# Additional Second Factors

Starting with version 2.0.6, LemonLDAP::NG lets you configure multiple instances of second factor authentication modules, in a manner similar to the Combination module.

Only the following Second Factor modules are compatible with this feature:

- E-Mail
- External
- REST

Using this option, lets you give your users a wider range of possible second factors. They could decide between using their work email or home email. And as an administrator you may now plug in more than one Second Factor solution through REST or external commands.

## Configuration

You can find the configuration for this feature in `General parameters` » `Second factors` » `Additional second factors`

- `Name`: the technical name of this second factor, it should be all lowercase, and it is used as a sort key when second factors are displayed to the user
- `Type`: what type of second factor you want to use
- `Rule`: If you leave this field empty, this second factor will always be enabled. You may use a perl expression to decide when this second factor is available.
  - `$homeMail` : this second factor will only trigger if the `$homeMail` session key exists
  - `defined $hGroups{'admin'}` : this second factor will only trigger if the user is in the `admin` group

After adding your second factors, don't forget to add overload parameters to them. You usually should at least give them different logos so that the user can tell the difference between two second factors of the same type.

See the parameters list page for a full list of parameters you may overload. Here are the most useful ones:

- E-Mail
  - `mail2fLogo`
  - `mailSessionKey`
  - `mail2fCodeRegex`
  - `mail2fSubject`
  - `mail2fBody`
- External
  - `ext2fLogo`
  - `ext2fCodeActivation`
  - `ext2FSendCommand`
  - `ext2FValidateCommand`
- REST
  - `rest2fLogo`
  - `rest2fVerifyUrl`
  - `rest2fVerifyArgs` (must be a JSON object)
  - `rest2fInitUrl`
  - `rest2fInitArgs` (must be a JSON object)