68 lines
3.4 KiB
Markdown
68 lines
3.4 KiB
Markdown
# Proxying assets
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A possible security concern when managing a public facing GitLab instance is
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the ability to steal a users IP address by referencing images in issues, comments, etc.
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For example, adding `` to
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an issue description will cause the image to be loaded from the external
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server in order to be displayed. However, this also allows the external server
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to log the IP address of the user.
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One way to mitigate this is by proxying any external images to a server you
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control.
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GitLab can be configured to use an asset proxy server when requesting external images/videos in
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issues, comments, etc. This helps ensure that malicious images do not expose the user's IP address
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when they are fetched.
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We currently recommend using [cactus/go-camo](https://github.com/cactus/go-camo#how-it-works)
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as it supports proxying video and is more configurable.
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## Installing Camo server
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A Camo server is used to act as the proxy.
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To install a Camo server as an asset proxy:
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1. Deploy a `go-camo` server. Helpful instructions can be found in
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[building catus/go-camo](https://github.com/cactus/go-camo#building).
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1. Make sure your instance of GitLab is running, and that you have created a private API token.
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Using the API, configure the asset proxy settings on your GitLab instance. For example:
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```sh
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curl --request "PUT" "https://gitlab.example.com/api/v4/application/settings?\
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asset_proxy_enabled=true&\
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asset_proxy_url=https://proxy.gitlab.example.com&\
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asset_proxy_secret_key=<somekey>" \
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--header 'PRIVATE-TOKEN: <my_private_token>'
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```
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The following settings are supported:
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| Attribute | Description |
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|:-------------------------|:-------------------------------------------------------------------------------------------------------------------------------------|
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| `asset_proxy_enabled` | Enable proxying of assets. If enabled, requires: `asset_proxy_url`). |
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| `asset_proxy_secret_key` | Shared secret with the asset proxy server. |
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| `asset_proxy_url` | URL of the asset proxy server. |
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| `asset_proxy_whitelist` | Assets that match these domain(s) will NOT be proxied. Wildcards allowed. Your GitLab installation URL is automatically whitelisted. |
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1. Restart the server for the changes to take effect. Each time you change any values for the asset
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proxy, you need to restart the server.
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## Using the Camo server
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Once the Camo server is running and you've enabled the GitLab settings, any image or video that
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references an external source will get proxied to the Camo server.
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For example, the following is a link to an image in Markdown:
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```markdown
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```
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The following is an example of a source link that could result:
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```text
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http://proxy.gitlab.example.com/f9dd2b40157757eb82afeedbf1290ffb67a3aeeb/68747470733a2f2f61626f75742e6769746c61622e636f6d2f696d616765732f70726573732f6c6f676f2f6a70672f6769746c61622d69636f6e2d7267622e6a7067
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```
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