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ldap.go
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ldap.go
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package main
import (
"crypto/tls"
"errors"
"fmt"
"log"
"net/http"
"strconv"
"strings"
"github.com/go-chi/render"
"gopkg.in/ldap.v2"
)
type ldapConn struct {
Base string
Server string
Port string
BindDN string
BindPassword string
}
// LDAPUser def
type LDAPUser struct {
Username string
DisplayName string
Admin bool
}
// LDAPAuthCheck desc
type LDAPAuthCheck struct {
authorized bool
exists bool
}
// LDAPGroup API response
type LDAPGroup struct {
LDAPGroupName string `json:"ldap_group_name"`
}
func (s *server) GetUserLDAPGroups(w http.ResponseWriter, r *http.Request) {
var LDAPUser, err = s.getLDAPUser(r)
// Check ldap user
if !LDAPUser.Admin || err != nil {
render.Status(r, 403)
render.JSON(w, r, nil)
return
}
// Chech matching LDAP group exits and user has access
LDAPGroups, err := s.lc.GetUserLDAPGroups(LDAPUser.Username)
if err != nil {
log.Printf("Error with LDAP backend: %s", LDAPGroups)
render.Status(r, 500)
render.JSON(w, r, nil)
return
}
if err != nil {
// handle this error better than this
log.Printf("ERROR: handling DB rows: %+v", err)
render.Status(r, 500)
render.JSON(w, r, nil)
return
}
render.JSON(w, r, LDAPGroups)
return
}
// CheckLDAPGroup
func (lc *ldapConn) GetUserLDAPGroups(username string) ([]LDAPGroup, error) {
port, err := strconv.Atoi(lc.Port)
if err != nil {
return nil, errors.New("Error reading ldap port")
}
l, err := ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", lc.Server, port), &tls.Config{InsecureSkipVerify: true})
if err != nil {
return nil, err
}
defer l.Close()
// First bind with a read only user
err = l.Bind(lc.BindDN, lc.BindPassword)
if err != nil {
return nil, err
}
// Search for the given username and get all groups
searchRequest := ldap.NewSearchRequest(
lc.Base,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(&(uid=%s)(objectClass=posixaccount))", username),
[]string{"dn", "memberOf", "displayName"},
nil,
)
sr, err := l.Search(searchRequest)
if err != nil {
return nil, err
}
var lg []LDAPGroup
for _, v := range sr.Entries[0].Attributes {
switch v.Name {
case "memberOf":
for _, v := range v.Values {
lg = append(lg, LDAPGroup{LDAPGroupName: strings.Split(strings.Split(v, ",")[0], "cn=")[1]})
}
break
}
}
return lg, err
}
// CheckLDAPGroup
func (lc *ldapConn) CheckLDAPGroup(groupName string, username string) (*LDAPAuthCheck, error) {
lcheck := LDAPAuthCheck{
authorized: false,
exists: false,
}
port, err := strconv.Atoi(lc.Port)
if err != nil {
return &lcheck, errors.New("Error reading ldap port")
}
l, err := ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", lc.Server, port), &tls.Config{InsecureSkipVerify: true})
if err != nil {
return &lcheck, err
}
defer l.Close()
// First bind with a read only user
err = l.Bind(lc.BindDN, lc.BindPassword)
if err != nil {
return &lcheck, err
}
// Search for the given groupName
existsRequest := ldap.NewSearchRequest(
lc.Base,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(&(uid=%s)(objectClass=posixGroup))", groupName), // The filter to apply
[]string{"dn", "cn"}, // A list attributes to retrieve
nil,
)
er, err := l.Search(existsRequest)
if err != nil {
return &lcheck, err
}
if len(er.Entries) != 1 {
return &lcheck, nil
}
// Set exists true
lcheck.exists = true
// Search for the given username and get all groups
accessRequest := ldap.NewSearchRequest(
lc.Base,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(&(uid=%s)(objectClass=posixaccount))", username),
[]string{"dn", "memberOf", "displayName"},
nil,
)
ar, err := l.Search(accessRequest)
if len(ar.Entries) != 1 {
return &lcheck, nil
}
for _, v := range ar.Entries[0].Attributes {
switch v.Name {
case "memberOf":
for _, v := range v.Values {
if v == fmt.Sprintf("cn=%s,cn=groups,cn=accounts,dc=pasientsky,dc=no", groupName) {
lcheck.authorized = true
}
}
break
}
}
return &lcheck, nil
}
func (lc *ldapConn) LDAPAuthentication(a Auth) (LDAPUser, error) {
u := LDAPUser{
Username: a.Username,
Admin: false,
}
password := a.Password
port, err := strconv.Atoi(lc.Port)
if err != nil {
return LDAPUser{}, errors.New("Error reading ldap port")
}
l, err := ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", lc.Server, port), &tls.Config{InsecureSkipVerify: true})
if err != nil {
return LDAPUser{}, err
}
defer l.Close()
// First bind with a read only user
err = l.Bind(lc.BindDN, lc.BindPassword)
if err != nil {
return LDAPUser{}, err
}
// Search for the given username
searchRequest := ldap.NewSearchRequest(
lc.Base,
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(&(uid=%s)(objectClass=posixaccount))", u.Username),
[]string{"dn", "memberOf", "displayName"},
nil,
)
sr, err := l.Search(searchRequest)
if err != nil {
return LDAPUser{}, err
}
if len(sr.Entries) != 1 {
return LDAPUser{}, errors.New("User does not exist or too many entries returned")
}
accessAllowed := false
for _, v := range sr.Entries[0].Attributes {
switch v.Name {
case "memberOf":
for _, v := range v.Values {
if v == "cn=admins,cn=groups,cn=accounts,dc=pasientsky,dc=no" || v == "cn=otu-superheroes,cn=groups,cn=accounts,dc=pasientsky,dc=no" {
u.Admin = true
accessAllowed = true
}
if v == "cn=otu,cn=groups,cn=accounts,dc=pasientsky,dc=no" {
accessAllowed = true
}
}
break
case "displayName":
u.DisplayName = v.Values[0]
break
}
}
if err := l.Bind(sr.Entries[0].DN, password); err != nil {
return LDAPUser{}, errors.New("Failed to auth: " + u.Username)
}
if !accessAllowed {
return LDAPUser{}, errors.New("Not allowed OTU: " + u.Username)
}
fmt.Printf("Authenticated successfuly as %s!\n", u.Username)
return u, nil
}