crypto: WIP cross signing bootstrap.

matrix_sdk/examples/cross_signing_bootstrap.rs

@@ -0,0 +1,119 @@
+use std::{
+    collections::BTreeMap,
+    env, io,
+    process::exit,
+    sync::atomic::{AtomicBool, Ordering},
+};
+
+use serde_json::json;
+use url::Url;
+
+use matrix_sdk::{
+    self,
+    api::r0::uiaa::AuthData,
+    identifiers::{user_id, UserId},
+    Client, ClientConfig, LoopCtrl, SyncSettings,
+};
+
+fn auth_data<'a>(user: &UserId, password: &str, session: Option<&'a str>) -> AuthData<'a> {
+    let mut auth_parameters = BTreeMap::new();
+    let identifier = json!({
+        "type": "m.id.user",
+        "user": user,
+    });
+
+    auth_parameters.insert("identifier".to_owned(), identifier);
+    auth_parameters.insert("password".to_owned(), password.to_owned().into());
+
+    // This is needed because of https://github.com/matrix-org/synapse/issues/5665
+    auth_parameters.insert("user".to_owned(), user.as_str().into());
+
+    AuthData::DirectRequest {
+        kind: "m.login.password",
+        auth_parameters,
+        session,
+    }
+}
+
+async fn bootstrap(client: Client) {
+    println!("Bootstrapping a new cross signing identity, press enter to continue.");
+
+    let mut input = String::new();
+
+    io::stdin()
+        .read_line(&mut input)
+        .expect("error: unable to read user input");
+
+    if let Err(e) = client.bootstrap_cross_signing(None).await {
+        if let Some(response) = e.uiaa_response() {
+            let auth_data = auth_data(
+                &user_id!("@example:localhost"),
+                "wordpass",
+                response.session.as_deref(),
+            );
+            client
+                .bootstrap_cross_signing(Some(auth_data))
+                .await
+                .expect("Couldn't bootstrap cross signing")
+        } else {
+            panic!("Error durign cross signing bootstrap {:#?}", e);
+        }
+    }
+}
+
+async fn login(
+    homeserver_url: String,
+    username: &str,
+    password: &str,
+) -> Result<(), matrix_sdk::Error> {
+    let client_config = ClientConfig::new()
+        .disable_ssl_verification()
+        .proxy("http://localhost:8080")
+        .unwrap();
+    let homeserver_url = Url::parse(&homeserver_url).expect("Couldn't parse the homeserver URL");
+    let client = Client::new_with_config(homeserver_url, client_config).unwrap();
+
+    client
+        .login(username, password, None, Some("rust-sdk"))
+        .await?;
+
+    let client_ref = &client;
+    let asked = AtomicBool::new(false);
+    let asked_ref = &asked;
+
+    client
+        .sync_with_callback(SyncSettings::new(), |_| async move {
+            let asked = asked_ref;
+            let client = &client_ref;
+
+            // Wait for sync to be done then ask the user to bootstrap.
+            if !asked.load(Ordering::SeqCst) {
+                tokio::spawn(bootstrap((*client).clone()));
+            }
+
+            asked.store(true, Ordering::SeqCst);
+            LoopCtrl::Continue
+        })
+        .await;
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<(), matrix_sdk::Error> {
+    tracing_subscriber::fmt::init();
+
+    let (homeserver_url, username, password) =
+        match (env::args().nth(1), env::args().nth(2), env::args().nth(3)) {
+            (Some(a), Some(b), Some(c)) => (a, b, c),
+            _ => {
+                eprintln!(
+                    "Usage: {} <homeserver_url> <username> <password>",
+                    env::args().next().unwrap()
+                );
+                exit(1)
+            }
+        };
+
+    login(homeserver_url, &username, &password).await
+}

matrix_sdk/src/client.rs

@@ -107,7 +107,7 @@ use matrix_sdk_common::{
 #[cfg(feature = "encryption")]
 use matrix_sdk_common::{
     api::r0::{
-        keys::{get_keys, upload_keys},
+        keys::{get_keys, upload_keys, upload_signing_keys::Request as UploadSigningKeysRequest},
         to_device::send_event_to_device::{
             Request as RumaToDeviceRequest, Response as ToDeviceResponse,
         },
@@ -1823,6 +1823,33 @@ impl Client {
         }))
     }
 
