Hostname verification (djarek#67)

* Add failing Test

* Fix Testnames in Cmake Config

* Set Servername for OpenSSL in Tests

Makes the wrong hostname test work for system that do not need the native verification

* Set Verification Callback via SSL_CTX_set_verify

Also remove some unnecessary functions in verification_utils.hpp

This fixes hostname verification on systems that use the native implementations

* Update Github Test Chain

Test failed with "self signed certificate in certificate chain in function"

* Silence Conversion Warning size_t->DWORD

* Add missing openssl includes

* Fix error in appveyor build

X509_STORE_get0_param was only introduced in OpenSSL1.1.0
The Appveyor build uses OpenSSL 1.0.2
Use X509_STORE_CTX_get0_param from within store_ctx instead

* Fix spki digest test

I previously updated the old (expired) Github cert chain,
inadvertently breaking the test.

Re-add it to the fail_chains and adapt the test report_errors.

Author: jens-diewald

include/boost/certify/detail/keystore_windows.ipp

@@ -96,7 +96,7 @@ BOOST_CERTIFY_DECL std::unique_ptr<::CERT_CONTEXT const, cert_context_deleter>
     if (!CertAddEncodedCertificateToStore(store.get(),
                                           X509_ASN_ENCODING,
                                           buffer.data(),
-                                          buffer.size(),
+                                          static_cast<DWORD>(buffer.size()),
                                           CERT_STORE_ADD_ALWAYS,
                                           &leaf_cert))
         return nullptr;
@@ -110,7 +110,7 @@ BOOST_CERTIFY_DECL std::unique_ptr<::CERT_CONTEXT const, cert_context_deleter>
         if (!CertAddEncodedCertificateToStore(store.get(),
                                               X509_ASN_ENCODING,
                                               buffer.data(),
-                                              buffer.size(),
+                                              static_cast<DWORD>(buffer.size()),
                                               CERT_STORE_ADD_ALWAYS,
                                               nullptr))
             return nullptr;

include/boost/certify/https_verification.hpp

@@ -22,7 +22,7 @@ set_server_hostname(::SSL* handle,
                     system::error_code& ec);
 
 extern "C" inline int
-verify_server_certificates(::X509_STORE_CTX* ctx, void*) noexcept;
+verify_server_certificates(int preverified, X509_STORE_CTX* ctx) noexcept;
 
 } // namespace detail
 } // namespace certify

include/boost/certify/impl/https_verification.ipp

@@ -1,10 +1,11 @@
-#ifndef BOOST_CERTIFY_IMPL_RFC2818_VERIFICATION_IPP
-#define BOOST_CERTIFY_IMPL_RFC2818_VERIFICATION_IPP
+#ifndef BOOST_CERTIFY_IMPL_HTTPS_VERIFICATION_IPP
+#define BOOST_CERTIFY_IMPL_HTTPS_VERIFICATION_IPP
 
 #include <boost/certify/https_verification.hpp>
 
 #include <boost/asio/ip/address.hpp>
-#include <openssl/x509v3.h>
+#include <openssl/ssl.h>
+#include <openssl/x509_vfy.h>
 
 namespace boost
 {
@@ -14,9 +15,9 @@ namespace detail
 {
 
 extern "C" BOOST_CERTIFY_DECL int
-verify_server_certificates(::X509_STORE_CTX* ctx, void*) noexcept
+verify_server_certificates(int preverified, X509_STORE_CTX* ctx) noexcept
 {
-    if (::X509_verify_cert(ctx) == 1)
+    if (preverified == 1)
         return true;
 
     auto const err = ::X509_STORE_CTX_get_error(ctx);
@@ -33,9 +34,8 @@ verify_server_certificates(::X509_STORE_CTX* ctx, void*) noexcept
 }
 
 void
-set_server_hostname(::SSL* handle, string_view hostname, system::error_code& ec)
+set_server_hostname(::X509_VERIFY_PARAM* param, string_view hostname, system::error_code& ec)
 {
-    auto* param = ::SSL_get0_param(handle);
     ::X509_VERIFY_PARAM_set_hostflags(param,
                                       X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
     // TODO(djarek): OpenSSL doesn't report an error here?
@@ -46,16 +46,25 @@ set_server_hostname(::SSL* handle, string_view hostname, system::error_code& ec)
         ec = {};
 }
 
+void
+set_server_hostname(::SSL* handle, string_view hostname, system::error_code& ec)
+{
+    auto* param = ::SSL_get0_param(handle);
+    set_server_hostname(param, hostname, ec);
+}
+
+
 } // namespace detail
 
 BOOST_CERTIFY_DECL void
 enable_native_https_server_verification(asio::ssl::context& context)
 {
-    ::SSL_CTX_set_cert_verify_callback(
-      context.native_handle(), &detail::verify_server_certificates, nullptr);
+    ::SSL_CTX_set_verify(context.native_handle(),
+                         ::SSL_CTX_get_verify_mode(context.native_handle()),
+                         &detail::verify_server_certificates);
 }
 
 } // namespace certify
 } // namespace boost
 
-#endif // BOOST_CERTIFY_IMPL_RFC2818_VERIFICATION_IPP
+#endif // BOOST_CERTIFY_IMPL_HTTPS_VERIFICATION_IPP

tests/CMakeLists.txt

@@ -11,5 +11,5 @@ function (certify_verify_add_test test_file)
              COMMAND ${target_name})
 endfunction(certify_verify_add_test)
 
