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# Dependency Scanning Analyzers **(ULTIMATE)**
Dependency Scanning relies on underlying third party tools that are wrapped into
what we call "Analyzers". An analyzer is a
[dedicated project ](https://gitlab.com/gitlab-org/security-products/analyzers )
that wraps a particular tool to:
- Expose its detection logic.
- Handle its execution.
- Convert its output to the common format.
This is achieved by implementing the [common API ](https://gitlab.com/gitlab-org/security-products/analyzers/common ).
Dependency Scanning supports the following official analyzers:
- [`bundler-audit` ](https://gitlab.com/gitlab-org/security-products/analyzers/bundler-audit )
- [`gemnasium` ](https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium )
- [`gemnasium-maven` ](https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium-maven )
- [`gemnasium-python` ](https://gitlab.com/gitlab-org/security-products/analyzers/gemnasium-python )
- [`retire.js` ](https://gitlab.com/gitlab-org/security-products/analyzers/retire.js )
The analyzers are published as Docker images that Dependency Scanning will use
to launch dedicated containers for each analysis.
Dependency Scanning is pre-configured with a set of **default images** that are
maintained by GitLab, but users can also integrate their own **custom images** .
## Official default analyzers
Any custom change to the official analyzers can be achieved by using an
[environment variable in your `.gitlab-ci.yml` ](index.md#customizing-the-dependency-scanning-settings ).
### Using a custom Docker mirror
You can switch to a custom Docker registry that provides the official analyzer
images under a different prefix. For instance, the following instructs Dependency
Scanning to pull `my-docker-registry/gl-images/gemnasium`
instead of `registry.gitlab.com/gitlab-org/security-products/analyzers/gemnasium` .
In `.gitlab-ci.yml` define:
```yaml
include:
template: Dependency-Scanning.gitlab-ci.yml
variables:
DS_ANALYZER_IMAGE_PREFIX: my-docker-registry/gl-images
```
This configuration requires that your custom registry provides images for all
the official analyzers.
### Selecting specific analyzers
You can select the official analyzers you want to run. Here's how to enable
`bundler-audit` and `gemnasium` while disabling all the other default ones.
In `.gitlab-ci.yml` define:
```yaml
include:
template: Dependency-Scanning.gitlab-ci.yml
variables:
DS_DEFAULT_ANALYZERS: "bundler-audit,gemnasium"
```
`bundler-audit` runs first. When merging the reports, Dependency Scanning will
remove the duplicates and will keep the `bundler-audit` entries.
### Disabling default analyzers
Setting `DS_DEFAULT_ANALYZERS` to an empty string will disable all the official
default analyzers. In `.gitlab-ci.yml` define:
```yaml
include:
template: Dependency-Scanning.gitlab-ci.yml
variables:
DS_DEFAULT_ANALYZERS: ""
```
That's needed when one totally relies on [custom analyzers ](#custom-analyzers ).
## Custom analyzers
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### Custom analyzers with Docker-in-Docker
When Docker-in-Docker for Dependency Scanning is enabled,
you can provide your own analyzers as a comma-separated list of Docker images.
Here's how to add `analyzers/nuget` and `analyzers/perl` to the default images.
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In `.gitlab-ci.yml` define:
```yaml
include:
template: Dependency-Scanning.gitlab-ci.yml
variables:
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DS_ANALYZER_IMAGES: "my-docker-registry/analyzers/nuget,amy-docker-registry/analyzers/perl"
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```
The values must be the full path to the container registry images,
like what you would feed to the `docker pull` command.
NOTE: **Note:**
This configuration doesn't benefit from the integrated detection step. Dependency
Scanning has to fetch and spawn each Docker image to establish whether the
custom analyzer can scan the source code.
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### Custom analyzers without Docker-in-Docker
When Docker-in-Docker for Dependency Scanning is disabled, you can provide your own analyzers by
defining CI jobs in your CI configuration. For consistency, you should suffix your custom Dependency
Scanning jobs with `-dependency_scanning` . Here's how to add a scanning job that's based on the
Docker image `my-docker-registry/analyzers/nuget` and generates a Dependency Scanning report
`gl-dependency-scanning-report.json` when `/analyzer run` is executed. Define the following in
`.gitlab-ci.yml` :
```yaml
nuget-dependency_scanning:
image:
name: "my-docker-registry/analyzers/nuget"
script:
- /analyzer run
artifacts:
reports:
dependency_scanning: gl-dependency-scanning-report.json
```
The [Security Scanner Integration ](../../../development/integrations/secure.md ) documentation explains how to integrate custom security scanners into GitLab.
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## Analyzers data
The following table lists the data available for each official analyzer.
| Property \ Tool | Gemnasium | bundler-audit | Retire.js |
|---------------------------------------|:------------------:|:------------------:|:------------------:|
| Severity | 𐄂 | ✓ | ✓ |
| Title | ✓ | ✓ | ✓ |
| File | ✓ | ⚠ | ✓ |
| Start line | 𐄂 | 𐄂 | 𐄂 |
| End line | 𐄂 | 𐄂 | 𐄂 |
| External ID (e.g., CVE) | ✓ | ✓ | ⚠ |
| URLs | ✓ | ✓ | ✓ |
| Internal doc/explanation | ✓ | 𐄂 | 𐄂 |
| Solution | ✓ | ✓ | 𐄂 |
| Confidence | 𐄂 | 𐄂 | 𐄂 |
| Affected item (e.g. class or package) | ✓ | ✓ | ✓ |
| Source code extract | 𐄂 | 𐄂 | 𐄂 |
| Internal ID | ✓ | 𐄂 | 𐄂 |
| Date | ✓ | 𐄂 | 𐄂 |
| Credits | ✓ | 𐄂 | 𐄂 |
- ✓ => we have that data
- ⚠ => we have that data but it's partially reliable, or we need to extract that data from unstructured content
- 𐄂 => we don't have that data or it would need to develop specific or inefficient/unreliable logic to obtain it.
The values provided by these tools are heterogeneous so they are sometimes
normalized into common values (e.g., `severity` , `confidence` , etc).
