Merge pull request 'Add support for specifying rpc_secret_file, metrics_token_file and admin_token_file using environment variables' (#643) from networkException/garage:token-file-env into main-0.8.x

Reviewed-on: Deuxfleurs/garage#643

doc/book/reference-manual/configuration.md

@@ -276,7 +276,7 @@ Compression is done synchronously, setting a value too high will add latency to
 This value can be different between nodes, compression is done by the node which receive the
 API call.
 
-### `rpc_secret`, `rpc_secret_file` or `GARAGE_RPC_SECRET` (env)
+### `rpc_secret`, `rpc_secret_file` or `GARAGE_RPC_SECRET`, `GARAGE_RPC_SECRET_FILE` (env)
 
 Garage uses a secret key, called an RPC secret, that is shared between all
 nodes of the cluster in order to identify these nodes and allow them to
@@ -288,6 +288,9 @@ Since Garage `v0.8.2`, the RPC secret can also be stored in a file whose path is
 given in the configuration variable `rpc_secret_file`, or specified as an
 environment variable `GARAGE_RPC_SECRET`.
 
+Since Garage `v0.9.0`, you can also specify the path of a file storing the secret
+as the `GARAGE_RPC_SECRET_FILE` environment variable.
+
 ### `rpc_bind_addr`
 
 The address and port on which to bind for inter-cluster communcations
@@ -465,7 +468,7 @@ See [administration API reference](@/documentation/reference-manual/admin-api.md
 Alternatively, since `v0.8.5`, a path can be used to create a unix socket. Note that for security reasons,
 the socket will have 0220 mode. Make sure to set user and group permissions accordingly.
 
-### `metrics_token`, `metrics_token_file` or `GARAGE_METRICS_TOKEN` (env)
+### `metrics_token`, `metrics_token_file` or `GARAGE_METRICS_TOKEN`, `GARAGE_METRICS_TOKEN_FILE` (env)
 
 The token for accessing the Metrics endpoint. If this token is not set, the
 Metrics endpoint can be accessed without access control.
@@ -475,8 +478,9 @@ You can use any random string for this value. We recommend generating a random t
 `metrics_token` was introduced in Garage `v0.7.2`.
 `metrics_token_file` and the `GARAGE_METRICS_TOKEN` environment variable are supported since Garage `v0.8.2`.
 
+`GARAGE_METRICS_TOKEN_FILE` is supported since `v0.9.0`.
 
-### `admin_token`, `admin_token_file` or `GARAGE_ADMIN_TOKEN` (env)
+### `admin_token`, `admin_token_file` or `GARAGE_ADMIN_TOKEN`, `GARAGE_ADMIN_TOKEN_FILE` (env)
 
 The token for accessing all of the other administration endpoints.  If this
 token is not set, access to these endpoints is disabled entirely.
@@ -486,6 +490,7 @@ You can use any random string for this value. We recommend generating a random t
 `admin_token` was introduced in Garage `v0.7.2`.
 `admin_token_file` and the `GARAGE_ADMIN_TOKEN` environment variable are supported since Garage `v0.8.2`.
 
+`GARAGE_ADMIN_TOKEN_FILE` is supported since `v0.9.0`.
 
 ### `trace_sink`
 

src/garage/main.rs

@@ -25,7 +25,7 @@ use structopt::StructOpt;
 use netapp::util::parse_and_resolve_peer_addr;
 use netapp::NetworkKey;
 
-use garage_util::config::Config;
+use garage_util::config::{read_secret_file, Config};
 use garage_util::error::*;
 
 use garage_rpc::system::*;
@@ -70,15 +70,30 @@ pub struct Secrets {
 	#[structopt(short = "s", long = "rpc-secret", env = "GARAGE_RPC_SECRET")]
 	pub rpc_secret: Option<String>,
 
-	/// Metrics API authentication token, replaces admin.metrics_token in config.toml when
+	/// RPC secret network key, used to replace rpc_secret in config.toml and rpc-secret
+	/// when running the daemon or doing admin operations
+	#[structopt(long = "rpc-secret-file", env = "GARAGE_RPC_SECRET_FILE")]
+	pub rpc_secret_file: Option<String>,
+
+	/// Admin API authentication token, replaces admin.admin_token in config.toml when
 	/// running the Garage daemon
 	#[structopt(long = "admin-token", env = "GARAGE_ADMIN_TOKEN")]
 	pub admin_token: Option<String>,
 
+	/// Admin API authentication token file path, replaces admin.admin_token in config.toml
+	/// and admin-token when running the Garage daemon
+	#[structopt(long = "admin-token-file", env = "GARAGE_ADMIN_TOKEN_FILE")]
+	pub admin_token_file: Option<String>,
+
 	/// Metrics API authentication token, replaces admin.metrics_token in config.toml when
 	/// running the Garage daemon
 	#[structopt(long = "metrics-token", env = "GARAGE_METRICS_TOKEN")]
 	pub metrics_token: Option<String>,
+
+	/// Metrics API authentication token file path, replaces admin.metrics_token in config.toml
+	/// and metrics-token when running the Garage daemon
+	#[structopt(long = "metrics-token-file", env = "GARAGE_METRICS_TOKEN_FILE")]
+	pub metrics_token_file: Option<String>,
 }
 
