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//
// Copyright (C) 2012 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "update_engine/omaha_request_action.h"
#include <inttypes.h>
#include <limits>
#include <map>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
#include <base/bind.h>
#include <base/logging.h>
#include <base/rand_util.h>
#include <base/strings/string_number_conversions.h>
#include <base/strings/string_split.h>
#include <base/strings/string_util.h>
#include <base/strings/stringprintf.h>
#include <base/time/time.h>
#include <brillo/key_value_store.h>
#include <expat.h>
#include <metrics/metrics_library.h>
#include <policy/libpolicy.h>
#include "update_engine/common/action_pipe.h"
#include "update_engine/common/constants.h"
#include "update_engine/common/hardware_interface.h"
#include "update_engine/common/hash_calculator.h"
#include "update_engine/common/platform_constants.h"
#include "update_engine/common/prefs_interface.h"
#include "update_engine/common/utils.h"
#include "update_engine/connection_manager_interface.h"
#include "update_engine/metrics_reporter_interface.h"
#include "update_engine/metrics_utils.h"
#include "update_engine/omaha_request_builder_xml.h"
#include "update_engine/omaha_request_params.h"
#include "update_engine/p2p_manager.h"
#include "update_engine/payload_state_interface.h"
using base::Time;
using base::TimeDelta;
using chromeos_update_manager::kRollforwardInfinity;
using std::map;
using std::numeric_limits;
using std::string;
using std::vector;
namespace chromeos_update_engine {
// List of custom attributes that we interpret in the Omaha response:
constexpr char kAttrDeadline[] = "deadline";
constexpr char kAttrDisableP2PForDownloading[] = "DisableP2PForDownloading";
constexpr char kAttrDisableP2PForSharing[] = "DisableP2PForSharing";
constexpr char kAttrDisablePayloadBackoff[] = "DisablePayloadBackoff";
constexpr char kAttrVersion[] = "version";
// Deprecated: "IsDelta"
constexpr char kAttrIsDeltaPayload[] = "IsDeltaPayload";
constexpr char kAttrMaxFailureCountPerUrl[] = "MaxFailureCountPerUrl";
constexpr char kAttrMaxDaysToScatter[] = "MaxDaysToScatter";
// Deprecated: "ManifestSignatureRsa"
// Deprecated: "ManifestSize"
constexpr char kAttrMetadataSignatureRsa[] = "MetadataSignatureRsa";
constexpr char kAttrMetadataSize[] = "MetadataSize";
constexpr char kAttrMoreInfo[] = "MoreInfo";
constexpr char kAttrNoUpdate[] = "noupdate";
// Deprecated: "NeedsAdmin"
constexpr char kAttrPollInterval[] = "PollInterval";
constexpr char kAttrPowerwash[] = "Powerwash";
constexpr char kAttrPrompt[] = "Prompt";
constexpr char kAttrPublicKeyRsa[] = "PublicKeyRsa";
// List of attributes that we interpret in the Omaha response:
constexpr char kAttrAppId[] = "appid";
constexpr char kAttrCodeBase[] = "codebase";
constexpr char kAttrCohort[] = "cohort";
constexpr char kAttrCohortHint[] = "cohorthint";
constexpr char kAttrCohortName[] = "cohortname";
constexpr char kAttrElapsedDays[] = "elapsed_days";
constexpr char kAttrElapsedSeconds[] = "elapsed_seconds";
constexpr char kAttrEvent[] = "event";
constexpr char kAttrHashSha256[] = "hash_sha256";
// Deprecated: "hash"; Although we still need to pass it from the server for
// backward compatibility.
constexpr char kAttrName[] = "name";
// Deprecated: "sha256"; Although we still need to pass it from the server for
// backward compatibility.
constexpr char kAttrSize[] = "size";
constexpr char kAttrStatus[] = "status";
// List of values that we interpret in the Omaha response:
constexpr char kValPostInstall[] = "postinstall";
constexpr char kValNoUpdate[] = "noupdate";
// X-Goog-Update headers.
constexpr char kXGoogleUpdateInteractivity[] = "X-Goog-Update-Interactivity";
constexpr char kXGoogleUpdateAppId[] = "X-Goog-Update-AppId";
constexpr char kXGoogleUpdateUpdater[] = "X-Goog-Update-Updater";
// updatecheck attributes (without the underscore prefix).
constexpr char kAttrEol[] = "eol";
constexpr char kAttrRollback[] = "rollback";
constexpr char kAttrFirmwareVersion[] = "firmware_version";
constexpr char kAttrKernelVersion[] = "kernel_version";
// Struct used for holding data obtained when parsing the XML.
struct OmahaParserData {
explicit OmahaParserData(XML_Parser _xml_parser) : xml_parser(_xml_parser) {}
// Pointer to the expat XML_Parser object.
XML_Parser xml_parser;
// This is the state of the parser as it's processing the XML.
bool failed = false;
bool entity_decl = false;
string current_path;
// These are the values extracted from the XML.
string updatecheck_poll_interval;
map<string, string> updatecheck_attrs;
string daystart_elapsed_days;
string daystart_elapsed_seconds;
struct App {
string id;
vector<string> url_codebase;
string manifest_version;
map<string, string> action_postinstall_attrs;
string updatecheck_status;
string cohort;
string cohorthint;
string cohortname;
bool cohort_set = false;
bool cohorthint_set = false;
bool cohortname_set = false;
struct Package {
string name;
string size;
string hash;
};
vector<Package> packages;
};
vector<App> apps;
};
namespace {
// Callback function invoked by expat.
void ParserHandlerStart(void* user_data,
const XML_Char* element,
const XML_Char** attr) {
OmahaParserData* data = reinterpret_cast<OmahaParserData*>(user_data);
if (data->failed)
return;
data->current_path += string("/") + element;
map<string, string> attrs;
if (attr != nullptr) {
for (int n = 0; attr[n] != nullptr && attr[n + 1] != nullptr; n += 2) {
string key = attr[n];
string value = attr[n + 1];
attrs[key] = value;
}
}
if (data->current_path == "/response/app") {
OmahaParserData::App app;
if (attrs.find(kAttrAppId) != attrs.end()) {
app.id = attrs[kAttrAppId];
}
if (attrs.find(kAttrCohort) != attrs.end()) {
app.cohort_set = true;
app.cohort = attrs[kAttrCohort];
}
if (attrs.find(kAttrCohortHint) != attrs.end()) {
app.cohorthint_set = true;
app.cohorthint = attrs[kAttrCohortHint];
}
if (attrs.find(kAttrCohortName) != attrs.end()) {
app.cohortname_set = true;
app.cohortname = attrs[kAttrCohortName];
}
data->apps.push_back(std::move(app));
} else if (data->current_path == "/response/app/updatecheck") {
if (!data->apps.empty())
data->apps.back().updatecheck_status = attrs[kAttrStatus];
if (data->updatecheck_poll_interval.empty())
data->updatecheck_poll_interval = attrs[kAttrPollInterval];
// Omaha sends arbitrary key-value pairs as extra attributes starting with
// an underscore.
for (const auto& attr : attrs) {
if (!attr.first.empty() && attr.first[0] == '_')
data->updatecheck_attrs[attr.first.substr(1)] = attr.second;
}
} else if (data->current_path == "/response/daystart") {
// Get the install-date.
data->daystart_elapsed_days = attrs[kAttrElapsedDays];
data->daystart_elapsed_seconds = attrs[kAttrElapsedSeconds];
} else if (data->current_path == "/response/app/updatecheck/urls/url") {
// Look at all <url> elements.
