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Abstract event validation/fetching, add outlier and signing key DB trees

Browse source 
Fixed the miss named commented out keys in conduit-example.toml.
This commit is contained in:
Devin Ragotzy 2021-01-14 21:32:22 -05:00
parent 2ac3ffbb24
commit 851eb555b6
7 changed files with 416 additions and 414 deletions
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6
conduit-example.toml
View file

@ -23,12 +23,12 @@ port = 6167
max_request_size = 20_000_000 # in bytes
# Disable registration. No new users will be able to register on this server
#registration_disabled = false
#allow_registration = false
# Disable encryption, so no new encrypted rooms can be created
# Note: existing rooms will continue to work
#encryption_disabled = false
#federation_disabled = false
#allow_encryption = false
#allow_federation = false
#cache_capacity = 1073741824 # in bytes, 1024 * 1024 * 1024
#max_concurrent_requests = 4 # How many requests Conduit sends to other servers at the same time

10
src/database.rs
View file

@ -22,7 +22,7 @@ use std::fs::remove_dir_all;
use std::sync::{Arc, RwLock};
use tokio::sync::Semaphore;
#[derive(Clone, Deserialize)]
#[derive(Clone, Debug, Deserialize)]
pub struct Config {
server_name: Box<ServerName>,
database_path: String,
@ -102,7 +102,12 @@ impl Database {
let (admin_sender, admin_receiver) = mpsc::unbounded();
let db = Self {
globals: globals::Globals::load(db.open_tree("global")?, config).await?,
globals: globals::Globals::load(
db.open_tree("global")?,
db.open_tree("servertimeout_signingkey")?,
config,
)
.await?,
users: users::Users {
userid_password: db.open_tree("userid_password")?,
userid_displayname: db.open_tree("userid_displayname")?,
@ -155,6 +160,7 @@ impl Database {
stateid_pduid: db.open_tree("stateid_pduid")?,
pduid_statehash: db.open_tree("pduid_statehash")?,
roomid_statehash: db.open_tree("roomid_statehash")?,
eventid_outlierpdu: db.open_tree("eventid_outlierpdu")?,
},
account_data: account_data::AccountData {
roomuserdataid_accountdata: db.open_tree("roomuserdataid_accountdata")?,

77
src/database/globals.rs
View file

@ -1,7 +1,10 @@
use crate::{database::Config, utils, Error, Result};
use log::error;
use ruma::ServerName;
use std::collections::HashMap;
use ruma::{
api::federation::discovery::{ServerSigningKeys, VerifyKey},
ServerName, ServerSigningKeyId,
};
use std::collections::{BTreeMap, HashMap};
use std::sync::Arc;
use std::sync::RwLock;
use std::time::Duration;
@ -19,10 +22,15 @@ pub struct Globals {
reqwest_client: reqwest::Client,
pub actual_destination_cache: DestinationCache, // actual_destination, host
dns_resolver: TokioAsyncResolver,
pub(super) servertimeout_signingkey: sled::Tree, // ServerName -> algorithm:key + pubkey
}
impl Globals {
pub async fn load(globals: sled::Tree, config: Config) -> Result<Self> {
pub async fn load(
globals: sled::Tree,
server_keys: sled::Tree,
config: Config,
) -> Result<Self> {
let bytes = &*globals
.update_and_fetch("keypair", utils::generate_keypair)?
.expect("utils::generate_keypair always returns Some");
@ -75,6 +83,7 @@ impl Globals {
Error::bad_config("Failed to set up trust dns resolver with system config.")
})?,
actual_destination_cache: Arc::new(RwLock::new(HashMap::new())),
servertimeout_signingkey: server_keys,
})
}
@ -128,4 +137,66 @@ impl Globals {
pub fn dns_resolver(&self) -> &TokioAsyncResolver {
&self.dns_resolver
}
/// TODO: the key valid until timestamp is only honored in room version > 4
/// Remove the outdated keys and insert the new ones.
///
/// This doesn't actually check that the keys provided are newer than the old set.
pub fn add_signing_key(&self, origin: &ServerName, keys: &ServerSigningKeys) -> Result<()> {
// Remove outdated keys
let now = crate::utils::millis_since_unix_epoch();
for item in self.servertimeout_signingkey.scan_prefix(origin.as_bytes()) {
let (k, _) = item?;
let valid_until = k
.splitn(2, |&b| b == 0xff)
.nth(1)
.map(crate::utils::u64_from_bytes)
.ok_or_else(|| Error::bad_database("Invalid signing keys."))?
