466 lines
13 KiB
Go
466 lines
13 KiB
Go
package authentication
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import (
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"crypto/tls"
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"crypto/x509"
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"fmt"
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"net"
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"strings"
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"github.com/go-ldap/ldap/v3"
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"github.com/sirupsen/logrus"
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"github.com/authelia/authelia/v4/internal/configuration/schema"
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"github.com/authelia/authelia/v4/internal/logging"
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"github.com/authelia/authelia/v4/internal/utils"
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)
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// LDAPUserProvider is a UserProvider that connects to LDAP servers like ActiveDirectory, OpenLDAP, OpenDJ, FreeIPA, etc.
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type LDAPUserProvider struct {
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config schema.LDAPAuthenticationBackendConfiguration
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tlsConfig *tls.Config
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dialOpts []ldap.DialOpt
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log *logrus.Logger
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factory LDAPConnectionFactory
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disableResetPassword bool
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// Automatically detected ldap features.
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supportExtensionPasswdModify bool
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// Dynamically generated users values.
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usersBaseDN string
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usersAttributes []string
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usersFilterReplacementInput bool
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// Dynamically generated groups values.
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groupsBaseDN string
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groupsAttributes []string
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groupsFilterReplacementInput bool
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groupsFilterReplacementUsername bool
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groupsFilterReplacementDN bool
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}
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// NewLDAPUserProvider creates a new instance of LDAPUserProvider.
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func NewLDAPUserProvider(config schema.AuthenticationBackendConfiguration, certPool *x509.CertPool) (provider *LDAPUserProvider) {
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provider = newLDAPUserProvider(*config.LDAP, config.DisableResetPassword, certPool, nil)
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return provider
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}
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func newLDAPUserProvider(config schema.LDAPAuthenticationBackendConfiguration, disableResetPassword bool, certPool *x509.CertPool, factory LDAPConnectionFactory) (provider *LDAPUserProvider) {
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if config.TLS == nil {
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config.TLS = schema.DefaultLDAPAuthenticationBackendConfiguration.TLS
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}
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tlsConfig := utils.NewTLSConfig(config.TLS, tls.VersionTLS12, certPool)
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var dialOpts = []ldap.DialOpt{
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ldap.DialWithDialer(&net.Dialer{Timeout: config.Timeout}),
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}
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if tlsConfig != nil {
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dialOpts = append(dialOpts, ldap.DialWithTLSConfig(tlsConfig))
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}
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if factory == nil {
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factory = NewProductionLDAPConnectionFactory()
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}
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provider = &LDAPUserProvider{
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config: config,
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tlsConfig: tlsConfig,
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dialOpts: dialOpts,
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log: logging.Logger(),
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factory: factory,
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disableResetPassword: disableResetPassword,
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}
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provider.parseDynamicUsersConfiguration()
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provider.parseDynamicGroupsConfiguration()
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return provider
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}
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// CheckUserPassword checks if provided password matches for the given user.
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func (p *LDAPUserProvider) CheckUserPassword(inputUsername string, password string) (valid bool, err error) {
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var (
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conn, connUser LDAPConnection
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profile *ldapUserProfile
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)
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if conn, err = p.connect(); err != nil {
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return false, err
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}
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defer conn.Close()
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if profile, err = p.getUserProfile(conn, inputUsername); err != nil {
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return false, err
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}
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if connUser, err = p.connectCustom(p.config.URL, profile.DN, password, p.config.StartTLS, p.dialOpts...); err != nil {
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return false, fmt.Errorf("authentication failed. Cause: %w", err)
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}
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defer connUser.Close()
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return true, nil
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}
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// GetDetails retrieve the groups a user belongs to.
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func (p *LDAPUserProvider) GetDetails(username string) (details *UserDetails, err error) {
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var (
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conn LDAPConnection
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profile *ldapUserProfile
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)
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if conn, err = p.connect(); err != nil {
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return nil, err
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}
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defer conn.Close()
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if profile, err = p.getUserProfile(conn, username); err != nil {
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return nil, err
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}
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var (
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filter string
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searchRequest *ldap.SearchRequest
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searchResult *ldap.SearchResult
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)
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if filter, err = p.resolveGroupsFilter(username, profile); err != nil {
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return nil, fmt.Errorf("unable to create group filter for user '%s'. Cause: %w", username, err)
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}
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// Search for the users groups.
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searchRequest = ldap.NewSearchRequest(
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p.groupsBaseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
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0, 0, false, filter, p.groupsAttributes, nil,
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)
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if searchResult, err = p.search(conn, searchRequest); err != nil {
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return nil, fmt.Errorf("unable to retrieve groups of user '%s'. Cause: %w", username, err)
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}
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groups := make([]string, 0)
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for _, res := range searchResult.Entries {
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if len(res.Attributes) == 0 {
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p.log.Warningf("No groups retrieved from LDAP for user %s", username)
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break
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}
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// Append all values of the document. Normally there should be only one per document.
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groups = append(groups, res.Attributes[0].Values...)
