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crypto: Split out the signing module into two files.

master
Damir Jelić 2020-10-26 14:49:24 +01:00
parent 5c14910126
commit 6e83a4bbca
4 changed files with 390 additions and 349 deletions
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4
matrix_sdk_common/Cargo.toml
View File

@ -20,8 +20,8 @@ js_int = "0.1.9"
[dependencies.ruma]
version = "0.0.1"
path = "/home/poljar/werk/priv/ruma/ruma"
rev = "db2f58032953ccb6d8ae712d64d713ebdf412598"
git = "https://github.com/ruma/ruma"
rev = "c0eee624311c12ee9c3eb14737988e3f0a60fb3f"
features = ["client-api", "unstable-pre-spec", "unstable-exhaustive-types"]
[target.'cfg(not(target_arch = "wasm32"))'.dependencies]

354
matrix_sdk_crypto/src/olm/signing.rs → matrix_sdk_crypto/src/olm/signing/mod.rs
View File

@ -14,18 +14,11 @@
#![allow(dead_code, missing_docs)]
use aes_gcm::{
aead::{generic_array::GenericArray, Aead, NewAead},
Aes256Gcm,
};
use base64::{decode_config, encode_config, DecodeError, URL_SAFE_NO_PAD};
use getrandom::getrandom;
use matrix_sdk_common::{
encryption::DeviceKeys,
identifiers::{DeviceKeyAlgorithm, DeviceKeyId},
};
mod pk_signing;
use matrix_sdk_common::encryption::DeviceKeys;
use serde::{Deserialize, Serialize};
use serde_json::{Error as JsonError, Value};
use serde_json::Error as JsonError;
use std::{
collections::BTreeMap,
sync::{
@ -33,211 +26,18 @@ use std::{
Arc,
},
};
use thiserror::Error;
use zeroize::Zeroizing;
use olm_rs::{errors::OlmUtilityError, pk::OlmPkSigning, utility::OlmUtility};
use matrix_sdk_common::{
api::r0::keys::{
upload_signatures::Request as SignatureUploadRequest, CrossSigningKey, KeyUsage,
},
api::r0::keys::{upload_signatures::Request as SignatureUploadRequest, KeyUsage},
identifiers::UserId,
locks::Mutex,
};
use crate::{
error::SignatureError,
identities::{MasterPubkey, SelfSigningPubkey, UserSigningPubkey},
requests::UploadSigningKeysRequest,
UserIdentity,
};
use crate::{error::SignatureError, requests::UploadSigningKeysRequest};
use crate::ReadOnlyAccount;
const NONCE_SIZE: usize = 12;
fn encode<T: AsRef<[u8]>>(input: T) -> String {
encode_config(input, URL_SAFE_NO_PAD)
}
fn decode<T: AsRef<[u8]>>(input: T) -> Result<Vec<u8>, DecodeError> {
decode_config(input, URL_SAFE_NO_PAD)
}
/// Error type reporting failures in the Signign operations.
#[derive(Debug, Error)]
pub enum SigningError {
/// Error decoding the base64 encoded pickle data.
#[error(transparent)]
Decode(#[from] DecodeError),
/// Error decrypting the pickled signing seed
#[error("Error decrypting the pickled signign seed")]
Decryption(String),
/// Error deserializing the pickle data.
#[error(transparent)]
Json(#[from] JsonError),
}
#[derive(Clone)]
pub struct Signing {
inner: Arc<Mutex<OlmPkSigning>>,
seed: Arc<Zeroizing<Vec<u8>>>,
public_key: PublicSigningKey,
}
impl std::fmt::Debug for Signing {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Signing")
.field("public_key", &self.public_key.as_str())
.finish()
}
}
impl PartialEq for Signing {
fn eq(&self, other: &Signing) -> bool {
self.seed == other.seed
}
}
#[derive(Clone, PartialEq, Debug)]
struct MasterSigning {
inner: Signing,
public_key: MasterPubkey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
struct PickledMasterSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
struct PickledUserSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
struct PickledSelfSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
impl MasterSigning {
async fn pickle(&self, pickle_key: &[u8]) -> PickledMasterSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledMasterSigning { pickle, public_key }
}
fn from_pickle(pickle: PickledMasterSigning, pickle_key: &[u8]) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
async fn sign_subkey<'a>(&self, subkey: &mut CrossSigningKey) {
// TODO create a borrowed version of a cross singing key.