if (!data->apps.empty())
data->apps.back().url_codebase.push_back(attrs[kAttrCodeBase]);
} else if (data->current_path ==
"/response/app/updatecheck/manifest/packages/package") {
// Look at all <package> elements.
if (!data->apps.empty())
data->apps.back().packages.push_back({.name = attrs[kAttrName],
.size = attrs[kAttrSize],
.hash = attrs[kAttrHashSha256]});
} else if (data->current_path == "/response/app/updatecheck/manifest") {
// Get the version.
if (!data->apps.empty())
data->apps.back().manifest_version = attrs[kAttrVersion];
} else if (data->current_path ==
"/response/app/updatecheck/manifest/actions/action") {
// We only care about the postinstall action.
if (attrs[kAttrEvent] == kValPostInstall && !data->apps.empty()) {
data->apps.back().action_postinstall_attrs = std::move(attrs);
}
}
}
// Callback function invoked by expat.
void ParserHandlerEnd(void* user_data, const XML_Char* element) {
OmahaParserData* data = reinterpret_cast<OmahaParserData*>(user_data);
if (data->failed)
return;
const string path_suffix = string("/") + element;
if (!base::EndsWith(
data->current_path, path_suffix, base::CompareCase::SENSITIVE)) {
LOG(ERROR) << "Unexpected end element '" << element
<< "' with current_path='" << data->current_path << "'";
data->failed = true;
return;
}
data->current_path.resize(data->current_path.size() - path_suffix.size());
}
// Callback function invoked by expat.
//
// This is called for entity declarations. Since Omaha is guaranteed
// to never return any XML with entities our course of action is to
// just stop parsing. This avoids potential resource exhaustion
// problems AKA the "billion laughs". CVE-2013-0340.
void ParserHandlerEntityDecl(void* user_data,
const XML_Char* entity_name,
int is_parameter_entity,
const XML_Char* value,
int value_length,
const XML_Char* base,
const XML_Char* system_id,
const XML_Char* public_id,
const XML_Char* notation_name) {
OmahaParserData* data = reinterpret_cast<OmahaParserData*>(user_data);
LOG(ERROR) << "XML entities are not supported. Aborting parsing.";
data->failed = true;
data->entity_decl = true;
XML_StopParser(data->xml_parser, false);
}
} // namespace
OmahaRequestAction::OmahaRequestAction(
SystemState* system_state,
OmahaEvent* event,
std::unique_ptr<HttpFetcher> http_fetcher,
bool ping_only)
: system_state_(system_state),
params_(system_state->request_params()),
event_(event),
http_fetcher_(std::move(http_fetcher)),
policy_provider_(std::make_unique<policy::PolicyProvider>()),
ping_only_(ping_only),
ping_active_days_(0),
ping_roll_call_days_(0) {
policy_provider_->Reload();
}
OmahaRequestAction::~OmahaRequestAction() {}
// Calculates the value to use for the ping days parameter.
int OmahaRequestAction::CalculatePingDays(const string& key) {
int days = kNeverPinged;
int64_t last_ping = 0;
if (system_state_->prefs()->GetInt64(key, &last_ping) && last_ping >= 0) {
days = (Time::Now() - Time::FromInternalValue(last_ping)).InDays();
if (days < 0) {
// If |days| is negative, then the system clock must have jumped
// back in time since the ping was sent. Mark the value so that
// it doesn't get sent to the server but we still update the
// last ping daystart preference. This way the next ping time
// will be correct, hopefully.
days = kPingTimeJump;
LOG(WARNING)
<< "System clock jumped back in time. Resetting ping daystarts.";
}
}
return days;
}
void OmahaRequestAction::InitPingDays() {
// We send pings only along with update checks, not with events.
if (IsEvent()) {
return;
}
// TODO(petkov): Figure a way to distinguish active use pings
// vs. roll call pings. Currently, the two pings are identical. A
// fix needs to change this code as well as UpdateLastPingDays and ShouldPing.
ping_active_days_ = CalculatePingDays(kPrefsLastActivePingDay);
ping_roll_call_days_ = CalculatePingDays(kPrefsLastRollCallPingDay);
}
bool OmahaRequestAction::ShouldPing() const {
if (ping_active_days_ == kNeverPinged &&
ping_roll_call_days_ == kNeverPinged) {
int powerwash_count = system_state_->hardware()->GetPowerwashCount();
if (powerwash_count > 0) {
LOG(INFO) << "Not sending ping with a=-1 r=-1 to omaha because "
<< "powerwash_count is " << powerwash_count;
return false;
}
if (system_state_->hardware()->GetFirstActiveOmahaPingSent()) {
LOG(INFO) << "Not sending ping with a=-1 r=-1 to omaha because "
<< "the first_active_omaha_ping_sent is true";
return false;
}
return true;
}
return ping_active_days_ > 0 || ping_roll_call_days_ > 0;
}
// static
int OmahaRequestAction::GetInstallDate(SystemState* system_state) {
PrefsInterface* prefs = system_state->prefs();
if (prefs == nullptr)
return -1;
// If we have the value stored on disk, just return it.
int64_t stored_value;
if (prefs->GetInt64(kPrefsInstallDateDays, &stored_value)) {
// Convert and sanity-check.
int install_date_days = static_cast<int>(stored_value);
if (install_date_days >= 0)
return install_date_days;
LOG(ERROR) << "Dropping stored Omaha InstallData since its value num_days="
<< install_date_days << " looks suspicious.";
prefs->Delete(kPrefsInstallDateDays);
}
// Otherwise, if OOBE is not complete then do nothing and wait for
// ParseResponse() to call ParseInstallDate() and then
// PersistInstallDate() to set the kPrefsInstallDateDays state
// variable. Once that is done, we'll then report back in future
// Omaha requests. This works exactly because OOBE triggers an
// update check.
//
// However, if OOBE is complete and the kPrefsInstallDateDays state
// variable is not set, there are two possibilities
//
// 1. The update check in OOBE failed so we never got a response
// from Omaha (no network etc.); or
//
// 2. OOBE was done on an older version that didn't write to the
// kPrefsInstallDateDays state variable.
//
// In both cases, we approximate the install date by simply
// inspecting the timestamp of when OOBE happened.
Time time_of_oobe;
if (!system_state->hardware()->IsOOBEEnabled() ||
!system_state->hardware()->IsOOBEComplete(&time_of_oobe)) {
LOG(INFO) << "Not generating Omaha InstallData as we have "
<< "no prefs file and OOBE is not complete or not enabled.";
return -1;
}
int num_days;
if (!utils::ConvertToOmahaInstallDate(time_of_oobe, &num_days)) {
LOG(ERROR) << "Not generating Omaha InstallData from time of OOBE "
<< "as its value '" << utils::ToString(time_of_oobe)
<< "' looks suspicious.";
return -1;
}
// Persist this to disk, for future use.
if (!OmahaRequestAction::PersistInstallDate(
system_state, num_days, kProvisionedFromOOBEMarker))
return -1;
LOG(INFO) << "Set the Omaha InstallDate from OOBE time-stamp to " << num_days
<< " days";
return num_days;
}
void OmahaRequestAction::PerformAction() {
http_fetcher_->set_delegate(this);
InitPingDays();
if (ping_only_ && !ShouldPing()) {
processor_->ActionComplete(this, ErrorCode::kSuccess);
return;
}
string request_post(GetRequestXml(event_.get(),
params_,
ping_only_,
ShouldPing(), // include_ping
ping_active_days_,
ping_roll_call_days_,
GetInstallDate(system_state_),
system_state_));
// Set X-Goog-Update headers.
