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package main
import (
"fmt"
"log"
"os"
"os/signal"
"syscall"
"strings"
"encoding/json"
"encoding/base64"
"math/rand"
consul "github.com/hashicorp/consul/api"
ldap "github.com/vjeantet/ldapserver"
message "github.com/vjeantet/goldap/message"
)
func dnToConsul(dn string) string {
rdns := strings.Split(dn, ",")
// Reverse rdns
for i, j := 0, len(rdns)-1; i < j; i, j = i+1, j-1 {
rdns[i], rdns[j] = rdns[j], rdns[i]
}
return strings.Join(rdns, "/")
}
type DNComponent struct {
Type string
Value string
}
func parseDN(dn string) ([]DNComponent, error) {
rdns := strings.Split(dn, ",")
ret := []DNComponent{}
for _, rdn := range rdns {
splits := strings.Split(rdn, "=")
if len(splits) != 2 {
return nil, fmt.Errorf("Wrong DN component: %s (expected type=value)", rdn)
}
ret = append(ret, DNComponent{
Type: splits[0],
Value: splits[1],
})
}
return ret, nil
}
type Config struct {
Suffix string
}
type Server struct {
config Config
kv *consul.KV
}
type Attributes map[string]interface{}
func main() {
//ldap logger
ldap.Logger = log.New(os.Stdout, "[server] ", log.LstdFlags)
// Connect to Consul
client, err := consul.NewClient(consul.DefaultConfig())
if err != nil {
panic(err)
}
kv := client.KV()
// TODO read config from somewhere
config := Config {
Suffix: "dc=gobottin,dc=eu",
}
gobottin := Server{config: config, kv: kv}
err = gobottin.init()
if err != nil {
panic(err)
}
//Create a new LDAP Server
ldapserver := ldap.NewServer()
routes := ldap.NewRouteMux()
routes.Bind(gobottin.handleBind)
ldapserver.Handle(routes)
// listen on 10389
go ldapserver.ListenAndServe("127.0.0.1:10389")
// When CTRL+C, SIGINT and SIGTERM signal occurs
// Then stop server gracefully
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
<-ch
close(ch)
ldapserver.Stop()
}
func (server *Server) init() error {
pair, _, err := server.kv.Get(dnToConsul(server.config.Suffix) + "/attribute=objectClass", nil)
if err != nil {
return err
}
if pair != nil {
return nil
}
base_attributes := Attributes{
"objectClass": []string{"top", "dcObject", "organization"},
"structuralObjectClass": "Organization",
}
suffix_dn, err := parseDN(server.config.Suffix)
if err != nil {
return err
}
base_attributes[suffix_dn[0].Type] = suffix_dn[0].Value
err = server.addElements(server.config.Suffix, base_attributes)
if err != nil {
return err
}
admin_pass := make([]byte, 8)
rand.Read(admin_pass)
admin_pass_str := base64.RawURLEncoding.EncodeToString(admin_pass)
admin_pass_hash := SSHAEncode([]byte(admin_pass_str))
admin_dn := "cn=admin," + server.config.Suffix
admin_attributes := Attributes{
"objectClass": []string{"simpleSecurityObject", "organizationalRole"},
"description": "LDAP administrator",
"cn": "admin",
"userpassword": admin_pass_hash,
"structuralObjectClass": "organizationalRole",
"permissions": []string{"read", "write"},
}
err = server.addElements(admin_dn, admin_attributes)
if err != nil {
return err
}
log.Printf(
"It seems to be a new installation, we created a default user for you:\n\n dn: %s\n password: %s\n\nWe didn't use true random, you should replace it as soon as possible.",
admin_dn,
admin_pass_str,
)
return nil
}
func (server *Server) addElements(dn string, attrs Attributes) error {
prefix := dnToConsul(dn)
for k, v := range attrs {
json, err := json.Marshal(v)
if err != nil {
return err
}
pair := &consul.KVPair{Key: prefix + "/attribute=" + k, Value: json}
_, err = server.kv.Put(pair, nil)
if err != nil {
return err
}
}
return nil
}
func (server *Server) handleBind(w ldap.ResponseWriter, m *ldap.Message) {
r := m.GetBindRequest()
result_code, err := server.handleBindInternal(w, r)
res := ldap.NewBindResponse(result_code)
if err != nil {
res.SetDiagnosticMessage(err.Error())
log.Printf("Failed bind for %s: %s", string(r.Name()), err.Error())
}
w.Write(res)
}
func (server *Server) handleBindInternal(w ldap.ResponseWriter, r message.BindRequest) (int, error) {
pair, _, err := server.kv.Get(dnToConsul(string(r.Name())) + "/attribute=userpassword", nil)
if err != nil {
return ldap.LDAPResultOperationsError, err
}
if pair == nil {
return ldap.LDAPResultNoSuchObject, nil
}
hash := ""
err = json.Unmarshal(pair.Value, &hash)
if err != nil {
return ldap.LDAPResultOperationsError, err
}
valid := SSHAMatches(hash, []byte(r.AuthenticationSimple()))
if valid {
return ldap.LDAPResultSuccess, nil
} else {
return ldap.LDAPResultInvalidCredentials, nil
}
}
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