364 lines
16 KiB
Rust
364 lines
16 KiB
Rust
use anyhow::{bail, format_err, Context, Error};
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use serde::{Deserialize, Serialize};
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use crate::backup::{CryptConfig, Fingerprint};
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use proxmox::api::api;
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use proxmox::tools::fs::{file_get_contents, replace_file, CreateOptions};
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use proxmox::try_block;
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#[api(default: "scrypt")]
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#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
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#[serde(rename_all = "lowercase")]
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/// Key derivation function for password protected encryption keys.
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pub enum Kdf {
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/// Do not encrypt the key.
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None,
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/// Encrypt they key with a password using SCrypt.
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Scrypt,
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/// Encrtypt the Key with a password using PBKDF2
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PBKDF2,
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}
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impl Default for Kdf {
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#[inline]
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fn default() -> Self {
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Kdf::Scrypt
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}
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}
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#[derive(Deserialize, Serialize, Clone, Debug)]
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pub enum KeyDerivationConfig {
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Scrypt {
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n: u64,
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r: u64,
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p: u64,
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#[serde(with = "proxmox::tools::serde::bytes_as_base64")]
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salt: Vec<u8>,
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},
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PBKDF2 {
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iter: usize,
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#[serde(with = "proxmox::tools::serde::bytes_as_base64")]
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salt: Vec<u8>,
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},
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}
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impl KeyDerivationConfig {
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/// Derive a key from provided passphrase
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pub fn derive_key(&self, passphrase: &[u8]) -> Result<[u8; 32], Error> {
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let mut key = [0u8; 32];
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match self {
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KeyDerivationConfig::Scrypt { n, r, p, salt } => {
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// estimated scrypt memory usage is 128*r*n*p
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openssl::pkcs5::scrypt(
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passphrase,
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&salt,
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*n, *r, *p,
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1025*1024*1024,
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&mut key,
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)?;
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Ok(key)
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}
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KeyDerivationConfig::PBKDF2 { iter, salt } => {
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openssl::pkcs5::pbkdf2_hmac(
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passphrase,
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&salt,
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*iter,
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openssl::hash::MessageDigest::sha256(),
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&mut key,
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)?;
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Ok(key)
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}
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}
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}
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}
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#[derive(Deserialize, Serialize, Clone, Debug)]
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pub struct KeyConfig {
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pub kdf: Option<KeyDerivationConfig>,
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#[serde(with = "proxmox::tools::serde::epoch_as_rfc3339")]
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pub created: i64,
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#[serde(with = "proxmox::tools::serde::epoch_as_rfc3339")]
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pub modified: i64,
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#[serde(with = "proxmox::tools::serde::bytes_as_base64")]
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pub data: Vec<u8>,
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#[serde(skip_serializing_if = "Option::is_none")]
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#[serde(default)]
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pub fingerprint: Option<Fingerprint>,
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}
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pub fn store_key_config(
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path: &std::path::Path,
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replace: bool,
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key_config: KeyConfig,
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) -> Result<(), Error> {
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let data = serde_json::to_string(&key_config)?;
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use std::io::Write;
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try_block!({
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if replace {
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let mode = nix::sys::stat::Mode::S_IRUSR | nix::sys::stat::Mode::S_IWUSR;
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replace_file(&path, data.as_bytes(), CreateOptions::new().perm(mode))?;
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} else {
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use std::os::unix::fs::OpenOptionsExt;
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let mut file = std::fs::OpenOptions::new()
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.write(true)
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.mode(0o0600)