http_fetcher_->SetHeader(kXGoogleUpdateInteractivity,
params_->interactive() ? "fg" : "bg");
http_fetcher_->SetHeader(kXGoogleUpdateAppId, params_->GetAppId());
http_fetcher_->SetHeader(
kXGoogleUpdateUpdater,
base::StringPrintf(
"%s-%s", constants::kOmahaUpdaterID, kOmahaUpdaterVersion));
http_fetcher_->SetPostData(
request_post.data(), request_post.size(), kHttpContentTypeTextXml);
LOG(INFO) << "Posting an Omaha request to " << params_->update_url();
LOG(INFO) << "Request: " << request_post;
http_fetcher_->BeginTransfer(params_->update_url());
}
void OmahaRequestAction::TerminateProcessing() {
http_fetcher_->TerminateTransfer();
}
// We just store the response in the buffer. Once we've received all bytes,
// we'll look in the buffer and decide what to do.
bool OmahaRequestAction::ReceivedBytes(HttpFetcher* fetcher,
const void* bytes,
size_t length) {
const uint8_t* byte_ptr = reinterpret_cast<const uint8_t*>(bytes);
response_buffer_.insert(response_buffer_.end(), byte_ptr, byte_ptr + length);
return true;
}
namespace {
// Parses a 64 bit base-10 int from a string and returns it. Returns 0
// on error. If the string contains "0", that's indistinguishable from
// error.
off_t ParseInt(const string& str) {
off_t ret = 0;
int rc = sscanf(str.c_str(), "%" PRIi64, &ret); // NOLINT(runtime/printf)
if (rc < 1) {
// failure
return 0;
}
return ret;
}
// Parses |str| and returns |true| if, and only if, its value is "true".
bool ParseBool(const string& str) {
return str == "true";
}
// Update the last ping day preferences based on the server daystart
// response. Returns true on success, false otherwise.
bool UpdateLastPingDays(OmahaParserData* parser_data, PrefsInterface* prefs) {
int64_t elapsed_seconds = 0;
TEST_AND_RETURN_FALSE(base::StringToInt64(
parser_data->daystart_elapsed_seconds, &elapsed_seconds));
TEST_AND_RETURN_FALSE(elapsed_seconds >= 0);
// Remember the local time that matches the server's last midnight
// time.
Time daystart = Time::Now() - TimeDelta::FromSeconds(elapsed_seconds);
prefs->SetInt64(kPrefsLastActivePingDay, daystart.ToInternalValue());
prefs->SetInt64(kPrefsLastRollCallPingDay, daystart.ToInternalValue());
return true;
}
// Parses the package node in the given XML document and populates
// |output_object| if valid. Returns true if we should continue the parsing.
// False otherwise, in which case it sets any error code using |completer|.
bool ParsePackage(OmahaParserData::App* app,
OmahaResponse* output_object,
ScopedActionCompleter* completer) {
if (app->updatecheck_status.empty() ||
app->updatecheck_status == kValNoUpdate) {
if (!app->packages.empty()) {
LOG(ERROR) << "No update in this <app> but <package> is not empty.";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
return true;
}
if (app->packages.empty()) {
LOG(ERROR) << "Omaha Response has no packages";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
if (app->url_codebase.empty()) {
LOG(ERROR) << "No Omaha Response URLs";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Found " << app->url_codebase.size() << " url(s)";
vector<string> metadata_sizes =
base::SplitString(app->action_postinstall_attrs[kAttrMetadataSize],
":",
base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL);
vector<string> metadata_signatures = base::SplitString(
app->action_postinstall_attrs[kAttrMetadataSignatureRsa],
":",
base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL);
vector<string> is_delta_payloads =
base::SplitString(app->action_postinstall_attrs[kAttrIsDeltaPayload],
":",
base::TRIM_WHITESPACE,
base::SPLIT_WANT_ALL);
for (size_t i = 0; i < app->packages.size(); i++) {
const auto& package = app->packages[i];
if (package.name.empty()) {
LOG(ERROR) << "Omaha Response has empty package name";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Found package " << package.name;
OmahaResponse::Package out_package;
for (const string& codebase : app->url_codebase) {
if (codebase.empty()) {
LOG(ERROR) << "Omaha Response URL has empty codebase";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
out_package.payload_urls.push_back(codebase + package.name);
}
// Parse the payload size.
base::StringToUint64(package.size, &out_package.size);
if (out_package.size <= 0) {
LOG(ERROR) << "Omaha Response has invalid payload size: " << package.size;
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Payload size = " << out_package.size << " bytes";
if (i < metadata_sizes.size())
base::StringToUint64(metadata_sizes[i], &out_package.metadata_size);
LOG(INFO) << "Payload metadata size = " << out_package.metadata_size
<< " bytes";
if (i < metadata_signatures.size())
out_package.metadata_signature = metadata_signatures[i];
LOG(INFO) << "Payload metadata signature = "
<< out_package.metadata_signature;
out_package.hash = package.hash;
if (out_package.hash.empty()) {
LOG(ERROR) << "Omaha Response has empty hash_sha256 value";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Payload hash = " << out_package.hash;
if (i < is_delta_payloads.size())
out_package.is_delta = ParseBool(is_delta_payloads[i]);
LOG(INFO) << "Payload is delta = " << utils::ToString(out_package.is_delta);
output_object->packages.push_back(std::move(out_package));
}
return true;
}
// Parses the 2 key version strings kernel_version and firmware_version. If the
// field is not present, or cannot be parsed the values default to 0xffff.
void ParseRollbackVersions(int allowed_milestones,
OmahaParserData* parser_data,
OmahaResponse* output_object) {
utils::ParseRollbackKeyVersion(
parser_data->updatecheck_attrs[kAttrFirmwareVersion],
&output_object->rollback_key_version.firmware_key,
&output_object->rollback_key_version.firmware);
utils::ParseRollbackKeyVersion(
parser_data->updatecheck_attrs[kAttrKernelVersion],
&output_object->rollback_key_version.kernel_key,
&output_object->rollback_key_version.kernel);
// Create the attribute name strings for milestone N - allowed_milestones.
const string firmware_max_rollforward_attr =
base::StringPrintf("%s_%i", kAttrFirmwareVersion, allowed_milestones);
const string kernel_max_rollforward_attr =
base::StringPrintf("%s_%i", kAttrKernelVersion, allowed_milestones);
const bool max_firmware_and_kernel_exist =
parser_data->updatecheck_attrs.count(firmware_max_rollforward_attr) > 0 &&
parser_data->updatecheck_attrs.count(kernel_max_rollforward_attr) > 0;
string firmware_version;
string kernel_version;
if (max_firmware_and_kernel_exist) {
firmware_version =
parser_data->updatecheck_attrs[firmware_max_rollforward_attr];
kernel_version =
parser_data->updatecheck_attrs[kernel_max_rollforward_attr];
}
LOG(INFO) << "For milestone N-" << allowed_milestones
<< " firmware_key_version=" << firmware_version
<< " kernel_key_version=" << kernel_version;
OmahaResponse::RollbackKeyVersion version;
utils::ParseRollbackKeyVersion(
firmware_version, &version.firmware_key, &version.firmware);
utils::ParseRollbackKeyVersion(
kernel_version, &version.kernel_key, &version.kernel);
output_object->past_rollback_key_version = std::move(version);
}
} // namespace
bool OmahaRequestAction::ParseResponse(OmahaParserData* parser_data,
OmahaResponse* output_object,
ScopedActionCompleter* completer) {
if (parser_data->apps.empty()) {
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Found " << parser_data->apps.size() << " <app>.";
// chromium-os:37289: The PollInterval is not supported by Omaha server
// currently. But still keeping this existing code in case we ever decide to
// slow down the request rate from the server-side. Note that the PollInterval
// is not persisted, so it has to be sent by the server on every response to
// guarantee that the scheduler uses this value (otherwise, if the device got
// rebooted after the last server-indicated value, it'll revert to the default
// value). Also kDefaultMaxUpdateChecks value for the scattering logic is
// based on the assumption that we perform an update check every hour so that
// the max value of 8 will roughly be equivalent to one work day. If we decide
// to use PollInterval permanently, we should update the
// max_update_checks_allowed to take PollInterval into account. Note: The
// parsing for PollInterval happens even before parsing of the status because
// we may want to specify the PollInterval even when there's no update.
