forgejo/modules/auth/ldap/ldap.go
Girish Ramakrishnan 24d7a86a8d Set IsAdmin using LDAP
The IsAdmin flag is set based on whether the admin filter
returned any result. The admin filter is applied with the user dn
as the search root.

In the future, we should update IsAdmin as well on each login.
Alternately, we can have a periodic sync operation.
2015-08-18 23:49:12 -07:00

149 lines
4.5 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// Package ldap provide functions & structure to query a LDAP ldap directory
// For now, it's mainly tested again an MS Active Directory service, see README.md for more information
package ldap
import (
"fmt"
"github.com/gogits/gogs/modules/ldap"
"github.com/gogits/gogs/modules/log"
)
// Basic LDAP authentication service
type Ldapsource struct {
Name string // canonical name (ie. corporate.ad)
Host string // LDAP host
Port int // port number
UseSSL bool // Use SSL
BindDN string // DN to bind with
BindPassword string // Bind DN password
UserBase string // Base search path for users
AttributeName string // First name attribute
AttributeSurname string // Surname attribute
AttributeMail string // E-mail attribute
Filter string // Query filter to validate entry
AdminFilter string // Query filter to check if user is admin
Enabled bool // if this source is disabled
}
func (ls Ldapsource) FindUserDN(name string) (string, bool) {
l, err := ldapDial(ls)
if err != nil {
log.Error(4, "LDAP Connect error, %s:%v", ls.Host, err)
ls.Enabled = false
return "", false
}
defer l.Close()
log.Trace("Search for LDAP user: %s", name)
if ls.BindDN != "" && ls.BindPassword != "" {
err = l.Bind(ls.BindDN, ls.BindPassword)
if err != nil {
log.Debug("Failed to bind as BindDN[%s]: %v", ls.BindDN, err)
return "", false
}
log.Trace("Bound as BindDN %s", ls.BindDN)
} else {
log.Trace("Proceeding with anonymous LDAP search.")
}
// A search for the user.
userFilter := fmt.Sprintf(ls.Filter, name)
log.Trace("Searching using filter %s", userFilter)
search := ldap.NewSearchRequest(
ls.UserBase, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0,
false, userFilter, []string{}, nil)
// Ensure we found a user
sr, err := l.Search(search)
if err != nil || len(sr.Entries) < 1 {
log.Debug("Failed search using filter[%s]: %v", userFilter, err)
return "", false
} else if len(sr.Entries) > 1 {
log.Debug("Filter '%s' returned more than one user.", userFilter)
return "", false
}
userDN := sr.Entries[0].DN
if userDN == "" {
log.Error(4, "LDAP search was succesful, but found no DN!")
return "", false
}
return userDN, true
}
// searchEntry : search an LDAP source if an entry (name, passwd) is valid and in the specific filter
func (ls Ldapsource) SearchEntry(name, passwd string) (string, string, string, bool, bool) {
userDN, found := ls.FindUserDN(name)
if !found {
return "", "", "", false, false
}
l, err := ldapDial(ls)
if err != nil {
log.Error(4, "LDAP Connect error, %s:%v", ls.Host, err)
ls.Enabled = false
return "", "", "", false, false
}
defer l.Close()
log.Trace("Binding with userDN: %s", userDN)
err = l.Bind(userDN, passwd)
if err != nil {
log.Debug("LDAP auth. failed for %s, reason: %v", userDN, err)
return "", "", "", false, false
}
log.Trace("Bound successfully with userDN: %s", userDN)
userFilter := fmt.Sprintf(ls.Filter, name)
search := ldap.NewSearchRequest(
userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, userFilter,
[]string{ls.AttributeName, ls.AttributeSurname, ls.AttributeMail},
nil)
sr, err := l.Search(search)
if err != nil {
log.Error(4, "LDAP Search failed unexpectedly! (%v)", err)
return "", "", "", false, false
} else if len(sr.Entries) < 1 {
log.Error(4, "LDAP Search failed unexpectedly! (0 entries)")
return "", "", "", false, false
}
name_attr := sr.Entries[0].GetAttributeValue(ls.AttributeName)
sn_attr := sr.Entries[0].GetAttributeValue(ls.AttributeSurname)
mail_attr := sr.Entries[0].GetAttributeValue(ls.AttributeMail)
search = ldap.NewSearchRequest(
userDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, ls.AdminFilter,
[]string{ls.AttributeName},
nil)
sr, err = l.Search(search)
admin_attr := false
if err != nil {
log.Error(4, "LDAP Admin Search failed unexpectedly! (%v)", err)
} else if len(sr.Entries) < 1 {
log.Error(4, "LDAP Admin Search failed")
} else {
admin_attr = true
}
return name_attr, sn_attr, mail_attr, admin_attr, true
}
func ldapDial(ls Ldapsource) (*ldap.Conn, error) {
if ls.UseSSL {
log.Debug("Using TLS for LDAP")
return ldap.DialTLS("tcp", fmt.Sprintf("%s:%d", ls.Host, ls.Port), nil)
} else {
return ldap.Dial("tcp", fmt.Sprintf("%s:%d", ls.Host, ls.Port))
}
}