+    /// TODO
+    #[cfg(feature = "encryption")]
+    #[cfg_attr(feature = "docs", doc(cfg(encryption)))]
+    pub async fn bootstrap_cross_signing(&self, auth_data: Option<AuthData<'_>>) -> Result<()> {
+        let olm = self
+            .base_client
+            .olm_machine()
+            .await
+            .ok_or(Error::AuthenticationRequired)?;
+
+        let (request, signature_request) = olm.bootstrap_cross_signing(false).await?;
+
+        println!("HELLOOO MAKING REQUEST {:#?}", request);
+
+        let request = UploadSigningKeysRequest {
+            auth: auth_data,
+            master_key: request.master_key,
+            self_signing_key: request.self_signing_key,
+            user_signing_key: request.user_signing_key,
+        };
+
+        self.send(request).await?;
+        self.send(signature_request).await?;
+
+        Ok(())
+    }
+
     /// Get a map holding all the devices of an user.
     ///
     /// This will always return an empty map if the client hasn't been logged

matrix_sdk_common/Cargo.toml

@@ -20,7 +20,7 @@ js_int = "0.1.9"
 
 [dependencies.ruma]
 version = "0.0.1"
-git = "https://github.com/ruma/ruma"
+path = "/home/poljar/werk/priv/ruma/ruma"
 rev = "db2f58032953ccb6d8ae712d64d713ebdf412598"
 features = ["client-api", "unstable-pre-spec", "unstable-exhaustive-types"]
 

matrix_sdk_crypto/src/error.rs

@@ -148,6 +148,9 @@ pub enum SignatureError {
     #[error("the provided JSON object can't be converted to a canonical representation")]
     CanonicalJsonError(CjsonError),
 
+    #[error(transparent)]
+    JsonError(#[from] SerdeError),
+
     #[error("the signature didn't match the provided key")]
     VerificationError,
 }

matrix_sdk_crypto/src/machine.rs

@@ -26,6 +26,7 @@ use matrix_sdk_common::{
             claim_keys::{Request as KeysClaimRequest, Response as KeysClaimResponse},
             get_keys::Response as KeysQueryResponse,
             upload_keys,
+            upload_signatures::Request as UploadSignaturesRequest,
         },
         sync::sync_events::Response as SyncResponse,
     },
@@ -95,6 +96,7 @@ pub struct OlmMachine {
     /// State machine handling public user identities and devices, keeping track
     /// of when a key query needs to be done and handling one.
     identity_manager: IdentityManager,
+    cross_signing_request: Arc<Mutex<Option<UploadSignaturesRequest>>>,
 }
 
 #[cfg(not(tarpaulin_include))]
@@ -181,13 +183,14 @@ impl OlmMachine {
             user_id,
             device_id,
             account,
+            user_identity,
             store,
             session_manager,
             group_session_manager,
             verification_machine,
             key_request_machine,
             identity_manager,
-            user_identity,
+            cross_signing_request: Arc::new(Mutex::new(None)),
         }
     }
 
