index.md

---
stage: Secure
group: Dynamic Analysis
info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
type: reference, howto
---

# Dynamic Application Security Testing (DAST) **(ULTIMATE)**

> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/4348) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 10.4.

NOTE: **Note:**
The whitepaper ["A Seismic Shift in Application Security"](https://about.gitlab.com/resources/whitepaper-seismic-shift-application-security/)
explains how **4 of the top 6 attacks were application based**. Download it
to learn how to protect your organization.

Running [static checks](../sast/index.md) on your code is the first step to detect
vulnerabilities that can put the security of your code at risk. Yet, once
deployed, your application is exposed to a new category of possible attacks,
such as cross-site scripting or broken authentication flaws. This is where
Dynamic Application Security Testing (DAST) comes into place.

## Overview

If you're using [GitLab CI/CD](../../../ci/README.md), you can analyze your running web applications
for known vulnerabilities using Dynamic Application Security Testing (DAST).
You can take advantage of DAST by either [including the CI job](#configuration) in
your existing `.gitlab-ci.yml` file or by implicitly using
[Auto DAST](../../../topics/autodevops/stages.md#auto-dast-ultimate),
provided by [Auto DevOps](../../../topics/autodevops/index.md).

GitLab checks the DAST report, compares the found vulnerabilities between the source and target
branches, and shows the information on the merge request.

NOTE: **Note:**
This comparison logic uses only the latest pipeline executed for the target branch's base commit.
Running the pipeline on any other commit has no effect on the merge request.

![DAST Widget](img/dast_v13_2.png)

By clicking on one of the detected linked vulnerabilities, you can
see the details and the URL(s) affected.

![DAST Widget Clicked](img/dast_single_v13_0.png)

[Dynamic Application Security Testing (DAST)](https://en.wikipedia.org/wiki/Dynamic_Application_Security_Testing)
uses the popular open source tool [OWASP Zed Attack Proxy](https://www.zaproxy.org/)
to perform an analysis on your running web application.

By default, DAST executes [ZAP Baseline Scan](https://www.zaproxy.org/docs/docker/baseline-scan/)
and performs passive scanning only. It doesn't actively attack your application.
However, DAST can be [configured](#full-scan)
to also perform an *active scan*: attack your application and produce a more extensive security report.
It can be very useful combined with [Review Apps](../../../ci/review_apps/index.md).

NOTE: **Note:**
A pipeline may consist of multiple jobs, including SAST and DAST scanning. If any
job fails to finish for any reason, the security dashboard doesn't show DAST scanner
output. For example, if the DAST job finishes but the SAST job fails, the security
dashboard doesn't show DAST results. The analyzer outputs an
[exit code](../../../development/integrations/secure.md#exit-code) on failure.

## Use cases

It helps you automatically find security vulnerabilities in your running web
applications while you're developing and testing your applications.

## Requirements

To run a DAST job, you need GitLab Runner with the
[`docker` executor](https://docs.gitlab.com/runner/executors/docker.html).

## Configuration

For GitLab 11.9 and later, to enable DAST, you must
[include](../../../ci/yaml/README.md#includetemplate) the
[`DAST.gitlab-ci.yml` template](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Security/DAST.gitlab-ci.yml)
that's provided as a part of your GitLab installation. For GitLab versions earlier
than 11.9, you can copy and use the job as defined in that template.

