patchpanel/minijailed_process_runner_test.cc

// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "patchpanel/minijailed_process_runner.h"

#include <linux/capability.h>
#include <memory>

#include <brillo/minijail/mock_minijail.h>
#include <gmock/gmock.h>
#include <gtest/gtest.h>

#include "patchpanel/net_util.h"

using testing::_;
using testing::DoAll;
using testing::Eq;
using testing::Return;
using testing::SetArgPointee;
using testing::StrEq;

namespace patchpanel {
namespace {

constexpr pid_t kFakePid = 123;

class FakeSyscallImpl : public MinijailedProcessRunner::SyscallImpl {
 public:
  pid_t WaitPID(pid_t pid, int* wstatus, int options) override { return pid; }
};

class MinijailProcessRunnerTest : public testing::Test {
 protected:
  MinijailProcessRunnerTest()
      : runner_(&mj_, std::make_unique<FakeSyscallImpl>()) {}

  void SetUp() override {
    ON_CALL(mj_, DropRoot(_, _, _)).WillByDefault(Return(true));
    ON_CALL(mj_, RunPipesAndDestroy(_, _, _, _, _, _))
        .WillByDefault(DoAll(SetArgPointee<2>(kFakePid), Return(true)));
  }

  brillo::MockMinijail mj_;
  MinijailedProcessRunner runner_;
};

// Special matcher needed for vector<char*> type.
// Lifted from shill/process_manager_test.cc
MATCHER_P2(IsProcessArgs, program, args, "") {
  if (std::string(arg[0]) != program) {
    return false;
  }
  int index = 1;
  for (const auto& option : args) {
    if (std::string(arg[index++]) != option) {
      return false;
    }
  }
  return arg[index] == nullptr;
}

TEST_F(MinijailProcessRunnerTest, modprobe_all) {
  uint64_t caps = CAP_TO_MASK(CAP_SYS_MODULE);

  const std::vector<std::string> args = {"-a", "module1", "module2"};
  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, DropRoot(_, StrEq("nobody"), StrEq("nobody")));
  EXPECT_CALL(mj_, UseCapabilities(_, Eq(caps)));
  EXPECT_CALL(mj_, RunPipesAndDestroy(_, IsProcessArgs("/sbin/modprobe", args),
                                      _, _, _, _));
  runner_.modprobe_all({"module1", "module2"});
}

TEST_F(MinijailProcessRunnerTest, sysctl_w) {
  const std::vector<std::string> args = {"-w", "a.b.c=1"};
  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, RunPipesAndDestroy(
                       _, IsProcessArgs("/usr/sbin/sysctl", args), _, _, _, _));
  runner_.sysctl_w("a.b.c", "1");
}

TEST_F(MinijailProcessRunnerTest, chown) {
  uint64_t caps = CAP_TO_MASK(CAP_CHOWN);

  const std::vector<std::string> args = {"12345:23456", "foo"};
  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, DropRoot(_, StrEq("nobody"), StrEq("nobody")));
  EXPECT_CALL(mj_, UseCapabilities(_, Eq(caps)));
  EXPECT_CALL(mj_, RunPipesAndDestroy(_, IsProcessArgs("/bin/chown", args), _,
                                      _, _, _));
  runner_.chown("12345", "23456", "foo");
}

TEST_F(MinijailProcessRunnerTest, brctl) {
  uint64_t caps = CAP_TO_MASK(CAP_NET_ADMIN) | CAP_TO_MASK(CAP_NET_RAW);
  const std::vector<std::string> args = {"cmd", "arg", "arg"};

  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, DropRoot(_, StrEq("nobody"), StrEq("nobody")));
  EXPECT_CALL(mj_, UseCapabilities(_, Eq(caps)));
  EXPECT_CALL(mj_, RunPipesAndDestroy(_, IsProcessArgs("/sbin/brctl", args), _,
                                      _, _, _));
  runner_.brctl("cmd", {"arg", "arg"});
}

TEST_F(MinijailProcessRunnerTest, ip) {
  uint64_t caps = CAP_TO_MASK(CAP_NET_ADMIN) | CAP_TO_MASK(CAP_NET_RAW);
  const std::vector<std::string> args = {"obj", "cmd", "arg", "arg"};

  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, DropRoot(_, StrEq("nobody"), StrEq("nobody")));
  EXPECT_CALL(mj_, UseCapabilities(_, Eq(caps)));
  EXPECT_CALL(
      mj_, RunPipesAndDestroy(_, IsProcessArgs("/bin/ip", args), _, _, _, _));
  runner_.ip("obj", "cmd", {"arg", "arg"});
}

TEST_F(MinijailProcessRunnerTest, ip6) {
  uint64_t caps = CAP_TO_MASK(CAP_NET_ADMIN) | CAP_TO_MASK(CAP_NET_RAW);
  const std::vector<std::string> args = {"-6", "obj", "cmd", "arg", "arg"};

  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, DropRoot(_, StrEq("nobody"), StrEq("nobody")));
  EXPECT_CALL(mj_, UseCapabilities(_, Eq(caps)));
  EXPECT_CALL(
      mj_, RunPipesAndDestroy(_, IsProcessArgs("/bin/ip", args), _, _, _, _));
  runner_.ip6("obj", "cmd", {"arg", "arg"});
}

TEST_F(MinijailProcessRunnerTest, iptables) {
  const std::vector<std::string> args = {"-t", "table", "arg", "arg"};

  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, RunPipesAndDestroy(_, IsProcessArgs("/sbin/iptables", args),
                                      _, _, _, _));
  runner_.iptables("table", {"arg", "arg"});
}

TEST_F(MinijailProcessRunnerTest, ip6tables) {
  const std::vector<std::string> args = {"-t", "table", "arg", "arg"};

  EXPECT_CALL(mj_, New());
  EXPECT_CALL(mj_, RunPipesAndDestroy(_, IsProcessArgs("/sbin/ip6tables", args),
                                      _, _, _, _));
  runner_.ip6tables("table", {"arg", "arg"});
}

}  // namespace
}  // namespace patchpanel