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/*
* Copyright 2020 The casbin Authors. All Rights Reserved.
*
* 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 "casbin/pch.h"
#ifndef ENFORCER_CPP
#define ENFORCER_CPP
#include <algorithm>
#include <regex>
#include "casbin/effect/default_effector.h"
#include "casbin/enforcer.h"
#include "casbin/selected_policies.h"
#include "casbin/exception/casbin_adapter_exception.h"
#include "casbin/exception/casbin_enforcer_exception.h"
#include "casbin/persist/file_adapter/batch_file_adapter.h"
#include "casbin/persist/file_adapter/file_adapter.h"
#include "casbin/persist/watcher_ex.h"
#include "casbin/model/policy_collection.hpp"
#include "casbin/rbac/default_role_manager.h"
#include "casbin/util/util.h"
namespace casbin {
// enforce use a custom matcher to decides whether a "subject" can access a "object"
// with the operation "action", input parameters are usually: (matcher, sub, obj, act),
// use model matcher by default when matcher is "".
bool Enforcer::m_enforce(const std::string& matcher, std::vector<std::string>& explains, std::shared_ptr<IEvaluator> evalator) {
if (!explains.empty()) {
explains.clear();
}
// when Casbin is disabled, all access will be allowed by the m_enforce()
if (!m_enabled) {
return true;
}
evalator->func_list.clear();
evalator->LoadFunctions();
// std::unordered_map<std::string, std::shared_ptr<RoleManager>> rm_map;
if (m_model->m.find("g") != m_model->m.end()) {
for (auto [assertion_name, assertion] : m_model->m["g"].assertion_map) {
std::shared_ptr<RoleManager>& rm = assertion->rm;
int char_count = static_cast<int>(std::count(assertion->value.begin(), assertion->value.end(), '_'));
evalator->LoadGFunction(rm, assertion_name, char_count);
}
}
std::string exp_string;
if (matcher.empty()) {
exp_string = m_model->m["m"].assertion_map["m"]->value;
} else {
exp_string = matcher;
}
std::unordered_map<std::string, int> r_int_tokens;
const std::vector<std::string>& r_tokens = m_model->m["r"].assertion_map["r"]->tokens;
r_int_tokens.reserve(r_tokens.size());
for (int i = 0; i < r_tokens.size(); i++) {
r_int_tokens[r_tokens[i]] = i;
}
std::unordered_map<std::string, int> p_int_tokens;
const std::vector<std::string>& p_tokens = m_model->m["p"].assertion_map["p"]->tokens;
p_int_tokens.reserve(p_tokens.size());
for (int i = 0; i < p_tokens.size(); i++) {
p_int_tokens[p_tokens[i]] = i;
}
bool hasEval = HasEval(exp_string);
std::vector<Effect> policy_effects;
std::vector<float> matcher_results;
Effect effect;
int explainIndex;
SelectedPolicies selected_policies(evalator, matcher, m_model);
PoliciesValues& p_policy = *selected_policies;
if (auto policy_len = p_policy.size(); policy_len != 0) {
policy_effects = std::vector<Effect>(policy_len, Effect::Indeterminate);
matcher_results = std::vector<float>(policy_len, 0.0f);
int policy_index = 0;
for (auto& p_vals : p_policy ) {
casbin::LogUtil::LogPrint("Policy Rule: ", p_vals);
if (p_tokens.size() != p_vals.size()) {
throw CasbinEnforcerException("invalid policy size");
// m_log.LogPrintf("invalid policy size: expected ", p_tokens.size(), ", got ",p_vals.size());
// return false;
}
evalator->Clean(m_model->m["p"], false);
evalator->InitialObject("p");
for (int j = 0; j < p_tokens.size(); j++) {
size_t index = p_tokens[j].find('_');
std::string token = p_tokens[j].substr(index + 1);
evalator->PushObjectString("p", token, p_vals[j]);
}
if (hasEval) {
auto ruleNames = GetEvalValue(exp_string);
std::unordered_map<std::string, std::string> replacements;
for (auto& ruleName : ruleNames) {
auto ruleNameCpy = EscapeAssertion(ruleName);
bool ok = p_int_tokens.find(ruleNameCpy) != p_int_tokens.end();
if (ok) {
int idx = p_int_tokens[ruleNameCpy];
replacements[ruleName] = p_vals[idx];
} else {
throw CasbinEnforcerException("please make sure rule exists in policy when using eval() in matcher");
// return false;
}
}
auto expWithRule = ReplaceEvalWithMap(exp_string, replacements);
evalator->Eval(expWithRule);
} else {
evalator->Eval(exp_string);
}
// set to no-match at first
matcher_results[policy_index] = 0;
