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introduce a CryptMode enum

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This also replaces the recently introduced --encryption
parameter on the client with a --crypt-mode parameter.

This can be "none", "encrypt" or "sign-only".

Note that this introduces various changes in the API types
which previously did not take the above distinction into
account properly:

Both `BackupContent` and the manifest's `FileInfo`:
    lose `encryption: Option<bool>`
    gain `crypt_mode: Option<CryptMode>`

Within the backup manifest itself, the "crypt-mode" property
will always be set.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-07-07 15:20:20 +02:00
parent 56b814e378
commit f28d9088ed
6 changed files with 134 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/api2/admin/datastore.rs
View File

@ -52,14 +52,14 @@ fn read_backup_index(store: &DataStore, backup_dir: &BackupDir) -> Result<Vec<Ba
for item in manifest.files() {
result.push(BackupContent {
filename: item.filename.clone(),
encrypted: item.encrypted,
crypt_mode: Some(item.crypt_mode),
size: Some(item.size),
});
}
result.push(BackupContent {
filename: MANIFEST_BLOB_NAME.to_string(),
encrypted: Some(false),
crypt_mode: None,
size: Some(index_size),
});
@ -79,7 +79,11 @@ fn get_all_snapshot_files(
for file in &info.files {
if file_set.contains(file) { continue; }
files.push(BackupContent { filename: file.to_string(), size: None, encrypted: None });
files.push(BackupContent {
filename: file.to_string(),
size: None,
crypt_mode: None,
});
}
Ok(files)
@ -350,7 +354,15 @@ pub fn list_snapshots (
},
Err(err) => {
eprintln!("error during snapshot file listing: '{}'", err);
info.files.iter().map(|x| BackupContent { filename: x.to_string(), size: None, encrypted: None }).collect()
info
.files
.iter()
.map(|x| BackupContent {
filename: x.to_string(),
size: None,
crypt_mode: None,
})
.collect()
},
};
@ -902,7 +914,7 @@ fn download_file_decoded(
let files = read_backup_index(&datastore, &backup_dir)?;
for file in files {
if file.filename == file_name && file.encrypted == Some(true) {
if file.filename == file_name && file.crypt_mode == Some(CryptMode::Encrypt) {
bail!("cannot decode '{}' - is encrypted", file_name);
}
}

10
src/api2/types.rs
View File

@ -5,6 +5,8 @@ use proxmox::api::{api, schema::*};
use proxmox::const_regex;
use proxmox::{IPRE, IPV4RE, IPV6RE, IPV4OCTET, IPV6H16, IPV6LS32};
use crate::backup::CryptMode;
// File names: may not contain slashes, may not start with "."
pub const FILENAME_FORMAT: ApiStringFormat = ApiStringFormat::VerifyFn(|name| {
if name.starts_with('.') {
@ -496,6 +498,10 @@ pub const PRUNE_SCHEMA_KEEP_YEARLY: Schema = IntegerSchema::new(
"filename": {
schema: BACKUP_ARCHIVE_NAME_SCHEMA,
},
"crypt-mode": {
type: CryptMode,
optional: true,
},
},
)]
#[derive(Serialize, Deserialize)]
@ -503,9 +509,9 @@ pub const PRUNE_SCHEMA_KEEP_YEARLY: Schema = IntegerSchema::new(
/// Basic information about archive files inside a backup snapshot.
pub struct BackupContent {
pub filename: String,
/// Info if file is encrypted (or empty if we do not have that info)
/// Info if file is encrypted, signed, or neither.
#[serde(skip_serializing_if="Option::is_none")]
pub encrypted: Option<bool>,
pub crypt_mode: Option<CryptMode>,
/// Archive size (from backup manifest).
#[serde(skip_serializing_if="Option::is_none")]
pub size: Option<u64>,

