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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <arpa/inet.h>
#include <errno.h>
#include <linux/if_packet.h>
#include <linux/if_tun.h>
#include <net/if.h>
#include <poll.h>
#include <sched.h>
#include <sys/capability.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <gtest/gtest.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#define LOG_TAG "NetdTest"
#include "TcUtils.h"
namespace android {
namespace net {
using base::unique_fd;
TEST(NetUtilsWrapperTest, TestFileCapabilities) {
errno = 0;
ASSERT_EQ(NULL, cap_get_file("/system/bin/netutils-wrapper-1.0"));
ASSERT_EQ(ENODATA, errno);
}
// If this test fails most likely your device is lacking device/oem specific
// selinux genfscon rules, something like .../vendor/.../genfs_contexts:
// genfscon sysfs /devices/platform/.../net u:object_r:sysfs_net:s0
// Easiest debugging is via:
// adb root && sleep 1 && adb shell 'ls -Z /sys/class/net/*/mtu'
// and look for the mislabeled item(s).
// Everything should be 'u:object_r:sysfs_net:s0'
//
// Another useful command is:
// adb root && sleep 1 && adb shell find /sys > dump.out
// or in particular:
// adb root && sleep 1 && adb shell find /sys | egrep '/net$'
// which might (among other things) print out something like:
// /sys/devices/platform/11110000.usb/11110000.dwc3/gadget/net
// which means you need to add:
// genfscon sysfs /devices/platform/11110000.usb/11110000.dwc3/gadget/net u:object_r:sysfs_net:s0
TEST(NetdSELinuxTest, CheckProperMTULabels) {
// Since we expect the egrep regexp to filter everything out,
// we thus expect no matches and thus a return code of 1
// NOLINTNEXTLINE(cert-env33-c)
ASSERT_EQ(W_EXITCODE(1, 0), system("ls -Z /sys/class/net/*/mtu | egrep -q -v "
"'^u:object_r:sysfs_net:s0 /sys/class/net/'"));
}
static void assertBpfContext(const char* const target, const char* const label) {
// Use 'ls' cli utility to print the selinux context of the target directory or file.
// egrep -q will return 0 if it matches, ie. if the selinux context is as expected
std::string cmd = android::base::StringPrintf("ls -dZ %s | egrep -q '^u:object_r:%s:s0 %s$'",
target, label, target);
// NOLINTNEXTLINE(cert-env33-c)
ASSERT_EQ(W_EXITCODE(0, 0), system(cmd.c_str())) << cmd << " - did not return success(0)"
" - is kernel missing https://android-review.googlesource.com/c/kernel/common/+/1831252"
" 'UPSTREAM: security: selinux: allow per-file labeling for bpffs' ?";
}
// This test will fail if kernel is missing:
// https://android-review.googlesource.com/c/kernel/common/+/1831252
// UPSTREAM: security: selinux: allow per-file labeling for bpffs
TEST(NetdSELinuxTest, CheckProperBpfLabels) {
assertBpfContext("/sys/fs/bpf", "fs_bpf");
assertBpfContext("/sys/fs/bpf/net_private", "fs_bpf_net_private");
assertBpfContext("/sys/fs/bpf/net_shared", "fs_bpf_net_shared");
assertBpfContext("/sys/fs/bpf/netd_readonly", "fs_bpf_netd_readonly");
assertBpfContext("/sys/fs/bpf/netd_shared", "fs_bpf_netd_shared");
assertBpfContext("/sys/fs/bpf/tethering", "fs_bpf_tethering");
assertBpfContext("/sys/fs/bpf/vendor", "fs_bpf_vendor");
assertBpfContext("/sys/fs/bpf/loader", "fs_bpf_loader");
}
// Trivial thread function that simply immediately terminates successfully.
static int thread(void*) {
return 0;
}
typedef int (*thread_t)(void*);
static void nsTest(int flags, bool success, thread_t newThread) {
// We need a minimal stack, but not clear if it will grow up or down,
// So allocate 2 pages and give a pointer to the middle.
static char stack[PAGE_SIZE * 2];
errno = 0;
// VFORK: if thread is successfully created, then kernel will wait for it
// to terminate before we resume -> hence static stack is safe to reuse.
int tid = clone(newThread, &stack[PAGE_SIZE], flags | CLONE_VFORK, NULL);
if (success) {
ASSERT_EQ(errno, 0);
ASSERT_GE(tid, 0);
} else {
ASSERT_EQ(errno, EINVAL);
ASSERT_EQ(tid, -1);
}
}
// Test kernel configuration option CONFIG_NAMESPACES=y
TEST(NetdNamespaceTest, CheckMountNamespaceSupport) {
nsTest(CLONE_NEWNS, true, thread);
}
// Test kernel configuration option CONFIG_UTS_NS=y
TEST(NetdNamespaceTest, CheckUTSNamespaceSupport) {
nsTest(CLONE_NEWUTS, true, thread);
}
// Test kernel configuration option CONFIG_NET_NS=y
TEST(NetdNamespaceTest, CheckNetworkNamespaceSupport) {
nsTest(CLONE_NEWNET, true, thread);
}
// Test kernel configuration option CONFIG_USER_NS=n
TEST(NetdNamespaceTest, /*DISABLED_*/ CheckNoUserNamespaceSupport) {
nsTest(CLONE_NEWUSER, false, thread);
}
// Test for all of the above
TEST(NetdNamespaceTest, CheckFullNamespaceSupport) {
nsTest(CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWNET, true, thread);
}
} // namespace net
} // namespace android
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