--- /dev/null
+++ b/docs/secrets.adoc
@@ -0,0 +1,35 @@
+= Fleet Secrets Management System
+
+== Overview
+
+Secret management system is a built-in way to deploy secrets to remote systems, similar to agenix and other similar systems.
+
+Secrets are encrypted using system's host ssh key (/etc/ssh/ssh_host_ed25519_key), which is not required to build the
+remote system/add secret to fleet configuration, fleet users are encrypting secrets using received public key instead,
+they don't need the root access to receive the public encryption key.
+
+== Example
+
+[source,nix]
+----
+{
+ fleet.secrets = {
+ "my-secret" = {
+ expectedOwners = [ "host1" "host2" ];
+ regenerateOnOwnerAdded = true;
+ generator = {mkImpureSecretGenerator}:
+ mkImpureSecretGenerator {
+ script = ''
+ echo "secret content" | gh private -o $out/secret
+ '';
+ };
+ };
+ }
+}
+----
+
+== Limitations and Future Improvements
+
+- Pure secret generators are currently disabled
+- Support for other secret management systems (e.g systemd-creds has planned asymmetric encryption support)
+
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -33,16 +33,30 @@
inherit (options) mkHostsOption;
modules = {
- # mkDefault = mkOverride 1000
- # For places, where fleet knows better than nixpkgs defaults.
+ /**
+ Use in places, where fleet might know better than nixpkgs defaults to
+ */
mkFleetDefault = mkOverride 999;
- # Some generators use mkDefault, but optionDefault is set by nixpkgs.
+ /**
+ Some generators use mkDefault, but optionDefault is set by nixpkgs.
+ */
mkFleetGeneratorDefault = mkOverride 1001;
};
inherit (modules) mkFleetDefault mkFleetGeneratorDefault;
secrets = {
+ /**
+ Generate a random secret password, 32 ascii characters by default
+
+ Options:
+ size: generated password length in ascii characters (bytes).
+ noSymbols: by default, character set includes various special characters ($ , ! + * : ~), and might
+ not be accepted in some contexts, this option switches charset to just [A-Za-z0-9].
+
+ Output:
+ Resulting secret has only part: secret, which contains encrypted password.
+ */
mkPassword = {size ? 32}: {
coreutils,
mkSecretGenerator,
@@ -54,6 +68,19 @@
'';
};
+ /**
+ Generate a random ed25519 keypair
+
+ Options:
+ noEmbedPublic: By default, secret key also embeds public key in itself ("extended" format, 64 bytes)
+ When noEmbedPublis is enabled - only the private scalar is included.
+ encoding: Encoring of public and secret parts, can be "raw" (default), "base64" or "hex".
+
+ Output:
+ Resulting secret has two parts: public and secret, where the secret part is encrypted.
+
+ This secret format is used by e.g Garage S3 server
+ */
mkEd25519 = {
noEmbedPublic ? false,
encoding ? null,
@@ -67,6 +94,17 @@
'';
};
+ /**
+ Generate a random x25519 keypair
+
+ Options:
+ encoding: Encoring of public and secret parts, can be "raw" (default), "base64" or "hex".
+
+ Output:
+ Resulting secret has two parts: public and secret, where the secret part is encrypted.
+
+ This secret format is used by e.g Wireguard VPN for peers (base64-encoded)
+ */
mkX25519 = {encoding ? null}: {mkSecretGenerator}:
mkSecretGenerator {
script = ''
@@ -76,6 +114,16 @@
'';
};
+ /**
+ Generate a random RSA keypair
+
+ Options:
+ size: RSA key size, 4096 by default
+
+ Output:
+ Resulting secret has two parts: public and secret, where the secret part is encrypted.
+ Both parts are PEM encoded.
+ */
mkRsa = {size ? 4096}: {
openssl,
mkSecretGenerator,
@@ -92,6 +140,20 @@
'';
};
+ /**
+ Generate a random byte sequence
+
+ Options:
+ size: generated password length in bytes, 32 by default.
+ encoding: how the generated bytes should be encoded, "raw" (default), "hex" or "base64"
+ noNuls: prevent output byte sequence from containing internal \0, useful for some C applications
+ that can't handle their strings properly.
+
+ Output:
+ Resulting secret has only part: secret, which contains encrypted bytes.
+
+ Might be used for e.g. Wireguard VPN PSK keys (base64-encoded)
+ */
mkBytes = {
count ? 32,
encoding,
@@ -104,11 +166,17 @@
${optionalString noNuls "--no-nuls"}
'';
};
+ /**
+ Shorthand for `mkBytes`, which defaults to "hex" encoding
+ */
mkHexBytes = {count ? 32}:
mkBytes {
inherit count;
encoding = "hex";
};
+ /**
+ Shorthand for `mkBytes`, which defaults to "base64" encoding
+ */
mkBase64Bytes = {count ? 32}:
mkBytes {
inherit count;
@@ -126,6 +194,9 @@
plaintextPrefix = "<PLAINTEXT>";
plaintextNewlinePrefix = "<PLAINTEXT-NL>";
in {
+ /**
+ Decode public secret part into string
+ */
decodeRawSecret = raw:
if hasPrefix plaintextPrefix raw
then removePrefix plaintextPrefix raw
--- a/modules/hosts.nix
+++ b/modules/hosts.nix
@@ -11,6 +11,8 @@
inherit (lib.attrsets) mapAttrsToList mapAttrs;
inherit (lib.lists) flatten groupBy;
in {
+ # Fleet Meta Configuration Module
+
options = {
data = mkOption {
type = mkDataType {
@@ -18,74 +20,94 @@
version = mkOption {
type = str;
internal = true;
+ description = "Internal version identifier for saved fleet state";
};
+
gcRootPrefix = mkOption {
type = str;
internal = true;
+ description = "Prefix for fleet-generated gc garbage collection roots";
};
+
hosts = mkOption {
type = attrsOf (submodule {
options.encryptionKey = mkOption {
type = str;
- description = "Rage SSH encryption key for secrets.";
+ description = "Rage SSH encryption key for host-bound secrets";
};
});
};
};
};
description = ''
- Configuration provided from outside.
