db6b7db06d
The current LDAP sync routine has order n^2 efficiency. This change reduces this to order n.log n. Signed-off-by: Andrew Thornton <art27@cantab.net>
451 lines
12 KiB
Go
451 lines
12 KiB
Go
// Copyright 2014 The Gogs Authors. All rights reserved.
|
|
// Copyright 2020 The Gitea Authors. All rights reserved.
|
|
// Use of this source code is governed by a MIT-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package ldap
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"code.gitea.io/gitea/modules/log"
|
|
|
|
"github.com/go-ldap/ldap/v3"
|
|
)
|
|
|
|
// SearchResult : user data
|
|
type SearchResult struct {
|
|
Username string // Username
|
|
Name string // Name
|
|
Surname string // Surname
|
|
Mail string // E-mail address
|
|
SSHPublicKey []string // SSH Public Key
|
|
IsAdmin bool // if user is administrator
|
|
IsRestricted bool // if user is restricted
|
|
LowerName string // Lowername
|
|
}
|
|
|
|
func (ls *Source) sanitizedUserQuery(username string) (string, bool) {
|
|
// See http://tools.ietf.org/search/rfc4515
|
|
badCharacters := "\x00()*\\"
|
|
if strings.ContainsAny(username, badCharacters) {
|
|
log.Debug("'%s' contains invalid query characters. Aborting.", username)
|
|
return "", false
|
|
}
|
|
|
|
return fmt.Sprintf(ls.Filter, username), true
|
|
}
|
|
|
|
func (ls *Source) sanitizedUserDN(username string) (string, bool) {
|
|
// See http://tools.ietf.org/search/rfc4514: "special characters"
|
|
badCharacters := "\x00()*\\,='\"#+;<>"
|
|
if strings.ContainsAny(username, badCharacters) {
|
|
log.Debug("'%s' contains invalid DN characters. Aborting.", username)
|
|
return "", false
|
|
}
|
|
|
|
return fmt.Sprintf(ls.UserDN, username), true
|
|
}
|
|
|
|
func (ls *Source) sanitizedGroupFilter(group string) (string, bool) {
|
|
// See http://tools.ietf.org/search/rfc4515
|
|
badCharacters := "\x00*\\"
|
|
if strings.ContainsAny(group, badCharacters) {
|
|
log.Trace("Group filter invalid query characters: %s", group)
|
|
return "", false
|
|
}
|
|
|
|
return group, true
|
|
}
|
|
|
|
func (ls *Source) sanitizedGroupDN(groupDn string) (string, bool) {
|
|
// See http://tools.ietf.org/search/rfc4514: "special characters"
|
|
badCharacters := "\x00()*\\'\"#+;<>"
|
|
if strings.ContainsAny(groupDn, badCharacters) || strings.HasPrefix(groupDn, " ") || strings.HasSuffix(groupDn, " ") {
|
|
log.Trace("Group DN contains invalid query characters: %s", groupDn)
|
|
return "", false
|
|
}
|
|
|
|
return groupDn, true
|
|
}
|
|
|
|
func (ls *Source) findUserDN(l *ldap.Conn, name string) (string, bool) {
|
|
log.Trace("Search for LDAP user: %s", name)
|
|
|
|
// A search for the user.
|
|
userFilter, ok := ls.sanitizedUserQuery(name)
|
|
if !ok {
|
|
return "", false
|
|
}
|
|
|
|
log.Trace("Searching for DN using filter %s and base %s", userFilter, ls.UserBase)
|
|
search := ldap.NewSearchRequest(
|
|
ls.UserBase, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0,
|
|
false, userFilter, []string{}, nil)
|
|
|
|
// Ensure we found a user
|
|
sr, err := l.Search(search)
|
|
if err != nil || len(sr.Entries) < 1 {
|
|
log.Debug("Failed search using filter[%s]: %v", userFilter, err)
|
|
return "", false
|
|
} else if len(sr.Entries) > 1 {
|
|
log.Debug("Filter '%s' returned more than one user.", userFilter)
|
|
return "", false
|
|
}
|
|
|
|
userDN := sr.Entries[0].DN
|
|
if userDN == "" {
|
|
log.Error("LDAP search was successful, but found no DN!")