Add the following to your `.gitlab-ci.yml` file:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_WEBSITE: https://example.com
```

There are two ways to define the URL to be scanned by DAST:

1. Set the `DAST_WEBSITE` [variable](../../../ci/yaml/README.md#variables).

1. Add it in an `environment_url.txt` file at the root of your project.
   This is great for testing in dynamic environments. In order to run DAST against
   an app dynamically created during a GitLab CI/CD pipeline, have the app
   persist its domain in an `environment_url.txt` file, and DAST
   automatically parses that file to find its scan target.
   You can see an [example](https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Jobs/Deploy.gitlab-ci.yml)
   of this in our Auto DevOps CI YAML.

If both values are set, the `DAST_WEBSITE` value takes precedence.

The included template creates a `dast` job in your CI/CD pipeline and scans
your project's source code for possible vulnerabilities.

The results are saved as a
[DAST report artifact](../../../ci/pipelines/job_artifacts.md#artifactsreportsdast-ultimate)
that you can later download and analyze. Due to implementation limitations we
always take the latest DAST artifact available. Behind the scenes, the
[GitLab DAST Docker image](https://gitlab.com/gitlab-org/security-products/dast)
is used to run the tests on the specified URL and scan it for possible vulnerabilities.

By default, the DAST template uses the latest major version of the DAST Docker
image. Using the `DAST_VERSION` variable, you can choose how DAST updates:

- Automatically update DAST with new features and fixes by pinning to a major version (such as `1`).
- Only update fixes by pinning to a minor version (such as `1.6`).
- Prevent all updates by pinning to a specific version (such as `1.6.4`).

Find the latest DAST versions on the [Releases](https://gitlab.com/gitlab-org/security-products/dast/-/releases) page.

### When DAST scans run

When using `DAST.gitlab-ci.yml` template, the `dast` job is run last as shown in
the example below. To ensure DAST is scanning the latest code, your CI pipeline
should deploy changes to the web server in one of the jobs preceding the `dast` job.

```yaml
stages:
  - build
  - test
  - deploy
  - dast
```

Be aware that if your pipeline is configured to deploy to the same webserver in
each run, running a pipeline while another is still running could cause a race condition
where one pipeline overwrites the code from another pipeline. The site to be scanned
should be excluded from changes for the duration of a DAST scan.
The only changes to the site should be from the DAST scanner. Be aware that any
changes that users, scheduled tasks, database changes, code changes, other pipelines, or other scanners make to
the site during a scan could lead to inaccurate results.

### Hide sensitive information

> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/36332) in GitLab 13.1.

HTTP request and response headers may contain sensitive information, including cookies and
authorization credentials. By default, the following headers are masked:

- `Authorization`.
- `Proxy-Authorization`.
- `Set-Cookie` (values only).
- `Cookie` (values only).

Using the [`DAST_MASK_HTTP_HEADERS` variable](#available-variables), you can list the
headers whose values you want masked. For details on how to mask headers, see
[Customizing the DAST settings](#customizing-the-dast-settings).

### Authentication

It's also possible to authenticate the user before performing the DAST checks.

Create masked variables to pass the credentials that DAST uses.
To create masked variables for the username and password, see [Create a custom variable in the UI](../../../ci/variables/README.md#create-a-custom-variable-in-the-ui).
Note that the key of the username variable must be `DAST_USERNAME`
and the key of the password variable must be `DAST_PASSWORD`.

Other variables that are related to authenticated scans are:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_WEBSITE: https://example.com
  DAST_AUTH_URL: https://example.com/sign-in
  DAST_USERNAME_FIELD: session[user] # the name of username field at the sign-in HTML form
  DAST_PASSWORD_FIELD: session[password] # the name of password field at the sign-in HTML form
  DAST_AUTH_EXCLUDE_URLS: http://example.com/sign-out,http://example.com/sign-out-2 # optional, URLs to skip during the authenticated scan; comma-separated, no spaces in between
```

The results are saved as a
[DAST report artifact](../../../ci/pipelines/job_artifacts.md#artifactsreportsdast-ultimate)
that you can later download and analyze.
Due to implementation limitations, we always take the latest DAST artifact available.

DANGER: **Danger:**
**NEVER** run an authenticated scan against a production server. When an authenticated
scan is run, it may perform *any* function that the authenticated user can. This
includes actions like modifying and deleting data, submitting forms, and following links.
Only run an authenticated scan against a test server.

