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modules/age: add option to disable symlinking

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There are some cases where it may be better or even required to have the
secret be a file that is not a symlink. Setting

    age.secrets.some-secret.symlink = false;

will disable the default functionality of symlinking secrets and instead
just forcibly move them to their `path`.
This commit is contained in:
Cole Helbling 2021-11-08 09:45:34 -08:00
parent e538664435
commit 7bb0b5d7f1
2 changed files with 26 additions and 2 deletions
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16
README.md
View file

@ -193,6 +193,22 @@ randomness in `age`'s encryption algorithms, the files always change
when rekeyed, even if the identities do not. (This eventually could be
improved upon by reading the identities from the age file.)
## Don't symlink secret
If your secret cannot be a symlink, you should set the `symlink` option to `false`:
```nix
{
age.secrets.some-secret = {
file = ./secret;
path = "/var/lib/some-service/some-secret";
symlink = false;
};
}
```
Instead of first decrypting the secret to `/run/agenix` and then symlinking to its `path`, the secret will instead be forcibly moved to its `path`. Please note that, currently, there are no cleanup mechanisms for secrets that are not symlinked by agenix.
## Threat model/Warnings
This project has not be audited by a security professional.

12
modules/age.nix
View file

@ -16,7 +16,11 @@ let
identities = builtins.concatStringsSep " " (map (path: "-i ${path}") cfg.sshKeyPaths);
installSecret = secretType: ''
_truePath="${cfg.secretsMountPoint}/$_count/${secretType.name}"
${if secretType.symlink then ''
_truePath="${cfg.secretsMountPoint}/$_agenix_generation/${secretType.name}"
'' else ''
_truePath="${secretType.path}"
''}
echo "decrypting '${secretType.file}' to '$_truePath'..."
TMP_FILE="$_truePath.tmp"
mkdir -p "$(dirname "$_truePath")"
@ -28,7 +32,10 @@ let
chmod ${secretType.mode} "$TMP_FILE"
chown ${secretType.owner}:${secretType.group} "$TMP_FILE"
mv -f "$TMP_FILE" "$_truePath"
[ "${secretType.path}" != "/run/agenix/${secretType.name}" ] && ln -sfn "/run/agenix/${secretType.name}" "${secretType.path}"
${optionalString secretType.symlink ''
[ "${secretType.path}" != "/run/agenix/${secretType.name}" ] && ln -sfn "/run/agenix/${secretType.name}" "${secretType.path}"
''}
'';
isRootSecret = st: (st.owner == "root" || st.owner == "0") && (st.group == "root" || st.group == "0");
@ -83,6 +90,7 @@ let
Group of the file.
'';
};
symlink = mkEnableOption "symlinking secrets to their destination" // { default = true; };
};
});
in