let subkey_wihtout_signatures = CrossSigningKey {
user_id: subkey.user_id.clone(),
keys: subkey.keys.clone(),
usage: subkey.usage.clone(),
signatures: BTreeMap::new(),
};
let message = cjson::to_string(&subkey_wihtout_signatures)
.expect("Can't serialize cross signing subkey");
let signature = self.inner.sign(&message).await;
subkey
.signatures
.entry(self.public_key.user_id().to_owned())
.or_insert_with(BTreeMap::new)
.insert(
format!("ed25519:{}", self.inner.public_key().as_str()),
signature.0,
);
}
}
impl UserSigning {
async fn pickle(&self, pickle_key: &[u8]) -> PickledUserSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledUserSigning { pickle, public_key }
}
async fn sign_user(&self, _: &UserIdentity) -> BTreeMap<UserId, BTreeMap<String, Value>> {
todo!();
}
fn from_pickle(pickle: PickledUserSigning, pickle_key: &[u8]) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
}
impl SelfSigning {
async fn pickle(&self, pickle_key: &[u8]) -> PickledSelfSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledSelfSigning { pickle, public_key }
}
async fn sign_device_raw(&self, value: Value) -> Result<Signature, SignatureError> {
self.inner.sign_json(value).await
}
async fn sign_device(&self, device_keys: &mut DeviceKeys) -> Result<(), SignatureError> {
let json_device = serde_json::to_value(&device_keys)?;
let signature = self.sign_device_raw(json_device).await?;
device_keys
.signatures
.entry(self.public_key.user_id().to_owned())
.or_insert_with(BTreeMap::new)
.insert(
DeviceKeyId::from_parts(
DeviceKeyAlgorithm::Ed25519,
self.inner.public_key.as_str().into(),
),
signature.0,
);
Ok(())
}
fn from_pickle(pickle: PickledSelfSigning, pickle_key: &[u8]) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
}
#[derive(Clone, PartialEq, Debug)]
struct SelfSigning {
inner: Signing,
public_key: SelfSigningPubkey,
}
#[derive(Clone, PartialEq, Debug)]
struct UserSigning {
inner: Signing,
public_key: UserSigningPubkey,
}
use pk_signing::{MasterSigning, PickledSignings, SelfSigning, Signing, SigningError, UserSigning};
#[derive(Clone, Debug)]
pub struct PrivateCrossSigningIdentity {
@ -255,146 +55,6 @@ pub struct PickledCrossSigningIdentity {
pub pickle: String,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
struct PickledSignings {
master_key: Option<PickledMasterSigning>,
user_signing_key: Option<PickledUserSigning>,
self_signing_key: Option<PickledSelfSigning>,
}
#[derive(Debug, Clone)]
pub struct Signature(String);
#[derive(Debug, Clone, Serialize, Deserialize)]
struct PickledSigning(String);
#[derive(Debug, Clone, Serialize, Deserialize)]
struct InnerPickle {
version: u8,
nonce: String,
ciphertext: String,
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct PublicSigningKey(Arc<String>);
impl Signature {
fn as_str(&self) -> &str {
&self.0
}
}
impl PickledSigning {
fn as_str(&self) -> &str {
&self.0
}
}
impl PublicSigningKey {
fn as_str(&self) -> &str {
&self.0
}
#[allow(clippy::inherent_to_string)]
fn to_string(&self) -> String {
self.0.to_string()
}
}
impl Signing {
fn new() -> Self {
let seed = OlmPkSigning::generate_seed();
Self::from_seed(seed)
}
fn from_seed(seed: Vec<u8>) -> Self {
let inner = OlmPkSigning::new(seed.clone()).expect("Unable to create pk signing object");
let public_key = PublicSigningKey(Arc::new(inner.public_key().to_owned()));
Signing {
inner: Arc::new(Mutex::new(inner)),
seed: Arc::new(Zeroizing::from(seed)),
