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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include <pwd.h>
#include <stddef.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "chrome/browser/policy/policy_path_parser.h"
#include "base/logging.h"
namespace policy {
namespace path_parser {
const char kMachineNamePolicyVarName[] = "${machine_name}";
const char kUserNamePolicyVarName[] = "${user_name}";
// Replaces all variable occurrences in the policy string with the respective
// system settings values.
base::FilePath::StringType ExpandPathVariables(
const base::FilePath::StringType& untranslated_string) {
base::FilePath::StringType result(untranslated_string);
if (result.length() == 0)
return result;
// Sanitize quotes in case of any around the whole string.
if (result.length() > 1 &&
((result.front() == '"' && result.back() == '"') ||
(result.front() == '\'' && result.back() == '\''))) {
// Strip first and last char which should be matching quotes now.
result = result.substr(1, result.length() - 2);
}
// Translate two special variables ${user_name} and ${machine_name}
size_t position = result.find(kUserNamePolicyVarName);
if (position != std::string::npos) {
struct passwd* user = getpwuid(geteuid());
if (user && user->pw_name) {
result.replace(position, strlen(kUserNamePolicyVarName), user->pw_name);
} else {
LOG(ERROR) << "Username variable can not be resolved. ";
}
}
position = result.find(kMachineNamePolicyVarName);
if (position != std::string::npos) {
// Receive result into a zero-initialized vector with one extra byte, as
// POSIX doesn't guarantee a specific behavior about the terminating null
// character in case of truncation.
std::vector<char> machinename(256);
if (gethostname(machinename.data(), machinename.size() - 1) == 0) {
result.replace(position, strlen(kMachineNamePolicyVarName),
machinename.data());
} else {
LOG(ERROR) << "Machine name variable can not be resolved.";
}
}
return result;
}
} // namespace path_parser
} // namespace policy
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