mirror of
https://git.freebsd.org/ports.git
synced 2025-05-05 16:07:38 -04:00
3a9105aba4
Approved by: rene (mentor, implicit) Security: https://vuxml.freebsd.org/freebsd/246174d3-e979-11ed-8290-a8a1599412c6.html
423 lines
13 KiB
C++
423 lines
13 KiB
C++
--- sandbox/policy/openbsd/sandbox_openbsd.cc.orig 2023-04-28 17:01:32 UTC
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+++ sandbox/policy/openbsd/sandbox_openbsd.cc
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@@ -0,0 +1,420 @@
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style license that can be
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+// found in the LICENSE file.
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+
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+#include "sandbox/policy/openbsd/sandbox_openbsd.h"
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+
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+#include <dirent.h>
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+#include <fcntl.h>
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+#include <stdint.h>
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+#include <sys/resource.h>
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+#include <sys/stat.h>
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+#include <sys/time.h>
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+#include <sys/types.h>
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+#include <unistd.h>
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+#include <util.h>
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+
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+#include <limits>
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+#include <memory>
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+#include <string>
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+#include <vector>
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+
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+#include "base/command_line.h"
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+#include "base/debug/stack_trace.h"
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+#include "base/feature_list.h"
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+#include "base/files/file_path.h"
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+#include "base/files/file_util.h"
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+#include "base/files/scoped_file.h"
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+#include "base/logging.h"
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+#include "base/memory/singleton.h"
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+#include "base/path_service.h"
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+#include "base/posix/eintr_wrapper.h"
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+#include "base/strings/string_number_conversions.h"
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+#include "base/system/sys_info.h"
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+#include "base/threading/thread.h"
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+#include "base/time/time.h"
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+#include "build/build_config.h"
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+#include "crypto/crypto_buildflags.h"
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+#include "ppapi/buildflags/buildflags.h"
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+#include "sandbox/constants.h"
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+#include "sandbox/linux/services/credentials.h"
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+#include "sandbox/linux/services/namespace_sandbox.h"
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+#include "sandbox/linux/services/proc_util.h"
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+#include "sandbox/linux/services/resource_limits.h"
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+#include "sandbox/linux/services/thread_helpers.h"
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+#include "sandbox/linux/syscall_broker/broker_command.h"
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+#include "sandbox/linux/syscall_broker/broker_process.h"
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+#include "sandbox/policy/sandbox.h"
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+#include "sandbox/policy/sandbox_type.h"
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+#include "sandbox/policy/mojom/sandbox.mojom.h"
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+#include "sandbox/policy/switches.h"
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+#include "sandbox/sandbox_buildflags.h"
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+
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+#if BUILDFLAG(USING_SANITIZER)
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+#include <sanitizer/common_interface_defs.h>
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+#endif
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+
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+#if BUILDFLAG(USE_NSS_CERTS)
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+#include "crypto/nss_util.h"
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+#endif
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+
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+#include "third_party/boringssl/src/include/openssl/crypto.h"
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+
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+#include "ui/gfx/font_util.h"
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+
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+#define MAXTOKENS 3
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+
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+#define _UNVEIL_MAIN "/etc/chromium/unveil.main";
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+#define _UNVEIL_GPU "/etc/chromium/unveil.gpu";
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+#define _UNVEIL_UTILITY_NETWORK "/etc/chromium/unveil.utility_network";
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+#define _UNVEIL_UTILITY_AUDIO "/etc/chromium/unveil.utility_audio";
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+#define _UNVEIL_UTILITY_VIDEO "/etc/chromium/unveil.utility_video";
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+
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+namespace sandbox {
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+namespace policy {
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+
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+SandboxLinux::SandboxLinux()
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+ : unveil_initialized_(false),
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+ sandbox_status_flags_(kInvalid),
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+ pre_initialized_(false),
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+ initialize_sandbox_ran_(false),
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+ broker_process_(nullptr) {
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+}
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+
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+SandboxLinux::~SandboxLinux() {
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+ if (pre_initialized_) {
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+ CHECK(initialize_sandbox_ran_);
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+ }
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+}
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+
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+SandboxLinux* SandboxLinux::GetInstance() {
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+ SandboxLinux* instance = base::Singleton<SandboxLinux>::get();
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+ CHECK(instance);
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+ return instance;
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+}
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+
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+void SandboxLinux::StopThread(base::Thread* thread) {
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+ DCHECK(thread);
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+ thread->Stop();
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+}
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+
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+void SandboxLinux::PreinitializeSandbox(sandbox::mojom::Sandbox sandbox_type) {
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+ CHECK(!pre_initialized_);
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+#if BUILDFLAG(USING_SANITIZER)
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+ // Sanitizers need to open some resources before the sandbox is enabled.