.map_err(|_| Error::bad_database("Invalid signing key valid until bytes"))?;
if now > valid_until {
self.servertimeout_signingkey.remove(k)?;
}
}
let mut key = origin.as_bytes().to_vec();
key.push(0xff);
key.extend_from_slice(
&(keys
.valid_until_ts
.duration_since(std::time::UNIX_EPOCH)
.expect("time is valid")
.as_millis() as u64)
.to_be_bytes(),
);
self.servertimeout_signingkey.insert(
key,
serde_json::to_vec(&keys.verify_keys).expect("ServerSigningKeys are a valid string"),
)?;
Ok(())
}
/// This returns an empty `Ok(BTreeMap<..>)` when there are no keys found for the server.
pub fn signing_keys_for(
&self,
origin: &ServerName,
) -> Result<BTreeMap<ServerSigningKeyId, VerifyKey>> {
let now = crate::utils::millis_since_unix_epoch();
for item in self.servertimeout_signingkey.scan_prefix(origin.as_bytes()) {
let (k, bytes) = item?;
let valid_until = k
.splitn(2, |&b| b == 0xff)
.nth(1)
.map(crate::utils::u64_from_bytes)
.ok_or_else(|| Error::bad_database("Invalid signing keys."))?
.map_err(|_| Error::bad_database("Invalid signing key valid until bytes"))?;
// If these keys are still valid use em!
if valid_until > now {
return serde_json::from_slice(&bytes)
.map_err(|_| Error::bad_database("Invalid BTreeMap<> of signing keys"));
}
}
Ok(BTreeMap::default())
}
}

97
src/database/rooms.rs
View file

@ -65,6 +65,9 @@ pub struct Rooms {
/// The state for a given state hash.
pub(super) statekey_short: sled::Tree, // StateKey = EventType + StateKey, Short = Count
pub(super) stateid_pduid: sled::Tree, // StateId = StateHash + Short, PduId = Count (without roomid)
/// Any pdu that has passed the steps up to auth with auth_events.
pub(super) eventid_outlierpdu: sled::Tree,
}
impl Rooms {
@ -188,72 +191,6 @@ impl Rooms {
Ok(events)
}
/// Returns a Vec of the related auth events to the given `event`.
///
/// A recursive list of all the auth_events going back to `RoomCreate` for each event in `event_ids`.
pub fn auth_events_full(
&self,
_room_id: &RoomId,
event_ids: &[EventId],
) -> Result<Vec<PduEvent>> {
let mut result = BTreeMap::new();
let mut stack = event_ids.to_vec();
// DFS for auth event chain
while !stack.is_empty() {
let ev_id = stack.pop().unwrap();
if result.contains_key(&ev_id) {
continue;
}
if let Some(ev) = self.get_pdu(&ev_id)? {
stack.extend(ev.auth_events());
result.insert(ev.event_id().clone(), ev);
}
}
Ok(result.into_iter().map(|(_, v)| v).collect())
}
/// Returns a Vec<EventId> representing the difference in auth chains of the given `events`.
///
/// Each inner `Vec` of `event_ids` represents a state set (state at each forward extremity).
pub fn auth_chain_diff(
&self,
room_id: &RoomId,
event_ids: Vec<Vec<EventId>>,
) -> Result<Vec<EventId>> {
use std::collections::BTreeSet;
let mut chains = vec![];
for ids in event_ids {
// TODO state store `auth_event_ids` returns self in the event ids list
// when an event returns `auth_event_ids` self is not contained
let chain = self
.auth_events_full(room_id, &ids)?
.into_iter()
.map(|pdu| pdu.event_id)
.collect::<BTreeSet<_>>();
chains.push(chain);
}
if let Some(chain) = chains.first() {
let rest = chains.iter().skip(1).flatten().cloned().collect();
let common = chain.intersection(&rest).collect::<Vec<_>>();
Ok(chains
.iter()
.flatten()
.filter(|id| !common.contains(&id))
.cloned()
.collect::<BTreeSet<_>>()
.into_iter()
.collect())
} else {
Ok(vec![])
}
}
/// Generate a new StateHash.