|
|
return "", false
|
|
}
|
|
|
|
return userDN, true
|
|
}
|
|
|
|
func dial(source *Source) (*ldap.Conn, error) {
|
|
log.Trace("Dialing LDAP with security protocol (%v) without verifying: %v", source.SecurityProtocol, source.SkipVerify)
|
|
|
|
tlsConfig := &tls.Config{
|
|
ServerName: source.Host,
|
|
InsecureSkipVerify: source.SkipVerify,
|
|
}
|
|
|
|
if source.SecurityProtocol == SecurityProtocolLDAPS {
|
|
return ldap.DialTLS("tcp", net.JoinHostPort(source.Host, strconv.Itoa(source.Port)), tlsConfig)
|
|
}
|
|
|
|
conn, err := ldap.Dial("tcp", net.JoinHostPort(source.Host, strconv.Itoa(source.Port)))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("error during Dial: %v", err)
|
|
}
|
|
|
|
if source.SecurityProtocol == SecurityProtocolStartTLS {
|
|
if err = conn.StartTLS(tlsConfig); err != nil {
|
|
conn.Close()
|
|
return nil, fmt.Errorf("error during StartTLS: %v", err)
|
|
}
|
|
}
|
|
|
|
return conn, nil
|
|
}
|
|
|
|
func bindUser(l *ldap.Conn, userDN, passwd string) error {
|
|
log.Trace("Binding with userDN: %s", userDN)
|
|
err := l.Bind(userDN, passwd)
|
|
if err != nil {
|
|
log.Debug("LDAP auth. failed for %s, reason: %v", userDN, err)
|
|
return err
|
|
}
|
|
log.Trace("Bound successfully with userDN: %s", userDN)
|
|
return err
|
|
}
|
|
|
|
func checkAdmin(l *ldap.Conn, ls *Source, userDN string) bool {
|
|
if len(ls.AdminFilter) == 0 {
|
|
return false
|
|
}
|
|
log.Trace("Checking admin with filter %s and base %s", ls.AdminFilter, userDN)
|
|
search := ldap.NewSearchRequest(
|
|
userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, ls.AdminFilter,
|
|
[]string{ls.AttributeName},
|
|
nil)
|
|
|
|
sr, err := l.Search(search)
|
|
|
|
if err != nil {
|
|
log.Error("LDAP Admin Search with filter %s for %s failed unexpectedly! (%v)", ls.AdminFilter, userDN, err)
|
|
} else if len(sr.Entries) < 1 {
|
|
log.Trace("LDAP Admin Search found no matching entries.")
|
|
} else {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func checkRestricted(l *ldap.Conn, ls *Source, userDN string) bool {
|
|
if len(ls.RestrictedFilter) == 0 {
|
|
return false
|
|
}
|
|
if ls.RestrictedFilter == "*" {
|
|
return true
|
|
}
|
|
log.Trace("Checking restricted with filter %s and base %s", ls.RestrictedFilter, userDN)
|
|
search := ldap.NewSearchRequest(
|
|
userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, ls.RestrictedFilter,
|
|
[]string{ls.AttributeName},
|
|
nil)
|
|
|
|
sr, err := l.Search(search)
|
|
|
|
if err != nil {
|
|
log.Error("LDAP Restrictred Search with filter %s for %s failed unexpectedly! (%v)", ls.RestrictedFilter, userDN, err)
|
|
} else if len(sr.Entries) < 1 {
|
|
log.Trace("LDAP Restricted Search found no matching entries.")
|
|
} else {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// SearchEntry : search an LDAP source if an entry (name, passwd) is valid and in the specific filter
|
|
func (ls *Source) SearchEntry(name, passwd string, directBind bool) *SearchResult {
|
|
// See https://tools.ietf.org/search/rfc4513#section-5.1.2
|
|
if len(passwd) == 0 {
|
|
log.Debug("Auth. failed for %s, password cannot be empty", name)
|
|
return nil
|
|
}
|
|
l, err := dial(ls)
|
|
if err != nil {
|
|
log.Error("LDAP Connect error, %s:%v", ls.Host, err)
|
|
ls.Enabled = false
|
|
return nil
|
|
}
|
|
defer l.Close()
|
|
|
|
var userDN string
|
|
if directBind {
|
|
log.Trace("LDAP will bind directly via UserDN template: %s", ls.UserDN)
|
|
|
|
var ok bool
|
|
userDN, ok = ls.sanitizedUserDN(name)
|
|
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
err = bindUser(l, userDN, passwd)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
|
|
if ls.UserBase != "" {
|
|
// not everyone has a CN compatible with input name so we need to find
|
|
// the real userDN in that case
|
|
|
|
userDN, ok = ls.findUserDN(l, name)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
}
|
|
} else {
|
|
log.Trace("LDAP will use BindDN.")
