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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/user_policy_cache.h"
#include <limits>
#include <string>
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "chrome/browser/policy/enterprise_metrics.h"
#include "chrome/browser/policy/policy_map.h"
#include "chrome/browser/policy/proto/cloud_policy.pb.h"
#include "chrome/browser/policy/proto/device_management_local.pb.h"
#include "chrome/browser/policy/proto/old_generic_format.pb.h"
namespace em = enterprise_management;
namespace policy {
// Decodes a CloudPolicySettings object into a PolicyMap. All the policies will
// be POLICY_SCOPE_USER. The PolicyLevel is decoded from the protobuf.
// The implementation is generated code in policy/cloud_policy_generated.cc.
void DecodePolicy(const em::CloudPolicySettings& policy, PolicyMap* map);
UserPolicyCache::UserPolicyCache(const FilePath& backing_file_path,
bool wait_for_policy_fetch)
: ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
disk_cache_ready_(false),
fetch_ready_(!wait_for_policy_fetch) {
disk_cache_ = new UserPolicyDiskCache(weak_ptr_factory_.GetWeakPtr(),
backing_file_path);
}
UserPolicyCache::~UserPolicyCache() {
}
void UserPolicyCache::Load() {
disk_cache_->Load();
}
bool UserPolicyCache::SetPolicy(const em::PolicyFetchResponse& policy) {
base::Time now = base::Time::NowFromSystemTime();
set_last_policy_refresh_time(now);
base::Time timestamp;
if (!SetPolicyInternal(policy, ×tamp, false))
return false;
UMA_HISTOGRAM_ENUMERATION(kMetricPolicy, kMetricPolicyFetchOK,
kMetricPolicySize);
if (timestamp > base::Time::NowFromSystemTime() +
base::TimeDelta::FromMinutes(1)) {
LOG(WARNING) << "Server returned policy with timestamp from the future, "
"not persisting to disk.";
return false;
}
em::CachedCloudPolicyResponse cached_policy;
cached_policy.mutable_cloud_policy()->CopyFrom(policy);
disk_cache_->Store(cached_policy);
return true;
}
void UserPolicyCache::SetUnmanaged() {
DCHECK(CalledOnValidThread());
SetUnmanagedInternal(base::Time::NowFromSystemTime());
em::CachedCloudPolicyResponse cached_policy;
cached_policy.set_unmanaged(true);
cached_policy.set_timestamp(base::Time::NowFromSystemTime().ToTimeT());
disk_cache_->Store(cached_policy);
}
void UserPolicyCache::SetFetchingDone() {
CloudPolicyCacheBase::SetFetchingDone();
if (!fetch_ready_)
DVLOG(1) << "SetFetchingDone, cache is now fetch_ready_";
fetch_ready_ = true;
CheckIfReady();
}
void UserPolicyCache::OnDiskCacheLoaded(
UserPolicyDiskCache::LoadResult result,
const em::CachedCloudPolicyResponse& cached_response) {
if (IsReady())
return;
if (result == UserPolicyDiskCache::LOAD_RESULT_SUCCESS) {
if (cached_response.unmanaged()) {
SetUnmanagedInternal(base::Time::FromTimeT(cached_response.timestamp()));
} else if (cached_response.has_cloud_policy()) {
base::Time timestamp;
if (SetPolicyInternal(cached_response.cloud_policy(), ×tamp, true))
set_last_policy_refresh_time(timestamp);
}
}
// Ready to feed policy up the chain!
disk_cache_ready_ = true;
CheckIfReady();
}
bool UserPolicyCache::DecodePolicyData(const em::PolicyData& policy_data,
PolicyMap* policies) {
// TODO(jkummerow): Verify policy_data.device_token(). Needs final
// specification which token we're actually sending / expecting to get back.
em::CloudPolicySettings policy;
if (!policy.ParseFromString(policy_data.policy_value())) {
LOG(WARNING) << "Failed to parse CloudPolicySettings protobuf.";
return false;
}
DecodePolicy(policy, policies);
MaybeDecodeOldstylePolicy(policy_data.policy_value(), policies);
return true;
}
void UserPolicyCache::CheckIfReady() {
if (!IsReady() && disk_cache_ready_ && fetch_ready_)
SetReady();
}
// Everything below is only needed for supporting old-style GenericNamedValue
// based policy data and can be removed once this support is no longer needed.