@@ -369,12 +372,32 @@ impl OlmMachine {
     /// devices.
     ///
     /// Uploading these keys will require user interactive auth.
-    pub async fn bootstrap_cross_signing(&self) -> StoreResult<UploadSigningKeysRequest> {
-        // TODO should we save the request until we get a response?
+    pub async fn bootstrap_cross_signing(
+        &self,
+        reset: bool,
+    ) -> StoreResult<(UploadSigningKeysRequest, UploadSignaturesRequest)> {
         let mut identity = self.user_identity.lock().await;
-        *identity = PrivateCrossSigningIdentity::new(self.user_id().to_owned()).await;
-        self.store.save_identity(identity.clone()).await?;
-        Ok(identity.as_upload_request().await)
+
+        if identity.is_empty().await || reset {
+            info!("Creating new cross signing identity");
+            let (id, signature_request) = self.account.bootstrap_cross_signing().await;
+            let request = id.as_upload_request().await;
+
+            *identity = id;
+
+            self.store.save_identity(identity.clone()).await?;
+            Ok((request, signature_request))
+        } else {
+            info!("Trying to upload the existing cross signing identity");
+            let request = identity.as_upload_request().await;
+            let device_keys = self.account.unsigned_device_keys();
+            // TODO remove this expect.
+            let signature_request = identity
+                .sign_device(device_keys)
+                .await
+                .expect("Can't sign device keys");
+            Ok((request, signature_request))
+        }
     }
 
     /// Should device or one-time keys be uploaded to the server.

matrix_sdk_crypto/src/olm/account.rs

@@ -30,7 +30,9 @@ use tracing::{debug, trace, warn};
 #[cfg(test)]
 use matrix_sdk_common::events::EventType;
 use matrix_sdk_common::{
-    api::r0::keys::{upload_keys, OneTimeKey, SignedKey},
+    api::r0::keys::{
+        upload_keys, upload_signatures::Request as SignatureUploadRequest, OneTimeKey, SignedKey,
+    },
     encryption::DeviceKeys,
     events::{room::encrypted::EncryptedEventContent, AnyToDeviceEvent},
     identifiers::{
@@ -50,13 +52,16 @@ use olm_rs::{
 };
 
 use crate::{
-    error::{EventError, OlmResult, SessionCreationError},
+    error::{EventError, OlmResult, SessionCreationError, SignatureError},
     identities::ReadOnlyDevice,
     store::Store,
     OlmError,
 };
 
-use super::{EncryptionSettings, InboundGroupSession, OutboundGroupSession, Session};
+use super::{
+    EncryptionSettings, InboundGroupSession, OutboundGroupSession, PrivateCrossSigningIdentity,
+    Session,
+};
 
 #[derive(Debug, Clone)]
 pub struct Account {
@@ -618,9 +623,7 @@ impl ReadOnlyAccount {
         })
     }
 
-    /// Sign the device keys of the account and return them so they can be
-    /// uploaded.
-    pub(crate) async fn device_keys(&self) -> DeviceKeys {
+    pub(crate) fn unsigned_device_keys(&self) -> DeviceKeys {
         let identity_keys = self.identity_keys();
 
         let mut keys = BTreeMap::new();
@@ -634,34 +637,41 @@ impl ReadOnlyAccount {
             identity_keys.ed25519().to_owned(),
         );
 
-        let device_keys = json!({
-            "user_id": (*self.user_id).clone(),
-            "device_id": (*self.device_id).clone(),
-            "algorithms": Self::ALGORITHMS,
-            "keys": keys,
-        });
-
-        let mut signatures = BTreeMap::new();
-
-        let mut signature = BTreeMap::new();
-        signature.insert(
-            DeviceKeyId::from_parts(DeviceKeyAlgorithm::Ed25519, &self.device_id),
-            self.sign_json(&device_keys).await,
-        );
-        signatures.insert((*self.user_id).clone(), signature);
-
         DeviceKeys::new(
             (*self.user_id).clone(),
             (*self.device_id).clone(),
-            vec![
-                EventEncryptionAlgorithm::OlmV1Curve25519AesSha2,
-                EventEncryptionAlgorithm::MegolmV1AesSha2,
-            ],
+            Self::ALGORITHMS.iter().map(|a| (&**a).clone()).collect(),
             keys,
-            signatures,
+            BTreeMap::new(),
         )
     }
 
