# Migrating to LDAP or SAML

Thinking about changing how your users log in to Overleaf Server Pro? You're in the right place! This guide is for you if you're currently using our native username and password login and want to switch to an external one like LDAP/Active Directory or SAML 2.0. It also covers how to switch back if you ever need to.

We’ll use LDAP in our examples, but don't worry—the process is exactly the same if you're using SAML. Let's dive in!

## Switching from native authentication

Let's imagine you've been running Server Pro for a while or have recently upgraded from the Community Edition. You have user, Alice, who logs in with their email, `alice@example.com`, and a password they created in Overleaf. Behind the scenes, their Overleaf accounts look something like this:

```
# Alice
{
  _id:        '123',
  email:      'alice@example.com'
  first_name: 'Alice',
  last_name:  'Jones'
}
```

Now, you want to integrate with your company's LDAP/Active Directory system. In that system, Alice's details are:

```
Alice:
  - uid:  'alicejones'
  - mail: 'alicejones@tech.example.com'
  - givenName:   'Alice'
  - sn: 'Jones'
```

Your goal is to have Alice log in with their LDAP username (`alicejones`) and password instead of their old Overleaf credentials, without losing any of their work. Here’s how to make that happen.

{% hint style="warning" %}
This process will require recreating the **sharelatex** container which will result in some downtime. We highly recommend that you familiarize yourself with this process by going through it on a test/staging environment first.
{% endhint %}

{% stepper %}
{% step %}

### Ask your users to update their email addresses

Overleaf accounts are tied to email addresses, so the first step is to get your users' Overleaf emails in sync with their LDAP or SAML emails.

In our example, you'd ask Alice to sign into their Overleaf account and change their email from `alice@example.com` to `alicejones@tech.example.com`.

{% hint style="warning" %}
Don't forget yourself! If you're an admin, you'll need to update your own email address too.
{% endhint %}

{% hint style="success" %}
If you have a lot of users, you can use the [Username migration](https://docs.overleaf.com/on-premises/user-and-project-management/user-management/username-migration) script to change a user's primary email address in bulk.
{% endhint %}
{% endstep %}

{% step %}

### Enable the LDAP or SAML module

Once everyone's email addresses are updated, it's time to flick the switch! You'll need to set the right environment variables for your new authentication method and then recreate the **sharelatex** container using the `bin/up -d` command.

This swaps out the standard Overleaf login form for your new LDAP or SAML one.

{% hint style="info" %}
You can find the relevant information for enabling LDAP [here](https://docs.overleaf.com/on-premises/configuration/overleaf-toolkit/server-pro-only-configuration/ldap), and SAML 2.0 [here](https://docs.overleaf.com/on-premises/configuration/overleaf-toolkit/server-pro-only-configuration/saml-2.0).
{% endhint %}
{% endstep %}

{% step %}

### Users can now log in via LDAP or SAML

The next time Alice goes to log in, they'll see the new form. 

<figure><img src="https://2850099015-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLCmuQkv8BdnubVz6P6Pw%2Fuploads%2F1TUs8qOSkqzoFZVFC5xU%2Fimage.png?alt=media&#x26;token=2114e86b-0f99-4352-9bd7-600ca8d29ecb" alt="LDAP/Active Directory Log in page"><figcaption></figcaption></figure>

They can enter their LDAP username (`alicejones`) and password, and because their email address now matches the one in LDAP, they'll be logged right into their existing Overleaf account. All their projects will be exactly where they left them.&#x20;

If you've enabled SAML 2.0, users will see a button that when clicked, will redirect them to your IdP to enter their credentials. On successful authentication, they'll be redirected back to your Overleaf instance and logged into their account.

<figure><img src="https://2850099015-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLCmuQkv8BdnubVz6P6Pw%2Fuploads%2FxvBi86tj5msvCqY0CyWX%2Fimage.png?alt=media&#x26;token=c896c232-e505-4c3d-8ded-dd0875b19e78" alt="SAML Log in page"><figcaption></figcaption></figure>

{% hint style="success" %}
See the [Environment Variables](https://docs.overleaf.com/on-premises/configuration/overleaf-toolkit/environment-variables) page for information on customizing the login page experience.
{% endhint %}

And if you ever need to roll-back, just comment out the LDAP/SAML configuration and recreate the **sharelatex** container using the `bin/up -d` command. Users will then be able to log in using their current email address and Overleaf-specific password.
{% endstep %}
{% endstepper %}

## Going the other way: Switching from LDAP/SAML back to native authentication

What if you've been using LDAP or SAML for a while and want to move to Overleaf's built-in login system (maybe you deprecated your LDAP)? No problem! Here's how you can make that switch.

{% stepper %}
{% step %}

### Check that everyone's email is correct

Your users' accounts are already linked to their LDAP or SAML email addresses. This is the email they'll use to log in from now on, so just make sure everything looks right.
{% endstep %}

{% step %}

### Disable the LDAP or SAML module

Simply remove or unset the LDAP/SAML configuration settings and recreate the **sharelatex** container using the `bin/up -d` command. This will bring back the native Overleaf email and password login form.

<figure><img src="https://2850099015-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FLCmuQkv8BdnubVz6P6Pw%2Fuploads%2FcZmk7nqG5q2fe3pTzO81%2Fimage.png?alt=media&#x26;token=64de0b3c-ee26-4735-b283-796b2e1f0561" alt="Native authentication Log in page"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Ask users to reset their passwords

When your users visit the login page now, they'll see the Overleaf login form instead of the LDAP/SAML one.

Since they may never have had a native Overleaf password, they'll need to create one. Each user should:

1. Click the "Forgot your password?" link.
2. Enter the email address associated with their account (the one from LDAP/SAML).
3. Follow the link in the password-reset email to set a new password.

{% hint style="info" %}
If you haven't already done so, check out our guide on enabling [Email delivery](https://docs.overleaf.com/on-premises/configuration/overleaf-toolkit/email-delivery).
{% endhint %}

Once that's done, they can log in with their email and their new Overleaf-specific password to access all their projects.&#x20;
{% endstep %}
{% endstepper %}