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enforcer.go
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enforcer.go
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// Copyright 2017 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.
package casbin
import (
"errors"
"fmt"
"github.com/Knetic/govaluate"
"github.com/casbin/casbin/v2/effector"
"github.com/casbin/casbin/v2/log"
"github.com/casbin/casbin/v2/model"
"github.com/casbin/casbin/v2/persist"
fileadapter "github.com/casbin/casbin/v2/persist/file-adapter"
"github.com/casbin/casbin/v2/rbac"
defaultrolemanager "github.com/casbin/casbin/v2/rbac/default-role-manager"
"github.com/casbin/casbin/v2/util"
)
// Enforcer is the main interface for authorization enforcement and policy management.
type Enforcer struct {
modelPath string
model model.Model
fm model.FunctionMap
eft effector.Effector
adapter persist.Adapter
watcher persist.Watcher
dispatcher persist.Dispatcher
rmMap map[string]rbac.RoleManager
enabled bool
autoSave bool
autoBuildRoleLinks bool
autoNotifyWatcher bool
autoNotifyDispatcher bool
logger log.Logger
}
// EnforceContext is used as the first element of the parameter "rvals" in method "enforce"
type EnforceContext struct {
rType string
pType string
eType string
mType string
}
// NewEnforcer creates an enforcer via file or DB.
//
// File:
//
// e := casbin.NewEnforcer("path/to/basic_model.conf", "path/to/basic_policy.csv")
//
// MySQL DB:
//
// a := mysqladapter.NewDBAdapter("mysql", "mysql_username:mysql_password@tcp(127.0.0.1:3306)/")
// e := casbin.NewEnforcer("path/to/basic_model.conf", a)
//
func NewEnforcer(params ...interface{}) (*Enforcer, error) {
e := &Enforcer{logger: &log.DefaultLogger{}}
parsedParamLen := 0
paramLen := len(params)
if paramLen >= 1 {
enableLog, ok := params[paramLen-1].(bool)
if ok {
e.EnableLog(enableLog)
parsedParamLen++
}
}
if paramLen-parsedParamLen >= 1 {
logger, ok := params[paramLen-parsedParamLen-1].(log.Logger)
if ok {
e.logger = logger
parsedParamLen++
}
}
if paramLen-parsedParamLen == 2 {
switch p0 := params[0].(type) {
case string:
switch p1 := params[1].(type) {
case string:
err := e.InitWithFile(p0, p1)
if err != nil {
return nil, err
}
default:
err := e.InitWithAdapter(p0, p1.(persist.Adapter))
if err != nil {
return nil, err
}
}
default:
switch params[1].(type) {
case string:
return nil, errors.New("invalid parameters for enforcer")
default:
err := e.InitWithModelAndAdapter(p0.(model.Model), params[1].(persist.Adapter))
if err != nil {
return nil, err
}
}
}
} else if paramLen-parsedParamLen == 1 {
switch p0 := params[0].(type) {
case string:
err := e.InitWithFile(p0, "")
if err != nil {
return nil, err
}
default:
err := e.InitWithModelAndAdapter(p0.(model.Model), nil)
if err != nil {
return nil, err
}
}
} else if paramLen-parsedParamLen == 0 {
return e, nil
} else {
return nil, errors.New("invalid parameters for enforcer")
}
return e, nil
}
// InitWithFile initializes an enforcer with a model file and a policy file.
func (e *Enforcer) InitWithFile(modelPath string, policyPath string) error {
a := fileadapter.NewAdapter(policyPath)
return e.InitWithAdapter(modelPath, a)
}
// InitWithAdapter initializes an enforcer with a database adapter.
func (e *Enforcer) InitWithAdapter(modelPath string, adapter persist.Adapter) error {
m, err := model.NewModelFromFile(modelPath)
if err != nil {
return err
}
err = e.InitWithModelAndAdapter(m, adapter)
if err != nil {
return err
}
e.modelPath = modelPath
return nil
}
// InitWithModelAndAdapter initializes an enforcer with a model and a database adapter.