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.create_new(true)
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.open(&path)?;
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file.write_all(data.as_bytes())?;
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}
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Ok(())
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}).map_err(|err: Error| format_err!("Unable to create file {:?} - {}", path, err))?;
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Ok(())
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}
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pub fn encrypt_key_with_passphrase(
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raw_key: &[u8],
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passphrase: &[u8],
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kdf: Kdf,
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) -> Result<KeyConfig, Error> {
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let salt = proxmox::sys::linux::random_data(32)?;
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let kdf = match kdf {
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Kdf::Scrypt => KeyDerivationConfig::Scrypt {
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n: 65536,
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r: 8,
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p: 1,
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salt,
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},
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Kdf::PBKDF2 => KeyDerivationConfig::PBKDF2 {
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iter: 65535,
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salt,
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},
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Kdf::None => {
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bail!("No key derivation function specified");
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}
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};
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let derived_key = kdf.derive_key(passphrase)?;
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let cipher = openssl::symm::Cipher::aes_256_gcm();
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let iv = proxmox::sys::linux::random_data(16)?;
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let mut tag = [0u8; 16];
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let encrypted_key = openssl::symm::encrypt_aead(
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cipher,
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&derived_key,
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Some(&iv),
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b"",
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&raw_key,
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&mut tag,
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)?;
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let mut enc_data = vec![];
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enc_data.extend_from_slice(&iv);
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enc_data.extend_from_slice(&tag);
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enc_data.extend_from_slice(&encrypted_key);
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let created = proxmox::tools::time::epoch_i64();
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Ok(KeyConfig {
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kdf: Some(kdf),
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created,
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modified: created,
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data: enc_data,
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fingerprint: None,
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})
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}
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pub fn load_and_decrypt_key(
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path: &std::path::Path,
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passphrase: &dyn Fn() -> Result<Vec<u8>, Error>,
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) -> Result<([u8;32], i64, Fingerprint), Error> {
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decrypt_key(&file_get_contents(&path)?, passphrase)
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.with_context(|| format!("failed to load decryption key from {:?}", path))
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}
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pub fn decrypt_key_config(
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key_config: &KeyConfig,
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passphrase: &dyn Fn() -> Result<Vec<u8>, Error>,
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) -> Result<([u8;32], i64, Fingerprint), Error> {
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let raw_data = &key_config.data;
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let key = if let Some(ref kdf) = key_config.kdf {
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let passphrase = passphrase()?;
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if passphrase.len() < 5 {
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bail!("Passphrase is too short!");
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}
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let derived_key = kdf.derive_key(&passphrase)?;
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if raw_data.len() < 32 {
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bail!("Unable to encode key - short data");
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}
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let iv = &raw_data[0..16];
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let tag = &raw_data[16..32];
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let enc_data = &raw_data[32..];
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let cipher = openssl::symm::Cipher::aes_256_gcm();
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openssl::symm::decrypt_aead(
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cipher,
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&derived_key,
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Some(&iv),
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b"", //??
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&enc_data,
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&tag,
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).map_err(|err| format_err!("Unable to decrypt key (wrong password?) - {}", err))?
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} else {
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raw_data.clone()
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};
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let mut result = [0u8; 32];
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result.copy_from_slice(&key);
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let crypt_config = CryptConfig::new(result)?;
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let fingerprint = crypt_config.fingerprint();
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if let Some(ref stored_fingerprint) = key_config.fingerprint {
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if &fingerprint != stored_fingerprint {
