authelia/internal/authentication/ldap_user_provider.go

326 lines
9.2 KiB
Go

package authentication
import (
"crypto/tls"
"crypto/x509"
"fmt"
"net"
"strings"
"github.com/go-ldap/ldap/v3"
"github.com/sirupsen/logrus"
"golang.org/x/text/encoding/unicode"
"github.com/authelia/authelia/v4/internal/configuration/schema"
"github.com/authelia/authelia/v4/internal/logging"
"github.com/authelia/authelia/v4/internal/utils"
)
// LDAPUserProvider is a UserProvider that connects to LDAP servers like ActiveDirectory, OpenLDAP, OpenDJ, FreeIPA, etc.
type LDAPUserProvider struct {
configuration schema.LDAPAuthenticationBackendConfiguration
tlsConfig *tls.Config
dialOpts []ldap.DialOpt
log *logrus.Logger
connectionFactory LDAPConnectionFactory
disableResetPassword bool
// Automatically detected ldap features.
supportExtensionPasswdModify bool
// Dynamically generated users values.
usersBaseDN string
usersAttributes []string
usersFilterReplacementInput bool
// Dynamically generated groups values.
groupsBaseDN string
groupsAttributes []string
groupsFilterReplacementInput bool
groupsFilterReplacementUsername bool
groupsFilterReplacementDN bool
}
// NewLDAPUserProvider creates a new instance of LDAPUserProvider.
func NewLDAPUserProvider(configuration schema.AuthenticationBackendConfiguration, certPool *x509.CertPool) (provider *LDAPUserProvider) {
provider = newLDAPUserProvider(*configuration.LDAP, configuration.DisableResetPassword, certPool, nil)
return provider
}
func newLDAPUserProvider(configuration schema.LDAPAuthenticationBackendConfiguration, disableResetPassword bool, certPool *x509.CertPool, factory LDAPConnectionFactory) (provider *LDAPUserProvider) {
if configuration.TLS == nil {
configuration.TLS = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS
}
tlsConfig := utils.NewTLSConfig(configuration.TLS, tls.VersionTLS12, certPool)
var dialOpts = []ldap.DialOpt{
ldap.DialWithDialer(&net.Dialer{Timeout: configuration.Timeout}),
}
if tlsConfig != nil {
dialOpts = append(dialOpts, ldap.DialWithTLSConfig(tlsConfig))
}
if factory == nil {
factory = NewLDAPConnectionFactoryImpl()
}
provider = &LDAPUserProvider{
configuration: configuration,
tlsConfig: tlsConfig,
dialOpts: dialOpts,
log: logging.Logger(),
connectionFactory: factory,
disableResetPassword: disableResetPassword,
}
provider.parseDynamicUsersConfiguration()
provider.parseDynamicGroupsConfiguration()
return provider
}
func (p *LDAPUserProvider) connect(userDN string, password string) (LDAPConnection, error) {
conn, err := p.connectionFactory.DialURL(p.configuration.URL, p.dialOpts...)
if err != nil {
return nil, err
}
if p.configuration.StartTLS {
if err := conn.StartTLS(p.tlsConfig); err != nil {
return nil, err
}
}
if err := conn.Bind(userDN, password); err != nil {
return nil, err
}
return conn, nil
}
// CheckUserPassword checks if provided password matches for the given user.
func (p *LDAPUserProvider) CheckUserPassword(inputUsername string, password string) (bool, error) {
conn, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return false, err
}
defer conn.Close()
profile, err := p.getUserProfile(conn, inputUsername)
if err != nil {
return false, err
}
userConn, err := p.connect(profile.DN, password)
if err != nil {
return false, fmt.Errorf("authentication failed. Cause: %w", err)
}
defer userConn.Close()
return true, nil
}
func (p *LDAPUserProvider) ldapEscape(inputUsername string) string {
inputUsername = ldap.EscapeFilter(inputUsername)
for _, c := range specialLDAPRunes {
inputUsername = strings.ReplaceAll(inputUsername, string(c), fmt.Sprintf("\\%c", c))
}
return inputUsername
}
type ldapUserProfile struct {
DN string
Emails []string
DisplayName string
Username string
}
func (p *LDAPUserProvider) resolveUsersFilter(inputUsername string) (filter string) {
filter = p.configuration.UsersFilter
if p.usersFilterReplacementInput {
// The {input} placeholder is replaced by the users username input.
filter = strings.ReplaceAll(filter, ldapPlaceholderInput, p.ldapEscape(inputUsername))
}
p.log.Tracef("Computed user filter is %s", filter)
return filter
}
func (p *LDAPUserProvider) getUserProfile(conn LDAPConnection, inputUsername string) (*ldapUserProfile, error) {
userFilter := p.resolveUsersFilter(inputUsername)
// Search for the given username.