func (e *Enforcer) InitWithModelAndAdapter(m model.Model, adapter persist.Adapter) error {
e.adapter = adapter
e.model = m
m.SetLogger(e.logger)
e.model.PrintModel()
e.fm = model.LoadFunctionMap()
e.initialize()
// Do not initialize the full policy when using a filtered adapter
fa, ok := e.adapter.(persist.FilteredAdapter)
if e.adapter != nil && (!ok || ok && !fa.IsFiltered()) {
err := e.LoadPolicy()
if err != nil {
return err
}
}
return nil
}
// SetLogger changes the current enforcer's logger.
func (e *Enforcer) SetLogger(logger log.Logger) {
e.logger = logger
e.model.SetLogger(e.logger)
for k := range e.rmMap {
e.rmMap[k].SetLogger(e.logger)
}
}
func (e *Enforcer) initialize() {
e.rmMap = map[string]rbac.RoleManager{}
e.eft = effector.NewDefaultEffector()
e.watcher = nil
e.enabled = true
e.autoSave = true
e.autoBuildRoleLinks = true
e.autoNotifyWatcher = true
e.autoNotifyDispatcher = true
e.initRmMap()
}
// 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().
func (e *Enforcer) LoadModel() error {
var err error
e.model, err = model.NewModelFromFile(e.modelPath)
if err != nil {
return err
}
e.model.SetLogger(e.logger)
e.model.PrintModel()
e.fm = model.LoadFunctionMap()
e.initialize()
return nil
}
// GetModel gets the current model.
func (e *Enforcer) GetModel() model.Model {
return e.model
}
// SetModel sets the current model.
func (e *Enforcer) SetModel(m model.Model) {
e.model = m
e.fm = model.LoadFunctionMap()
e.model.SetLogger(e.logger)
e.initialize()
}
// GetAdapter gets the current adapter.
func (e *Enforcer) GetAdapter() persist.Adapter {
return e.adapter
}
// SetAdapter sets the current adapter.
func (e *Enforcer) SetAdapter(adapter persist.Adapter) {
e.adapter = adapter
}
// SetWatcher sets the current watcher.
func (e *Enforcer) SetWatcher(watcher persist.Watcher) error {
e.watcher = watcher
return watcher.SetUpdateCallback(func(string) { _ = e.LoadPolicy() })
}
// GetRoleManager gets the current role manager.
func (e *Enforcer) GetRoleManager() rbac.RoleManager {
return e.rmMap["g"]
}
// SetRoleManager sets the current role manager.
func (e *Enforcer) SetRoleManager(rm rbac.RoleManager) {
e.rmMap["g"] = rm
}
// SetEffector sets the current effector.
func (e *Enforcer) SetEffector(eft effector.Effector) {
e.eft = eft
}
// ClearPolicy clears all policy.
func (e *Enforcer) ClearPolicy() {
if e.dispatcher != nil && e.autoNotifyDispatcher {
_ = e.dispatcher.ClearPolicy()
return
}
e.model.ClearPolicy()
}
// LoadPolicy reloads the policy from file/database.
func (e *Enforcer) LoadPolicy() error {
needToRebuild := false
oldModel := e.model
e.model = oldModel.Copy()
e.ClearPolicy()
var err error
defer func() {
if err != nil {
e.model = oldModel
if e.autoBuildRoleLinks && needToRebuild {
_ = e.BuildRoleLinks()
}
}
}()
if err = e.adapter.LoadPolicy(e.model); err != nil && err.Error() != "invalid file path, file path cannot be empty" {
return err
}
if err = e.model.SortPoliciesBySubjectHierarchy(); err != nil {
return err
}
if err = e.model.SortPoliciesByPriority(); err != nil {
return err
}
if e.autoBuildRoleLinks {
needToRebuild = true
err = e.BuildRoleLinks()
if err != nil {
return err
}
}
return nil
}
func (e *Enforcer) loadFilteredPolicy(filter interface{}) error {
var filteredAdapter persist.FilteredAdapter
// Attempt to cast the Adapter as a FilteredAdapter
switch adapter := e.adapter.(type) {
case persist.FilteredAdapter:
filteredAdapter = adapter
default:
return errors.New("filtered policies are not supported by this adapter")
}
if err := filteredAdapter.LoadFilteredPolicy(e.model, filter); err != nil && err.Error() != "invalid file path, file path cannot be empty" {
return err
}
if err := e.model.SortPoliciesByPriority(); err != nil {
return err
}
e.initRmMap()
e.model.PrintPolicy()
if e.autoBuildRoleLinks {
err := e.BuildRoleLinks()
if err != nil {
return err
}
}
return nil
}
// LoadFilteredPolicy reloads a filtered policy from file/database.
