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shimunn 2019-09-14 22:55:34 +02:00
commit ea5be597fd
Signed by: shimun
GPG Key ID: E81D8382DC2F971B
5 changed files with 860 additions and 0 deletions

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20
Cargo.toml Normal file
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@ -0,0 +1,20 @@
[package]
name = "fido2-luks"
version = "0.1.0"
authors = ["shimunn <shimun@shimun.net>"]
edition = "2018"
[dependencies]
ctap = { git = "https://git.shimun.net/shimun/ctap.git", branch = "hmac_ext" }
cryptsetup-rs = "0.2.0"
hex = "0.3.2"
rust-crypto = "0.2.36"
failure = "0.1.5"
serde_derive = "1.0.100"
serde = "1.0.100"
serde_json = "1.0.40"
[profile.release]
lto = true
opt-level = 'z'

49
src/error.rs Normal file
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@ -0,0 +1,49 @@
use std::io;
use ctap::FidoError;
pub type Fido2LuksResult<T> = Result<T, Fido2LuksError>;
#[derive(Debug, Fail)]
pub enum Fido2LuksError {
#[fail(display = "unable to retrieve password: {}", cause)]
AskPassError{ cause: io::Error },
#[fail(display = "unable to read keyfile: {}", cause)]
KeyfileError { cause: io::Error },
#[fail(display = "authenticator error: {}", cause)]
AuthenticatorError { cause: ctap::FidoError },
#[fail(display = "no authenticator found, please ensure you device is plugged in")]
NoAuthenticatorError,
#[fail(display = "no authenticator found, please ensure you device is plugged in")]
LuksError { cause: cryptsetup_rs::device::Error },
#[fail(display = "no authenticator found, please ensure you device is plugged in")]
IoError { cause: io::Error },
#[fail(display = "failed to parse config, please check formatting and contents")]
ConfigurationError { cause: serde_json::error::Error },
}
use Fido2LuksError::*;
impl From<FidoError> for Fido2LuksError {
fn from(e: FidoError) -> Self {
AuthenticatorError { cause: e}
}
}
impl From<cryptsetup_rs::device::Error> for Fido2LuksError {
fn from(e : cryptsetup_rs::device::Error) -> Self {
LuksError { cause: e }
}
}
impl From<io::Error> for Fido2LuksError {
fn from(e : io::Error) -> Self {
IoError { cause: e }
}
}
impl From<serde_json::error::Error> for Fido2LuksError {
fn from(e : serde_json::error::Error) -> Self {
ConfigurationError { cause: e }
}
}