### Full scan

DAST can be configured to perform [ZAP Full Scan](https://github.com/zaproxy/zaproxy/wiki/ZAP-Full-Scan), which
includes both passive and active scanning against the same target website:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_FULL_SCAN_ENABLED: "true"
```

NOTE: **Note:**
If your DAST job exceeds the job timeout and you need to reduce the scan duration, we shared some tips for optimizing DAST scans in a [blog post](https://about.gitlab.com/blog/2020/08/31/how-to-configure-dast-full-scans-for-complex-web-applications/).

#### Domain validation

The DAST job can be run anywhere, which means you can accidentally hit live web servers
and potentially damage them. You could even take down your production environment.
For that reason, you should use domain validation.

Domain validation is not required by default. It can be required by setting the
[environment variable](#available-variables) `DAST_FULL_SCAN_DOMAIN_VALIDATION_REQUIRED` to `"true"`.

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_FULL_SCAN_ENABLED: "true"
  DAST_FULL_SCAN_DOMAIN_VALIDATION_REQUIRED: "true"
```

Since ZAP full scan actively attacks the target application, DAST sends a ping
to the target (normally defined in `DAST_WEBSITE` or `environment_url.txt`) beforehand.

- If `DAST_FULL_SCAN_DOMAIN_VALIDATION_REQUIRED` is `false` or unset, the scan
  proceeds unless the response to the ping includes a `Gitlab-DAST-Permission`
  header with a value of `deny`.
- If `DAST_FULL_SCAN_DOMAIN_VALIDATION_REQUIRED` is `true`, the scan exits
  unless the response to the ping includes a `Gitlab-DAST-Permission` header with
  a value of `allow`.

Here are some examples of adding the `Gitlab-DAST-Permission` header to a response
in Rails, Django, and Node (with Express).

##### Ruby on Rails

Here's how you would add a
[custom header in Ruby on Rails](https://guides.rubyonrails.org/action_controller_overview.html#setting-custom-headers):

```ruby
class DastWebsiteTargetController < ActionController::Base
  def dast_website_target
    response.headers['Gitlab-DAST-Permission'] = 'allow'

    head :ok
  end
end
```

##### Django

Here's how you would add a
[custom header in Django](https://docs.djangoproject.com/en/2.2/ref/request-response/#setting-header-fields):

```python
class DastWebsiteTargetView(View):
    def head(self, *args, **kwargs):
      response = HttpResponse()
      response['Gitlab-Dast-Permission'] = 'allow'

      return response
```

##### Node (with Express)

Here's how you would add a
[custom header in Node (with Express)](http://expressjs.com/en/5x/api.html#res.append):

```javascript
app.get('/dast-website-target', function(req, res) {
  res.append('Gitlab-DAST-Permission', 'allow')
  res.send('Respond to DAST ping')
})
```

##### Domain validation header via a proxy

It's also possible to add the `Gitlab-DAST-Permission` header via a proxy.

###### NGINX

The following configuration allows NGINX to act as a reverse proxy and add the
`Gitlab-DAST-Permission` [header](http://nginx.org/en/docs/http/ngx_http_headers_module.html#add_header):

```nginx
# default.conf
server {
    listen 80;
    server_name localhost;

    location / {
        proxy_pass http://test-application;
        add_header Gitlab-DAST-Permission allow;
    }
}
```

###### Apache

Apache can also be used as a [reverse proxy](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html)
to add the `Gitlab-DAST-Permission` [header](https://httpd.apache.org/docs/current/mod/mod_headers.html).

To do so, add the following lines to `httpd.conf`:

```plaintext
# httpd.conf
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so

<VirtualHost *:80>
  ProxyPass "/" "http://test-application.com/"
  ProxyPassReverse "/" "http://test-application.com/"
  Header set Gitlab-DAST-Permission "allow"
</VirtualHost>
```

[This snippet](https://gitlab.com/gitlab-org/security-products/dast/snippets/1894732) contains a complete `httpd.conf` file
configured to act as a remote proxy and add the `Gitlab-DAST-Permission` header.

### API scan

> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/10928) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 12.10.

Using an API specification as a scan's target is a useful way to seed URLs for scanning an API.
Vulnerability rules in an API scan are different than those in a normal website scan.

#### Specification format

API scans support OpenAPI V2 and OpenAPI V3 specifications. You can define these specifications using `JSON` or `YAML`.

#### Import API specification from a URL

If your API specification is accessible at a URL, you can pass that URL in directly as the target.
The specification does not have to be hosted on the same host as the API being tested.