public_key,
}
}
fn from_pickle(pickle: PickledSigning, pickle_key: &[u8]) -> Result<Self, SigningError> {
let pickled: InnerPickle = serde_json::from_str(pickle.as_str())?;
let key = GenericArray::from_slice(pickle_key);
let cipher = Aes256Gcm::new(key);
let nonce = decode(pickled.nonce)?;
let nonce = GenericArray::from_slice(&nonce);
let ciphertext = &decode(pickled.ciphertext)?;
let seed = cipher
.decrypt(&nonce, ciphertext.as_slice())
.map_err(|e| SigningError::Decryption(e.to_string()))?;
Ok(Self::from_seed(seed))
}
async fn pickle(&self, pickle_key: &[u8]) -> PickledSigning {
let key = GenericArray::from_slice(pickle_key);
let cipher = Aes256Gcm::new(key);
let mut nonce = vec![0u8; NONCE_SIZE];
getrandom(&mut nonce).expect("Can't generate nonce to pickle the signing object");
let nonce = GenericArray::from_slice(nonce.as_slice());
let ciphertext = cipher
.encrypt(nonce, self.seed.as_slice())
.expect("Can't encrypt signing pickle");
let ciphertext = encode(ciphertext);
let pickle = InnerPickle {
version: 1,
nonce: encode(nonce.as_slice()),
ciphertext,
};
PickledSigning(serde_json::to_string(&pickle).expect("Can't encode pickled signing"))
}
fn public_key(&self) -> &PublicSigningKey {
&self.public_key
}
fn cross_signing_key(&self, user_id: UserId, usage: KeyUsage) -> CrossSigningKey {
let mut keys = BTreeMap::new();
keys.insert(
format!("ed25519:{}", self.public_key().as_str()),
self.public_key().to_string(),
);
CrossSigningKey {
user_id,
usage: vec![usage],
keys,
signatures: BTreeMap::new(),
}
}
async fn verify(&self, message: &str, signature: &Signature) -> Result<bool, OlmUtilityError> {
let utility = OlmUtility::new();
utility.ed25519_verify(self.public_key.as_str(), message, signature.as_str())
}
async fn sign_json(&self, mut json: Value) -> Result<Signature, SignatureError> {
let json_object = json.as_object_mut().ok_or(SignatureError::NotAnObject)?;
let _ = json_object.remove("signatures");
let canonical_json = cjson::to_string(json_object)?;
Ok(self.sign(&canonical_json).await)
}
async fn sign(&self, message: &str) -> Signature {
Signature(self.inner.lock().await.sign(message))
}
}
impl PrivateCrossSigningIdentity {
pub fn user_id(&self) -> &UserId {
&self.user_id

380
matrix_sdk_crypto/src/olm/signing/pk_signing.rs Normal file
View File

@ -0,0 +1,380 @@
// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use aes_gcm::{
aead::{generic_array::GenericArray, Aead, NewAead},
Aes256Gcm,
};
use base64::{decode_config, encode_config, DecodeError, URL_SAFE_NO_PAD};
use getrandom::getrandom;
use matrix_sdk_common::{
encryption::DeviceKeys,
identifiers::{DeviceKeyAlgorithm, DeviceKeyId},
};
use serde::{Deserialize, Serialize};
use serde_json::{Error as JsonError, Value};
use std::{collections::BTreeMap, sync::Arc};
use thiserror::Error;
use zeroize::Zeroizing;
use olm_rs::{errors::OlmUtilityError, pk::OlmPkSigning, utility::OlmUtility};
use matrix_sdk_common::{
api::r0::keys::{CrossSigningKey, KeyUsage},
identifiers::UserId,
locks::Mutex,
};
use crate::{
error::SignatureError,
identities::{MasterPubkey, SelfSigningPubkey, UserSigningPubkey},
UserIdentity,
};
const NONCE_SIZE: usize = 12;
fn encode<T: AsRef<[u8]>>(input: T) -> String {
encode_config(input, URL_SAFE_NO_PAD)
}
fn decode<T: AsRef<[u8]>>(input: T) -> Result<Vec<u8>, DecodeError> {
decode_config(input, URL_SAFE_NO_PAD)
}
/// Error type reporting failures in the Signign operations.