base::StringToInt(parser_data->updatecheck_poll_interval,
&output_object->poll_interval);
// Check for the "elapsed_days" attribute in the "daystart"
// element. This is the number of days since Jan 1 2007, 0:00
// PST. If we don't have a persisted value of the Omaha InstallDate,
// we'll use it to calculate it and then persist it.
if (ParseInstallDate(parser_data, output_object) &&
!HasInstallDate(system_state_)) {
// Since output_object->install_date_days is never negative, the
// elapsed_days -> install-date calculation is reduced to simply
// rounding down to the nearest number divisible by 7.
int remainder = output_object->install_date_days % 7;
int install_date_days_rounded =
output_object->install_date_days - remainder;
if (PersistInstallDate(system_state_,
install_date_days_rounded,
kProvisionedFromOmahaResponse)) {
LOG(INFO) << "Set the Omaha InstallDate from Omaha Response to "
<< install_date_days_rounded << " days";
}
}
// We persist the cohorts sent by omaha even if the status is "noupdate".
for (const auto& app : parser_data->apps) {
if (app.id == params_->GetAppId()) {
if (app.cohort_set)
PersistCohortData(kPrefsOmahaCohort, app.cohort);
if (app.cohorthint_set)
PersistCohortData(kPrefsOmahaCohortHint, app.cohorthint);
if (app.cohortname_set)
PersistCohortData(kPrefsOmahaCohortName, app.cohortname);
break;
}
}
// Parse the updatecheck attributes.
PersistEolStatus(parser_data->updatecheck_attrs);
// Rollback-related updatecheck attributes.
// Defaults to false if attribute is not present.
output_object->is_rollback =
ParseBool(parser_data->updatecheck_attrs[kAttrRollback]);
// Parses the rollback versions of the current image. If the fields do not
// exist they default to 0xffff for the 4 key versions.
ParseRollbackVersions(
params_->rollback_allowed_milestones(), parser_data, output_object);
if (!ParseStatus(parser_data, output_object, completer))
return false;
if (!ParseParams(parser_data, output_object, completer))
return false;
// Package has to be parsed after Params now because ParseParams need to make
// sure that postinstall action exists.
for (auto& app : parser_data->apps)
if (!ParsePackage(&app, output_object, completer))
return false;
return true;
}
bool OmahaRequestAction::ParseStatus(OmahaParserData* parser_data,
OmahaResponse* output_object,
ScopedActionCompleter* completer) {
output_object->update_exists = false;
for (const auto& app : parser_data->apps) {
const string& status = app.updatecheck_status;
if (status == kValNoUpdate) {
// Don't update if any app has status="noupdate".
LOG(INFO) << "No update for <app> " << app.id;
output_object->update_exists = false;
break;
} else if (status == "ok") {
auto const& attr_no_update =
app.action_postinstall_attrs.find(kAttrNoUpdate);
if (attr_no_update != app.action_postinstall_attrs.end() &&
attr_no_update->second == "true") {
// noupdate="true" in postinstall attributes means it's an update to
// self, only update if there's at least one app really have update.
LOG(INFO) << "Update to self for <app> " << app.id;
} else {
LOG(INFO) << "Update for <app> " << app.id;
output_object->update_exists = true;
}
} else if (status.empty() && params_->is_install() &&
params_->GetAppId() == app.id) {
// Skips the platform app for install operation.
LOG(INFO) << "No payload (and ignore) for <app> " << app.id;
} else {
LOG(ERROR) << "Unknown Omaha response status: " << status;
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
}
if (!output_object->update_exists) {
SetOutputObject(*output_object);
completer->set_code(ErrorCode::kSuccess);
}
return output_object->update_exists;
}
bool OmahaRequestAction::ParseParams(OmahaParserData* parser_data,
OmahaResponse* output_object,
ScopedActionCompleter* completer) {
map<string, string> attrs;
for (auto& app : parser_data->apps) {
if (app.id == params_->GetAppId()) {
// this is the app (potentially the only app)
output_object->version = app.manifest_version;
} else if (!params_->system_app_id().empty() &&
app.id == params_->system_app_id()) {
// this is the system app (this check is intentionally skipped if there is
// no system_app_id set)
output_object->system_version = app.manifest_version;
} else if (params_->is_install() &&
app.manifest_version != params_->app_version()) {
LOG(WARNING) << "An app has a different version (" << app.manifest_version
<< ") that is different than platform app version ("
<< params_->app_version() << ")";
}
if (!app.action_postinstall_attrs.empty() && attrs.empty()) {
attrs = app.action_postinstall_attrs;
}
}
if (params_->is_install()) {
LOG(INFO) << "Use request version for Install operation.";
output_object->version = params_->app_version();
}
if (output_object->version.empty()) {
LOG(ERROR) << "Omaha Response does not have version in manifest!";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
LOG(INFO) << "Received omaha response to update to version "
<< output_object->version;
if (attrs.empty()) {
LOG(ERROR) << "Omaha Response has no postinstall event action";
completer->set_code(ErrorCode::kOmahaResponseInvalid);
return false;
}
// Get the optional properties one by one.
output_object->more_info_url = attrs[kAttrMoreInfo];
output_object->prompt = ParseBool(attrs[kAttrPrompt]);
output_object->deadline = attrs[kAttrDeadline];
output_object->max_days_to_scatter = ParseInt(attrs[kAttrMaxDaysToScatter]);
output_object->disable_p2p_for_downloading =
ParseBool(attrs[kAttrDisableP2PForDownloading]);
output_object->disable_p2p_for_sharing =
ParseBool(attrs[kAttrDisableP2PForSharing]);
output_object->public_key_rsa = attrs[kAttrPublicKeyRsa];
string max = attrs[kAttrMaxFailureCountPerUrl];
if (!base::StringToUint(max, &output_object->max_failure_count_per_url))
output_object->max_failure_count_per_url = kDefaultMaxFailureCountPerUrl;
output_object->disable_payload_backoff =
ParseBool(attrs[kAttrDisablePayloadBackoff]);
output_object->powerwash_required = ParseBool(attrs[kAttrPowerwash]);
return true;
}
// If the transfer was successful, this uses expat to parse the response
// and fill in the appropriate fields of the output object. Also, notifies
// the processor that we're done.
void OmahaRequestAction::TransferComplete(HttpFetcher* fetcher,
bool successful) {
ScopedActionCompleter completer(processor_, this);
string current_response(response_buffer_.begin(), response_buffer_.end());
LOG(INFO) << "Omaha request response: " << current_response;
PayloadStateInterface* const payload_state = system_state_->payload_state();
// Set the max kernel key version based on whether rollback is allowed.