37
src/backup/crypt_config.rs
View File

@ -6,12 +6,40 @@
//! See the Wikipedia Artikel for [Authenticated
//! encryption](https://en.wikipedia.org/wiki/Authenticated_encryption)
//! for a short introduction.
use anyhow::{bail, Error};
use openssl::pkcs5::pbkdf2_hmac;
use openssl::hash::MessageDigest;
use openssl::symm::{decrypt_aead, Cipher, Crypter, Mode};
use std::io::Write;
use anyhow::{bail, Error};
use chrono::{Local, TimeZone, DateTime};
use openssl::hash::MessageDigest;
use openssl::pkcs5::pbkdf2_hmac;
use openssl::symm::{decrypt_aead, Cipher, Crypter, Mode};
use serde::{Deserialize, Serialize};
use proxmox::api::api;
#[api(default: "encrypt")]
#[derive(Copy, Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
#[serde(rename_all = "kebab-case")]
/// Defines whether data is encrypted (using an AEAD cipher), only signed, or neither.
pub enum CryptMode {
/// Don't encrypt.
None,
/// Encrypt.
Encrypt,
/// Only sign.
SignOnly,
}
impl CryptMode {
/// Maps values other than `None` to `SignOnly`.
pub fn sign_only(self) -> Self {
match self {
CryptMode::None => CryptMode::None,
_ => CryptMode::SignOnly,
}
}
}
/// Encryption Configuration with secret key
///
@ -26,7 +54,6 @@ pub struct CryptConfig {
id_pkey: openssl::pkey::PKey<openssl::pkey::Private>,
// The private key used by the cipher.
enc_key: [u8; 32],
}
impl CryptConfig {

24
src/backup/manifest.rs
View File

@ -4,14 +4,14 @@ use std::path::Path;
use serde_json::{json, Value};
use crate::backup::BackupDir;
use crate::backup::{BackupDir, CryptMode};
pub const MANIFEST_BLOB_NAME: &str = "index.json.blob";
pub const CLIENT_LOG_BLOB_NAME: &str = "client.log.blob";
pub struct FileInfo {
pub filename: String,
pub encrypted: Option<bool>,
pub crypt_mode: CryptMode,
pub size: u64,
pub csum: [u8; 32],
}
@ -49,9 +49,9 @@ impl BackupManifest {
Self { files: Vec::new(), snapshot }
}
pub fn add_file(&mut self, filename: String, size: u64, csum: [u8; 32], encrypted: Option<bool>) -> Result<(), Error> {
pub fn add_file(&mut self, filename: String, size: u64, csum: [u8; 32], crypt_mode: CryptMode) -> Result<(), Error> {
let _archive_type = archive_type(&filename)?; // check type
self.files.push(FileInfo { filename, size, csum, encrypted });
self.files.push(FileInfo { filename, size, csum, crypt_mode });
Ok(())
}
@ -91,18 +91,12 @@ impl BackupManifest {
"backup-time": self.snapshot.backup_time().timestamp(),
"files": self.files.iter()
.fold(Vec::new(), |mut acc, info| {
let mut value = json!({
acc.push(json!({
"filename": info.filename,
"encrypted": info.encrypted,
"crypt-mode": info.crypt_mode,
"size": info.size,
"csum": proxmox::tools::digest_to_hex(&info.csum),
});
if let Some(encrypted) = info.encrypted {
value["encrypted"] = encrypted.into();
}
acc.push(value);
}));
acc
})
})
@ -142,8 +136,8 @@ impl TryFrom<Value> for BackupManifest {
let csum = required_string_property(item, "csum")?;
let csum = proxmox::tools::hex_to_digest(csum)?;
let size = required_integer_property(item, "size")? as u64;
let encrypted = item["encrypted"].as_bool();
manifest.add_file(filename, size, csum, encrypted)?;
let crypt_mode: CryptMode = serde_json::from_value(item["crypt-mode"].clone())?;
manifest.add_file(filename, size, csum, crypt_mode)?;
}
if manifest.files().is_empty() {

