secret: add secret provider interface and use it for TlsCertificates

include/envoy/secret/BUILD

@@ -8,11 +8,19 @@ load(
 
 envoy_package()
 
+envoy_cc_library(
+    name = "secret_provider_interface",
+    hdrs = ["secret_provider.h"],
+    deps = [
+        "//include/envoy/ssl:tls_certificate_config_interface",
+    ],
+)
+
 envoy_cc_library(
     name = "secret_manager_interface",
     hdrs = ["secret_manager.h"],
     deps = [
-        "//include/envoy/ssl:tls_certificate_config_interface",
+        ":secret_provider_interface",
         "@envoy_api//envoy/api/v2/auth:cert_cc",
     ],
 )

include/envoy/secret/secret_manager.h

@@ -3,7 +3,7 @@
 #include <string>
 
 #include "envoy/api/v2/auth/cert.pb.h"
-#include "envoy/ssl/tls_certificate_config.h"
+#include "envoy/secret/secret_provider.h"
 
 namespace Envoy {
 namespace Secret {
@@ -18,16 +18,25 @@ class SecretManager {
   virtual ~SecretManager() {}
 
   /**
-   * @param secret a protobuf message of envoy::api::v2::auth::Secret.
-   * @throw an EnvoyException if the secret is invalid or not supported.
+   * @param add a static secret from envoy::api::v2::auth::Secret.
+   * @throw an EnvoyException if the secret is invalid or not supported, or there is duplicate.
    */
-  virtual void addOrUpdateSecret(const envoy::api::v2::auth::Secret& secret) PURE;
+  virtual void addStaticSecret(const envoy::api::v2::auth::Secret& secret) PURE;
 
   /**
-   * @param name a name of the Ssl::TlsCertificateConfig.
-   * @return the TlsCertificate secret. Returns nullptr if the secret is not found.
+   * @param name a name of the static TlsCertificateConfigProvider.
+   * @return the TlsCertificateConfigProviderSharedPtr. Returns nullptr if the static secret is not
+   * found.
    */
-  virtual const Ssl::TlsCertificateConfig* findTlsCertificate(const std::string& name) const PURE;
+  virtual TlsCertificateConfigProviderSharedPtr
+  findStaticTlsCertificateProvider(const std::string& name) const PURE;
+
+  /**
+   * @param tls_certificate the protobuf config of the TLS certificate.
+   * @return a TlsCertificateConfigProviderSharedPtr created from tls_certificate.
+   */
+  virtual TlsCertificateConfigProviderSharedPtr createInlineTlsCertificateProvider(
+      const envoy::api::v2::auth::TlsCertificate& tls_certificate) PURE;
 };
 
 } // namespace Secret

include/envoy/secret/secret_provider.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "envoy/common/pure.h"
+#include "envoy/ssl/tls_certificate_config.h"
+
+namespace Envoy {
+namespace Secret {
+
+/**
+ * A secret provider for each kind of secrets.
+ */
+template <class SecretType> class SecretProvider {
+public:
+  virtual ~SecretProvider() {}
+
+  /**
+   * @return the secret. Returns nullptr if the secret is not ready.
+   */
+  virtual const SecretType* secret() const PURE;
+
+  // TODO(lizan): Add more methods for dynamic secret provider.
+};
+
+typedef SecretProvider<Ssl::TlsCertificateConfig> TlsCertificateConfigProvider;
+typedef std::shared_ptr<TlsCertificateConfigProvider> TlsCertificateConfigProviderSharedPtr;
+
+} // namespace Secret
+} // namespace Envoy

include/envoy/ssl/context_config.h

@@ -60,6 +60,7 @@ class ContextConfig {
    */
   virtual const std::string& certificateRevocationListPath() const PURE;
 
+  // TODO(lizan): consider refactor 4 methods below to Ssl::TlsCertificateConfig
   /**
    * @return The certificate chain used to identify the local side.
    */

include/envoy/ssl/tls_certificate_config.h

@@ -17,10 +17,22 @@ class TlsCertificateConfig {
    */
   virtual const std::string& certificateChain() const PURE;
 
