core_crypto/mls/mod.rs
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use std::sync::Arc;
use async_lock::RwLock;
use log::trace;
use crate::prelude::{
identifier::ClientIdentifier, key_package::INITIAL_KEYING_MATERIAL_COUNT, Client, ClientId, ConversationId,
CryptoError, CryptoResult, MlsCentralConfiguration, MlsCiphersuite, MlsConversation, MlsConversationConfiguration,
MlsCredentialType, MlsError, MlsTransport,
};
use crate::CoreCrypto;
use mls_crypto_provider::{EntropySeed, MlsCryptoProvider, MlsCryptoProviderConfiguration};
use openmls_traits::OpenMlsCryptoProvider;
use crate::context::CentralContext;
pub(crate) mod buffer_external_commit;
pub(crate) mod ciphersuite;
pub(crate) mod client;
pub mod conversation;
pub(crate) mod credential;
pub(crate) mod external_commit;
pub(crate) mod external_proposal;
pub(crate) mod proposal;
// Prevents direct instantiation of [MlsCentralConfiguration]
pub(crate) mod config {
use mls_crypto_provider::EntropySeed;
use super::*;
/// Configuration parameters for `MlsCentral`
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct MlsCentralConfiguration {
/// Location where the SQLite/IndexedDB database will be stored
pub store_path: String,
/// Identity key to be used to instantiate the [MlsCryptoProvider]
pub identity_key: String,
/// Identifier for the client to be used by [MlsCentral]
pub client_id: Option<ClientId>,
/// Entropy pool seed for the internal PRNG
pub external_entropy: Option<EntropySeed>,
/// All supported ciphersuites
pub ciphersuites: Vec<ciphersuite::MlsCiphersuite>,
/// Number of [openmls::prelude::KeyPackage] to create when creating a MLS client. Default to [INITIAL_KEYING_MATERIAL_COUNT]
pub nb_init_key_packages: Option<usize>,
}
impl MlsCentralConfiguration {
/// Creates a new instance of the configuration.
///
/// # Arguments
/// * `store_path` - location where the SQLite/IndexedDB database will be stored
/// * `identity_key` - identity key to be used to instantiate the [MlsCryptoProvider]
/// * `client_id` - identifier for the client to be used by [MlsCentral]
/// * `ciphersuites` - Ciphersuites supported by this device
/// * `entropy` - External source of entropy for platforms where default source insufficient
///
/// # Errors
/// Any empty string parameter will result in a [CryptoError::MalformedIdentifier] error.
///
/// # Examples
///
/// This should fail:
/// ```
/// use core_crypto::{prelude::MlsCentralConfiguration, CryptoError};
///
/// let result = MlsCentralConfiguration::try_new(String::new(), String::new(), Some(b"".to_vec().into()), vec![], None, Some(100));
/// assert!(matches!(result.unwrap_err(), CryptoError::MalformedIdentifier(_)));
/// ```
///
/// This should work:
/// ```
/// use core_crypto::prelude::{MlsCentralConfiguration, CryptoError, MlsCiphersuite};
///
/// let result = MlsCentralConfiguration::try_new(
/// "/tmp/crypto".to_string(),
/// "MY_IDENTITY_KEY".to_string(),
/// Some(b"MY_CLIENT_ID".to_vec().into()),
/// vec![MlsCiphersuite::default()],
/// None,
/// Some(100),
/// );
/// assert!(result.is_ok());
/// ```
pub fn try_new(
store_path: String,
identity_key: String,
client_id: Option<ClientId>,
ciphersuites: Vec<MlsCiphersuite>,
entropy: Option<Vec<u8>>,
nb_init_key_packages: Option<usize>,
) -> CryptoResult<Self> {
// TODO: probably more complex rules to enforce. Tracking issue: WPB-9598
if store_path.trim().is_empty() {
return Err(CryptoError::MalformedIdentifier("store_path"));
}
// TODO: probably more complex rules to enforce. Tracking issue: WPB-9598
if identity_key.trim().is_empty() {
return Err(CryptoError::MalformedIdentifier("identity_key"));
}
// TODO: probably more complex rules to enforce. Tracking issue: WPB-9598
if let Some(client_id) = client_id.as_ref() {
if client_id.is_empty() {
return Err(CryptoError::MalformedIdentifier("client_id"));
}
}
let external_entropy = entropy
.as_deref()
.map(|seed| &seed[..EntropySeed::EXPECTED_LEN])
.map(EntropySeed::try_from_slice)
.transpose()?;
Ok(Self {
store_path,
identity_key,
client_id,
ciphersuites,
external_entropy,
nb_init_key_packages,
})
}
/// Sets the entropy seed
pub fn set_entropy(&mut self, entropy: EntropySeed) {
self.external_entropy = Some(entropy);
}
#[cfg(test)]
#[allow(dead_code)]
/// Creates temporary file to prevent test collisions which would happen with hardcoded file path
/// Intended to be used only in tests.