///
/// A unique hash made from hashing all PDU ids of the state joined with 0xff.
@ -475,6 +412,31 @@ impl Rooms {
Ok(())
}
/// Returns the pdu from the outlier tree.
pub fn get_pdu_outlier(&self, event_id: &EventId) -> Result<Option<PduEvent>> {
self.eventid_outlierpdu
.get(event_id.as_bytes())?
.map_or(Ok(None), |pdu| {
Ok(Some(
serde_json::from_slice(&pdu)
.map_err(|_| Error::bad_database("Invalid PDU in db."))?,
))
})
}
/// Returns true if the event_id was previously inserted.
pub fn append_pdu_outlier(&self, event_id: &EventId, pdu: &PduEvent) -> Result<bool> {
log::info!("Number of outlier pdu's {}", self.eventid_outlierpdu.len());
let res = self
.eventid_outlierpdu
.insert(
event_id.as_bytes(),
&*serde_json::to_string(&pdu).expect("PduEvent is always a valid String"),
)
.map(|op| op.is_some())?;
Ok(res)
}
/// Creates a new persisted data unit and adds it to a room.
///
/// By this point the incoming event should be fully authenticated, no auth happens
@ -516,6 +478,9 @@ impl Rooms {
}
}
// We no longer keep this pdu as an outlier
self.eventid_outlierpdu.remove(pdu.event_id().as_bytes())?;
self.replace_pdu_leaves(&pdu.room_id, &pdu.event_id)?;
// Mark as read first so the sending client doesn't get a notification even if appending

7
src/error.rs
View file

@ -122,10 +122,9 @@ impl log::Log for ConduitLogger {
let output = format!("{} - {}", record.level(), record.args());
if self.enabled(record.metadata())
&& (record
.module_path()
.map_or(false, |path| path.starts_with("conduit::"))
|| record
&& (record.module_path().map_or(false, |path| {
path.starts_with("conduit::") || path.starts_with("state")
}) || record
.module_path()
.map_or(true, |path| !path.starts_with("rocket::")) // Rockets logs are annoying
&& record.metadata().level() <= log::Level::Warn)

1
src/main.rs
View file

@ -155,6 +155,7 @@ fn setup_rocket() -> rocket::Rocket {
.figment()
.extract()
.expect("It looks like your config is invalid. Please take a look at the error");
let data = Database::load_or_create(config)
.await
.expect("config is valid");

632
src/server_server.rs
View file

@ -1,5 +1,4 @@
use crate::{client_server, utils, ConduitResult, Database, Error, PduEvent, Result, Ruma};
use get_devices::v1::UserDevice;
use get_profile_information::v1::ProfileField;
use http::header::{HeaderValue, AUTHORIZATION, HOST};
use log::{error, info, warn};
@ -7,7 +6,6 @@ use rocket::{get, post, put, response::content::Json, State};
use ruma::{
api::{
federation::{
device::get_devices,
directory::{get_public_rooms, get_public_rooms_filtered},
discovery::{
get_server_keys, get_server_version::v1 as get_server_version, ServerSigningKeys,
@ -20,7 +18,6 @@ use ruma::{
OutgoingRequest,
},
directory::{IncomingFilter, IncomingRoomNetwork},
events::pdu::Pdu,
serde::to_canonical_value,
signatures::{CanonicalJsonObject, CanonicalJsonValue, PublicKeyMap},
EventId, RoomId, RoomVersionId, ServerName, ServerSigningKeyId, UserId,
@ -28,9 +25,12 @@ use ruma::{
use state_res::{Event, EventMap, StateMap};
use std::{
collections::{BTreeMap, BTreeSet},
convert::{TryFrom, TryInto},
convert::TryFrom,
fmt::Debug,
future::Future,
net::{IpAddr, SocketAddr},
pin::Pin,
result::Result as StdResult,
sync::Arc,
time::{Duration, SystemTime},
};
@ -575,6 +575,26 @@ pub async fn send_transaction_message_route<'a>(
// We do not add the event_id field to the pdu here because of signature and hashes checks
let (event_id, value) = crate::pdu::gen_event_id_canonical_json(pdu);
// If we have no idea about this room skip the PDU
let room_id = match value
.get("room_id")
.map(|id| match id {
CanonicalJsonValue::String(id) => RoomId::try_from(id.as_str()).ok(),
_ => None,
})
.flatten()
{
Some(id) => id,
None => {
resolved_map.insert(event_id, Err("Event needs a valid RoomId".to_string()));
continue;
}
};
if !db.rooms.exists(&room_id)? {
resolved_map.insert(event_id, Err("Room is unknown to this server".to_string()));
continue;
}
let server_name = &body.body.origin;
let mut pub_key_map = BTreeMap::new();
if let Some(sig) = value.get("signatures") {
@ -583,20 +603,12 @@ pub async fn send_transaction_message_route<'a>(
for key in entity.keys() {
// TODO: save this in a DB maybe...
