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crypto: Return a higher level struct when decrypting olm messages instead of tuples

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This commit is contained in:
Damir Jelić 2020-12-01 12:41:11 +01:00
parent efe659910f
commit 24592adbba
6 changed files with 107 additions and 78 deletions
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4
matrix_sdk_crypto/src/file_encryption/mod.rs
View file

@ -14,10 +14,10 @@ fn decode_url_safe(input: impl AsRef<[u8]>) -> Result<Vec<u8>, DecodeError> {
decode_config(input, URL_SAFE_NO_PAD)
}
fn encode(input: impl AsRef<[u8]>) -> String {
pub fn encode(input: impl AsRef<[u8]>) -> String {
encode_config(input, STANDARD_NO_PAD)
}
fn encode_url_safe(input: impl AsRef<[u8]>) -> String {
pub fn encode_url_safe(input: impl AsRef<[u8]>) -> String {
encode_config(input, URL_SAFE_NO_PAD)
}

26
matrix_sdk_crypto/src/key_request.rs
View file

@ -1137,12 +1137,11 @@ mod test {
.unwrap()
.is_none());
let (_, decrypted, sender_key, _) =
alice_account.decrypt_to_device_event(&event).await.unwrap();
let decrypted = alice_account.decrypt_to_device_event(&event).await.unwrap();
if let AnyToDeviceEvent::ForwardedRoomKey(mut e) = decrypted.deserialize().unwrap() {
if let AnyToDeviceEvent::ForwardedRoomKey(mut e) = decrypted.event.deserialize().unwrap() {
let (_, session) = alice_machine
.receive_forwarded_room_key(&sender_key, &mut e)
.receive_forwarded_room_key(&decrypted.sender_key, &mut e)
.await
.unwrap();
alice_machine
@ -1157,7 +1156,11 @@ mod test {
// Check that alice now does have the session.
let session = alice_machine
.store
.get_inbound_group_session(&room_id(), &sender_key, group_session.session_id())
.get_inbound_group_session(
&room_id(),
&decrypted.sender_key,
group_session.session_id(),
)
.await
.unwrap()
.unwrap();
@ -1325,12 +1328,11 @@ mod test {
.unwrap()
.is_none());
let (_, decrypted, sender_key, _) =
alice_account.decrypt_to_device_event(&event).await.unwrap();
let decrypted = alice_account.decrypt_to_device_event(&event).await.unwrap();
if let AnyToDeviceEvent::ForwardedRoomKey(mut e) = decrypted.deserialize().unwrap() {
if let AnyToDeviceEvent::ForwardedRoomKey(mut e) = decrypted.event.deserialize().unwrap() {
let (_, session) = alice_machine
.receive_forwarded_room_key(&sender_key, &mut e)
.receive_forwarded_room_key(&decrypted.sender_key, &mut e)
.await
.unwrap();
alice_machine
@ -1345,7 +1347,11 @@ mod test {
// Check that alice now does have the session.
let session = alice_machine
.store
.get_inbound_group_session(&room_id(), &sender_key, group_session.session_id())
.get_inbound_group_session(
&room_id(),
&decrypted.sender_key,
group_session.session_id(),
)
.await
.unwrap()
.unwrap();