if (evalator->CheckType() == Type::Bool) {
bool result = evalator->GetBoolean();
if (result) {
matcher_results[policy_index] = 1;
}
} else if (evalator->CheckType() == Type::Float) {
float result = evalator->GetFloat();
if (result != 0.0) {
matcher_results[policy_index] = 1;
}
} else {
throw CasbinEnforcerException("matcher result should be bool, int or float");
// return false;
}
if (int is_p_eft = p_int_tokens.find("p_eft") != p_int_tokens.end(); is_p_eft) {
int j = p_int_tokens["p_eft"];
const std::string& eft = p_vals[j];
if (eft == "allow") {
policy_effects[policy_index] = Effect::Allow;
} else if (eft == "deny") {
policy_effects[policy_index] = Effect::Deny;
} else {
policy_effects[policy_index] = Effect::Indeterminate;
}
} else {
policy_effects[policy_index] = Effect::Allow;
}
effect = m_eft->MergeEffects(m_model->m["e"].assertion_map["e"]->value, policy_effects,
matcher_results, policy_index, policy_len, explainIndex);
if (effect != Effect::Indeterminate) {
break;
}
policy_index++;
}
casbin::LogUtil::LogPrint("Rule Results: ", policy_effects);
} else {
if (hasEval && p_policy.empty()) {
throw CasbinEnforcerException("please make sure rule exists in policy when using eval() in matcher");
// return false;
}
policy_effects = std::vector<Effect>(1, Effect::Indeterminate);
matcher_results = std::vector<float>(1, 1);
// Push initial value for p in symbol table
// If p don't in symbol table, the evaluate result will be invalid.
evalator->Clean(m_model->m["p"], false);
evalator->InitialObject("p");
for (const auto& p_token : p_tokens) {
size_t index = p_token.find("_");
std::string token = p_token.substr(index + 1);
evalator->PushObjectString("p", token, "");
}
bool isvalid = evalator->Eval(exp_string);
if (!isvalid) {
return false;
}
bool result = evalator->GetBoolean();
if (result) {
policy_effects[0] = Effect::Allow;
} else {
policy_effects[0] = Effect::Indeterminate;
}
effect = m_eft->MergeEffects(m_model->m["e"].assertion_map["e"]->value, policy_effects,
matcher_results, 0, 1, explainIndex);
casbin::LogUtil::LogPrint("Rule Results: ", policy_effects);
}
PoliciesValues logExplains;
logExplains.emplace(explains);
if (explainIndex != -1 && (p_policy.size() > explainIndex)) {
explains = *std::next(p_policy.begin(), explainIndex);
logExplains.emplace(explains);
}
// effect --> result
bool result = false;
if (effect == Effect::Allow) {
result = true;
}
return result;
}
/**
* Enforcer is the default constructor.
*/
Enforcer ::Enforcer() {
}
/**
* Enforcer initializes an enforcer with a model file and a policy file.
*
* @param model_path the path of the model file.
* @param policyFile the path of the policy file.
*/
Enforcer ::Enforcer(const std::string& model_path, const std::string& policy_file)
: Enforcer(model_path, std::make_shared<BatchFileAdapter>(policy_file)) {
}
/**
* Enforcer initializes an enforcer with a database adapter.
*
* @param model_path the path of the model file.
* @param adapter the adapter.
*/
Enforcer ::Enforcer(const std::string& model_path, std::shared_ptr<Adapter> adapter)
: Enforcer(std::make_shared<Model>(model_path), adapter) {
m_model_path = model_path;
}
/**
* Enforcer initializes an enforcer with a model and a database adapter.
*
* @param m the model.
* @param adapter the adapter.
*/
Enforcer::Enforcer(const std::shared_ptr<Model>& m, std::shared_ptr<Adapter> adapter)
: m_adapter(adapter), m_watcher(nullptr), m_model(m) {
m_model->PrintModel();
this->Initialize();
if (m_adapter && m_adapter->IsValid())
this->LoadPolicy();
}
/**
* Enforcer initializes an enforcer with a model.
*
* @param m the model.
*/
Enforcer::Enforcer(const std::shared_ptr<Model>& m)
: Enforcer(m, NULL) {
}
/**
* Enforcer initializes an enforcer with a model file.
*
* @param model_path the path of the model file.
*/
Enforcer ::Enforcer(const std::string& model_path)
: Enforcer(model_path, "") {
}
/**
* Enforcer initializes an enforcer with a model file, a policy file and an enable log flag.
*
* @param model_path the path of the model file.
* @param policyFile the path of the policy file.
* @param enableLog whether to enable Casbin's log.