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_API_SPECIFICATION: http://my.api/api-specification.yml
```

#### Import API specification from a file

If your API specification is in your repository, you can provide the specification's
filename directly as the target. The specification file is expected to be in the
`/zap/wrk` directory.

```yaml
dast:
  script:
    - mkdir -p /zap/wrk
    - cp api-specification.yml /zap/wrk/api-specification.yml
    - /analyze -t $DAST_WEBSITE
  variables:
    GIT_STRATEGY: fetch
    DAST_API_SPECIFICATION: api-specification.yml
```

#### Full scan

API scans support full scanning, which can be enabled by using the `DAST_FULL_SCAN_ENABLED`
environment variable. Domain validation is not supported for full API scans.

#### Host override

Specifications often define a host, which contains a domain name and a port. The
host referenced may be different than the host of the API's review instance.
This can cause incorrect URLs to be imported, or a scan on an incorrect host.
Use the `DAST_API_HOST_OVERRIDE` environment variable to override these values.

For example, with a OpenAPI V3 specification containing:

```yaml
servers:
  - url: https://api.host.com
```

If the test version of the API is running at `https://api-test.host.com`, then
the following DAST configuration can be used:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_API_SPECIFICATION: http://api-test.host.com/api-specification.yml
  DAST_API_HOST_OVERRIDE: api-test.host.com
```

NOTE: **Note:**
Using a host override is ONLY supported when importing the API
specification from a URL. It does not work and will be ignored when importing
the specification from a file. This is due to a limitation in the ZAP OpenAPI
extension.

#### Authentication using headers

Tokens in request headers are often used as a way to authenticate API requests.
You can achieve this by using the `DAST_REQUEST_HEADERS` environment variable.
Headers are applied to every request DAST makes.

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_API_SPECIFICATION: http://api-test.api.com/api-specification.yml
  DAST_REQUEST_HEADERS: "Authorization: Bearer my.token"
```

### Customizing the DAST settings

CAUTION: **Deprecation:**
Beginning in GitLab 13.0, the use of [`only` and `except`](../../../ci/yaml/README.md#onlyexcept-basic)
is no longer supported. When overriding the template, you must use [`rules`](../../../ci/yaml/README.md#rules) instead.

The DAST settings can be changed through environment variables by using the
[`variables`](../../../ci/yaml/README.md#variables) parameter in `.gitlab-ci.yml`.
These variables are documented in [available variables](#available-variables).

For example:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_WEBSITE: https://example.com
  DAST_SPIDER_MINS: 120
```

Because the template is [evaluated before](../../../ci/yaml/README.md#include) the pipeline
configuration, the last mention of the variable takes precedence.

### Available variables

DAST can be [configured](#customizing-the-dast-settings) using environment variables.

