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/*
* Copyright 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/rtc_certificate_generator.h"
#include <time.h>
#include <algorithm>
#include <memory>
#include <utility>
#include "rtc_base/checks.h"
#include "rtc_base/ssl_identity.h"
namespace rtc {
namespace {
// A certificates' subject and issuer name.
const char kIdentityName[] = "WebRTC";
const uint64_t kYearInSeconds = 365 * 24 * 60 * 60;
} // namespace
// static
scoped_refptr<RTCCertificate> RTCCertificateGenerator::GenerateCertificate(
const KeyParams& key_params,
const absl::optional<uint64_t>& expires_ms) {
if (!key_params.IsValid()) {
return nullptr;
}
std::unique_ptr<SSLIdentity> identity;
if (!expires_ms) {
identity = SSLIdentity::Create(kIdentityName, key_params);
} else {
uint64_t expires_s = *expires_ms / 1000;
// Limit the expiration time to something reasonable (a year). This was
// somewhat arbitrarily chosen. It also ensures that the value is not too
// large for the unspecified `time_t`.
expires_s = std::min(expires_s, kYearInSeconds);
// TODO(torbjorng): Stop using `time_t`, its type is unspecified. It it safe
// to assume it can hold up to a year's worth of seconds (and more), but
// `SSLIdentity::Create` should stop relying on `time_t`.
// See bugs.webrtc.org/5720.
time_t cert_lifetime_s = static_cast<time_t>(expires_s);
identity = SSLIdentity::Create(kIdentityName, key_params, cert_lifetime_s);
}
if (!identity) {
return nullptr;
}
return RTCCertificate::Create(std::move(identity));
}
RTCCertificateGenerator::RTCCertificateGenerator(Thread* signaling_thread,
Thread* worker_thread)
: signaling_thread_(signaling_thread), worker_thread_(worker_thread) {
RTC_DCHECK(signaling_thread_);
RTC_DCHECK(worker_thread_);
}
void RTCCertificateGenerator::GenerateCertificateAsync(
const KeyParams& key_params,
const absl::optional<uint64_t>& expires_ms,
RTCCertificateGenerator::Callback callback) {
RTC_DCHECK(signaling_thread_->IsCurrent());
RTC_DCHECK(callback);
worker_thread_->PostTask([key_params, expires_ms,
signaling_thread = signaling_thread_,
cb = std::move(callback)]() mutable {
scoped_refptr<RTCCertificate> certificate =
RTCCertificateGenerator::GenerateCertificate(key_params, expires_ms);
signaling_thread->PostTask(
[cert = std::move(certificate), cb = std::move(cb)]() mutable {
std::move(cb)(std::move(cert));
});
});
}
} // namespace rtc
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