*/
Enforcer::Enforcer(const std::string& model_path, const std::string& policy_file, bool enable_log)
: Enforcer(model_path, std::make_shared<BatchFileAdapter>(policy_file)) {
this->EnableLog(enable_log);
}
// InitWithFile initializes an enforcer with a model file and a policy file.
void Enforcer::InitWithFile(const std::string& model_path, const std::string& policy_path) {
std::shared_ptr<Adapter> a = std::make_shared<BatchFileAdapter>(policy_path);
this->InitWithAdapter(model_path, a);
}
// InitWithAdapter initializes an enforcer with a database adapter.
void Enforcer::InitWithAdapter(const std::string& model_path, std::shared_ptr<Adapter> adapter) {
std::shared_ptr<Model> m = Model::NewModelFromFile(model_path);
this->InitWithModelAndAdapter(m, adapter);
m_model_path = model_path;
}
// InitWithModelAndAdapter initializes an enforcer with a model and a database adapter.
void Enforcer::InitWithModelAndAdapter(const std::shared_ptr<Model>& m, std::shared_ptr<Adapter> adapter) {
m_adapter = adapter;
m_model = m;
m_model->PrintModel();
this->Initialize();
// Do not initialize the full policy when using a filtered adapter
if (m_adapter != NULL && !m_adapter->IsFiltered())
this->LoadPolicy();
}
void Enforcer::Initialize() {
this->rm = std::make_shared<DefaultRoleManager>(10);
m_eft = std::make_shared<DefaultEffector>();
m_watcher = nullptr;
m_evalator = nullptr;
m_enabled = true;
m_auto_save = true;
m_auto_build_role_links = true;
m_auto_notify_watcher = true;
}
/**
* Destructor of Enforcer
*
* @step: Release the memory of Enforcer->m_scope
*/
Enforcer::~Enforcer() {}
// LoadModel reloads the model from the model CONF file.
// Because the policy is attached to a model, so the policy is invalidated and needs
// to be reloaded by calling LoadPolicy().
void Enforcer::LoadModel() {
m_model = Model::NewModelFromFile(m_model_path);
m_model->PrintModel();
this->Initialize();
}
// GetModel gets the current model.
std::shared_ptr<Model> Enforcer::GetModel() {
return m_model;
}
// SetModel sets the current model.
void Enforcer::SetModel(const std::shared_ptr<Model>& m) {
m_model = m;
this->Initialize();
}
// GetAdapter gets the current adapter.
std::shared_ptr<Adapter> Enforcer::GetAdapter() {
return m_adapter;
}
// SetAdapter sets the current adapter.
void Enforcer::SetAdapter(std::shared_ptr<Adapter> adapter) {
m_adapter = adapter;
}
// SetWatcher sets the current watcher.
void Enforcer::SetWatcher(std::shared_ptr<Watcher> watcher) {
m_watcher = watcher;
auto func = [&, this](std::string str) {
this->LoadPolicy();
};
watcher->SetUpdateCallback(func);
}
// SetWatcher sets the current evaluator.
void Enforcer::SetEvaluator(std::shared_ptr<IEvaluator> evaluator) {
this->m_evalator = evaluator;
}
// GetRoleManager gets the current role manager.
std::shared_ptr<RoleManager> Enforcer ::GetRoleManager() {
return this->rm;
}
// SetRoleManager sets the current role manager.
void Enforcer::SetRoleManager(std::shared_ptr<RoleManager>& rm) {
this->rm = rm;
}
// SetEffector sets the current effector.
void Enforcer::SetEffector(std::shared_ptr<Effector> eft) {
m_eft = eft;
}
// ClearPolicy clears all policy.
void Enforcer::ClearPolicy() {
m_model->ClearPolicy();
}
// LoadPolicy reloads the policy from file/database.
void Enforcer::LoadPolicy() {
// must use base's LoadPolicy to avoid dead lock
Enforcer::ClearPolicy();
m_adapter->LoadPolicy(m_model);
m_model->PrintPolicy();
if (m_auto_build_role_links) {
Enforcer::BuildRoleLinks();
}
}
// LoadFilteredPolicy reloads a filtered policy from file/database.
template <typename Filter>
void Enforcer::LoadFilteredPolicy(Filter filter) {
this->ClearPolicy();
std::shared_ptr<FilteredAdapter> filtered_adapter;
if (m_adapter->IsFiltered())
filtered_adapter = std::dynamic_pointer_cast<FilteredAdapter>(m_adapter);
else
throw CasbinAdapterException("filtered policies are not supported by this adapter");
filtered_adapter->LoadFilteredPolicy(m_model, filter);
m_model->PrintPolicy();
if (m_auto_build_role_links)
this->BuildRoleLinks();
}
// IsFiltered returns true if the loaded policy has been filtered.
