core_crypto/mls/external_commit.rs
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// Wire
// Copyright (C) 2022 Wire Swiss GmbH
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see http://www.gnu.org/licenses/.
use openmls::prelude::{group_info::VerifiableGroupInfo, MlsGroup, MlsMessageOut};
use openmls_traits::OpenMlsCryptoProvider;
use tls_codec::Serialize;
use core_crypto_keystore::{
connection::FetchFromDatabase,
entities::{MlsPendingMessage, PersistedMlsPendingGroup},
CryptoKeystoreMls,
};
use crate::{
e2e_identity::init_certificates::NewCrlDistributionPoint,
mls::credential::crl::{extract_crl_uris_from_group, get_new_crl_distribution_points},
prelude::{
decrypt::MlsBufferedConversationDecryptMessage, ConversationId, CryptoError, CryptoResult, MlsCiphersuite,
MlsConversation, MlsConversationConfiguration, MlsCredentialType, MlsCustomConfiguration, MlsError,
MlsGroupInfoBundle,
},
};
use crate::context::CentralContext;
/// Returned when a commit is created
#[derive(Debug)]
pub struct MlsConversationInitBundle {
/// Identifier of the conversation joined by external commit
pub conversation_id: ConversationId,
/// The external commit message
pub commit: MlsMessageOut,
/// `GroupInfo` which becomes valid when the external commit is accepted by the Delivery Service
pub group_info: MlsGroupInfoBundle,
/// New CRL distribution points that appeared by the introduction of a new credential
pub crl_new_distribution_points: NewCrlDistributionPoint,
}
impl MlsConversationInitBundle {
/// Serializes both wrapped objects into TLS and return them as a tuple of byte arrays.
/// 0 -> external commit
/// 1 -> public group state
#[allow(clippy::type_complexity)]
pub fn to_bytes(self) -> CryptoResult<(Vec<u8>, MlsGroupInfoBundle, NewCrlDistributionPoint)> {
let commit = self.commit.tls_serialize_detached().map_err(MlsError::from)?;
Ok((commit, self.group_info, self.crl_new_distribution_points))
}
}
impl CentralContext {
/// Issues an external commit and stores the group in a temporary table. This method is
/// intended for example when a new client wants to join the user's existing groups.
/// On success this function will return the group id and a message to be fanned out to other
/// clients.
///
/// If the Delivery Service accepts the external commit, you have to [CentralContext::merge_pending_group_from_external_commit]
/// in order to get back a functional MLS group. On the opposite, if it rejects it, you can either
/// retry by just calling again [CentralContext::join_by_external_commit], no need to [CentralContext::clear_pending_group_from_external_commit].
/// If you want to abort the operation (too many retries or the user decided to abort), you can use
/// [CentralContext::clear_pending_group_from_external_commit] in order not to bloat the user's storage but nothing
/// bad can happen if you forget to except some storage space wasted.
///
/// # Arguments
/// * `group_info` - a GroupInfo wrapped in a MLS message. it can be obtained by deserializing a TLS serialized `GroupInfo` object
/// * `custom_cfg` - configuration of the MLS conversation fetched from the Delivery Service
/// * `credential_type` - kind of [openmls::prelude::Credential] to use for joining this group.
/// If [MlsCredentialType::Basic] is chosen and no Credential has been created yet for it,
/// a new one will be generated. When [MlsCredentialType::X509] is chosen, it fails when no
/// [openmls::prelude::Credential] has been created for the given Ciphersuite.
