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//
//
// 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/credentials/xds/xds_credentials.h"
#include "src/core/ext/xds/xds_certificate_provider.h"
#include "src/core/lib/security/credentials/tls/grpc_tls_credentials_options.h"
#include "src/core/lib/security/credentials/tls/tls_credentials.h"
#include "src/core/lib/security/credentials/tls/tls_utils.h"
#include "src/core/lib/uri/uri_parser.h"
namespace grpc_core {
const char kCredentialsTypeXds[] = "Xds";
namespace {
bool XdsVerifySubjectAlternativeNames(
const char* const* subject_alternative_names,
size_t subject_alternative_names_size,
const std::vector<XdsApi::StringMatcher>& matchers) {
if (matchers.empty()) return true;
for (size_t i = 0; i < subject_alternative_names_size; ++i) {
for (const auto& matcher : matchers) {
if (matcher.type() == XdsApi::StringMatcher::StringMatcherType::EXACT) {
// For EXACT match, use DNS rules for verifying SANs
// TODO(zhenlian): Right now, the SSL layer does not save the type of
// the SAN, so we are doing a DNS style verification for all SANs when
// the type is EXACT. When we expose the SAN type, change this to only
// do this verification when the SAN type is DNS and match type is
// EXACT. For all other cases, we should use matcher.Match().
if (VerifySubjectAlternativeName(subject_alternative_names[i],
matcher.string_matcher())) {
return true;
}
} else {
if (matcher.Match(subject_alternative_names[i])) {
return true;
}
}
}
}
return false;
}
int ServerAuthCheckSchedule(void* config_user_data,
grpc_tls_server_authorization_check_arg* arg) {
XdsCertificateProvider* xds_certificate_provider =
static_cast<XdsCertificateProvider*>(config_user_data);
if (XdsVerifySubjectAlternativeNames(
arg->subject_alternative_names, arg->subject_alternative_names_size,
xds_certificate_provider->subject_alternative_name_matchers())) {
arg->success = 1;
arg->status = GRPC_STATUS_OK;
} else {
arg->success = 0;
arg->status = GRPC_STATUS_UNAUTHENTICATED;
if (arg->error_details) {
arg->error_details->set_error_details(
"SANs from certificate did not match SANs from xDS control plane");
}
}
return 0; /* synchronous check */
}
void ServerAuthCheckDestroy(void* config_user_data) {
XdsCertificateProvider* xds_certificate_provider =
static_cast<XdsCertificateProvider*>(config_user_data);
xds_certificate_provider->Unref();
}
} // namespace
bool TestOnlyXdsVerifySubjectAlternativeNames(
const char* const* subject_alternative_names,
size_t subject_alternative_names_size,
const std::vector<XdsApi::StringMatcher>& matchers) {
return XdsVerifySubjectAlternativeNames(
subject_alternative_names, subject_alternative_names_size, matchers);
}
//
// XdsCredentials
//
RefCountedPtr<grpc_channel_security_connector>
XdsCredentials::create_security_connector(
RefCountedPtr<grpc_call_credentials> call_creds, const char* target_name,
const grpc_channel_args* args, grpc_channel_args** new_args) {
auto xds_certificate_provider =
XdsCertificateProvider::GetFromChannelArgs(args);
// TODO(yashykt): This arg will no longer need to be added after b/173119596
// is fixed.
grpc_arg override_arg = grpc_channel_arg_string_create(
const_cast<char*>(GRPC_SSL_TARGET_NAME_OVERRIDE_ARG),
const_cast<char*>(target_name));
const char* override_arg_name = GRPC_SSL_TARGET_NAME_OVERRIDE_ARG;
const grpc_channel_args* temp_args = args;
if (grpc_channel_args_find(args, override_arg_name) == nullptr) {
temp_args = grpc_channel_args_copy_and_add_and_remove(
args, &override_arg_name, 1, &override_arg, 1);
}
RefCountedPtr<grpc_channel_security_connector> security_connector;
if (xds_certificate_provider != nullptr) {
auto tls_credentials_options =
MakeRefCounted<grpc_tls_credentials_options>();
tls_credentials_options->set_certificate_provider(xds_certificate_provider);
if (xds_certificate_provider->ProvidesRootCerts()) {
tls_credentials_options->set_watch_root_cert(true);
}
if (xds_certificate_provider->ProvidesIdentityCerts()) {
tls_credentials_options->set_watch_identity_pair(true);
}
tls_credentials_options->set_server_verification_option(
GRPC_TLS_SKIP_HOSTNAME_VERIFICATION);
tls_credentials_options->set_server_authorization_check_config(
MakeRefCounted<grpc_tls_server_authorization_check_config>(
xds_certificate_provider->Ref().release(), ServerAuthCheckSchedule,
nullptr, ServerAuthCheckDestroy));
auto tls_credentials =
MakeRefCounted<TlsCredentials>(std::move(tls_credentials_options));
security_connector = tls_credentials->create_security_connector(
std::move(call_creds), target_name, temp_args, new_args);
} else {
GPR_ASSERT(fallback_credentials_ != nullptr);
security_connector = fallback_credentials_->create_security_connector(
std::move(call_creds), target_name, temp_args, new_args);
}
if (temp_args != args) {
grpc_channel_args_destroy(temp_args);
}
return security_connector;
}
//
// XdsServerCredentials
//
RefCountedPtr<grpc_server_security_connector>
XdsServerCredentials::create_security_connector() {
// TODO(yashkt): Fill this
return fallback_credentials_->create_security_connector();
}
} // namespace grpc_core
grpc_channel_credentials* grpc_xds_credentials_create(
grpc_channel_credentials* fallback_credentials) {
GPR_ASSERT(fallback_credentials != nullptr);
return new grpc_core::XdsCredentials(fallback_credentials->Ref());
}
grpc_server_credentials* grpc_xds_server_credentials_create(
grpc_server_credentials* fallback_credentials) {
GPR_ASSERT(fallback_credentials != nullptr);
return new grpc_core::XdsServerCredentials(fallback_credentials->Ref());
}
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