Merge pull request grpc#23665 from dhc3800/evalargs_util

CEL evaluation argument utilility

Author: ashithasantosh

BUILD

@@ -1855,9 +1855,11 @@ grpc_cc_library(
     name = "grpc_authorization_engine",
     srcs = [
         "src/core/lib/security/authorization/authorization_engine.cc",
+        "src/core/lib/security/authorization/evaluate_args.cc",
     ],
     hdrs = [
         "src/core/lib/security/authorization/authorization_engine.h",
+        "src/core/lib/security/authorization/evaluate_args.h",
         "src/core/lib/security/authorization/mock_cel/activation.h",
         "src/core/lib/security/authorization/mock_cel/cel_value.h",
     ],
@@ -1866,6 +1868,7 @@ grpc_cc_library(
         "envoy_ads_upb",
         "google_api_upb",
         "grpc_base",
+        "grpc_secure",
     ],
 )
 

CMakeLists.txt

@@ -8411,6 +8411,7 @@ if(gRPC_BUILD_TESTS)
 
 add_executable(authorization_engine_test
   src/core/lib/security/authorization/authorization_engine.cc
+  src/core/lib/security/authorization/evaluate_args.cc
   test/core/security/authorization_engine_test.cc
   third_party/googletest/googletest/src/gtest-all.cc
   third_party/googletest/googlemock/src/gmock-all.cc

Makefile

@@ -11652,6 +11652,7 @@ endif
 
 AUTHORIZATION_ENGINE_TEST_SRC = \
     src/core/lib/security/authorization/authorization_engine.cc \
+    src/core/lib/security/authorization/evaluate_args.cc \
     test/core/security/authorization_engine_test.cc \
 
 AUTHORIZATION_ENGINE_TEST_OBJS = $(addprefix $(OBJDIR)/$(CONFIG)/, $(addsuffix .o, $(basename $(AUTHORIZATION_ENGINE_TEST_SRC))))
@@ -11685,6 +11686,8 @@ endif
 
 $(OBJDIR)/$(CONFIG)/src/core/lib/security/authorization/authorization_engine.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a
 
+$(OBJDIR)/$(CONFIG)/src/core/lib/security/authorization/evaluate_args.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a
+
 $(OBJDIR)/$(CONFIG)/test/core/security/authorization_engine_test.o:  $(LIBDIR)/$(CONFIG)/libgrpc_test_util.a $(LIBDIR)/$(CONFIG)/libgrpc.a $(LIBDIR)/$(CONFIG)/libgpr.a $(LIBDIR)/$(CONFIG)/libaddress_sorting.a $(LIBDIR)/$(CONFIG)/libupb.a
 
 deps_authorization_engine_test: $(AUTHORIZATION_ENGINE_TEST_OBJS:.o=.dep)

build_autogenerated.yaml

@@ -4771,10 +4771,12 @@ targets:
   language: c++
   headers:
   - src/core/lib/security/authorization/authorization_engine.h
+  - src/core/lib/security/authorization/evaluate_args.h
   - src/core/lib/security/authorization/mock_cel/activation.h
   - src/core/lib/security/authorization/mock_cel/cel_value.h
   src:
   - src/core/lib/security/authorization/authorization_engine.cc
+  - src/core/lib/security/authorization/evaluate_args.cc
   - test/core/security/authorization_engine_test.cc
   deps:
   - grpc_test_util