pub(crate) fn tmp_store_path(tmp_dir: &tempfile::TempDir) -> String {
let path = tmp_dir.path().join("store.edb");
std::fs::File::create(&path).unwrap();
path.to_str().unwrap().to_string()
}
}
}
/// The entry point for the MLS CoreCrypto library. This struct provides all functionality to create
/// and manage groups, make proposals and commits.
#[derive(Debug, Clone)]
pub struct MlsCentral {
pub(crate) mls_client: Client,
pub(crate) mls_backend: MlsCryptoProvider,
// this should be moved to the context
pub(crate) transport: Arc<RwLock<Option<Arc<dyn MlsTransport + 'static>>>>,
}
impl MlsCentral {
/// Tries to initialize the MLS Central object.
/// Takes a store path (i.e. Disk location of the embedded database, should be consistent between messaging sessions)
/// And a root identity key (i.e. enclaved encryption key for this device)
///
/// # Arguments
/// * `configuration` - the configuration for the `MlsCentral`
///
/// # Errors
/// Failures in the initialization of the KeyStore can cause errors, such as IO, the same kind
/// of errors can happen when the groups are being restored from the KeyStore or even during
/// the client initialization (to fetch the identity signature). Other than that, `MlsError`
/// can be caused by group deserialization or during the initialization of the credentials:
/// * for x509 Credentials if the cetificate chain length is lower than 2
/// * for Basic Credentials if the signature key cannot be generated either by not supported
/// scheme or the key generation fails
pub async fn try_new(configuration: MlsCentralConfiguration) -> CryptoResult<Self> {
// Init backend (crypto + rand + keystore)
let mls_backend = MlsCryptoProvider::try_new_with_configuration(MlsCryptoProviderConfiguration {
db_path: &configuration.store_path,
identity_key: &configuration.identity_key,
in_memory: false,
entropy_seed: configuration.external_entropy.clone(),
})
.await?;
Self::new_with_backend(mls_backend, configuration).await
}
/// Same as the [MlsCentral::try_new] but instead, it uses an in memory KeyStore. Although required, the `store_path` parameter from the `MlsCentralConfiguration` won't be used here.
pub async fn try_new_in_memory(configuration: MlsCentralConfiguration) -> CryptoResult<Self> {
let mls_backend = MlsCryptoProvider::try_new_with_configuration(MlsCryptoProviderConfiguration {
db_path: &configuration.store_path,
identity_key: &configuration.identity_key,
in_memory: true,
entropy_seed: configuration.external_entropy.clone(),
})
.await?;
Self::new_with_backend(mls_backend, configuration).await
}
async fn new_with_backend(
mls_backend: MlsCryptoProvider,
configuration: MlsCentralConfiguration,
) -> CryptoResult<Self> {
let mls_client = Client::default();
// We create the core crypto instance first to enable creating a transaction from it and
// doing all subsequent actions inside a single transaction, though it forces us to clone
// a few Arcs and locks.
let central = Self {
mls_backend: mls_backend.clone(),
mls_client: mls_client.clone(),
transport: Arc::new(None.into()),
};
let cc = CoreCrypto::from(central);
let context = cc.new_transaction().await?;
if let Some(id) = configuration.client_id {
mls_client
.init(
ClientIdentifier::Basic(id),
configuration.ciphersuites.as_slice(),
&mls_backend,
configuration
.nb_init_key_packages
.unwrap_or(INITIAL_KEYING_MATERIAL_COUNT),
)
.await?
}
let central = cc.mls;
context.init_pki_env().await?;
context.finish().await?;
Ok(central)
}
/// Provide the implementation of functions to communicate with the delivery service
/// (see [MlsTransport]).
pub async fn provide_transport(&self, transport: Arc<dyn MlsTransport>) {
self.transport.write().await.replace(transport);
}
/// Returns the client's most recent public signature key as a buffer.
/// Used to upload a public key to the server in order to verify client's messages signature.