+  /**
+   * @return Path of the certificate chain used to identify the local side or "<inline>"
+   * if the certificate chain was inlined.
+   */
+  virtual const std::string& certificateChainPath() const PURE;
+
   /**
    * @return a string of private key
    */
   virtual const std::string& privateKey() const PURE;
+
+  /**
+   * @return Path of the private key used to identify the local side or "<inline>"
+   * if the private key was inlined.
+   */
+  virtual const std::string& privateKeyPath() const PURE;
 };
 
 typedef std::unique_ptr<TlsCertificateConfig> TlsCertificateConfigPtr;

source/common/config/datasource.cc

@@ -25,9 +25,10 @@ std::string read(const envoy::api::v2::core::DataSource& source, bool allow_empt
   }
 }
 
-std::string getPath(const envoy::api::v2::core::DataSource& source) {
-  return source.specifier_case() == envoy::api::v2::core::DataSource::kFilename ? source.filename()
-                                                                                : "";
+absl::optional<std::string> getPath(const envoy::api::v2::core::DataSource& source) {
+  return source.specifier_case() == envoy::api::v2::core::DataSource::kFilename
+             ? absl::make_optional(source.filename())
+             : absl::nullopt;
 }
 
 } // namespace DataSource

source/common/config/datasource.h

@@ -2,6 +2,8 @@
 
 #include "envoy/api/v2/core/base.pb.h"
 
+#include "absl/types/optional.h"
+
 namespace Envoy {
 namespace Config {
 namespace DataSource {
@@ -19,7 +21,7 @@ std::string read(const envoy::api::v2::core::DataSource& source, bool allow_empt
  * @param source data source.
  * @return std::string path to DataSource if a filename, otherwise an empty string.
  */
-std::string getPath(const envoy::api::v2::core::DataSource& source);
+absl::optional<std::string> getPath(const envoy::api::v2::core::DataSource& source);
 
 } // namespace DataSource
 } // namespace Config

source/common/secret/BUILD

@@ -13,8 +13,19 @@ envoy_cc_library(
     srcs = ["secret_manager_impl.cc"],
     hdrs = ["secret_manager_impl.h"],
     deps = [
+        ":secret_provider_impl_lib",
         "//include/envoy/secret:secret_manager_interface",
         "//source/common/common:minimal_logger_lib",
+        "@envoy_api//envoy/api/v2/auth:cert_cc",
+    ],
+)
+
+envoy_cc_library(
+    name = "secret_provider_impl_lib",
+    srcs = ["secret_provider_impl.cc"],
+    hdrs = ["secret_provider_impl.h"],
+    deps = [
+        "//include/envoy/secret:secret_provider_interface",
         "//source/common/ssl:tls_certificate_config_impl_lib",
         "@envoy_api//envoy/api/v2/auth:cert_cc",
     ],

source/common/secret/secret_manager_impl.cc

@@ -2,26 +2,39 @@
 
 #include "envoy/common/exception.h"
 
+#include "common/common/assert.h"
+#include "common/secret/secret_provider_impl.h"
 #include "common/ssl/tls_certificate_config_impl.h"
 
 namespace Envoy {
 namespace Secret {
 
-void SecretManagerImpl::addOrUpdateSecret(const envoy::api::v2::auth::Secret& secret) {
+void SecretManagerImpl::addStaticSecret(const envoy::api::v2::auth::Secret& secret) {
   switch (secret.type_case()) {
-  case envoy::api::v2::auth::Secret::TypeCase::kTlsCertificate:
-    tls_certificate_secrets_[secret.name()] =
-        std::make_unique<Ssl::TlsCertificateConfigImpl>(secret.tls_certificate());
+  case envoy::api::v2::auth::Secret::TypeCase::kTlsCertificate: {
+    auto secret_provider =
+        std::make_shared<TlsCertificateConfigProviderImpl>(secret.tls_certificate());
+    if (!static_tls_certificate_providers_.insert(std::make_pair(secret.name(), secret_provider))
+             .second) {
+      throw EnvoyException(
+          fmt::format("Duplicate static TlsCertificate secret name {}", secret.name()));
+    }
     break;
+  }
   default:
     throw EnvoyException("Secret type not implemented");
   }
 }
 
