src/backup/data_blob.rs: new load_from_reader(), which verifies the CRC

And make verify_crc private for now. We always call load_from_reader() to
verify the CRC.

Also add load_chunk() to datastore.rs (from chunk_store::read_chunk())

src/api2/admin/datastore.rs

@@ -1037,11 +1037,10 @@ fn upload_backup_log(
             })
             .await?;
 
-        let blob = DataBlob::from_raw(data)?;
-        // always verify CRC at server side
-        blob.verify_crc()?;
-        let raw_data = blob.raw_data();
-        replace_file(&path, raw_data, CreateOptions::new())?;
+        // always verify blob/CRC at server side
+        let blob = DataBlob::load_from_reader(&mut &data[..])?;
+
+        replace_file(&path, blob.raw_data(), CreateOptions::new())?;
 
         // fixme: use correct formatter
         Ok(crate::server::formatter::json_response(Ok(Value::Null)))

src/api2/backup/environment.rs

@@ -416,9 +416,8 @@ impl BackupEnvironment {
         let blob_len = data.len();
         let orig_len = data.len(); // fixme:
 
-        let blob = DataBlob::from_raw(data)?;
-        // always verify CRC at server side
-        blob.verify_crc()?;
+        // always verify blob/CRC at server side
+        let blob = DataBlob::load_from_reader(&mut &data[..])?;
 
         let raw_data = blob.raw_data();
         replace_file(&path, raw_data, CreateOptions::new())?;

src/backup/chunk_store.rs

@@ -184,22 +184,6 @@ impl ChunkStore {
         Ok(true)
     }
 
-    pub fn read_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
-
-        let (chunk_path, digest_str) = self.chunk_path(digest);
-        let mut file = std::fs::File::open(&chunk_path)
-            .map_err(|err| {
-                format_err!(
-                    "store '{}', unable to read chunk '{}' - {}",
-                    self.name,
-                    digest_str,
-                    err,
-                )
-            })?;
-
-        DataBlob::load(&mut file)
-    }
-
     pub fn get_chunk_iterator(
         &self,
     ) -> Result<

src/backup/data_blob.rs

@@ -36,6 +36,11 @@ impl DataBlob {
         &self.raw_data
     }
 
+    /// Returns raw_data size
+    pub fn raw_size(&self) -> u64 {
+        self.raw_data.len() as u64
+    }
+
     /// Consume self and returns raw_data
     pub fn into_inner(self) -> Vec<u8> {
         self.raw_data
@@ -66,8 +71,8 @@ impl DataBlob {
         hasher.finalize()
     }
 
-    /// verify the CRC32 checksum
-    pub fn verify_crc(&self) -> Result<(), Error> {
+    // verify the CRC32 checksum
+    fn verify_crc(&self) -> Result<(), Error> {
         let expected_crc = self.compute_crc();
         if expected_crc != self.crc() {
             bail!("Data blob has wrong CRC checksum.");
@@ -212,13 +217,17 @@ impl DataBlob {
         }
     }
 
-    /// Load blob from ``reader``
-    pub fn load(reader: &mut dyn std::io::Read) -> Result<Self, Error> {
+    /// Load blob from ``reader``, verify CRC
+    pub fn load_from_reader(reader: &mut dyn std::io::Read) -> Result<Self, Error> {
 
         let mut data = Vec::with_capacity(1024*1024);
         reader.read_to_end(&mut data)?;
 
-        Self::from_raw(data)
+        let blob = Self::from_raw(data)?;
+
+        blob.verify_crc()?;
+
+        Ok(blob)
     }
 