#[derive(Debug, Error)]
pub enum SigningError {
/// Error decoding the base64 encoded pickle data.
#[error(transparent)]
Decode(#[from] DecodeError),
/// Error decrypting the pickled signing seed
#[error("Error decrypting the pickled signign seed")]
Decryption(String),
/// Error deserializing the pickle data.
#[error(transparent)]
Json(#[from] JsonError),
}
#[derive(Clone)]
pub struct Signing {
inner: Arc<Mutex<OlmPkSigning>>,
seed: Arc<Zeroizing<Vec<u8>>>,
public_key: PublicSigningKey,
}
impl std::fmt::Debug for Signing {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Signing")
.field("public_key", &self.public_key.as_str())
.finish()
}
}
impl PartialEq for Signing {
fn eq(&self, other: &Signing) -> bool {
self.seed == other.seed
}
}
#[derive(Debug, Clone, Serialize, Deserialize)]
struct InnerPickle {
version: u8,
nonce: String,
ciphertext: String,
}
#[derive(Clone, PartialEq, Debug)]
pub struct MasterSigning {
pub inner: Signing,
pub public_key: MasterPubkey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct PickledMasterSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct PickledUserSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct PickledSelfSigning {
pickle: PickledSigning,
public_key: CrossSigningKey,
}
impl Signature {
pub fn as_str(&self) -> &str {
&self.0
}
}
impl PickledSigning {
pub fn as_str(&self) -> &str {
&self.0
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PublicSigningKey(Arc<String>);
impl PublicSigningKey {
pub fn as_str(&self) -> &str {
&self.0
}
#[allow(clippy::inherent_to_string)]
fn to_string(&self) -> String {
self.0.to_string()
}
}
impl MasterSigning {
pub async fn pickle(&self, pickle_key: &[u8]) -> PickledMasterSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledMasterSigning { pickle, public_key }
}
pub fn from_pickle(
pickle: PickledMasterSigning,
pickle_key: &[u8],
) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
pub async fn sign_subkey<'a>(&self, subkey: &mut CrossSigningKey) {
// TODO create a borrowed version of a cross singing key.
let subkey_wihtout_signatures = CrossSigningKey {
user_id: subkey.user_id.clone(),
keys: subkey.keys.clone(),
usage: subkey.usage.clone(),
signatures: BTreeMap::new(),
};
let message = cjson::to_string(&subkey_wihtout_signatures)
.expect("Can't serialize cross signing subkey");
let signature = self.inner.sign(&message).await;
subkey
.signatures
.entry(self.public_key.user_id().to_owned())
.or_insert_with(BTreeMap::new)
.insert(
format!("ed25519:{}", self.inner.public_key().as_str()),
signature.0,
);
}
}
impl UserSigning {
pub async fn pickle(&self, pickle_key: &[u8]) -> PickledUserSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledUserSigning { pickle, public_key }
}
pub async fn sign_user(&self, _: &UserIdentity) -> BTreeMap<UserId, BTreeMap<String, Value>> {
todo!();
}
pub fn from_pickle(
pickle: PickledUserSigning,
pickle_key: &[u8],
) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
}
impl SelfSigning {
pub async fn pickle(&self, pickle_key: &[u8]) -> PickledSelfSigning {
let pickle = self.inner.pickle(pickle_key).await;
let public_key = self.public_key.clone().into();
PickledSelfSigning { pickle, public_key }
}
pub async fn sign_device_raw(&self, value: Value) -> Result<Signature, SignatureError> {
self.inner.sign_json(value).await
}
pub async fn sign_device(&self, device_keys: &mut DeviceKeys) -> Result<(), SignatureError> {
let json_device = serde_json::to_value(&device_keys)?;
let signature = self.sign_device_raw(json_device).await?;
device_keys
.signatures
.entry(self.public_key.user_id().to_owned())
.or_insert_with(BTreeMap::new)
.insert(
DeviceKeyId::from_parts(