| Environment variable        | Type | Description                                                                    |
|-----------------------------| -----------|--------------------------------------------------------------------------------|
| `SECURE_ANALYZERS_PREFIX`   | URL | Set the Docker registry base address from which to download the analyzer. |
| `DAST_WEBSITE`  | URL | The URL of the website to scan. `DAST_API_SPECIFICATION` must be specified if this is omitted. |
| `DAST_API_SPECIFICATION`  | URL or string | The API specification to import. The specification can be hosted at a URL, or the name of a file present in the `/zap/wrk` directory. `DAST_WEBSITE` must be specified if this is omitted. |
| `DAST_AUTH_URL` | URL | The URL of the page containing the sign-in HTML form on the target website. `DAST_USERNAME` and `DAST_PASSWORD` are submitted with the login form to create an authenticated scan. Not supported for API scans. |
| `DAST_USERNAME` | string | The username to authenticate to in the website. |
| `DAST_PASSWORD` | string | The password to authenticate to in the website. |
| `DAST_USERNAME_FIELD` | string | The name of username field at the sign-in HTML form. |
| `DAST_PASSWORD_FIELD` | string | The name of password field at the sign-in HTML form. |
| `DAST_MASK_HTTP_HEADERS` | string | Comma-separated list of request and response headers to be masked (GitLab 13.1). Must contain **all** headers to be masked. Refer to [list of headers that are masked by default](#hide-sensitive-information). |
| `DAST_AUTH_EXCLUDE_URLS` | URLs | The URLs to skip during the authenticated scan; comma-separated. Regular expression syntax can be used to match multiple URLs. For example, `.*` matches an arbitrary character sequence. Not supported for API scans. |
| `DAST_FULL_SCAN_ENABLED` | boolean | Set to `true` to run a [ZAP Full Scan](https://github.com/zaproxy/zaproxy/wiki/ZAP-Full-Scan) instead of a [ZAP Baseline Scan](https://github.com/zaproxy/zaproxy/wiki/ZAP-Baseline-Scan). Default: `false` |
| `DAST_FULL_SCAN_DOMAIN_VALIDATION_REQUIRED` | boolean | Set to `true` to require [domain validation](#domain-validation) when running DAST full scans. Not supported for API scans. Default: `false` |
| `DAST_AUTO_UPDATE_ADDONS` | boolean | ZAP add-ons are pinned to specific versions in the DAST Docker image. Set to `true` to download the latest versions when the scan starts. Default: `false` |
| `DAST_API_HOST_OVERRIDE` | string | Used to override domains defined in API specification files. Only supported when importing the API specification from a URL. Example: `example.com:8080` |
| `DAST_EXCLUDE_RULES` | string | Set to a comma-separated list of Vulnerability Rule IDs to exclude them from running during the scan. Rule IDs are numbers and can be found from the DAST log or on the [ZAP project](https://github.com/zaproxy/zaproxy/blob/develop/docs/scanners.md). For example, `HTTP Parameter Override` has a rule ID of `10026`. **Note:** In earlier versions of GitLab the excluded rules were executed but alerts they generated were suppressed. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/118641) in GitLab 12.10. |
| `DAST_REQUEST_HEADERS` | string | Set to a comma-separated list of request header names and values. Headers are added to every request made by DAST. For example, `Cache-control: no-cache,User-Agent: DAST/1.0` |
| `DAST_DEBUG` | boolean | Enable debug message output. Default: `false` |
| `DAST_SPIDER_MINS` | number | The maximum duration of the spider scan in minutes. Set to `0` for unlimited. Default: One minute, or unlimited when the scan is a full scan. |
| `DAST_HTML_REPORT` | string | The filename of the HTML report written at the end of a scan. |
| `DAST_MARKDOWN_REPORT` | string | The filename of the Markdown report written at the end of a scan. |
| `DAST_XML_REPORT` | string | The filename of the XML report written at the end of a scan. |
| `DAST_INCLUDE_ALPHA_VULNERABILITIES` | boolean | Set to `true` to include alpha passive and active scan rules. Default: `false` |
| `DAST_USE_AJAX_SPIDER` | boolean | Set to `true` to use the AJAX spider in addition to the traditional spider, useful for crawling sites that require JavaScript. Default: `false` |
| `DAST_ZAP_CLI_OPTIONS` | string | ZAP server command-line options. For example, `-Xmx3072m` would set the Java maximum memory allocation pool size. |
| `DAST_ZAP_LOG_CONFIGURATION` | string | Set to a semicolon-separated list of additional log4j properties for the ZAP Server. For example, `log4j.logger.org.parosproxy.paros.network.HttpSender=DEBUG;log4j.logger.com.crawljax=DEBUG` |

### DAST command-line options

Not all DAST configuration is available via environment variables. To find out all
possible options, run the following configuration.
Available command-line options are printed to the job log:

```yaml
include:
  template: DAST.gitlab-ci.yml

dast:
  script:
    - /analyze --help
```

You must then overwrite the `script` command to pass in the appropriate
argument. For example, passive scanning can be delayed using option `-D`. The following
configuration delays passive scanning by five minutes:

```yaml
include:
  template: DAST.gitlab-ci.yml

dast:
  script:
    - export DAST_WEBSITE=${DAST_WEBSITE:-$(cat environment_url.txt)}
    - /analyze -D 300 -t $DAST_WEBSITE
```

