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ldapwrap.go
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ldapwrap.go
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package ldapwrap
import (
"context"
"errors"
"fmt"
"strconv"
"sync"
"time"
"gopkg.in/ldap.v3"
"github.com/b4ckspace/members/internal/core"
"github.com/b4ckspace/members/internal/ssha"
)
type (
LdapDialer struct {
connFactory LdapConnFactory
}
LdapWrap struct {
conn core.LdapConn
m sync.Mutex
}
Token struct {
ValidUntil time.Time
Nickname string
Random []byte
}
)
func EscapeFilter(f string) string {
return ldap.EscapeFilter(f)
}
func New(cf LdapConnFactory) (l core.LdapDialer, err error) {
return &LdapDialer{
connFactory: cf,
}, err
}
func (ld *LdapDialer) Dial(ctx context.Context) (core.LdapWrap, error) {
c, err := ld.connFactory()
if err != nil {
return nil, fmt.Errorf("unable to connect: %s", err)
}
go func() {
<-ctx.Done()
c.Close()
}()
return &LdapWrap{
conn: c,
}, nil
}
func (l *LdapWrap) NextUidNumber() (nextUidNumber int, err error) {
l.m.Lock()
defer l.m.Unlock()
res, err := l.SearchActiveAndInactive("(objectClass=backspaceMember)", []string{"uidNumber"})
if err != nil {
return 0, fmt.Errorf("unable to query for new uid: %s", err)
}
for _, member := range res.Entries {
for _, attr := range member.Attributes {
if attr.Name == "uidNumber" {
if len(attr.Values) == 1 {
uidNumber, err := strconv.Atoi(attr.Values[0])
if err != nil {
continue
}
if uidNumber > nextUidNumber {
nextUidNumber = uidNumber
}
}
}
}
}
nextUidNumber++
return
}
func (l *LdapWrap) PasswordReset(nickname string) (token, email string, err error) {
nickname = ldap.EscapeFilter(nickname)
search := fmt.Sprintf("(&(objectClass=backspaceMember)(uid=%s))", nickname)
sr, err := l.SearchActive(search, []string{"alternateEmail"})
if err != nil {
return "", "", fmt.Errorf("unable to find member: %s", err)
}
if len(sr.Entries) != 1 {
return "", "", fmt.Errorf("unable to find user with nickname: %s", nickname)
}
token, err = GenerateToken(nickname)
if err != nil {
return "", "", fmt.Errorf("unable to generate token: %s", err)
}
member := sr.Entries[0]
email = member.GetAttributeValue("alternateEmail")
req := ldap.NewModifyRequest(member.DN, []ldap.Control{})
req.Replace("token", []string{token})
err = l.conn.Modify(req)
if err != nil {
return "", "", fmt.Errorf("unable to set token: %s", err)
}
return token, email, nil
}
func (l *LdapWrap) RegisterMember(user, email, mlEmail string) (token string, err error) {
exists, err := l.MemberExists(user)
if err != nil {
return "", fmt.Errorf("unable to check if user exists: %s", err)
}
if exists {
return "", fmt.Errorf("unable to add user: user %s exists", user)
}
uidNumber, err := l.NextUidNumber()
if err != nil {
return "", err
}
token, err = GenerateToken(user)
if err != nil {
return "", fmt.Errorf("unable to generate token: %s", err)
}
intEmail := fmt.Sprintf("%s@hackerspace-bamberg.de", user)
dn := fmt.Sprintf("uid=%s,ou=inactiveMember,dc=backspace", user)
req := ldap.NewAddRequest(dn, []ldap.Control{})
req.Attribute("objectClass", []string{"backspaceMember"})
req.Attribute("uid", []string{user})
req.Attribute("uidNumber", []string{fmt.Sprintf("%d", uidNumber)})
req.Attribute("gidNumber", []string{"1212"})
req.Attribute("email", []string{intEmail})
req.Attribute("alternateEmail", []string{email})
req.Attribute("mlAddress", []string{mlEmail})
req.Attribute("serviceEnabled", []string{"htaccess", "mail", "redmine"})
req.Attribute("token", []string{token})
req.Attribute("userPassword", []string{"-"})
req.Attribute("doorPassword", []string{"-"})
err = l.conn.Add(req)
if err != nil {
return "", fmt.Errorf("unable to add user: %s", err)
}
return token, nil
}
func (l *LdapWrap) SetPassword(token, password, doorpass string) (err error) {
passwordHash, err := ssha.Hash(password, ssha.SSHA)
if err != nil {
return fmt.Errorf("unable to hash password: %s", err)
}
doorpassHash, err := ssha.Hash(doorpass, ssha.SSHA512)
if err != nil {
return fmt.Errorf("unable to hash door password: %s", err)
}
token = ldap.EscapeFilter(token)
search := fmt.Sprintf("(&(objectClass=backspaceMember)(token=%s))", token)
sr, err := l.SearchActiveAndInactive(search, []string{})
if err != nil {
return fmt.Errorf("unable to search: %s", err)
}
if len(sr.Entries) != 1 {
fmt.Println(search)
return errors.New("no user with that token found")
}
member := sr.Entries[0]
ok, err := ValidateToken(token, member.GetAttributeValue("uid"))
if !ok || err != nil {
return fmt.Errorf("invalid token: %s", err)
}
req := ldap.NewModifyRequest(member.DN, []ldap.Control{})
req.Replace("userPassword", []string{passwordHash})
req.Replace("doorPassword", []string{doorpassHash})
req.Replace("token", []string{"**invalidated**"})
err = l.conn.Modify(req)
if err != nil {
return fmt.Errorf("unable to set password: %s", err)
}
return nil
}
func (l *LdapWrap) MemberExists(uid string) (exists bool, err error) {
filter := fmt.Sprintf("(&(objectClass=backspaceMember)(uid=%s))", EscapeFilter(uid))
res, err := l.SearchActiveAndInactive(filter, []string{})
if err != nil {
return false, fmt.Errorf("unable to search: %s", err)
}
if len(res.Entries) > 0 {
return true, nil
}
return
}
func (l *LdapWrap) SearchActive(filter string, attrs []string) (sr *ldap.SearchResult, err error) {
r := ldap.NewSearchRequest(
"ou=member,dc=backspace",
ldap.ScopeWholeSubtree,
ldap.NeverDerefAliases,
0, 0, false,
filter,
attrs,
[]ldap.Control{},
)
return l.conn.Search(r)
}
func (l *LdapWrap) SearchInactive(filter string, attrs []string) (sr *ldap.SearchResult, err error) {
r := ldap.NewSearchRequest(
"ou=inactiveMember,dc=backspace",
ldap.ScopeWholeSubtree,
ldap.NeverDerefAliases,
0, 0, false,
filter,
attrs,
[]ldap.Control{},
)
return l.conn.Search(r)
}
func (l *LdapWrap) SearchActiveAndInactive(filter string, attrs []string) (sr *ldap.SearchResult, err error) {
sr1, err := l.SearchActive(filter, attrs)
if err != nil {
return
}
sr2, err := l.SearchInactive(filter, attrs)
if err != nil {
return
}
return &ldap.SearchResult{
Entries: append(sr1.Entries, sr2.Entries...),
Referrals: append(sr1.Referrals, sr2.Referrals...),
Controls: append(sr1.Controls, sr2.Controls...),
}, err
}