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733 lines (653 loc) · 22.4 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 (
"fmt"
"strings"
"github.com/casbin/casbin/v3/rbac"
"github.com/casbin/casbin/v3/constant"
"github.com/casbin/casbin/v3/errors"
"github.com/casbin/casbin/v3/util"
)
// GetRolesForUser gets the roles that a user has.
func (e *Enforcer) GetRolesForUser(name string, domain ...string) ([]string, error) {
rm := e.GetRoleManager()
if rm == nil {
return nil, fmt.Errorf("role manager is not initialized")
}
res, err := rm.GetRoles(name, domain...)
return res, err
}
// GetUsersForRole gets the users that has a role.
func (e *Enforcer) GetUsersForRole(name string, domain ...string) ([]string, error) {
rm := e.GetRoleManager()
if rm == nil {
return nil, fmt.Errorf("role manager is not initialized")
}
res, err := rm.GetUsers(name, domain...)
return res, err
}
// HasRoleForUser determines whether a user has a role.
func (e *Enforcer) HasRoleForUser(name string, role string, domain ...string) (bool, error) {
roles, err := e.GetRolesForUser(name, domain...)
if err != nil {
return false, err
}
hasRole := false
for _, r := range roles {
if r == role {
hasRole = true
break
}
}
return hasRole, nil
}
// AddRoleForUser adds a role for a user.
// Returns false if the user already has the role (aka not affected).
func (e *Enforcer) AddRoleForUser(user string, role string, domain ...string) (bool, error) {
args := []string{user, role}
args = append(args, domain...)
return e.AddGroupingPolicy(args)
}
// AddRolesForUser adds roles for a user.
// Returns false if the user already has the roles (aka not affected).
func (e *Enforcer) AddRolesForUser(user string, roles []string, domain ...string) (bool, error) {
var rules [][]string
for _, role := range roles {
rule := []string{user, role}
rule = append(rule, domain...)
rules = append(rules, rule)
}
return e.AddGroupingPolicies(rules)
}
// DeleteRoleForUser deletes a role for a user.
// Returns false if the user does not have the role (aka not affected).
func (e *Enforcer) DeleteRoleForUser(user string, role string, domain ...string) (bool, error) {
args := []string{user, role}
args = append(args, domain...)
return e.RemoveGroupingPolicy(args)
}
// DeleteRolesForUser deletes all roles for a user.
// Returns false if the user does not have any roles (aka not affected).
func (e *Enforcer) DeleteRolesForUser(user string, domain ...string) (bool, error) {
var args []string
if len(domain) == 0 {
args = []string{user}
} else if len(domain) > 1 {
return false, errors.ErrDomainParameter
} else {
args = []string{user, "", domain[0]}
}
return e.RemoveFilteredGroupingPolicy(0, args...)
}
// DeleteUser deletes a user.
// Returns false if the user does not exist (aka not affected).
func (e *Enforcer) DeleteUser(user string) (bool, error) {
var err error
res1, err := e.RemoveFilteredGroupingPolicy(0, user)
if err != nil {
return res1, err
}
subIndex, err := e.GetFieldIndex("p", constant.SubjectIndex)
if err != nil {
return false, err
}
res2, err := e.RemoveFilteredPolicy(subIndex, user)
return res1 || res2, err
}
// DeleteRole deletes a role.
// Returns false if the role does not exist (aka not affected).
func (e *Enforcer) DeleteRole(role string) (bool, error) {
var err error
res1, err := e.RemoveFilteredGroupingPolicy(0, role)
if err != nil {
return res1, err
}
res2, err := e.RemoveFilteredGroupingPolicy(1, role)
if err != nil {
return res1, err
}
subIndex, err := e.GetFieldIndex("p", constant.SubjectIndex)
if err != nil {
return false, err
}
res3, err := e.RemoveFilteredPolicy(subIndex, role)
return res1 || res2 || res3, err
}
// DeletePermission deletes a permission.
// Returns false if the permission does not exist (aka not affected).
func (e *Enforcer) DeletePermission(permission ...string) (bool, error) {
return e.RemoveFilteredPolicy(1, permission...)
}
// AddPermissionForUser adds a permission for a user or role.
// Returns false if the user or role already has the permission (aka not affected).
func (e *Enforcer) AddPermissionForUser(user string, permission ...string) (bool, error) {
return e.AddPolicy(util.JoinSlice(user, permission...))
}
// AddPermissionsForUser adds multiple permissions for a user or role.