// fetch the public signing key
let res = db
.sending
.send_federation_request(
&db.globals,
<&ServerName>::try_from(key.as_str()).unwrap(),
get_server_keys::v2::Request::new(),
)
.await?;
let origin = <&ServerName>::try_from(key.as_str()).unwrap();
let keys = fetch_signing_keys(&db, origin).await?;
pub_key_map.insert(
res.server_key.server_name.to_string(),
res.server_key
.verify_keys
.into_iter()
origin.to_string(),
keys.into_iter()
.map(|(k, v)| (k.to_string(), v.key))
.collect(),
);
@ -615,10 +627,31 @@ pub async fn send_transaction_message_route<'a>(
continue;
}
// Ruma/PduEvent satisfies - 1. Is a valid event, otherwise it is dropped.
// 2. Passes signature checks, otherwise event is dropped.
// 3. Passes hash checks, otherwise it is redacted before being processed further.
let mut val = match signature_and_hash_check(&pub_key_map, value) {
// TODO: make this persist but not a DB Tree...
// This is all the auth_events that have been recursively fetched so they don't have to be
// deserialized over and over again. This could potentially also be some sort of trie (suffix tree)
// like structure so that once an auth event is known it would know (using indexes maybe) all of
// the auth events that it references.
let mut auth_cache = EventMap::new();
// 1. check the server is in the room (optional)
// 2. check content hash, redact if doesn't match
// 3. fetch any missing auth events doing all checks listed here starting at 1. These are not timeline events
// 4. reject "due to auth events" if can't get all the auth events or some of the auth events are also rejected "due to auth events"
// 5. reject "due to auth events" if the event doesn't pass auth based on the auth events
// 6. persist this event as an outlier
// 7. if not timeline event: stop
let pdu = match validate_event(
&db,
value,
event_id.clone(),
&pub_key_map,
server_name,
// All the auth events gathered will be here
&mut auth_cache,
)
.await
{
Ok(pdu) => pdu,
Err(e) => {
resolved_map.insert(event_id, Err(e));
@ -626,59 +659,31 @@ pub async fn send_transaction_message_route<'a>(
}
};
// Now that we have checked the signature and hashes we can add the eventID and convert
// to our PduEvent type also finally verifying the first step listed above
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id).expect("EventId is a valid CanonicalJsonValue"),
);
let pdu = match serde_json::from_value::<PduEvent>(
serde_json::to_value(val).expect("CanonicalJsonObj is a valid JsonValue"),
) {
Ok(pdu) => pdu,
Err(_) => {
resolved_map.insert(event_id, Err("Event is not a valid PDU".into()));
continue;
}
};
let pdu = Arc::new(pdu.clone());
// If we have no idea about this room skip the PDU
if !db.rooms.exists(&pdu.room_id)? {
resolved_map.insert(event_id, Err("Room is unknown to this server".into()));
continue;
}
let event = Arc::new(pdu.clone());
dbg!(&*event);
// Fetch any unknown prev_events or retrieve them from the DB
let previous = match fetch_events(&db, server_name, &pub_key_map, &pdu.prev_events).await {
Ok(mut evs) if evs.len() == 1 => Some(Arc::new(evs.remove(0))),
let previous = match fetch_events(
&db,
server_name,
&pub_key_map,
&pdu.prev_events,
&mut auth_cache,
)
.await
{
Ok(mut evs) if evs.len() == 1 => Some(evs.remove(0)),
_ => None,
};
// 4. Passes authorization rules based on the event's auth events, otherwise it is rejected.