|
|
|
|
var found bool
|
|
|
|
if ls.BindDN != "" && ls.BindPassword != "" {
|
|
err := l.Bind(ls.BindDN, ls.BindPassword)
|
|
if err != nil {
|
|
log.Debug("Failed to bind as BindDN[%s]: %v", ls.BindDN, err)
|
|
return nil
|
|
}
|
|
log.Trace("Bound as BindDN %s", ls.BindDN)
|
|
} else {
|
|
log.Trace("Proceeding with anonymous LDAP search.")
|
|
}
|
|
|
|
userDN, found = ls.findUserDN(l, name)
|
|
if !found {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
if !ls.AttributesInBind {
|
|
// binds user (checking password) before looking-up attributes in user context
|
|
err = bindUser(l, userDN, passwd)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
userFilter, ok := ls.sanitizedUserQuery(name)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
var isAttributeSSHPublicKeySet = len(strings.TrimSpace(ls.AttributeSSHPublicKey)) > 0
|
|
|
|
attribs := []string{ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail}
|
|
if len(strings.TrimSpace(ls.UserUID)) > 0 {
|
|
attribs = append(attribs, ls.UserUID)
|
|
}
|
|
if isAttributeSSHPublicKeySet {
|
|
attribs = append(attribs, ls.AttributeSSHPublicKey)
|
|
}
|
|
|
|
log.Trace("Fetching attributes '%v', '%v', '%v', '%v', '%v', '%v' with filter '%s' and base '%s'", ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail, ls.AttributeSSHPublicKey, ls.UserUID, userFilter, userDN)
|
|
search := ldap.NewSearchRequest(
|
|
userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, userFilter,
|
|
attribs, nil)
|
|
|
|
sr, err := l.Search(search)
|
|
if err != nil {
|
|
log.Error("LDAP Search failed unexpectedly! (%v)", err)
|
|
return nil
|
|
} else if len(sr.Entries) < 1 {
|
|
if directBind {
|
|
log.Trace("User filter inhibited user login.")
|
|
} else {
|
|
log.Trace("LDAP Search found no matching entries.")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
var sshPublicKey []string
|
|
|
|
username := sr.Entries[0].GetAttributeValue(ls.AttributeUsername)
|
|
firstname := sr.Entries[0].GetAttributeValue(ls.AttributeName)
|
|
surname := sr.Entries[0].GetAttributeValue(ls.AttributeSurname)
|
|
mail := sr.Entries[0].GetAttributeValue(ls.AttributeMail)
|
|
uid := sr.Entries[0].GetAttributeValue(ls.UserUID)
|
|
|
|
// Check group membership
|
|
if ls.GroupsEnabled {
|
|
groupFilter, ok := ls.sanitizedGroupFilter(ls.GroupFilter)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
groupDN, ok := ls.sanitizedGroupDN(ls.GroupDN)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
|
|
log.Trace("Fetching groups '%v' with filter '%s' and base '%s'", ls.GroupMemberUID, groupFilter, groupDN)
|
|
groupSearch := ldap.NewSearchRequest(
|
|
groupDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, groupFilter,
|
|
[]string{ls.GroupMemberUID},
|
|
nil)
|
|
|
|
srg, err := l.Search(groupSearch)
|
|
if err != nil {
|
|
log.Error("LDAP group search failed: %v", err)
|
|
return nil
|
|
} else if len(srg.Entries) < 1 {
|
|
log.Error("LDAP group search failed: 0 entries")
|
|
return nil
|
|
}
|
|
|
|
isMember := false
|
|
Entries:
|
|
for _, group := range srg.Entries {
|
|
for _, member := range group.GetAttributeValues(ls.GroupMemberUID) {
|
|
if (ls.UserUID == "dn" && member == sr.Entries[0].DN) || member == uid {
|
|
isMember = true
|
|
break Entries
|
|
}
|
|
}
|
|
}
|
|
|
|
