Load in-memory CA certificates (#1579)

* Load in-memory CA certs

* Add test cases for in-memory cert loading

* Don't use the IIFE style

httplib.h

@@ -1124,6 +1124,7 @@ public:
   void set_ca_cert_path(const std::string &ca_cert_file_path,
                         const std::string &ca_cert_dir_path = std::string());
   void set_ca_cert_store(X509_STORE *ca_cert_store);
+  X509_STORE *create_ca_cert_store(const char *ca_cert, std::size_t size);
 #endif
 
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
@@ -1504,6 +1505,7 @@ public:
                         const std::string &ca_cert_dir_path = std::string());
 
   void set_ca_cert_store(X509_STORE *ca_cert_store);
+  void load_ca_cert_store(const char *ca_cert, std::size_t size);
 
   long get_openssl_verify_result() const;
 
@@ -1563,6 +1565,7 @@ public:
   bool is_valid() const override;
 
   void set_ca_cert_store(X509_STORE *ca_cert_store);
+  void load_ca_cert_store(const char *ca_cert, std::size_t size);
 
   long get_openssl_verify_result() const;
 
@@ -7590,6 +7593,35 @@ inline void ClientImpl::set_ca_cert_store(X509_STORE *ca_cert_store) {
     ca_cert_store_ = ca_cert_store;
   }
 }
+
+inline X509_STORE *ClientImpl::create_ca_cert_store(const char *ca_cert,
+                                                    std::size_t size) {
+  auto mem = BIO_new_mem_buf(ca_cert, size);
+  if (!mem) return nullptr;
+
+  auto inf = PEM_X509_INFO_read_bio(mem, nullptr, nullptr, nullptr);
+  if (!inf) {
+    BIO_free_all(mem);
+    return nullptr;
+  }
+
+  auto cts = X509_STORE_new();
+  if (cts) {
+    for (int first = 0, last = sk_X509_INFO_num(inf); first < last; ++first) {
+      auto itmp = sk_X509_INFO_value(inf, first);
+      if (!itmp) continue;
+
+      if (itmp->x509) X509_STORE_add_cert(cts, itmp->x509);
+
+      if (itmp->crl) X509_STORE_add_crl(cts, itmp->crl);
+    }
+  }
+
+  sk_X509_INFO_pop_free(inf, X509_INFO_free);
+  BIO_free_all(mem);
+
+  return cts;
+}
 #endif
 
 #ifdef CPPHTTPLIB_OPENSSL_SUPPORT
@@ -7990,6 +8022,11 @@ inline void SSLClient::set_ca_cert_store(X509_STORE *ca_cert_store) {
   }
 }
 
+inline void SSLClient::load_ca_cert_store(const char *ca_cert,
+                                          std::size_t size) {
+  set_ca_cert_store(ClientImpl::create_ca_cert_store(ca_cert, size));
+}
+
 inline long SSLClient::get_openssl_verify_result() const {
   return verify_result_;
 }
@@ -8773,6 +8810,10 @@ inline void Client::set_ca_cert_store(X509_STORE *ca_cert_store) {
   }
 }
 
+inline void Client::load_ca_cert_store(const char *ca_cert, std::size_t size) {
+  set_ca_cert_store(cli_->create_ca_cert_store(ca_cert, size));
+}
+
 inline long Client::get_openssl_verify_result() const {
   if (is_ssl_) {
     return static_cast<SSLClient &>(*cli_).get_openssl_verify_result();

test/test.cc

@@ -4710,6 +4710,49 @@ TEST(SSLClientTest, ServerCertificateVerification4) {
   ASSERT_EQ(200, res->status);
 }
 
+TEST(SSLClientTest, ServerCertificateVerification5_Online) {
+  std::string cert;
+  detail::read_file(CA_CERT_FILE, cert);
+
+  SSLClient cli("google.com");
+  cli.load_ca_cert_store(cert.data(), cert.size());
+  const auto res = cli.Get("/");
+  ASSERT_TRUE(res);
+  ASSERT_EQ(301, res->status);
+}
+
+TEST(SSLClientTest, ServerCertificateVerification6_Online) {
+  // clang-format off
+  static constexpr char cert[] =
+    "GlobalSign Root CA\n"
+    "==================\n"
+    "-----BEGIN CERTIFICATE-----\n"
+    "MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkGA1UEBhMCQkUx\n"
+    "GTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jvb3QgQ0ExGzAZBgNVBAMTEkds\n"
+    "b2JhbFNpZ24gUm9vdCBDQTAeFw05ODA5MDExMjAwMDBaFw0yODAxMjgxMjAwMDBaMFcxCzAJBgNV\n"
+    "BAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYD\n"
+    "VQQDExJHbG9iYWxTaWduIFJvb3QgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDa\n"
+    "DuaZjc6j40+Kfvvxi4Mla+pIH/EqsLmVEQS98GPR4mdmzxzdzxtIK+6NiY6arymAZavpxy0Sy6sc\n"
+    "THAHoT0KMM0VjU/43dSMUBUc71DuxC73/OlS8pF94G3VNTCOXkNz8kHp1Wrjsok6Vjk4bwY8iGlb\n"
+    "Kk3Fp1S4bInMm/k8yuX9ifUSPJJ4ltbcdG6TRGHRjcdGsnUOhugZitVtbNV4FpWi6cgKOOvyJBNP\n"
+    "c1STE4U6G7weNLWLBYy5d4ux2x8gkasJU26Qzns3dLlwR5EiUWMWea6xrkEmCMgZK9FGqkjWZCrX\n"
+    "gzT/LCrBbBlDSgeF59N89iFo7+ryUp9/k5DPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV\n"
+    "HRMBAf8EBTADAQH/MB0GA1UdDgQWBBRge2YaRQ2XyolQL30EzTSo//z9SzANBgkqhkiG9w0BAQUF\n"
+    "AAOCAQEA1nPnfE920I2/7LqivjTFKDK1fPxsnCwrvQmeU79rXqoRSLblCKOzyj1hTdNGCbM+w6Dj\n"
+    "Y1Ub8rrvrTnhQ7k4o+YviiY776BQVvnGCv04zcQLcFGUl5gE38NflNUVyRRBnMRddWQVDf9VMOyG\n"
+    "j/8N7yy5Y0b2qvzfvGn9LhJIZJrglfCm7ymPAbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhH\n"
+    "hm4qxFYxldBniYUr+WymXUadDKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveC\n"
+    "X4XSQRjbgbMEHMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==\n"
+    "-----END CERTIFICATE-----\n";
+  // clang-format on
+
+  SSLClient cli("google.com");
+  cli.load_ca_cert_store(cert, sizeof(cert));
+  const auto res = cli.Get("/");
+  ASSERT_TRUE(res);
+  ASSERT_EQ(301, res->status);
+}
+
 TEST(SSLClientTest, WildcardHostNameMatch_Online) {
   SSLClient cli("www.youtube.com");