// Recursively gather all auth events checking that the previous auth events are valid.
let auth_events: Vec<PduEvent> =
match fetch_check_auth_events(&db, server_name, &pub_key_map, &pdu.prev_events).await {
Ok(events) => events,
Err(_) => {
resolved_map.insert(
pdu.event_id,
Err("Failed to recursively gather auth events".into()),
);
continue;
}
};
let mut event_map: state_res::EventMap<Arc<PduEvent>> = auth_events
let mut event_map: state_res::EventMap<Arc<PduEvent>> = auth_cache
.iter()
.map(|v| (v.event_id().clone(), Arc::new(v.clone())))
.map(|(k, v)| (k.clone(), v.clone()))
.collect();
// Check that the event passes auth based on the auth_events
let is_authed = state_res::event_auth::auth_check(
&RoomVersionId::Version6,
&event,
&pdu,
previous.clone(),
&pdu.auth_events
.iter()
@ -696,9 +701,10 @@ pub async fn send_transaction_message_route<'a>(
None, // TODO: third party invite
)
.map_err(|_e| Error::Conflict("Auth check failed"))?;
if !is_authed {
resolved_map.insert(
pdu.event_id,
pdu.event_id().clone(),
Err("Event has failed auth check with auth events".into()),
);
continue;
@ -720,7 +726,14 @@ pub async fn send_transaction_message_route<'a>(
.await
{
Ok(res) => {
let state = fetch_events(&db, server_name, &pub_key_map, &res.pdu_ids).await?;
let state = fetch_events(
&db,
server_name,
&pub_key_map,
&res.pdu_ids,
&mut auth_cache,
)
.await?;
// Sanity check: there are no conflicting events in the state we received
let mut seen = BTreeSet::new();
for ev in &state {
@ -732,21 +745,26 @@ pub async fn send_transaction_message_route<'a>(
let state = state
.into_iter()
.map(|pdu| ((pdu.kind.clone(), pdu.state_key.clone()), Arc::new(pdu)))
.map(|pdu| ((pdu.kind.clone(), pdu.state_key.clone()), pdu))
.collect();
(
state,
fetch_events(&db, server_name, &pub_key_map, &res.auth_chain_ids)
.await?
.into_iter()
.map(Arc::new)
.collect(),
fetch_events(
&db,
server_name,
&pub_key_map,
&res.auth_chain_ids,
&mut auth_cache,
)
.await?
.into_iter()
.collect(),
)
}
Err(_) => {
resolved_map.insert(
event.event_id().clone(),
pdu.event_id().clone(),
Err("Fetching state for event failed".into()),
);
continue;
@ -755,7 +773,7 @@ pub async fn send_transaction_message_route<'a>(
if !state_res::event_auth::auth_check(
&RoomVersionId::Version6,
&event,
&pdu,
previous.clone(),
&state_at_event,
None, // TODO: third party invite
@ -764,37 +782,21 @@ pub async fn send_transaction_message_route<'a>(
{
// Event failed auth with state_at
resolved_map.insert(
pdu.event_id,
event_id,
Err("Event has failed auth check with state at the event".into()),
);
continue;
}
// End of step 5.
// The event could still be soft failed
append_state_soft(&db, &pdu)?;
// Gather the forward extremities and resolve
let forward_extrems = forward_extremity_ids(&db, &pdu.room_id)?;
let mut fork_states: Vec<StateMap<Arc<PduEvent>>> = vec![];
for id in &forward_extrems {
if let Some(id) = db.rooms.get_pdu_id(id)? {
let state_hash = db
.rooms
.pdu_state_hash(&id)?
.expect("found pdu with no statehash");
let state = db
.rooms
.state_full(&pdu.room_id, &state_hash)?
