garage/src/util/config.rs
2023-02-06 12:23:55 +01:00

407 lines
11 KiB
Rust

//! Contains type and functions related to Garage configuration file
use std::io::Read;
use std::net::SocketAddr;
use std::path::PathBuf;
use serde::{de, Deserialize};
use crate::error::Error;
/// Represent the whole configuration
#[derive(Deserialize, Debug, Clone)]
pub struct Config {
/// Path where to store metadata. Should be fast, but low volume
pub metadata_dir: PathBuf,
/// Path where to store data. Can be slower, but need higher volume
pub data_dir: PathBuf,
/// Size of data blocks to save to disk
#[serde(default = "default_block_size")]
pub block_size: usize,
/// Replication mode. Supported values:
/// - none, 1 -> no replication
/// - 2 -> 2-way replication
/// - 3 -> 3-way replication
// (we can add more aliases for this later)
pub replication_mode: String,
/// Zstd compression level used on data blocks
#[serde(
deserialize_with = "deserialize_compression",
default = "default_compression"
)]
pub compression_level: Option<i32>,
/// RPC secret key: 32 bytes hex encoded
pub rpc_secret: Option<String>,
/// Optional file where RPC secret key is read from
pub rpc_secret_file: Option<String>,
/// Address to bind for RPC
pub rpc_bind_addr: SocketAddr,
/// Public IP address of this node
pub rpc_public_addr: Option<String>,
/// Timeout for Netapp's ping messagess
pub rpc_ping_timeout_msec: Option<u64>,
/// Timeout for Netapp RPC calls
pub rpc_timeout_msec: Option<u64>,
// -- Bootstraping and discovery
/// Bootstrap peers RPC address
#[serde(default)]
pub bootstrap_peers: Vec<String>,
/// Configuration for automatic node discovery through Consul
#[serde(default)]
pub consul_discovery: Option<ConsulDiscoveryConfig>,
/// Configuration for automatic node discovery through Kubernetes
#[serde(default)]
pub kubernetes_discovery: Option<KubernetesDiscoveryConfig>,
// -- DB
/// Database engine to use for metadata (options: sled, sqlite, lmdb)
#[serde(default = "default_db_engine")]
pub db_engine: String,
/// Sled cache size, in bytes
#[serde(default = "default_sled_cache_capacity")]
pub sled_cache_capacity: u64,
/// Sled flush interval in milliseconds
#[serde(default = "default_sled_flush_every_ms")]
pub sled_flush_every_ms: u64,
// -- APIs
/// Configuration for S3 api
pub s3_api: S3ApiConfig,
/// Configuration for K2V api
pub k2v_api: Option<K2VApiConfig>,
/// Configuration for serving files as normal web server
pub s3_web: Option<WebConfig>,
/// Configuration for the admin API endpoint
#[serde(default = "Default::default")]
pub admin: AdminConfig,
}
/// Configuration for S3 api
#[derive(Deserialize, Debug, Clone)]
pub struct S3ApiConfig {
/// Address and port to bind for api serving
pub api_bind_addr: Option<SocketAddr>,
/// S3 region to use
pub s3_region: String,
/// Suffix to remove from domain name to find bucket. If None,
/// vhost-style S3 request are disabled
pub root_domain: Option<String>,
}
/// Configuration for K2V api
#[derive(Deserialize, Debug, Clone)]
pub struct K2VApiConfig {
/// Address and port to bind for api serving
pub api_bind_addr: SocketAddr,
}
/// Configuration for serving files as normal web server
#[derive(Deserialize, Debug, Clone)]
pub struct WebConfig {
/// Address and port to bind for web serving
pub bind_addr: SocketAddr,
/// Suffix to remove from domain name to find bucket
pub root_domain: String,
}
/// Configuration for the admin and monitoring HTTP API
#[derive(Deserialize, Debug, Clone, Default)]
pub struct AdminConfig {
/// Address and port to bind for admin API serving
pub api_bind_addr: Option<SocketAddr>,
/// Bearer token to use to scrape metrics
pub metrics_token: Option<String>,
/// File to read metrics token from
pub metrics_token_file: Option<String>,
/// Bearer token to use to access Admin API endpoints
pub admin_token: Option<String>,
/// File to read admin token from
pub admin_token_file: Option<String>,
/// OTLP server to where to export traces
pub trace_sink: Option<String>,
}
#[derive(Deserialize, Debug, Clone)]
pub struct ConsulDiscoveryConfig {
/// Consul http or https address to connect to to discover more peers
pub consul_http_addr: String,
/// Consul service name to use
pub service_name: String,
/// CA TLS certificate to use when connecting to Consul
pub ca_cert: Option<String>,
/// Client TLS certificate to use when connecting to Consul
pub client_cert: Option<String>,
/// Client TLS key to use when connecting to Consul
pub client_key: Option<String>,
/// Skip TLS hostname verification
#[serde(default)]
pub tls_skip_verify: bool,
}
#[derive(Deserialize, Debug, Clone)]
pub struct KubernetesDiscoveryConfig {
/// Kubernetes namespace the service discovery resources are be created in
pub namespace: String,