SetMaxKernelKeyVersionForRollback();
// Events are best effort transactions -- assume they always succeed.
if (IsEvent()) {
CHECK(!HasOutputPipe()) << "No output pipe allowed for event requests.";
completer.set_code(ErrorCode::kSuccess);
return;
}
if (!successful) {
LOG(ERROR) << "Omaha request network transfer failed.";
int code = GetHTTPResponseCode();
// Makes sure we send sane error values.
if (code < 0 || code >= 1000) {
code = 999;
}
completer.set_code(static_cast<ErrorCode>(
static_cast<int>(ErrorCode::kOmahaRequestHTTPResponseBase) + code));
return;
}
XML_Parser parser = XML_ParserCreate(nullptr);
OmahaParserData parser_data(parser);
XML_SetUserData(parser, &parser_data);
XML_SetElementHandler(parser, ParserHandlerStart, ParserHandlerEnd);
XML_SetEntityDeclHandler(parser, ParserHandlerEntityDecl);
XML_Status res =
XML_Parse(parser,
reinterpret_cast<const char*>(response_buffer_.data()),
response_buffer_.size(),
XML_TRUE);
if (res != XML_STATUS_OK || parser_data.failed) {
LOG(ERROR) << "Omaha response not valid XML: "
<< XML_ErrorString(XML_GetErrorCode(parser)) << " at line "
<< XML_GetCurrentLineNumber(parser) << " col "
<< XML_GetCurrentColumnNumber(parser);
XML_ParserFree(parser);
ErrorCode error_code = ErrorCode::kOmahaRequestXMLParseError;
if (response_buffer_.empty()) {
error_code = ErrorCode::kOmahaRequestEmptyResponseError;
} else if (parser_data.entity_decl) {
error_code = ErrorCode::kOmahaRequestXMLHasEntityDecl;
}
completer.set_code(error_code);
return;
}
XML_ParserFree(parser);
// Update the last ping day preferences based on the server daystart response
// even if we didn't send a ping. Omaha always includes the daystart in the
// response, but log the error if it didn't.
LOG_IF(ERROR, !UpdateLastPingDays(&parser_data, system_state_->prefs()))
<< "Failed to update the last ping day preferences!";
// Sets first_active_omaha_ping_sent to true (vpd in CrOS). We only do this if
// we have got a response from omaha and if its value has never been set to
// true before. Failure of this function should be ignored. There should be no
// need to check if a=-1 has been sent because older devices have already sent
// their a=-1 in the past and we have to set first_active_omaha_ping_sent for
// future checks.
if (!system_state_->hardware()->GetFirstActiveOmahaPingSent()) {
if (!system_state_->hardware()->SetFirstActiveOmahaPingSent()) {
system_state_->metrics_reporter()->ReportInternalErrorCode(
ErrorCode::kFirstActiveOmahaPingSentPersistenceError);
}
}
if (!HasOutputPipe()) {
// Just set success to whether or not the http transfer succeeded,
// which must be true at this point in the code.
completer.set_code(ErrorCode::kSuccess);
return;
}
OmahaResponse output_object;
if (!ParseResponse(&parser_data, &output_object, &completer))
return;
output_object.update_exists = true;
SetOutputObject(output_object);
LoadOrPersistUpdateFirstSeenAtPref();
ErrorCode error = ErrorCode::kSuccess;
if (ShouldIgnoreUpdate(output_object, &error)) {
// No need to change output_object.update_exists here, since the value
// has been output to the pipe.
completer.set_code(error);
return;
}
// If Omaha says to disable p2p, respect that
if (output_object.disable_p2p_for_downloading) {
LOG(INFO) << "Forcibly disabling use of p2p for downloading as "
<< "requested by Omaha.";
payload_state->SetUsingP2PForDownloading(false);
}
if (output_object.disable_p2p_for_sharing) {
LOG(INFO) << "Forcibly disabling use of p2p for sharing as "
<< "requested by Omaha.";
payload_state->SetUsingP2PForSharing(false);
}
// Update the payload state with the current response. The payload state
// will automatically reset all stale state if this response is different
// from what's stored already. We are updating the payload state as late
// as possible in this method so that if a new release gets pushed and then
// got pulled back due to some issues, we don't want to clear our internal
// state unnecessarily.
payload_state->SetResponse(output_object);
// It could be we've already exceeded the deadline for when p2p is
// allowed or that we've tried too many times with p2p. Check that.
if (payload_state->GetUsingP2PForDownloading()) {
payload_state->P2PNewAttempt();
if (!payload_state->P2PAttemptAllowed()) {
LOG(INFO) << "Forcibly disabling use of p2p for downloading because "
<< "of previous failures when using p2p.";
payload_state->SetUsingP2PForDownloading(false);
}
}
// From here on, we'll complete stuff in CompleteProcessing() so
// disable |completer| since we'll create a new one in that
// function.
completer.set_should_complete(false);
// If we're allowed to use p2p for downloading we do not pay
// attention to wall-clock-based waiting if the URL is indeed
// available via p2p. Therefore, check if the file is available via
// p2p before deferring...
if (payload_state->GetUsingP2PForDownloading()) {
LookupPayloadViaP2P(output_object);
} else {
CompleteProcessing();
}
}
void OmahaRequestAction::CompleteProcessing() {
ScopedActionCompleter completer(processor_, this);
OmahaResponse& output_object = const_cast<OmahaResponse&>(GetOutputObject());
PayloadStateInterface* payload_state = system_state_->payload_state();
if (ShouldDeferDownload(&output_object)) {
output_object.update_exists = false;
LOG(INFO) << "Ignoring Omaha updates as updates are deferred by policy.";
completer.set_code(ErrorCode::kOmahaUpdateDeferredPerPolicy);
return;
}
if (payload_state->ShouldBackoffDownload()) {
output_object.update_exists = false;
LOG(INFO) << "Ignoring Omaha updates in order to backoff our retry "
<< "attempts";
completer.set_code(ErrorCode::kOmahaUpdateDeferredForBackoff);
return;
}
completer.set_code(ErrorCode::kSuccess);
}
void OmahaRequestAction::OnLookupPayloadViaP2PCompleted(const string& url) {
LOG(INFO) << "Lookup complete, p2p-client returned URL '" << url << "'";
if (!url.empty()) {
system_state_->payload_state()->SetP2PUrl(url);
} else {
LOG(INFO) << "Forcibly disabling use of p2p for downloading "
<< "because no suitable peer could be found.";
system_state_->payload_state()->SetUsingP2PForDownloading(false);
}
CompleteProcessing();
}
void OmahaRequestAction::LookupPayloadViaP2P(const OmahaResponse& response) {
// If the device is in the middle of an update, the state variables
// kPrefsUpdateStateNextDataOffset, kPrefsUpdateStateNextDataLength
// tracks the offset and length of the operation currently in
// progress. The offset is based from the end of the manifest which
// is kPrefsManifestMetadataSize bytes long.