.into_iter()
.map(|(k, v)| ((k.0, Some(k.1)), Arc::new(v)))
.collect();
fork_states.push(state);
} else {
todo!("we don't know of a pdu that is part of our known forks OOPS")
let fork_states = match forward_extremity_ids(&db, &pdu) {
Ok(states) => states,
Err(_) => {
resolved_map.insert(event_id, Err("Failed to gather forward extremities".into()));
continue;
}
}
};
// Step 6. event passes auth based on state of all forks and current room state
let state_at_forks = if fork_states.is_empty() {
@ -803,19 +805,47 @@ pub async fn send_transaction_message_route<'a>(
} else if fork_states.len() == 1 {
fork_states[0].clone()
} else {
let auth_events = fork_states
.iter()
.map(|map| {
db.rooms
.auth_events_full(
pdu.room_id(),
&map.values()
.map(|pdu| pdu.event_id().clone())
.collect::<Vec<_>>(),
let mut auth_events = vec![];
// this keeps track if we error so we can break out of these inner loops
// to continue on with the incoming PDU's
let mut failed = false;
for map in &fork_states {
let mut state_auth = vec![];
for pdu in map.values() {
let event = match auth_cache.get(pdu.event_id()) {
Some(aev) => aev.clone(),
// We should know about every event at this point but just incase...
None => match fetch_events(
&db,
server_name,
&pub_key_map,
&[pdu.event_id().clone()],
&mut auth_cache,
)
.map(|pdus| pdus.into_iter().map(Arc::new).collect::<Vec<_>>())
})
.collect::<Result<Vec<_>>>()?;
.await
.map(|mut vec| vec.remove(0))
{
Ok(aev) => aev.clone(),
Err(_) => {
resolved_map.insert(
event_id.clone(),
Err("Event has been soft failed".into()),
);
failed = true;
break;
}
},
};
state_auth.push(event);
}
if failed {
break;
}
auth_events.push(state_auth);
}
if failed {
continue;
}
// Add everything we will need to event_map
event_map.extend(
@ -862,74 +892,163 @@ pub async fn send_transaction_message_route<'a>(
if !state_res::event_auth::auth_check(
&RoomVersionId::Version6,
&event,
&pdu,
previous,
&state_at_forks,
None,
)
.map_err(|_e| Error::Conflict("Auth check failed"))?
{
// Soft fail
// Soft fail, we add the event as an outlier.
resolved_map.insert(
event.event_id().clone(),
pdu.event_id().clone(),
Err("Event has been soft failed".into()),
);
} else {
append_state(&db, &pdu)?;
// Event has passed all auth/stateres checks
resolved_map.insert(event.event_id().clone(), Ok(()));
resolved_map.insert(pdu.event_id().clone(), Ok(()));
}
}
Ok(dbg!(send_transaction_message::v1::Response { pdus: resolved_map }).into())
}
async fn auth_each_event(
db: &Database,
/// Validate any event that is given to us by another server.
///
/// 1. Is a valid event, otherwise it is dropped (PduEvent deserialization satisfies this).
/// 2. Passes signature checks, otherwise event is dropped.
/// 3. Passes hash checks, otherwise it is redacted before being processed further.
/// 4. Passes auth_chain collection (we can gather the events that auth this event recursively).
/// 5. Once the event has passed all checks it can be added as an outlier to the DB.
fn validate_event<'a>(
db: &'a Database,
value: CanonicalJsonObject,
event_id: EventId,
pub_key_map: &PublicKeyMap,
server_name: &ServerName,
auth_cache: EventMap<Arc<PduEvent>>,
) -> std::result::Result<PduEvent, String> {
// Ruma/PduEvent satisfies - 1. Is a valid event, otherwise it is dropped.
// 2. Passes signature checks, otherwise event is dropped.
// 3. Passes hash checks, otherwise it is redacted before being processed further.