bool Enforcer::IsFiltered() {
return m_adapter->IsFiltered();
}
// SavePolicy saves the current policy (usually after changed with Casbin API) back to file/database.
void Enforcer::SavePolicy() {
if (this->IsFiltered())
throw CasbinEnforcerException("cannot save a filtered policy");
m_adapter->SavePolicy(m_model);
if (m_watcher != NULL) {
if (IsInstanceOf<WatcherEx>(m_watcher.get())) {
auto watcher = dynamic_cast<WatcherEx*>(m_watcher.get());
watcher->UpdateForSavePolicy(m_model);
} else
return m_watcher->Update();
}
}
// EnableEnforce changes the enforcing state of Casbin, when Casbin is disabled,
// all access will be allowed by the Enforce() function.
void Enforcer::EnableEnforce(bool enable) {
m_enabled = enable;
}
// EnableLog changes whether Casbin will log messages to the Logger.
void Enforcer::EnableLog(bool enable) {
m_log.GetLogger().EnableLog(enable);
}
// EnableAutoNotifyWatcher controls whether to save a policy rule automatically notify the Watcher when it is added or removed.
void Enforcer::EnableAutoNotifyWatcher(bool enable) {
m_auto_notify_watcher = enable;
}
// EnableAutoSave controls whether to save a policy rule automatically to the adapter when it is added or removed.
void Enforcer::EnableAutoSave(bool auto_save) {
m_auto_save = auto_save;
}
// EnableAutoBuildRoleLinks controls whether to rebuild the role inheritance relations when a role is added or deleted.
void Enforcer::EnableAutoBuildRoleLinks(bool auto_build_role_links) {
m_auto_build_role_links = auto_build_role_links;
}
// BuildRoleLinks manually rebuild the role inheritance relations.
void Enforcer::BuildRoleLinks() {
this->rm->Clear();
m_model->BuildRoleLinks(this->rm);
}
// BuildIncrementalRoleLinks provides incremental build the role inheritance relations.
void Enforcer::BuildIncrementalRoleLinks(policy_op op, const std::string& p_type, const PoliciesValues& rules) {
return m_model->BuildIncrementalRoleLinks(this->rm, op, "g", p_type, rules);
}
// Enforce decides whether a "subject" can access a "object" with the operation "action",
// input parameters are usually: (sub, obj, act).
bool Enforcer::Enforce(std::shared_ptr<IEvaluator> evalator) {
return this->EnforceWithMatcher("", evalator);
}
// Enforce with a vector param,decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (sub, obj, act).
bool Enforcer::Enforce(const DataList& params) {
return this->EnforceWithMatcher("", params);
}
bool Enforcer::Enforce(const DataVector& params) {
return this->EnforceWithMatcher("", params);
}
// Enforce with a map param,decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (sub, obj, act).
bool Enforcer::Enforce(const DataMap& params) {
return this->EnforceWithMatcher("", params);
}
// EnforceWithMatcher use a custom matcher to decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (matcher, sub, obj, act), use model matcher by default when matcher is "".
bool Enforcer::EnforceWithMatcher(const std::string& matcher, std::shared_ptr<IEvaluator> evalator) {
std::vector<std::string> explain;
bool result = EnforceExWithMatcher(matcher, evalator, explain);
return result;
}
// EnforceWithMatcher use a custom matcher to decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (matcher, sub, obj, act), use model matcher by default when matcher is "".
bool Enforcer::EnforceWithMatcher(const std::string& matcher, const DataList& params) {
std::vector<std::string> explain;
bool result = EnforceExWithMatcher(matcher, params, explain);
return result;
}
// EnforceWithMatcher use a custom matcher to decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (matcher, sub, obj, act), use model matcher by default when matcher is "".
bool Enforcer::EnforceWithMatcher(const std::string& matcher, const DataVector& params) {
std::vector<std::string> explain;
bool result = EnforceExWithMatcher(matcher, params, explain);
return result;
}
// EnforceWithMatcher use a custom matcher to decides whether a "subject" can access a "object"
// with the operation "action", input parameters are usually: (matcher, sub, obj, act),
// use model matcher by default when matcher is "".