if !isMember {
|
|
log.Error("LDAP group membership test failed")
|
|
return nil
|
|
}
|
|
}
|
|
|
|
if isAttributeSSHPublicKeySet {
|
|
sshPublicKey = sr.Entries[0].GetAttributeValues(ls.AttributeSSHPublicKey)
|
|
}
|
|
isAdmin := checkAdmin(l, ls, userDN)
|
|
var isRestricted bool
|
|
if !isAdmin {
|
|
isRestricted = checkRestricted(l, ls, userDN)
|
|
}
|
|
|
|
if !directBind && ls.AttributesInBind {
|
|
// binds user (checking password) after looking-up attributes in BindDN context
|
|
err = bindUser(l, userDN, passwd)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
return &SearchResult{
|
|
LowerName: strings.ToLower(username),
|
|
Username: username,
|
|
Name: firstname,
|
|
Surname: surname,
|
|
Mail: mail,
|
|
SSHPublicKey: sshPublicKey,
|
|
IsAdmin: isAdmin,
|
|
IsRestricted: isRestricted,
|
|
}
|
|
}
|
|
|
|
// UsePagedSearch returns if need to use paged search
|
|
func (ls *Source) UsePagedSearch() bool {
|
|
return ls.SearchPageSize > 0
|
|
}
|
|
|
|
// SearchEntries : search an LDAP source for all users matching userFilter
|
|
func (ls *Source) SearchEntries() ([]*SearchResult, error) {
|
|
l, err := dial(ls)
|
|
if err != nil {
|
|
log.Error("LDAP Connect error, %s:%v", ls.Host, err)
|
|
ls.Enabled = false
|
|
return nil, err
|
|
}
|
|
defer l.Close()
|
|
|
|
if ls.BindDN != "" && ls.BindPassword != "" {
|
|
err := l.Bind(ls.BindDN, ls.BindPassword)
|
|
if err != nil {
|
|
log.Debug("Failed to bind as BindDN[%s]: %v", ls.BindDN, err)
|
|
return nil, err
|
|
}
|
|
log.Trace("Bound as BindDN %s", ls.BindDN)
|
|
} else {
|
|
log.Trace("Proceeding with anonymous LDAP search.")
|
|
}
|
|
|
|
userFilter := fmt.Sprintf(ls.Filter, "*")
|
|
|
|
var isAttributeSSHPublicKeySet = len(strings.TrimSpace(ls.AttributeSSHPublicKey)) > 0
|
|
|
|
attribs := []string{ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail}
|
|
if isAttributeSSHPublicKeySet {
|
|
attribs = append(attribs, ls.AttributeSSHPublicKey)
|
|
}
|
|
|
|
log.Trace("Fetching attributes '%v', '%v', '%v', '%v', '%v' with filter %s and base %s", ls.AttributeUsername, ls.AttributeName, ls.AttributeSurname, ls.AttributeMail, ls.AttributeSSHPublicKey, userFilter, ls.UserBase)
|
|
search := ldap.NewSearchRequest(
|
|
ls.UserBase, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, userFilter,
|
|
attribs, nil)
|
|
|
|
var sr *ldap.SearchResult
|
|
if ls.UsePagedSearch() {
|
|
sr, err = l.SearchWithPaging(search, ls.SearchPageSize)
|
|
} else {
|
|
sr, err = l.Search(search)
|
|
}
|
|
if err != nil {
|
|
log.Error("LDAP Search failed unexpectedly! (%v)", err)
|
|
return nil, err
|
|
}
|
|
|
|
result := make([]*SearchResult, len(sr.Entries))
|
|
|
|
for i, v := range sr.Entries {
|
|
result[i] = &SearchResult{
|
|
Username: v.GetAttributeValue(ls.AttributeUsername),
|
|
Name: v.GetAttributeValue(ls.AttributeName),
|
|
Surname: v.GetAttributeValue(ls.AttributeSurname),
|
|
Mail: v.GetAttributeValue(ls.AttributeMail),
|
|
IsAdmin: checkAdmin(l, ls, v.DN),
|
|
}
|
|
if !result[i].IsAdmin {
|
|
result[i].IsRestricted = checkRestricted(l, ls, v.DN)
|
|
}
|
|
if isAttributeSSHPublicKeySet {
|
|
result[i].SSHPublicKey = v.GetAttributeValues(ls.AttributeSSHPublicKey)
|
|
}
|
|
result[i].LowerName = strings.ToLower(result[i].Username)
|
|
|
|
}
|
|
|
|
return result, nil
|
|
}
|