2019-04-29 21:25:05 +00:00
|
|
|
// Copyright 2018 The gVisor Authors.
|
2018-12-10 22:41:40 +00:00
|
|
|
//
|
|
|
|
// 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 <fcntl.h>
|
|
|
|
#include <grp.h>
|
|
|
|
#include <sys/prctl.h>
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <unistd.h>
|
2019-09-16 18:56:59 +00:00
|
|
|
|
2018-12-10 22:41:40 +00:00
|
|
|
#include <vector>
|
|
|
|
|
|
|
|
#include "gtest/gtest.h"
|
2019-09-16 18:56:59 +00:00
|
|
|
#include "absl/flags/flag.h"
|
2018-12-10 22:41:40 +00:00
|
|
|
#include "test/util/capability_util.h"
|
|
|
|
#include "test/util/file_descriptor.h"
|
|
|
|
#include "test/util/fs_util.h"
|
|
|
|
#include "test/util/temp_path.h"
|
|
|
|
#include "test/util/test_util.h"
|
|
|
|
#include "test/util/thread_util.h"
|
|
|
|
|
2020-01-22 00:16:51 +00:00
|
|
|
ABSL_FLAG(int32_t, scratch_uid, 65534, "first scratch UID");
|
|
|
|
ABSL_FLAG(int32_t, scratch_gid, 65534, "first scratch GID");
|
2018-12-10 22:41:40 +00:00
|
|
|
|
|
|
|
namespace gvisor {
|
|
|
|
namespace testing {
|
|
|
|
|
|
|
|
namespace {
|
|
|
|
|
|
|
|
TEST(StickyTest, StickyBitPermDenied) {
|
|
|
|
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
|
|
|
|
|
|
|
|
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
|
|
|
|
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
|
|
|
|
std::string path = JoinPath(dir.path(), "NewDir");
|
|
|
|
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
|
|
|
|
|
|
|
|
// Drop privileges and change IDs only in child thread, or else this parent
|
|
|
|
// thread won't be able to open some log files after the test ends.
|
|
|
|
ScopedThread([&] {
|
|
|
|
// Drop privileges.
|
|
|
|
if (HaveCapability(CAP_FOWNER).ValueOrDie()) {
|
|
|
|
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, false));
|
|
|
|
}
|
|
|
|
|
|
|
|
// Change EUID and EGID.
|
2019-09-16 18:56:59 +00:00
|
|
|
EXPECT_THAT(
|
|
|
|
syscall(SYS_setresgid, -1, absl::GetFlag(FLAGS_scratch_gid), -1),
|
|
|
|
SyscallSucceeds());
|
|
|
|
EXPECT_THAT(
|
|
|
|
syscall(SYS_setresuid, -1, absl::GetFlag(FLAGS_scratch_uid), -1),
|
|
|
|
SyscallSucceeds());
|
2018-12-10 22:41:40 +00:00
|
|
|
|
|
|
|
EXPECT_THAT(rmdir(path.c_str()), SyscallFailsWithErrno(EPERM));
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
TEST(StickyTest, StickyBitSameUID) {
|
|
|
|
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
|
|
|
|
|
|
|
|
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
|
|
|
|
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
|
|
|
|
std::string path = JoinPath(dir.path(), "NewDir");
|
|
|
|
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
|
|
|
|
|
|
|
|
// Drop privileges and change IDs only in child thread, or else this parent
|
|
|
|
// thread won't be able to open some log files after the test ends.
|
|
|
|
ScopedThread([&] {
|
|
|
|
// Drop privileges.
|
|
|
|
if (HaveCapability(CAP_FOWNER).ValueOrDie()) {
|
|
|
|
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, false));
|
|
|
|
}
|
|
|
|
|
|
|
|
// Change EGID.
|
2019-09-16 18:56:59 +00:00
|
|
|
EXPECT_THAT(
|
|
|
|
syscall(SYS_setresgid, -1, absl::GetFlag(FLAGS_scratch_gid), -1),
|
|
|
|
SyscallSucceeds());
|
2018-12-10 22:41:40 +00:00
|
|
|
|
|
|
|
// We still have the same EUID.
|
|
|
|
EXPECT_THAT(rmdir(path.c_str()), SyscallSucceeds());
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
TEST(StickyTest, StickyBitCapFOWNER) {
|
|
|
|
SKIP_IF(!ASSERT_NO_ERRNO_AND_VALUE(HaveCapability(CAP_SETUID)));
|
|
|
|
|
|
|
|
auto dir = ASSERT_NO_ERRNO_AND_VALUE(TempPath::CreateDir());
|
|
|
|
EXPECT_THAT(chmod(dir.path().c_str(), 0777 | S_ISVTX), SyscallSucceeds());
|
|
|
|
std::string path = JoinPath(dir.path(), "NewDir");
|
|
|
|
ASSERT_THAT(mkdir(path.c_str(), 0755), SyscallSucceeds());
|
|
|
|
|
|
|
|
// Drop privileges and change IDs only in child thread, or else this parent
|
|
|
|
// thread won't be able to open some log files after the test ends.
|
|
|
|
ScopedThread([&] {
|
|
|
|
// Set PR_SET_KEEPCAPS.
|
|
|
|
EXPECT_THAT(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0), SyscallSucceeds());
|
|
|
|
|
|
|
|
// Change EUID and EGID.
|
2019-09-16 18:56:59 +00:00
|
|
|
EXPECT_THAT(
|
|
|
|
syscall(SYS_setresgid, -1, absl::GetFlag(FLAGS_scratch_gid), -1),
|
|
|
|
SyscallSucceeds());
|
|
|
|
EXPECT_THAT(
|
|
|
|
syscall(SYS_setresuid, -1, absl::GetFlag(FLAGS_scratch_uid), -1),
|
|
|
|
SyscallSucceeds());
|
2018-12-10 22:41:40 +00:00
|
|
|
|
|
|
|
EXPECT_NO_ERRNO(SetCapability(CAP_FOWNER, true));
|
|
|
|
EXPECT_THAT(rmdir(path.c_str()), SyscallSucceeds());
|
|
|
|
});
|
|
|
|
}
|
|
|
|
} // namespace
|
|
|
|
|
|
|
|
} // namespace testing
|
|
|
|
} // namespace gvisor
|