Merge pull request 'Add allow_world_readable_secrets option to config file' (#663) from PicNoir/garage:nin/world-readable-conf-file into main-0.8.x

Reviewed-on: Deuxfleurs/garage#663
This commit is contained in:
Alex 2024-01-15 15:20:16 +00:00
commit ee7fe27d3d
2 changed files with 89 additions and 5 deletions

View file

@ -323,6 +323,18 @@ be obtained by running `garage node id` and then included directly in the
key will be returned by `garage node id` and you will have to add the IP
yourself.
### `allow_world_readable_secrets`
Garage checks the permissions of your secret files to make sure
they're not world-readable. In some cases, the check might fail and
consider your files as world-readable even if they're not. Such as
when using Posix ACLs.
Setting `allow_world_readable_secrets` to `true` bypass this
permission verification.
Alternatively, you can set the `GARAGE_ALLOW_WORLD_READABLE_SECRETS`
environment variable to `true` to bypass the permissions check.
## The `[consul_discovery]` section

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@ -38,11 +38,15 @@ pub struct Config {
)]
pub compression_level: Option<i32>,
/// Skip the permission check of secret files. Useful when
/// POSIX ACLs (or more complex chmods) are used.
#[serde(default)]
pub allow_world_readable_secrets: bool,
/// 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
@ -223,16 +227,19 @@ pub fn read_config(config_file: PathBuf) -> Result<Config, Error> {
&mut parsed_config.rpc_secret,
&parsed_config.rpc_secret_file,
"rpc_secret",
parsed_config.allow_world_readable_secrets,
)?;
secret_from_file(
&mut parsed_config.admin.metrics_token,
&parsed_config.admin.metrics_token_file,
"admin.metrics_token",
parsed_config.allow_world_readable_secrets,
)?;
secret_from_file(
&mut parsed_config.admin.admin_token,
&parsed_config.admin.admin_token_file,
"admin.admin_token",
parsed_config.allow_world_readable_secrets,
)?;
Ok(parsed_config)
@ -260,6 +267,7 @@ fn secret_from_file(
secret: &mut Option<String>,
secret_file: &Option<String>,
name: &'static str,
conf_allow_world_readable: bool,
) -> Result<(), Error> {
match (&secret, &secret_file) {
(_, None) => {
@ -268,7 +276,37 @@ fn secret_from_file(
(Some(_), Some(_)) => {
return Err(format!("only one of `{}` and `{}_file` can be set", name, name).into());
}
(None, Some(file_path)) => *secret = Some(read_secret_file(file_path)?),
(None, Some(file_path)) => {
#[cfg(unix)]
// decide whether to ignore or check permission
// bits. GARAGE_ALLOW_WORLD_READABLE_SECRETS
// always takes precedence over what's specified
// in the config file, to allow overriding it in
// case the config file is read-only.
let ignore_perms = {
let ignore_perms_env = std::env::var("GARAGE_ALLOW_WORLD_READABLE_SECRETS");
if ignore_perms_env.as_deref() == Ok("true") {
true
} else if ignore_perms_env.as_deref() == Ok("false") {
false
} else {
conf_allow_world_readable
}
};
if !ignore_perms {
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(())
}
@ -427,11 +465,34 @@ mod tests {
"#,
path_secret_path.display()
)?;
let config = super::read_config(path_config.to_path_buf())?;
assert_eq!("foo", config.rpc_secret.unwrap());
// Second configuration file, same as previous one
// except it allows world-readable secrets.
let path_config_allow_world_readable = mktemp::Temp::new_file()?;
let mut file_config_allow_world_readable =
File::create(path_config_allow_world_readable.as_path())?;
writeln!(
file_config_allow_world_readable,
r#"
metadata_dir = "/tmp/garage/meta"
data_dir = "/tmp/garage/data"
replication_mode = "3"
rpc_bind_addr = "[::]:3901"
rpc_secret_file = "{}"
allow_world_readable_secrets = true
[s3_api]
s3_region = "garage"
api_bind_addr = "[::]:3900"
"#,
path_secret_path.display()
)?;
let mut config = super::read_config(path_config.to_path_buf())?;
assert_eq!("foo", config.rpc_secret.unwrap());
#[cfg(unix)]
{
// Check non world-readable secrets config
use std::os::unix::fs::PermissionsExt;
let metadata = std::fs::metadata(&path_secret_path)?;
let mut perm = metadata.permissions();
@ -443,8 +504,19 @@ mod tests {
std::env::set_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS", "true");
assert!(super::read_config(path_config.to_path_buf()).is_ok());
}
std::env::remove_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS");
// Check world-readable secrets config.
assert!(super::read_config(path_config_allow_world_readable.to_path_buf()).is_ok());
std::env::set_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS", "false");
assert!(super::read_config(path_config_allow_world_readable.to_path_buf()).is_err());
std::env::set_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS", "true");
assert!(super::read_config(path_config_allow_world_readable.to_path_buf()).is_ok());
}
std::env::remove_var("GARAGE_ALLOW_WORLD_READABLE_SECRETS");
drop(path_config);
drop(path_secret);
drop(file_config);