///
/// # Arguments
/// * `ciphersuite` - a callback to be called to perform authorization
/// * `credential_type` - of the credential to look for
pub async fn client_public_key(
&self,
ciphersuite: MlsCiphersuite,
credential_type: MlsCredentialType,
) -> CryptoResult<Vec<u8>> {
let cb = self
.mls_client
.find_most_recent_credential_bundle(ciphersuite.signature_algorithm(), credential_type)
.await?;
Ok(cb.signature_key.to_public_vec())
}
/// Returns the client's id as a buffer
pub async fn client_id(&self) -> CryptoResult<ClientId> {
self.mls_client.id().await
}
/// Checks if a given conversation id exists locally
pub async fn conversation_exists(&self, id: &ConversationId) -> CryptoResult<bool> {
Ok(self.get_conversation(id).await?.is_some())
}
/// Returns the epoch of a given conversation
///
/// # Errors
/// If the conversation can't be found
#[cfg_attr(test, crate::idempotent)]
pub async fn conversation_epoch(&self, id: &ConversationId) -> CryptoResult<u64> {
Ok(self
.get_conversation(id)
.await?
.ok_or_else(|| CryptoError::ConversationNotFound(id.clone()))?
.group
.epoch()
.as_u64())
}
/// Returns the ciphersuite of a given conversation
///
/// # Errors
/// If the conversation can't be found
#[cfg_attr(test, crate::idempotent)]
pub async fn conversation_ciphersuite(&self, id: &ConversationId) -> CryptoResult<MlsCiphersuite> {
Ok(self
.get_conversation(id)
.await?
.ok_or_else(|| CryptoError::ConversationNotFound(id.clone()))?
.ciphersuite())
}
/// Generates a random byte array of the specified size
pub fn random_bytes(&self, len: usize) -> CryptoResult<Vec<u8>> {
use openmls_traits::random::OpenMlsRand as _;
Ok(self.mls_backend.rand().random_vec(len)?)
}
/// Closes the connection with the local KeyStore
///
/// # Errors
/// KeyStore errors, such as IO
pub async fn close(self) -> CryptoResult<()> {
self.mls_backend.close().await?;
Ok(())
}
/// see [mls_crypto_provider::MlsCryptoProvider::reseed]
pub async fn reseed(&self, seed: Option<EntropySeed>) -> CryptoResult<()> {
self.mls_backend.reseed(seed)?;
Ok(())
}
}
impl CentralContext {
/// Initializes the MLS client if [super::CoreCrypto] has previously been initialized with
/// `CoreCrypto::deferred_init` instead of `CoreCrypto::new`.
/// This should stay as long as proteus is supported. Then it should be removed.
pub async fn mls_init(
&self,
identifier: ClientIdentifier,
ciphersuites: Vec<MlsCiphersuite>,
nb_init_key_packages: Option<usize>,
) -> CryptoResult<()> {
let nb_key_package = nb_init_key_packages.unwrap_or(INITIAL_KEYING_MATERIAL_COUNT);
let mls_client = self.mls_client().await?;
mls_client
.init(identifier, &ciphersuites, &self.mls_provider().await?, nb_key_package)
.await?;
if mls_client.is_e2ei_capable().await {
let client_id = mls_client.id().await?;
trace!(client_id:% = client_id; "Initializing PKI environment");
self.init_pki_env().await?;
}
Ok(())
}
/// Generates MLS KeyPairs/CredentialBundle with a temporary, random client ID.
/// This method is designed to be used in conjunction with [CentralContext::mls_init_with_client_id] and represents the first step in this process.
///
/// This returns the TLS-serialized identity keys (i.e. the signature keypair's public key)
#[cfg_attr(test, crate::dispotent)]
pub async fn mls_generate_keypairs(&self, ciphersuites: Vec<MlsCiphersuite>) -> CryptoResult<Vec<ClientId>> {
self.mls_client()
.await?
.generate_raw_keypairs(&ciphersuites, &self.mls_provider().await?)
.await
}
/// Updates the current temporary Client ID with the newly provided one. This is the second step in the externally-generated clients process
///
/// Important: This is designed to be called after [CentralContext::mls_generate_keypairs]
#[cfg_attr(test, crate::dispotent)]
pub async fn mls_init_with_client_id(
&self,
client_id: ClientId,
tmp_client_ids: Vec<ClientId>,
ciphersuites: Vec<MlsCiphersuite>,
) -> CryptoResult<()> {
self.mls_client()
.await?
.init_with_external_client_id(client_id, tmp_client_ids, &ciphersuites, &self.mls_provider().await?)
