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util.go
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util.go
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// Copyright 2022 The Casdoor 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 ldap
import (
"fmt"
"log"
"strings"
"github.com/casdoor/casdoor/object"
"github.com/casdoor/casdoor/util"
"github.com/lor00x/goldap/message"
ldap "github.com/forestmgy/ldapserver"
"github.com/xorm-io/builder"
)
type AttributeMapper func(user *object.User) message.AttributeValue
type FieldRelation struct {
userField string
notSearchable bool
hideOnStarOp bool
fieldMapper AttributeMapper
}
func (rel FieldRelation) GetField() (string, error) {
if rel.notSearchable {
return "", fmt.Errorf("attribute %s not supported", rel.userField)
}
return rel.userField, nil
}
func (rel FieldRelation) GetAttributeValue(user *object.User) message.AttributeValue {
return rel.fieldMapper(user)
}
var ldapAttributesMapping = map[string]FieldRelation{
"cn": {userField: "name", hideOnStarOp: true, fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Name)
}},
"uid": {userField: "name", hideOnStarOp: true, fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Name)
}},
"displayname": {userField: "displayName", fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.DisplayName)
}},
"email": {userField: "email", fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Email)
}},
"mail": {userField: "email", fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Email)
}},
"mobile": {userField: "phone", fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Phone)
}},
"title": {userField: "tag", fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(user.Tag)
}},
"userPassword": {
userField: "userPassword",
notSearchable: true,
fieldMapper: func(user *object.User) message.AttributeValue {
return message.AttributeValue(getUserPasswordWithType(user))
},
},
}
var AdditionalLdapAttributes []message.LDAPString
func init() {
for k, v := range ldapAttributesMapping {
if v.hideOnStarOp {
continue
}
AdditionalLdapAttributes = append(AdditionalLdapAttributes, message.LDAPString(k))
}
}
func getNameAndOrgFromDN(DN string) (string, string, error) {
DNFields := strings.Split(DN, ",")
params := make(map[string]string, len(DNFields))
for _, field := range DNFields {
if strings.Contains(field, "=") {
k := strings.Split(field, "=")
params[k[0]] = k[1]
}
}
if params["cn"] == "" {
return "", "", fmt.Errorf("please use Admin Name format like cn=xxx,ou=xxx,dc=example,dc=com")
}
if params["ou"] == "" {
return params["cn"], object.CasdoorOrganization, nil
}
return params["cn"], params["ou"], nil
}
func getNameAndOrgFromFilter(baseDN, filter string) (string, string, int) {
if !strings.Contains(baseDN, "ou=") {
return "", "", ldap.LDAPResultInvalidDNSyntax
}
name, org, err := getNameAndOrgFromDN(fmt.Sprintf("cn=%s,", getUsername(filter)) + baseDN)
if err != nil {
panic(err)
}
return name, org, ldap.LDAPResultSuccess
}
func getUsername(filter string) string {
nameIndex := strings.Index(filter, "cn=")
if nameIndex == -1 {
nameIndex = strings.Index(filter, "uid=")
if nameIndex == -1 {
return "*"
} else {
nameIndex += 4
}
} else {
nameIndex += 3
}
var name string
for i := nameIndex; filter[i] != ')'; i++ {
name = name + string(filter[i])
}
return name
}
func stringInSlice(value string, list []string) bool {
for _, item := range list {
if item == value {
return true
}
}
return false
}
func buildUserFilterCondition(filter interface{}) (builder.Cond, error) {
switch f := filter.(type) {
case message.FilterAnd:
conditions := make([]builder.Cond, len(f))
for i, v := range f {
cond, err := buildUserFilterCondition(v)
if err != nil {
return nil, err
}
conditions[i] = cond
}
return builder.And(conditions...), nil
case message.FilterOr:
conditions := make([]builder.Cond, len(f))
for i, v := range f {
cond, err := buildUserFilterCondition(v)
if err != nil {
return nil, err
}
conditions[i] = cond
}
return builder.Or(conditions...), nil
case message.FilterNot:
cond, err := buildUserFilterCondition(f.Filter)
if err != nil {
return nil, err
}
return builder.Not{cond}, nil
case message.FilterEqualityMatch:
field, err := getUserFieldFromAttribute(string(f.AttributeDesc()))
if err != nil {
return nil, err
}
return builder.Eq{field: string(f.AssertionValue())}, nil
case message.FilterPresent:
field, err := getUserFieldFromAttribute(string(f))
if err != nil {
return nil, err
}
return builder.NotNull{field}, nil
case message.FilterGreaterOrEqual:
field, err := getUserFieldFromAttribute(string(f.AttributeDesc()))
if err != nil {
return nil, err
}
return builder.Gte{field: string(f.AssertionValue())}, nil
case message.FilterLessOrEqual:
field, err := getUserFieldFromAttribute(string(f.AttributeDesc()))
if err != nil {
return nil, err
}
return builder.Lte{field: string(f.AssertionValue())}, nil
case message.FilterSubstrings:
field, err := getUserFieldFromAttribute(string(f.Type_()))
if err != nil {
return nil, err
}
var expr string
for _, substring := range f.Substrings() {
switch s := substring.(type) {
case message.SubstringInitial:
expr += string(s) + "%"
continue
case message.SubstringAny:
expr += string(s) + "%"
continue
case message.SubstringFinal:
expr += string(s)
continue
}
}
return builder.Expr(field+" LIKE ?", expr), nil
default:
return nil, fmt.Errorf("LDAP filter operation %#v not supported", f)
}
}
func buildSafeCondition(filter interface{}) builder.Cond {
condition, err := buildUserFilterCondition(filter)
if err != nil {
log.Printf("err = %v", err.Error())
return nil
}
return condition
}
func GetFilteredUsers(m *ldap.Message) (filteredUsers []*object.User, code int) {
var err error
r := m.GetSearchRequest()
name, org, code := getNameAndOrgFromFilter(string(r.BaseObject()), r.FilterString())
if code != ldap.LDAPResultSuccess {
return nil, code
}
if name == "*" && m.Client.IsOrgAdmin { // get all users from organization 'org'
if m.Client.IsGlobalAdmin && org == "*" {
filteredUsers, err = object.GetGlobalUsersWithFilter(buildSafeCondition(r.Filter()))
if err != nil {
panic(err)
}
return filteredUsers, ldap.LDAPResultSuccess
}
if m.Client.IsGlobalAdmin || org == m.Client.OrgName {
filteredUsers, err = object.GetUsersWithFilter(org, buildSafeCondition(r.Filter()))
if err != nil {
panic(err)
}
return filteredUsers, ldap.LDAPResultSuccess
} else {
return nil, ldap.LDAPResultInsufficientAccessRights
}
} else {
requestUserId := util.GetId(m.Client.OrgName, m.Client.UserName)
userId := util.GetId(org, name)
hasPermission, err := object.CheckUserPermission(requestUserId, userId, true, "en")
if !hasPermission {
log.Printf("err = %v", err.Error())
return nil, ldap.LDAPResultInsufficientAccessRights
}
user, err := object.GetUser(userId)
if err != nil {
panic(err)
}
if user != nil {
filteredUsers = append(filteredUsers, user)
return filteredUsers, ldap.LDAPResultSuccess
}
organization, err := object.GetOrganization(util.GetId("admin", org))
if err != nil {
panic(err)
}
if organization == nil {
return nil, ldap.LDAPResultNoSuchObject
}
if !stringInSlice(name, organization.Tags) {
return nil, ldap.LDAPResultNoSuchObject
}
users, err := object.GetUsersByTagWithFilter(org, name, buildSafeCondition(r.Filter()))
if err != nil {
panic(err)
}
filteredUsers = append(filteredUsers, users...)
return filteredUsers, ldap.LDAPResultSuccess
}
}
// get user password with hash type prefix
// TODO not handle salt yet
// @return {md5}5f4dcc3b5aa765d61d8327deb882cf99
func getUserPasswordWithType(user *object.User) string {
org, err := object.GetOrganizationByUser(user)
if err != nil {
panic(err)
}
if org.PasswordType == "" || org.PasswordType == "plain" {
return user.Password
}
prefix := org.PasswordType
if prefix == "salt" {
prefix = "sha256"
} else if prefix == "md5-salt" {
prefix = "md5"
} else if prefix == "pbkdf2-salt" {
prefix = "pbkdf2"
}
return fmt.Sprintf("{%s}%s", prefix, user.Password)
}
func getAttribute(attributeName string, user *object.User) message.AttributeValue {
v, ok := ldapAttributesMapping[attributeName]
if !ok {
return ""
}
return v.GetAttributeValue(user)
}
func getUserFieldFromAttribute(attributeName string) (string, error) {
v, ok := ldapAttributesMapping[attributeName]
if !ok {
return "", fmt.Errorf("attribute %s not supported", attributeName)
}
return v.GetField()
}