rstudio/src/cpp/core/http/Ssl.cpp at main · ssh352/rstudio · GitHub

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* Ssl.cpp

* Unless you have received this program directly from Posit Software pursuant

* to the terms of a commercial license agreement with Posit Software, then

* this program is licensed to you under the terms of version 3 of the

* GNU Affero General Public License. This program is distributed WITHOUT

* ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,

* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the

* AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.

#include <core/http/Ssl.hpp>

#include <core/Log.hpp>

#ifdef _WIN32

#include <windows.h>

#include <wincrypt.h>

#include <cryptuiapi.h>

#include <openssl/x509.h>

#endif

#ifdef __APPLE__

#include <core/http/Keychain.hpp>

#include <openssl/x509.h>

#endif

namespace rstudio {

namespace core {

namespace http {

namespace ssl {

namespace {

#if defined(_WIN32) || defined(__APPLE__)

class ICertStore

{

public:

virtual std::vector<X509*> getCertificates() const = 0;

virtual ~ICertStore() {}

};

#endif

#ifdef _WIN32

class WindowsCertificateStore : public ICertStore

{

public:

WindowsCertificateStore()

{

// load certificates from important stores

LPCSTR stores[] = {"ROOT", "CA"};

for (const LPCSTR& store : stores)

{

HCERTSTORE hStore = CertOpenSystemStore(NULL, store);

if (!hStore)

{

LOG_ERROR_MESSAGE("Could not open certificate store");

return;

}

PCCERT_CONTEXT pContext = nullptr;

while (pContext = CertEnumCertificatesInStore(hStore, pContext))

{

// convert the certificate returned from the Windows store into a

// format that OpenSSL can understand

const BYTE* certPtr = pContext->pbCertEncoded;

X509* x509 = d2i_X509(nullptr, &certPtr, pContext->cbCertEncoded);

if (x509)

{

certificates.push_back(x509);

}

else

{

boost::system::error_code ec = boost::system::error_code(

static_cast<int>(::ERR_get_error()),

boost::asio::error::get_ssl_category());

Error error(ec, ERROR_LOCATION);

error.addProperty("description",

"Could not create OpenSSL certificate object from Windows certificate data");

LOG_DEBUG_MESSAGE(error.asString());

}

CertCloseStore(hStore, 0);

}

// note to caller - the certificate data (X509 pointers) here must not be freed as the data

// must persist for the lifetime of the process

std::vector<X509*> getCertificates() const

{

return certificates;

}

private:

// certificate pointers - these are intentionally leaked

// as they need to be available for the entire run of the program

std::vector<X509*> certificates;

};

static const ICertStore& getCertificateStore()

{

// Meyer's singleton - guarantees this is thread safe

// and will be initialized exactly once by the first caller

static WindowsCertificateStore instance;

return instance;

}

#endif

#ifdef __APPLE__

class Keychain : public ICertStore

{

public:

Keychain()

{

// load all certs from the keychain

std::vector<KeychainCertificateData> certs = getKeychainCertificates();

for (const auto& cert : certs)

{

// convert the raw bytes from the keychain into a format that OpenSSL can understand

const unsigned char* bytePtr = cert.data.get();

X509* x509 = d2i_X509(nullptr, &bytePtr, cert.size);

if (x509)

{

certificates.push_back(x509);

}

else

{

boost::system::error_code ec = boost::system::error_code(

static_cast<int>(::ERR_get_error()),

boost::asio::error::get_ssl_category());

Error error(ec, ERROR_LOCATION);

error.addProperty("description",

"Could not create OpenSSL certificate object from Keychain certificate data");

LOG_DEBUG_MESSAGE(error.asString());

}

// note to caller - the certificate data (X509 pointers) here must not be freed as the data

// must persist for the lifetime of the process

std::vector<X509*> getCertificates() const

{

return certificates;

}

private:

// certificate pointers - these are intentionally leaked

// as they need to be available for the entire run of the program

std::vector<X509*> certificates;

};

static const ICertStore& getKeychain()

{

// Meyer's singleton - guarantees this is thread safe

// and will be initialized exactly once by the first caller

static Keychain instance;

return instance;

}

#endif

} // namespace

void initializeSslContext(boost::asio::ssl::context* pContext,

bool verify,

const std::string& certificateAuthority)

{

if (verify)

{

boost::system::error_code ec;

pContext->set_verify_mode(boost::asio::ssl::context::verify_peer, ec);

if (ec)

{

LOG_ERROR(Error(ec, "Could not enable certificate verification on SSL context", ERROR_LOCATION));

ec.clear();

}

pContext->set_default_verify_paths(ec);

if (ec)

{

LOG_ERROR(Error(ec, "Could not set default certificate verification paths on SSL context", ERROR_LOCATION));

ec.clear();

}

if (!certificateAuthority.empty())

{

boost::asio::const_buffer buff(certificateAuthority.data(), certificateAuthority.size());

pContext->add_certificate_authority(buff, ec);

if (ec)

{

LOG_ERROR(Error(ec, "Could not add certificate authority to SSL context - is it valid?", ERROR_LOCATION));

ec.clear();

}

#ifdef _WIN32

// on Windows, OpenSSL does not support loading certificates from the Windows certificate store

// because of this, each time we need to verify certificates, we initialize

// all certificates individually with OpenSSL

const ICertStore& certStore = getCertificateStore();

#endif

#ifdef __APPLE__

// on OSX, OpenSSL does not support loading certificates from the Keychain

// because of this, each time we need to verify certificates, we initialize

// all certificates individually with OpenSSL, similar to what is done above for Windows

const ICertStore& certStore = getKeychain();

#endif

#if defined(__APPLE__) || defined(_WIN32)

for (const auto& cert : certStore.getCertificates())

{

if (X509_STORE* store = SSL_CTX_get_cert_store(pContext->native_handle()))

{

if (::X509_STORE_add_cert(store, cert) != 1)

{

char* subjectName = X509_NAME_oneline(X509_get_subject_name(cert), nullptr, 0);

std::string subjectNameStr(subjectName);

OPENSSL_free(subjectName);

ec = boost::system::error_code(

static_cast<int>(::ERR_get_error()),

boost::asio::error::get_ssl_category());

Error error(ec, ERROR_LOCATION);

error.addProperty("description", "Could not add certificate to OpenSSL cert store: " + subjectNameStr);

LOG_ERROR(error);

}

#endif

}

else

{

boost::system::error_code ec;

pContext->set_verify_mode(boost::asio::ssl::context::verify_none, ec);

if (ec)

LOG_ERROR(Error(ec, "Could not disable certificate verification on SSL context", ERROR_LOCATION));

}

void initializeSslStream(boost::asio::ssl::stream<boost::asio::ip::tcp::socket>* pSslStream,

const std::string& host)

{

// TLS v1.3 requires that the SNI be set, so set the SNI.

if (!SSL_set_tlsext_host_name(pSslStream->native_handle(), host.c_str()))

{

boost::system::error_code ec{ static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category() };

LOG_ERROR(Error(ec, ERROR_LOCATION));

}

} // namespace ssl

} // namespace http

} // namespace core

} // namespace rstudio

rstudio/src/cpp/core/http/Ssl.cpp at main · ssh352/rstudio · GitHub

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