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-rw-r--r--third_party/libwebrtc/rtc_base/openssl_certificate.cc290
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diff --git a/third_party/libwebrtc/rtc_base/openssl_certificate.cc b/third_party/libwebrtc/rtc_base/openssl_certificate.cc
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+++ b/third_party/libwebrtc/rtc_base/openssl_certificate.cc
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+/*
+ * Copyright 2004 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/openssl_certificate.h"
+
+#if defined(WEBRTC_WIN)
+// Must be included first before openssl headers.
+#include "rtc_base/win32.h" // NOLINT
+#endif // WEBRTC_WIN
+
+#include <openssl/bio.h>
+#include <openssl/bn.h>
+#include <openssl/pem.h>
+#include <time.h>
+
+#include <memory>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/helpers.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/message_digest.h"
+#include "rtc_base/openssl_digest.h"
+#include "rtc_base/openssl_identity.h"
+#include "rtc_base/openssl_utility.h"
+
+namespace rtc {
+namespace {
+
+// Random bits for certificate serial number
+static const int SERIAL_RAND_BITS = 64;
+
+#if !defined(NDEBUG)
+// Print a certificate to the log, for debugging.
+static void PrintCert(X509* x509) {
+ BIO* temp_memory_bio = BIO_new(BIO_s_mem());
+ if (!temp_memory_bio) {
+ RTC_DLOG_F(LS_ERROR) << "Failed to allocate temporary memory bio";
+ return;
+ }
+ X509_print_ex(temp_memory_bio, x509, XN_FLAG_SEP_CPLUS_SPC, 0);
+ BIO_write(temp_memory_bio, "\0", 1);
+ char* buffer;
+ BIO_get_mem_data(temp_memory_bio, &buffer);
+ RTC_DLOG(LS_VERBOSE) << buffer;
+ BIO_free(temp_memory_bio);
+}
+#endif
+
+// Generate a self-signed certificate, with the public key from the
+// given key pair. Caller is responsible for freeing the returned object.
+static X509* MakeCertificate(EVP_PKEY* pkey, const SSLIdentityParams& params) {
+ RTC_LOG(LS_INFO) << "Making certificate for " << params.common_name;
+
+ ASN1_INTEGER* asn1_serial_number = nullptr;
+ std::unique_ptr<BIGNUM, decltype(&::BN_free)> serial_number{nullptr,
+ ::BN_free};
+ std::unique_ptr<X509, decltype(&::X509_free)> x509{nullptr, ::X509_free};
+ std::unique_ptr<X509_NAME, decltype(&::X509_NAME_free)> name{
+ nullptr, ::X509_NAME_free};
+ time_t epoch_off = 0; // Time offset since epoch.
+ x509.reset(X509_new());
+ if (x509 == nullptr) {
+ return nullptr;
+ }
+ if (!X509_set_pubkey(x509.get(), pkey)) {
+ return nullptr;
+ }
+ // serial number - temporary reference to serial number inside x509 struct
+ serial_number.reset(BN_new());
+ if (serial_number == nullptr ||
+ !BN_pseudo_rand(serial_number.get(), SERIAL_RAND_BITS, 0, 0) ||
+ (asn1_serial_number = X509_get_serialNumber(x509.get())) == nullptr ||
+ !BN_to_ASN1_INTEGER(serial_number.get(), asn1_serial_number)) {
+ return nullptr;
+ }
+ // Set version to X509.V3
+ if (!X509_set_version(x509.get(), 2L)) {
+ return nullptr;
+ }
+
+ // There are a lot of possible components for the name entries. In
+ // our P2P SSL mode however, the certificates are pre-exchanged
+ // (through the secure XMPP channel), and so the certificate
+ // identification is arbitrary. It can't be empty, so we set some
+ // arbitrary common_name. Note that this certificate goes out in
+ // clear during SSL negotiation, so there may be a privacy issue in
+ // putting anything recognizable here.
+ name.reset(X509_NAME_new());
+ if (name == nullptr ||
+ !X509_NAME_add_entry_by_NID(name.get(), NID_commonName, MBSTRING_UTF8,
+ (unsigned char*)params.common_name.c_str(),
+ -1, -1, 0) ||
+ !X509_set_subject_name(x509.get(), name.get()) ||
+ !X509_set_issuer_name(x509.get(), name.get())) {
+ return nullptr;
+ }
+ if (!X509_time_adj(X509_get_notBefore(x509.get()), params.not_before,
+ &epoch_off) ||
+ !X509_time_adj(X509_get_notAfter(x509.get()), params.not_after,
+ &epoch_off)) {
+ return nullptr;
+ }
+ if (!X509_sign(x509.get(), pkey, EVP_sha256())) {
+ return nullptr;
+ }
+
+ RTC_LOG(LS_INFO) << "Returning certificate";
+ return x509.release();
+}
+
+} // namespace
+
+OpenSSLCertificate::OpenSSLCertificate(X509* x509) : x509_(x509) {
+ RTC_DCHECK(x509_ != nullptr);
+ X509_up_ref(x509_);
+}
+
+std::unique_ptr<OpenSSLCertificate> OpenSSLCertificate::Generate(
+ OpenSSLKeyPair* key_pair,
+ const SSLIdentityParams& params) {
+ SSLIdentityParams actual_params(params);
+ if (actual_params.common_name.empty()) {
+ // Use a random string, arbitrarily 8chars long.
