171 lines
5.5 KiB
C++
171 lines
5.5 KiB
C++
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "gtest/gtest.h"
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#include "test/util/capability_util.h"
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#include "test/util/fs_util.h"
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#include "test/util/temp_path.h"
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#include "test/util/test_util.h"
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using ::testing::Ge;
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namespace gvisor {
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namespace testing {
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namespace {
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class AccessTest : public ::testing::Test {
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public:
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std::string CreateTempFile(int perm) {
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const std::string path = NewTempAbsPath();
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const int fd = open(path.c_str(), O_CREAT | O_RDONLY, perm);
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TEST_PCHECK(fd > 0);
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TEST_PCHECK(close(fd) == 0);
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return path;
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}
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protected:
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// SetUp creates various configurations of files.
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void SetUp() override {
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// Move to the temporary directory. This allows us to reason more easily
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// about absolute and relative paths.
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ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds());
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// Create an empty file, standard permissions.
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relfile_ = NewTempRelPath();
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int fd;
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ASSERT_THAT(fd = open(relfile_.c_str(), O_CREAT | O_TRUNC, 0644),
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SyscallSucceedsWithValue(Ge(0)));
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ASSERT_THAT(close(fd), SyscallSucceeds());
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absfile_ = GetAbsoluteTestTmpdir() + "/" + relfile_;
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// Create an empty directory, no writable permissions.
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absdir_ = NewTempAbsPath();
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reldir_ = JoinPath(Basename(absdir_), "");
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ASSERT_THAT(mkdir(reldir_.c_str(), 0555), SyscallSucceeds());
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// This file doesn't exist.
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relnone_ = NewTempRelPath();
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absnone_ = GetAbsoluteTestTmpdir() + "/" + relnone_;
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}
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// TearDown unlinks created files.
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void TearDown() override {
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ASSERT_THAT(unlink(absfile_.c_str()), SyscallSucceeds());
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ASSERT_THAT(rmdir(absdir_.c_str()), SyscallSucceeds());
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}
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std::string relfile_;
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std::string reldir_;
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std::string absfile_;
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std::string absdir_;
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std::string relnone_;
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std::string absnone_;
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};
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TEST_F(AccessTest, RelativeFile) {
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EXPECT_THAT(access(relfile_.c_str(), R_OK), SyscallSucceeds());
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}
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TEST_F(AccessTest, RelativeDir) {
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EXPECT_THAT(access(reldir_.c_str(), R_OK | X_OK), SyscallSucceeds());
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}
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TEST_F(AccessTest, AbsFile) {
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EXPECT_THAT(access(absfile_.c_str(), R_OK), SyscallSucceeds());
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}
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TEST_F(AccessTest, AbsDir) {
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EXPECT_THAT(access(absdir_.c_str(), R_OK | X_OK), SyscallSucceeds());
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}
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TEST_F(AccessTest, RelDoesNotExist) {
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EXPECT_THAT(access(relnone_.c_str(), R_OK), SyscallFailsWithErrno(ENOENT));
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}
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TEST_F(AccessTest, AbsDoesNotExist) {
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EXPECT_THAT(access(absnone_.c_str(), R_OK), SyscallFailsWithErrno(ENOENT));
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}
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TEST_F(AccessTest, InvalidMode) {
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EXPECT_THAT(access(relfile_.c_str(), 0xffffffff),
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SyscallFailsWithErrno(EINVAL));
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}
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TEST_F(AccessTest, NoPerms) {
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// Drop capabilities that allow us to override permissions. We must drop
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// PERMITTED because access() checks those instead of EFFECTIVE.
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
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EXPECT_THAT(access(absdir_.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
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}
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TEST_F(AccessTest, InvalidName) {
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EXPECT_THAT(access(reinterpret_cast<char*>(0x1234), W_OK),
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SyscallFailsWithErrno(EFAULT));
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}
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TEST_F(AccessTest, UsrReadOnly) {
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// Drop capabilities that allow us to override permissions. We must drop
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// PERMITTED because access() checks those instead of EFFECTIVE.
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
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const std::string filename = CreateTempFile(0400);
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EXPECT_THAT(access(filename.c_str(), R_OK), SyscallSucceeds());
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EXPECT_THAT(access(filename.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
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EXPECT_THAT(access(filename.c_str(), X_OK), SyscallFailsWithErrno(EACCES));
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EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
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}
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TEST_F(AccessTest, UsrReadExec) {
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// Drop capabilities that allow us to override permissions. We must drop
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// PERMITTED because access() checks those instead of EFFECTIVE.
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
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ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
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const std::string filename = CreateTempFile(0500);
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EXPECT_THAT(access(filename.c_str(), R_OK | X_OK), SyscallSucceeds());
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EXPECT_THAT(access(filename.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
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EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
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}
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TEST_F(AccessTest, UsrReadWrite) {
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const std::string filename = CreateTempFile(0600);
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EXPECT_THAT(access(filename.c_str(), R_OK | W_OK), SyscallSucceeds());
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EXPECT_THAT(access(filename.c_str(), X_OK), SyscallFailsWithErrno(EACCES));
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EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
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}
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TEST_F(AccessTest, UsrReadWriteExec) {
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const std::string filename = CreateTempFile(0700);
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EXPECT_THAT(access(filename.c_str(), R_OK | W_OK | X_OK), SyscallSucceeds());
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EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
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}
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} // namespace
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} // namespace testing
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} // namespace gvisor
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