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#!/bin/env python3
# crun - OCI runtime written in C
#
# Copyright (C) 2017, 2018, 2019 Giuseppe Scrivano <giuseppe@scrivano.org>
# crun is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# crun is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with crun. If not, see <http://www.gnu.org/licenses/>.
import json
import os
import shutil
import sys
from tests_utils import *
def test_no_caps():
conf = base_config()
conf['process']['args'] = ['/init', 'cat', '/proc/self/status']
add_all_namespaces(conf)
conf['process']['capabilities'] = {}
for i in ['bounding', 'effective', 'inheritable', 'permitted', 'ambient']:
conf['process']['capabilities'][i] = []
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
for i in ['CapInh', 'CapPrm', 'CapEff', 'CapBnd', 'CapAmb']:
if proc_status.get(i, '') != "0000000000000000":
actual = proc_status.get(i, 'MISSING')
logger.info("%s capability check failed: expected '0000000000000000', got '%s'", i, actual)
return -1
return 0
def test_some_caps():
conf = base_config()
conf['process']['args'] = ['/init', 'cat', '/proc/self/status']
add_all_namespaces(conf)
conf['process']['capabilities'] = {}
for i in ['bounding', 'effective', 'inheritable', 'permitted', 'ambient']:
conf['process']['capabilities'][i] = []
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
for i in ['CapInh', 'CapPrm', 'CapEff', 'CapBnd', 'CapAmb']:
if proc_status.get(i, '') != "0000000000000000":
actual = proc_status.get(i, 'MISSING')
logger.info("%s capability check failed: expected '0000000000000000', got '%s'", i, actual)
return -1
return 0
def test_unknown_caps():
conf = base_config()
conf['process']['args'] = ['/init', 'cat', '/proc/self/status']
add_all_namespaces(conf)
conf['process']['capabilities'] = {}
# unknown caps must be ignored
for i in ['bounding', 'effective', 'inheritable', 'permitted', 'ambient']:
conf['process']['capabilities'][i] = ['CAP_UNKNOWN', 'UNKNOWN_CAP']
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
for i in ['CapInh', 'CapPrm', 'CapEff', 'CapBnd', 'CapAmb']:
if proc_status.get(i, '') != "0000000000000000":
actual = proc_status.get(i, 'MISSING')
logger.info("%s capability check failed (unknown caps should be ignored): expected '0000000000000000', got '%s'", i, actual)
return -1
return 0
def test_new_privs():
conf = base_config()
conf['process']['args'] = ['/init', 'cat', '/proc/self/status']
add_all_namespaces(conf)
conf['process']['noNewPrivileges'] = True
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
no_new_privs = proc_status.get('NoNewPrivs', 'MISSING')
if no_new_privs != "1":
logger.info("noNewPrivileges=true test failed: expected '1', got '%s'", no_new_privs)
return -1
with open("/proc/self/status") as f:
host_proc_status = parse_proc_status(f.read())
host_no_new_privs = host_proc_status.get('NoNewPrivs', '0')
# if nonewprivs is already set, it cannot be unset, so skip the
# next test
if host_no_new_privs == "1":
return (77, "host already has NoNewPrivs=1")
conf['process']['noNewPrivileges'] = False
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
no_new_privs = proc_status.get('NoNewPrivs', 'MISSING')
if no_new_privs != "0":
logger.info("noNewPrivileges=false test failed: expected '0', got '%s'", no_new_privs)
return -1
return 0
def helper_test_some_caps(uid, captypes, proc_name):
conf = base_config()
conf['process']['args'] = ['/init', 'cat', '/proc/self/status']
add_all_namespaces(conf)
conf['process']['user']['uid'] = uid
conf['process']['capabilities'] = {}
for i in captypes + ['bounding']:
conf['process']['capabilities'][i] = ["CAP_SYS_ADMIN"]
out, _ = run_and_get_output(conf, hide_stderr=True)
proc_status = parse_proc_status(out)
expected = "0000000000200000"
actual = proc_status.get(proc_name, 'MISSING')
if actual != expected:
logger.info("%s capability check failed for uid %d with caps %s: expected '%s', got '%s'",
proc_name, uid, captypes, expected, actual)
return -1
return 0
def test_some_caps_bounding():
return helper_test_some_caps(0, ["bounding"], 'CapBnd')
def test_some_caps_inheritable():
return helper_test_some_caps(0, ["inheritable"], 'CapInh')
def test_some_caps_ambient():
return helper_test_some_caps(0, ["ambient", "permitted", "inheritable"], 'CapAmb')
def test_some_caps_permitted():
return helper_test_some_caps(0, ["permitted"], 'CapPrm')
def test_some_caps_effective_non_root():
if is_rootless():
return (77, "requires root privileges")
return helper_test_some_caps(1000, ["effective", "permitted", "inheritable", "ambient"], 'CapEff')
def test_some_caps_bounding_non_root():
if is_rootless():
return (77, "requires root privileges")
return helper_test_some_caps(1000, ["bounding"], 'CapBnd')
def test_some_caps_inheritable_non_root():
if is_rootless():
return (77, "requires root privileges")
return helper_test_some_caps(1000, ["inheritable"], 'CapInh')
def test_some_caps_ambient_non_root():
if is_rootless():
return (77, "requires root privileges")
return helper_test_some_caps(1000, ["ambient", "permitted", "inheritable"], 'CapAmb')
def test_some_caps_permitted_non_root():
if is_rootless():
return (77, "requires root privileges")
return helper_test_some_caps(1000, ["ambient", "permitted", "inheritable"], 'CapPrm')
all_tests = {
"no-caps" : test_no_caps,
"new-privs" : test_new_privs,
"some-caps-bounding" : test_some_caps_bounding,
"some-caps-inheritable" : test_some_caps_inheritable,
"some-caps-ambient" : test_some_caps_ambient,
"some-caps-permitted" : test_some_caps_permitted,
"some-caps-effective-non-root" : test_some_caps_effective_non_root,
"some-caps-bounding-non-root" : test_some_caps_bounding_non_root,
"some-caps-inheritable-non-root" : test_some_caps_inheritable_non_root,
"some-caps-ambient-non-root" : test_some_caps_ambient_non_root,
"some-caps-permitted-non-root" : test_some_caps_permitted_non_root,
"unknown-caps" : test_unknown_caps,
}
if __name__ == "__main__":
tests_main(all_tests)
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