// Returns false if the user or role already has one of the permissions (aka not affected).
func (e *Enforcer) AddPermissionsForUser(user string, permissions ...[]string) (bool, error) {
var rules [][]string
for _, permission := range permissions {
rules = append(rules, util.JoinSlice(user, permission...))
}
return e.AddPolicies(rules)
}
// DeletePermissionForUser deletes a permission for a user or role.
// Returns false if the user or role does not have the permission (aka not affected).
func (e *Enforcer) DeletePermissionForUser(user string, permission ...string) (bool, error) {
return e.RemovePolicy(util.JoinSlice(user, permission...))
}
// DeletePermissionsForUser deletes permissions for a user or role.
// Returns false if the user or role does not have any permissions (aka not affected).
func (e *Enforcer) DeletePermissionsForUser(user string) (bool, error) {
subIndex, err := e.GetFieldIndex("p", constant.SubjectIndex)
if err != nil {
return false, err
}
return e.RemoveFilteredPolicy(subIndex, user)
}
// GetPermissionsForUser gets permissions for a user or role.
func (e *Enforcer) GetPermissionsForUser(user string, domain ...string) ([][]string, error) {
return e.GetNamedPermissionsForUser("p", user, domain...)
}
// GetNamedPermissionsForUser gets permissions for a user or role by named policy.
func (e *Enforcer) GetNamedPermissionsForUser(ptype string, user string, domain ...string) ([][]string, error) {
permission := make([][]string, 0)
for pType, assertion := range e.model["p"] {
if pType != ptype {
continue
}
args := make([]string, len(assertion.Tokens))
subIndex, err := e.GetFieldIndex(ptype, constant.SubjectIndex)
if err != nil {
subIndex = 0
}
args[subIndex] = user
if len(domain) > 0 {
var index int
index, err = e.GetFieldIndex(ptype, constant.DomainIndex)
if err != nil {
return permission, err
}
args[index] = domain[0]
}
perm, err := e.GetFilteredNamedPolicy(ptype, 0, args...)
if err != nil {
return permission, err
}
permission = append(permission, perm...)
}
return permission, nil
}
// HasPermissionForUser determines whether a user has a permission.
func (e *Enforcer) HasPermissionForUser(user string, permission ...string) (bool, error) {
return e.HasPolicy(util.JoinSlice(user, permission...))
}
// GetImplicitRolesForUser gets implicit roles that a user has.
// Compared to GetRolesForUser(), this function retrieves indirect roles besides direct roles.
// For example:
// g, alice, role:admin
// g, role:admin, role:user
//
// GetRolesForUser("alice") can only get: ["role:admin"].
// But GetImplicitRolesForUser("alice") will get: ["role:admin", "role:user"].
func (e *Enforcer) GetImplicitRolesForUser(name string, domain ...string) ([]string, error) {
var res []string
for rm := range e.rmMap {
roles, err := e.GetNamedImplicitRolesForUser(rm, name, domain...)
if err != nil {
return nil, err
}
res = append(res, roles...)
}
for crm := range e.condRmMap {
roles, err := e.GetNamedImplicitRolesForUser(crm, name, domain...)
if err != nil {
return nil, err
}
res = append(res, roles...)
}
return res, nil
}
// GetNamedImplicitRolesForUser gets implicit roles that a user has by named role definition.
// Compared to GetImplicitRolesForUser(), this function retrieves indirect roles besides direct roles.
// For example:
// g, alice, role:admin
// g, role:admin, role:user
// g2, alice, role:admin2
//
// GetImplicitRolesForUser("alice") can only get: ["role:admin", "role:user"].
// But GetNamedImplicitRolesForUser("g2", "alice") will get: ["role:admin2"].
func (e *Enforcer) GetNamedImplicitRolesForUser(ptype string, name string, domain ...string) ([]string, error) {
rm := e.GetNamedRoleManager(ptype)
if rm == nil {
return nil, fmt.Errorf("role manager %s is not initialized", ptype)
}
// Use the role manager's GetImplicitRoles method which respects maxHierarchyLevel
return rm.GetImplicitRoles(name, domain...)
}
// GetImplicitUsersForRole gets implicit users for a role.
func (e *Enforcer) GetImplicitUsersForRole(name string, domain ...string) ([]string, error) {
res := []string{}
var rms []rbac.RoleManager
for _, rm := range e.rmMap {
rms = append(rms, rm)
}
for _, crm := range e.condRmMap {
rms = append(rms, crm)
}
for _, rm := range rms {
// Use the role manager's GetImplicitUsers method which respects maxHierarchyLevel
users, err := rm.GetImplicitUsers(name, domain...)
if err != nil && err.Error() != "error: name does not exist" {
return nil, err
}
res = append(res, users...)