func (e *Enforcer) LoadFilteredPolicy(filter interface{}) error {
e.model.ClearPolicy()
return e.loadFilteredPolicy(filter)
}
// LoadIncrementalFilteredPolicy append a filtered policy from file/database.
func (e *Enforcer) LoadIncrementalFilteredPolicy(filter interface{}) error {
return e.loadFilteredPolicy(filter)
}
// IsFiltered returns true if the loaded policy has been filtered.
func (e *Enforcer) IsFiltered() bool {
filteredAdapter, ok := e.adapter.(persist.FilteredAdapter)
if !ok {
return false
}
return filteredAdapter.IsFiltered()
}
// SavePolicy saves the current policy (usually after changed with Casbin API) back to file/database.
func (e *Enforcer) SavePolicy() error {
if e.IsFiltered() {
return errors.New("cannot save a filtered policy")
}
if err := e.adapter.SavePolicy(e.model); err != nil {
return err
}
if e.watcher != nil {
var err error
if watcher, ok := e.watcher.(persist.WatcherEx); ok {
err = watcher.UpdateForSavePolicy(e.model)
} else {
err = e.watcher.Update()
}
return err
}
return nil
}
func (e *Enforcer) initRmMap() {
for ptype := range e.model["g"] {
if rm, ok := e.rmMap[ptype]; ok {
_ = rm.Clear()
} else {
e.rmMap[ptype] = defaultrolemanager.NewRoleManager(10)
}
}
}
// EnableEnforce changes the enforcing state of Casbin, when Casbin is disabled, all access will be allowed by the Enforce() function.
func (e *Enforcer) EnableEnforce(enable bool) {
e.enabled = enable
}
// EnableLog changes whether Casbin will log messages to the Logger.
func (e *Enforcer) EnableLog(enable bool) {
e.logger.EnableLog(enable)
}
// IsLogEnabled returns the current logger's enabled status.
func (e *Enforcer) IsLogEnabled() bool {
return e.logger.IsEnabled()
}
// EnableAutoNotifyWatcher controls whether to save a policy rule automatically notify the Watcher when it is added or removed.
func (e *Enforcer) EnableAutoNotifyWatcher(enable bool) {
e.autoNotifyWatcher = enable
}
// EnableAutoNotifyDispatcher controls whether to save a policy rule automatically notify the Dispatcher when it is added or removed.
func (e *Enforcer) EnableAutoNotifyDispatcher(enable bool) {
e.autoNotifyDispatcher = enable
}
// EnableAutoSave controls whether to save a policy rule automatically to the adapter when it is added or removed.
func (e *Enforcer) EnableAutoSave(autoSave bool) {
e.autoSave = autoSave
}
// EnableAutoBuildRoleLinks controls whether to rebuild the role inheritance relations when a role is added or deleted.
func (e *Enforcer) EnableAutoBuildRoleLinks(autoBuildRoleLinks bool) {
e.autoBuildRoleLinks = autoBuildRoleLinks
}
// BuildRoleLinks manually rebuild the role inheritance relations.
func (e *Enforcer) BuildRoleLinks() error {
for _, rm := range e.rmMap {
err := rm.Clear()
if err != nil {
return err
}
}
return e.model.BuildRoleLinks(e.rmMap)
}
// BuildIncrementalRoleLinks provides incremental build the role inheritance relations.
func (e *Enforcer) BuildIncrementalRoleLinks(op model.PolicyOp, ptype string, rules [][]string) error {
return e.model.BuildIncrementalRoleLinks(e.rmMap, op, "g", ptype, rules)
}
// NewEnforceContext Create a default structure based on the suffix
func NewEnforceContext(suffix string) EnforceContext {
return EnforceContext{
rType: "r" + suffix,
pType: "p" + suffix,
eType: "e" + suffix,
mType: "m" + suffix,
}
}
// 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 "".