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bail!(
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"KeyConfig contains wrong fingerprint {}, contained key has fingerprint {}",
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stored_fingerprint, fingerprint
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);
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}
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}
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Ok((result, key_config.created, fingerprint))
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}
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pub fn decrypt_key(
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mut keydata: &[u8],
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passphrase: &dyn Fn() -> Result<Vec<u8>, Error>,
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) -> Result<([u8;32], i64, Fingerprint), Error> {
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let key_config: KeyConfig = serde_json::from_reader(&mut keydata)?;
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decrypt_key_config(&key_config, passphrase)
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}
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pub fn rsa_encrypt_key_config(
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rsa: openssl::rsa::Rsa<openssl::pkey::Public>,
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key: &KeyConfig,
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) -> Result<Vec<u8>, Error> {
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let data = serde_json::to_string(key)?.as_bytes().to_vec();
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let mut buffer = vec![0u8; rsa.size() as usize];
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let len = rsa.public_encrypt(&data, &mut buffer, openssl::rsa::Padding::PKCS1)?;
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if len != buffer.len() {
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bail!("got unexpected length from rsa.public_encrypt().");
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}
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Ok(buffer)
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}
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pub fn rsa_decrypt_key_config(
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rsa: openssl::rsa::Rsa<openssl::pkey::Private>,
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key: &[u8],
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passphrase: &dyn Fn() -> Result<Vec<u8>, Error>,
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) -> Result<([u8; 32], i64, Fingerprint), Error> {
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let mut buffer = vec![0u8; rsa.size() as usize];
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let decrypted = rsa
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.private_decrypt(key, &mut buffer, openssl::rsa::Padding::PKCS1)
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.map_err(|err| format_err!("failed to decrypt KeyConfig using RSA - {}", err))?;
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decrypt_key(&mut buffer[..decrypted], passphrase)
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}
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#[test]
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fn encrypt_decrypt_test() -> Result<(), Error> {
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use openssl::bn::BigNum;
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// hard-coded RSA key to avoid RNG load
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let n = BigNum::from_dec_str("763297775503047285270249195475255390818773358873206395804367739392073195066702037300664538507287660511788773520960052020490020500131532096848837840341808263208238432840771609456175669299183585737297710099814398628316822920397690811697390531460556770185920171717205255045261184699028939408338685227311360280561223048029934992213591164033485740834987719043448066906674761591422028943934961140687347873900379335604823288576732038392698785999130614670054444889172406669687648738432457362496418067100853836965448514921778954255248154805294695304544857640397043149235605321195443660560591215396460879078079707598866525981810195613239506906019678159905700662365794059211182357495974678620101388841934629146959674859076053348229540838236896752745251734302737503775744293828247434369307467826891918526442390310055226655466835862319406221740752718258752129277114593279326227799698036058425261999904258111333276380007458144919278763944469942242338999234161147188585579934794573969834141472487673642778646170134259790130811461184848743147137198639341697548363179639042991358823669057297753206096865332303845149920379065177826748710006313272747133642274061146677367740923397358666767242901746171920401890395722806446280380164886804469750825832083").expect("converting to bignum failed");
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let e = BigNum::from_dec_str("65537").expect("converting to bignum failed");
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let d = BigNum::from_dec_str("19834537920284564853674022001226176519590018312725185651690468898251379391772488358073023011091610629897253174637151053464371346136136825929376853412608136964518211867003891708559549030570664609466682947037305962494828103719078802086159819263581307957743290849968728341884428605863043529798446388179368090663224786773806846388143274064254180335413340334940446739125488182098535411927937482988091512111514808559058456451259207186517021416246081401087976557460070014777577029793101223558164090029643622447657946212243306210181845486266030884899215596710196751196243890657122549917370139613045651724521564033154854414253451612565268626314358200247667906740226693180923631251719053819020017537699856142036238058103150388959616397059243552685604990510867544536282659146915388522812398795915840913802745825670833498941795568293354230962683054249223513028733221781409833526268687556063636480230666207346771664323325175723577540510559973905170578206847160551684632855673373061549848844186260938182413805301541655002820734307939021848604620517318497220269398148326924299176570233223593669359192722153811016413065311904503101005564780859010942238851216519088762587394817890851764597501374473176420295837906296738426781972820833509964922715585").expect("converting to bignum failed");
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let p = BigNum::from_dec_str("29509637001892646371585718218450720181675215968655693119622290166463846337874978909899277049204111617901784460858811114760264767076166751445502024396748257412446297522757119324882999179307561418697097464139952930737249422485899639568595470472222197161276683797577982497955467948265299386993875583089675892019886767032750524889582030672594405810531152141432362873209548569385820623081973262550874468619670422387868884561012170536839449407663630232422905779693831681822257822783504983493794208329832510955061326579888576047912149807967610736616238778237407615015312695567289456675371922184276823263863231190560557676339").expect("converting to bignum failed");