}
return res, nil
}
// GetImplicitPermissionsForUser gets implicit permissions for a user or role.
// Compared to GetPermissionsForUser(), this function retrieves permissions for inherited roles.
// For example:
// p, admin, data1, read
// p, alice, data2, read
// g, alice, admin
//
// GetPermissionsForUser("alice") can only get: [["alice", "data2", "read"]].
// But GetImplicitPermissionsForUser("alice") will get: [["admin", "data1", "read"], ["alice", "data2", "read"]].
func (e *Enforcer) GetImplicitPermissionsForUser(user string, domain ...string) ([][]string, error) {
return e.GetNamedImplicitPermissionsForUser("p", "g", user, domain...)
}
// GetNamedImplicitPermissionsForUser gets implicit permissions for a user or role by named policy.
// Compared to GetNamedPermissionsForUser(), this function retrieves permissions for inherited roles.
// For example:
// p, admin, data1, read
// p2, admin, create
// g, alice, admin
//
// GetImplicitPermissionsForUser("alice") can only get: [["admin", "data1", "read"]], whose policy is default policy "p"
// But you can specify the named policy "p2" to get: [["admin", "create"]] by GetNamedImplicitPermissionsForUser("p2","alice").
func (e *Enforcer) GetNamedImplicitPermissionsForUser(ptype string, gtype string, user string, domain ...string) ([][]string, error) {
permission := make([][]string, 0)
rm := e.GetNamedRoleManager(gtype)
if rm == nil {
return nil, fmt.Errorf("role manager %s is not initialized", gtype)
}
roles, err := e.GetNamedImplicitRolesForUser(gtype, user, domain...)
if err != nil {
return nil, err
}
policyRoles := make(map[string]struct{}, len(roles)+1)
policyRoles[user] = struct{}{}
for _, r := range roles {
policyRoles[r] = struct{}{}
}
domainIndex, err := e.GetFieldIndex(ptype, constant.DomainIndex)
for _, rule := range e.model["p"][ptype].Policy {
if len(domain) == 0 {
if _, ok := policyRoles[rule[0]]; ok {
permission = append(permission, deepCopyPolicy(rule))
}
continue
}
if len(domain) > 1 {
return nil, errors.ErrDomainParameter
}
if err != nil {
return nil, err
}
d := domain[0]
matched := rm.Match(d, rule[domainIndex])
if !matched {
continue
}
if _, ok := policyRoles[rule[0]]; ok {
newRule := deepCopyPolicy(rule)
newRule[domainIndex] = d
permission = append(permission, newRule)
}
}
return permission, nil
}
// GetImplicitUsersForPermission gets implicit users for a permission.
// For example:
// p, admin, data1, read
// p, bob, data1, read
// g, alice, admin
//
// GetImplicitUsersForPermission("data1", "read") will get: ["alice", "bob"].
// Note: only users will be returned, roles (2nd arg in "g") will be excluded.
func (e *Enforcer) GetImplicitUsersForPermission(permission ...string) ([]string, error) {
pSubjects, err := e.GetAllSubjects()
if err != nil {
return nil, err
}
gInherit, err := e.model.GetValuesForFieldInPolicyAllTypes("g", 1)
if err != nil {
return nil, err
}
gSubjects, err := e.model.GetValuesForFieldInPolicyAllTypes("g", 0)
if err != nil {
return nil, err
}
subjects := append(pSubjects, gSubjects...)
util.ArrayRemoveDuplicates(&subjects)
subjects = util.SetSubtract(subjects, gInherit)
res := []string{}
for _, user := range subjects {
req := util.JoinSliceAny(user, permission...)
allowed, err := e.Enforce(req...)
if err != nil {
return nil, err
}
if allowed {
res = append(res, user)
}
}
return res, nil
}
// GetDomainsForUser gets all domains.
func (e *Enforcer) GetDomainsForUser(user string) ([]string, error) {
var domains []string
for _, rm := range e.rmMap {
domain, err := rm.GetDomains(user)
if err != nil {
return nil, err
}
domains = append(domains, domain...)
}
for _, crm := range e.condRmMap {
domain, err := crm.GetDomains(user)
if err != nil {
return nil, err
}
domains = append(domains, domain...)
