cc-backend/internal/auth/ldap.go

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// Copyright (C) 2023 NHR@FAU, University Erlangen-Nuremberg.
// All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package auth
import (
"errors"
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"fmt"
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"net/http"
"os"
"strings"
"time"
"github.com/ClusterCockpit/cc-backend/internal/config"
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"github.com/ClusterCockpit/cc-backend/internal/repository"
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"github.com/ClusterCockpit/cc-backend/pkg/log"
"github.com/ClusterCockpit/cc-backend/pkg/schema"
"github.com/go-ldap/ldap/v3"
)
type LdapAuthenticator struct {
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syncPassword string
}
var _ Authenticator = (*LdapAuthenticator)(nil)
func (la *LdapAuthenticator) Init() error {
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la.syncPassword = os.Getenv("LDAP_ADMIN_PASSWORD")
if la.syncPassword == "" {
log.Warn("environment variable 'LDAP_ADMIN_PASSWORD' not set (ldap sync will not work)")
}
if config.Keys.LdapConfig.SyncInterval != "" {
interval, err := time.ParseDuration(config.Keys.LdapConfig.SyncInterval)
if err != nil {
log.Warnf("Could not parse duration for sync interval: %v",
config.Keys.LdapConfig.SyncInterval)
return err
}
if interval == 0 {
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log.Info("Sync interval is zero")
return nil
}
go func() {
ticker := time.NewTicker(interval)
for t := range ticker.C {
log.Printf("sync started at %s", t.Format(time.RFC3339))
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if err := la.Sync(); err != nil {
log.Errorf("sync failed: %s", err.Error())
}
log.Print("sync done")
}
}()
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} else {
log.Info("LDAP configuration key sync_interval invalid")
}
return nil
}
func (la *LdapAuthenticator) CanLogin(
user *schema.User,
username string,
rw http.ResponseWriter,
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r *http.Request) (*schema.User, bool) {
lc := config.Keys.LdapConfig
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if user != nil {
if user.AuthSource == schema.AuthViaLDAP {
return user, true
}
} else {
if lc.SyncUserOnLogin {
l, err := la.getLdapConnection(true)
if err != nil {
log.Error("LDAP connection error")
}
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defer l.Close()
// Search for the given username
searchRequest := ldap.NewSearchRequest(
lc.UserBase,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(&%s(uid=%s))", lc.UserFilter, username),
[]string{"dn", "uid", "gecos"}, nil)
sr, err := l.Search(searchRequest)
if err != nil {
log.Warn(err)
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return nil, false
}
if len(sr.Entries) != 1 {
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log.Warn("LDAP: User does not exist or too many entries returned")
return nil, false
}
entry := sr.Entries[0]
name := entry.GetAttributeValue("gecos")
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var roles []string
roles = append(roles, schema.GetRoleString(schema.RoleUser))
projects := make([]string, 0)
user = &schema.User{
Username: username,
Name: name,
Roles: roles,
Projects: projects,
AuthType: schema.AuthSession,
AuthSource: schema.AuthViaLDAP,
}
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if err := repository.GetUserRepository().AddUser(user); err != nil {
log.Errorf("User '%s' LDAP: Insert into DB failed", username)
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return nil, false
}
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return user, true
}
}
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return nil, false
}
func (la *LdapAuthenticator) Login(
user *schema.User,
rw http.ResponseWriter,
r *http.Request) (*schema.User, error) {
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l, err := la.getLdapConnection(false)
if err != nil {
log.Warn("Error while getting ldap connection")
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return nil, err
}
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defer l.Close()
userDn := strings.Replace(config.Keys.LdapConfig.UserBind, "{username}", user.Username, -1)
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if err := l.Bind(userDn, r.FormValue("password")); err != nil {
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log.Errorf("AUTH/LDAP > Authentication for user %s failed: %v",
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user.Username, err)
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return nil, fmt.Errorf("Authentication failed")
}
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return user, nil
}
func (la *LdapAuthenticator) Sync() error {
const IN_DB int = 1
const IN_LDAP int = 2
const IN_BOTH int = 3
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ur := repository.GetUserRepository()
lc := config.Keys.LdapConfig
users := map[string]int{}
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usernames, err := ur.GetLdapUsernames()
if err != nil {
return err
}
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for _, username := range usernames {
users[username] = IN_DB
}
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l, err := la.getLdapConnection(true)
if err != nil {
log.Error("LDAP connection error")
return err
}
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defer l.Close()
ldapResults, err := l.Search(ldap.NewSearchRequest(
lc.UserBase,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
lc.UserFilter,
[]string{"dn", "uid", "gecos"}, nil))
if err != nil {
log.Warn("LDAP search error")
return err
}
newnames := map[string]string{}
for _, entry := range ldapResults.Entries {
username := entry.GetAttributeValue("uid")
if username == "" {
return errors.New("no attribute 'uid'")
}
_, ok := users[username]
if !ok {
users[username] = IN_LDAP
newnames[username] = entry.GetAttributeValue("gecos")
} else {
users[username] = IN_BOTH
}
}
for username, where := range users {
if where == IN_DB && lc.SyncDelOldUsers {
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ur.DelUser(username)
log.Debugf("sync: remove %v (does not show up in LDAP anymore)", username)
} else if where == IN_LDAP {
name := newnames[username]
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var roles []string
roles = append(roles, schema.GetRoleString(schema.RoleUser))
projects := make([]string, 0)
user := &schema.User{
Username: username,
Name: name,
Roles: roles,
Projects: projects,
AuthSource: schema.AuthViaLDAP,
}
log.Debugf("sync: add %v (name: %v, roles: [user], ldap: true)", username, name)
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if err := ur.AddUser(user); err != nil {
log.Errorf("User '%s' LDAP: Insert into DB failed", username)
return err
}
}
}
return nil
}
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// TODO: Add a connection pool or something like
// that so that connections can be reused/cached.
func (la *LdapAuthenticator) getLdapConnection(admin bool) (*ldap.Conn, error) {
lc := config.Keys.LdapConfig
conn, err := ldap.DialURL(lc.Url)
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if err != nil {
log.Warn("LDAP URL dial failed")
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return nil, err
}
if admin {
if err := conn.Bind(lc.SearchDN, la.syncPassword); err != nil {
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conn.Close()
log.Warn("LDAP connection bind failed")
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return nil, err
}
}
return conn, nil
}