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/*
* Copyright (C) 2021 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 "common/libs/utils/unix_sockets.h"
#include <string>
#include <utility>
#include <android-base/logging.h>
#include <android-base/result.h>
#include <gtest/gtest.h>
#include "common/libs/fs/shared_buf.h"
#include "common/libs/fs/shared_fd.h"
namespace cuttlefish {
SharedFD CreateMemFDWithData(const std::string& data) {
auto memfd = SharedFD::MemfdCreate("");
CHECK(WriteAll(memfd, data) == data.size()) << memfd->StrError();
CHECK(memfd->LSeek(0, SEEK_SET) == 0);
return memfd;
}
std::string ReadAllFDData(SharedFD fd) {
std::string data;
CHECK(ReadAll(fd, &data) > 0) << fd->StrError();
return data;
}
TEST(UnixSocketMessage, ExtractFileDescriptors) {
auto memfd1 = CreateMemFDWithData("abc");
auto memfd2 = CreateMemFDWithData("def");
UnixSocketMessage message;
auto control1 = ControlMessage::FromFileDescriptors({memfd1});
ASSERT_TRUE(control1.ok()) << control1.error().Trace();
message.control.emplace_back(std::move(*control1));
auto control2 = ControlMessage::FromFileDescriptors({memfd2});
ASSERT_TRUE(control2.ok()) << control2.error().Trace();
message.control.emplace_back(std::move(*control2));
ASSERT_TRUE(message.HasFileDescriptors());
auto fds = message.FileDescriptors();
ASSERT_TRUE(fds.ok());
ASSERT_EQ("abc", ReadAllFDData((*fds)[0]));
ASSERT_EQ("def", ReadAllFDData((*fds)[1]));
}
std::pair<UnixMessageSocket, UnixMessageSocket> UnixMessageSocketPair() {
SharedFD sock1, sock2;
CHECK(SharedFD::SocketPair(AF_UNIX, SOCK_SEQPACKET, 0, &sock1, &sock2));
return {UnixMessageSocket(sock1), UnixMessageSocket(sock2)};
}
TEST(UnixMessageSocket, SendPlainMessage) {
auto [writer, reader] = UnixMessageSocketPair();
UnixSocketMessage message_in = {{1, 2, 3}, {}};
auto write_result = writer.WriteMessage(message_in);
ASSERT_TRUE(write_result.ok()) << write_result.error().Trace();
auto message_out = reader.ReadMessage();
ASSERT_TRUE(message_out.ok()) << message_out.error().Trace();
ASSERT_EQ(message_in.data, message_out->data);
ASSERT_EQ(0, message_out->control.size());
}
TEST(UnixMessageSocket, SendFileDescriptor) {
auto [writer, reader] = UnixMessageSocketPair();
UnixSocketMessage message_in = {{4, 5, 6}, {}};
auto control_in =
ControlMessage::FromFileDescriptors({CreateMemFDWithData("abc")});
ASSERT_TRUE(control_in.ok()) << control_in.error().Trace();
message_in.control.emplace_back(std::move(*control_in));
auto write_result = writer.WriteMessage(message_in);
ASSERT_TRUE(write_result.ok()) << write_result.error().Trace();
auto message_out = reader.ReadMessage();
ASSERT_TRUE(message_out.ok()) << message_out.error().Trace();
ASSERT_EQ(message_in.data, message_out->data);
ASSERT_EQ(1, message_out->control.size());
auto fds_out = message_out->control[0].AsSharedFDs();
ASSERT_TRUE(fds_out.ok()) << fds_out.error().Trace();
ASSERT_EQ(1, fds_out->size());
ASSERT_EQ("abc", ReadAllFDData((*fds_out)[0]));
}
TEST(UnixMessageSocket, SendTwoFileDescriptors) {
auto memfd1 = CreateMemFDWithData("abc");
auto memfd2 = CreateMemFDWithData("def");
auto [writer, reader] = UnixMessageSocketPair();
UnixSocketMessage message_in = {{7, 8, 9}, {}};
auto control_in = ControlMessage::FromFileDescriptors({memfd1, memfd2});
ASSERT_TRUE(control_in.ok()) << control_in.error().Trace();
message_in.control.emplace_back(std::move(*control_in));
auto write_result = writer.WriteMessage(message_in);
ASSERT_TRUE(write_result.ok()) << write_result.error().Trace();
auto message_out = reader.ReadMessage();