}
return domains, nil
}
// GetImplicitResourcesForUser returns all policies that user obtaining in domain.
func (e *Enforcer) GetImplicitResourcesForUser(user string, domain ...string) ([][]string, error) {
permissions, err := e.GetImplicitPermissionsForUser(user, domain...)
if err != nil {
return nil, err
}
res := make([][]string, 0)
for _, permission := range permissions {
if permission[0] == user {
res = append(res, permission)
continue
}
resLocal := [][]string{{user}}
tokensLength := len(permission)
t := make([][]string, 1, tokensLength)
for _, token := range permission[1:] {
tokens, err := e.GetImplicitUsersForRole(token, domain...)
if err != nil {
return nil, err
}
tokens = append(tokens, token)
t = append(t, tokens)
}
for i := 1; i < tokensLength; i++ {
n := make([][]string, 0)
for _, tokens := range t[i] {
for _, policy := range resLocal {
t := append([]string(nil), policy...)
t = append(t, tokens)
n = append(n, t)
}
}
resLocal = n
}
res = append(res, resLocal...)
}
return res, nil
}
// deepCopyPolicy returns a deepcopy version of the policy to prevent changing policies through returned slice.
func deepCopyPolicy(src []string) []string {
newRule := make([]string, len(src))
copy(newRule, src)
return newRule
}
// GetAllowedObjectConditions returns a string array of object conditions that the user can access.
// For example: conditions, err := e.GetAllowedObjectConditions("alice", "read", "r.obj.")
// Note:
//
// 0. prefix: You can customize the prefix of the object conditions, and "r.obj." is commonly used as a prefix.
// After removing the prefix, the remaining part is the condition of the object.
// If there is an obj policy that does not meet the prefix requirement, an errors.ERR_OBJ_CONDITION will be returned.
//
// 1. If the 'objectConditions' array is empty, return errors.ERR_EMPTY_CONDITION
// This error is returned because some data adapters' ORM return full table data by default
// when they receive an empty condition, which tends to behave contrary to expectations.(e.g. GORM)
// If you are using an adapter that does not behave like this, you can choose to ignore this error.
func (e *Enforcer) GetAllowedObjectConditions(user string, action string, prefix string) ([]string, error) {
permissions, err := e.GetImplicitPermissionsForUser(user)
if err != nil {
return nil, err
}
var objectConditions []string
for _, policy := range permissions {
// policy {sub, obj, act}
if policy[2] == action {
if !strings.HasPrefix(policy[1], prefix) {
return nil, errors.ErrObjCondition
}
objectConditions = append(objectConditions, strings.TrimPrefix(policy[1], prefix))
}
}
if len(objectConditions) == 0 {
return nil, errors.ErrEmptyCondition
}
return objectConditions, nil
}
// removeDuplicatePermissions Convert permissions to string as a hash to deduplicate.
func removeDuplicatePermissions(permissions [][]string) [][]string {
permissionsSet := make(map[string]bool)
res := make([][]string, 0)
for _, permission := range permissions {
permissionStr := util.ArrayToString(permission)
if permissionsSet[permissionStr] {
continue
}
permissionsSet[permissionStr] = true
res = append(res, permission)
}
return res
}
// GetImplicitUsersForResource return implicit user based on resource.
// for example:
// p, alice, data1, read
// p, bob, data2, write
// p, data2_admin, data2, read
// p, data2_admin, data2, write
// g, alice, data2_admin
// GetImplicitUsersForResource("data2") will return [[bob data2 write] [alice data2 read] [alice data2 write]]
// GetImplicitUsersForResource("data1") will return [[alice data1 read]]
// Note: only users will be returned, roles (2nd arg in "g") will be excluded.
func (e *Enforcer) GetImplicitUsersForResource(resource string) ([][]string, error) {
return e.GetNamedImplicitUsersForResource("g", resource)
}
// GetNamedImplicitUsersForResource return implicit user based on resource with named policy support.
// This function handles resource role relationships through named policies (e.g., g2, g3, etc.).
// for example:
// p, admin_group, admin_data, *
// g, admin, admin_group
// g2, app, admin_data
// GetNamedImplicitUsersForResource("g2", "app") will return users who have access to admin_data through g2 relationship.
