//
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// Copyright (C) 2017 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/update_manager/enterprise_device_policy_impl.h"
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#include "update_engine/common/utils.h"
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using std::string;
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namespace chromeos_update_manager {
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// Check to see if Enterprise-managed (has DevicePolicy) and/or Kiosk-mode. If
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// so, then defer to those settings.
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EvalStatus EnterpriseDevicePolicyImpl::UpdateCheckAllowed(
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EvaluationContext* ec,
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State* state,
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std::string* error,
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UpdateCheckParams* result) const {
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DevicePolicyProvider* const dp_provider = state->device_policy_provider();
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SystemProvider* const system_provider = state->system_provider();
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const bool* device_policy_is_loaded_p =
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ec->GetValue(dp_provider->var_device_policy_is_loaded());
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if (device_policy_is_loaded_p && *device_policy_is_loaded_p) {
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bool kiosk_app_control_chrome_version = false;
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// Check whether updates are disabled by policy.
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const bool* update_disabled_p =
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ec->GetValue(dp_provider->var_update_disabled());
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if (update_disabled_p && *update_disabled_p) {
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// Check whether allow kiosk app to control chrome version policy. This
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// policy is only effective when AU is disabled by admin.
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const bool* allow_kiosk_app_control_chrome_version_p = ec->GetValue(
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dp_provider->var_allow_kiosk_app_control_chrome_version());
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kiosk_app_control_chrome_version =
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allow_kiosk_app_control_chrome_version_p &&
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*allow_kiosk_app_control_chrome_version_p;
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if (!kiosk_app_control_chrome_version) {
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// No kiosk pin chrome version policy. AU is really disabled.
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LOG(INFO) << "Updates disabled by policy, blocking update checks.";
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return EvalStatus::kAskMeAgainLater;
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}
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}
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// By default, result->rollback_allowed is false.
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if (kiosk_app_control_chrome_version) {
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// Get the required platform version from Chrome.
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const string* kiosk_required_platform_version_p =
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ec->GetValue(system_provider->var_kiosk_required_platform_version());
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if (!kiosk_required_platform_version_p) {
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LOG(INFO) << "Kiosk app required platform version is not fetched, "
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"blocking update checks";
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return EvalStatus::kAskMeAgainLater;
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}
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result->target_version_prefix = *kiosk_required_platform_version_p;
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LOG(INFO) << "Allow kiosk app to control Chrome version policy is set, "
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<< "target version is " << result->target_version_prefix;
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// TODO(hunyadym): Add support for allowing rollback using the manifest
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// (if policy doesn't specify otherwise).
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} else {
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// Determine whether a target version prefix is dictated by policy.
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const string* target_version_prefix_p =
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ec->GetValue(dp_provider->var_target_version_prefix());
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if (target_version_prefix_p)
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result->target_version_prefix = *target_version_prefix_p;
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}
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// Policy always overwrites whether rollback is allowed by the kiosk app
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// manifest.
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const RollbackToTargetVersion* rollback_to_target_version_p =
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ec->GetValue(dp_provider->var_rollback_to_target_version());
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if (rollback_to_target_version_p) {
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switch (*rollback_to_target_version_p) {
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case RollbackToTargetVersion::kUnspecified:
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// We leave the default or the one specified by the kiosk app.
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break;
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case RollbackToTargetVersion::kDisabled:
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LOG(INFO) << "Policy disables rollbacks.";
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result->rollback_allowed = false;
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break;
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case RollbackToTargetVersion::kRollbackAndPowerwash:
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LOG(INFO) << "Policy allows rollbacks with powerwash.";
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result->rollback_allowed = true;
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break;
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case RollbackToTargetVersion::kRollbackAndRestoreIfPossible:
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LOG(INFO)
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<< "Policy allows rollbacks, also tries to restore if possible.";
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// We don't support restore yet, but policy still allows rollback.
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result->rollback_allowed = true;
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break;
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case RollbackToTargetVersion::kRollbackOnlyIfRestorePossible:
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LOG(INFO) << "Policy only allows rollbacks if restore is possible.";
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// We don't support restore yet, policy doesn't allow rollback in this
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// case.
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result->rollback_allowed = false;
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break;
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case RollbackToTargetVersion::kMaxValue:
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NOTREACHED();
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// Don't add a default case to let the compiler warn about newly
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// added enum values which should be added here.
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}
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}
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// Determine allowed milestones for rollback
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const int* rollback_allowed_milestones_p =
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ec->GetValue(dp_provider->var_rollback_allowed_milestones());
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if (rollback_allowed_milestones_p)
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result->rollback_allowed_milestones = *rollback_allowed_milestones_p;
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// Determine whether a target channel is dictated by policy.
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const bool* release_channel_delegated_p =
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ec->GetValue(dp_provider->var_release_channel_delegated());
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if (release_channel_delegated_p && !(*release_channel_delegated_p)) {
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const string* release_channel_p =
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ec->GetValue(dp_provider->var_release_channel());
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if (release_channel_p)
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result->target_channel = *release_channel_p;
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}
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}
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return EvalStatus::kContinue;
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}
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} // namespace chromeos_update_manager
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