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+ // This should not fork, not launch threads, not open a directory.
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+ __sanitizer_sandbox_on_notify(sanitizer_args());
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+ sanitizer_args_.reset();
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+#endif
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+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
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+ const std::string process_type =
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+ command_line->GetSwitchValueASCII(switches::kProcessType);
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+
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+ base::SysInfo::AmountOfPhysicalMemory();
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+ base::SysInfo::NumberOfProcessors();
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+ base::SysInfo::CPUModelName();
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+
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+ switch (sandbox_type) {
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+ case sandbox::mojom::Sandbox::kNoSandbox:
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+ {
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+#if BUILDFLAG(USE_NSS_CERTS)
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+ // The main process has to initialize the ~/.pki dir which won't work
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+ // after unveil(2).
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+ crypto::EnsureNSSInit();
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+#endif
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+ CRYPTO_pre_sandbox_init();
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+
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+ base::FilePath cache_directory, local_directory;
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+
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+ base::PathService::Get(base::DIR_CACHE, &cache_directory);
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+ base::PathService::Get(base::DIR_HOME, &local_directory);
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+
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+ cache_directory = cache_directory.AppendASCII("chromium");
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+ local_directory = local_directory.AppendASCII(".local").AppendASCII("share").AppendASCII("applications");
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+
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+ if (!base::CreateDirectory(cache_directory)) {
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+ LOG(ERROR) << "Failed to create " << cache_directory.value() << " directory.";
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+ }
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+
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+ if (!base::CreateDirectory(local_directory)) {
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+ LOG(ERROR) << "Failed to create " << local_directory.value() << " directory.";
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+ }
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+
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+ break;
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+ }
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+ case sandbox::mojom::Sandbox::kRenderer:
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+ gfx::InitializeFonts();
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+ break;
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+ default:
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+ break;
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+ }
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+
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+ pre_initialized_ = true;
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+}
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+
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+bool SandboxLinux::SetPledge(const char *pstring, const char *ppath) {
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+ FILE *fp;
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+ char *s = NULL;
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+ size_t len = 0;
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+ ssize_t read;
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+
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+ if (pstring != NULL) {
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+ if (pledge(pstring, NULL) == -1)
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+ goto err;
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+ VLOG(5) << "pledge " << pstring;
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+ } else if (ppath != NULL) {
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+ fp = fopen(ppath, "r");
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+ if (fp != NULL) {
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+ while ((read = getline(&s, &len, fp)) != -1 ) {
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+ if (s[strlen(s)-1] == '\n')
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+ s[strlen(s)-1] = '\0';
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+ if (pledge(s, NULL) == -1)
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+ goto err;
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+ VLOG(5) << "pledge " << s;
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+ }
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+ fclose(fp);
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+ } else {
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+ LOG(ERROR) << "fopen(" << ppath << ") failed, errno: " << errno;
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+ return false;
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+ }
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+ }
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+ return true;
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+err:
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+ LOG(ERROR) << "pledge() failed, errno: " << errno;
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+ return false;
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+}
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+
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+bool SandboxLinux::SetUnveil(const std::string process_type, sandbox::mojom::Sandbox sandbox_type) {
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+ FILE *fp;
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+ char *s = NULL, *cp = NULL, *home = NULL, **ap, *tokens[MAXTOKENS];
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+ char path[PATH_MAX];
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+ const char *ufile;
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+ size_t len = 0, lineno = 0;
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+
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+ switch (sandbox_type) {
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+ case sandbox::mojom::Sandbox::kNoSandbox:
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+ ufile = _UNVEIL_MAIN;
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+ break;
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+ case sandbox::mojom::Sandbox::kGpu:
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+ ufile = _UNVEIL_GPU;
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+ break;
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+ case sandbox::mojom::Sandbox::kNetwork:
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+ ufile = _UNVEIL_UTILITY_NETWORK;
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+ break;
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+ case sandbox::mojom::Sandbox::kAudio:
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+ ufile = _UNVEIL_UTILITY_AUDIO;
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+ break;
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+ case sandbox::mojom::Sandbox::kVideoCapture:
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+ ufile = _UNVEIL_UTILITY_VIDEO;
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+ break;
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+ default:
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+ unveil("/dev/null", "r");
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+ goto done;
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+ }
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+
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+ fp = fopen(ufile, "r");
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+ if (fp != NULL) {
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+ while (!feof(fp)) {
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+ if ((s = fparseln(fp, &len, &lineno, NULL,
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+ FPARSELN_UNESCCOMM | FPARSELN_UNESCCONT)) == NULL) {
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+ if (ferror(fp)) {
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+ LOG(ERROR) << "ferror(), errno: " << errno;
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+ _exit(1);
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+ } else {
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+ continue;
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+ }
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+ }
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+ cp = s;
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+ cp += strspn(cp, " \t\n"); /* eat whitespace */
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+ if (cp[0] == '\0')
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+ continue;
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+
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+ for (ap = tokens; ap < &tokens[MAXTOKENS - 1] &&
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+ (*ap = strsep(&cp, " \t")) != NULL;) {
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+ if (**ap != '\0')
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+ ap++;
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+ }
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+ *ap = NULL;
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+
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+ if (tokens[1] == NULL) {
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+ LOG(ERROR) << ufile << ": line " << lineno << ": must supply value to " << s;
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+ _exit(1);
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+ }
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+
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+ if (tokens[0][0] == '~') {
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+ if ((home = getenv("HOME")) == NULL || *home == '\0') {
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+ LOG(ERROR) << "failed to get home";
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+ _exit(1);
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+ }
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+ memmove(tokens[0], tokens[0] + 1, strlen(tokens[0]));
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+ strncpy(path, home, sizeof(path) - 1);
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+ path[sizeof(path) - 1] = '\0';
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+ strncat(path, tokens[0], sizeof(path) - 1 - strlen(path));
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+ } else {
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+ strncpy(path, tokens[0], sizeof(path) - 1);
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+ path[sizeof(path) - 1] = '\0';
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+ }
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+
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+ if (unveil(path, tokens[1]) == -1) {
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+ LOG(ERROR) << "failed unveiling " << path << " with permissions " << tokens[1];
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+ _exit(1);
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+ } else {
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+ VLOG(5) << "unveiling " << path << " with permissions " << tokens[1];
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+ }
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+ }
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+ fclose(fp);
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+ } else {
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+ LOG(ERROR) << "failed to open " << ufile << " errno: " << errno;
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+ _exit(1);
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+ }
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+
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+done:
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+ unveil_initialized_ = true;
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+
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+ return true;
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+}
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+
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+bool SandboxLinux::unveil_initialized() const {
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+ return unveil_initialized_;
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+}
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+
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+bool SandboxLinux::InitializeSandbox(sandbox::mojom::Sandbox sandbox_type,
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+ SandboxLinux::PreSandboxHook hook,
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+ const Options& options) {
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+ DCHECK(!initialize_sandbox_ran_);
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+ initialize_sandbox_ran_ = true;
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+
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+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
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+ const std::string process_type =
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+ command_line->GetSwitchValueASCII(switches::kProcessType);
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+
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+ if (command_line->HasSwitch(switches::kNoSandbox))
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+ return true;
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+
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+ VLOG(1) << "SandboxLinux::InitializeSandbox: process_type="
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+ << process_type << " sandbox_type=" << GetSandboxTypeInEnglish(sandbox_type);
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+
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+ // Only one thread is running, pre-initialize if not already done.
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+ if (!pre_initialized_)
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+ PreinitializeSandbox(sandbox_type);
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+
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+ // Attempt to limit the future size of the address space of the process.
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+ int error = 0;
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+ const bool limited_as = LimitAddressSpace(&error);
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+ if (error) {
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+ // Restore errno. Internally to |LimitAddressSpace|, the errno due to
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+ // setrlimit may be lost.
