# Security Policies

<figure><img src="/files/mfI3UnmgdtoJlcUlwmzg" alt=""><figcaption></figcaption></figure>

## **Overview**

**Security Policies** assign security rulesets to specific paths within applications and APIs. When a request is received, Link11 WAAP finds the Security Policy assigned to its destination Server Group (i.e., the destination site). That Policy then specifies the security rules to enforce upon the request, according to its destination URL.

Each Security Policy also includes a definition of the Session ID to use within its scope. This is an important setting, as discussed below.

## Usage within applications and APIs

Security Policies are used within [Server Groups](/console-walkthrough/sites/server-groups.md). Every Server Group includes a Security Policy.

<figure><img src="/files/uiNsn3RqCbtNQUDLvZnM" alt=""><figcaption></figcaption></figure>

Every L11WAAP deployment contains a default Security Policy. This default Policy cannot be deleted. Admins can define additional Policies as well.

## Administration

The main page (shown at the top of the page) lists all current Security Policies.

The administration (addition/deletion/editing/versioning) of Policies follows the conventions described [here](/how-link11-waap-works/ui-overview-and-common-elements.md#configuration-and-administration).

## Components

Each Security Policy contains the following:

* A list of paths or scopes within which this Policy will be applied.
* The [Content Filter Profile](/console-walkthrough/security/content-filter/profiles.md), [ACL Profile](/console-walkthrough/security/acl-policies.md), and (optional) [Rate Limit Rule(s)](/console-walkthrough/security/rate-limit-rules.md) that will be enforced on requests sent to the specified paths.
* Optional Edge Functions(s) to run when requests are sent to the specified paths.
* One or more *Tags* that will be attached to requests sent to the specified paths.
* What to use as a Session ID for requests sent to the specified paths. This is used elsewhere by the system; for example, [Rate Limit Rules can be enforced on a per-session basis](/console-walkthrough/security/rate-limit-rules.md#rate-limiting-within-sessions).
* General parameters for administration.

## Individual parameters

<figure><img src="/files/M9kdFiPiOKytzojLfpNw" alt=""><figcaption></figcaption></figure>

### Name

A name for this Policy, to be used within the interface. A [system tag](/how-link11-waap-works/tagging.md#system-tags) (shown below the *Tags* field) will include it as well.

### Description

Information about this Policy, for use within the interface.

### Tags

A list of one or more tags, separated by spaces. Whenever this Security Policy is applied to a request, these tags will appear in the Events Log.

In addition to these admin-defined tags, the system also shows some [system tags](/how-link11-waap-works/tagging.md#system-tags) that will be attached as well.

### Main Session ID & Other Session IDs

Some types of settings within L11WAAP allow admins to track user activity and enforce security rules based on the user's Session ID. (Examples of this include [Flow Control Policies ](/console-walkthrough/security/flow-control-policies.md)and [Rate Limit Rules](/console-walkthrough/security/rate-limit-rules.md).)&#x20;

However, the definition of a Session ID can vary. The optimal combination of request parameters can differ, depending on the circumstances.

The *Main Session ID* and *Other Session IDs* define the request parameters that should be combined and used as the Session ID within the scope of this Security Policy.

*Main Session ID*: This is the header, cookie, argument, or attribute that will be the Session ID by default.

*Other Session IDs*: This is a list of additional headers, cookies, arguments, and/or attributes that might, or might not, be available, depending on the situation. When they are available, they are combined with the *Main Session ID* to form the Session ID used by L11WAAP.

Example: the *Main Session ID* is set to `Header` / `user_id`, and *Other Session IDs* contains one entry for an authentication token (`Header` / `auth_token)`. Initially, the Session ID will consist of the `user_id` alone. Once the user is authenticated and the requests begin to include `auth_token` too, the Session ID will then be a combination of those two values.&#x20;

Another example: the *Main Session ID* is set to `Header` / `user_id`. In *Other Session IDs*, there is one definition (`Header` / `device_id`) for a field that is sent by a mobile application.&#x20;

* If the user is using the mobile application, then `device_id` will be included in the incoming requests, and the Session ID will be a combination of `user_id` and `device_id`.
* If the user is using a browser instead, then `device_id` will not be defined, and the Session ID will consist solely of `user_id`.

