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// Copyright 2018 Google LLC
//
// 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 <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/capability_util.h"
#include "test/util/fs_util.h"
#include "test/util/temp_path.h"
#include "test/util/test_util.h"
using ::testing::Ge;
namespace gvisor {
namespace testing {
namespace {
class AccessTest : public ::testing::Test {
public:
std::string CreateTempFile(int perm) {
const std::string path = NewTempAbsPath();
const int fd = open(path.c_str(), O_CREAT | O_RDONLY, perm);
TEST_PCHECK(fd > 0);
TEST_PCHECK(close(fd) == 0);
return path;
}
protected:
// SetUp creates various configurations of files.
void SetUp() override {
// Move to the temporary directory. This allows us to reason more easily
// about absolute and relative paths.
ASSERT_THAT(chdir(GetAbsoluteTestTmpdir().c_str()), SyscallSucceeds());
// Create an empty file, standard permissions.
relfile_ = NewTempRelPath();
int fd;
ASSERT_THAT(fd = open(relfile_.c_str(), O_CREAT | O_TRUNC, 0644),
SyscallSucceedsWithValue(Ge(0)));
ASSERT_THAT(close(fd), SyscallSucceeds());
absfile_ = GetAbsoluteTestTmpdir() + "/" + relfile_;
// Create an empty directory, no writable permissions.
absdir_ = NewTempAbsPath();
reldir_ = JoinPath(Basename(absdir_), "");
ASSERT_THAT(mkdir(reldir_.c_str(), 0555), SyscallSucceeds());
// This file doesn't exist.
relnone_ = NewTempRelPath();
absnone_ = GetAbsoluteTestTmpdir() + "/" + relnone_;
}
// TearDown unlinks created files.
void TearDown() override {
ASSERT_THAT(unlink(absfile_.c_str()), SyscallSucceeds());
ASSERT_THAT(rmdir(absdir_.c_str()), SyscallSucceeds());
}
std::string relfile_;
std::string reldir_;
std::string absfile_;
std::string absdir_;
std::string relnone_;
std::string absnone_;
};
TEST_F(AccessTest, RelativeFile) {
EXPECT_THAT(access(relfile_.c_str(), R_OK), SyscallSucceeds());
}
TEST_F(AccessTest, RelativeDir) {
EXPECT_THAT(access(reldir_.c_str(), R_OK | X_OK), SyscallSucceeds());
}
TEST_F(AccessTest, AbsFile) {
EXPECT_THAT(access(absfile_.c_str(), R_OK), SyscallSucceeds());
}
TEST_F(AccessTest, AbsDir) {
EXPECT_THAT(access(absdir_.c_str(), R_OK | X_OK), SyscallSucceeds());
}
TEST_F(AccessTest, RelDoesNotExist) {
EXPECT_THAT(access(relnone_.c_str(), R_OK), SyscallFailsWithErrno(ENOENT));
}
TEST_F(AccessTest, AbsDoesNotExist) {
EXPECT_THAT(access(absnone_.c_str(), R_OK), SyscallFailsWithErrno(ENOENT));
}
TEST_F(AccessTest, InvalidMode) {
EXPECT_THAT(access(relfile_.c_str(), 0xffffffff),
SyscallFailsWithErrno(EINVAL));
}
TEST_F(AccessTest, NoPerms) {
// Drop capabilities that allow us to override permissions. We must drop
// PERMITTED because access() checks those instead of EFFECTIVE.
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
EXPECT_THAT(access(absdir_.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
}
TEST_F(AccessTest, InvalidName) {
EXPECT_THAT(access(reinterpret_cast<char*>(0x1234), W_OK),
SyscallFailsWithErrno(EFAULT));
}
TEST_F(AccessTest, UsrReadOnly) {
// Drop capabilities that allow us to override permissions. We must drop
// PERMITTED because access() checks those instead of EFFECTIVE.
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
const std::string filename = CreateTempFile(0400);
EXPECT_THAT(access(filename.c_str(), R_OK), SyscallSucceeds());
EXPECT_THAT(access(filename.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
EXPECT_THAT(access(filename.c_str(), X_OK), SyscallFailsWithErrno(EACCES));
EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
}
TEST_F(AccessTest, UsrReadExec) {
// Drop capabilities that allow us to override permissions. We must drop
// PERMITTED because access() checks those instead of EFFECTIVE.
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_OVERRIDE));
ASSERT_NO_ERRNO(DropPermittedCapability(CAP_DAC_READ_SEARCH));
const std::string filename = CreateTempFile(0500);
EXPECT_THAT(access(filename.c_str(), R_OK | X_OK), SyscallSucceeds());
EXPECT_THAT(access(filename.c_str(), W_OK), SyscallFailsWithErrno(EACCES));
EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
}
TEST_F(AccessTest, UsrReadWrite) {
const std::string filename = CreateTempFile(0600);
EXPECT_THAT(access(filename.c_str(), R_OK | W_OK), SyscallSucceeds());
EXPECT_THAT(access(filename.c_str(), X_OK), SyscallFailsWithErrno(EACCES));
EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
}
TEST_F(AccessTest, UsrReadWriteExec) {
const std::string filename = CreateTempFile(0700);
EXPECT_THAT(access(filename.c_str(), R_OK | W_OK | X_OK), SyscallSucceeds());
EXPECT_THAT(unlink(filename.c_str()), SyscallSucceeds());
}
} // namespace
} // namespace testing
} // namespace gvisor
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