### Custom ZAProxy configuration

The ZAProxy server contains many [useful configurable values](https://gitlab.com/gitlab-org/gitlab/-/issues/36437#note_245801885).
Many key/values for `-config` remain undocumented, but there is an untested list of
[possible keys](https://gitlab.com/gitlab-org/gitlab/-/issues/36437#note_244981023).
Note that these options are not supported by DAST, and may break the DAST scan
when used. An example of how to rewrite the Authorization header value with `TOKEN` follows:

```yaml
include:
  template: DAST.gitlab-ci.yml

variables:
  DAST_ZAP_CLI_OPTIONS: "-config replacer.full_list(0).description=auth -config replacer.full_list(0).enabled=true -config replacer.full_list(0).matchtype=REQ_HEADER -config replacer.full_list(0).matchstr=Authorization -config replacer.full_list(0).regex=false -config replacer.full_list(0).replacement=TOKEN"
```

### Cloning the project's repository

The DAST job does not require the project's repository to be present when running, so by default
[`GIT_STRATEGY`](../../../ci/yaml/README.md#git-strategy) is set to `none`.

### Debugging DAST jobs

A DAST job has two executing processes:

- The ZAP server.
- A series of scripts that start, control and stop the ZAP server.

Debug mode of the scripts can be enabled by using the `DAST_DEBUG` environment variable. This can help when troubleshooting the job,
and outputs statements indicating what percentage of the scan is complete.
For details on using variables, see [Overriding the DAST template](#customizing-the-dast-settings).

Debug mode of the ZAP server can be enabled using the `DAST_ZAP_LOG_CONFIGURATION` environment variable.
The following table outlines examples of values that can be set and the effect that they have on the output that is logged.
Multiple values can be specified, separated by semicolons.

| Log configuration value                                      | Effect                                                            |
|--------------------------------------------------            | ----------------------------------------------------------------- |
| `log4j.rootLogger=DEBUG`                                     | Enable all debug logging statements.                              |
| `log4j.logger.org.apache.commons.httpclient=DEBUG`           | Log every HTTP request and response made by the ZAP server.       |
| `log4j.logger.org.zaproxy.zap.spider.SpiderController=DEBUG` | Log URLs found during the spider scan of the target.              |
| `log4j.logger.com.crawljax=DEBUG`                            | Enable Ajax Crawler debug logging statements.                     |
| `log4j.logger.org.parosproxy.paros=DEBUG`                    | Enable ZAP server proxy debug logging statements.                 |
| `log4j.logger.org.zaproxy.zap=DEBUG`                         | Enable debug logging statements of the general ZAP server code.   |

## Running DAST in an offline environment

For self-managed GitLab instances in an environment with limited, restricted, or intermittent access
to external resources through the internet, some adjustments are required for the DAST job to
successfully run. For more information, see [Offline environments](../offline_deployments/index.md).

### Requirements for offline DAST support

To use DAST in an offline environment, you need:

- GitLab Runner with the [`docker` or `kubernetes` executor](#requirements).
- Docker Container Registry with a locally available copy of the DAST
  [container image](https://gitlab.com/gitlab-org/security-products/dast), found in the
  [DAST container registry](https://gitlab.com/gitlab-org/security-products/dast/container_registry).

NOTE: **Note:**
GitLab Runner has a [default `pull policy` of `always`](https://docs.gitlab.com/runner/executors/docker.html#using-the-always-pull-policy),
meaning the Runner tries to pull Docker images from the GitLab container registry even if a local
copy is available. GitLab Runner's [`pull_policy` can be set to `if-not-present`](https://docs.gitlab.com/runner/executors/docker.html#using-the-if-not-present-pull-policy)
in an offline environment if you prefer using only locally available Docker images. However, we
recommend keeping the pull policy setting to `always` if not in an offline environment, as this
enables the use of updated scanners in your CI/CD pipelines.