///
/// # Return type
/// It will return a tuple with the group/conversation id and the message containing the
/// commit that was generated by this call
///
/// # Errors
/// Errors resulting from OpenMls, the KeyStore calls and serialization
pub async fn join_by_external_commit(
&self,
group_info: VerifiableGroupInfo,
custom_cfg: MlsCustomConfiguration,
credential_type: MlsCredentialType,
) -> CryptoResult<MlsConversationInitBundle> {
let client = &self.mls_client().await?;
let cs: MlsCiphersuite = group_info.ciphersuite().into();
let mls_provider = self.mls_provider().await?;
let cb = client
.get_most_recent_or_create_credential_bundle(&mls_provider, cs.signature_algorithm(), credential_type)
.await?;
let serialized_cfg = serde_json::to_vec(&custom_cfg).map_err(MlsError::MlsKeystoreSerializationError)?;
let configuration = MlsConversationConfiguration {
ciphersuite: cs,
custom: custom_cfg,
..Default::default()
};
let (group, commit, group_info) = MlsGroup::join_by_external_commit(
&mls_provider,
&cb.signature_key,
None,
group_info,
&configuration.as_openmls_default_configuration()?,
&[],
cb.to_mls_credential_with_key(),
)
.await
.map_err(MlsError::from)?;
// We should always have ratchet tree extension turned on hence GroupInfo should always be present
let group_info = group_info.ok_or(CryptoError::ImplementationError)?;
let group_info = MlsGroupInfoBundle::try_new_full_plaintext(group_info)?;
let crl_new_distribution_points =
get_new_crl_distribution_points(&mls_provider, extract_crl_uris_from_group(&group)?).await?;
mls_provider
.key_store()
.mls_pending_groups_save(
group.group_id().as_slice(),
&core_crypto_keystore::ser(&group)?,
&serialized_cfg,
None,
)
.await?;
Ok(MlsConversationInitBundle {
conversation_id: group.group_id().to_vec(),
commit,
group_info,
crl_new_distribution_points,
})
}
/// This merges the commit generated by [CentralContext::join_by_external_commit], persists the group permanently and
/// deletes the temporary one. After merging, the group should be fully functional.
///
/// # Arguments
/// * `id` - the conversation id
///
/// # Errors
/// Errors resulting from OpenMls, the KeyStore calls and deserialization
#[cfg_attr(test, crate::dispotent)]
pub async fn merge_pending_group_from_external_commit(
&self,
id: &ConversationId,
) -> CryptoResult<Option<Vec<MlsBufferedConversationDecryptMessage>>> {
// Retrieve the pending MLS group from the keystore
let mls_provider = self.mls_provider().await?;
let (group, cfg) = mls_provider.key_store().mls_pending_groups_load(id).await?;
let mut mls_group = core_crypto_keystore::deser::<MlsGroup>(&group)?;
// Merge it aka bring the MLS group to life and make it usable
mls_group
.merge_pending_commit(&mls_provider)
.await
.map_err(MlsError::from)?;
// Restore the custom configuration and build a conversation from it
let custom_cfg = serde_json::from_slice(&cfg).map_err(MlsError::MlsKeystoreSerializationError)?;
let configuration = MlsConversationConfiguration {
ciphersuite: mls_group.ciphersuite().into(),
custom: custom_cfg,
..Default::default()
};
let is_rejoin = mls_provider.key_store().mls_group_exists(id.as_slice()).await;
// Persist the now usable MLS group in the keystore
let mut conversation = MlsConversation::from_mls_group(mls_group, configuration, &mls_provider).await?;
let pending_messages = self.restore_pending_messages(&mut conversation, is_rejoin).await?;
self.mls_groups().await?.insert(id.clone(), conversation);
// cleanup the pending group we no longer need
mls_provider.key_store().mls_pending_groups_delete(id).await?;
if pending_messages.is_some() {
mls_provider.key_store().remove::<MlsPendingMessage, _>(id).await?;
}
Ok(pending_messages)
}
/// In case the external commit generated by [CentralContext::join_by_external_commit] is rejected by the Delivery Service
/// and we want to abort this external commit once for all, we can wipe out the pending group from
/// the keystore in order not to waste space
///
/// # Arguments
/// * `id` - the conversation id
///
/// # Errors
/// Errors resulting from the KeyStore calls
#[cfg_attr(test, crate::dispotent)]
pub async fn clear_pending_group_from_external_commit(&self, id: &ConversationId) -> CryptoResult<()> {
Ok(self.keystore().await?.mls_pending_groups_delete(id).await?)
