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// 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 "chrome/browser/policy/config_dir_policy_loader.h"
#include <algorithm>
#include <set>
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/file_util.h"
#include "base/json/json_file_value_serializer.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/platform_file.h"
#include "base/stl_util.h"
#include "chrome/browser/policy/policy_bundle.h"
#include "chrome/browser/policy/policy_load_status.h"
namespace policy {
namespace {
// Subdirectories that contain the mandatory and recommended policies.
const base::FilePath::CharType kMandatoryConfigDir[] =
FILE_PATH_LITERAL("managed");
const base::FilePath::CharType kRecommendedConfigDir[] =
FILE_PATH_LITERAL("recommended");
PolicyLoadStatus JsonErrorToPolicyLoadStatus(int status) {
switch (status) {
case JSONFileValueSerializer::JSON_ACCESS_DENIED:
case JSONFileValueSerializer::JSON_CANNOT_READ_FILE:
case JSONFileValueSerializer::JSON_FILE_LOCKED:
return POLICY_LOAD_STATUS_READ_ERROR;
case JSONFileValueSerializer::JSON_NO_SUCH_FILE:
return POLICY_LOAD_STATUS_MISSING;
case base::JSONReader::JSON_INVALID_ESCAPE:
case base::JSONReader::JSON_SYNTAX_ERROR:
case base::JSONReader::JSON_UNEXPECTED_TOKEN:
case base::JSONReader::JSON_TRAILING_COMMA:
case base::JSONReader::JSON_TOO_MUCH_NESTING:
case base::JSONReader::JSON_UNEXPECTED_DATA_AFTER_ROOT:
case base::JSONReader::JSON_UNSUPPORTED_ENCODING:
case base::JSONReader::JSON_UNQUOTED_DICTIONARY_KEY:
return POLICY_LOAD_STATUS_PARSE_ERROR;
case base::JSONReader::JSON_NO_ERROR:
NOTREACHED();
return POLICY_LOAD_STATUS_STARTED;
}
NOTREACHED() << "Invalid status " << status;
return POLICY_LOAD_STATUS_PARSE_ERROR;
}
} // namespace
ConfigDirPolicyLoader::ConfigDirPolicyLoader(const base::FilePath& config_dir,
PolicyScope scope)
: config_dir_(config_dir),
scope_(scope) {}
ConfigDirPolicyLoader::~ConfigDirPolicyLoader() {}
void ConfigDirPolicyLoader::InitOnFile() {
base::FilePathWatcher::Callback callback =
base::Bind(&ConfigDirPolicyLoader::OnFileUpdated, base::Unretained(this));
mandatory_watcher_.Watch(config_dir_.Append(kMandatoryConfigDir), false,
callback);
recommended_watcher_.Watch(config_dir_.Append(kRecommendedConfigDir), false,
callback);
}
scoped_ptr<PolicyBundle> ConfigDirPolicyLoader::Load() {
scoped_ptr<PolicyBundle> bundle(new PolicyBundle());
LoadFromPath(config_dir_.Append(kMandatoryConfigDir),
POLICY_LEVEL_MANDATORY,
bundle.get());
LoadFromPath(config_dir_.Append(kRecommendedConfigDir),
POLICY_LEVEL_RECOMMENDED,
bundle.get());
return bundle.Pass();
}
base::Time ConfigDirPolicyLoader::LastModificationTime() {
static const base::FilePath::CharType* kConfigDirSuffixes[] = {
kMandatoryConfigDir,
kRecommendedConfigDir,
};
base::Time last_modification = base::Time();
base::PlatformFileInfo info;
for (size_t i = 0; i < arraysize(kConfigDirSuffixes); ++i) {
base::FilePath path(config_dir_.Append(kConfigDirSuffixes[i]));
// Skip if the file doesn't exist, or it isn't a directory.
if (!file_util::GetFileInfo(path, &info) || !info.is_directory)
continue;
// Enumerate the files and find the most recent modification timestamp.
file_util::FileEnumerator file_enumerator(path, false,
file_util::FileEnumerator::FILES);
for (base::FilePath config_file = file_enumerator.Next();
!config_file.empty();
config_file = file_enumerator.Next()) {
if (file_util::GetFileInfo(config_file, &info) && !info.is_directory)
last_modification = std::max(last_modification, info.last_modified);
}
}
return last_modification;
}
void ConfigDirPolicyLoader::LoadFromPath(const base::FilePath& path,
PolicyLevel level,
PolicyBundle* bundle) {
// Enumerate the files and sort them lexicographically.