### Make GitLab DAST analyzer images available inside your Docker registry

For DAST, import the following default DAST analyzer image from `registry.gitlab.com` to your [local Docker container registry](../../packages/container_registry/index.md):

- `registry.gitlab.com/gitlab-org/security-products/dast:latest`

The process for importing Docker images into a local offline Docker registry depends on
**your network security policy**. Please consult your IT staff to find an accepted and approved
process by which external resources can be imported or temporarily accessed. Note
that these scanners are [updated periodically](../index.md#maintenance-and-update-of-the-vulnerabilities-database)
with new definitions, so consider if you're able to make periodic updates yourself.

For details on saving and transporting Docker images as a file, see Docker's documentation on
[`docker save`](https://docs.docker.com/engine/reference/commandline/save/),
[`docker load`](https://docs.docker.com/engine/reference/commandline/load/),
[`docker export`](https://docs.docker.com/engine/reference/commandline/export/), and
[`docker import`](https://docs.docker.com/engine/reference/commandline/import/).

### Set DAST CI job variables to use local DAST analyzers

Add the following configuration to your `.gitlab-ci.yml` file. You must replace `image` to refer to
the DAST Docker image hosted on your local Docker container registry:

```yaml
include:
  - template: DAST.gitlab-ci.yml
dast:
  image: registry.example.com/namespace/dast:latest
```

The DAST job should now use local copies of the DAST analyzers to scan your code and generate
security reports without requiring internet access.

Alternatively, you can use the variable `SECURE_ANALYZERS_PREFIX` to override the base registry address of the `dast` image.

## On-Demand Scans

> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/218465) in GitLab 13.2.
> - [Improved](https://gitlab.com/gitlab-org/gitlab/-/issues/218465) in GitLab 13.3.
> - It's deployed behind a feature flag, enabled by default.
> - It's enabled on GitLab.com.
> - It's able to be enabled or disabled per-project.
> - To use it in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-on-demand-scans).

You can run a passive DAST scan against a target website, outside the DevOps lifecycle. These scans
are always associated with the default branch of your project and the results are available in the
project dashboard.

### Site profile

An on-demand scan requires a site profile, which includes a profile name and target URL. The profile
name allows you to describe the site to be scanned. The target URL specifies the URL against which
the DAST scan is run.

### Run an on-demand scan

NOTE: **Note:**
You must have permission to run an on-demand DAST scan against a protected branch.
The default branch is automatically protected. For more details, see [Pipeline security on protected branches](../../../ci/pipelines/index.md#pipeline-security-on-protected-branches).

Running an on-demand scan requires an existing site profile. If a site profile for the target URL
doesn't exist, first [create a site profile](#create-a-site-profile). An on-demand DAST scan has
a fixed timeout of 60 seconds.

- Navigate to your project's home page, then click **On-demand Scans** in the left sidebar.
- Click **Create new DAST scan**.
- Select a site profile from the profiles dropdown.
- Click **Run scan**.

#### Create a site profile

- Navigate to your project's home page, then click **On-demand Scans** in the left sidebar.
- Click **Create new DAST scan**.
- Click **New Site Profile**.
- Type in a unique **Profile name** and **Target URL** then click **Save profile**.

#### Delete a site profile

- Navigate to your project's home page, then click **On-demand Scans** in the left sidebar.
- Click **Create new DAST scan**.
- Click **Delete** in the matching site profile's row.

### Enable or disable On-demand Scans

On-demand Scans is enabled by default. You can disable On-demand Scans
instance-wide, or disable it for specific projects if you prefer.

Use of On-demand Scans requires the `security_on_demand_scans_feature_flag`
feature flag enabled.

[GitLab administrators with access to the GitLab Rails console](../../../administration/feature_flags.md)
can disable or enable the feature flags.

#### Enable or disable On-demand Scans

To disable On-demand Scans:

```ruby
# Instance-wide
Feature.disable(:security_on_demand_scans_feature_flag)
# or by project
Feature.disable(:security_on_demand_scans_feature_flag, Project.find(<project id>))
```

To enable On-demand Scans:

```ruby
# Instance-wide
Feature.enable(:security_on_demand_scans_feature_flag)
# or by project
Feature.enable(:security_on_demand_scans_feature_flag, Project.find(<project ID>))
```

## Reports

The DAST tool outputs a report file in JSON format by default. However, this tool can also generate reports in
Markdown, HTML, and XML. For more information, see the [schema for DAST reports](https://gitlab.com/gitlab-org/security-products/security-report-schemas/-/blob/master/dist/dast-report-format.json).

