func LoginBind(user, pass string, lc *ldap.LDAPConnection) error {
filterStr := "(&(objectClass=" + UserClass + ")(" + UserClassAttr + "=" + user + "))"
searchReq := ldap.NewSimpleSearchRequest(BaseDomain, 2, filterStr, []string{UserClassAttr})
sr, err := lc.Search(searchReq)
if err != nil {
return err
}
var dnInfo string
if len(sr.Entries) == 1 {
dnInfo = sr.Entries[0].DN
} else {
log.Println("No entries found")
return errors.New("Invalid Credentials")
}
err = lc.Bind(dnInfo, pass)
if err != nil {
log.Println("ERROR : Login not Successful")
return errors.New("Session Expired/Invalid Credentials")
}
return nil
}
func LdapAuthenticator(options *LdapOptions) (martini.Handler, error) {
hostInfo := HostExpr.FindStringSubmatch(options.Host)
config := &ldapConfig{}
switch hostInfo[1] {
case "ldap":
config.SSL = false
case "ldaps":
config.SSL = true
default:
return nil, fmt.Errorf("invalid ldap protocol: %s", hostInfo[1])
}
config.Host = hostInfo[2]
if hostInfo[4] != "" {
port, err := strconv.ParseUint(hostInfo[4], 10, 16)
if err != nil {
return nil, fmt.Errorf("unable to parse ldap port: %s", err)
}
config.Port = uint16(port)
} else {
if config.SSL {
config.Port = 636
} else {
config.Port = 389
}
}
return func(res http.ResponseWriter, req *http.Request, c martini.Context, log *log.Logger) {
// HACK TODO: do not put routing logic in the auth handler
// The /ping endpoint does not have auth, so explicitly exclude it here
if req.URL.Path == "/ping" {
return
}
authHandler := auth.BasicFunc(func(username, password string) bool {
// create the ldap server connection
var conn *ldap.LDAPConnection
if config.SSL {
tlsConfig := tls.Config{
ServerName: config.Host,
}
conn = ldap.NewLDAPSSLConnection(config.Host, config.Port, &tlsConfig)
} else {
conn = ldap.NewLDAPConnection(config.Host, config.Port)
}
// attempt to connect to the ldap server
if err := conn.Connect(); err != nil {
log.Printf("Unable to connect to LDAP: %s", err)
return false
}
// perform an anonymous search for the user's dn so we can attempt to bind as them
req := ldap.SearchRequest{
BaseDN: options.BaseDN,
Filter: fmt.Sprintf(options.UserFilter, ldap.EscapeFilterValue(username)),
Scope: ldap.ScopeWholeSubtree,
}
res, err := conn.Search(&req)
if err != nil {
log.Printf("Error performing LDAP search: %s", err)
return false
}
// Return false if the number of entries isn't exactly 1. If multiple
// results were returned, there is an ambiguity so return false instead
// of proceeding. If no entries were returned, we have no idea who this
// is and cannot authenticate.
if len(res.Entries) != 1 {
if len(res.Entries) > 1 {
log.Printf("User '%s' attempted to authenticate but multiple entries exists", username)
} else {
log.Printf("User '%s' attempted to authenticate but does not exist", username)
}
return false
}
dn := res.Entries[0].DN
if err := conn.Bind(dn, password); err != nil {
log.Printf("User '%s' attempted to authenticate but provided an invalid password", username)
return false
}
log.Printf("Authenticated successfully as %s", username)
return true
})
authenticate := authHandler.(func(http.ResponseWriter, *http.Request, martini.Context))
authenticate(res, req, c)
}, nil
}