="0123" -p CacheDirectoryMode="0666" -p ConfigurationDirectory="context/foo also_context/bar context/nested/baz context/semi\:colon" -p ConfigurationDirectoryMode="0400" -p LogsDirectory="context/foo" -p LogsDirectory="" -p LogsDirectory="context/a/very/nested/logs/dir" -p RuntimeDirectory="context/with\ spaces" # Note: {Runtime,State,Cache,Logs}Directory= directives support the directory:symlink syntax, which # requires an additional level of escaping for the colon character -p RuntimeDirectory="also_context:a\ symlink\ with\ \\\:\ col\\\:ons\ and\ \ spaces" -p RuntimeDirectoryPreserve=yes -p StateDirectory="context" -p StateDirectory="./././././././context context context" -p StateDirectoryMode="0000" ) rm -rf /run/context systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec '[[ $CACHE_DIRECTORY == "/var/cache/also with spaces:/var/cache/context:/var/cache/foo:/var/cache/foo/bar/baz" ]]; [[ $(stat -c "%a" "${CACHE_DIRECTORY##*:}") == 666 ]]' systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec '[[ $CONFIGURATION_DIRECTORY == /etc/also_context/bar:/etc/context/foo:/etc/context/nested/baz:/etc/context/semi:colon ]]; [[ $(stat -c "%a" "${CONFIGURATION_DIRECTORY%%:*}") == 400 ]]' systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec '[[ $LOGS_DIRECTORY == /var/log/context/a/very/nested/logs/dir:/var/log/context/foo ]]; [[ $(stat -c "%a" "${LOGS_DIRECTORY##*:}") == 755 ]]' systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec '[[ $RUNTIME_DIRECTORY == "/run/also_context:/run/context/with spaces" ]]; [[ $(stat -c "%a" "${RUNTIME_DIRECTORY##*:}") == 755 ]]; [[ $(stat -c "%a" "${RUNTIME_DIRECTORY%%:*}") == 755 ]]' systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec '[[ $STATE_DIRECTORY == /var/lib/context ]]; [[ $(stat -c "%a" $STATE_DIRECTORY) == 0 ]]' test -d "/run/context/with spaces" test -s "/run/a symlink with : col:ons and spaces" rm -rf /var/{cache,lib,log}/context /etc/{also_,}context # Limit*= # # Note: keep limits of LimitDATA= and LimitAS= unlimited, otherwise ASan (LSan) # won't be able to mmap the shadow maps ARGUMENTS=( -p LimitCPU=15 -p LimitCPU=10:15 # ulimit -t -p LimitFSIZE=96G # ulimit -f -p LimitDATA=8T:infinity -p LimitDATA=infinity # ulimit -d -p LimitSTACK=8M # ulimit -s -p LimitCORE=infinity -p LimitCORE=17M # ulimit -c -p LimitRSS=27G # ulimit -m -p LimitNOFILE=7:127 # ulimit -n -p LimitAS=infinity # ulimit -v -p LimitNPROC=1 -p LimitNPROC=64:infinity # ulimit -u -p LimitMEMLOCK=37M # ulimit -l -p LimitLOCKS=19:1021 # ulimit -x -p LimitSIGPENDING=21 # ulimit -i -p LimitMSGQUEUE=666 # ulimit -q -p LimitNICE=4 # ulimit -e -p LimitRTPRIO=8 # ulimit -r -p LimitRTTIME=666666 # ulimit -R ) # Do all the checks in one giant inline shell blob to avoid the overhead of spawning # a new service for each check # # Note: ulimit shows storage-related values in 1024-byte increments* # Note2: ulimit -R requires bash >= 5.1 # # * in POSIX mode -c a -f options show values in 512-byte increments; let's hope # we never run in the POSIX mode systemd-run --wait --pipe "${ARGUMENTS[@]}" \ bash -xec 'KB=1; MB=$((KB * 1024)); GB=$((MB * 1024)); TB=$((GB * 1024)); : CPU; [[ $(ulimit -St) -eq 10 ]]; [[ $(ulimit -Ht) -eq 15 ]]; : FSIZE; [[ $(ulimit -Sf) -eq $((96 * GB)) ]]; [[ $(ulimit -Hf) -eq $((96 * GB)) ]]; : DATA; [[ $(ulimit -Sd) == unlimited ]]; [[ $(ulimit -Hd) == unlimited ]]; : STACK; [[ $(ulimit -Ss) -eq $((8 * MB)) ]]; [[ $(ulimit -Hs) -eq $((8 * MB)) ]]; : CORE; [[ $(ulimit -Sc) -eq $((17 * MB)) ]]; [[ $(ulimit -Hc) -eq $((17 * MB)) ]]; : RSS; [[ $(ulimit -Sm) -eq $((27 * GB)) ]]; [[ $(ulimit -Hm) -eq $((27 * GB)) ]]; : NOFILE; [[ $(ulimit -Sn) -eq 7 ]]; [[ $(ulimit -Hn) -eq 127 ]]; : AS; [[ $(ulimit -Sv) == unlimited ]]; [[ $(ulimit -Hv) == unlimited ]]; : NPROC; [[ $(ulimit -Su) -eq 64 ]]; [[ $(ulimit -Hu) == unlimited ]]; : MEMLOCK; [[ $(ulimit -Sl) -eq $((37 * MB)) ]]; [[ $(ulimit -Hl) -eq $((37 * MB)) ]]; : LOCKS; [[ $(ulimit -Sx) -eq 19 ]]; [[ $(ulimit -Hx) -eq 1021 ]]; : SIGPENDING; [[ $(ulimit -Si) -eq 21 ]]; [[ $(ulimit -Hi) -eq 21 ]]; : MSGQUEUE; [[ $(ulimit -Sq) -eq 666 ]]; [[ $(ulimit -Hq) -eq 666 ]]; : NICE; [[ $(ulimit -Se) -eq 4 ]]; [[ $(ulimit -He) -eq 4 ]]; : RTPRIO; [[ $(ulimit -Sr) -eq 8 ]]; [[ $(ulimit -Hr) -eq 8 ]]; ulimit -R || exit 0; : RTTIME; [[ $(ulimit -SR) -eq 666666 ]]; [[ $(ulimit -HR) -eq 666666 ]];' # RestrictFileSystems= # # Note: running instrumented binaries requires at least /proc to be accessible, so let's # skip the test when we're running under sanitizers # # Note: $GCOV_ERROR_LOG is used during coverage runs to suppress errors when creating *.gcda files, # since gcov can't access the restricted filesystem (as expected) if [[ ! -v ASAN_OPTIONS ]] && systemctl --version | grep "+BPF_FRAMEWORK" && kernel_supports_lsm bpf; then ROOTFS="$(df --output=fstype /usr/bin | sed --quiet 2p)" systemd-run --wait --pipe -p RestrictFileSystems="" ls / systemd-run --wait --pipe -p RestrictFileSystems="$ROOTFS foo bar" ls / (! systemd-run --wait --pipe -p RestrictFileSystems="$ROOTFS" ls /proc) (! systemd-run --wait --pipe -p GCOV_ERROR_LOG=/dev/null -p RestrictFileSystems="foo" ls /) systemd-run --wait --pipe -p RestrictFileSystems="$ROOTFS foo bar baz proc" ls /proc systemd-run --wait --pipe -p RestrictFileSystems="$ROOTFS @foo @basic-api" ls /proc systemd-run --wait --pipe -p RestrictFileSystems="$ROOTFS @foo @basic-api" ls /sys/fs/cgroup systemd-run --wait --pipe -p RestrictFileSystems="~" ls / systemd-run --wait --pipe -p RestrictFileSystems="~proc" ls / systemd-run --wait --pipe -p RestrictFileSystems="~@basic-api" ls / (! systemd-run --wait --pipe -p GCOV_ERROR_LOG=/dev/null -p RestrictFileSystems="~$ROOTFS" ls /) (! systemd-run --wait --pipe -p RestrictFileSystems="~proc" ls /proc) (! systemd-run --wait --pipe -p RestrictFileSystems="~@basic-api" ls /proc) (! systemd-run --wait --pipe -p RestrictFileSystems="~proc foo @bar @basic-api" ls /proc) (! systemd-run --wait --pipe -p RestrictFileSystems="~proc foo @bar @basic-api" ls /sys) systemd-run --wait --pipe -p RestrictFileSystems="~proc devtmpfs sysfs" ls / (! systemd-run --wait --pipe -p RestrictFileSystems="~proc devtmpfs sysfs" ls /proc) (! systemd-run --wait --pipe -p RestrictFileSystems="~proc devtmpfs sysfs" ls /dev) (! systemd-run --wait --pipe -p RestrictFileSystems="~proc devtmpfs sysfs" ls /sys) fi # Make sure we properly (de)serialize various string arrays, including whitespaces # See: https://github.com/systemd/systemd/issues/31214 systemd-run --wait --pipe -p Environment="FOO='bar4 '" \ bash -xec '[[ $FOO == "bar4 " ]]' systemd-run --wait --pipe -p Environment="FOO='bar4 ' BAR='\n\n'" \ bash -xec "[[ \$FOO == 'bar4 ' && \$BAR == $'\n\n' ]]" systemd-run --wait --pipe -p Environment='FOO="bar4 \\ "' -p Environment="BAR='\n\t'" \ bash -xec "[[ \$FOO == 'bar4 \\ ' && \$BAR == $'\n\t' ]]" TEST_ENV_FILE="/tmp/test-env-file-$RANDOM- " cat >"$TEST_ENV_FILE" <