+    /// Sign the device keys of the account and return them so they can be
+    /// uploaded.
+    pub(crate) async fn device_keys(&self) -> DeviceKeys {
+        let mut device_keys = self.unsigned_device_keys();
+        let jsond_device_keys = serde_json::to_value(&device_keys).unwrap();
+
+        device_keys
+            .signatures
+            .entry(self.user_id().clone())
+            .or_insert_with(BTreeMap::new)
+            .insert(
+                DeviceKeyId::from_parts(DeviceKeyAlgorithm::Ed25519, &self.device_id),
+                self.sign_json(jsond_device_keys)
+                    .await
+                    .expect("Can't sign own device keys"),
+            );
+
+        device_keys
+    }
+
+    pub(crate) async fn bootstrap_cross_signing(
+        &self,
+    ) -> (PrivateCrossSigningIdentity, SignatureUploadRequest) {
+        PrivateCrossSigningIdentity::new_with_account(self).await
+    }
+
     /// Convert a JSON value to the canonical representation and sign the JSON
     /// string.
     ///
@@ -673,10 +683,13 @@ impl ReadOnlyAccount {
     /// # Panic
     ///
     /// Panics if the json value can't be serialized.
-    pub async fn sign_json(&self, json: &Value) -> String {
-        let canonical_json = cjson::to_string(json)
-            .unwrap_or_else(|_| panic!(format!("Can't serialize {} to canonical JSON", json)));
-        self.sign(&canonical_json).await
+    pub async fn sign_json(&self, mut json: Value) -> Result<String, SignatureError> {
+        let json_object = json.as_object_mut().ok_or(SignatureError::NotAnObject)?;
+        let _ = json_object.remove("unsigned");
+        let _ = json_object.remove("signatures");
+
+        let canonical_json = cjson::to_string(&json)?;
+        Ok(self.sign(&canonical_json).await)
     }
 
     pub(crate) async fn signed_one_time_keys_helper(
@@ -690,7 +703,10 @@ impl ReadOnlyAccount {
                 "key": key,
             });
 
-            let signature = self.sign_json(&key_json).await;
+            let signature = self
+                .sign_json(key_json)
+                .await
+                .expect("Can't sign own one-time keys");
 
             let mut signature_map = BTreeMap::new();
 

matrix_sdk_crypto/src/olm/signing.rs

@@ -20,8 +20,12 @@ use aes_gcm::{
 };
 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;
+use serde_json::{Error as JsonError, Value};
 use std::{
     collections::BTreeMap,
     sync::{
@@ -35,16 +39,22 @@ use zeroize::Zeroizing;
 use olm_rs::{errors::OlmUtilityError, pk::OlmPkSigning, utility::OlmUtility};
 
 use matrix_sdk_common::{
-    api::r0::keys::{CrossSigningKey, KeyUsage},
+    api::r0::keys::{
+        upload_signatures::Request as SignatureUploadRequest, CrossSigningKey, KeyUsage,
+    },
     identifiers::UserId,
     locks::Mutex,
 };
 
 use crate::{
+    error::SignatureError,
     identities::{MasterPubkey, SelfSigningPubkey, UserSigningPubkey},
     requests::UploadSigningKeysRequest,
+    UserIdentity,
 };
 
+use crate::ReadOnlyAccount;
+
 const NONCE_SIZE: usize = 12;
 
 fn encode<T: AsRef<[u8]>>(input: T) -> String {
@@ -163,6 +173,10 @@ impl UserSigning {
         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)?;
 
@@ -180,6 +194,29 @@ impl SelfSigning {
         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)?;
 
@@ -346,6 +383,13 @@ impl Signing {
         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))
     }
@@ -356,6 +400,14 @@ impl PrivateCrossSigningIdentity {
         &self.user_id
     }
 
+    pub async fn is_empty(&self) -> bool {
+        let has_master = self.master_key.lock().await.is_some();
+        let has_user = self.user_signing_key.lock().await.is_some();
+        let has_self = self.self_signing_key.lock().await.is_some();
+
+        !(has_master && has_user && has_self)
+    }
+
     pub(crate) fn empty(user_id: UserId) -> Self {
         Self {
             user_id: Arc::new(user_id),
@@ -366,6 +418,94 @@ impl PrivateCrossSigningIdentity {
         }
     }
 
