0
0
mirror of https://github.com/go-gitea/gitea.git synced 2024-12-05 05:07:58 +01:00
gitea/services/auth/source/ldap/source_search.go
zeripath f394019e9d
Report the associated filter if there is an error in LDAP (#17014)
If there is an error when performing the admin or restricted filter search
ensure that the filter and the userDN are reported.

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-09-11 00:46:27 +02:00

447 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
}
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{
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)
}
}
return result, nil
}