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add warning about caches as an attack vector #1268

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8 changes: 8 additions & 0 deletions source/guides/recipes/add-binary-cache.md
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Expand Up @@ -7,6 +7,14 @@ Nix can be configured to use a binary cache with the [`substituters`](https://ni
Follow the tutorial to [set up an HTTP binary cache](setup-http-binary-cache) and create a key pair for signing store objects.
:::

:::{warning}
Nix will accept any requested store object signed with private keys corresponding to the configured public keys.
Access to those private keys thus allows substituting arbitrary files into your Nix store.
This includes executables that may run with elevated privileges or automatically!

Only add public keys you trust unconditionally.
:::

For example, given a binary cache at `https://example.org` with public key `My56...Q==%`, and some derivation in `default.nix`, make Nix exclusively use that cache once by passing [settings as command line flags](https://nix.dev/manual/nix/latest/command-ref/conf-file#command-line-flags):

```shell-session
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