+    pub(crate) async fn sign_device(
+        &self,
+        mut device_keys: DeviceKeys,
+    ) -> Result<SignatureUploadRequest, SignatureError> {
+        self.self_signing_key
+            .lock()
+            .await
+            .as_ref()
+            .ok_or(SignatureError::MissingSigningKey)?
+            .sign_device(&mut device_keys)
+            .await?;
+
+        let mut signed_keys = BTreeMap::new();
+        signed_keys
+            .entry((&*self.user_id).to_owned())
+            .or_insert_with(BTreeMap::new)
+            .insert(
+                device_keys.device_id.to_string(),
+                serde_json::to_value(device_keys)?,
+            );
+
+        Ok(SignatureUploadRequest { signed_keys })
+    }
+
+    pub(crate) async fn new_with_account(
+        account: &ReadOnlyAccount,
+    ) -> (Self, SignatureUploadRequest) {
+        let master = Signing::new();
+
+        let mut public_key =
+            master.cross_signing_key(account.user_id().to_owned(), KeyUsage::Master);
+        let signature = account
+            .sign_json(
+                serde_json::to_value(&public_key)
+                    .expect("Can't convert own public master key to json"),
+            )
+            .await
+            .expect("Can't sign own public master key");
+        public_key
+            .signatures
+            .entry(account.user_id().to_owned())
+            .or_insert_with(BTreeMap::new)
+            .insert(format!("ed25519:{}", account.device_id()), signature);
+
+        let master = MasterSigning {
+            inner: master,
+            public_key: public_key.into(),
+        };
+
+        let identity = Self::new_helper(account.user_id(), master).await;
+        let device_keys = account.unsigned_device_keys();
+        let request = identity
+            .sign_device(device_keys)
+            .await
+            .expect("Can't sign own device with new cross signign keys");
+
+        (identity, request)
+    }
+
+    async fn new_helper(user_id: &UserId, master: MasterSigning) -> Self {
+        let user = Signing::new();
+        let mut public_key = user.cross_signing_key(user_id.to_owned(), KeyUsage::UserSigning);
+        master.sign_subkey(&mut public_key).await;
+
+        let user = UserSigning {
+            inner: user,
+            public_key: public_key.into(),
+        };
+
+        let self_signing = Signing::new();
+        let mut public_key =
+            self_signing.cross_signing_key(user_id.to_owned(), KeyUsage::SelfSigning);
+        master.sign_subkey(&mut public_key).await;
+
+        let self_signing = SelfSigning {
+            inner: self_signing,
+            public_key: public_key.into(),
+        };
+
+        Self {
+            user_id: Arc::new(user_id.to_owned()),
+            shared: Arc::new(AtomicBool::new(false)),
+            master_key: Arc::new(Mutex::new(Some(master))),
+            self_signing_key: Arc::new(Mutex::new(Some(self_signing))),
+            user_signing_key: Arc::new(Mutex::new(Some(user))),
+        }
+    }
+
     pub(crate) async fn new(user_id: UserId) -> Self {
         let master = Signing::new();
 
@@ -520,6 +660,8 @@ impl PrivateCrossSigningIdentity {
 
 #[cfg(test)]
 mod test {
+    use crate::olm::ReadOnlyAccount;
+
     use super::{PrivateCrossSigningIdentity, Signing};
 
     use matrix_sdk_common::identifiers::{user_id, UserId};
@@ -617,4 +759,14 @@ mod test {
             &*unpickled.self_signing_key.lock().await
         );
     }
+
+    #[async_test]
+    async fn private_identity_signed_by_accound() {
+        let account = ReadOnlyAccount::new(&user_id(), "DEVICEID".into());
+        let (identity, _) = PrivateCrossSigningIdentity::new_with_account(&account).await;
+        let master = identity.master_key.lock().await;
+        let master = master.as_ref().unwrap();
+
+        assert!(!master.public_key.signatures().is_empty());
+    }
 }