114
matrix_sdk_crypto/src/machine.rs
View file

@ -52,7 +52,7 @@ use crate::{
key_request::KeyRequestMachine,
olm::{
Account, EncryptionSettings, ExportedRoomKey, GroupSessionKey, IdentityKeys,
InboundGroupSession, PrivateCrossSigningIdentity, ReadOnlyAccount, Session,
InboundGroupSession, OlmDecryptionInfo, PrivateCrossSigningIdentity, ReadOnlyAccount,
},
requests::{IncomingResponse, OutgoingRequest, UploadSigningKeysRequest},
session_manager::{GroupSessionManager, SessionManager},
@ -555,24 +555,23 @@ impl OlmMachine {
async fn decrypt_to_device_event(
&self,
event: &ToDeviceEvent<EncryptedEventContent>,
) -> OlmResult<(Session, Raw<AnyToDeviceEvent>, Option<InboundGroupSession>)> {
let (session, decrypted_event, sender_key, signing_key) =
self.account.decrypt_to_device_event(event).await?;
) -> OlmResult<OlmDecryptionInfo> {
let mut decrypted = self.account.decrypt_to_device_event(event).await?;
// Handle the decrypted event, e.g. fetch out Megolm sessions out of
// the event.
if let (Some(event), group_session) = self
.handle_decrypted_to_device_event(&sender_key, &signing_key, &decrypted_event)
.await?
if let (Some(event), group_session) =
self.handle_decrypted_to_device_event(&decrypted).await?
{
// Some events may have sensitive data e.g. private keys, while we
// want to notify our users that a private key was received we
// don't want them to be able to do silly things with it. Handling
// events modifies them and returns a modified one, so replace it
// here if we get one.
Ok((session, event, group_session))
} else {
Ok((session, decrypted_event, None))
decrypted.event = event;
decrypted.inbound_group_session = group_session;
}
Ok(decrypted)
}
/// Create a group session from a room key and add it to our crypto store.
@ -704,27 +703,29 @@ impl OlmMachine {
/// * `event` - The decrypted to-device event.
async fn handle_decrypted_to_device_event(
&self,
sender_key: &str,
signing_key: &str,
event: &Raw<AnyToDeviceEvent>,
decrypted: &OlmDecryptionInfo,
) -> OlmResult<(Option<Raw<AnyToDeviceEvent>>, Option<InboundGroupSession>)> {
let event = if let Ok(e) = event.deserialize() {
e
} else {
warn!("Decrypted to-device event failed to be parsed correctly");
return Ok((None, None));
let event = match decrypted.event.deserialize() {
Ok(e) => e,
Err(e) => {
warn!(
"Decrypted to-device event failed to be parsed correctly {:?}",
e
);
return Ok((None, None));
}
};
match event {
AnyToDeviceEvent::RoomKey(mut e) => {
Ok(self.add_room_key(sender_key, signing_key, &mut e).await?)
}
AnyToDeviceEvent::RoomKey(mut e) => Ok(self
.add_room_key(&decrypted.sender_key, &decrypted.signing_key, &mut e)
.await?),
AnyToDeviceEvent::ForwardedRoomKey(mut e) => Ok(self
.key_request_machine
.receive_forwarded_room_key(sender_key, &mut e)
.receive_forwarded_room_key(&decrypted.sender_key, &mut e)
.await?),
_ => {
warn!("Received a unexpected encrypted to-device event");
warn!("Received an unexpected encrypted to-device event");
Ok((None, None))
}
}
@ -808,38 +809,37 @@ impl OlmMachine {
match &mut event {
AnyToDeviceEvent::RoomEncrypted(e) => {
let (session, decrypted_event, group_session) =
match self.decrypt_to_device_event(e).await {
Ok(e) => e,
Err(err) => {
warn!(
"Failed to decrypt to-device event from {} {}",
e.sender, err
);
let decrypted = match self.decrypt_to_device_event(e).await {
Ok(e) => e,
Err(err) => {
warn!(
"Failed to decrypt to-device event from {} {}",
e.sender, err
);
if let OlmError::SessionWedged(sender, curve_key) = err {
if let Err(e) = self
.session_manager
.mark_device_as_wedged(&sender, &curve_key)
.await
{
error!(
"Couldn't mark device from {} to be unwedged {:?}",
sender, e
);
}
if let OlmError::SessionWedged(sender, curve_key) = err {
if let Err(e) = self
.session_manager
.mark_device_as_wedged(&sender, &curve_key)
.await
{
error!(
"Couldn't mark device from {} to be unwedged {:?}",
sender, e
);
}
continue;
}
};
continue;
}
};
changes.sessions.push(session);
changes.sessions.push(decrypted.session);
if let Some(group_session) = group_session {
if let Some(group_session) = decrypted.inbound_group_session {
changes.inbound_group_sessions.push(group_session);
}
*event_result = decrypted_event;
*event_result = decrypted.event;
}
AnyToDeviceEvent::RoomKeyRequest(e) => {
self.key_request_machine.receive_incoming_key_request(e)
@ -1283,8 +1283,8 @@ pub(crate) mod test {
content,
};
let (session, _, _) = bob.decrypt_to_device_event(&event).await.unwrap();
bob.store.save_sessions(&[session]).await.unwrap();
let decrypted = bob.decrypt_to_device_event(&event).await.unwrap();
bob.store.save_sessions(&[decrypted.session]).await.unwrap();
(alice, bob)
}
@ -1578,7 +1578,7 @@ pub(crate) mod test {
.decrypt_to_device_event(&event)
.await
.unwrap()
.1
.event
.deserialize()
.unwrap();
@ -1614,14 +1614,14 @@ pub(crate) mod test {
.get_outbound_group_session(&room_id)
.unwrap();
let (session, event, group_session) = bob.decrypt_to_device_event(&event).await.unwrap();
let decrypted = bob.decrypt_to_device_event(&event).await.unwrap();
bob.store.save_sessions(&[session]).await.unwrap();
bob.store.save_sessions(&[decrypted.session]).await.unwrap();
bob.store
.save_inbound_group_sessions(&[group_session.unwrap()])
.save_inbound_group_sessions(&[decrypted.inbound_group_session.unwrap()])
.await
.unwrap();
let event = event.deserialize().unwrap();
let event = decrypted.event.deserialize().unwrap();
if let AnyToDeviceEvent::RoomKey(event) = event {
assert_eq!(&event.sender, alice.user_id());
@ -1661,7 +1661,11 @@ pub(crate) mod test {
content: to_device_requests_to_content(to_device_requests),
};
let (_, _, group_session) = bob.decrypt_to_device_event(&event).await.unwrap();
let group_session = bob
.decrypt_to_device_event(&event)
.await
.unwrap()
.inbound_group_session;
bob.store
.save_inbound_group_sessions(&[group_session.unwrap()])
.await