+ actual_params.common_name = CreateRandomString(8);
+ }
+ X509* x509 = MakeCertificate(key_pair->pkey(), actual_params);
+ if (!x509) {
+ openssl::LogSSLErrors("Generating certificate");
+ return nullptr;
+ }
+#if !defined(NDEBUG)
+ PrintCert(x509);
+#endif
+ auto ret = std::make_unique<OpenSSLCertificate>(x509);
+ X509_free(x509);
+ return ret;
+}
+
+std::unique_ptr<OpenSSLCertificate> OpenSSLCertificate::FromPEMString(
+ absl::string_view pem_string) {
+ BIO* bio = BIO_new_mem_buf(const_cast<char*>(pem_string.data()), -1);
+ if (!bio) {
+ return nullptr;
+ }
+
+ BIO_set_mem_eof_return(bio, 0);
+ X509* x509 =
+ PEM_read_bio_X509(bio, nullptr, nullptr, const_cast<char*>("\0"));
+ BIO_free(bio); // Frees the BIO, but not the pointed-to string.
+
+ if (!x509) {
+ return nullptr;
+ }
+ auto ret = std::make_unique<OpenSSLCertificate>(x509);
+ X509_free(x509);
+ return ret;
+}
+
+// NOTE: This implementation only functions correctly after InitializeSSL
+// and before CleanupSSL.
+bool OpenSSLCertificate::GetSignatureDigestAlgorithm(
+ std::string* algorithm) const {
+ int nid = X509_get_signature_nid(x509_);
+ switch (nid) {
+ case NID_md5WithRSA:
+ case NID_md5WithRSAEncryption:
+ *algorithm = DIGEST_MD5;
+ break;
+ case NID_ecdsa_with_SHA1:
+ case NID_dsaWithSHA1:
+ case NID_dsaWithSHA1_2:
+ case NID_sha1WithRSA:
+ case NID_sha1WithRSAEncryption:
+ *algorithm = DIGEST_SHA_1;
+ break;
+ case NID_ecdsa_with_SHA224:
+ case NID_sha224WithRSAEncryption:
+ case NID_dsa_with_SHA224:
+ *algorithm = DIGEST_SHA_224;
+ break;
+ case NID_ecdsa_with_SHA256:
+ case NID_sha256WithRSAEncryption:
+ case NID_dsa_with_SHA256:
+ *algorithm = DIGEST_SHA_256;
+ break;
+ case NID_ecdsa_with_SHA384:
+ case NID_sha384WithRSAEncryption:
+ *algorithm = DIGEST_SHA_384;
+ break;
+ case NID_ecdsa_with_SHA512:
+ case NID_sha512WithRSAEncryption:
+ *algorithm = DIGEST_SHA_512;
+ break;
+ default:
+ // Unknown algorithm. There are several unhandled options that are less
+ // common and more complex.
+ RTC_LOG(LS_ERROR) << "Unknown signature algorithm NID: " << nid;
+ algorithm->clear();
+ return false;
+ }
+ return true;
+}
+
+bool OpenSSLCertificate::ComputeDigest(absl::string_view algorithm,
+ unsigned char* digest,
+ size_t size,
+ size_t* length) const {
+ return ComputeDigest(x509_, algorithm, digest, size, length);
+}
+
+bool OpenSSLCertificate::ComputeDigest(const X509* x509,
+ absl::string_view algorithm,
+ unsigned char* digest,
+ size_t size,
+ size_t* length) {
+ const EVP_MD* md = nullptr;
+ unsigned int n = 0;
+ if (!OpenSSLDigest::GetDigestEVP(algorithm, &md)) {
+ return false;
+ }
+ if (size < static_cast<size_t>(EVP_MD_size(md))) {
+ return false;
+ }
+ X509_digest(x509, md, digest, &n);
+ *length = n;
+ return true;
+}
+
+OpenSSLCertificate::~OpenSSLCertificate() {
+ X509_free(x509_);
+}
+
+std::unique_ptr<SSLCertificate> OpenSSLCertificate::Clone() const {
+ return std::make_unique<OpenSSLCertificate>(x509_);
+}
+
+std::string OpenSSLCertificate::ToPEMString() const {
+ BIO* bio = BIO_new(BIO_s_mem());
+ RTC_CHECK(bio);
+ RTC_CHECK(PEM_write_bio_X509(bio, x509_));
+ BIO_write(bio, "\0", 1);
+ char* buffer;
+ BIO_get_mem_data(bio, &buffer);
+ std::string ret(buffer);
+ BIO_free(bio);
+ return ret;
+}
+
+void OpenSSLCertificate::ToDER(Buffer* der_buffer) const {
+ // In case of failure, make sure to leave the buffer empty.
+ der_buffer->SetSize(0);
+ // Calculates the DER representation of the certificate, from scratch.
+ BIO* bio = BIO_new(BIO_s_mem());
+ RTC_CHECK(bio);
+ RTC_CHECK(i2d_X509_bio(bio, x509_));
+ char* data = nullptr;
+ size_t length = BIO_get_mem_data(bio, &data);
+ der_buffer->SetData(data, length);
+ BIO_free(bio);
+}
+
+bool OpenSSLCertificate::operator==(const OpenSSLCertificate& other) const {
+ return X509_cmp(x509_, other.x509_) == 0;
+}
+
+bool OpenSSLCertificate::operator!=(const OpenSSLCertificate& other) const {
+ return !(*this == other);
+}
+
+int64_t OpenSSLCertificate::CertificateExpirationTime() const {
+ ASN1_TIME* expire_time = X509_get_notAfter(x509_);
+ bool long_format;
+ if (expire_time->type == V_ASN1_UTCTIME) {
+ long_format = false;
+ } else if (expire_time->type == V_ASN1_GENERALIZEDTIME) {
+ long_format = true;
+ } else {
+ return -1;
+ }
+ return ASN1TimeToSec(expire_time->data, expire_time->length, long_format);
+}
+
+} // namespace rtc