 #[tokio::main]
@@ -259,15 +274,24 @@ async fn cli_command(opt: Opt) -> Result<(), Error> {
 	}
 }
 
-fn fill_secrets(mut config: Config, secrets: Secrets) -> Config {
+fn fill_secrets(mut config: Config, secrets: Secrets) -> Result<Config, Error> {
 	if secrets.rpc_secret.is_some() {
 		config.rpc_secret = secrets.rpc_secret;
+	} else if secrets.rpc_secret_file.is_some() {
+		config.rpc_secret = Some(read_secret_file(&secrets.rpc_secret_file.unwrap())?);
 	}
+
 	if secrets.admin_token.is_some() {
 		config.admin.admin_token = secrets.admin_token;
+	} else if secrets.admin_token_file.is_some() {
+		config.admin.admin_token = Some(read_secret_file(&secrets.admin_token_file.unwrap())?);
 	}
+
 	if secrets.metrics_token.is_some() {
 		config.admin.metrics_token = secrets.metrics_token;
+	} else if secrets.metrics_token_file.is_some() {
+		config.admin.metrics_token = Some(read_secret_file(&secrets.metrics_token_file.unwrap())?);
 	}
-	config
+
+	Ok(config)
 }

src/garage/repair/offline.rs

@@ -20,7 +20,7 @@ pub async fn offline_repair(
 	}
 
 	info!("Loading configuration...");
-	let config = fill_secrets(read_config(config_file)?, secrets);
+	let config = fill_secrets(read_config(config_file)?, secrets)?;
 
 	info!("Initializing Garage main data store...");
 	let garage = Garage::new(config)?;

src/garage/server.rs

@@ -29,7 +29,7 @@ async fn wait_from(mut chan: watch::Receiver<bool>) {
 
 pub async fn run_server(config_file: PathBuf, secrets: Secrets) -> Result<(), Error> {
 	info!("Loading configuration...");
-	let config = fill_secrets(read_config(config_file)?, secrets);
+	let config = fill_secrets(read_config(config_file)?, secrets)?;
 
 	// ---- Initialize Garage internals ----
 

src/util/config.rs

@@ -238,6 +238,24 @@ pub fn read_config(config_file: PathBuf) -> Result<Config, Error> {
 	Ok(parsed_config)
 }
 
+pub fn read_secret_file(file_path: &String) -> Result<String, Error> {
+	#[cfg(unix)]
+	if std::env::var("GARAGE_ALLOW_WORLD_READABLE_SECRETS").as_deref() != Ok("true") {
+		use std::os::unix::fs::MetadataExt;
+		let metadata = std::fs::metadata(file_path)?;
+		if metadata.mode() & 0o077 != 0 {
+			return Err(format!("File {} is world-readable! (mode: 0{:o}, expected 0600)\nRefusing to start until this is fixed, or environment variable GARAGE_ALLOW_WORLD_READABLE_SECRETS is set to true.", file_path, metadata.mode()).into());
+		}
+	}
+	let mut file = std::fs::OpenOptions::new().read(true).open(file_path)?;
+	let mut secret_buf = String::new();
+	file.read_to_string(&mut secret_buf)?;
+
+	// trim_end: allows for use case such as `echo "$(openssl rand -hex 32)" > somefile`.
+	//           also editors sometimes add a trailing newline
+	Ok(String::from(secret_buf.trim_end()))
+}
+
 fn secret_from_file(
 	secret: &mut Option<String>,
 	secret_file: &Option<String>,
@@ -250,22 +268,7 @@ fn secret_from_file(
 		(Some(_), Some(_)) => {
 			return Err(format!("only one of `{}` and `{}_file` can be set", name, name).into());
 		}
-		(None, Some(file_path)) => {
-			#[cfg(unix)]
-			if std::env::var("GARAGE_ALLOW_WORLD_READABLE_SECRETS").as_deref() != Ok("true") {
-				use std::os::unix::fs::MetadataExt;
-				let metadata = std::fs::metadata(file_path)?;
-				if metadata.mode() & 0o077 != 0 {
-					return Err(format!("File {} is world-readable! (mode: 0{:o}, expected 0600)\nRefusing to start until this is fixed, or environment variable GARAGE_ALLOW_WORLD_READABLE_SECRETS is set to true.", file_path, metadata.mode()).into());
-				}
-			}
-			let mut file = std::fs::OpenOptions::new().read(true).open(file_path)?;
-			let mut secret_buf = String::new();
-			file.read_to_string(&mut secret_buf)?;
-			// trim_end: allows for use case such as `echo "$(openssl rand -hex 32)" > somefile`.
-			//           also editors sometimes add a trailing newline
-			*secret = Some(String::from(secret_buf.trim_end()));
-		}
+		(None, Some(file_path)) => *secret = Some(read_secret_file(file_path)?),
 	}
 	Ok(())
 }