35
matrix_sdk_crypto/src/olm/account.rs
View file

@ -15,6 +15,7 @@
use matrix_sdk_common::events::ToDeviceEvent;
use serde::{Deserialize, Serialize};
use serde_json::{json, Value};
use sha2::{Digest, Sha256};
use std::{
collections::BTreeMap,
convert::{TryFrom, TryInto},
@ -53,6 +54,7 @@ use olm_rs::{
use crate::{
error::{EventError, OlmResult, SessionCreationError},
file_encryption::encode,
identities::ReadOnlyDevice,
requests::UploadSigningKeysRequest,
store::Store,
@ -70,6 +72,15 @@ pub struct Account {
pub(crate) store: Store,
}
pub struct OlmDecryptionInfo {
pub session: Session,
pub message_hash: String,
pub event: Raw<AnyToDeviceEvent>,
pub signing_key: String,
pub sender_key: String,
pub inbound_group_session: Option<InboundGroupSession>,
}
impl Deref for Account {
type Target = ReadOnlyAccount;
@ -82,7 +93,7 @@ impl Account {
pub async fn decrypt_to_device_event(
&self,
event: &ToDeviceEvent<EncryptedEventContent>,
) -> OlmResult<(Session, Raw<AnyToDeviceEvent>, String, String)> {
) -> OlmResult<OlmDecryptionInfo> {
debug!("Decrypting to-device event");
let content = if let EncryptedEventContent::OlmV1Curve25519AesSha2(c) = &event.content {
@ -103,23 +114,33 @@ impl Account {
.try_into()
.map_err(|_| EventError::UnsupportedOlmType)?;
let sha = Sha256::new()
.chain(&content.sender_key)
.chain(&[message_type])
.chain(&ciphertext.body);
let message_hash = encode(sha.finalize().as_slice());
// Create a OlmMessage from the ciphertext and the type.
let message =
OlmMessage::from_type_and_ciphertext(message_type.into(), ciphertext.body.clone())
.map_err(|_| EventError::UnsupportedOlmType)?;
// Decrypt the OlmMessage and get a Ruma event out of it.
let (session, decrypted_event, signing_key) = self
let (session, event, signing_key) = self
.decrypt_olm_message(&event.sender, &content.sender_key, message)
.await?;
debug!("Decrypted a to-device event {:?}", decrypted_event);
Ok((
debug!("Decrypted a to-device event {:?}", event);
Ok(OlmDecryptionInfo {
session,
decrypted_event,
content.sender_key.clone(),
message_hash,
event,
signing_key,
))
sender_key: content.sender_key.clone(),
inbound_group_session: None,
})
} else {
warn!("Olm event doesn't contain a ciphertext for our key");
Err(EventError::MissingCiphertext.into())

2
matrix_sdk_crypto/src/olm/mod.rs
View file

@ -23,7 +23,7 @@ mod session;
mod signing;
mod utility;
pub(crate) use account::Account;
pub(crate) use account::{Account, OlmDecryptionInfo};
pub use account::{AccountPickle, PickledAccount, ReadOnlyAccount};
pub use group_sessions::{
EncryptionSettings, ExportedRoomKey, InboundGroupSession, InboundGroupSessionPickle,

4
matrix_sdk_crypto/src/olm/session.rs
View file

@ -126,9 +126,7 @@ impl Session {
"content": content,
});
let plaintext = serde_json::to_string(&payload)
.unwrap_or_else(|_| panic!(format!("Can't serialize {} to canonical JSON", payload)));
let plaintext = serde_json::to_string(&payload)?;
let ciphertext = self.encrypt_helper(&plaintext).await.to_tuple();
let message_type = ciphertext.0;