}
pub(crate) async fn pending_group_exists(&self, id: &ConversationId) -> CryptoResult<bool> {
Ok(self
.keystore()
.await?
.find::<PersistedMlsPendingGroup>(id.as_slice())
.await
.ok()
.flatten()
.is_some())
}
}
#[cfg(test)]
mod tests {
use openmls::prelude::*;
use wasm_bindgen_test::*;
use core_crypto_keystore::{CryptoKeystoreError, CryptoKeystoreMls, MissingKeyErrorKind};
use crate::prelude::MlsConversationConfiguration;
use crate::{prelude::MlsConversationInitBundle, test_utils::*, CryptoError};
wasm_bindgen_test_configure!(run_in_browser);
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn join_by_external_commit_should_succeed(case: TestCase) {
run_test_with_client_ids(
case.clone(),
["alice", "bob"],
move |[alice_central, mut bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
// export Alice group info
let group_info = alice_central.get_group_info(&id).await;
// Bob tries to join Alice's group
let MlsConversationInitBundle {
conversation_id: group_id,
commit: external_commit,
..
} = bob_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await
.unwrap();
assert_eq!(group_id.as_slice(), &id);
// Alice acks the request and adds the new member
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 1);
let decrypted = alice_central
.context
.decrypt_message(&id, &external_commit.to_bytes().unwrap())
.await
.unwrap();
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 2);
// verify Bob's (sender) identity
bob_central.verify_sender_identity(&case, &decrypted).await;
// Let's say backend accepted our external commit.
// So Bob can merge the commit and update the local state
assert!(bob_central.context.get_conversation(&id).await.is_err());
bob_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
assert!(bob_central.context.get_conversation(&id).await.is_ok());
assert_eq!(bob_central.get_conversation_unchecked(&id).await.members().len(), 2);
assert!(alice_central.try_talk_to(&id, &bob_central).await.is_ok());
// Pending group removed from keystore
let error = alice_central
.context
.keystore()
.await
.unwrap()
.mls_pending_groups_load(&id)
.await;
assert!(matches!(
error.unwrap_err(),
CryptoKeystoreError::MissingKeyInStore(MissingKeyErrorKind::MlsPendingGroup)
));
// Ensure it's durable i.e. MLS group has been persisted
bob_central.context.drop_and_restore(&group_id).await;
assert!(bob_central.try_talk_to(&id, &alice_central).await.is_ok());
})
},
)
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn join_by_external_commit_should_be_retriable(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
// export Alice group info
let group_info = alice_central.get_group_info(&id).await;
// Bob tries to join Alice's group
bob_central
.context
.join_by_external_commit(group_info.clone(), case.custom_cfg(), case.credential_type)
.await
.unwrap();
// BUT for some reason the Delivery Service will reject this external commit
// e.g. another commit arrived meanwhile and the [GroupInfo] is no longer valid
// Retrying
let MlsConversationInitBundle {
conversation_id,
commit: external_commit,
..
} = bob_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await
.unwrap();
assert_eq!(conversation_id.as_slice(), &id);
// Alice decrypts the external commit and adds Bob
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 1);
alice_central
.context
.decrypt_message(&id, &external_commit.to_bytes().unwrap())
.await
.unwrap();
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 2);
// And Bob can merge its external commit
bob_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
assert!(bob_central.context.get_conversation(&id).await.is_ok());
assert_eq!(bob_central.get_conversation_unchecked(&id).await.members().len(), 2);
assert!(alice_central.try_talk_to(&id, &bob_central).await.is_ok());
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn should_fail_when_bad_epoch(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let group_info = alice_central.get_group_info(&id).await;
// try to make an external join into Alice's group
let MlsConversationInitBundle {
commit: external_commit,
..