let mut val = signature_and_hash_check(&pub_key_map, value)?;
pub_key_map: &'a PublicKeyMap,
origin: &'a ServerName,
auth_cache: &'a mut EventMap<Arc<PduEvent>>,
) -> Pin<Box<dyn Future<Output = StdResult<PduEvent, String>> + 'a + Send>> {
Box::pin(async move {
let mut val = signature_and_hash_check(&pub_key_map, value)?;
// Now that we have checked the signature and hashes we can add the eventID and convert
// to our PduEvent type also finally verifying the first step listed above
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id).expect("EventId is a valid CanonicalJsonValue"),
);
let pdu = serde_json::from_value::<PduEvent>(
serde_json::to_value(val).expect("CanonicalJsonObj is a valid JsonValue"),
)
.map_err(|_| "Event is not a valid PDU".to_string())?;
// Now that we have checked the signature and hashes we can add the eventID and convert
// to our PduEvent type also finally verifying the first step listed above
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id).expect("EventId is a valid CanonicalJsonValue"),
);
let pdu = serde_json::from_value::<PduEvent>(
serde_json::to_value(val).expect("CanonicalJsonObj is a valid JsonValue"),
)
.map_err(|_| "Event is not a valid PDU".to_string())?;
// If we have no idea about this room skip the PDU
if !db.rooms.exists(&pdu.room_id).map_err(|e| e.to_string())? {
return Err("Room is unknown to this server".into());
}
fetch_check_auth_events(db, origin, pub_key_map, &pdu.auth_events, auth_cache)
.await
.map_err(|_| "Event failed auth chain check".to_string())?;
// Fetch any unknown prev_events or retrieve them from the DB
let previous = match fetch_events(&db, server_name, &pub_key_map, &pdu.prev_events).await {
Ok(mut evs) if evs.len() == 1 => Some(Arc::new(evs.remove(0))),
_ => None,
};
db.rooms
.append_pdu_outlier(pdu.event_id(), &pdu)
.map_err(|e| e.to_string())?;
// 4. Passes authorization rules based on the event's auth events, otherwise it is rejected.
// Recursively gather all auth events checking that the previous auth events are valid.
let auth_events: Vec<PduEvent> =
match fetch_check_auth_events(&db, server_name, &pub_key_map, &pdu.prev_events).await {
Ok(events) => events,
Err(_) => return Err("Failed to recursively gather auth events".into()),
};
Ok(pdu)
Ok(pdu)
})
}
/// Find the event and auth it.
///
/// 1. Look in the main timeline (pduid_pdu tree)
/// 2. Look at outlier pdu tree
/// 3. Ask origin server over federation
/// 4. TODO: Ask other servers over federation?
async fn fetch_events(
db: &Database,
origin: &ServerName,
key_map: &PublicKeyMap,
events: &[EventId],
auth_cache: &mut EventMap<Arc<PduEvent>>,
) -> Result<Vec<Arc<PduEvent>>> {
let mut pdus = vec![];
for id in events {
let pdu = match db.rooms.get_pdu(&id)? {
Some(pdu) => Arc::new(pdu),
None => match db.rooms.get_pdu_outlier(&id)? {
Some(pdu) => Arc::new(pdu),
None => match db
.sending
.send_federation_request(
&db.globals,
origin,
get_event::v1::Request { event_id: &id },
)
.await
{
Ok(res) => {
let (event_id, value) = crate::pdu::gen_event_id_canonical_json(&res.pdu);
let pdu = validate_event(db, value, event_id, key_map, origin, auth_cache)
.await
.map_err(|_| Error::Conflict("Authentication of event failed"))?;
Arc::new(pdu)
}
Err(_) => return Err(Error::BadServerResponse("Failed to fetch event")),
},
},
};
pdus.push(pdu);
}
Ok(pdus)
}
/// The check in `fetch_check_auth_events` is that a complete chain is found for the
/// events `auth_events`. If the chain is found to have any missing events it fails.
///
/// The `auth_cache` is filled instead of returning a `Vec`.
async fn fetch_check_auth_events(
db: &Database,
origin: &ServerName,
key_map: &PublicKeyMap,
event_ids: &[EventId],
auth_cache: &mut EventMap<Arc<PduEvent>>,
) -> Result<()> {
let mut stack = event_ids.to_vec();
// DFS for auth event chain
while !stack.is_empty() {
let ev_id = stack.pop().unwrap();
if auth_cache.contains_key(&ev_id) {
continue;
}
let ev = fetch_events(db, origin, key_map, &[ev_id.clone()], auth_cache)
.await
.map(|mut vec| vec.remove(0))?;
stack.extend(ev.auth_events());
auth_cache.insert(ev.event_id().clone(), ev);
}
Ok(())
}
/// Search the DB for the signing keys of the given server, if we don't have them
/// fetch them from the server and save to our DB.