//
// To make forward progress and avoid deadlocks, we need to find a
// peer that has at least the entire operation we're currently
// working on. Otherwise we may end up in a situation where two
// devices bounce back and forth downloading from each other,
// neither making any forward progress until one of them decides to
// stop using p2p (via kMaxP2PAttempts and kMaxP2PAttemptTimeSeconds
// safe-guards). See http://crbug.com/297170 for an example)
size_t minimum_size = 0;
int64_t manifest_metadata_size = 0;
int64_t manifest_signature_size = 0;
int64_t next_data_offset = 0;
int64_t next_data_length = 0;
if (system_state_ &&
system_state_->prefs()->GetInt64(kPrefsManifestMetadataSize,
&manifest_metadata_size) &&
manifest_metadata_size != -1 &&
system_state_->prefs()->GetInt64(kPrefsManifestSignatureSize,
&manifest_signature_size) &&
manifest_signature_size != -1 &&
system_state_->prefs()->GetInt64(kPrefsUpdateStateNextDataOffset,
&next_data_offset) &&
next_data_offset != -1 &&
system_state_->prefs()->GetInt64(kPrefsUpdateStateNextDataLength,
&next_data_length)) {
minimum_size = manifest_metadata_size + manifest_signature_size +
next_data_offset + next_data_length;
}
// TODO(senj): Fix P2P for multiple package.
brillo::Blob raw_hash;
if (!base::HexStringToBytes(response.packages[0].hash, &raw_hash))
return;
string file_id =
utils::CalculateP2PFileId(raw_hash, response.packages[0].size);
if (system_state_->p2p_manager()) {
LOG(INFO) << "Checking if payload is available via p2p, file_id=" << file_id
<< " minimum_size=" << minimum_size;
system_state_->p2p_manager()->LookupUrlForFile(
file_id,
minimum_size,
TimeDelta::FromSeconds(kMaxP2PNetworkWaitTimeSeconds),
base::Bind(&OmahaRequestAction::OnLookupPayloadViaP2PCompleted,
base::Unretained(this)));
}
}
bool OmahaRequestAction::ShouldDeferDownload(OmahaResponse* output_object) {
if (params_->interactive()) {
LOG(INFO) << "Not deferring download because update is interactive.";
return false;
}
// If we're using p2p to download _and_ we have a p2p URL, we never
// defer the download. This is because the download will always
// happen from a peer on the LAN and we've been waiting in line for
// our turn.
const PayloadStateInterface* payload_state = system_state_->payload_state();
if (payload_state->GetUsingP2PForDownloading() &&
!payload_state->GetP2PUrl().empty()) {
LOG(INFO) << "Download not deferred because download "
<< "will happen from a local peer (via p2p).";
return false;
}
// We should defer the downloads only if we've first satisfied the
// wall-clock-based-waiting period and then the update-check-based waiting
// period, if required.
if (!params_->wall_clock_based_wait_enabled()) {
LOG(INFO) << "Wall-clock-based waiting period is not enabled,"
<< " so no deferring needed.";
return false;
}
switch (IsWallClockBasedWaitingSatisfied(output_object)) {
case kWallClockWaitNotSatisfied:
// We haven't even satisfied the first condition, passing the
// wall-clock-based waiting period, so we should defer the downloads
// until that happens.
LOG(INFO) << "wall-clock-based-wait not satisfied.";
return true;
case kWallClockWaitDoneButUpdateCheckWaitRequired:
LOG(INFO) << "wall-clock-based-wait satisfied and "
<< "update-check-based-wait required.";
return !IsUpdateCheckCountBasedWaitingSatisfied();
case kWallClockWaitDoneAndUpdateCheckWaitNotRequired:
// Wall-clock-based waiting period is satisfied, and it's determined
// that we do not need the update-check-based wait. so no need to
// defer downloads.
LOG(INFO) << "wall-clock-based-wait satisfied and "
<< "update-check-based-wait is not required.";
return false;
default:
// Returning false for this default case so we err on the
// side of downloading updates than deferring in case of any bugs.
NOTREACHED();
return false;
}
}
OmahaRequestAction::WallClockWaitResult
OmahaRequestAction::IsWallClockBasedWaitingSatisfied(
OmahaResponse* output_object) {
Time update_first_seen_at = LoadOrPersistUpdateFirstSeenAtPref();
if (update_first_seen_at == base::Time()) {
LOG(INFO) << "Not scattering as UpdateFirstSeenAt value cannot be read or "
"persisted";
return kWallClockWaitDoneAndUpdateCheckWaitNotRequired;
}
TimeDelta elapsed_time =
system_state_->clock()->GetWallclockTime() - update_first_seen_at;
TimeDelta max_scatter_period =
TimeDelta::FromDays(output_object->max_days_to_scatter);
int64_t staging_wait_time_in_days = 0;
// Use staging and its default max value if staging is on.
if (system_state_->prefs()->GetInt64(kPrefsWallClockStagingWaitPeriod,
&staging_wait_time_in_days) &&
staging_wait_time_in_days > 0)
max_scatter_period = TimeDelta::FromDays(kMaxWaitTimeStagingInDays);
LOG(INFO) << "Waiting Period = "
<< utils::FormatSecs(params_->waiting_period().InSeconds())
<< ", Time Elapsed = "
<< utils::FormatSecs(elapsed_time.InSeconds())
<< ", MaxDaysToScatter = " << max_scatter_period.InDays();
if (!output_object->deadline.empty()) {
// The deadline is set for all rules which serve a delta update from a
// previous FSI, which means this update will be applied mostly in OOBE
// cases. For these cases, we shouldn't scatter so as to finish the OOBE
// quickly.
LOG(INFO) << "Not scattering as deadline flag is set";
return kWallClockWaitDoneAndUpdateCheckWaitNotRequired;
}
if (max_scatter_period.InDays() == 0) {
// This means the Omaha rule creator decides that this rule
// should not be scattered irrespective of the policy.
LOG(INFO) << "Not scattering as MaxDaysToScatter in rule is 0.";
return kWallClockWaitDoneAndUpdateCheckWaitNotRequired;
}
if (elapsed_time > max_scatter_period) {
// This means we've waited more than the upperbound wait in the rule
// from the time we first saw a valid update available to us.
// This will prevent update starvation.
LOG(INFO) << "Not scattering as we're past the MaxDaysToScatter limit.";
return kWallClockWaitDoneAndUpdateCheckWaitNotRequired;
}
// This means we are required to participate in scattering.
// See if our turn has arrived now.
TimeDelta remaining_wait_time = params_->waiting_period() - elapsed_time;
if (remaining_wait_time.InSeconds() <= 0) {
// Yes, it's our turn now.
LOG(INFO) << "Successfully passed the wall-clock-based-wait.";
// But we can't download until the update-check-count-based wait is also
// satisfied, so mark it as required now if update checks are enabled.
return params_->update_check_count_wait_enabled()
? kWallClockWaitDoneButUpdateCheckWaitRequired
: kWallClockWaitDoneAndUpdateCheckWaitNotRequired;
}
// Not our turn yet, so we have to wait until our turn to
// help scatter the downloads across all clients of the enterprise.
LOG(INFO) << "Update deferred for another "
<< utils::FormatSecs(remaining_wait_time.InSeconds())
<< " per policy.";
return kWallClockWaitNotSatisfied;
}
bool OmahaRequestAction::IsUpdateCheckCountBasedWaitingSatisfied() {
int64_t update_check_count_value;
if (system_state_->prefs()->Exists(kPrefsUpdateCheckCount)) {
if (!system_state_->prefs()->GetInt64(kPrefsUpdateCheckCount,
&update_check_count_value)) {
// We are unable to read the update check count from file for some reason.
// So let's proceed anyway so as to not stall the update.