std::set<base::FilePath> files;
file_util::FileEnumerator file_enumerator(path, false,
file_util::FileEnumerator::FILES);
for (base::FilePath config_file_path = file_enumerator.Next();
!config_file_path.empty(); config_file_path = file_enumerator.Next())
files.insert(config_file_path);
PolicyLoadStatusSample status;
if (files.empty()) {
status.Add(POLICY_LOAD_STATUS_NO_POLICY);
return;
}
// Start with an empty dictionary and merge the files' contents.
// The files are processed in reverse order because |MergeFrom| gives priority
// to existing keys, but the ConfigDirPolicyProvider gives priority to the
// last file in lexicographic order.
for (std::set<base::FilePath>::reverse_iterator config_file_iter =
files.rbegin(); config_file_iter != files.rend();
++config_file_iter) {
JSONFileValueSerializer deserializer(*config_file_iter);
deserializer.set_allow_trailing_comma(true);
int error_code = 0;
std::string error_msg;
scoped_ptr<base::Value> value(
deserializer.Deserialize(&error_code, &error_msg));
if (!value.get()) {
LOG(WARNING) << "Failed to read configuration file "
<< config_file_iter->value() << ": " << error_msg;
status.Add(JsonErrorToPolicyLoadStatus(error_code));
continue;
}
base::DictionaryValue* dictionary_value = NULL;
if (!value->GetAsDictionary(&dictionary_value)) {
LOG(WARNING) << "Expected JSON dictionary in configuration file "
<< config_file_iter->value();
status.Add(POLICY_LOAD_STATUS_PARSE_ERROR);
continue;
}
// Detach the "3rdparty" node.
base::Value* third_party = NULL;
if (dictionary_value->Remove("3rdparty", &third_party)) {
Merge3rdPartyPolicy(third_party, level, bundle);
delete third_party;
}
// Add chrome policy.
PolicyMap policy_map;
policy_map.LoadFrom(dictionary_value, level, scope_);
bundle->Get(PolicyNamespace(POLICY_DOMAIN_CHROME, std::string()))
.MergeFrom(policy_map);
}
}
void ConfigDirPolicyLoader::Merge3rdPartyPolicy(
const base::Value* policies,
PolicyLevel level,
PolicyBundle* bundle) {
// The first-level entries in |policies| are PolicyDomains. The second-level
// entries are component IDs, and the third-level entries are the policies
// for that domain/component namespace.
const base::DictionaryValue* domains_dictionary;
if (!policies->GetAsDictionary(&domains_dictionary)) {
LOG(WARNING) << "3rdparty value is not a dictionary!";
return;
}
// Helper to lookup a domain given its string name.
std::map<std::string, PolicyDomain> supported_domains;
supported_domains["extensions"] = POLICY_DOMAIN_EXTENSIONS;
for (base::DictionaryValue::Iterator domains_it(*domains_dictionary);
!domains_it.IsAtEnd(); domains_it.Advance()) {
if (!ContainsKey(supported_domains, domains_it.key())) {
LOG(WARNING) << "Unsupported 3rd party policy domain: "
<< domains_it.key();
continue;
}
const base::DictionaryValue* components_dictionary;
if (!domains_it.value().GetAsDictionary(&components_dictionary)) {
LOG(WARNING) << "3rdparty/" << domains_it.key()
<< " value is not a dictionary!";
continue;
}
PolicyDomain domain = supported_domains[domains_it.key()];
for (base::DictionaryValue::Iterator components_it(*components_dictionary);
!components_it.IsAtEnd(); components_it.Advance()) {
const base::DictionaryValue* policy_dictionary;
if (!components_it.value().GetAsDictionary(&policy_dictionary)) {
LOG(WARNING) << "3rdparty/" << domains_it.key() << "/"
<< components_it.key() << " value is not a dictionary!";
continue;
}
PolicyMap policy;
policy.LoadFrom(policy_dictionary, level, scope_);
bundle->Get(PolicyNamespace(domain, components_it.key()))
.MergeFrom(policy);
}
}
}
void ConfigDirPolicyLoader::OnFileUpdated(const base::FilePath& path,
bool error) {
if (!error)
Reload(false);
}
} // namespace policy
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