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}
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return &UserDetails{
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Username: profile.Username,
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DisplayName: profile.DisplayName,
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Emails: profile.Emails,
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Groups: groups,
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}, nil
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}
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// UpdatePassword update the password of the given user.
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func (p *LDAPUserProvider) UpdatePassword(username, password string) (err error) {
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var (
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conn LDAPConnection
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profile *ldapUserProfile
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)
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if conn, err = p.connect(); err != nil {
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return fmt.Errorf("unable to update password. Cause: %w", err)
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}
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defer conn.Close()
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if profile, err = p.getUserProfile(conn, username); err != nil {
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return fmt.Errorf("unable to update password. Cause: %w", err)
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}
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var controls []ldap.Control
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switch {
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case p.supportExtensionPasswdModify:
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pwdModifyRequest := ldap.NewPasswordModifyRequest(
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profile.DN,
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"",
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password,
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)
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err = p.pwdModify(conn, pwdModifyRequest)
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case p.config.Implementation == schema.LDAPImplementationActiveDirectory:
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modifyRequest := ldap.NewModifyRequest(profile.DN, controls)
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// The password needs to be enclosed in quotes
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// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-adts/6e803168-f140-4d23-b2d3-c3a8ab5917d2
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pwdEncoded, _ := utf16LittleEndian.NewEncoder().String(fmt.Sprintf("\"%s\"", password))
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modifyRequest.Replace(ldapAttributeUnicodePwd, []string{pwdEncoded})
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err = p.modify(conn, modifyRequest)
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default:
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modifyRequest := ldap.NewModifyRequest(profile.DN, controls)
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modifyRequest.Replace(ldapAttributeUserPassword, []string{password})
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err = p.modify(conn, modifyRequest)
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}
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if err != nil {
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return fmt.Errorf("unable to update password. Cause: %w", err)
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}
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return nil
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}
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func (p *LDAPUserProvider) connect() (LDAPConnection, error) {
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return p.connectCustom(p.config.URL, p.config.User, p.config.Password, p.config.StartTLS, p.dialOpts...)
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}
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func (p *LDAPUserProvider) connectCustom(url, userDN, password string, startTLS bool, opts ...ldap.DialOpt) (conn LDAPConnection, err error) {
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if conn, err = p.factory.DialURL(url, opts...); err != nil {
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return nil, fmt.Errorf("dial failed with error: %w", err)
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}
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if startTLS {
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if err = conn.StartTLS(p.tlsConfig); err != nil {
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return nil, fmt.Errorf("starttls failed with error: %w", err)
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}
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}
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if err = conn.Bind(userDN, password); err != nil {
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return nil, fmt.Errorf("bind failed with error: %w", err)
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}
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return conn, nil
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}
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func (p *LDAPUserProvider) search(conn LDAPConnection, searchRequest *ldap.SearchRequest) (searchResult *ldap.SearchResult, err error) {
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searchResult, err = conn.Search(searchRequest)
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if err != nil {
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if referral, ok := p.getReferral(err); ok {
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if errReferral := p.searchReferral(referral, searchRequest, searchResult); errReferral != nil {
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return nil, err
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}
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return searchResult, nil
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}
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return nil, err
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}
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if !p.config.PermitReferrals || len(searchResult.Referrals) == 0 {
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return searchResult, nil
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}
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p.searchReferrals(searchRequest, searchResult)
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return searchResult, nil
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}
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func (p *LDAPUserProvider) searchReferral(referral string, searchRequest *ldap.SearchRequest, searchResult *ldap.SearchResult) (err error) {
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var (
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conn LDAPConnection
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result *ldap.SearchResult
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)
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if conn, err = p.connectCustom(referral, p.config.User, p.config.Password, p.config.StartTLS, p.dialOpts...); err != nil {
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p.log.Errorf("Failed to connect during referred search request (referred to %s): %v", referral, err)
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return err
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}
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defer conn.Close()
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if result, err = conn.Search(searchRequest); err != nil {
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p.log.Errorf("Failed to perform search operation during referred search request (referred to %s): %v", referral, err)
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return err
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}
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if len(result.Entries) == 0 {
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return err
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}
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for i := 0; i < len(result.Entries); i++ {
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if !ldapEntriesContainsEntry(result.Entries[i], searchResult.Entries) {
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searchResult.Entries = append(searchResult.Entries, result.Entries[i])
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}
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}
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return nil
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}
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func (p *LDAPUserProvider) searchReferrals(searchRequest *ldap.SearchRequest, searchResult *ldap.SearchResult) {
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for i := 0; i < len(searchResult.Referrals); i++ {
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_ = p.searchReferral(searchResult.Referrals[i], searchRequest, searchResult)
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}
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}
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func (p *LDAPUserProvider) getUserProfile(conn LDAPConnection, inputUsername string) (profile *ldapUserProfile, err error) {
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userFilter := p.resolveUsersFilter(inputUsername)
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// Search for the given username.