ASSERT_TRUE(message_out.ok()) << message_out.error().Trace();
ASSERT_EQ(message_in.data, message_out->data);
ASSERT_EQ(1, message_out->control.size());
auto fds_out = message_out->control[0].AsSharedFDs();
ASSERT_TRUE(fds_out.ok()) << fds_out.error().Trace();
ASSERT_EQ(2, fds_out->size());
ASSERT_EQ("abc", ReadAllFDData((*fds_out)[0]));
ASSERT_EQ("def", ReadAllFDData((*fds_out)[1]));
}
TEST(UnixMessageSocket, SendCredentials) {
auto [writer, reader] = UnixMessageSocketPair();
auto writer_creds_status = writer.EnableCredentials(true);
ASSERT_TRUE(writer_creds_status.ok()) << writer_creds_status.error().Trace();
auto reader_creds_status = reader.EnableCredentials(true);
ASSERT_TRUE(reader_creds_status.ok()) << reader_creds_status.error().Trace();
ucred credentials_in;
credentials_in.pid = getpid();
credentials_in.uid = getuid();
credentials_in.gid = getgid();
UnixSocketMessage message_in = {{1, 5, 9}, {}};
auto control_in = ControlMessage::FromCredentials(credentials_in);
message_in.control.emplace_back(std::move(control_in));
auto write_result = writer.WriteMessage(message_in);
ASSERT_TRUE(write_result.ok()) << write_result.error().Trace();
auto message_out = reader.ReadMessage();
ASSERT_TRUE(message_out.ok()) << message_out.error().Trace();
ASSERT_EQ(message_in.data, message_out->data);
ASSERT_EQ(1, message_out->control.size());
auto credentials_out = message_out->control[0].AsCredentials();
ASSERT_TRUE(credentials_out.ok()) << credentials_out.error().Trace();
ASSERT_EQ(credentials_in.pid, credentials_out->pid);
ASSERT_EQ(credentials_in.uid, credentials_out->uid);
ASSERT_EQ(credentials_in.gid, credentials_out->gid);
}
TEST(UnixMessageSocket, BadCredentialsBlocked) {
auto [writer, reader] = UnixMessageSocketPair();
auto writer_creds_status = writer.EnableCredentials(true);
ASSERT_TRUE(writer_creds_status.ok()) << writer_creds_status.error().Trace();
auto reader_creds_status = reader.EnableCredentials(true);
ASSERT_TRUE(reader_creds_status.ok()) << reader_creds_status.error().Trace();
ucred credentials_in;
// This assumes the test is running without root privileges
credentials_in.pid = getpid() + 1;
credentials_in.uid = getuid() + 1;
credentials_in.gid = getgid() + 1;
UnixSocketMessage message_in = {{2, 4, 6}, {}};
auto control_in = ControlMessage::FromCredentials(credentials_in);
message_in.control.emplace_back(std::move(control_in));
auto write_result = writer.WriteMessage(message_in);
ASSERT_FALSE(write_result.ok()) << write_result.error().Trace();
}
TEST(UnixMessageSocket, AutoCredentials) {
auto [writer, reader] = UnixMessageSocketPair();
auto writer_creds_status = writer.EnableCredentials(true);
ASSERT_TRUE(writer_creds_status.ok()) << writer_creds_status.error().Trace();
auto reader_creds_status = reader.EnableCredentials(true);
ASSERT_TRUE(reader_creds_status.ok()) << reader_creds_status.error().Trace();
UnixSocketMessage message_in = {{3, 6, 9}, {}};
auto write_result = writer.WriteMessage(message_in);
ASSERT_TRUE(write_result.ok()) << write_result.error().Trace();
auto message_out = reader.ReadMessage();
ASSERT_TRUE(message_out.ok()) << message_out.error().Trace();
ASSERT_EQ(message_in.data, message_out->data);
ASSERT_EQ(1, message_out->control.size());
auto credentials_out = message_out->control[0].AsCredentials();
ASSERT_TRUE(credentials_out.ok()) << credentials_out.error().Trace();
ASSERT_EQ(getpid(), credentials_out->pid);
ASSERT_EQ(getuid(), credentials_out->uid);
ASSERT_EQ(getgid(), credentials_out->gid);
}
} // namespace cuttlefish
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