src/core/lib/security/authorization/evaluate_args.cc

@@ -0,0 +1,110 @@
+//
+//
+// Copyright 2020 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/security/authorization/evaluate_args.h"
+
+#include "src/core/lib/slice/slice_utils.h"
+
+namespace grpc_core {
+
+absl::string_view EvaluateArgs::GetPath() const {
+  absl::string_view path;
+  if (metadata_ != nullptr && metadata_->idx.named.path != nullptr) {
+    grpc_linked_mdelem* elem = metadata_->idx.named.path;
+    const grpc_slice& val = GRPC_MDVALUE(elem->md);
+    path = StringViewFromSlice(val);
+  }
+  return path;
+}
+
+absl::string_view EvaluateArgs::GetHost() const {
+  absl::string_view host;
+  if (metadata_ != nullptr && metadata_->idx.named.host != nullptr) {
+    grpc_linked_mdelem* elem = metadata_->idx.named.host;
+    const grpc_slice& val = GRPC_MDVALUE(elem->md);
+    host = StringViewFromSlice(val);
+  }
+  return host;
+}
+
+absl::string_view EvaluateArgs::GetMethod() const {
+  absl::string_view method;
+  if (metadata_ != nullptr && metadata_->idx.named.method != nullptr) {
+    grpc_linked_mdelem* elem = metadata_->idx.named.method;
+    const grpc_slice& val = GRPC_MDVALUE(elem->md);
+    method = StringViewFromSlice(val);
+  }
+  return method;
+}
+
+std::multimap<absl::string_view, absl::string_view> EvaluateArgs::GetHeaders()
+    const {
+  std::multimap<absl::string_view, absl::string_view> headers;
+  if (metadata_ == nullptr) {
+    return headers;
+  }
+  for (grpc_linked_mdelem* elem = metadata_->list.head; elem != nullptr;
+       elem = elem->next) {
+    const grpc_slice& key = GRPC_MDKEY(elem->md);
+    const grpc_slice& val = GRPC_MDVALUE(elem->md);
+    headers.emplace(StringViewFromSlice(key), StringViewFromSlice(val));
+  }
+  return headers;
+}
+
+absl::string_view EvaluateArgs::GetSpiffeId() const {
+  absl::string_view spiffe_id;
+  if (auth_context_ == nullptr) {
+    return spiffe_id;
+  }
+  grpc_auth_property_iterator it = grpc_auth_context_find_properties_by_name(
+      auth_context_, GRPC_PEER_SPIFFE_ID_PROPERTY_NAME);
+  const grpc_auth_property* prop = grpc_auth_property_iterator_next(&it);
+  if (prop == nullptr) return spiffe_id;
+  if (strncmp(prop->value, GRPC_PEER_SPIFFE_ID_PROPERTY_NAME,
+              prop->value_length) != 0) {
+    return spiffe_id;
+  }
+  if (grpc_auth_property_iterator_next(&it) != nullptr) return spiffe_id;
+  spiffe_id = absl::string_view(
+      reinterpret_cast<const char*>(prop->value, prop->value_length));
+  return spiffe_id;
+}
+
+absl::string_view EvaluateArgs::GetCertServerName() const {
+  absl::string_view name;
+  if (auth_context_ == nullptr) {
+    return name;
+  }
+  grpc_auth_property_iterator it = grpc_auth_context_find_properties_by_name(
+      auth_context_, GRPC_X509_CN_PROPERTY_NAME);
+  const grpc_auth_property* prop = grpc_auth_property_iterator_next(&it);
+  if (prop == nullptr) return name;
+  if (strncmp(prop->value, GRPC_X509_CN_PROPERTY_NAME, prop->value_length) !=
+      0) {
+    return name;
+  }
+  if (grpc_auth_property_iterator_next(&it) != nullptr) return name;
+  name = absl::string_view(
+      reinterpret_cast<const char*>(prop->value, prop->value_length));
+  return name;
+}
+
+}  // namespace grpc_core

src/core/lib/security/authorization/evaluate_args.h

@@ -0,0 +1,54 @@
+//
+//
+// Copyright 2020 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+
+#ifndef GRPC_CORE_LIB_SECURITY_AUTHORIZATION_EVALUATE_ARGS_H
+#define GRPC_CORE_LIB_SECURITY_AUTHORIZATION_EVALUATE_ARGS_H
+
+#include <grpc/support/port_platform.h>
+
+#include <map>
+
+#include "src/core/lib/iomgr/endpoint.h"
+#include "src/core/lib/security/context/security_context.h"
+#include "src/core/lib/transport/metadata_batch.h"
+
+namespace grpc_core {
+
+class EvaluateArgs {
+ public:
+  EvaluateArgs(grpc_metadata_batch* metadata, grpc_auth_context* auth_context,
+               grpc_endpoint* endpoint);
+
+  absl::string_view GetPath() const;
+  absl::string_view GetHost() const;
+  absl::string_view GetMethod() const;
+  std::multimap<absl::string_view, absl::string_view> GetHeaders() const;
+  absl::string_view GetSpiffeId() const;
+  absl::string_view GetCertServerName() const;
+
+  // TODO: Add a getter function for source.principal
+
+ private:
+  grpc_metadata_batch* metadata_;
+  grpc_auth_context* auth_context_;
+  grpc_endpoint* endpoint_;
+};
+
+}  // namespace grpc_core
+
+#endif  // GRPC_CORE_LIB_SECURITY_AUTHORIZATION_EVALUATE_ARGS_H