2 use bch_bindgen::bcachefs::bch_sb_handle;
7 #[derive(Clone, Debug)]
14 #[derive(Clone, Debug)]
15 pub struct KeyLoc(pub Option<KeyLocation>);
16 impl std::ops::Deref for KeyLoc {
17 type Target = Option<KeyLocation>;
18 fn deref(&self) -> &Self::Target {
23 impl std::str::FromStr for KeyLoc {
24 type Err = anyhow::Error;
25 fn from_str(s: &str) -> anyhow::Result<Self> {
27 "" => Ok(KeyLoc(None)),
28 "fail" => Ok(KeyLoc(Some(KeyLocation::Fail))),
29 "wait" => Ok(KeyLoc(Some(KeyLocation::Wait))),
30 "ask" => Ok(KeyLoc(Some(KeyLocation::Ask))),
31 _ => Err(anyhow!("invalid password option")),
36 fn check_for_key(key_name: &std::ffi::CStr) -> anyhow::Result<bool> {
37 use bch_bindgen::keyutils::{self, keyctl_search};
38 let key_name = key_name.to_bytes_with_nul().as_ptr() as *const _;
39 let key_type = c_str!("logon");
41 let key_id = unsafe { keyctl_search(keyutils::KEY_SPEC_USER_KEYRING, key_type, key_name, 0) };
43 info!("Key has became available");
45 } else if errno::errno().0 != libc::ENOKEY {
46 Err(crate::ErrnoError(errno::errno()).into())
52 fn wait_for_key(uuid: &uuid::Uuid) -> anyhow::Result<()> {
53 let key_name = std::ffi::CString::new(format!("bcachefs:{}", uuid)).unwrap();
55 if check_for_key(&key_name)? {
59 std::thread::sleep(std::time::Duration::from_secs(1));
63 const BCH_KEY_MAGIC: &str = "bch**key";
64 fn ask_for_key(sb: &bch_sb_handle) -> anyhow::Result<()> {
65 use bch_bindgen::bcachefs::{self, bch2_chacha_encrypt_key, bch_encrypted_key, bch_key};
66 use byteorder::{LittleEndian, ReadBytesExt};
67 use std::os::raw::c_char;
69 let key_name = std::ffi::CString::new(format!("bcachefs:{}", sb.sb().uuid())).unwrap();
70 if check_for_key(&key_name)? {
74 let bch_key_magic = BCH_KEY_MAGIC.as_bytes().read_u64::<LittleEndian>().unwrap();
75 let crypt = sb.sb().crypt().unwrap();
76 let pass = rpassword::read_password_from_tty(Some("Enter passphrase: "))?;
77 let pass = std::ffi::CString::new(pass.trim_end())?; // bind to keep the CString alive
78 let mut output: bch_key = unsafe {
79 bcachefs::derive_passphrase(
80 crypt as *const _ as *mut _,
81 pass.as_c_str().to_bytes_with_nul().as_ptr() as *const _,
85 let mut key = crypt.key().clone();
87 bch2_chacha_encrypt_key(
88 &mut output as *mut _,
90 &mut key as *mut _ as *mut _,
91 std::mem::size_of::<bch_encrypted_key>() as usize,
95 Err(anyhow!("chacha decryption failure"))
96 } else if key.magic != bch_key_magic {
97 Err(anyhow!("failed to verify the password"))
99 let key_type = c_str!("logon");
101 bch_bindgen::keyutils::add_key(
103 key_name.as_c_str().to_bytes_with_nul() as *const _ as *const c_char,
104 &output as *const _ as *const _,
105 std::mem::size_of::<bch_key>() as usize,
106 bch_bindgen::keyutils::KEY_SPEC_USER_KEYRING,
110 Err(anyhow!("failed to add key to keyring: {}", errno::errno()))
117 pub fn prepare_key(sb: &bch_sb_handle, password: KeyLocation) -> anyhow::Result<()> {
118 info!("checking if key exists for filesystem {}", sb.sb().uuid());
120 KeyLocation::Fail => Err(anyhow!("no key available")),
121 KeyLocation::Wait => Ok(wait_for_key(&sb.sb().uuid())?),
122 KeyLocation::Ask => ask_for_key(sb),