file-restore: support encrypted VM backups

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

src/bin/proxmox-file-restore.rs

@@ -30,7 +30,7 @@ pub mod proxmox_client_tools;
 use proxmox_client_tools::{
     complete_group_or_snapshot, complete_repository, connect, extract_repository_from_value,
     key_source::{
-        crypto_parameters, format_key_source, get_encryption_key_password, KEYFD_SCHEMA,
+        crypto_parameters_keep_fd, format_key_source, get_encryption_key_password, KEYFD_SCHEMA,
         KEYFILE_SCHEMA,
     },
     REPO_URL_SCHEMA,
@@ -76,6 +76,18 @@ fn parse_path(path: String, base64: bool) -> Result<ExtractPath, Error> {
     }
 }
 
+fn keyfile_path(param: &Value) -> Option<String> {
+    if let Some(Value::String(keyfile)) = param.get("keyfile") {
+        return Some(keyfile.to_owned());
+    }
+
+    if let Some(Value::Number(keyfd)) = param.get("keyfd") {
+        return Some(format!("/dev/fd/{}", keyfd));
+    }
+
+    None
+}
+
 #[api(
    input: {
        properties: {
@@ -138,7 +150,8 @@ async fn list(
     let snapshot: BackupDir = snapshot.parse()?;
     let path = parse_path(path, base64)?;
 
-    let crypto = crypto_parameters(&param)?;
+    let keyfile = keyfile_path(&param);
+    let crypto = crypto_parameters_keep_fd(&param)?;
     let crypt_config = match crypto.enc_key {
         None => None,
         Some(ref key) => {
@@ -210,6 +223,7 @@ async fn list(
                 manifest,
                 repo,
                 snapshot,
+                keyfile,
             };
             let driver: Option<BlockDriverType> = match param.get("driver") {
                 Some(drv) => Some(serde_json::from_value(drv.clone())?),
@@ -309,7 +323,8 @@ async fn extract(
         None => Some(std::env::current_dir()?),
     };
 
-    let crypto = crypto_parameters(&param)?;
+    let keyfile = keyfile_path(&param);
+    let crypto = crypto_parameters_keep_fd(&param)?;
     let crypt_config = match crypto.enc_key {
         None => None,
         Some(ref key) => {
@@ -360,6 +375,7 @@ async fn extract(
                 manifest,
                 repo,
                 snapshot,
+                keyfile,
             };
             let driver: Option<BlockDriverType> = match param.get("driver") {
                 Some(drv) => Some(serde_json::from_value(drv.clone())?),

src/bin/proxmox_file_restore/block_driver.rs

@@ -21,6 +21,7 @@ pub struct SnapRestoreDetails {
     pub repo: BackupRepository,
     pub snapshot: BackupDir,
     pub manifest: BackupManifest,
+    pub keyfile: Option<String>,
 }
 
 /// Return value of a BlockRestoreDriver.status() call, 'id' must be valid for .stop(id)

src/bin/proxmox_file_restore/qemu_helper.rs

@@ -190,9 +190,14 @@ pub async fn start_vm(
             continue;
         }
         drives.push("-drive".to_owned());
+        let keyfile = if let Some(ref keyfile) = details.keyfile {
+            format!(",,keyfile={}", keyfile)
+        } else {
+            "".to_owned()
+        };
         drives.push(format!(
-            "file=pbs:repository={},,snapshot={},,archive={},read-only=on,if=none,id=drive{}",
-            details.repo, details.snapshot, file, id
+            "file=pbs:repository={},,snapshot={},,archive={}{},read-only=on,if=none,id=drive{}",
+            details.repo, details.snapshot, file, keyfile, id
         ));
         drives.push("-device".to_owned());
         // drive serial is used by VM to map .fidx files to /dev paths