     /// Create Instance from raw data
@@ -254,7 +263,7 @@ impl DataBlob {
     /// To do that, we need to decompress data first. Please note that
     /// this is not possible for encrypted chunks. This function simply return Ok
     /// for encrypted chunks.
-    /// Note: This does not call verify_crc
+    /// Note: This does not call verify_crc, because this is usually done in load
     pub fn verify_unencrypted(
         &self,
         expected_chunk_size: usize,

src/backup/datastore.rs

@@ -499,28 +499,43 @@ impl DataStore {
     }
 
     pub fn verify_stored_chunk(&self, digest: &[u8; 32], expected_chunk_size: u64) -> Result<(), Error> {
-        let blob = self.chunk_store.read_chunk(digest)?;
-        blob.verify_crc()?;
+        let blob = self.load_chunk(digest)?;
         blob.verify_unencrypted(expected_chunk_size as usize, digest)?;
         Ok(())
     }
 
-    pub fn load_blob(&self, backup_dir: &BackupDir, filename: &str) -> Result<(DataBlob, u64), Error> {
+    pub fn load_blob(&self, backup_dir: &BackupDir, filename: &str) -> Result<DataBlob, Error> {
         let mut path = self.base_path();
         path.push(backup_dir.relative_path());
         path.push(filename);
 
-        let raw_data = proxmox::tools::fs::file_get_contents(&path)?;
-        let raw_size = raw_data.len() as u64;
-        let blob = DataBlob::from_raw(raw_data)?;
-        Ok((blob, raw_size))
+        proxmox::try_block!({
+            let mut file = std::fs::File::open(&path)?;
+            DataBlob::load_from_reader(&mut file)
+        }).map_err(|err| format_err!("unable to load blob '{:?}' - {}", path, err))
+    }
+    
+    pub fn load_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
+
+        let (chunk_path, digest_str) = self.chunk_store.chunk_path(digest);
+
+        proxmox::try_block!({
+            let mut file = std::fs::File::open(&chunk_path)?;
+            DataBlob::load_from_reader(&mut file)
+        }).map_err(|err| format_err!(
+            "store '{}', unable to load chunk '{}' - {}",
+            self.name(),
+            digest_str,
+            err,
+        ))
      }
     
     pub fn load_manifest(
         &self,
         backup_dir: &BackupDir,
     ) -> Result<(BackupManifest, CryptMode, u64), Error> {
-        let (blob, raw_size) = self.load_blob(backup_dir, MANIFEST_BLOB_NAME)?;
+        let blob = self.load_blob(backup_dir, MANIFEST_BLOB_NAME)?;
+        let raw_size = blob.raw_size();
         let crypt_mode = blob.crypt_mode()?;
         let manifest = BackupManifest::try_from(blob)?;
         Ok((manifest, crypt_mode, raw_size))

src/backup/read_chunk.rs

@@ -34,12 +34,7 @@ impl LocalChunkReader {
 
 impl ReadChunk for LocalChunkReader {
     fn read_raw_chunk(&self, digest: &[u8; 32]) -> Result<DataBlob, Error> {
-        let (path, _) = self.store.chunk_path(digest);
-        let raw_data = proxmox::tools::fs::file_get_contents(&path)?;
-        let chunk = DataBlob::from_raw(raw_data)?;
-        chunk.verify_crc()?;
-
-        Ok(chunk)
+        self.store.load_chunk(digest)
     }
 
     fn read_chunk(&self, digest: &[u8; 32]) -> Result<Vec<u8>, Error> {
@@ -76,8 +71,8 @@ impl AsyncReadChunk for LocalChunkReader {
             let (path, _) = self.store.chunk_path(digest);
 
             let raw_data = tokio::fs::read(&path).await?;
-            let chunk = DataBlob::from_raw(raw_data)?;
-            chunk.verify_crc()?;
+
+            let chunk = DataBlob::load_from_reader(&mut &raw_data[..])?;
            
             Ok(chunk)
         })

src/backup/verify.rs

@@ -10,19 +10,18 @@ use super::{
 
 fn verify_blob(datastore: &DataStore, backup_dir: &BackupDir, info: &FileInfo) -> Result<(), Error> {
 
-    let (blob, raw_size) = datastore.load_blob(backup_dir, &info.filename)?;
+    let blob = datastore.load_blob(backup_dir, &info.filename)?;
 