90
src/bin/proxmox-backup-client.rs
View File

@ -35,11 +35,12 @@ use proxmox_backup::backup::{
BackupGroup,
BackupManifest,
BufferedDynamicReader,
CATALOG_NAME,
CatalogReader,
CatalogWriter,
CATALOG_NAME,
ChunkStream,
CryptConfig,
CryptMode,
DataBlob,
DynamicIndexReader,
FixedChunkStream,
@ -664,34 +665,41 @@ fn spawn_catalog_upload(
Ok((catalog, catalog_result_rx))
}
fn keyfile_parameters(param: &Value) -> Result<Option<PathBuf>, Error> {
Ok(match (param.get("keyfile"), param.get("encryption")) {
fn keyfile_parameters(param: &Value) -> Result<(Option<PathBuf>, CryptMode), Error> {
let keyfile = match param.get("keyfile") {
Some(Value::String(keyfile)) => Some(keyfile),
Some(_) => bail!("bad --keyfile parameter type"),
None => None,
};
let crypt_mode: Option<CryptMode> = match param.get("crypt-mode") {
Some(mode) => Some(serde_json::from_value(mode.clone())?),
None => None,
};
Ok(match (keyfile, crypt_mode) {
// no parameters:
(None, None) => key::optional_default_key_path()?,
(None, None) => (key::optional_default_key_path()?, CryptMode::Encrypt),
// just --encryption=false
(None, Some(Value::Bool(false))) => None,
// just --crypt-mode=none
(None, Some(CryptMode::None)) => (None, CryptMode::None),
// just --encryption=true
(None, Some(Value::Bool(true))) => match key::optional_default_key_path()? {
None => bail!("--encryption=false without --keyfile and no default key file available"),
Some(path) => Some(path),
// just --crypt-mode other than none
(None, Some(crypt_mode)) => match key::optional_default_key_path()? {
None => bail!("--crypt-mode without --keyfile and no default key file available"),
Some(path) => (Some(path), crypt_mode),
}
// just --keyfile
(Some(Value::String(keyfile)), None) => Some(PathBuf::from(keyfile)),
(Some(keyfile), None) => (Some(PathBuf::from(keyfile)), CryptMode::Encrypt),
// --keyfile and --encryption=false
(Some(Value::String(_)), Some(Value::Bool(false))) => {
bail!("--keyfile and --encryption=false are mutually exclusive");
// --keyfile and --crypt-mode=none
(Some(_), Some(CryptMode::None)) => {
bail!("--keyfile and --crypt-mode=none are mutually exclusive");
}
// --keyfile and --encryption=true
(Some(Value::String(keyfile)), Some(Value::Bool(true))) => Some(PathBuf::from(keyfile)),
// wrong value types:
(Some(_), _) => bail!("bad --keyfile parameter"),
(_, Some(_)) => bail!("bad --encryption parameter"),
// --keyfile and --crypt-mode other than none
(Some(keyfile), Some(crypt_mode)) => (Some(PathBuf::from(keyfile)), crypt_mode),
})
}
@ -794,7 +802,7 @@ async fn create_backup(
verify_chunk_size(size)?;
}
let keyfile = keyfile_parameters(&param)?;
let (keyfile, crypt_mode) = keyfile_parameters(&param)?;
let backup_id = param["backup-id"].as_str().unwrap_or(&proxmox::tools::nodename());
@ -912,8 +920,6 @@ async fn create_backup(
}
};
let is_encrypted = Some(crypt_config.is_some());
let client = BackupWriter::start(
client,
crypt_config.clone(),
@ -941,16 +947,16 @@ async fn create_backup(
BackupSpecificationType::CONFIG => {
println!("Upload config file '{}' to '{:?}' as {}", filename, repo, target);
let stats = client
.upload_blob_from_file(&filename, &target, true, Some(true))
.upload_blob_from_file(&filename, &target, true, crypt_mode)
.await?;
manifest.add_file(target, stats.size, stats.csum, is_encrypted)?;
manifest.add_file(target, stats.size, stats.csum, crypt_mode)?;
}
BackupSpecificationType::LOGFILE => { // fixme: remove - not needed anymore ?
println!("Upload log file '{}' to '{:?}' as {}", filename, repo, target);
let stats = client
.upload_blob_from_file(&filename, &target, true, Some(true))
.upload_blob_from_file(&filename, &target, true, crypt_mode)
.await?;
manifest.add_file(target, stats.size, stats.csum, is_encrypted)?;
manifest.add_file(target, stats.size, stats.csum, crypt_mode)?;
}
BackupSpecificationType::PXAR => {
// start catalog upload on first use
@ -976,7 +982,7 @@ async fn create_backup(
pattern_list.clone(),
entries_max as usize,
).await?;
manifest.add_file(target, stats.size, stats.csum, is_encrypted)?;
manifest.add_file(target, stats.size, stats.csum, crypt_mode)?;
catalog.lock().unwrap().end_directory()?;
}
BackupSpecificationType::IMAGE => {
@ -990,7 +996,7 @@ async fn create_backup(
chunk_size_opt,
verbose,
).await?;
manifest.add_file(target, stats.size, stats.csum, is_encrypted)?;
manifest.add_file(target, stats.size, stats.csum, crypt_mode)?;
}
}
}
@ -1007,7 +1013,7 @@ async fn create_backup(
if let Some(catalog_result_rx) = catalog_result_tx {
let stats = catalog_result_rx.await??;
manifest.add_file(CATALOG_NAME.to_owned(), stats.size, stats.csum, is_encrypted)?;
manifest.add_file(CATALOG_NAME.to_owned(), stats.size, stats.csum, crypt_mode)?;
}
}
@ -1015,9 +1021,9 @@ async fn create_backup(
let target = "rsa-encrypted.key";
println!("Upload RSA encoded key to '{:?}' as {}", repo, target);
let stats = client
.upload_blob_from_data(rsa_encrypted_key, target, false, None)
.upload_blob_from_data(rsa_encrypted_key, target, false, CryptMode::None)
.await?;
manifest.add_file(format!("{}.blob", target), stats.size, stats.csum, is_encrypted)?;
manifest.add_file(format!("{}.blob", target), stats.size, stats.csum, crypt_mode)?;
// openssl rsautl -decrypt -inkey master-private.pem -in rsa-encrypted.key -out t
/*
@ -1035,7 +1041,7 @@ async fn create_backup(
println!("Upload index.json to '{:?}'", repo);
let manifest = serde_json::to_string_pretty(&manifest)?.into();
client
.upload_blob_from_data(manifest, MANIFEST_BLOB_NAME, true, Some(true))
.upload_blob_from_data(manifest, MANIFEST_BLOB_NAME, true, crypt_mode.sign_only())
.await?;
client.finish().await?;
@ -1193,7 +1199,7 @@ async fn restore(param: Value) -> Result<Value, Error> {
let target = tools::required_string_param(&param, "target")?;
let target = if target == "-" { None } else { Some(target) };
let keyfile = keyfile_parameters(&param)?;
let (keyfile, _crypt_mode) = keyfile_parameters(&param)?;
let crypt_config = match keyfile {
None => None,
@ -1341,7 +1347,7 @@ async fn upload_log(param: Value) -> Result<Value, Error> {
let mut client = connect(repo.host(), repo.user())?;
let keyfile = keyfile_parameters(&param)?;
let (keyfile, crypt_mode) = keyfile_parameters(&param)?;
let crypt_config = match keyfile {
None => None,
@ -1354,7 +1360,19 @@ async fn upload_log(param: Value) -> Result<Value, Error> {
let data = file_get_contents(logfile)?;
let blob = DataBlob::encode(&data, crypt_config.as_ref().map(Arc::as_ref), true)?;
let blob = match crypt_mode {
CryptMode::None => DataBlob::encode(&data, None, true)?,
CryptMode::Encrypt => {
DataBlob::encode(&data, crypt_config.as_ref().map(Arc::as_ref), true)?
}
CryptMode::SignOnly => DataBlob::create_signed(
&data,
crypt_config
.ok_or_else(|| format_err!("cannot sign without crypt config"))?
.as_ref(),
true,
)?,
};
let raw_data = blob.into_inner();