{% hint style="info" %}
The choice of parameters for the Session ID should be carefully considered, because it can affect the performance of various security settings and rules. Sometimes, a narrowly-defined Session ID is better, while in other situations, a broader definition should be used.&#x20;

For example, an admin has defined a [Rate Limit Rule](/console-walkthrough/security/rate-limit-rules.md) based on Session ID. A threat actor then begins a session in a web browser, copies its session tokens, and tries to use them in a brute force attack across different IPs and distributed networks in the cloud.&#x20;

* If the applicable Security Policy has a Session ID based on the session tokens, then the Rate Limit Rule will detect and block the attack.&#x20;
* If however the Session ID also includes the IP address, then a Rate Limiting Rule would maintain separate counts for each of the various IPs that are used, and the Rule would not perform as the admin had intended.
  {% endhint %}

### Path Mapping

This is a list of paths, and the security settings (Content Filter Profiles, ACL Profiles, Backend Service, Rate Limit Rules, and Edge Functions) assigned to each one.

Every incoming request targets a specific URL. L11WAAP finds the best match for that URL in the Path Mapping list, and applies the security settings defined for it, along with whatever settings are contained in the special **Site Level** path definition (see below).

{% hint style="info" %}
The "best match" is determined by regex evaluation. The order in which the paths are listed in the interface does not matter. If multiple admin-defined Path Maps could match a request's destination, the longest matching regex will determine which Path Map gets selected. If no regex matches, then the `Default`  Path Map will be selected.
{% endhint %}

Out of the box, Security Policies can contain three special path definitions:

* **Root**: Will be selected for requests sent to the root level of the site.
* **Site Level**: Will be selected for all requests sent to the site (see note below).
* **Default**: Will be selected for requests that do not match any other specific path definitions.

{% hint style="info" %}
The **Site Level** definition behaves differently than other path definitions; it is *always selected* and added to the best-matching path definition for the request (including the **Default** definition). Thus, if **Site Level** contains any settings, they are used in addition to the settings contained in the best-matching definition.
{% endhint %}

#### Managing the Path Maps

A new Security Policy will include several Path Maps. Clicking on a listing will expand it for editing.

<figure><img src="/files/7vkW2u3IL5D9fFBBL2L3" alt=""><figcaption></figcaption></figure>

#### Creating Path Maps

To add a new Path Map, select an existing one, expand it, and select "**Fork Path Mapping"** at the bottom. The existing one will be cloned, and the new one will be displayed for editing.

{% hint style="info" %}
Note that the controls at the top of the window are for administering Security Policies, which generally correspond to domains. Administering Path Maps (for paths and URLs *within* the specified domain) is done in the *Path Mapping* list.
{% endhint %}

#### Path Map Fields

| **Field**                  | **Value**                                                                                                                                                                                                        |
| -------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Name**                   | A descriptive label for use within the interface.                                                                                                                                                                |
| **Path or Expression**     | An expression for the path, expressed as PCRE (Perl Compatible Regular Expressions).                                                                                                                             |
| **Content Filter Profile** | The [Content Filter Profile](/console-walkthrough/security/content-filter/profiles.md) applied to this path. Its name will be displayed in green if it is active; if displayed in red, it is currently disabled. |
| **ACL Profile**            | The [ACL Profile](/console-walkthrough/security/acl-policies.md) applied to this path. Its name will be displayed in green if it is active; if displayed in red, it is currently disabled.                       |
| **Backend service**        | The [Backend Service](/console-walkthrough/sites/backend-services.md) associated with this path. Requests that pass through L11WAAP without being blocked will be forwarded here.                                |
| **Rate Limit Rules**       | The [Rate Limit Rule(s](/console-walkthrough/security/rate-limit-rules.md)) assigned to this path.                                                                                                               |
| **Edge functions**         | The [Edge Function(s)](/console-walkthrough/sites/edge-functions.md) assigned to this path.                                                                                                                      |

In addition to editing the fields discussed above, the expanded *Path Mapping* dialog also provides the ability to:

* Activate or deactivate the Content Filter Profile (by changing its *active mode* toggle).
* Activate or deactivate the ACL Profile (by changing its *active mode* toggle).
* Add an existing Rate Limit Rule to this Path Map, via the **+** **New** button. (The **+ New** button will only be shown if there are Rate Limit Rules available.) An existing Rate Limit Rule can be removed by selecting the trash icon at the end of its entry.
* Add an existing Edge Function to this Path Map, via the **+** **New** button. (The **+ New** button will only be shown if there are Edge Functions available.) An existing Edge Function can be removed by selecting the trash icon at the end of its entry.
* Create a copy of this Path Map, and open it for editing, via the "**Fork Path Mapping**" button.


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