- Usually used to persist fleet data between runs.
+ Persistent configuration data for fleet management.
+ Typically used to maintain state between fleet configuration runs.
'';
};
+
taggedWith = mkOption {
type = attrsOf (listOf str);
internal = true;
+ description = "Mapping of hosts grouped by tags, used by fleet CLI";
};
+
hosts = mkOption {
type = mkHostsType ({config, ...}: {
options = {
system = mkOption {
- description = "Type of the system.";
+ description = "System architecture and platform identifier";
type = str;
example = "x86_64-linux";
};
+
tags = mkOption {
- description = "Host tag. In CLI, you can refer to all hosts having this tag using @tag syntax.";
+ description = ''
+ Tags for host classification.
+ Used for host selection via @tag syntax in CLI tools.
+ '';
type = listOf str;
};
+
+ # Network configuration details
network = mkOption {
type = submodule {
options = {
internalIps = mkOption {
- description = "Internal ips";
+ description = "List of internal IP addresses for the host";
type = listOf str;
default = [];
};
+
externalIps = mkOption {
- description = "External ips";
+ description = "List of external IP addresses for the host";
type = listOf str;
default = [];
};
};
};
- description = "Network definition of host";
};
};
config = {
+ # Default hostname generation
nixos.networking.hostName = mkFleetGeneratorDefault config._module.args.name;
+ # Default 'all' tag for every host
tags = ["all"];
};
_file = ./meta.nix;
});
default = {};
- description = "Configurations of individual hosts";
};
};
+
+ # Generate a mapping of hosts indexed by their tags
config.taggedWith = let
+ # Flatten host tags into a list of {hostname, tag} pairs
hostTagList = flatten (mapAttrsToList (hostname: host: map (tag: {inherit hostname tag;}) host.tags) config.hosts);
+ # Group hostnames by their tags
grouped = mapAttrs (_: hosts: lib.map (pair: pair.hostname) hosts) (groupBy (elem: elem.tag) hostTagList);
in
grouped;
+
+ # Source file reference
_file = ./meta.nix;
}
--- a/modules/secrets-data.nix
+++ b/modules/secrets-data.nix
@@ -15,7 +15,7 @@
options = {
raw = mkOption {
type = nullOr str;
- description = "Encrypted + encoded secret data";
+ description = "Raw secret data in unspecified encoded and optionally encrypted format.";
default = null;
};
};
@@ -26,29 +26,28 @@
options = {
createdAt = mkOption {
type = str;
- description = "When this secret was (re)generated";
+ description = "Timestamp of secret generation/last rotation.";
default = null;
};
expiresAt = mkOption {
type = nullOr str;
- description = "On which date this secret will expire, someone should regenerate this secret before it expires.";
+ description = "Expiration timestamp triggering mandatory secret rotation.";
default = null;
};
owners = mkOption {
type = listOf str;
description = ''
- For which owners this secret is currently encrypted,
- if not matches expectedOwners - then this secret is considered outdated, and
- should be regenerated/reencrypted.
+ List of hosts currently authorized to decrypt this shared secret.
- Imported from fleet.nix
+ If owners differ from expected owners, the secret is considered outdated
+ and requires regeneration or re-encryption.
'';
default = [];
};
generationData = mkOption {
type = unspecified;
- description = "Data that is embedded into secret part";
+ description = "Contextual metadata associated with secret part.";
default = null;
};
};
@@ -60,22 +59,22 @@
options = {
createdAt = mkOption {
type = str;
- description = "When this secret was (re)generated";
+ description = "Timestamp of secret generation/last rotation.";
default = null;
};
expiresAt = mkOption {
type = nullOr str;
- description = "On which date this secret will expire, someone should regenerate this secret before it expires.";
+ description = "Expiration timestamp triggering mandatory secret rotation.";
default = null;
};
shared = mkOption {
type = bool;
- description = "On which date this secret will expire, someone should regenerate this secret before it expires.";
+ description = "Indicates if secret is a shared secret, so other hosts might have the same piece of secret data.";
default = false;
};
generationData = mkOption {
type = unspecified;
- description = "Data that is embedded into secret part";
+ description = "Contextual metadata associated with secret part.";
default = null;
};
};
@@ -87,12 +86,12 @@
sharedSecrets = mkOption {
type = attrsOf (submodule sharedSecretData);
default = {};
- description = "Stored shared secret data.";
+ description = "Shared secret data.";
};
hostSecrets = mkOption {
type = attrsOf (attrsOf (submodule hostSecretData));
default = {};
- description = "Host secrets.";
+ description = "Host-specific secrets.";
internal = true;
};
};