DeviceKeyAlgorithm::Ed25519,
self.inner.public_key.as_str().into(),
),
signature.0,
);
Ok(())
}
pub fn from_pickle(
pickle: PickledSelfSigning,
pickle_key: &[u8],
) -> Result<Self, SigningError> {
let inner = Signing::from_pickle(pickle.pickle, pickle_key)?;
Ok(Self {
inner,
public_key: pickle.public_key.into(),
})
}
}
#[derive(Clone, PartialEq, Debug)]
pub struct SelfSigning {
pub inner: Signing,
pub public_key: SelfSigningPubkey,
}
#[derive(Clone, PartialEq, Debug)]
pub struct UserSigning {
pub inner: Signing,
pub public_key: UserSigningPubkey,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PickledSignings {
pub master_key: Option<PickledMasterSigning>,
pub user_signing_key: Option<PickledUserSigning>,
pub self_signing_key: Option<PickledSelfSigning>,
}
#[derive(Debug, Clone)]
pub struct Signature(String);
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PickledSigning(String);
impl Signing {
pub fn new() -> Self {
let seed = OlmPkSigning::generate_seed();
Self::from_seed(seed)
}
pub fn from_seed(seed: Vec<u8>) -> Self {
let inner = OlmPkSigning::new(seed.clone()).expect("Unable to create pk signing object");
let public_key = PublicSigningKey(Arc::new(inner.public_key().to_owned()));
Signing {
inner: Arc::new(Mutex::new(inner)),
seed: Arc::new(Zeroizing::from(seed)),
public_key,
}
}
pub fn from_pickle(pickle: PickledSigning, pickle_key: &[u8]) -> Result<Self, SigningError> {
let pickled: InnerPickle = serde_json::from_str(pickle.as_str())?;
let key = GenericArray::from_slice(pickle_key);
let cipher = Aes256Gcm::new(key);
let nonce = decode(pickled.nonce)?;
let nonce = GenericArray::from_slice(&nonce);
let ciphertext = &decode(pickled.ciphertext)?;
let seed = cipher
.decrypt(&nonce, ciphertext.as_slice())
.map_err(|e| SigningError::Decryption(e.to_string()))?;
Ok(Self::from_seed(seed))
}
pub async fn pickle(&self, pickle_key: &[u8]) -> PickledSigning {
let key = GenericArray::from_slice(pickle_key);
let cipher = Aes256Gcm::new(key);
let mut nonce = vec![0u8; NONCE_SIZE];
getrandom(&mut nonce).expect("Can't generate nonce to pickle the signing object");
let nonce = GenericArray::from_slice(nonce.as_slice());
let ciphertext = cipher
.encrypt(nonce, self.seed.as_slice())
.expect("Can't encrypt signing pickle");
let ciphertext = encode(ciphertext);
let pickle = InnerPickle {
version: 1,
nonce: encode(nonce.as_slice()),
ciphertext,
};
PickledSigning(serde_json::to_string(&pickle).expect("Can't encode pickled signing"))
}
pub fn public_key(&self) -> &PublicSigningKey {
&self.public_key
}
pub fn cross_signing_key(&self, user_id: UserId, usage: KeyUsage) -> CrossSigningKey {
let mut keys = BTreeMap::new();
keys.insert(
format!("ed25519:{}", self.public_key().as_str()),
self.public_key().to_string(),
);
CrossSigningKey {
user_id,
usage: vec![usage],
keys,
signatures: BTreeMap::new(),
}
}
pub async fn verify(
&self,
message: &str,
signature: &Signature,
) -> Result<bool, OlmUtilityError> {
let utility = OlmUtility::new();
utility.ed25519_verify(self.public_key.as_str(), message, signature.as_str())
}
pub async fn sign_json(&self, mut json: Value) -> Result<Signature, SignatureError> {
let json_object = json.as_object_mut().ok_or(SignatureError::NotAnObject)?;
let _ = json_object.remove("signatures");
let canonical_json = cjson::to_string(json_object)?;
Ok(self.sign(&canonical_json).await)
}
pub async fn sign(&self, message: &str) -> Signature {
Signature(self.inner.lock().await.sign(message))
}
}

1
matrix_sdk_crypto/src/verification/sas/mod.rs
View File

@ -190,6 +190,7 @@ impl Sas {
};
let cancel = if done {
// Pass on the signature upload request here as well.
self.mark_as_done().await?
} else {
None