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searchRequest := ldap.NewSearchRequest(
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p.usersBaseDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases,
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1, 0, false, userFilter, p.usersAttributes, nil,
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)
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var searchResult *ldap.SearchResult
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if searchResult, err = p.search(conn, searchRequest); err != nil {
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return nil, fmt.Errorf("cannot find user DN of user '%s'. Cause: %w", inputUsername, err)
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}
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if len(searchResult.Entries) == 0 {
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return nil, ErrUserNotFound
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}
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if len(searchResult.Entries) > 1 {
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return nil, fmt.Errorf("multiple users %s found", inputUsername)
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}
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userProfile := ldapUserProfile{
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DN: searchResult.Entries[0].DN,
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}
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for _, attr := range searchResult.Entries[0].Attributes {
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if attr.Name == p.config.DisplayNameAttribute {
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userProfile.DisplayName = attr.Values[0]
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}
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if attr.Name == p.config.MailAttribute {
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userProfile.Emails = attr.Values
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}
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if attr.Name == p.config.UsernameAttribute {
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if len(attr.Values) != 1 {
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return nil, fmt.Errorf("user '%s' cannot have multiple value for attribute '%s'",
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inputUsername, p.config.UsernameAttribute)
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}
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userProfile.Username = attr.Values[0]
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}
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}
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if userProfile.DN == "" {
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return nil, fmt.Errorf("no DN has been found for user %s", inputUsername)
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}
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return &userProfile, nil
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}
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func (p *LDAPUserProvider) resolveUsersFilter(inputUsername string) (filter string) {
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filter = p.config.UsersFilter
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if p.usersFilterReplacementInput {
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// The {input} placeholder is replaced by the username input.
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filter = strings.ReplaceAll(filter, ldapPlaceholderInput, ldapEscape(inputUsername))
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}
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p.log.Tracef("Detected user filter is %s", filter)
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return filter
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}
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func (p *LDAPUserProvider) resolveGroupsFilter(inputUsername string, profile *ldapUserProfile) (filter string, err error) { //nolint:unparam
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filter = p.config.GroupsFilter
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if p.groupsFilterReplacementInput {
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// The {input} placeholder is replaced by the users username input.
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filter = strings.ReplaceAll(p.config.GroupsFilter, ldapPlaceholderInput, ldapEscape(inputUsername))
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}
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if profile != nil {
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if p.groupsFilterReplacementUsername {
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filter = strings.ReplaceAll(filter, ldapPlaceholderUsername, ldap.EscapeFilter(profile.Username))
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}
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if p.groupsFilterReplacementDN {
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filter = strings.ReplaceAll(filter, ldapPlaceholderDistinguishedName, ldap.EscapeFilter(profile.DN))
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}
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}
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p.log.Tracef("Computed groups filter is %s", filter)
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return filter, nil
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}
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func (p *LDAPUserProvider) modify(conn LDAPConnection, modifyRequest *ldap.ModifyRequest) (err error) {
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if err = conn.Modify(modifyRequest); err != nil {
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var (
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referral string
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ok bool
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)
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if referral, ok = p.getReferral(err); !ok {
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return err
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}
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p.log.Debugf("Attempting Modify on referred URL %s", referral)
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var (
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connReferral LDAPConnection
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errReferral error
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)
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if connReferral, errReferral = p.connectCustom(referral, p.config.User, p.config.Password, p.config.StartTLS, p.dialOpts...); errReferral != nil {
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p.log.Errorf("Failed to connect during referred modify request (referred to %s): %v", referral, errReferral)
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return err
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}
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defer connReferral.Close()
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if errReferral = connReferral.Modify(modifyRequest); errReferral != nil {
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p.log.Errorf("Failed to perform modify operation during referred modify request (referred to %s): %v", referral, errReferral)
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}
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}
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return err
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}
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func (p *LDAPUserProvider) pwdModify(conn LDAPConnection, pwdModifyRequest *ldap.PasswordModifyRequest) (err error) {
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if _, err = conn.PasswordModify(pwdModifyRequest); err != nil {
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var (
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referral string
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ok bool
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)
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if referral, ok = p.getReferral(err); !ok {
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return err
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}
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p.log.Debugf("Attempting PwdModify ExOp (1.3.6.1.4.1.4203.1.11.1) on referred URL %s", referral)
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var (
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connReferral LDAPConnection
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errReferral error
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)
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if connReferral, errReferral = p.connectCustom(referral, p.config.User, p.config.Password, p.config.StartTLS, p.dialOpts...); errReferral != nil {
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p.log.Errorf("Failed to connect during referred password modify request (referred to %s): %v", referral, errReferral)
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return err
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}
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defer connReferral.Close()
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if _, errReferral = connReferral.PasswordModify(pwdModifyRequest); errReferral != nil {
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p.log.Errorf("Failed to perform modify operation during referred modify request (referred to %s): %v", referral, errReferral)
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}
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}
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return err
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}
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func (p *LDAPUserProvider) getReferral(err error) (referral string, ok bool) {
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if !p.config.PermitReferrals {
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return "", false
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}
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return ldapGetReferral(err)
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}
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