LOG(ERROR) << "Unable to read update check count. "
<< "Skipping update-check-count-based-wait.";
return true;
}
} else {
// This file does not exist. This means we haven't started our update
// check count down yet, so this is the right time to start the count down.
update_check_count_value =
base::RandInt(params_->min_update_checks_needed(),
params_->max_update_checks_allowed());
LOG(INFO) << "Randomly picked update check count value = "
<< update_check_count_value;
// Write out the initial value of update_check_count_value.
if (!system_state_->prefs()->SetInt64(kPrefsUpdateCheckCount,
update_check_count_value)) {
// We weren't able to write the update check count file for some reason.
// So let's proceed anyway so as to not stall the update.
LOG(ERROR) << "Unable to write update check count. "
<< "Skipping update-check-count-based-wait.";
return true;
}
}
if (update_check_count_value == 0) {
LOG(INFO) << "Successfully passed the update-check-based-wait.";
return true;
}
if (update_check_count_value < 0 ||
update_check_count_value > params_->max_update_checks_allowed()) {
// We err on the side of skipping scattering logic instead of stalling
// a machine from receiving any updates in case of any unexpected state.
LOG(ERROR) << "Invalid value for update check count detected. "
<< "Skipping update-check-count-based-wait.";
return true;
}
// Legal value, we need to wait for more update checks to happen
// until this becomes 0.
LOG(INFO) << "Deferring Omaha updates for another "
<< update_check_count_value << " update checks per policy";
return false;
}
// static
bool OmahaRequestAction::ParseInstallDate(OmahaParserData* parser_data,
OmahaResponse* output_object) {
int64_t elapsed_days = 0;
if (!base::StringToInt64(parser_data->daystart_elapsed_days, &elapsed_days))
return false;
if (elapsed_days < 0)
return false;
output_object->install_date_days = elapsed_days;
return true;
}
// static
bool OmahaRequestAction::HasInstallDate(SystemState* system_state) {
PrefsInterface* prefs = system_state->prefs();
if (prefs == nullptr)
return false;
return prefs->Exists(kPrefsInstallDateDays);
}
// static
bool OmahaRequestAction::PersistInstallDate(
SystemState* system_state,
int install_date_days,
InstallDateProvisioningSource source) {
TEST_AND_RETURN_FALSE(install_date_days >= 0);
PrefsInterface* prefs = system_state->prefs();
if (prefs == nullptr)
return false;
if (!prefs->SetInt64(kPrefsInstallDateDays, install_date_days))
return false;
system_state->metrics_reporter()->ReportInstallDateProvisioningSource(
static_cast<int>(source), // Sample.
kProvisionedMax); // Maximum.
return true;
}
bool OmahaRequestAction::PersistCohortData(const string& prefs_key,
const string& new_value) {
if (new_value.empty() && system_state_->prefs()->Exists(prefs_key)) {
LOG(INFO) << "Removing stored " << prefs_key << " value.";
return system_state_->prefs()->Delete(prefs_key);
} else if (!new_value.empty()) {
LOG(INFO) << "Storing new setting " << prefs_key << " as " << new_value;
return system_state_->prefs()->SetString(prefs_key, new_value);
}
return true;
}
bool OmahaRequestAction::PersistEolStatus(const map<string, string>& attrs) {
auto eol_attr = attrs.find(kAttrEol);
if (eol_attr != attrs.end()) {
return system_state_->prefs()->SetString(kPrefsOmahaEolStatus,
eol_attr->second);
} else if (system_state_->prefs()->Exists(kPrefsOmahaEolStatus)) {
return system_state_->prefs()->Delete(kPrefsOmahaEolStatus);
}
return true;
}
void OmahaRequestAction::ActionCompleted(ErrorCode code) {
// We only want to report this on "update check".
if (ping_only_ || event_ != nullptr)
return;
metrics::CheckResult result = metrics::CheckResult::kUnset;
metrics::CheckReaction reaction = metrics::CheckReaction::kUnset;
metrics::DownloadErrorCode download_error_code =
metrics::DownloadErrorCode::kUnset;
// Regular update attempt.
switch (code) {
case ErrorCode::kSuccess:
// OK, we parsed the response successfully but that does
// necessarily mean that an update is available.
if (HasOutputPipe()) {
const OmahaResponse& response = GetOutputObject();
if (response.update_exists) {
result = metrics::CheckResult::kUpdateAvailable;
reaction = metrics::CheckReaction::kUpdating;
} else {
result = metrics::CheckResult::kNoUpdateAvailable;
}
} else {
result = metrics::CheckResult::kNoUpdateAvailable;
}
break;
case ErrorCode::kOmahaUpdateIgnoredPerPolicy:
case ErrorCode::kOmahaUpdateIgnoredOverCellular:
result = metrics::CheckResult::kUpdateAvailable;
reaction = metrics::CheckReaction::kIgnored;
break;
case ErrorCode::kOmahaUpdateDeferredPerPolicy:
result = metrics::CheckResult::kUpdateAvailable;
reaction = metrics::CheckReaction::kDeferring;
break;
case ErrorCode::kOmahaUpdateDeferredForBackoff:
result = metrics::CheckResult::kUpdateAvailable;
reaction = metrics::CheckReaction::kBackingOff;
break;
default:
// We report two flavors of errors, "Download errors" and "Parsing
// error". Try to convert to the former and if that doesn't work
// we know it's the latter.
metrics::DownloadErrorCode tmp_error =
metrics_utils::GetDownloadErrorCode(code);
if (tmp_error != metrics::DownloadErrorCode::kInputMalformed) {
result = metrics::CheckResult::kDownloadError;
download_error_code = tmp_error;
} else {
result = metrics::CheckResult::kParsingError;
}
break;
}
system_state_->metrics_reporter()->ReportUpdateCheckMetrics(
system_state_, result, reaction, download_error_code);
}
bool OmahaRequestAction::ShouldIgnoreUpdate(const OmahaResponse& response,
ErrorCode* error) const {
// Note: policy decision to not update to a version we rolled back from.
string rollback_version =
system_state_->payload_state()->GetRollbackVersion();
if (!rollback_version.empty()) {
LOG(INFO) << "Detected previous rollback from version " << rollback_version;
if (rollback_version == response.version) {
LOG(INFO) << "Received version that we rolled back from. Ignoring.";
*error = ErrorCode::kOmahaUpdateIgnoredPerPolicy;
return true;
}
}
if (system_state_->hardware()->IsOOBEEnabled() &&
!system_state_->hardware()->IsOOBEComplete(nullptr) &&
(response.deadline.empty() ||
system_state_->payload_state()->GetRollbackHappened()) &&
params_->app_version() != "ForcedUpdate") {
LOG(INFO) << "Ignoring a non-critical Omaha update before OOBE completion.";
*error = ErrorCode::kNonCriticalUpdateInOOBE;
return true;
}
if (!IsUpdateAllowedOverCurrentConnection(error, response)) {
LOG(INFO) << "Update is not allowed over current connection.";
return true;
}
// Note: We could technically delete the UpdateFirstSeenAt state when we
// return true. If we do, it'll mean a device has to restart the
// UpdateFirstSeenAt and thus help scattering take effect when the AU is
// turned on again. On the other hand, it also increases the chance of update
// starvation if an admin turns AU on/off more frequently. We choose to err on
// the side of preventing starvation at the cost of not applying scattering in
// those cases.