} = bob_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await
.unwrap();
// Alice creates a new commit before receiving the external join
alice_central.context.update_keying_material(&id).await.unwrap();
alice_central.context.commit_accepted(&id).await.unwrap();
// receiving the external join with outdated epoch should fail because of
// the wrong epoch
let result = alice_central
.context
.decrypt_message(&id, &external_commit.to_bytes().unwrap())
.await;
assert!(matches!(result.unwrap_err(), crate::CryptoError::StaleCommit));
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn existing_clients_can_join(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
alice_central.invite_all(&case, &id, [&bob_central]).await.unwrap();
let group_info = alice_central.get_group_info(&id).await;
// Alice can rejoin by external commit
alice_central
.context
.join_by_external_commit(group_info.clone(), case.custom_cfg(), case.credential_type)
.await
.unwrap();
alice_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn should_fail_when_no_pending_external_commit(case: TestCase) {
run_test_with_central(case.clone(), move |[central]| {
Box::pin(async move {
let id = conversation_id();
// try to merge an inexisting pending group
let merge_unknown = central.context.merge_pending_group_from_external_commit(&id).await;
assert!(matches!(
merge_unknown.unwrap_err(),
crate::CryptoError::KeyStoreError(CryptoKeystoreError::MissingKeyInStore(
MissingKeyErrorKind::MlsPendingGroup
))
));
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn should_return_valid_group_info(case: TestCase) {
run_test_with_client_ids(
case.clone(),
["alice", "bob", "charlie"],
move |[alice_central, bob_central, charlie_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
// export Alice group info
let group_info = alice_central.get_group_info(&id).await;
// Bob tries to join Alice's group
let MlsConversationInitBundle {
commit: bob_external_commit,
group_info,
..
} = bob_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await
.unwrap();
// Alice decrypts the commit, Bob's in !
alice_central
.context
.decrypt_message(&id, &bob_external_commit.to_bytes().unwrap())
.await
.unwrap();
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 2);
// Bob merges the commit, he's also in !
bob_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
assert!(bob_central.context.get_conversation(&id).await.is_ok());
assert_eq!(bob_central.get_conversation_unchecked(&id).await.members().len(), 2);
assert!(alice_central.try_talk_to(&id, &bob_central).await.is_ok());
// Now charlie wants to join with the [GroupInfo] from Bob's external commit
let bob_gi = group_info.get_group_info();
let MlsConversationInitBundle {
commit: charlie_external_commit,
..
} = charlie_central
.context
.join_by_external_commit(bob_gi, case.custom_cfg(), case.credential_type)
.await
.unwrap();
// Both Alice & Bob decrypt the commit
alice_central
.context
.decrypt_message(&id, charlie_external_commit.to_bytes().unwrap())
.await
.unwrap();
bob_central
.context
.decrypt_message(&id, charlie_external_commit.to_bytes().unwrap())
.await
.unwrap();
assert_eq!(alice_central.get_conversation_unchecked(&id).await.members().len(), 3);
assert_eq!(bob_central.get_conversation_unchecked(&id).await.members().len(), 3);
// Charlie merges the commit, he's also in !