func (e *Enforcer) enforce(matcher string, explains *[]string, rvals ...interface{}) (ok bool, err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("panic: %v", r)
}
}()
if !e.enabled {
return true, nil
}
functions := e.fm.GetFunctions()
if _, ok := e.model["g"]; ok {
for key, ast := range e.model["g"] {
rm := ast.RM
functions[key] = util.GenerateGFunction(rm)
}
}
var (
rType = "r"
pType = "p"
eType = "e"
mType = "m"
)
if len(rvals) != 0 {
switch rvals[0].(type) {
case EnforceContext:
enforceContext := rvals[0].(EnforceContext)
rType = enforceContext.rType
pType = enforceContext.pType
eType = enforceContext.eType
mType = enforceContext.mType
rvals = rvals[1:]
default:
break
}
}
var expString string
if matcher == "" {
expString = e.model["m"][mType].Value
} else {
expString = util.RemoveComments(util.EscapeAssertion(matcher))
}
var expression *govaluate.EvaluableExpression
hasEval := util.HasEval(expString)
if !hasEval {
expression, err = govaluate.NewEvaluableExpressionWithFunctions(expString, functions)
if err != nil {
return false, err
}
}
rTokens := make(map[string]int, len(e.model["r"][rType].Tokens))
for i, token := range e.model["r"][rType].Tokens {
rTokens[token] = i
}
pTokens := make(map[string]int, len(e.model["p"][pType].Tokens))
for i, token := range e.model["p"][pType].Tokens {
pTokens[token] = i
}
parameters := enforceParameters{
rTokens: rTokens,
rVals: rvals,
pTokens: pTokens,
}
if len(e.model["r"][rType].Tokens) != len(rvals) {
return false, fmt.Errorf(
"invalid request size: expected %d, got %d, rvals: %v",
len(e.model["r"][rType].Tokens),
len(rvals),
rvals)
}
var policyEffects []effector.Effect
var matcherResults []float64
var effect effector.Effect
var explainIndex int
if policyLen := len(e.model["p"][pType].Policy); policyLen != 0 {
policyEffects = make([]effector.Effect, policyLen)
matcherResults = make([]float64, policyLen)
for policyIndex, pvals := range e.model["p"][pType].Policy {
// log.LogPrint("Policy Rule: ", pvals)
if len(e.model["p"][pType].Tokens) != len(pvals) {
return false, fmt.Errorf(
"invalid policy size: expected %d, got %d, pvals: %v",
len(e.model["p"][pType].Tokens),
len(pvals),
pvals)
}
parameters.pVals = pvals
if hasEval {
ruleNames := util.GetEvalValue(expString)
replacements := make(map[string]string)
for _, ruleName := range ruleNames {
if j, ok := parameters.pTokens[ruleName]; ok {
rule := util.EscapeAssertion(pvals[j])
replacements[ruleName] = rule
} else {
return false, errors.New("please make sure rule exists in policy when using eval() in matcher")
}
}
expWithRule := util.ReplaceEvalWithMap(expString, replacements)
expression, err = govaluate.NewEvaluableExpressionWithFunctions(expWithRule, functions)
if err != nil {
return false, fmt.Errorf("p.sub_rule should satisfy the syntax of matcher: %s", err)
}
}
result, err := expression.Eval(parameters)
// log.LogPrint("Result: ", result)
if err != nil {
return false, err
}
// set to no-match at first
matcherResults[policyIndex] = 0
switch result := result.(type) {
case bool:
if result {
matcherResults[policyIndex] = 1
}
case float64:
if result != 0 {
matcherResults[policyIndex] = 1
}
default:
return false, errors.New("matcher result should be bool, int or float")
}
if j, ok := parameters.pTokens[pType+"_eft"]; ok {
eft := parameters.pVals[j]
if eft == "allow" {
policyEffects[policyIndex] = effector.Allow
} else if eft == "deny" {
policyEffects[policyIndex] = effector.Deny
} else {
policyEffects[policyIndex] = effector.Indeterminate
}
} else {
policyEffects[policyIndex] = effector.Allow
}
//if e.model["e"]["e"].Value == "priority(p_eft) || deny" {
// break
//}
effect, explainIndex, err = e.eft.MergeEffects(e.model["e"][eType].Value, policyEffects[:policyIndex+1], matcherResults[:policyIndex+1], policyIndex, policyLen)
if err != nil {
return false, err
}
if effect != effector.Indeterminate {
break
}
}
} else {
if hasEval && len(e.model["p"][pType].Policy) == 0 {
return false, errors.New("please make sure rule exists in policy when using eval() in matcher")
}
policyEffects = make([]effector.Effect, 1)
matcherResults = make([]float64, 1)
matcherResults[0] = 1
parameters.pVals = make([]string, len(parameters.pTokens))
result, err := expression.Eval(parameters)
if err != nil {
return false, err
}
if result.(bool) {
policyEffects[0] = effector.Allow
} else {
policyEffects[0] = effector.Indeterminate
}
effect, explainIndex, err = e.eft.MergeEffects(e.model["e"][eType].Value, policyEffects, matcherResults, 0, 1)
if err != nil {
return false, err
}
}
var logExplains [][]string
if explains != nil {
logExplains = append(logExplains, *explains)
if explainIndex != -1 && len(e.model["p"][pType].Policy) > explainIndex {
*explains = e.model["p"][pType].Policy[explainIndex]
}
}
// effect -> result
result := false
if effect == effector.Allow {
result = true
}
e.logger.LogEnforce(expString, rvals, result, logExplains)
return result, nil
}
// Enforce decides whether a "subject" can access a "object" with the operation "action", input parameters are usually: (sub, obj, act).
