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src/bin/proxmox-backup-client.rs: implement "key change-passphrase"

This commit is contained in:
Dietmar Maurer 2019-06-17 13:10:00 +02:00
parent f2401311b0
commit ac71623483
1 changed files with 162 additions and 26 deletions
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178
src/bin/proxmox-backup-client.rs
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@ -803,31 +803,13 @@ fn get_encryption_key_password() -> Result<String, Error> {
bail!("no password input mechanism available");
}
fn key_create(
param: Value,
_info: &ApiMethod,
_rpcenv: &mut dyn RpcEnvironment,
) -> Result<Value, Error> {
let repo_url = tools::required_string_param(&param, "repository")?;
let repo: BackupRepository = repo_url.parse()?;
let base = BaseDirectories::with_prefix("proxmox-backup")?;
let repo = repo.to_string();
// usually $HOME/.config/proxmox-backup/xxx.enc_key
let path = base.place_config_file(&format!("{}.enc_key", repo))?;
let password = get_encryption_key_password()?;
let raw_key = proxmox::sys::linux::random_data(32)?;
fn key_store_with_password(path: &std::path::Path, raw_key: &[u8], password: &[u8], replace: bool) -> Result<(), Error> {
let salt = proxmox::sys::linux::random_data(32)?;
let scrypt_config = SCryptConfig { n: 65536, r: 8, p: 1, salt };
let derived_key = CryptConfig::derive_key_from_password(password.as_bytes(), &scrypt_config)?;
let derived_key = CryptConfig::derive_key_from_password(password, &scrypt_config)?;
let cipher = openssl::symm::Cipher::aes_256_gcm();
@ -862,16 +844,160 @@ fn key_create(
let data = result.to_string();
try_block!({
if replace {
let mode = nix::sys::stat::Mode::S_IRUSR | nix::sys::stat::Mode::S_IWUSR;
crate::tools::file_set_contents(&path, data.as_bytes(), Some(mode))?;
} else {
use std::os::unix::fs::OpenOptionsExt;
let mut file = std::fs::OpenOptions::new()
.write(true)
.mode(0o0600)
.create_new(true)
.open(&path)?;
file.write_all(data.as_bytes())?;
}
Ok(())
}).map_err(|err: Error| format_err!("Unable to create file {:?} - {}", path, err))?;
Ok(())
}
fn key_create(
param: Value,
_info: &ApiMethod,
_rpcenv: &mut dyn RpcEnvironment,
) -> Result<Value, Error> {
let repo_url = tools::required_string_param(&param, "repository")?;
let repo: BackupRepository = repo_url.parse()?;
let base = BaseDirectories::with_prefix("proxmox-backup")?;
let repo = repo.to_string();
// usually $HOME/.config/proxmox-backup/xxx.enc_key
let path = base.place_config_file(&format!("{}.enc_key", repo))?;
let password = get_encryption_key_password()?;
let key = proxmox::sys::linux::random_data(32)?;
key_store_with_password(&path, &key, password.as_bytes(), false)?;
Ok(Value::Null)
}
fn key_load_and_decrtypt(path: &std::path::Path) -> Result<Vec<u8>, Error> {
let data = crate::tools::file_get_json(&path, None)?;
println!("DATA: {:?}", data);
match data["kdf"].as_str() {
Some(kdf) => {
if kdf != "scrypt" {
bail!("Unknown key derivation function '{}'", kdf);
}
},
None => bail!("missing property 'kdf'."),
}
let salt = match data["salt"].as_str() {
Some(hex) => proxmox::tools::hex_to_bin(hex)?,
None => bail!("missing property 'salt'."),
};
let n = match data["n"].as_u64() {
Some(n) => n,
None => bail!("missing property 'n'."),
};
let r = match data["r"].as_u64() {
Some(r) => r,
None => bail!("missing property 'r'."),
};
let p = match data["p"].as_u64() {
Some(p) => p,
None => bail!("missing property 'p'."),
};
let scrypt_config = SCryptConfig { n, r, p, salt };
let password = get_encryption_key_password()?;
if password.len() < 5 {
bail!("Password is too short!");
}
let derived_key = CryptConfig::derive_key_from_password(password.as_bytes(), &scrypt_config)?;
let iv = match data["iv"].as_str() {
Some(hex) => proxmox::tools::hex_to_bin(hex)?,
None => bail!("missing property 'iv'."),
};
let tag = match data["tag"].as_str() {
Some(hex) => proxmox::tools::hex_to_bin(hex)?,
None => bail!("missing property 'tag'."),
};
let data = match data["data"].as_str() {
Some(hex) => proxmox::tools::hex_to_bin(hex)?,
None => bail!("missing property 'data'."),
};
let cipher = openssl::symm::Cipher::aes_256_gcm();
let decr_data = openssl::symm::decrypt_aead(
cipher,
&derived_key,
Some(&iv),
b"", //??
&data,
&tag,
).map_err(|err| format_err!("Unable to decrypt key - {}", err))?;
Ok(decr_data)
}
fn key_change_passphrase(
param: Value,
_info: &ApiMethod,
_rpcenv: &mut dyn RpcEnvironment,
) -> Result<Value, Error> {
let repo_url = tools::required_string_param(&param, "repository")?;
let repo: BackupRepository = repo_url.parse()?;
let base = BaseDirectories::with_prefix("proxmox-backup")?;
let repo = repo.to_string();
// usually $HOME/.config/proxmox-backup/xxx.enc_key
let path = base.place_config_file(&format!("{}.enc_key", repo))?;
// we need a TTY to query the new password
if !crate::tools::tty::stdin_isatty() {
bail!("unable to change passphrase - no tty");
}
let key = key_load_and_decrtypt(&path)?;
let new_pw = String::from_utf8(crate::tools::tty::read_password("New Password: ")?)?;
let verify_pw = String::from_utf8(crate::tools::tty::read_password("Verify Password: ")?)?;
if new_pw != verify_pw {
bail!("Password verification fail!");
}
if new_pw.len() < 5 {
bail!("Password is too short!");
}
key_store_with_password(&path, &key, new_pw.as_bytes(), true)?;
Ok(Value::Null)
}
@ -887,8 +1013,18 @@ fn key_mgmt_cli() -> CliCommandMap {
.arg_param(vec!["repository"])
.completion_cb("repository", complete_repository);
let key_change_passphrase_cmd_def = CliCommand::new(
ApiMethod::new(
key_change_passphrase,
ObjectSchema::new("Change the passphrase required to decrypt the key.")
.required("repository", REPO_URL_SCHEMA.clone())
))
.arg_param(vec!["repository"])
.completion_cb("repository", complete_repository);
let cmd_def = CliCommandMap::new()
.insert("create".to_owned(), key_create_cmd_def.into());
.insert("create".to_owned(), key_create_cmd_def.into())
.insert("change-passphrase".to_owned(), key_change_passphrase_cmd_def.into());
cmd_def
}