src/bin/proxmox-backup-client.rs - key API: pass kdf parameter

Allow to store keys without password.

src/backup/key_derivation.rs

@@ -57,13 +57,44 @@ impl KeyDerivationConfig {
 
 #[derive(Deserialize, Serialize, Debug)]
 pub struct KeyConfig {
-    kdf: Option<KeyDerivationConfig>,
+    pub kdf: Option<KeyDerivationConfig>,
     #[serde(with = "proxmox::tools::serde::date_time_as_rfc3339")]
-    created: DateTime<Local>,
+    pub created: DateTime<Local>,
     #[serde(with = "proxmox::tools::serde::bytes_as_base64")]
-    data: Vec<u8>,
+    pub data: Vec<u8>,
  }
 
+pub fn store_key_config(
+    path: &std::path::Path,
+    replace: bool,
+    key_config: KeyConfig,
+) -> Result<(), Error> {
+
+    let data = serde_json::to_string(&key_config)?;
+
+    use std::io::Write;
+
+    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(())
+}
 
 pub fn store_key_with_passphrase(
     path: &std::path::Path,
@@ -104,37 +135,11 @@ pub fn store_key_with_passphrase(
 
     let created =  Local.timestamp(Local::now().timestamp(), 0);
 
-
-    let key_config = KeyConfig {
+    store_key_config(path, replace, KeyConfig {
         kdf: Some(kdf),
         created,
         data: enc_data,
-    };
-
-    let data = serde_json::to_string(&key_config)?;
-
-    use std::io::Write;
-
-    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(())
+    })
 }
 
 pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<Vec<u8>, Error>) -> Result<Vec<u8>, Error> {

src/bin/proxmox-backup-client.rs

@@ -812,18 +812,34 @@ fn key_create(
     let path = tools::required_string_param(&param, "path")?;
     let path = PathBuf::from(path);
 
-    // always read from tty
+    let kdf = param["kdf"].as_str().unwrap_or("scrypt");
+
+    let key = proxmox::sys::linux::random_data(32)?;
+
+    if kdf == "scrypt" {
+        // always read passphrase from tty
         if !crate::tools::tty::stdin_isatty() {
             bail!("unable to read passphrase - no tty");
         }
 
         let password = crate::tools::tty::read_password("Encryption Key Password: ")?;
 
-    let key = proxmox::sys::linux::random_data(32)?;
-
         store_key_with_passphrase(&path, &key, &password, false)?;
 
         Ok(Value::Null)
+    } else if kdf == "none" {
+        let created =  Local.timestamp(Local::now().timestamp(), 0);
+
+        store_key_config(&path, false, KeyConfig {
+            kdf: None,
+            created,
+            data: key,
+        })?;
+
+        Ok(Value::Null)
+    } else {
+        unreachable!();
+    }
 }
 
 
@@ -836,6 +852,8 @@ fn key_change_passphrase(
     let path = tools::required_string_param(&param, "path")?;
     let path = PathBuf::from(path);
 
+    let kdf = param["kdf"].as_str().unwrap_or("scrypt");
+
     // we need a TTY to query the new password
     if !crate::tools::tty::stdin_isatty() {
         bail!("unable to change passphrase - no tty");
@@ -843,6 +861,8 @@ fn key_change_passphrase(
 
     let key = load_and_decrtypt_key(&path, get_encryption_key_password)?;
 
+    if kdf == "scrypt" {
+
         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: ")?)?;
 
@@ -857,16 +877,38 @@ fn key_change_passphrase(
         store_key_with_passphrase(&path, &key, new_pw.as_bytes(), true)?;
 
         Ok(Value::Null)
+    } else if kdf == "none" {
+        // fixme: keep original creation time, add modified timestamp ??
+        let created =  Local.timestamp(Local::now().timestamp(), 0);
+
+        store_key_config(&path, true, KeyConfig {
+            kdf: None,
+            created,
+            data: key,
+        })?;
+
+        Ok(Value::Null)
+    } else {
+        unreachable!();
+    }
 }
 
 fn key_mgmt_cli() -> CliCommandMap {
 
+    let kdf_schema: Arc<Schema> = Arc::new(
+        StringSchema::new("Key derivation function. Choose 'none' to store the key unecrypted.")
+            .format(Arc::new(ApiStringFormat::Enum(&["scrypt", "none"])))
+            .default("scrypt")
+            .into()
+    );
+
     // fixme: change-passphrase, import, export, list
     let key_create_cmd_def = CliCommand::new(
         ApiMethod::new(
             key_create,
             ObjectSchema::new("Create a new encryption key.")
                 .required("path", StringSchema::new("File system path."))
+                .optional("kdf", kdf_schema.clone())
         ))
         .arg_param(vec!["path"])
         .completion_cb("path", tools::complete_file_name);
@@ -876,6 +918,7 @@ fn key_mgmt_cli() -> CliCommandMap {
             key_change_passphrase,
             ObjectSchema::new("Change the passphrase required to decrypt the key.")
                 .required("path", StringSchema::new("File system path."))
+                .optional("kdf", kdf_schema.clone())
          ))
         .arg_param(vec!["path"])
         .completion_cb("path", tools::complete_file_name);