[pbs-devel] [PATCH v9 proxmox-backup 3/9] chunk store: set file ownership on chunk insert as root user

[Christian Ebner]

Inserting a new chunk into the chunk store as process running with
root priviledger currently does not set an explicit ownership on the
chunk file. As a consequence this will lead to permission issues if
the chunk is operated on by a codepath executed in the less
privileged proxy task running as `backup` user.

Therefore, explicitly set the ownership and permissions of the chunk
file upon insert, if the process is executed as `root` user.

Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
---
changes since version 8:
- not present in previous version

 pbs-datastore/src/chunk_store.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pbs-datastore/src/chunk_store.rs b/pbs-datastore/src/chunk_store.rs
index dc267d752..af42c9e5f 100644
--- a/pbs-datastore/src/chunk_store.rs
+++ b/pbs-datastore/src/chunk_store.rs
@@ -503,10 +503,16 @@ impl ChunkStore {
             .parent()
             .ok_or_else(|| format_err!("unable to get chunk dir"))?;
 
+        let mut create_options = CreateOptions::new();
+        if nix::unistd::Uid::effective().is_root() {
+            let uid = pbs_config::backup_user()?.uid;
+            let gid = pbs_config::backup_group()?.gid;
+            create_options = create_options.owner(uid).group(gid);
+        }
         proxmox_sys::fs::replace_file(
             &chunk_path,
             raw_data,
-            CreateOptions::new(),
+            create_options,
             self.sync_level == DatastoreFSyncLevel::File,
         )
         .map_err(|err| {
-- 
2.39.5