src/bin/proxmox-backup-client.rs: add keyfile parameter for backup

src/backup/key_derivation.rs

@@ -142,7 +142,7 @@ pub fn store_key_with_passphrase(
     })
 }
 
-pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<Vec<u8>, Error>) -> Result<Vec<u8>, Error> {
+pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<Vec<u8>, Error>) -> Result<[u8;32], Error> {
 
     let raw = crate::tools::file_get_contents(&path)?;
     let data = String::from_utf8(raw)?;
@@ -151,7 +151,7 @@ pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<
 
     let raw_data = key_config.data;
 
-    if let Some(kdf) = key_config.kdf {
+    let key = if let Some(kdf) = key_config.kdf {
 
         let passphrase = passphrase()?;
         if passphrase.len() < 5 {
@@ -178,8 +178,13 @@ pub fn load_and_decrtypt_key(path: &std::path::Path, passphrase: fn() -> Result<
             &tag,
         ).map_err(|err| format_err!("Unable to decrypt key - {}", err))?;
 
-        Ok(decr_data)
+        decr_data
     } else {
-        Ok(raw_data)
+        raw_data
-    }
+    };
+
+    let mut result = [0u8; 32];
+    result.copy_from_slice(&key);
+
+    Ok(result)
 }

src/bin/proxmox-backup-client.rs

@@ -407,6 +407,8 @@ fn create_backup(
         verify_chunk_size(size)?;
     }
 
+    let keyfile = param["keyfile"].as_str().map(|p| PathBuf::from(p));
+
     let backup_id = param["host-id"].as_str().unwrap_or(&tools::nodename());
 
     let mut upload_list = vec![];
@@ -466,7 +468,13 @@ fn create_backup(
     println!("Client name: {}", tools::nodename());
     println!("Start Time: {}", backup_time.to_rfc3339());
 
-    let crypt_config = None;
+    let crypt_config = match keyfile {
+        None => None,
+        Some(path) => {
+            let key = load_and_decrtypt_key(&path, get_encryption_key_password)?;
+            Some(Arc::new(CryptConfig::new(key)?))
+        }
+    };
 
     let client = client.start_backup(repo.store(), "host", &backup_id, verbose).wait()?;
 
@@ -884,7 +892,7 @@ fn key_change_passphrase(
         store_key_config(&path, true, KeyConfig {
             kdf: None,
             created,
-            data: key,
+            data: key.to_vec(),
         })?;
 
         Ok(Value::Null)
@@ -951,6 +959,9 @@ fn main() {
                         backup_source_schema,
                     ).min_length(1)
                 )
+                .optional(
+                    "keyfile",
+                    StringSchema::new("Path to encryption key. All data will be encrypted using this key."))
                 .optional(
                     "verbose",
                     BooleanSchema::new("Verbose output.").default(false))
@@ -968,6 +979,7 @@ fn main() {
         .arg_param(vec!["repository", "backupspec"])
         .completion_cb("repository", complete_repository)
         .completion_cb("backupspec", complete_backup_source)
+        .completion_cb("keyfile", tools::complete_file_name)
         .completion_cb("chunk-size", complete_chunk_size);
 
     let list_cmd_def = CliCommand::new(