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+ errno = error;
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+ PCHECK(limited_as);
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+ }
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+
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+ if (hook)
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+ CHECK(std::move(hook).Run(options));
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+
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+ if (!command_line->HasSwitch(switches::kDisableUnveil))
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+ SetUnveil(process_type, sandbox_type);
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+
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+ switch(sandbox_type) {
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+ case sandbox::mojom::Sandbox::kNoSandbox:
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+ SetPledge(NULL, "/etc/chromium/pledge.main");
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+ break;
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+ case sandbox::mojom::Sandbox::kRenderer:
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+ // prot_exec needed by v8
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+ // flock needed by sqlite3 locking
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+ SetPledge("stdio rpath flock prot_exec recvfd sendfd ps", NULL);
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+ break;
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+ case sandbox::mojom::Sandbox::kGpu:
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+ SetPledge("stdio drm rpath flock cpath wpath prot_exec recvfd sendfd tmppath", NULL);
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+ break;
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+#if BUILDFLAG(ENABLE_PPAPI)
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+ case sandbox::mojom::Sandbox::kPpapi:
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+ // prot_exec needed by v8
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+ SetPledge("stdio rpath prot_exec recvfd sendfd", NULL);
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+ break;
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+#endif
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+ case sandbox::mojom::Sandbox::kAudio:
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+ SetPledge(NULL, "/etc/chromium/pledge.utility_audio");
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+ break;
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+ case sandbox::mojom::Sandbox::kNetwork:
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+ SetPledge(NULL, "/etc/chromium/pledge.utility_network");
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+ break;
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+ case sandbox::mojom::Sandbox::kVideoCapture:
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+ SetPledge(NULL, "/etc/chromium/pledge.utility_video");
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+ break;
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+ case sandbox::mojom::Sandbox::kUtility:
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+ case sandbox::mojom::Sandbox::kService:
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+ SetPledge("stdio rpath cpath wpath fattr flock sendfd recvfd prot_exec", NULL);
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+ break;
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+ default:
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+ LOG(ERROR) << "non-pledge()'d process: " << GetSandboxTypeInEnglish(sandbox_type);
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+ break;
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+ }
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+
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+ return true;
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+}
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+
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+bool SandboxLinux::LimitAddressSpace(int* error) {
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+#if !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) && \
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+ !defined(THREAD_SANITIZER) && !defined(LEAK_SANITIZER)
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+ base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
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+ if (SandboxTypeFromCommandLine(*command_line) == sandbox::mojom::Sandbox::kNoSandbox) {
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+ return false;
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+ }
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+
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+ // Unfortunately, it does not appear possible to set RLIMIT_AS such that it
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+ // will both (a) be high enough to support V8's and WebAssembly's address
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+ // space requirements while also (b) being low enough to mitigate exploits
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+ // using integer overflows that require large allocations, heap spray, or
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+ // other memory-hungry attack modes.
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+
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+ *error = sandbox::ResourceLimits::Lower(
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+ RLIMIT_DATA, static_cast<rlim_t>(sandbox::kDataSizeLimit));
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+
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+ // Cache the resource limit before turning on the sandbox.
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+ base::SysInfo::AmountOfVirtualMemory();
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+ base::SysInfo::MaxSharedMemorySize();
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+
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+ return *error == 0;
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+#else
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+ base::SysInfo::AmountOfVirtualMemory();
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+ return false;
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+#endif // !defined(ADDRESS_SANITIZER) && !defined(MEMORY_SANITIZER) &&
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+ // !defined(THREAD_SANITIZER) && !defined(LEAK_SANITIZER)
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+}
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+
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+// static
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+std::string SandboxLinux::GetSandboxTypeInEnglish(sandbox::mojom::Sandbox sandbox_type) {
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+ switch (sandbox_type) {
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+ case sandbox::mojom::Sandbox::kNoSandbox:
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+ return "Unsandboxed";
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+ case sandbox::mojom::Sandbox::kRenderer:
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+ return "Renderer";
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+ case sandbox::mojom::Sandbox::kUtility:
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+ return "Utility";
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+ case sandbox::mojom::Sandbox::kGpu:
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+ return "GPU";
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+#if BUILDFLAG(ENABLE_PPAPI)
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+ case sandbox::mojom::Sandbox::kPpapi:
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+ return "PPAPI";
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+#endif
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+ case sandbox::mojom::Sandbox::kNetwork:
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+ return "Network";
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+ case sandbox::mojom::Sandbox::kCdm:
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+ return "CDM";
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+ case sandbox::mojom::Sandbox::kPrintCompositor:
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+ return "Print Compositor";
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+ case sandbox::mojom::Sandbox::kAudio:
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+ return "Audio";
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+ case sandbox::mojom::Sandbox::kSpeechRecognition:
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+ return "Speech Recognition";
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+ case sandbox::mojom::Sandbox::kService:
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+ return "Service";
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+ case sandbox::mojom::Sandbox::kVideoCapture:
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+ return "Video Capture";
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+ default:
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+ return "Unknown";
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+ }
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+}
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+
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+} // namespace policy
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+} // namespace sandbox
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