.await
}
/// see [MlsCentral::client_public_key]
pub async fn client_public_key(
&self,
ciphersuite: MlsCiphersuite,
credential_type: MlsCredentialType,
) -> CryptoResult<Vec<u8>> {
let cb = self
.mls_client()
.await?
.find_most_recent_credential_bundle(ciphersuite.signature_algorithm(), credential_type)
.await?;
Ok(cb.signature_key.to_public_vec())
}
/// see [MlsCentral::client_id]
pub async fn client_id(&self) -> CryptoResult<ClientId> {
self.mls_client().await?.id().await
}
/// Create a new empty conversation
///
/// # Arguments
/// * `id` - identifier of the group/conversation (must be unique otherwise the existing group
/// will be overridden)
/// * `creator_credential_type` - kind of credential the creator wants to create the group with
/// * `config` - configuration of the group/conversation
///
/// # Errors
/// Errors can happen from the KeyStore or from OpenMls for ex if no [openmls::key_packages::KeyPackage] can
/// be found in the KeyStore
#[cfg_attr(test, crate::dispotent)]
pub async fn new_conversation(
&self,
id: &ConversationId,
creator_credential_type: MlsCredentialType,
config: MlsConversationConfiguration,
) -> CryptoResult<()> {
if self.conversation_exists(id).await? || self.pending_group_exists(id).await? {
return Err(CryptoError::ConversationAlreadyExists(id.clone()));
}
let conversation = MlsConversation::create(
id.clone(),
&self.mls_client().await?,
creator_credential_type,
config,
&self.mls_provider().await?,
)
.await?;
self.mls_groups().await?.insert(id.clone(), conversation);
Ok(())
}
/// Checks if a given conversation id exists locally
pub async fn conversation_exists(&self, id: &ConversationId) -> CryptoResult<bool> {
Ok(self
.mls_groups()
.await?
.get_fetch(id, &self.mls_provider().await?.keystore(), None)
.await
.ok()
.flatten()
.is_some())
}
/// Returns the epoch of a given conversation
///
/// # Errors
/// If the conversation can't be found
#[cfg_attr(test, crate::idempotent)]
pub async fn conversation_epoch(&self, id: &ConversationId) -> CryptoResult<u64> {
Ok(self.get_conversation(id).await?.read().await.group.epoch().as_u64())
}
/// Returns the ciphersuite of a given conversation
///
/// # Errors
/// If the conversation can't be found
#[cfg_attr(test, crate::idempotent)]
pub async fn conversation_ciphersuite(&self, id: &ConversationId) -> CryptoResult<MlsCiphersuite> {
Ok(self.get_conversation(id).await?.read().await.ciphersuite())
}
/// Generates a random byte array of the specified size
pub async fn random_bytes(&self, len: usize) -> CryptoResult<Vec<u8>> {
use openmls_traits::random::OpenMlsRand as _;
Ok(self.mls_provider().await?.rand().random_vec(len)?)
}
}
#[cfg(test)]
mod tests {
use wasm_bindgen_test::*;
use crate::prelude::{CertificateBundle, ClientIdentifier, MlsCredentialType, INITIAL_KEYING_MATERIAL_COUNT};
use crate::{
mls::{CryptoError, MlsCentral, MlsCentralConfiguration},
test_utils::{x509::X509TestChain, *},
CoreCrypto,
};
wasm_bindgen_test_configure!(run_in_browser);
mod conversation_epoch {
use super::*;
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn can_get_newly_created_conversation_epoch(case: TestCase) {
run_test_with_central(case.clone(), move |[central]| {
Box::pin(async move {
let id = conversation_id();
central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await
.unwrap();
let epoch = central.context.conversation_epoch(&id).await.unwrap();
assert_eq!(epoch, 0);
})
})
.await;
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn can_get_conversation_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();
alice_central.invite_all(&case, &id, [&bob_central]).await.unwrap();
let epoch = alice_central.context.conversation_epoch(&id).await.unwrap();
assert_eq!(epoch, 1);
})
})
.await;
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn conversation_not_found(case: TestCase) {
run_test_with_central(case.clone(), move |[central]| {
Box::pin(async move {
let id = conversation_id();
let err = central.context.conversation_epoch(&id).await.unwrap_err();
assert!(matches!(err, CryptoError::ConversationNotFound(conv_id) if conv_id == id));
})
})
.await;
}
}
mod invariants {
use crate::prelude::MlsCiphersuite;
use super::*;
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn can_create_from_valid_configuration(case: TestCase) {
run_tests(move |[tmp_dir_argument]| {
