blob: 1984eb0706d7849c50d8506ec501908d671bb04d [file] [log] [blame]
/*
* Copyright 2018 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_utility.h"
#if defined(WEBRTC_WIN)
// Must be included first before openssl headers.
#include "rtc_base/win32.h" // NOLINT
#endif // WEBRTC_WIN
#include <openssl/err.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <stddef.h>
#include "rtc_base/arraysize.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_conversions.h"
#include "rtc_base/openssl.h"
#include "rtc_base/openssl_certificate.h"
#ifndef WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS
#include "rtc_base/ssl_roots.h"
#endif // WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS
namespace rtc {
namespace openssl {
// Holds various helper methods.
namespace {
void LogCertificates(SSL* ssl, X509* certificate) {
// Logging certificates is extremely verbose. So it is disabled by default.
#ifdef LOG_CERTIFICATES
BIO* mem = BIO_new(BIO_s_mem());
if (mem == nullptr) {
RTC_DLOG(LS_ERROR) << "BIO_new() failed to allocate memory.";
return;
}
RTC_DLOG(LS_INFO) << "Certificate from server:";
X509_print_ex(mem, certificate, XN_FLAG_SEP_CPLUS_SPC, X509_FLAG_NO_HEADER);
BIO_write(mem, "\0", 1);
char* buffer = nullptr;
BIO_get_mem_data(mem, &buffer);
if (buffer != nullptr) {
RTC_DLOG(LS_INFO) << buffer;
} else {
RTC_DLOG(LS_ERROR) << "BIO_get_mem_data() failed to get buffer.";
}
BIO_free(mem);
const char* cipher_name = SSL_CIPHER_get_name(SSL_get_current_cipher(ssl));
if (cipher_name != nullptr) {
RTC_DLOG(LS_INFO) << "Cipher: " << cipher_name;
} else {
RTC_DLOG(LS_ERROR) << "SSL_CIPHER_DESCRIPTION() failed to get cipher_name.";
}
#endif
}
} // namespace
bool VerifyPeerCertMatchesHost(SSL* ssl, const std::string& host) {
if (host.empty()) {
RTC_DLOG(LS_ERROR) << "Hostname is empty. Cannot verify peer certificate.";
return false;
}
if (ssl == nullptr) {
RTC_DLOG(LS_ERROR) << "SSL is nullptr. Cannot verify peer certificate.";
return false;
}
X509* certificate = SSL_get_peer_certificate(ssl);
if (certificate == nullptr) {
RTC_DLOG(LS_ERROR)
<< "SSL_get_peer_certificate failed. This should never happen.";
return false;
}
LogCertificates(ssl, certificate);
bool is_valid_cert_name =
X509_check_host(certificate, host.c_str(), host.size(), 0, nullptr) == 1;
X509_free(certificate);
return is_valid_cert_name;
}
void LogSSLErrors(const std::string& prefix) {
char error_buf[200];
unsigned long err; // NOLINT
while ((err = ERR_get_error()) != 0) {
ERR_error_string_n(err, error_buf, sizeof(error_buf));
RTC_LOG(LS_ERROR) << prefix << ": " << error_buf << "\n";
}
}
#ifndef WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS
bool LoadBuiltinSSLRootCertificates(SSL_CTX* ctx) {
int count_of_added_certs = 0;
for (size_t i = 0; i < arraysize(kSSLCertCertificateList); i++) {
const unsigned char* cert_buffer = kSSLCertCertificateList[i];
size_t cert_buffer_len = kSSLCertCertificateSizeList[i];
X509* cert = d2i_X509(nullptr, &cert_buffer,
checked_cast<long>(cert_buffer_len)); // NOLINT
if (cert) {
int return_value = X509_STORE_add_cert(SSL_CTX_get_cert_store(ctx), cert);
if (return_value == 0) {
RTC_LOG(LS_WARNING) << "Unable to add certificate.";
} else {
count_of_added_certs++;
}
X509_free(cert);
}
}
return count_of_added_certs > 0;
}
#endif // WEBRTC_EXCLUDE_BUILT_IN_SSL_ROOT_CERTS
} // namespace openssl
} // namespace rtc