crypto: Save the olm message hash.
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parent
ae2391791d
commit
270350cd34
6 changed files with 141 additions and 11 deletions
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@ -834,6 +834,7 @@ impl OlmMachine {
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};
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changes.sessions.push(decrypted.session);
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changes.message_hashes.push(decrypted.message_hash);
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if let Some(group_session) = decrypted.inbound_group_session {
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changes.inbound_group_sessions.push(group_session);
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@ -72,15 +72,27 @@ pub struct Account {
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pub(crate) store: Store,
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}
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#[derive(Debug, Clone)]
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pub struct OlmDecryptionInfo {
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pub session: Session,
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pub message_hash: String,
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pub message_hash: OlmMessageHash,
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pub event: Raw<AnyToDeviceEvent>,
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pub signing_key: String,
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pub sender_key: String,
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pub inbound_group_session: Option<InboundGroupSession>,
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}
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/// A hash of a succesfully decrypted Olm message.
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///
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/// Can be used to check if a message has been replayed to us.
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#[derive(Debug, Clone)]
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pub struct OlmMessageHash {
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/// The curve25519 key of the sender that sent us the Olm message.
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pub sender_key: String,
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/// The hash of the message.
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pub hash: String,
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}
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impl Deref for Account {
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type Target = ReadOnlyAccount;
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@ -119,7 +131,7 @@ impl Account {
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.chain(&[message_type])
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.chain(&ciphertext.body);
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let message_hash = encode(sha.finalize().as_slice());
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let hash = encode(sha.finalize().as_slice());
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// Create a OlmMessage from the ciphertext and the type.
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let message =
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@ -135,7 +147,10 @@ impl Account {
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Ok(OlmDecryptionInfo {
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session,
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message_hash,
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message_hash: OlmMessageHash {
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hash,
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sender_key: content.sender_key.clone(),
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},
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event,
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signing_key,
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sender_key: content.sender_key.clone(),
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@ -24,7 +24,7 @@ mod signing;
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mod utility;
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pub(crate) use account::{Account, OlmDecryptionInfo};
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pub use account::{AccountPickle, PickledAccount, ReadOnlyAccount};
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pub use account::{AccountPickle, OlmMessageHash, PickledAccount, ReadOnlyAccount};
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pub use group_sessions::{
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EncryptionSettings, ExportedRoomKey, InboundGroupSession, InboundGroupSessionPickle,
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PickledInboundGroupSession,
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@ -40,6 +40,7 @@ pub struct MemoryStore {
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inbound_group_sessions: GroupSessionStore,
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tracked_users: Arc<DashSet<UserId>>,
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users_for_key_query: Arc<DashSet<UserId>>,
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olm_hashes: Arc<DashMap<String, DashSet<String>>>,
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devices: DeviceStore,
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identities: Arc<DashMap<UserId, UserIdentities>>,
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values: Arc<DashMap<String, String>>,
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@ -52,6 +53,7 @@ impl Default for MemoryStore {
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inbound_group_sessions: GroupSessionStore::new(),
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tracked_users: Arc::new(DashSet::new()),
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users_for_key_query: Arc::new(DashSet::new()),
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olm_hashes: Arc::new(DashMap::new()),
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devices: DeviceStore::new(),
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identities: Arc::new(DashMap::new()),
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values: Arc::new(DashMap::new()),
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@ -120,6 +122,13 @@ impl CryptoStore for MemoryStore {
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.insert(identity.user_id().to_owned(), identity.clone());
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}
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for hash in changes.message_hashes {
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self.olm_hashes
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.entry(hash.sender_key.to_owned())
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.or_insert_with(DashSet::new)
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.insert(hash.hash.clone());
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}
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Ok(())
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}
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@ -218,14 +227,22 @@ impl CryptoStore for MemoryStore {
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async fn load_identity(&self) -> Result<Option<PrivateCrossSigningIdentity>> {
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Ok(None)
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}
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async fn is_message_known(&self, message_hash: &crate::olm::OlmMessageHash) -> Result<bool> {
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Ok(self
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.olm_hashes
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.entry(message_hash.sender_key.to_owned())
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.or_insert_with(DashSet::new)
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.contains(&message_hash.hash))
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}
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}
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#[cfg(test)]
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mod test {
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use crate::{
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identities::device::test::get_device,
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olm::{test::get_account_and_session, InboundGroupSession},
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store::{memorystore::MemoryStore, CryptoStore},
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olm::{test::get_account_and_session, InboundGroupSession, OlmMessageHash},
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store::{memorystore::MemoryStore, Changes, CryptoStore},
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};
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use matrix_sdk_common::identifiers::room_id;
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@ -329,4 +346,21 @@ mod test {
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assert!(store.is_user_tracked(device.user_id()));
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}
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#[tokio::test]
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async fn test_message_hash() {
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let store = MemoryStore::new();
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let hash = OlmMessageHash {
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sender_key: "test_sender".to_owned(),
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hash: "test_hash".to_owned(),
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};
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let mut changes = Changes::default();
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changes.message_hashes.push(hash.clone());
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assert!(!store.is_message_known(&hash).await.unwrap());
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store.save_changes(changes).await.unwrap();
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assert!(store.is_message_known(&hash).await.unwrap());
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}
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}
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@ -82,7 +82,9 @@ use matrix_sdk_common_macros::send_sync;
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use crate::{
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error::SessionUnpicklingError,
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identities::{Device, ReadOnlyDevice, UserDevices, UserIdentities},
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olm::{InboundGroupSession, PrivateCrossSigningIdentity, ReadOnlyAccount, Session},
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olm::{
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InboundGroupSession, OlmMessageHash, PrivateCrossSigningIdentity, ReadOnlyAccount, Session,
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},
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verification::VerificationMachine,
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};
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@ -108,6 +110,7 @@ pub(crate) struct Store {
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pub struct Changes {
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pub account: Option<ReadOnlyAccount>,
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pub sessions: Vec<Session>,
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pub message_hashes: Vec<OlmMessageHash>,
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pub inbound_group_sessions: Vec<InboundGroupSession>,
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pub identities: IdentityChanges,
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pub devices: DeviceChanges,
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@ -444,4 +447,7 @@ pub trait CryptoStore: Debug {
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/// Load a serializeable object from the store.