using google::protobuf::RepeatedField;
using google::protobuf::RepeatedPtrField;
void UserPolicyCache::MaybeDecodeOldstylePolicy(
const std::string& policy_data,
PolicyMap* policies) {
// Return immediately if we already have policy information in the maps.
if (!policies->empty())
return;
em::LegacyChromeSettingsProto policy;
// Return if the input string doesn't match the protobuf definition.
if (!policy.ParseFromString(policy_data))
return;
// Return if there's no old-style policy to decode.
if (policy.named_value_size() == 0)
return;
// Inspect GenericNamedValues and decode them.
DictionaryValue result;
RepeatedPtrField<em::GenericNamedValue>::const_iterator named_value;
for (named_value = policy.named_value().begin();
named_value != policy.named_value().end();
++named_value) {
if (named_value->has_value()) {
Value* decoded_value = DecodeValue(named_value->value());
if (decoded_value)
result.Set(named_value->name(), decoded_value);
}
}
policies->LoadFrom(&result, POLICY_LEVEL_MANDATORY, POLICY_SCOPE_USER);
}
Value* UserPolicyCache::DecodeIntegerValue(
google::protobuf::int64 value) const {
if (value < std::numeric_limits<int>::min() ||
value > std::numeric_limits<int>::max()) {
LOG(WARNING) << "Integer value " << value
<< " out of numeric limits, ignoring.";
return NULL;
}
return Value::CreateIntegerValue(static_cast<int>(value));
}
Value* UserPolicyCache::DecodeValue(const em::GenericValue& value) const {
if (!value.has_value_type())
return NULL;
switch (value.value_type()) {
case em::GenericValue::VALUE_TYPE_BOOL:
if (value.has_bool_value())
return Value::CreateBooleanValue(value.bool_value());
return NULL;
case em::GenericValue::VALUE_TYPE_INT64:
if (value.has_int64_value())
return DecodeIntegerValue(value.int64_value());
return NULL;
case em::GenericValue::VALUE_TYPE_STRING:
if (value.has_string_value())
return Value::CreateStringValue(value.string_value());
return NULL;
case em::GenericValue::VALUE_TYPE_DOUBLE:
if (value.has_double_value())
return Value::CreateDoubleValue(value.double_value());
return NULL;
case em::GenericValue::VALUE_TYPE_BYTES:
if (value.has_bytes_value()) {
std::string bytes = value.bytes_value();
return base::BinaryValue::CreateWithCopiedBuffer(bytes.c_str(),
bytes.size());
}
return NULL;
case em::GenericValue::VALUE_TYPE_BOOL_ARRAY: {
ListValue* list = new ListValue;
RepeatedField<bool>::const_iterator i;
for (i = value.bool_array().begin(); i != value.bool_array().end(); ++i)
list->Append(Value::CreateBooleanValue(*i));
return list;
}
case em::GenericValue::VALUE_TYPE_INT64_ARRAY: {
ListValue* list = new ListValue;
RepeatedField<google::protobuf::int64>::const_iterator i;
for (i = value.int64_array().begin();
i != value.int64_array().end(); ++i) {
Value* int_value = DecodeIntegerValue(*i);
if (int_value)
list->Append(int_value);
}
return list;
}
case em::GenericValue::VALUE_TYPE_STRING_ARRAY: {
ListValue* list = new ListValue;
RepeatedPtrField<std::string>::const_iterator i;
for (i = value.string_array().begin();
i != value.string_array().end(); ++i)
list->Append(Value::CreateStringValue(*i));
return list;
}
case em::GenericValue::VALUE_TYPE_DOUBLE_ARRAY: {
ListValue* list = new ListValue;
RepeatedField<double>::const_iterator i;
for (i = value.double_array().begin();
i != value.double_array().end(); ++i)
list->Append(Value::CreateDoubleValue(*i));
return list;
}
default:
NOTREACHED() << "Unhandled value type";
}
return NULL;
}
} // namespace policy
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