Merge from Chromium at DEPS revision r167172
This commit was generated by merge_to_master.py.
Change-Id: Ib8d56fd5ae39a2d7e8c91dcd76cc6d13f25f2aab
diff --git a/sandbox/linux/suid/client/setuid_sandbox_client.cc b/sandbox/linux/suid/client/setuid_sandbox_client.cc
new file mode 100644
index 0000000..45d700b
--- /dev/null
+++ b/sandbox/linux/suid/client/setuid_sandbox_client.cc
@@ -0,0 +1,179 @@
+// Copyright (c) 2012 The Chromium 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 <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "base/eintr_wrapper.h"
+#include "base/environment.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string_number_conversions.h"
+
+#include "sandbox/linux/suid/common/sandbox.h"
+#include "sandbox/linux/suid/common/suid_unsafe_environment_variables.h"
+#include "setuid_sandbox_client.h"
+
+namespace {
+
+// Set an environment variable that reflects the API version we expect from the
+// setuid sandbox. Old versions of the sandbox will ignore this.
+void SetSandboxAPIEnvironmentVariable(base::Environment* env) {
+ env->SetVar(sandbox::kSandboxEnvironmentApiRequest,
+ base::IntToString(sandbox::kSUIDSandboxApiNumber));
+}
+
+// Wrapper around a shared C function.
+// Returns the "saved" environment variable name corresponding to |envvar|
+// in a new string or NULL.
+std::string* CreateSavedVariableName(const char* env_var) {
+ char* const saved_env_var = SandboxSavedEnvironmentVariable(env_var);
+ if (!saved_env_var)
+ return NULL;
+ std::string* saved_env_var_copy = new std::string(saved_env_var);
+ // SandboxSavedEnvironmentVariable is the C function that we wrap and uses
+ // malloc() to allocate memory.
+ free(saved_env_var);
+ return saved_env_var_copy;
+}
+
+// The ELF loader will clear many environment variables so we save them to
+// different names here so that the SUID sandbox can resolve them for the
+// renderer.
+void SaveSUIDUnsafeEnvironmentVariables(base::Environment* env) {
+ for (unsigned i = 0; kSUIDUnsafeEnvironmentVariables[i]; ++i) {
+ const char* env_var = kSUIDUnsafeEnvironmentVariables[i];
+ // Get the saved environment variable corresponding to envvar.
+ scoped_ptr<std::string> saved_env_var(CreateSavedVariableName(env_var));
+ if (saved_env_var == NULL)
+ continue;
+
+ std::string value;
+ if (env->GetVar(env_var, &value))
+ env->SetVar(saved_env_var->c_str(), value);
+ else
+ env->UnSetVar(saved_env_var->c_str());
+ }
+}
+
+int GetHelperApi(base::Environment* env) {
+ std::string api_string;
+ int api_number = 0; // Assume API version 0 if no environment was found.
+ if (env->GetVar(sandbox::kSandboxEnvironmentApiProvides, &api_string) &&
+ !base::StringToInt(api_string, &api_number)) {
+ // It's an error if we could not convert the API number.
+ api_number = -1;
+ }
+ return api_number;
+}
+
+// Convert |var_name| from the environment |env| to an int.
+// Return -1 if the variable does not exist or the value cannot be converted.
+int EnvToInt(base::Environment* env, const char* var_name) {
+ std::string var_string;
+ int var_value = -1;
+ if (env->GetVar(var_name, &var_string) &&
+ !base::StringToInt(var_string, &var_value)) {
+ var_value = -1;
+ }
+ return var_value;
+}
+
+pid_t GetHelperPID(base::Environment* env) {
+ return EnvToInt(env, sandbox::kSandboxHelperPidEnvironmentVarName);
+}
+
+// Get the IPC file descriptor used to communicate with the setuid helper.
+int GetIPCDescriptor(base::Environment* env) {
+ return EnvToInt(env, sandbox::kSandboxDescriptorEnvironmentVarName);
+}
+
+} // namespace
+
+namespace sandbox {
+
+SetuidSandboxClient* SetuidSandboxClient::Create() {
+ base::Environment* environment(base::Environment::Create());
+ SetuidSandboxClient* sandbox_client(new(SetuidSandboxClient));
+
+ CHECK(environment);
+ sandbox_client->env_ = environment;
+ return sandbox_client;
+}
+
+SetuidSandboxClient::SetuidSandboxClient()
+ : env_(NULL),
+ sandboxed_(false) {
+}
+
+SetuidSandboxClient::~SetuidSandboxClient() {
+ delete env_;
+}
+
+bool SetuidSandboxClient::ChrootMe() {
+ int ipc_fd = GetIPCDescriptor(env_);
+
+ if (ipc_fd < 0) {
+ LOG(ERROR) << "Failed to obtain the sandbox IPC descriptor";
+ return false;
+ }
+
+ if (HANDLE_EINTR(write(ipc_fd, &kMsgChrootMe, 1)) != 1) {
+ PLOG(ERROR) << "Failed to write to chroot pipe";
+ return false;
+ }
+
+ // We need to reap the chroot helper process in any event.
+ pid_t helper_pid = GetHelperPID(env_);
+ // If helper_pid is -1 we wait for any child.
+ if (waitpid(helper_pid, NULL, 0) < 0) {
+ PLOG(ERROR) << "Failed to wait for setuid helper to die";
+ return false;
+ }
+
+ char reply;
+ if (HANDLE_EINTR(read(ipc_fd, &reply, 1)) != 1) {
+ PLOG(ERROR) << "Failed to read from chroot pipe";
+ return false;
+ }
+
+ if (reply != kMsgChrootSuccessful) {
+ LOG(ERROR) << "Error code reply from chroot helper";
+ return false;
+ }
+
+ // We now consider ourselves "fully sandboxed" as far as the
+ // setuid sandbox is concerned.
+ sandboxed_ = true;
+ return true;
+}
+
+bool SetuidSandboxClient::IsSuidSandboxUpToDate() const {
+ return GetHelperApi(env_) == kSUIDSandboxApiNumber;
+}
+
+bool SetuidSandboxClient::IsSuidSandboxChild() const {
+ return GetIPCDescriptor(env_) >= 0;
+}
+
+bool SetuidSandboxClient::IsInNewPIDNamespace() const {
+ return env_->HasVar(kSandboxPIDNSEnvironmentVarName);
+}
+
+bool SetuidSandboxClient::IsInNewNETNamespace() const {
+ return env_->HasVar(kSandboxNETNSEnvironmentVarName);
+}
+
+bool SetuidSandboxClient::IsSandboxed() const {
+ return sandboxed_;
+}
+
+void SetuidSandboxClient::SetupLaunchEnvironment() {
+ SaveSUIDUnsafeEnvironmentVariables(env_);
+ SetSandboxAPIEnvironmentVariable(env_);
+}
+
+} // namespace sandbox
+