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async fn get_value(&self, key: &str) -> Result<Option<String>>;
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/// Check if a hash for an Olm message stored in the database.
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async fn is_message_known(&self, message_hash: &OlmMessageHash) -> Result<bool>;
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}
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@ -42,8 +42,9 @@ use crate::{
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identities::{LocalTrust, OwnUserIdentity, ReadOnlyDevice, UserIdentities, UserIdentity},
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olm::{
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AccountPickle, IdentityKeys, InboundGroupSession, InboundGroupSessionPickle,
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PickledAccount, PickledCrossSigningIdentity, PickledInboundGroupSession, PickledSession,
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PicklingMode, PrivateCrossSigningIdentity, ReadOnlyAccount, Session, SessionPickle,
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OlmMessageHash, PickledAccount, PickledCrossSigningIdentity, PickledInboundGroupSession,
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PickledSession, PicklingMode, PrivateCrossSigningIdentity, ReadOnlyAccount, Session,
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SessionPickle,
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},
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};
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@ -491,6 +492,24 @@ impl SqliteStore {
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)
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.await?;
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connection
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.execute(
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r#"
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CREATE TABLE IF NOT EXISTS olm_hashes (
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"id" INTEGER NOT NULL PRIMARY KEY,
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"account_id" INTEGER NOT NULL,
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"sender_key" TEXT NOT NULL,
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"hash" TEXT NOT NULL,
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FOREIGN KEY ("account_id") REFERENCES "accounts" ("id")
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ON DELETE CASCADE
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UNIQUE(account_id,sender_key,hash)
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);
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CREATE INDEX IF NOT EXISTS "olm_hashes_index" ON "olm_hashes" ("account_id");
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"#,
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)
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.await?;
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Ok(())
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}
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@ -1466,6 +1485,25 @@ impl SqliteStore {
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Ok(())
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}
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async fn save_olm_hashses(
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&self,
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connection: &mut SqliteConnection,
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hashes: &[OlmMessageHash],
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) -> Result<()> {
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let account_id = self.account_id().ok_or(CryptoStoreError::AccountUnset)?;
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for hash in hashes {
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query("REPLACE INTO olm_hashes (account_id, sender_key, hash) VALUES (?1, ?2, ?3)")
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.bind(account_id)
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.bind(&hash.sender_key)
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.bind(&hash.hash)
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.execute(&mut *connection)
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.await?;
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}
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Ok(())
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}
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async fn save_user_helper(
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&self,
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mut connection: &mut SqliteConnection,
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@ -1681,6 +1719,9 @@ impl CryptoStore for SqliteStore {
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self.save_user_identities(&mut transaction, &changes.identities.changed)
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.await?;
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self.save_olm_hashses(&mut transaction, &changes.message_hashes)
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.await?;
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transaction.commit().await?;
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Ok(())
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@ -1796,6 +1837,22 @@ impl CryptoStore for SqliteStore {
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Ok(row.map(|r| r.0))
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}
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async fn is_message_known(&self, message_hash: &OlmMessageHash) -> Result<bool> {
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let account_id = self.account_id().ok_or(CryptoStoreError::AccountUnset)?;
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let mut connection = self.connection.lock().await;
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let row: Option<(String,)> = query_as(
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"SELECT hash FROM olm_hashes WHERE account_id = ? and sender_key = ? and hash = ?",
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)
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.bind(account_id)
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.bind(&message_hash.sender_key)
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.bind(&message_hash.hash)
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.fetch_optional(&mut *connection)
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.await?;
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Ok(row.is_some())
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}
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}
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#[cfg(not(tarpaulin_include))]
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@ -1817,8 +1874,8 @@ mod test {
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user::test::{get_other_identity, get_own_identity},
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},
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olm::{
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GroupSessionKey, InboundGroupSession, PrivateCrossSigningIdentity, ReadOnlyAccount,
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Session,
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GroupSessionKey, InboundGroupSession, OlmMessageHash, PrivateCrossSigningIdentity,
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ReadOnlyAccount, Session,
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},
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store::{Changes, DeviceChanges, IdentityChanges},
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};
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@ -2371,4 +2428,21 @@ mod test {
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store.remove_value(&key).await.unwrap();
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assert!(store.get_value(&key).await.unwrap().is_none());
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}
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#[tokio::test(threaded_scheduler)]
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async fn olm_hash_saving() {
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let (_, store, _dir) = get_loaded_store().await;
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let hash = OlmMessageHash {
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sender_key: "test_sender".to_owned(),
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hash: "test_hash".to_owned(),
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};
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let mut changes = Changes::default();
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changes.message_hashes.push(hash.clone());
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assert!(!store.is_message_known(&hash).await.unwrap());
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store.save_changes(changes).await.unwrap();
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assert!(store.is_message_known(&hash).await.unwrap());
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}
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}
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