func (e *Enforcer) GetNamedImplicitUsersForResource(ptype string, resource string) ([][]string, error) {
permissions := make([][]string, 0)
subjectIndex, _ := e.GetFieldIndex("p", "sub")
objectIndex, _ := e.GetFieldIndex("p", "obj")
rm := e.GetRoleManager()
if rm == nil {
return nil, fmt.Errorf("role manager is not initialized")
}
isRole := make(map[string]bool)
roles, err := e.GetAllRoles()
if err != nil {
return nil, err
}
for _, role := range roles {
isRole[role] = true
}
// Get all resource types that the resource can access through ptype (e.g., g2)
ptypePolicies, _ := e.GetNamedGroupingPolicy(ptype)
resourceAccessibleResourceTypes := make(map[string]bool)
for _, ptypePolicy := range ptypePolicies {
if ptypePolicy[0] == resource { // ptypePolicy[0] is the resource
resourceAccessibleResourceTypes[ptypePolicy[1]] = true // ptypePolicy[1] is the resource type it can access
}
}
for _, rule := range e.model["p"]["p"].Policy {
obj := rule[objectIndex]
sub := rule[subjectIndex]
// Check if this policy is directly for the resource OR for a resource type the resource can access
if obj == resource || resourceAccessibleResourceTypes[obj] {
if !isRole[sub] {
permissions = append(permissions, rule)
} else {
users, err := rm.GetUsers(sub)
if err != nil {
continue
}
for _, user := range users {
implicitUserRule := deepCopyPolicy(rule)
implicitUserRule[subjectIndex] = user
permissions = append(permissions, implicitUserRule)
}
}
}
}
res := removeDuplicatePermissions(permissions)
return res, nil
}
// GetImplicitUsersForResourceByDomain return implicit user based on resource and domain.
// Compared to GetImplicitUsersForResource, domain is supported.
func (e *Enforcer) GetImplicitUsersForResourceByDomain(resource string, domain string) ([][]string, error) {
permissions := make([][]string, 0)
subjectIndex, _ := e.GetFieldIndex("p", "sub")
objectIndex, _ := e.GetFieldIndex("p", "obj")
domIndex, _ := e.GetFieldIndex("p", "dom")
rm := e.GetRoleManager()
if rm == nil {
return nil, fmt.Errorf("role manager is not initialized")
}
isRole := make(map[string]bool)
if roles, err := e.GetAllRolesByDomain(domain); err != nil {
return nil, err
} else {
for _, role := range roles {
isRole[role] = true
}
}
for _, rule := range e.model["p"]["p"].Policy {
obj := rule[objectIndex]
if obj != resource {
continue
}
sub := rule[subjectIndex]
if !isRole[sub] {
permissions = append(permissions, rule)
} else {
if domain != rule[domIndex] {
continue
}
users, err := rm.GetUsers(sub, domain)
if err != nil {
return nil, err
}
for _, user := range users {
implicitUserRule := deepCopyPolicy(rule)
implicitUserRule[subjectIndex] = user
permissions = append(permissions, implicitUserRule)
}
}
}
res := removeDuplicatePermissions(permissions)
return res, nil
}
// GetImplicitObjectPatternsForUser returns all object patterns (with wildcards) that a user has for a given domain and action.
// For example:
// p, admin, chronicle/123, location/*, read
// p, user, chronicle/456, location/789, read
// g, alice, admin
// g, bob, user
//
// GetImplicitObjectPatternsForUser("alice", "chronicle/123", "read") will return ["location/*"].
// GetImplicitObjectPatternsForUser("bob", "chronicle/456", "read") will return ["location/789"].
func (e *Enforcer) GetImplicitObjectPatternsForUser(user string, domain string, action string) ([]string, error) {
roles, err := e.GetImplicitRolesForUser(user, domain)
if err != nil {
return nil, err
}
subjects := append([]string{user}, roles...)
subjectIndex, _ := e.GetFieldIndex("p", constant.SubjectIndex)
domainIndex, _ := e.GetFieldIndex("p", constant.DomainIndex)
objectIndex, _ := e.GetFieldIndex("p", constant.ObjectIndex)
actionIndex, _ := e.GetFieldIndex("p", constant.ActionIndex)
patterns := make(map[string]struct{})
for _, rule := range e.model["p"]["p"].Policy {
sub := rule[subjectIndex]
matched := false
for _, subject := range subjects {
if sub == subject {
matched = true
break
}
}
if !matched {
continue
}
if !e.matchDomain(domainIndex, domain, rule) {
continue
}
ruleAction := rule[actionIndex]
if ruleAction != action && ruleAction != "*" {
continue
}
obj := rule[objectIndex]
patterns[obj] = struct{}{}
}
result := make([]string, 0, len(patterns))
for pattern := range patterns {
result = append(result, pattern)
}
return result, nil
}
// matchDomain checks if the domain matches the rule domain using pattern matching.
func (e *Enforcer) matchDomain(domainIndex int, domain string, rule []string) bool {
if domainIndex < 0 || domain == "" {
return true
}
ruleDomain := rule[domainIndex]
if ruleDomain == domain {
return true
}
for _, rm := range e.rmMap {
if rm.Match(domain, ruleDomain) {
return true
}
}
for _, crm := range e.condRmMap {
if crm.Match(domain, ruleDomain) {
return true
}
}
return false
}