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docs/content/en/about/security-model/index.md
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---
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title: Hugo's Security Model
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description: A summary of Hugo's security model.
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date: 2019-10-01
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layout: single
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keywords: ["Security", "Privacy"]
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menu:
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docs:
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parent: "about"
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weight: 4
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weight: 5
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sections_weight: 5
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draft: false
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aliases: [/security/]
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toc: true
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---
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## Runtime Security
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Hugo produces static output, so once built, the runtime is the browser (assuming the output is HTML) and any server (API) that you integrate with.
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But when developing and building your site, the runtime is the `hugo` executable. Securing a runtime can be [a real challenge](https://blog.logrocket.com/how-to-protect-your-node-js-applications-from-malicious-dependencies-5f2e60ea08f9/).
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**Hugo's main approach is that of sandboxing:**
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* Hugo has a virtual file system and only the main project (not third-party components) is allowed to mount directories or files outside the project root.
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* Only the main project can walk symbolic links.
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* User-defined components have only read-access to the filesystem.
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* We shell out to some external binaries to support [Asciidoctor](/content-management/formats/#list-of-content-formats) and simliar, but those binaries and their flags are predefined. General functions to run arbitrary external OS commands have been [discussed](https://github.com/gohugoio/hugo/issues/796), but not implemented because of security concerns.
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Hugo will soon introduce a concept of _Content Source Plugins_ (AKA _Pages from Data_), but the above will still hold true.
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## Dependency Security
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Hugo builds as a static binary using [Go Modules](https://github.com/golang/go/wiki/Modules) to manage its dependencies. Go Modules have several safeguards, one of them being the `go.sum` file. This is a database of the expected cryptographic checksums of all of your dependencies, including any transitive.
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[Hugo Modules](/hugo-modules/) is built on top of Go Modules functionality, and a Hugo project using Hugo Modules will have a `go.sum` file. We recommend that you commit this file to your version control system. The Hugo build will fail if there is a checksum mismatch, which would be an indication of [dependency tampering](https://julienrenaux.fr/2019/12/20/github-actions-security-risk/).
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## Web Application Security
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These are the security threats as defined by [OWASP](https://en.wikipedia.org/wiki/OWASP).
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For HTML output, this is the core security model:
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https://golang.org/pkg/html/template/#hdr-Security_Model
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In short:
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Templates authors (you) are trusted, but the data you send in is not.
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This is why you sometimes need to use the _safe_ functions, such as `safeHTML`, to avoid escaping of data you know is safe.
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There is one exception to the above, as noted in the documentation: If you enable inline shortcodes, you also say that the shortcodes and data handling in content files are trusted, as those macros are treated as pure text.
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It may be worth adding that Hugo is a static site generator with no concept of dynamic user input.
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For content, the default Markdown renderer is [configured](/getting-started/configuration-markup) to remove or escape potentially unsafe content. This behavior can be reconfigured if you trust your content.
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The `partialCached` template function can offer significant performance gains for complex templates that don't need to be re-rendered on every invocation.
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**Note:** Each Site (or language) has its own `partialCached` cache, so each site will execute a partial once.
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Here is the simplest usage:
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{{ partialCached "footer.html" . .Params.country .Params.province }}
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```
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Note that the variant parameters are not made available to the underlying partial template. They are only use to create a unique cache key.
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Note that the variant parameters are not made available to the underlying partial template. They are only use to create a unique cache key. Since Hugo `0.61.0` you can use any object as cache key(s), not just strings.
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> See also the [The Full Partial Series Part 1: Caching!](https://regisphilibert.com/blog/2019/12/hugo-partial-series-part-1-caching-with-partialcached/)
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