32
src/client/backup_writer.rs
View File

@ -3,7 +3,7 @@ use std::os::unix::fs::OpenOptionsExt;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::{Arc, Mutex};
use anyhow::{format_err, Error};
use anyhow::{bail, format_err, Error};
use chrono::{DateTime, Utc};
use futures::*;
use futures::stream::Stream;
@ -163,21 +163,17 @@ impl BackupWriter {
data: Vec<u8>,
file_name: &str,
compress: bool,
crypt_or_sign: Option<bool>,
) -> Result<BackupStats, Error> {
let blob = if let Some(ref crypt_config) = self.crypt_config {
if let Some(encrypt) = crypt_or_sign {
if encrypt {
DataBlob::encode(&data, Some(crypt_config), compress)?
} else {
DataBlob::create_signed(&data, crypt_config, compress)?
}
} else {
DataBlob::encode(&data, None, compress)?
}
} else {
DataBlob::encode(&data, None, compress)?
crypt_mode: CryptMode,
) -> Result<BackupStats, Error> {
let blob = match (crypt_mode, &self.crypt_config) {
(CryptMode::None, _) => DataBlob::encode(&data, None, compress)?,
(_, None) => bail!("requested encryption/signing without a crypt config"),
(CryptMode::Encrypt, Some(crypt_config)) => {
DataBlob::encode(&data, Some(crypt_config), compress)?
}
(CryptMode::SignOnly, Some(crypt_config)) => {
DataBlob::create_signed(&data, crypt_config, compress)?
}
};
let raw_data = blob.into_inner();
@ -194,7 +190,7 @@ impl BackupWriter {
src_path: P,
file_name: &str,
compress: bool,
crypt_or_sign: Option<bool>,
crypt_mode: CryptMode,
) -> Result<BackupStats, Error> {
let src_path = src_path.as_ref();
@ -209,7 +205,7 @@ impl BackupWriter {
.await
.map_err(|err| format_err!("unable to read file {:?} - {}", src_path, err))?;
self.upload_blob_from_data(contents, file_name, compress, crypt_or_sign).await
self.upload_blob_from_data(contents, file_name, compress, crypt_mode).await
}
pub async fn upload_stream(