func (e *Enforcer) Enforce(rvals ...interface{}) (bool, error) {
return e.enforce("", nil, rvals...)
}
// 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 "".
func (e *Enforcer) EnforceWithMatcher(matcher string, rvals ...interface{}) (bool, error) {
return e.enforce(matcher, nil, rvals...)
}
// EnforceEx explain enforcement by informing matched rules
func (e *Enforcer) EnforceEx(rvals ...interface{}) (bool, []string, error) {
explain := []string{}
result, err := e.enforce("", &explain, rvals...)
return result, explain, err
}
// EnforceExWithMatcher use a custom matcher and explain enforcement by informing matched rules
func (e *Enforcer) EnforceExWithMatcher(matcher string, rvals ...interface{}) (bool, []string, error) {
explain := []string{}
result, err := e.enforce(matcher, &explain, rvals...)
return result, explain, err
}
// BatchEnforce enforce in batches
func (e *Enforcer) BatchEnforce(requests [][]interface{}) ([]bool, error) {
var results []bool
for _, request := range requests {
result, err := e.enforce("", nil, request...)
if err != nil {
return results, err
}
results = append(results, result)
}
return results, nil
}
// BatchEnforceWithMatcher enforce with matcher in batches
func (e *Enforcer) BatchEnforceWithMatcher(matcher string, requests [][]interface{}) ([]bool, error) {
var results []bool
for _, request := range requests {
result, err := e.enforce(matcher, nil, request...)
if err != nil {
return results, err
}
results = append(results, result)
}
return results, nil
}
// AddNamedMatchingFunc add MatchingFunc by ptype RoleManager
func (e *Enforcer) AddNamedMatchingFunc(ptype, name string, fn defaultrolemanager.MatchingFunc) bool {
if rm, ok := e.rmMap[ptype]; ok {
rm.(*defaultrolemanager.RoleManager).AddMatchingFunc(name, fn)
return true
}
return false
}
// AddNamedDomainMatchingFunc add MatchingFunc by ptype to RoleManager
func (e *Enforcer) AddNamedDomainMatchingFunc(ptype, name string, fn defaultrolemanager.MatchingFunc) bool {
if rm, ok := e.rmMap[ptype]; ok {
rm.(*defaultrolemanager.RoleManager).AddDomainMatchingFunc(name, fn)
return true
}
return false
}
// assumes bounds have already been checked
type enforceParameters struct {
rTokens map[string]int
rVals []interface{}
pTokens map[string]int
pVals []string
}
// implements govaluate.Parameters
func (p enforceParameters) Get(name string) (interface{}, error) {
if name == "" {
return nil, nil
}
switch name[0] {
case 'p':
i, ok := p.pTokens[name]
if !ok {
return nil, errors.New("No parameter '" + name + "' found.")
}
return p.pVals[i], nil
case 'r':
i, ok := p.rTokens[name]
if !ok {
return nil, errors.New("No parameter '" + name + "' found.")
}
return p.rVals[i], nil
default:
return nil, errors.New("No parameter '" + name + "' found.")
}
}