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/*
* Copyright 2020 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/boringssl_identity.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/pool.h>
#include <stdint.h>
#include <string.h>
#include <ctime>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "absl/strings/string_view.h"
#include "rtc_base/boringssl_certificate.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"
#include "rtc_base/openssl_key_pair.h"
#include "rtc_base/openssl_utility.h"
#include "rtc_base/ssl_certificate.h"
#include "rtc_base/ssl_identity.h"
namespace webrtc {
BoringSSLIdentity::BoringSSLIdentity(
std::unique_ptr<OpenSSLKeyPair> key_pair,
std::unique_ptr<BoringSSLCertificate> certificate)
: key_pair_(std::move(key_pair)) {
RTC_DCHECK(key_pair_ != nullptr);
RTC_DCHECK(certificate != nullptr);
std::vector<std::unique_ptr<SSLCertificate>> certs;
certs.push_back(std::move(certificate));
cert_chain_.reset(new SSLCertChain(std::move(certs)));
}
BoringSSLIdentity::BoringSSLIdentity(std::unique_ptr<OpenSSLKeyPair> key_pair,
std::unique_ptr<SSLCertChain> cert_chain)
: key_pair_(std::move(key_pair)), cert_chain_(std::move(cert_chain)) {
RTC_DCHECK(key_pair_ != nullptr);
RTC_DCHECK(cert_chain_ != nullptr);
}
BoringSSLIdentity::~BoringSSLIdentity() = default;
std::unique_ptr<BoringSSLIdentity> BoringSSLIdentity::CreateInternal(
const SSLIdentityParams& params) {
auto key_pair = OpenSSLKeyPair::Generate(params.key_params);
if (key_pair) {
std::unique_ptr<BoringSSLCertificate> certificate(
BoringSSLCertificate::Generate(key_pair.get(), params));
if (certificate != nullptr) {
return absl::WrapUnique(
new BoringSSLIdentity(std::move(key_pair), std::move(certificate)));
}
}
RTC_LOG(LS_ERROR) << "Identity generation failed.";
return nullptr;
}
// static
std::unique_ptr<BoringSSLIdentity> BoringSSLIdentity::CreateWithExpiration(
absl::string_view common_name,
const KeyParams& key_params,
time_t certificate_lifetime) {
SSLIdentityParams params;
params.key_params = key_params;
params.common_name = std::string(common_name);
time_t now = time(nullptr);
params.not_before = now + kCertificateWindowInSeconds;
params.not_after = now + certificate_lifetime;
if (params.not_before > params.not_after)
return nullptr;
return CreateInternal(params);
}
std::unique_ptr<BoringSSLIdentity> BoringSSLIdentity::CreateForTest(
const SSLIdentityParams& params) {
return CreateInternal(params);
}
std::unique_ptr<SSLIdentity> BoringSSLIdentity::CreateFromPEMStrings(
absl::string_view private_key,
absl::string_view certificate) {
std::unique_ptr<BoringSSLCertificate> cert(
BoringSSLCertificate::FromPEMString(certificate));
if (!cert) {
RTC_LOG(LS_ERROR)
<< "Failed to create BoringSSLCertificate from PEM string.";
return nullptr;
}
auto key_pair = OpenSSLKeyPair::FromPrivateKeyPEMString(private_key);
if (!key_pair) {
RTC_LOG(LS_ERROR) << "Failed to create key pair from PEM string.";
return nullptr;
}
return absl::WrapUnique(
new BoringSSLIdentity(std::move(key_pair), std::move(cert)));
}
std::unique_ptr<SSLIdentity> BoringSSLIdentity::CreateFromPEMChainStrings(
absl::string_view private_key,
absl::string_view certificate_chain) {
bssl::UniquePtr<BIO> bio(BIO_new_mem_buf(
certificate_chain.data(), dchecked_cast<int>(certificate_chain.size())));
if (!bio) {
return nullptr;
}
BIO_set_mem_eof_return(bio.get(), 0);
std::vector<std::unique_ptr<SSLCertificate>> certs;
while (true) {
char* name;
char* header;
unsigned char* data;
long len; // NOLINT
int ret = PEM_read_bio(bio.get(), &name, &header, &data, &len);
if (ret == 0) {
uint32_t err = ERR_peek_error();
if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {
err = ERR_get_error();
break;
}
RTC_LOG(LS_ERROR) << "Failed to parse certificate from PEM string.";
return nullptr;
}
bssl::UniquePtr<char> owned_name(name);
bssl::UniquePtr<char> owned_header(header);
bssl::UniquePtr<unsigned char> owned_data(data);
if (strcmp(owned_name.get(), PEM_STRING_X509) != 0) {
RTC_LOG(LS_ERROR)
<< "Non-certificate found while parsing certificate chain: "
<< owned_name.get();
return nullptr;
}
bssl::UniquePtr<CRYPTO_BUFFER> crypto_buffer(
CRYPTO_BUFFER_new(data, len, openssl::GetBufferPool()));
if (!crypto_buffer) {
return nullptr;
}
certs.emplace_back(new BoringSSLCertificate(std::move(crypto_buffer)));
}
if (certs.empty()) {
RTC_LOG(LS_ERROR) << "Found no certificates in PEM string.";
return nullptr;
}
auto key_pair = OpenSSLKeyPair::FromPrivateKeyPEMString(private_key);
if (!key_pair) {
RTC_LOG(LS_ERROR) << "Failed to create key pair from PEM string.";
return nullptr;
}
return absl::WrapUnique(new BoringSSLIdentity(
std::move(key_pair), std::make_unique<SSLCertChain>(std::move(certs))));
}
const BoringSSLCertificate& BoringSSLIdentity::certificate() const {
return *static_cast<const BoringSSLCertificate*>(&cert_chain_->Get(0));
}
const SSLCertChain& BoringSSLIdentity::cert_chain() const {
return *cert_chain_.get();
}
std::unique_ptr<SSLIdentity> BoringSSLIdentity::CloneInternal() const {
// We cannot use std::make_unique here because the referenced
// BoringSSLIdentity constructor is private.
return absl::WrapUnique(
new BoringSSLIdentity(key_pair_->Clone(), cert_chain_->Clone()));
}
bool BoringSSLIdentity::ConfigureIdentity(SSL_CTX* ctx) {
std::vector<CRYPTO_BUFFER*> cert_buffers;
for (size_t i = 0; i < cert_chain_->GetSize(); ++i) {
cert_buffers.push_back(
static_cast<const BoringSSLCertificate*>(&cert_chain_->Get(i))
->cert_buffer());
}
// 1 is the documented success return code.
if (1 != SSL_CTX_set_chain_and_key(ctx, &cert_buffers[0], cert_buffers.size(),
key_pair_->pkey(), nullptr)) {
openssl::LogSSLErrors("Configuring key and certificate");
return false;
}
return true;
}
std::string BoringSSLIdentity::PrivateKeyToPEMString() const {
return key_pair_->PrivateKeyToPEMString();
}
std::string BoringSSLIdentity::PublicKeyToPEMString() const {
return key_pair_->PublicKeyToPEMString();
}
bool BoringSSLIdentity::operator==(const BoringSSLIdentity& other) const {
return *this->key_pair_ == *other.key_pair_ &&
this->certificate() == other.certificate();
}
bool BoringSSLIdentity::operator!=(const BoringSSLIdentity& other) const {
return !(*this == other);
}
} // namespace webrtc
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