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use crate::config::NodeConfig;
use crate::proto::{BACKUP_DIR, SNAPSHOT_DIR};
use crate::LocalNodeError;
use std::fs;
use std::io::BufRead;
use std::net::SocketAddr;
use std::path::Path;
use std::process::Command;
use argon2::Argon2;
use hmac::{Hmac, Mac};
use rand::Rng;
use sha2::Sha256;
use sys_mount::{Mount, UnmountFlags};
pub const MOUNTPOINTC: &str = "/mnt/hbak";
pub const MOUNTPOINTS: &str = "/mnt/hbakd";
/// Initializes the configuration file and local btrfs subvolumes.
pub fn init(
config_only: bool,
device: String,
bind_addr: Option<SocketAddr>,
node_name: String,
passphrase: String,
) -> Result<(), LocalNodeError> {
if Path::new(NodeConfig::PATH).exists() {
return Err(LocalNodeError::ConfigExists);
}
let node_config = NodeConfig {
device,
bind_addr,
node_name,
subvols: Vec::default(),
passphrase,
remotes: Vec::default(),
auth: Vec::default(),
};
node_config.save()?;
if !config_only {
init_btrfs(&node_config.device)?;
}
Ok(())
}
fn init_btrfs(device: &str) -> Result<(), LocalNodeError> {
fs::create_dir_all(MOUNTPOINTC)?;
fs::create_dir_all(MOUNTPOINTS)?;
let _btrfs = Mount::builder().data("compress=zstd").mount_autodrop(
device,
MOUNTPOINTC,
UnmountFlags::DETACH,
)?;
if !Command::new("btrfs")
.arg("subvolume")
.arg("create")
.arg(SNAPSHOT_DIR)
.spawn()?
.wait()?
.success()
{
return Err(LocalNodeError::BtrfsCmd);
}
if !Command::new("btrfs")
.arg("subvolume")
.arg("create")
.arg(BACKUP_DIR)
.spawn()?
.wait()?
.success()
{
return Err(LocalNodeError::BtrfsCmd);
}
Ok(())
}
/// Deinitializes the configuration file, optionally deleting the btrfs subvolumes.
pub fn deinit(remove_backups: bool) -> Result<(), LocalNodeError> {
if !Path::new(NodeConfig::PATH).exists() {
return Err(LocalNodeError::ConfigUninit);
}
if remove_backups {
deinit_btrfs()?;
}
fs::remove_file(NodeConfig::PATH)?;
Ok(())
}
fn deinit_btrfs() -> Result<(), LocalNodeError> {
fs::create_dir_all(MOUNTPOINTC)?;
fs::create_dir_all(MOUNTPOINTS)?;
let node_config = NodeConfig::load()?;
let _btrfs = Mount::builder().data("compress=zstd").mount_autodrop(
node_config.device,
MOUNTPOINTC,
UnmountFlags::DETACH,
)?;
if !Command::new("btrfs")
.arg("subvolume")
.arg("delete")
.arg(BACKUP_DIR)
.spawn()?
.wait()?
.success()
{
return Err(LocalNodeError::BtrfsCmd);
}
let output = Command::new("btrfs")
.arg("subvolume")
.arg("list")
.arg("-o")
.arg(SNAPSHOT_DIR)
.output()?;
if !output.status.success() {
return Err(LocalNodeError::BtrfsCmd);
}
let subvols = output.stdout.lines().map(|line| match line {
Ok(line) => Ok(Path::new(MOUNTPOINTC).join(
line.split_whitespace()
.next_back()
.expect("String splitting yields at least one item"),
)),
Err(e) => Err(e),
});
for subvol in subvols {
if !Command::new("btrfs")
.arg("subvolume")
.arg("delete")
.arg(subvol?)
.spawn()?
.wait()?
.success()
{
return Err(LocalNodeError::BtrfsCmd);
}
}
if !Command::new("btrfs")
.arg("subvolume")
.arg("delete")
.arg(SNAPSHOT_DIR)
.spawn()?
.wait()?
.success()
{
return Err(LocalNodeError::BtrfsCmd);
}
Ok(())
}
/// Provides a `Vec<u8>` of `n` random bytes. Uses the thread-local generator
/// of the `rand` crate.
pub fn random_bytes(n: usize) -> Vec<u8> {
rand::thread_rng()
.sample_iter(&rand::distributions::Standard)
.take(n)
.collect()
}
/// Performs an HMAC-SHA256 hash computation.
pub fn hash_hmac(secret: &[u8], data: &[u8]) -> Vec<u8> {
let mut mac: Hmac<Sha256> =
Hmac::new_from_slice(secret).expect("HMAC can take key of any size");
mac.update(data);
let hmac = mac.finalize();
hmac.into_bytes().to_vec()
}
/// Performs an Argon2id hash computation.
pub fn hash_argon2id<P: AsRef<[u8]>>(
okm: &mut [u8],
salt: &[u8],
passphrase: P,
) -> Result<(), LocalNodeError> {
Argon2::new(
argon2::Algorithm::Argon2id,
argon2::Version::default(),
argon2::Params::new(524288, 32, 128, Some(32))?,
)
.hash_password_into(passphrase.as_ref(), salt, okm)?;
Ok(())
}
/// Converts the provided passphrase into a key
/// suitable for node authentication or encryption using a random verifier.
///
/// This function wraps the [`derive_key`] function.
///
/// Returns the verifier and the HMAC hash in this order.
pub fn hash_passphrase<P: AsRef<[u8]>>(
passphrase: P,
) -> Result<(Vec<u8>, Vec<u8>), LocalNodeError> {
let verifier = random_bytes(32);
let key = derive_key(&verifier, passphrase)?;
Ok((verifier, key))
}
/// Converts the provided verifier and passphrase into a key
/// for node authentication or encryption.
pub fn derive_key<P: AsRef<[u8]>>(
verifier: &[u8],
passphrase: P,
) -> Result<Vec<u8>, LocalNodeError> {
let mut key_array = [0; 32];
hash_argon2id(&mut key_array, verifier, passphrase)?;
let key = hash_hmac(&key_array, verifier);
Ok(key)
}
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