TestBrokerPolicy.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "gtest/gtest.h"

#include "broker/SandboxBroker.h"

namespace mozilla {

static const int MAY_ACCESS = SandboxBroker::MAY_ACCESS;

static const int MAY_READ = SandboxBroker::MAY_READ;

static const int MAY_WRITE = SandboxBroker::MAY_WRITE;

// static const int MAY_CREATE = SandboxBroker::MAY_CREATE;

// static const int RECURSIVE = SandboxBroker::RECURSIVE;

static const auto AddAlways = SandboxBroker::Policy::AddAlways;

TEST(SandboxBrokerPolicyLookup, Simple)

  SandboxBroker::Policy p;

  p.AddPath(MAY_READ, "/dev/urandom", AddAlways);

  EXPECT_NE(0, p.Lookup("/dev/urandom")) << "Added path not found.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ, p.Lookup("/dev/urandom"))

      << "Added path found with wrong perms.";

  EXPECT_EQ(0, p.Lookup("/etc/passwd")) << "Non-added path was found.";

TEST(SandboxBrokerPolicyLookup, CopyCtor)

  SandboxBroker::Policy psrc;

  psrc.AddPath(MAY_READ | MAY_WRITE, "/dev/null", AddAlways);

  SandboxBroker::Policy pdst(psrc);

  psrc.AddPath(MAY_READ, "/dev/zero", AddAlways);

  pdst.AddPath(MAY_READ, "/dev/urandom", AddAlways);

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, psrc.Lookup("/dev/null"))

      << "Common path absent in copy source.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, pdst.Lookup("/dev/null"))

      << "Common path absent in copy destination.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ, psrc.Lookup("/dev/zero"))

      << "Source-only path is absent.";

  EXPECT_EQ(0, pdst.Lookup("/dev/zero"))

      << "Source-only path is present in copy destination.";

  EXPECT_EQ(0, psrc.Lookup("/dev/urandom"))

      << "Destination-only path is present in copy source.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ, pdst.Lookup("/dev/urandom"))

      << "Destination-only path is absent.";

  EXPECT_EQ(0, psrc.Lookup("/etc/passwd"))

      << "Non-added path is present in copy source.";

  EXPECT_EQ(0, pdst.Lookup("/etc/passwd"))

      << "Non-added path is present in copy source.";

TEST(SandboxBrokerPolicyLookup, Recursive)

  SandboxBroker::Policy psrc;

  psrc.AddPath(MAY_READ | MAY_WRITE, "/dev/null", AddAlways);

  psrc.AddPath(MAY_READ, "/dev/zero", AddAlways);

  psrc.AddPath(MAY_READ, "/dev/urandom", AddAlways);

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, psrc.Lookup("/dev/null"))

      << "Basic path is present.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ, psrc.Lookup("/dev/zero"))

      << "Basic path has no extra flags";

  psrc.AddDir(MAY_READ | MAY_WRITE, "/dev/");

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, psrc.Lookup("/dev/random"))

      << "Permission via recursive dir.";

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, psrc.Lookup("/dev/sd/0"))

      << "Permission via recursive dir, nested deeper";

  EXPECT_EQ(0, psrc.Lookup("/dev/sd/0/")) << "Invalid path format.";

  EXPECT_EQ(0, psrc.Lookup("/usr/dev/sd")) << "Match must be a prefix.";

  psrc.AddDir(MAY_READ, "/dev/sd/");

  EXPECT_EQ(MAY_ACCESS | MAY_READ | MAY_WRITE, psrc.Lookup("/dev/sd/0"))

      << "Extra permissions from parent path granted.";

  EXPECT_EQ(0, psrc.Lookup("/dev/..")) << "Refuse attempted subdir escape.";

  psrc.AddDir(MAY_READ, "/tmp");

  EXPECT_EQ(MAY_ACCESS | MAY_READ, psrc.Lookup("/tmp/good/a"))

      << "Check whether dir add with no trailing / was sucessful.";

  EXPECT_EQ(0, psrc.Lookup("/tmp_good_but_bad"))

      << "Enforce terminator on directories.";

  EXPECT_EQ(0, psrc.Lookup("/tmp/."))

      << "Do not allow opening a directory handle.";

}  // namespace mozilla