-    let csum = openssl::sha::sha256(blob.raw_data());
+    let raw_size = blob.raw_size();    
     if raw_size != info.size {
         bail!("wrong size ({} != {})", info.size, raw_size);
     }
 
+    let csum = openssl::sha::sha256(blob.raw_data());
     if csum != info.csum {
         bail!("wrong index checksum");
     }
 
-    blob.verify_crc()?;
-
     let magic = blob.magic();
 
     if magic == &ENCR_COMPR_BLOB_MAGIC_1_0 || magic == &ENCRYPTED_BLOB_MAGIC_1_0 {

src/client/backup_reader.rs

@@ -129,8 +129,7 @@ impl BackupReader {
 
         let mut raw_data = Vec::with_capacity(64 * 1024);
         self.download(MANIFEST_BLOB_NAME, &mut raw_data).await?;
-        let blob = DataBlob::from_raw(raw_data)?;
-        blob.verify_crc()?;
+        let blob = DataBlob::load_from_reader(&mut &raw_data[..])?;
         let data = blob.decode(None)?;
 
         let manifest = BackupManifest::from_data(&data[..], self.crypt_config.as_ref().map(Arc::as_ref))?;

src/client/backup_writer.rs

@@ -479,8 +479,7 @@ impl BackupWriter {
         let param = json!({ "archive-name": MANIFEST_BLOB_NAME });
         self.h2.download("previous", Some(param), &mut raw_data).await?;
 
-        let blob = DataBlob::from_raw(raw_data)?;
-        blob.verify_crc()?;
+        let blob = DataBlob::load_from_reader(&mut &raw_data[..])?;
         let data = blob.decode(self.crypt_config.as_ref().map(Arc::as_ref))?;
 
         let manifest = BackupManifest::from_data(&data[..], self.crypt_config.as_ref().map(Arc::as_ref))?;

src/client/pull.rs

@@ -174,16 +174,14 @@ async fn pull_snapshot(
             };
         },
     };
-    let tmp_manifest_blob = DataBlob::load(&mut tmp_manifest_file)?;
-    tmp_manifest_blob.verify_crc()?;
+    let tmp_manifest_blob = DataBlob::load_from_reader(&mut tmp_manifest_file)?;
 
     if manifest_name.exists() {
         let manifest_blob = proxmox::try_block!({
             let mut manifest_file = std::fs::File::open(&manifest_name)
                 .map_err(|err| format_err!("unable to open local manifest {:?} - {}", manifest_name, err))?;
 
-            let manifest_blob = DataBlob::load(&mut manifest_file)?;
-            manifest_blob.verify_crc()?;
+            let manifest_blob = DataBlob::load_from_reader(&mut manifest_file)?;
             Ok(manifest_blob)
         }).map_err(|err: Error| {
             format_err!("unable to read local manifest {:?} - {}", manifest_name, err)

src/client/remote_chunk_reader.rs

@@ -42,8 +42,9 @@ impl RemoteChunkReader {
             .download_chunk(&digest, &mut chunk_data)
             .await?;
 
-        let chunk = DataBlob::from_raw(chunk_data)?;
-        chunk.verify_crc()?;
+        let chunk = DataBlob::load_from_reader(&mut &chunk_data[..])?;
+        
+        // fixme: verify digest?
 
         Ok(chunk)
     }

tests/blob_writer.rs

@@ -50,8 +50,7 @@ fn verify_test_blob(mut cursor: Cursor<Vec<u8>>) -> Result<(), Error> {
 
     let raw_data = cursor.into_inner();
 
-    let blob = DataBlob::from_raw(raw_data)?;
-    blob.verify_crc()?;
+    let blob = DataBlob::load_from_reader(&mut &raw_data[..])?;
 
     let data = blob.decode(Some(&CRYPT_CONFIG))?;
     if data != *TEST_DATA {