Box::pin(async move {
let configuration = MlsCentralConfiguration::try_new(
tmp_dir_argument,
"test".to_string(),
Some("alice".into()),
vec![case.ciphersuite()],
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
)
.unwrap();
let central = MlsCentral::try_new(configuration).await;
assert!(central.is_ok())
})
})
.await
}
#[test]
#[wasm_bindgen_test]
fn store_path_should_not_be_empty_nor_blank() {
let ciphersuites = vec![MlsCiphersuite::default()];
let configuration = MlsCentralConfiguration::try_new(
" ".to_string(),
"test".to_string(),
Some("alice".into()),
ciphersuites,
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
);
assert!(matches!(
configuration.unwrap_err(),
CryptoError::MalformedIdentifier("store_path")
));
}
#[cfg_attr(not(target_family = "wasm"), async_std::test)]
#[wasm_bindgen_test]
async fn identity_key_should_not_be_empty_nor_blank() {
run_tests(|[tmp_dir_argument]| {
Box::pin(async move {
let ciphersuites = vec![MlsCiphersuite::default()];
let configuration = MlsCentralConfiguration::try_new(
tmp_dir_argument,
" ".to_string(),
Some("alice".into()),
ciphersuites,
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
);
assert!(matches!(
configuration.unwrap_err(),
CryptoError::MalformedIdentifier("identity_key")
));
})
})
.await
}
#[cfg_attr(not(target_family = "wasm"), async_std::test)]
#[wasm_bindgen_test]
async fn client_id_should_not_be_empty() {
run_tests(|[tmp_dir_argument]| {
Box::pin(async move {
let ciphersuites = vec![MlsCiphersuite::default()];
let configuration = MlsCentralConfiguration::try_new(
tmp_dir_argument,
"test".to_string(),
Some("".into()),
ciphersuites,
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
);
assert!(matches!(
configuration.unwrap_err(),
CryptoError::MalformedIdentifier("client_id")
));
})
})
.await
}
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn create_conversation_should_fail_when_already_exists(case: TestCase) {
run_test_with_client_ids(case.clone(), ["alice"], move |[alice_central]| {
Box::pin(async move {
let id = conversation_id();
let create = alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await;
assert!(create.is_ok());
// creating a conversation should first verify that the conversation does not already exist ; only then create it
let repeat_create = alice_central
.context
.new_conversation(&id, case.credential_type, case.cfg.clone())
.await;
assert!(matches!(repeat_create.unwrap_err(), CryptoError::ConversationAlreadyExists(i) if i == id));
})
})
.await;
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn can_fetch_client_public_key(case: TestCase) {
run_tests(move |[tmp_dir_argument]| {
Box::pin(async move {
let configuration = MlsCentralConfiguration::try_new(
tmp_dir_argument,
"test".to_string(),
Some("potato".into()),
vec![case.ciphersuite()],
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
)
.unwrap();
let result = MlsCentral::try_new(configuration.clone()).await;
assert!(result.is_ok());
})
})
.await
}
#[apply(all_cred_cipher)]
#[wasm_bindgen_test]
async fn can_2_phase_init_central(case: TestCase) {
run_tests(move |[tmp_dir_argument]| {
Box::pin(async move {
let x509_test_chain = X509TestChain::init_empty(case.signature_scheme());
let configuration = MlsCentralConfiguration::try_new(
tmp_dir_argument,
"test".to_string(),
None,
vec![case.ciphersuite()],
None,
Some(INITIAL_KEYING_MATERIAL_COUNT),
)
.unwrap();
// phase 1: init without mls_client
let central = MlsCentral::try_new(configuration).await.unwrap();
let cc = CoreCrypto::from(central);
let context = cc.new_transaction().await.unwrap();
x509_test_chain.register_with_central(&context).await;
assert!(!context.mls_client().await.unwrap().is_ready().await);
// phase 2: init mls_client
let client_id = "alice";
let identifier = match case.credential_type {
MlsCredentialType::Basic => ClientIdentifier::Basic(client_id.into()),
MlsCredentialType::X509 => {
CertificateBundle::rand_identifier(client_id, &[x509_test_chain.find_local_intermediate_ca()])
}
};
context
.mls_init(
identifier,
vec![case.ciphersuite()],
Some(INITIAL_KEYING_MATERIAL_COUNT),
)
.await
.unwrap();
assert!(context.mls_client().await.unwrap().is_ready().await);
// expect mls_client to work
assert_eq!(
context
.get_or_create_client_keypackages(case.ciphersuite(), case.credential_type, 2)
.await
.unwrap()
.len(),
2
);
})
})
.await
}
}