searchRequest := ldap.NewSearchRequest(
p.usersBaseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
1, 0, false, userFilter, p.usersAttributes, nil,
)
sr, err := conn.Search(searchRequest)
if err != nil {
return nil, fmt.Errorf("cannot find user DN of user '%s'. Cause: %w", inputUsername, err)
}
if len(sr.Entries) == 0 {
return nil, ErrUserNotFound
}
if len(sr.Entries) > 1 {
return nil, fmt.Errorf("multiple users %s found", inputUsername)
}
userProfile := ldapUserProfile{
DN: sr.Entries[0].DN,
}
for _, attr := range sr.Entries[0].Attributes {
if attr.Name == p.configuration.DisplayNameAttribute {
userProfile.DisplayName = attr.Values[0]
}
if attr.Name == p.configuration.MailAttribute {
userProfile.Emails = attr.Values
}
if attr.Name == p.configuration.UsernameAttribute {
if len(attr.Values) != 1 {
return nil, fmt.Errorf("user '%s' cannot have multiple value for attribute '%s'",
inputUsername, p.configuration.UsernameAttribute)
}
userProfile.Username = attr.Values[0]
}
}
if userProfile.DN == "" {
return nil, fmt.Errorf("no DN has been found for user %s", inputUsername)
}
return &userProfile, nil
}
func (p *LDAPUserProvider) resolveGroupsFilter(inputUsername string, profile *ldapUserProfile) (filter string, err error) { //nolint:unparam
filter = p.configuration.GroupsFilter
if p.groupsFilterReplacementInput {
// The {input} placeholder is replaced by the users username input.
filter = strings.ReplaceAll(p.configuration.GroupsFilter, ldapPlaceholderInput, p.ldapEscape(inputUsername))
}
if profile != nil {
if p.groupsFilterReplacementUsername {
filter = strings.ReplaceAll(filter, ldapPlaceholderUsername, ldap.EscapeFilter(profile.Username))
}
if p.groupsFilterReplacementDN {
filter = strings.ReplaceAll(filter, ldapPlaceholderDistinguishedName, ldap.EscapeFilter(profile.DN))
}
}
p.log.Tracef("Computed groups filter is %s", filter)
return filter, nil
}
// GetDetails retrieve the groups a user belongs to.
func (p *LDAPUserProvider) GetDetails(inputUsername string) (*UserDetails, error) {
conn, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return nil, err
}
defer conn.Close()
profile, err := p.getUserProfile(conn, inputUsername)
if err != nil {
return nil, err
}
groupsFilter, err := p.resolveGroupsFilter(inputUsername, profile)
if err != nil {
return nil, fmt.Errorf("unable to create group filter for user '%s'. Cause: %w", inputUsername, err)
}
// Search for the given username.
searchGroupRequest := ldap.NewSearchRequest(
p.groupsBaseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
0, 0, false, groupsFilter, p.groupsAttributes, nil,
)
sr, err := conn.Search(searchGroupRequest)
if err != nil {
return nil, fmt.Errorf("unable to retrieve groups of user '%s'. Cause: %w", inputUsername, err)
}
groups := make([]string, 0)
for _, res := range sr.Entries {
if len(res.Attributes) == 0 {
p.log.Warningf("No groups retrieved from LDAP for user %s", inputUsername)
break
}
// Append all values of the document. Normally there should be only one per document.
groups = append(groups, res.Attributes[0].Values...)
}
return &UserDetails{
Username: profile.Username,
DisplayName: profile.DisplayName,
Emails: profile.Emails,
Groups: groups,
}, nil
}
// UpdatePassword update the password of the given user.
func (p *LDAPUserProvider) UpdatePassword(inputUsername string, newPassword string) error {
conn, err := p.connect(p.configuration.User, p.configuration.Password)
if err != nil {
return fmt.Errorf("unable to update password. Cause: %w", err)
}
defer conn.Close()
profile, err := p.getUserProfile(conn, inputUsername)
if err != nil {
return fmt.Errorf("unable to update password. Cause: %w", err)
}
switch {
case p.supportExtensionPasswdModify:
modifyRequest := ldap.NewPasswordModifyRequest(
profile.DN,
"",
newPassword,
)
_, err = conn.PasswordModify(modifyRequest)
case p.configuration.Implementation == schema.LDAPImplementationActiveDirectory:
modifyRequest := ldap.NewModifyRequest(profile.DN, nil)
utf16 := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
// The password needs to be enclosed in quotes
// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/6e803168-f140-4d23-b2d3-c3a8ab5917d2
pwdEncoded, _ := utf16.NewEncoder().String(fmt.Sprintf("\"%s\"", newPassword))
modifyRequest.Replace("unicodePwd", []string{pwdEncoded})
err = conn.Modify(modifyRequest)
default:
modifyRequest := ldap.NewModifyRequest(profile.DN, nil)
modifyRequest.Replace("userPassword", []string{newPassword})
err = conn.Modify(modifyRequest)
}
if err != nil {
return fmt.Errorf("unable to update password. Cause: %w", err)
}
return nil
}