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let q = BigNum::from_dec_str("25866050993920799422553175902510303878636288340476152724026122959148470649546748310678170203350410878157245623372422271950639190884394436256045773535202161325882791039345330048364703416719823181485853395688815455066122599160191671526435061804017559815713791273329637690511813515454721229797045837580571003198471014420883727461348135261877384657284061678787895040009197824032371314493780688519536250146270701914875469190776765810821706480996720025323321483843112182646061748043938180130013308823672610860230340094502643614566152670758944502783858455501528490806234504795239898001698524105646533910560293336400403204897").expect("converting to bignum failed");
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let dmp1 = BigNum::from_dec_str("21607770579166338313924278588690558922108583912962897316392792781303188398339022047518905458553289108745759383366535358272664077428797321640702979183532285223743426240475893650342331272664468275332046219832278884297711602396407401980831582724583041600551528176116883960387063733484217876666037528133838392148714866050744345765006980605100330287254053877398358630385580919903058731105447806937933747350668236714360621211130384969129674812319182867594036995223272269821421615266717078107026511273509659211002684589097654567453625356436054504001404801715927134738465685565147724902539753143706245247513141254140715042985").expect("converting to bignum failed");
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let dmq1 = BigNum::from_dec_str("294824909477987048059069264677589712640818276551195295555907561384926187881828905626998384758270243160099828809057470393016578048898219996082612765778049262408020582364022789357590879232947921274546172186391582540158896220038500063021605980859684104892476037676079761887366292263067835858498149757735119694054623308549371262243115446856316376077501168409517640338844786525965200908293851935915491689568704919822573134038943559526432621897623477713604851434011395096458613085567264607124524187730342254186063812054159860538030670385536895853938115358646898433438472543479930479076991585011794266310458811393428158049").expect("converting to bignum failed");
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let iqmp = BigNum::from_dec_str("19428066064824171668277167138275898936765006396600005071379051329779053619544399695639107933588871625444213173194462077344726482973273922001955114108600584475883837715007613468112455972196002915686862701860412263935895363086514864873592142686096117947515832613228762197577036084559813332497101195090727973644165586960538914545531208630624795512138060798977135902359295307626262953373309121954863020224150277262533638440848025788447039555055470985052690506486164836957350781708784380677438638580158751807723730202286612196281022183410822668814233870246463721184575820166925259871133457423401827024362448849298618281053").expect("converting to bignum failed");
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let public =
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openssl::rsa::Rsa::from_public_components(n.to_owned().unwrap(), e.to_owned().unwrap())
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.expect("creating hard-coded RSA public key instance failed");
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let private = openssl::rsa::Rsa::from_private_components(n, e, d, p, q, dmp1, dmq1, iqmp)
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.expect("creating hard-coded RSA key instance failed");
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let passphrase = || -> Result<Vec<u8>, Error> { Ok(Vec::new()) };
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let key = KeyConfig {
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kdf: None,
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created: proxmox::tools::time::epoch_i64(),
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modified: proxmox::tools::time::epoch_i64(),
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data: (0u8..32u8).collect(),
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fingerprint: Some(Fingerprint::new([
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14, 171, 212, 70, 11, 110, 185, 202, 52, 80, 35, 222, 226, 183, 120, 199, 144, 229, 74,
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22, 131, 185, 101, 156, 10, 87, 174, 25, 144, 144, 21, 155,
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])),
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};
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let encrypted = rsa_encrypt_key_config(public, &key).expect("encryption failed");
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let (decrypted, created, fingerprint) =
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rsa_decrypt_key_config(private, &encrypted, &passphrase)
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.expect("decryption failed");
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assert_eq!(key.created, created);
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assert_eq!(key.data, decrypted);
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assert_eq!(key.fingerprint, Some(fingerprint));
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Ok(())
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}
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#[test]
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fn fingerprint_checks() -> Result<(), Error> {
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let key = KeyConfig {
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kdf: None,
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created: proxmox::tools::time::epoch_i64(),
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modified: proxmox::tools::time::epoch_i64(),
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data: (0u8..32u8).collect(),
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fingerprint: Some(Fingerprint::new([0u8; 32])), // wrong FP
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};
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let expected_fingerprint = Fingerprint::new([
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14, 171, 212, 70, 11, 110, 185, 202, 52, 80, 35, 222, 226, 183, 120, 199, 144, 229, 74,
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22, 131, 185, 101, 156, 10, 87, 174, 25, 144, 144, 21, 155,
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]);
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let mut data = serde_json::to_vec(&key).expect("encoding KeyConfig failed");
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decrypt_key(&mut data, &{ || { Ok(Vec::new()) }}).expect_err("decoding KeyConfig with wrong fingerprint worked");
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let key = KeyConfig {
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kdf: None,
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created: proxmox::tools::time::epoch_i64(),
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modified: proxmox::tools::time::epoch_i64(),
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data: (0u8..32u8).collect(),
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fingerprint: None,
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};
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let mut data = serde_json::to_vec(&key).expect("encoding KeyConfig failed");
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let (key_data, created, fingerprint) = decrypt_key(&mut data, &{ || { Ok(Vec::new()) }}).expect("decoding KeyConfig without fingerprint failed");
|
|
|
|
assert_eq!(key.data, key_data);
|
|
assert_eq!(key.created, created);
|
|
assert_eq!(expected_fingerprint, fingerprint);
|
|
|
|
Ok(())
|
|
}
|