-certify_verify_add_test(rfc2818_verification_success.cpp)
-certify_verify_add_test(rfc2818_verification_fail.cpp)
+certify_verify_add_test(https_verification_success.cpp)
+certify_verify_add_test(https_verification_fail.cpp)

tests/detail_spki_digest.cpp

@@ -9,7 +9,7 @@ main()
     ::SSL_library_init();
 
     auto chain = boost::certify::certificate_chain::from_file(
-      "libs/certify/tests/res/success_chains/github.com.crt");
+      "libs/certify/tests/res/fail_chains/github.com.crt");
 
     std::array<std::array<unsigned char, 32>, 3> const expected = {
       {{{0xa3, 0x9a, 0x1a, 0xe4, 0x5e, 0x0b, 0x6d, 0x91, 0x1f, 0x79, 0x9d,

tests/extras/include/boost/certify/verification_utils.hpp

@@ -1,9 +1,15 @@
+#ifndef BOOST_CERTIFY_VERIFICATION_UTILS_HPP
+#define BOOST_CERTIFY_VERIFICATION_UTILS_HPP
+
 #include <boost/certify/https_verification.hpp>
 
 #include <boost/asio/ssl/error.hpp>
 #include <boost/filesystem/operations.hpp>
 #include <boost/filesystem/path.hpp>
 #include <boost/system/error_code.hpp>
+#include <boost/utility/string_view.hpp>
+#include <openssl/pem.h>
+#include <openssl/x509.h>
 
 namespace boost
 {
@@ -125,9 +131,6 @@ get_store_ctx_category()
     return instance;
 }
 
-extern "C" inline int
-verify_callback(int preverified, X509_STORE_CTX* ctx);
-
 class store_ctx
 {
 public:
@@ -154,6 +157,8 @@ class store_ctx
                   boost::asio::error::get_ssl_category()};
             boost::throw_exception(system::system_error{ec});
         }
+        ::X509_STORE_CTX_set_verify_cb(handle_.get(),
+                                       &detail::verify_server_certificates);
     }
 
     store_ctx(store_ctx const&) = delete;
@@ -164,25 +169,23 @@ class store_ctx
 
     ~store_ctx() = default;
 
-    template<typename T>
-    void set_verify_callback(T&& t)
+    native_handle_type native_handle() const
     {
-        callback_ = std::forward<T>(t);
-        ::X509_STORE_CTX_set_verify_cb(handle_.get(), &verify_callback);
-        auto const ret =
-          ::X509_STORE_CTX_set_ex_data(handle_.get(), get_ex_index(), this);
-        assert(ret == 1);
+        return handle_.get();
     }
 
-    native_handle_type native_handle() const
+    void set_server_hostname(string_view hostname)
     {
-        return handle_.get();
+        auto* param = ::X509_STORE_CTX_get0_param(handle_.get());
+        system::error_code ec;
+        detail::set_server_hostname(param, hostname, ec);
+        if (ec)
+            boost::throw_exception(system::system_error{ec});
     }
 
     void verify(system::error_code& ec)
     {
-        auto ret =
-          certify::detail::verify_server_certificates(handle_.get(), nullptr);
+        auto ret = ::X509_verify_cert(handle_.get());
         if (ret != 1)
         {
             auto const err = ::X509_STORE_CTX_get_error(handle_.get());
@@ -201,18 +204,6 @@ class store_ctx
     }
 
 private:
-    friend int verify_callback(int preverified, X509_STORE_CTX* ctx);
-
-    static int get_ex_index()
-    {
-        static int const index = []() {
-            return ::X509_STORE_CTX_get_ex_new_index(
-              0, nullptr, nullptr, nullptr, nullptr);
-        }();
-
-        return index;
-    }
-
     struct free
     {
         void operator()(native_handle_type h)
@@ -222,19 +213,8 @@ class store_ctx
     };
 
     std::unique_ptr<::X509_STORE_CTX, free> handle_;
-    std::function<int(bool, boost::asio::ssl::verify_context&)> callback_;
 };
 
-extern "C" inline int
-verify_callback(int preverified, X509_STORE_CTX* ctx)
-{
-    boost::asio::ssl::verify_context verify_ctx{ctx};
-    void* const p = X509_STORE_CTX_get_ex_data(ctx, store_ctx::get_ex_index());
-    BOOST_ASSERT(p != nullptr);
-    auto& sctx = *static_cast<store_ctx*>(p);
-    return sctx.callback_(preverified == 1, verify_ctx);
-}
-
 void
 verify_chain(boost::filesystem::path const& chain_path,
              boost::certify::certificate_store& store,
@@ -245,8 +225,12 @@ verify_chain(boost::filesystem::path const& chain_path,
 
     auto cert_chain = boost::certify::certificate_chain::from_file(chain_path);
     boost::certify::store_ctx ctx{cert_chain, store};
+    ctx.set_server_hostname(chain_path.stem().string());
     ctx.verify(ec);
 }
 
 } // namespace certify
 } // namespace boost
+
+#endif // BOOST_CERTIFY_VERIFICATION_UTILS_HPP
+

tests/res/fail_chains/github.com.crt

@@ -0,0 +1,93 @@
+Old certificate chain, expired Jun 03, 2020.
+-----BEGIN CERTIFICATE-----
+MIIHQjCCBiqgAwIBAgIQCgYwQn9bvO1pVzllk7ZFHzANBgkqhkiG9w0BAQsFADB1
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

tests/res/fail_chains/wrong.host.badssl.com.crt

@@ -0,0 +1,65 @@
+-----BEGIN CERTIFICATE-----
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