1 files changed, 290 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/openssl_certificate.cc b/third_party/libwebrtc/rtc_base/openssl_certificate.cc
new file mode 100644
index 0000000000..faed72b4db
--- /dev/null
+++ b/third_party/libwebrtc/rtc_base/openssl_certificate.cc
@@ -0,0 +1,290 @@
+/*
+ *  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