charlie_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
assert!(charlie_central.context.get_conversation(&id).await.is_ok());
assert_eq!(charlie_central.get_conversation_unchecked(&id).await.members().len(), 3);
assert!(charlie_central.try_talk_to(&id, &alice_central).await.is_ok());
assert!(charlie_central.try_talk_to(&id, &bob_central).await.is_ok());
})
},
)
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn clear_pending_group_should_succeed(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let initial_count = alice_central.context.count_entities().await;
// export Alice group info
let group_info = alice_central.get_group_info(&id).await;
// Bob tries to join Alice's group
bob_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await
.unwrap();
// But for some reason, Bob wants to abort joining the group
bob_central
.context
.clear_pending_group_from_external_commit(&id)
.await
.unwrap();
let final_count = alice_central.context.count_entities().await;
assert_eq!(initial_count, final_count);
// Hence trying to merge the pending should fail
let result = bob_central.context.merge_pending_group_from_external_commit(&id).await;
assert!(matches!(
result.unwrap_err(),
CryptoError::KeyStoreError(CryptoKeystoreError::MissingKeyInStore(
MissingKeyErrorKind::MlsPendingGroup
))
))
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn new_with_inflight_join_should_fail_when_already_exists(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let gi = alice_central.get_group_info(&id).await;
// Bob to join a conversation but while the server processes its request he
// creates a conversation with the id of the conversation he's trying to join
bob_central
.context
.join_by_external_commit(gi, case.custom_cfg(), case.credential_type)
.await
.unwrap();
// erroneous call
let conflict_join = bob_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await;
assert!(matches!(conflict_join.unwrap_err(), CryptoError::ConversationAlreadyExists(i) if i == id));
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn new_with_inflight_welcome_should_fail_when_already_exists(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let gi = alice_central.get_group_info(&id).await;
// While Bob tries to join a conversation via external commit he's also invited
// to a conversation with the same id through a Welcome message
bob_central
.context
.join_by_external_commit(gi, case.custom_cfg(), case.credential_type)
.await
.unwrap();
let bob = bob_central.rand_key_package(&case).await;
let welcome = alice_central
.context
.add_members_to_conversation(&id, vec![bob])
.await
.unwrap()
.welcome;
// erroneous call
let conflict_welcome = bob_central
.context
.process_welcome_message(welcome.into(), case.custom_cfg())
.await;
assert!(matches!(conflict_welcome.unwrap_err(), CryptoError::ConversationAlreadyExists(i) if i == id));
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn should_fail_when_invalid_group_info(case: TestCase) {
run_test_with_client_ids(
case.clone(),
["alice", "bob", "guest"],
move |[alice_central, bob_central, guest_central]| {
Box::pin(async move {
let expiration_time = 14;
let start = web_time::Instant::now();
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let invalid_kp = bob_central.new_keypackage(&case, Lifetime::new(expiration_time)).await;
alice_central
.context
.add_members_to_conversation(&id, vec![invalid_kp.into()])
.await
.unwrap();
alice_central.context.commit_accepted(&id).await.unwrap();
let elapsed = start.elapsed();
// Give time to the certificate to expire
let expiration_time = core::time::Duration::from_secs(expiration_time);
if expiration_time > elapsed {
async_std::task::sleep(expiration_time - elapsed + core::time::Duration::from_secs(1)).await;
}
let group_info = alice_central.get_group_info(&id).await;
let join_ext_commit = guest_central
.context
.join_by_external_commit(group_info, case.custom_cfg(), case.credential_type)
.await;
// TODO: currently succeeds as we don't anymore validate KeyPackage lifetime upon reception: find another way to craft an invalid KeyPackage. Tracking issue: WPB-9596
join_ext_commit.unwrap();
/*assert!(matches!(
join_ext_commit.unwrap_err(),
CryptoError::MlsError(MlsError::MlsExternalCommitError(ExternalCommitError::PublicGroupError(
CreationFromExternalError::TreeSyncError(TreeSyncFromNodesError::LeafNodeValidationError(
LeafNodeValidationError::Lifetime(LifetimeError::NotCurrent),
)),
)))
));*/
})
},
)
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn group_should_have_right_config(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice", "bob"], move |[alice_central, bob_central]| {
Box::pin(async move {
let id = conversation_id();
alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let gi = alice_central.get_group_info(&id).await;
bob_central
.context
.join_by_external_commit(gi, case.custom_cfg(), case.credential_type)
.await
.unwrap();
bob_central
.context
.merge_pending_group_from_external_commit(&id)
.await
.unwrap();
let group = bob_central.get_conversation_unchecked(&id).await;
let capabilities = group.group.group_context_extensions().required_capabilities().unwrap();
// see https://www.rfc-editor.org/rfc/rfc9420.html#section-11.1
assert!(capabilities.extension_types().is_empty());
assert!(capabilities.proposal_types().is_empty());
assert_eq!(
capabilities.credential_types(),
MlsConversationConfiguration::DEFAULT_SUPPORTED_CREDENTIALS
);
})
})
.await
}
}