### List of URLs scanned

When DAST completes scanning, the merge request page states the number of URLs scanned.
Click **View details** to view the web console output which includes the list of scanned URLs.

![DAST Widget](img/dast_urls_scanned_v12_10.png)

### JSON

CAUTION: **Caution:**
The JSON report artifacts are not a public API of DAST and their format is expected to change in the future.

The DAST tool always emits a JSON report file called `gl-dast-report.json` and
sample reports can be found in the
[DAST repository](https://gitlab.com/gitlab-org/security-products/dast/-/tree/master/test/end-to-end/expect).

There are two formats of data in the JSON report that are used side by side:

- The proprietary ZAP format that will be eventually deprecated.
- A common format that will be the default in the future.

### Other formats

Reports can also be generated in Markdown, HTML, and XML. These can be published as artifacts using the following configuration:

```yaml
include:
  template: DAST.gitlab-ci.yml

dast:
  variables:
    DAST_HTML_REPORT: report.html
    DAST_MARKDOWN_REPORT: report.md
    DAST_XML_REPORT: report.xml
  artifacts:
    paths:
      - $DAST_HTML_REPORT
      - $DAST_MARKDOWN_REPORT
      - $DAST_XML_REPORT
      - gl-dast-report.json
```

## Security Dashboard

The Security Dashboard is a good place to get an overview of all the security
vulnerabilities in your groups, projects and pipelines. Read more about the
[Security Dashboard](../security_dashboard/index.md).

## Bleeding-edge vulnerability definitions

ZAP first creates rules in the `alpha` class. After a testing period with
the community, they are promoted to `beta`. DAST uses `beta` definitions by
default. To request `alpha` definitions, use the
`DAST_INCLUDE_ALPHA_VULNERABILITIES` environment variable as shown in the
following configuration:

```yaml
include:
  template: DAST.gitlab-ci.yml

variables:
  DAST_INCLUDE_ALPHA_VULNERABILITIES: true
```

## Interacting with the vulnerabilities

Once a vulnerability is found, you can interact with it. Read more on how to
[interact with the vulnerabilities](../index.md#interacting-with-the-vulnerabilities).

## Vulnerabilities database update

For more information about the vulnerabilities database update, check the
[maintenance table](../index.md#maintenance-and-update-of-the-vulnerabilities-database).

## Optimizing DAST

By default, DAST downloads all artifacts defined by previous jobs in the pipeline. If
your DAST job does not rely on `environment_url.txt` to define the URL under test or any other files created
in previous jobs, we recommend you don't download artifacts. To avoid downloading
artifacts, add the following to your `gitlab-ci.yml` file:

```json
dast:
   dependencies: []
```

## Troubleshooting

### Running out of memory

By default, ZAProxy, which DAST relies on, is allocated memory that sums to 25%
of the total memory on the host.
Since it keeps most of its information in memory during a scan,
it's possible for DAST to run out of memory while scanning large applications.
This results in the following error:

```plaintext
[zap.out] java.lang.OutOfMemoryError: Java heap space
```

Fortunately, it's straightforward to increase the amount of memory available
for DAST by using the `DAST_ZAP_CLI_OPTIONS` environment variable:

```yaml
include:
  - template: DAST.gitlab-ci.yml

variables:
  DAST_ZAP_CLI_OPTIONS: "-Xmx3072m"
```

Here, DAST is being allocated 3072 MB.
Change the number after `-Xmx` to the required memory amount.

### DAST job exceeding the job timeout

If your DAST job exceeds the job timeout and you need to reduce the scan duration, we shared some tips for optimizing DAST scans in a [blog post](https://about.gitlab.com/blog/2020/08/31/how-to-configure-dast-full-scans-for-complex-web-applications/).

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