187
src/main.rs Normal file
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#[macro_use] extern crate failure;
#[macro_use] extern crate serde_derive;
use crate::error::*;
use crypto::digest::Digest;
use crypto::sha2::Sha256;
use std::fs::File;
use std::io::{Read, Write};
use std::path::{PathBuf, Path};
use ctap::extensions::hmac::{HmacExtension, FidoHmacCredential};
use ctap;
use ctap::FidoDevice;
use cryptsetup_rs as luks;
use cryptsetup_rs::Luks1CryptDevice;
use serde_derive::{Serialize, Deserialize};
use std::process::Command;
mod error;
#[derive(Debug, Deserialize, Serialize)]
pub struct Config {
pub credential_id: String,
pub input_salt: InputSalt,
pub device: PathBuf,
pub mapper_name: String,
pub password_helper: PathBuf,
}
impl Default for Config {
fn default() -> Self {
Config {
credential_id: "generate using solo key make-credential".into(),
input_salt: Default::default(),
device: "/dev/some-vg/my-volume".into(),
mapper_name: "2fa-secured-luks".into(),
password_helper: "/lib/cryptsetup/askpass".into()
}
}
}
#[derive(Debug, Deserialize, Serialize)]
pub enum InputSalt {
AskPassword,
File { path: PathBuf },
Both { path: PathBuf },
}
impl Default for InputSalt {
fn default() -> Self {
InputSalt::AskPassword
}
}
impl InputSalt {
fn obtain(&self, password_helper: &PathBuf) -> Fido2LuksResult<[u8; 32]> {
let mut digest = Sha256::new();
match self {
InputSalt::File { path } => {
let mut do_io = || {
let mut reader = File::open(path)?;
let mut buf = [0u8; 512];
loop {
let red = reader.read(&mut buf)?;
digest.input(&buf[0..red]);
if red == 0 {
break;
}
}
Ok(())
};
do_io().map_err(|cause| Fido2LuksError::KeyfileError { cause })?;
}
InputSalt::AskPassword => {
let password =Command::new(password_helper).arg("FIDO2 Password salt:").output().map_err(|e| Fido2LuksError::AskPassError{ cause: e })?.stdout;
digest.input(&password);
}
InputSalt::Both { path} => {
digest.input(&InputSalt::AskPassword.obtain(password_helper)?);
digest.input(&InputSalt::File { path: path.clone() }.obtain(password_helper)?)
}
}
let mut salt = [0u8; 32];
digest.result(&mut salt);
Ok(salt)
}
}
fn open_container(device: &PathBuf, name: &str, secret: &[u8; 32]) -> Fido2LuksResult<()> {
let mut handle = luks::open(device)?.luks1()?;
let _slot = handle.activate(name, &secret[..])?;
Ok(())
}
fn perform_challenge(credential_id: &str, salt: &[u8; 32]) -> Fido2LuksResult<[u8; 32]> {
let cred = FidoHmacCredential{
id: hex::decode(credential_id).unwrap(),
rp_id: "hmac".to_string()
};
let mut errs = Vec::new();
for di in ctap::get_devices()? {
let mut dev = FidoDevice::new(&di)?;
match dev.hmac_challange(&cred, &salt[..]) {
Ok(secret) => {
return Ok(secret);
}
Err(e) => {
errs.push(e);
}
}
}
Err(errs.pop().ok_or(Fido2LuksError::NoAuthenticatorError)?)?
}
fn load_config(reader: &mut dyn Read) -> Fido2LuksResult<Config> {
let mut conf_str = String::new();
reader.read_to_string(&mut conf_str)?;
Ok(serde_json::from_str((&conf_str))?)
}
fn setup() {
let mut config = Config::default();
let save_config = |c: &Config| {
File::create("fido2luks.json").expect("Failed to save config").write_all(serde_json::to_string_pretty(c).unwrap().as_bytes()).expect("Failed to save config");
};
fn ask_str(q: &str) -> String {
let stdin = std::io::stdin();
let mut s = String::new();
print!("{}", q);
std::io::stdout().flush().ok().expect("Could not flush stdout");
stdin.read_line(&mut s).expect("Failed to read rom stdin");
s.trim().to_owned()
}
fn ask_bool(q: &str) -> bool {
ask_str(&format!("{} (y/n)", q)) == "y"
}
println!("1. Generating a credential");
let mut ccred: Option<FidoHmacCredential> = None;
for di in ctap::get_devices().expect("Failed to query USB for 2fa devices") {
let mut dev = FidoDevice::new(&di).expect("Failed to open 2fa device");
match dev.make_hmac_credential() {
Ok(cred) => {
ccred = Some(cred);
break;
}
Err(e) => println!("Failed to to obtain credential trying next device(if applicable)"),
}
}
config.credential_id = hex::encode(ccred.expect("No credential could be obtained").id);
save_config(&config);
loop {
let device = ask_str("Path to your luks device: ");
if Path::new(&device).exists() || ask_bool(&format!("{} does not exist, save anyway?", device)) {
config.device = device.into();
break;
}
}
save_config(&config);
config.mapper_name = ask_str("Name for decrypted disk: ");
save_config(&config);
println!("Config saved to: fido2luks.json");
}
fn main() -> Fido2LuksResult<()> {
let conf = load_config(&mut File::open("/etc/fido2luks.json").or(File::open("fido2luks.json"))?)?;
let salt = conf.input_salt.obtain(&conf.password_helper)?;
dbg!(hex::encode(&salt));
let secret = {
let mut digest = Sha256::new();
digest.input(&salt);
digest.input(&perform_challenge(&conf.credential_id, &salt)?);
let mut secret = [0u8; 32];
digest.result(&mut secret);
secret
};
dbg!(hex::encode(&secret));
open_container(&conf.device, &conf.mapper_name,&secret)?;
Ok(())
}