-const Ssl::TlsCertificateConfig*
-SecretManagerImpl::findTlsCertificate(const std::string& name) const {
-  auto secret = tls_certificate_secrets_.find(name);
-  return (secret != tls_certificate_secrets_.end()) ? secret->second.get() : nullptr;
+TlsCertificateConfigProviderSharedPtr
+SecretManagerImpl::findStaticTlsCertificateProvider(const std::string& name) const {
+  auto secret = static_tls_certificate_providers_.find(name);
+  return (secret != static_tls_certificate_providers_.end()) ? secret->second : nullptr;
+}
+
+TlsCertificateConfigProviderSharedPtr SecretManagerImpl::createInlineTlsCertificateProvider(
+    const envoy::api::v2::auth::TlsCertificate& tls_certificate) {
+  return std::make_shared<TlsCertificateConfigProviderImpl>(tls_certificate);
 }
 
 } // namespace Secret

source/common/secret/secret_manager_impl.h

@@ -3,6 +3,7 @@
 #include <unordered_map>
 
 #include "envoy/secret/secret_manager.h"
+#include "envoy/secret/secret_provider.h"
 #include "envoy/ssl/tls_certificate_config.h"
 
 #include "common/common/logger.h"
@@ -12,11 +13,15 @@ namespace Secret {
 
 class SecretManagerImpl : public SecretManager, Logger::Loggable<Logger::Id::upstream> {
 public:
-  void addOrUpdateSecret(const envoy::api::v2::auth::Secret& secret) override;
-  const Ssl::TlsCertificateConfig* findTlsCertificate(const std::string& name) const override;
+  void addStaticSecret(const envoy::api::v2::auth::Secret& secret) override;
+  TlsCertificateConfigProviderSharedPtr
+  findStaticTlsCertificateProvider(const std::string& name) const override;
+  TlsCertificateConfigProviderSharedPtr createInlineTlsCertificateProvider(
+      const envoy::api::v2::auth::TlsCertificate& tls_certificate) override;
 
 private:
-  std::unordered_map<std::string, Ssl::TlsCertificateConfigPtr> tls_certificate_secrets_;
+  std::unordered_map<std::string, TlsCertificateConfigProviderSharedPtr>
+      static_tls_certificate_providers_;
 };
 
 } // namespace Secret

source/common/secret/secret_provider_impl.cc

@@ -0,0 +1,14 @@
+#include "common/secret/secret_provider_impl.h"
+
+#include "common/common/assert.h"
+#include "common/ssl/tls_certificate_config_impl.h"
+
+namespace Envoy {
+namespace Secret {
+
+TlsCertificateConfigProviderImpl::TlsCertificateConfigProviderImpl(
+    const envoy::api::v2::auth::TlsCertificate& tls_certificate)
+    : tls_certificate_(std::make_unique<Ssl::TlsCertificateConfigImpl>(tls_certificate)) {}
+
+} // namespace Secret
+} // namespace Envoy

source/common/secret/secret_provider_impl.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "envoy/api/v2/auth/cert.pb.h"
+#include "envoy/secret/secret_provider.h"
+#include "envoy/ssl/tls_certificate_config.h"
+
+namespace Envoy {
+namespace Secret {
+
+class TlsCertificateConfigProviderImpl : public TlsCertificateConfigProvider {
+public:
+  TlsCertificateConfigProviderImpl(const envoy::api::v2::auth::TlsCertificate& tls_certificate);
+
+  const Ssl::TlsCertificateConfig* secret() const override { return tls_certificate_.get(); }
+
+private:
+  Ssl::TlsCertificateConfigPtr tls_certificate_;
+};
+
+} // namespace Secret
+} // namespace Envoy

source/common/ssl/BUILD

@@ -35,6 +35,7 @@ envoy_cc_library(
     ],
     deps = [
         "//include/envoy/secret:secret_manager_interface",
+        "//include/envoy/secret:secret_provider_interface",
         "//include/envoy/ssl:context_config_interface",
         "//source/common/common:assert_lib",
         "//source/common/common:empty_string",
@@ -78,6 +79,7 @@ envoy_cc_library(
     hdrs = ["tls_certificate_config_impl.h"],
     deps = [
         "//include/envoy/ssl:tls_certificate_config_interface",
+        "//source/common/common:empty_string",
         "//source/common/config:datasource_lib",
         "@envoy_api//envoy/api/v2/auth:cert_cc",
     ],