/// Service name to filter for in k8s custom resources
pub service_name: String,
/// Skip creation of the garagenodes CRD
#[serde(default)]
pub skip_crd: bool,
}
fn default_db_engine() -> String {
"sled".into()
}
fn default_sled_cache_capacity() -> u64 {
128 * 1024 * 1024
}
fn default_sled_flush_every_ms() -> u64 {
2000
}
fn default_block_size() -> usize {
1048576
}
/// Read and parse configuration
pub fn read_config(config_file: PathBuf) -> Result<Config, Error> {
let mut file = std::fs::OpenOptions::new()
.read(true)
.open(config_file.as_path())?;
let mut config = String::new();
file.read_to_string(&mut config)?;
let mut parsed_config: Config = toml::from_str(&config)?;
secret_from_file(
&mut parsed_config.rpc_secret,
&parsed_config.rpc_secret_file,
"rpc_secret",
)?;
secret_from_file(
&mut parsed_config.admin.metrics_token,
&parsed_config.admin.metrics_token_file,
"admin.metrics_token",
)?;
secret_from_file(
&mut parsed_config.admin.admin_token,
&parsed_config.admin.admin_token_file,
"admin.admin_token",
)?;
Ok(parsed_config)
}
fn secret_from_file(
secret: &mut Option<String>,
secret_file: &Option<String>,
name: &'static str,
) -> Result<(), Error> {
match (&secret, &secret_file) {
(_, None) => {
// no-op
}
(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()));
}
}
Ok(())
}
fn default_compression() -> Option<i32> {
Some(1)
}
fn deserialize_compression<'de, D>(deserializer: D) -> Result<Option<i32>, D::Error>
where
D: de::Deserializer<'de>,
{
use std::convert::TryFrom;
struct OptionVisitor;
impl<'de> serde::de::Visitor<'de> for OptionVisitor {
type Value = Option<i32>;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
formatter.write_str("int or 'none'")
}
fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
if value.eq_ignore_ascii_case("none") {
Ok(None)
} else {
Err(E::custom(format!(
"Invalid compression level: '{}', should be a number, or 'none'",
value
)))
}
}
fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>
where
E: de::Error,
{
i32::try_from(v)
.map(Some)
.map_err(|_| E::custom("Compression level out of bound".to_owned()))
}
fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>
where
E: de::Error,
{
i32::try_from(v)
.map(Some)
.map_err(|_| E::custom("Compression level out of bound".to_owned()))
}
}
deserializer.deserialize_any(OptionVisitor)
}
#[cfg(test)]
mod tests {
use crate::error::Error;
use std::fs::File;
use std::io::Write;
#[test]
fn test_rpc_secret() -> Result<(), Error> {
let path2 = mktemp::Temp::new_file()?;
let mut file2 = File::create(path2.as_path())?;
writeln!(
file2,
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
rpc_bind_addr = "[::]:3901"
rpc_secret = "foo"
[s3_api]
s3_region = "garage"
api_bind_addr = "[::]:3900"
"#
)?;
let config = super::read_config(path2.to_path_buf())?;
assert_eq!("foo", config.rpc_secret.unwrap());
drop(path2);
drop(file2);
Ok(())
}
#[test]
fn test_rpc_secret_file_works() -> Result<(), Error> {
let path_secret = mktemp::Temp::new_file()?;
let mut file_secret = File::create(path_secret.as_path())?;
writeln!(file_secret, "foo")?;
drop(file_secret);
let path_config = mktemp::Temp::new_file()?;
let mut file_config = File::create(path_config.as_path())?;
let path_secret_path = path_secret.as_path();
writeln!(
file_config,
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
rpc_bind_addr = "[::]:3901"
rpc_secret_file = "{}"
[s3_api]
s3_region = "garage"
api_bind_addr = "[::]:3900"
"#,
path_secret_path.display()
)?;
let config = super::read_config(path_config.to_path_buf())?;
assert_eq!("foo", config.rpc_secret.unwrap());
#[cfg(unix)]
{
use std::os::unix::fs::PermissionsExt;
let metadata = std::fs::metadata(&path_secret_path)?;
let mut perm = metadata.permissions();
perm.set_mode(0o660);
std::fs::set_permissions(&path_secret_path, perm)?;
std::env::set_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS", "false");
assert!(super::read_config(path_config.to_path_buf()).is_err());
std::env::set_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS", "true");
assert!(super::read_config(path_config.to_path_buf()).is_ok());
}
drop(path_config);
drop(path_secret);
drop(file_config);
Ok(())
}
#[test]
fn test_rcp_secret_and_rpc_secret_file_cannot_be_set_both() -> Result<(), Error> {
let path_config = mktemp::Temp::new_file()?;
let mut file_config = File::create(path_config.as_path())?;
writeln!(
file_config,
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
rpc_bind_addr = "[::]:3901"
rpc_secret= "dummy"
rpc_secret_file = "dummy"
[s3_api]
s3_region = "garage"
api_bind_addr = "[::]:3900"
"#
)?;
assert_eq!(
"only one of `rpc_secret` and `rpc_secret_file` can be set",
super::read_config(path_config.to_path_buf())
.unwrap_err()
.to_string()
);
drop(path_config);
drop(file_config);
Ok(())
}
}