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test-execute: add no_new_privs tests for SystemCallFilter

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When starting a service with a non-root user and a SystemCallFilter and
other settings (like ProtectClock), the no_new_privs flag should not be set.

Also, test that CapabilityBoundingSet behaves correctly, since we need
to preserve some capabilities to do the seccomp filter and restore the
ones set by the service before executing.
This commit is contained in:
Iago López Galeiras 2023-09-20 11:40:47 +02:00
parent 24832d10b6
commit e720cebf7c
5 changed files with 50 additions and 0 deletions
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12
src/test/test-execute.c
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@ -754,6 +754,18 @@ static void test_exec_systemcallfilter(Manager *m) {
test(m, "exec-systemcallfilter-with-errno-in-allow-list.service", errno_from_name("EILSEQ"), CLD_EXITED);
test(m, "exec-systemcallfilter-override-error-action.service", SIGSYS, CLD_KILLED);
test(m, "exec-systemcallfilter-override-error-action2.service", errno_from_name("EILSEQ"), CLD_EXITED);
test(m, "exec-systemcallfilter-nonewprivileges.service", MANAGER_IS_SYSTEM(m) ? 0 : EXIT_GROUP, CLD_EXITED);
test(m, "exec-systemcallfilter-nonewprivileges-protectclock.service", MANAGER_IS_SYSTEM(m) ? 0 : EXIT_GROUP, CLD_EXITED);
r = find_executable("capsh", NULL);
if (r < 0) {
log_notice_errno(r, "Skipping %s, could not find capsh binary: %m", __func__);
return;
}
test(m, "exec-systemcallfilter-nonewprivileges-bounding1.service", MANAGER_IS_SYSTEM(m) ? 0 : EXIT_GROUP, CLD_EXITED);
test(m, "exec-systemcallfilter-nonewprivileges-bounding2.service", MANAGER_IS_SYSTEM(m) ? 0 : EXIT_GROUP, CLD_EXITED);
#endif
}

10
test/test-execute/exec-systemcallfilter-nonewprivileges-bounding1.service Normal file
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@ -0,0 +1,10 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
[Unit]
Description=Test bounding set is right with SystemCallFilter and non-root user
[Service]
ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "Bounding set "); test "$$c" = "Bounding set =cap_net_bind_service"'
Type=oneshot
User=1
SystemCallFilter=@system-service
CapabilityBoundingSet=CAP_NET_BIND_SERVICE

10
test/test-execute/exec-systemcallfilter-nonewprivileges-bounding2.service Normal file
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@ -0,0 +1,10 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
[Unit]
Description=Test bounding set is right with SystemCallFilter and non-root user
[Service]
ExecStart=/bin/sh -x -c 'c=$$(capsh --print | grep "Bounding set "); test "$$c" = "Bounding set =cap_setpcap,cap_net_bind_service,cap_sys_admin"'
Type=oneshot
User=1
SystemCallFilter=@system-service
CapabilityBoundingSet=CAP_SYS_ADMIN CAP_SETPCAP CAP_NET_BIND_SERVICE

9
test/test-execute/exec-systemcallfilter-nonewprivileges-protectclock.service Normal file
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@ -0,0 +1,9 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
[Unit]
Description=Test no_new_privs is unset for ProtectClock and non-root user
[Service]
ExecStart=/bin/sh -x -c 'c=$$(cat /proc/self/status | grep "NoNewPrivs: "); test "$$c" = "NoNewPrivs: 0"'
Type=oneshot
User=1
ProtectClock=yes

9
test/test-execute/exec-systemcallfilter-nonewprivileges.service Normal file
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@ -0,0 +1,9 @@
# SPDX-License-Identifier: LGPL-2.1-or-later
[Unit]
Description=Test no_new_privs is unset for SystemCallFilter and non-root user
[Service]
ExecStart=/bin/sh -x -c 'c=$$(cat /proc/self/status | grep "NoNewPrivs: "); test "$$c" = "NoNewPrivs: 0"'
Type=oneshot
User=1
SystemCallFilter=@system-service