Allign login attribute for services

Up to now the builtin lico was using the "username" as the login
attribute, while the proxy (and to some extend the auth-basic) service
tried to uniquely identify users by mail address. This aligns the
default configuration of the services to use the username everywhere.

Fixes: owncloud#4039

services/auth-basic/pkg/config/defaults/defaultconfig.go

@@ -43,7 +43,7 @@ func DefaultConfig() *config.Config {
  GroupBaseDN: "ou=groups,o=libregraph-idm",
  UserScope: "sub",
  GroupScope: "sub",
- LoginAttributes: []string{"uid", "mail"},
+ LoginAttributes: []string{"uid"},
  UserFilter: "",
  GroupFilter: "",
  UserObjectClass: "inetOrgPerson",

services/proxy/pkg/config/defaults/defaultconfig.go

@@ -50,8 +50,8 @@ func DefaultConfig() *config.Config {
  Enabled: true,
  },
  AccountBackend: "cs3",
- UserOIDCClaim: "email",
- UserCS3Claim: "mail",
+ UserOIDCClaim: "preferred_username",
+ UserCS3Claim: "username",
  AutoprovisionAccounts: false,
  EnableBasicAuth: false,
  InsecureBackends: false,