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// Copyright 2021 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/matchers.h"
namespace grpc_core {
namespace {
bool AuthenticatedMatchesHelper(const EvaluateArgs& args,
const StringMatcher& matcher) {
if (args.GetTransportSecurityType() != GRPC_SSL_TRANSPORT_SECURITY_TYPE) {
// Connection is not authenticated.
return false;
}
if (matcher.string_matcher().empty()) {
// Allows any authenticated user.
return true;
}
absl::string_view spiffe_id = args.GetSpiffeId();
if (!spiffe_id.empty()) {
return matcher.Match(spiffe_id);
}
// TODO(ashithasantosh): Check principal matches DNS SAN, followed by Subject
// field from certificate. This requires updating tsi_peer to expose these
// fields.
return false;
}
} // namespace
std::unique_ptr<AuthorizationMatcher> AuthorizationMatcher::Create(
Rbac::Permission permission) {
switch (permission.type) {
case Rbac::Permission::RuleType::kAnd:
return absl::make_unique<AndAuthorizationMatcher>(
std::move(permission.permissions), permission.not_rule);
case Rbac::Permission::RuleType::kOr:
return absl::make_unique<OrAuthorizationMatcher>(
std::move(permission.permissions), permission.not_rule);
case Rbac::Permission::RuleType::kAny:
return absl::make_unique<AlwaysAuthorizationMatcher>(permission.not_rule);
case Rbac::Permission::RuleType::kHeader:
return absl::make_unique<HeaderAuthorizationMatcher>(
std::move(permission.header_matcher), permission.not_rule);
case Rbac::Permission::RuleType::kPath:
return absl::make_unique<PathAuthorizationMatcher>(
std::move(permission.string_matcher), permission.not_rule);
case Rbac::Permission::RuleType::kDestIp:
return absl::make_unique<IpAuthorizationMatcher>(std::move(permission.ip),
permission.not_rule);
case Rbac::Permission::RuleType::kDestPort:
return absl::make_unique<PortAuthorizationMatcher>(permission.port,
permission.not_rule);
case Rbac::Permission::RuleType::kReqServerName:
return absl::make_unique<ReqServerNameAuthorizationMatcher>(
std::move(permission.string_matcher), permission.not_rule);
}
return nullptr;
}
std::unique_ptr<AuthorizationMatcher> AuthorizationMatcher::Create(
Rbac::Principal principal) {
switch (principal.type) {
case Rbac::Principal::RuleType::kAnd:
return absl::make_unique<AndAuthorizationMatcher>(
std::move(principal.principals), principal.not_rule);
case Rbac::Principal::RuleType::kOr:
return absl::make_unique<OrAuthorizationMatcher>(
std::move(principal.principals), principal.not_rule);
case Rbac::Principal::RuleType::kAny:
return absl::make_unique<AlwaysAuthorizationMatcher>(principal.not_rule);
case Rbac::Principal::RuleType::kPrincipalName:
return absl::make_unique<AuthenticatedAuthorizationMatcher>(
std::move(principal.string_matcher), principal.not_rule);
case Rbac::Principal::RuleType::kSourceIp:
case Rbac::Principal::RuleType::kDirectRemoteIp:
case Rbac::Principal::RuleType::kRemoteIp:
return absl::make_unique<IpAuthorizationMatcher>(std::move(principal.ip),
principal.not_rule);
case Rbac::Principal::RuleType::kHeader:
return absl::make_unique<HeaderAuthorizationMatcher>(
std::move(principal.header_matcher), principal.not_rule);
case Rbac::Principal::RuleType::kPath:
return absl::make_unique<PathAuthorizationMatcher>(
std::move(principal.string_matcher), principal.not_rule);
}
return nullptr;
}
AndAuthorizationMatcher::AndAuthorizationMatcher(
std::vector<std::unique_ptr<Rbac::Permission>> rules, bool not_rule)
: not_rule_(not_rule) {
for (auto& rule : rules) {
matchers_.push_back(AuthorizationMatcher::Create(std::move(*rule)));
}
}
AndAuthorizationMatcher::AndAuthorizationMatcher(
std::vector<std::unique_ptr<Rbac::Principal>> ids, bool not_rule)
: not_rule_(not_rule) {
for (const auto& id : ids) {
matchers_.push_back(AuthorizationMatcher::Create(std::move(*id)));
}
}
bool AndAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
bool matches = true;
for (const auto& matcher : matchers_) {
if (!matcher->Matches(args)) {
matches = false;
break;
}
}
return matches != not_rule_;
}
OrAuthorizationMatcher::OrAuthorizationMatcher(
std::vector<std::unique_ptr<Rbac::Permission>> rules, bool not_rule)
: not_rule_(not_rule) {
for (const auto& rule : rules) {
matchers_.push_back(AuthorizationMatcher::Create(std::move(*rule)));
}
}
OrAuthorizationMatcher::OrAuthorizationMatcher(
std::vector<std::unique_ptr<Rbac::Principal>> ids, bool not_rule)
: not_rule_(not_rule) {
for (const auto& id : ids) {
matchers_.push_back(AuthorizationMatcher::Create(std::move(*id)));
}
}
bool OrAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
bool matches = false;
for (const auto& matcher : matchers_) {
if (matcher->Matches(args)) {
matches = true;
break;
}
}
return matches != not_rule_;
}
bool HeaderAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
std::string concatenated_value;
bool matches =
matcher_.Match(args.GetHeaderValue(matcher_.name(), &concatenated_value));
return matches != not_rule_;
}
// TODO(ashithasantosh): Implement IpAuthorizationMatcher::Matches.
bool IpAuthorizationMatcher::Matches(const EvaluateArgs&) const {
bool matches = false;
return matches != not_rule_;
}
bool PortAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
bool matches = (port_ == args.GetLocalPort());
return matches != not_rule_;
}
bool AuthenticatedAuthorizationMatcher::Matches(
const EvaluateArgs& args) const {
bool matches = AuthenticatedMatchesHelper(args, matcher_);
return matches != not_rule_;
}
bool ReqServerNameAuthorizationMatcher::Matches(const EvaluateArgs&) const {
// Currently we do not support matching rules containing
// "requested_server_name".
bool matches = false;
return matches != not_rule_;
}
bool PathAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
bool matches = false;
absl::string_view path = args.GetPath();
if (!path.empty()) {
matches = matcher_.Match(path);
}
return matches != not_rule_;
}
bool PolicyAuthorizationMatcher::Matches(const EvaluateArgs& args) const {
return permissions_->Matches(args) && principals_->Matches(args);
}
} // namespace grpc_core
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