return false;
}
bool OmahaRequestAction::IsUpdateAllowedOverCellularByPrefs(
const OmahaResponse& response) const {
PrefsInterface* prefs = system_state_->prefs();
if (!prefs) {
LOG(INFO) << "Disabling updates over cellular as the preferences are "
"not available.";
return false;
}
bool is_allowed;
if (prefs->Exists(kPrefsUpdateOverCellularPermission) &&
prefs->GetBoolean(kPrefsUpdateOverCellularPermission, &is_allowed) &&
is_allowed) {
LOG(INFO) << "Allowing updates over cellular as permission preference is "
"set to true.";
return true;
}
if (!prefs->Exists(kPrefsUpdateOverCellularTargetVersion) ||
!prefs->Exists(kPrefsUpdateOverCellularTargetSize)) {
LOG(INFO) << "Disabling updates over cellular as permission preference is "
"set to false or does not exist while target does not exist.";
return false;
}
std::string target_version;
int64_t target_size;
if (!prefs->GetString(kPrefsUpdateOverCellularTargetVersion,
&target_version) ||
!prefs->GetInt64(kPrefsUpdateOverCellularTargetSize, &target_size)) {
LOG(INFO) << "Disabling updates over cellular as the target version or "
"size is not accessible.";
return false;
}
uint64_t total_packages_size = 0;
for (const auto& package : response.packages) {
total_packages_size += package.size;
}
if (target_version == response.version &&
static_cast<uint64_t>(target_size) == total_packages_size) {
LOG(INFO) << "Allowing updates over cellular as the target matches the"
"omaha response.";
return true;
} else {
LOG(INFO) << "Disabling updates over cellular as the target does not"
"match the omaha response.";
return false;
}
}
bool OmahaRequestAction::IsUpdateAllowedOverCurrentConnection(
ErrorCode* error, const OmahaResponse& response) const {
ConnectionType type;
ConnectionTethering tethering;
ConnectionManagerInterface* connection_manager =
system_state_->connection_manager();
if (!connection_manager->GetConnectionProperties(&type, &tethering)) {
LOG(INFO) << "We could not determine our connection type. "
<< "Defaulting to allow updates.";
return true;
}
bool is_allowed = connection_manager->IsUpdateAllowedOver(type, tethering);
bool is_device_policy_set =
connection_manager->IsAllowedConnectionTypesForUpdateSet();
// Treats tethered connection as if it is cellular connection.
bool is_over_cellular = type == ConnectionType::kCellular ||
tethering == ConnectionTethering::kConfirmed;
if (!is_over_cellular) {
// There's no need to further check user preferences as we are not over
// cellular connection.
if (!is_allowed)
*error = ErrorCode::kOmahaUpdateIgnoredPerPolicy;
} else if (is_device_policy_set) {
// There's no need to further check user preferences as the device policy
// is set regarding updates over cellular.
if (!is_allowed)
*error = ErrorCode::kOmahaUpdateIgnoredPerPolicy;
} else {
// Deivce policy is not set, so user preferences overwrite whether to
// allow updates over cellular.
is_allowed = IsUpdateAllowedOverCellularByPrefs(response);
if (!is_allowed)
*error = ErrorCode::kOmahaUpdateIgnoredOverCellular;
}
LOG(INFO) << "We are connected via "
<< connection_utils::StringForConnectionType(type)
<< ", Updates allowed: " << (is_allowed ? "Yes" : "No");
return is_allowed;
}
bool OmahaRequestAction::IsRollbackEnabled() const {
if (policy_provider_->IsConsumerDevice()) {
LOG(INFO) << "Rollback is not enabled for consumer devices.";
return false;
}
if (!policy_provider_->device_policy_is_loaded()) {
LOG(INFO) << "No device policy is loaded. Assuming rollback enabled.";
return true;
}
int allowed_milestones;
if (!policy_provider_->GetDevicePolicy().GetRollbackAllowedMilestones(
&allowed_milestones)) {
LOG(INFO) << "RollbackAllowedMilestones policy can't be read. "
"Defaulting to rollback enabled.";
return true;
}
LOG(INFO) << "Rollback allows " << allowed_milestones << " milestones.";
return allowed_milestones > 0;
}
void OmahaRequestAction::SetMaxKernelKeyVersionForRollback() const {
int max_kernel_rollforward;
int min_kernel_version = system_state_->hardware()->GetMinKernelKeyVersion();
if (IsRollbackEnabled()) {
// If rollback is enabled, set the max kernel key version to the current
// kernel key version. This has the effect of freezing kernel key roll
// forwards.
//
// TODO(zentaro): This behavior is temporary, and ensures that no kernel
// key roll forward happens until the server side components of rollback
// are implemented. Future changes will allow the Omaha server to return
// the kernel key version from max_rollback_versions in the past. At that
// point the max kernel key version will be set to that value, creating a
// sliding window of versions that can be rolled back to.
LOG(INFO) << "Rollback is enabled. Setting kernel_max_rollforward to "
<< min_kernel_version;
max_kernel_rollforward = min_kernel_version;
} else {
// For devices that are not rollback enabled (ie. consumer devices), the
// max kernel key version is set to 0xfffffffe, which is logically
// infinity. This maintains the previous behavior that that kernel key
// versions roll forward each time they are incremented.
LOG(INFO) << "Rollback is disabled. Setting kernel_max_rollforward to "
<< kRollforwardInfinity;
max_kernel_rollforward = kRollforwardInfinity;
}
bool max_rollforward_set =
system_state_->hardware()->SetMaxKernelKeyRollforward(
max_kernel_rollforward);
if (!max_rollforward_set) {
LOG(ERROR) << "Failed to set kernel_max_rollforward";
}
// Report metrics
system_state_->metrics_reporter()->ReportKeyVersionMetrics(
min_kernel_version, max_kernel_rollforward, max_rollforward_set);
}
base::Time OmahaRequestAction::LoadOrPersistUpdateFirstSeenAtPref() const {
Time update_first_seen_at;
int64_t update_first_seen_at_int;
if (system_state_->prefs()->Exists(kPrefsUpdateFirstSeenAt)) {
if (system_state_->prefs()->GetInt64(kPrefsUpdateFirstSeenAt,
&update_first_seen_at_int)) {
// Note: This timestamp could be that of ANY update we saw in the past
// (not necessarily this particular update we're considering to apply)
// but never got to apply because of some reason (e.g. stop AU policy,
// updates being pulled out from Omaha, changes in target version prefix,
// new update being rolled out, etc.). But for the purposes of scattering
// it doesn't matter which update the timestamp corresponds to. i.e.
// the clock starts ticking the first time we see an update and we're
// ready to apply when the random wait period is satisfied relative to
// that first seen timestamp.
update_first_seen_at = Time::FromInternalValue(update_first_seen_at_int);
LOG(INFO) << "Using persisted value of UpdateFirstSeenAt: "
<< utils::ToString(update_first_seen_at);
} else {
// This seems like an unexpected error where the persisted value exists
// but it's not readable for some reason.
LOG(INFO) << "UpdateFirstSeenAt value cannot be read";
return base::Time();
}
} else {
update_first_seen_at = system_state_->clock()->GetWallclockTime();
update_first_seen_at_int = update_first_seen_at.ToInternalValue();
if (system_state_->prefs()->SetInt64(kPrefsUpdateFirstSeenAt,
update_first_seen_at_int)) {
LOG(INFO) << "Persisted the new value for UpdateFirstSeenAt: "
<< utils::ToString(update_first_seen_at);
} else {
// This seems like an unexpected error where the value cannot be
// persisted for some reason.
LOG(INFO) << "UpdateFirstSeenAt value "
<< utils::ToString(update_first_seen_at)
<< " cannot be persisted";
return base::Time();
}
}
return update_first_seen_at;
}
} // namespace chromeos_update_engine