bool Enforcer::EnforceWithMatcher(const std::string& matcher, const DataMap& params) {
std::vector<std::string> explain;
bool result = EnforceExWithMatcher(matcher, params, explain);
return result;
}
bool Enforcer::EnforceEx(std::shared_ptr<IEvaluator> evalator, std::vector<std::string>& explain) {
return this->EnforceExWithMatcher("", evalator, explain);
}
bool Enforcer::EnforceEx(const DataList& params, std::vector<std::string>& explain) {
return this->EnforceExWithMatcher("", params, explain);
}
bool Enforcer::EnforceEx(const DataVector& params, std::vector<std::string>& explain) {
return this->EnforceExWithMatcher("", params, explain);
}
bool Enforcer::EnforceEx(const DataMap& params, std::vector<std::string>& explain) {
return this->EnforceExWithMatcher("", params, explain);
}
bool Enforcer::EnforceExWithMatcher(const std::string& matcher, std::shared_ptr<IEvaluator> evalator, std::vector<std::string>& explain) {
return m_enforce(matcher, explain, evalator);
}
bool Enforcer::EnforceExWithMatcher(const std::string& matcher, const DataList& params, std::vector<std::string>& explain) {
const std::vector<std::string>& r_tokens = m_model->m["r"].assertion_map["r"]->tokens;
size_t r_cnt = r_tokens.size();
size_t cnt = params.size();
if (cnt != r_cnt)
return false;
if (this->m_evalator == nullptr) {
this->m_evalator = std::make_shared<ExprtkEvaluator>();
}
this->m_evalator->InitialObject("r");
size_t i = 0;
for (const Data& param : params) {
if (const auto string_param = std::get_if<std::string>(¶m)) {
this->m_evalator->PushObjectString("r", r_tokens[i].substr(2, r_tokens[i].size() - 2), *string_param);
} else if (const auto json_param = std::get_if<std::shared_ptr<nlohmann::json>>(¶m)) {
auto data_ptr = *json_param;
std::string token_name = r_tokens[i].substr(2, r_tokens[i].size() - 2);
this->m_evalator->PushObjectJson("r", token_name, *data_ptr);
}
++i;
}
bool result = m_enforce(matcher, explain, m_evalator);
return result;
}
bool Enforcer::EnforceExWithMatcher(const std::string& matcher, const DataVector& params, std::vector<std::string>& explain) {
const std::vector<std::string>& r_tokens = m_model->m["r"].assertion_map["r"]->tokens;
size_t r_cnt = r_tokens.size();
size_t cnt = params.size();
if (cnt != r_cnt)
return false;
if (this->m_evalator == nullptr) {
this->m_evalator = std::make_shared<ExprtkEvaluator>();
}
this->m_evalator->InitialObject("r");
size_t i = 0;
for (const auto& param : params) {
if (const auto string_param = std::get_if<std::string>(¶m)) {
this->m_evalator->PushObjectString("r", r_tokens[i].substr(2, r_tokens[i].size() - 2), *string_param);
} else if (const auto json_param = std::get_if<std::shared_ptr<nlohmann::json>>(¶m)) {
auto data_ptr = *json_param;
std::string token_name = r_tokens[i].substr(2, r_tokens[i].size() - 2);
this->m_evalator->PushObjectJson("r", token_name, *data_ptr);
}
++i;
}
bool result = m_enforce(matcher, explain, m_evalator);
return result;
}
bool Enforcer::EnforceExWithMatcher(const std::string& matcher, const DataMap& params, std::vector<std::string>& explain) {
if (this->m_evalator == nullptr) {
this->m_evalator = std::make_shared<ExprtkEvaluator>();
}
this->m_evalator->InitialObject("r");
for (auto [param_name, param_data] : params) {
if (const auto string_param = std::get_if<std::string>(¶m_data)) {
this->m_evalator->PushObjectString("r", param_name, *string_param);
} else if (const auto json_param = std::get_if<std::shared_ptr<nlohmann::json>>(¶m_data)) {
auto data_ptr = *json_param;
this->m_evalator->PushObjectJson("r", param_name, *data_ptr);
}
}
bool result = m_enforce(matcher, explain, m_evalator);
return result;
}
// BatchEnforce enforce in batches
std::vector<bool> Enforcer::BatchEnforce(const std::initializer_list<DataList>& requests) {
// Initializing an array for storing results with false
std::vector<bool> results;
results.reserve(requests.size());
for (const auto& request : requests) {
results.push_back(this->Enforce(request));
}
return results;
}
// BatchEnforceWithMatcher enforce with matcher in batches
std::vector<bool> Enforcer::BatchEnforceWithMatcher(const std::string& matcher, const std::initializer_list<DataList>& requests) {
std::vector<bool> results;
results.reserve(requests.size());
for (const auto& request : requests) {
results.push_back(this->EnforceWithMatcher(matcher, request));
}
return results;
}
} // namespace casbin
#endif // ENFORCER_CPP