source/common/ssl/context_config_impl.cc

@@ -16,23 +16,28 @@ namespace Ssl {
 
 namespace {
 
-std::string readConfig(
-    const envoy::api::v2::auth::CommonTlsContext& config, Secret::SecretManager& secret_manager,
-    const std::function<std::string(const envoy::api::v2::auth::TlsCertificate& tls_certificate)>&
-        read_inline_config,
-    const std::function<std::string(const Ssl::TlsCertificateConfig& secret)>& read_secret) {
+Secret::TlsCertificateConfigProviderSharedPtr
+getTlsCertificateConfigProvider(const envoy::api::v2::auth::CommonTlsContext& config,
+                                Secret::SecretManager& secret_manager) {
   if (!config.tls_certificates().empty()) {
-    return read_inline_config(config.tls_certificates()[0]);
-  } else if (!config.tls_certificate_sds_secret_configs().empty()) {
-    auto name = config.tls_certificate_sds_secret_configs()[0].name();
-    const Ssl::TlsCertificateConfig* secret = secret_manager.findTlsCertificate(name);
-    if (!secret) {
-      throw EnvoyException(fmt::format("Static secret is not defined: {}", name));
+    const auto& tls_certificate = config.tls_certificates(0);
+    if (!tls_certificate.has_certificate_chain() && !tls_certificate.has_private_key()) {
+      return nullptr;
     }
-    return read_secret(*secret);
-  } else {
-    return EMPTY_STRING;
+    return secret_manager.createInlineTlsCertificateProvider(config.tls_certificates(0));
   }
+  if (!config.tls_certificate_sds_secret_configs().empty()) {
+    const auto& sds_secret_config = config.tls_certificate_sds_secret_configs(0);
+
+    auto secret_provider =
+        secret_manager.findStaticTlsCertificateProvider(sds_secret_config.name());
+    if (!secret_provider) {
+      throw EnvoyException(
+          fmt::format("Static secret is not defined: {}", sds_secret_config.name()));
+    }
+    return secret_provider;
+  }
+  return nullptr;
 }
 
 } // namespace
@@ -62,35 +67,13 @@ ContextConfigImpl::ContextConfigImpl(const envoy::api::v2::auth::CommonTlsContex
       ecdh_curves_(StringUtil::nonEmptyStringOrDefault(
           RepeatedPtrUtil::join(config.tls_params().ecdh_curves(), ":"), DEFAULT_ECDH_CURVES)),
       ca_cert_(Config::DataSource::read(config.validation_context().trusted_ca(), true)),
-      ca_cert_path_(Config::DataSource::getPath(config.validation_context().trusted_ca())),
+      ca_cert_path_(Config::DataSource::getPath(config.validation_context().trusted_ca())
+                        .value_or(EMPTY_STRING)),
       certificate_revocation_list_(
           Config::DataSource::read(config.validation_context().crl(), true)),
       certificate_revocation_list_path_(
-          Config::DataSource::getPath(config.validation_context().crl())),
-      cert_chain_(readConfig(
-          config, secret_manager,
-          [](const envoy::api::v2::auth::TlsCertificate& tls_certificate) -> std::string {
-            return Config::DataSource::read(tls_certificate.certificate_chain(), true);
-          },
-          [](const Ssl::TlsCertificateConfig& secret) -> std::string {
-            return secret.certificateChain();
-          })),
-      cert_chain_path_(
-          config.tls_certificates().empty()
-              ? ""
-              : Config::DataSource::getPath(config.tls_certificates()[0].certificate_chain())),
-      private_key_(readConfig(
-          config, secret_manager,
-          [](const envoy::api::v2::auth::TlsCertificate& tls_certificate) -> std::string {
-            return Config::DataSource::read(tls_certificate.private_key(), true);
-          },
-          [](const Ssl::TlsCertificateConfig& secret) -> std::string {
-            return secret.privateKey();
-          })),
-      private_key_path_(
-          config.tls_certificates().empty()
-              ? ""
-              : Config::DataSource::getPath(config.tls_certificates()[0].private_key())),
+          Config::DataSource::getPath(config.validation_context().crl()).value_or(EMPTY_STRING)),
+      tls_certficate_provider_(getTlsCertificateConfigProvider(config, secret_manager)),
       verify_subject_alt_name_list_(config.validation_context().verify_subject_alt_name().begin(),
                                     config.validation_context().verify_subject_alt_name().end()),
       verify_certificate_hash_list_(config.validation_context().verify_certificate_hash().begin(),