async fn fetch_signing_keys(
db: &Database,
origin: &ServerName,
) -> Result<BTreeMap<ServerSigningKeyId, VerifyKey>> {
match db.globals.signing_keys_for(origin)? {
keys if !keys.is_empty() => Ok(keys),
_ => {
let keys = db
.sending
.send_federation_request(&db.globals, origin, get_server_keys::v2::Request::new())
.await
.map_err(|_| Error::BadServerResponse("Failed to request server keys"))?;
db.globals.add_signing_key(origin, &keys.server_key)?;
Ok(keys.server_key.verify_keys)
}
}
}
fn signature_and_hash_check(
pub_key_map: &ruma::signatures::PublicKeyMap,
value: CanonicalJsonObject,
@ -954,122 +1073,29 @@ fn signature_and_hash_check(
)
}
/// The check in `fetch_check_auth_events` is that a complete chain is found for the
/// events `auth_events`. If the chain is found to have missing events it fails.
async fn fetch_check_auth_events(
db: &Database,
origin: &ServerName,
key_map: &PublicKeyMap,
event_ids: &[EventId],
) -> Result<Vec<PduEvent>> {
let mut result = BTreeMap::new();
let mut stack = event_ids.to_vec();
fn forward_extremity_ids(db: &Database, pdu: &PduEvent) -> Result<Vec<StateMap<Arc<PduEvent>>>> {
let mut fork_states = vec![];
for id in &db.rooms.get_pdu_leaves(pdu.room_id())? {
if let Some(id) = db.rooms.get_pdu_id(id)? {
let state_hash = db
.rooms
.pdu_state_hash(&id)?
.expect("found pdu with no statehash");
let state = db
.rooms
.state_full(&pdu.room_id, &state_hash)?
.into_iter()
.map(|(k, v)| ((k.0, Some(k.1)), Arc::new(v)))
.collect();
// DFS for auth event chain
while !stack.is_empty() {
let ev_id = stack.pop().unwrap();
if result.contains_key(&ev_id) {
continue;
}
let ev = match db.rooms.get_pdu(&ev_id)? {
Some(pdu) => pdu,
None => match db
.sending
.send_federation_request(
&db.globals,
origin,
get_event::v1::Request { event_id: &ev_id },
)
.await
{
Ok(res) => {
let (event_id, value) = crate::pdu::gen_event_id_canonical_json(&res.pdu);
match signature_and_hash_check(key_map, value) {
Ok(mut val) => {
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id)
.expect("EventId is a valid CanonicalJsonValue"),
);
serde_json::from_value::<PduEvent>(
serde_json::to_value(val)
.expect("CanonicalJsonObj is a valid JsonValue"),
)
.expect("Pdu is valid Canonical JSON Map")
}
Err(e) => {
// TODO: I would assume we just keep going
error!("{:?}", e);
continue;
}
}
}
Err(_) => return Err(Error::BadServerResponse("Failed to fetch event")),
},
};
stack.extend(ev.auth_events());
result.insert(ev.event_id().clone(), ev);
}
Ok(result.into_iter().map(|(_, v)| v).collect())
}
/// TODO: this needs to add events to the DB in a way that does not
/// effect the state of the room
async fn fetch_events(
db: &Database,
origin: &ServerName,
key_map: &PublicKeyMap,
events: &[EventId],
) -> Result<Vec<PduEvent>> {
let mut pdus = vec![];
for id in events {
match db.rooms.get_pdu(id)? {
Some(pdu) => pdus.push(pdu),
None => match db
.sending
.send_federation_request(
&db.globals,
origin,
get_event::v1::Request { event_id: id },
)
.await
{
Ok(res) => {
let (event_id, value) = crate::pdu::gen_event_id_canonical_json(&res.pdu);
match signature_and_hash_check(key_map, value) {
Ok(mut val) => {
// TODO: add to our DB somehow?
val.insert(
"event_id".to_owned(),
to_canonical_value(&event_id)
.expect("EventId is a valid CanonicalJsonValue"),
);
let pdu = serde_json::from_value::<PduEvent>(
serde_json::to_value(val)
.expect("CanonicalJsonObj is a valid JsonValue"),
)
.expect("Pdu is valid Canonical JSON Map");
pdus.push(pdu);
}
Err(e) => {
// TODO: I would assume we just keep going
error!("{:?}", e);
continue;
}
}
}
Err(_) => return Err(Error::BadServerResponse("Failed to fetch event")),
},
fork_states.push(state);
} else {
return Err(Error::Conflict(
"we don't know of a pdu that is part of our known forks OOPS",
));
}
}
Ok(pdus)
}
fn forward_extremity_ids(db: &Database, room_id: &RoomId) -> Result<Vec<EventId>> {
db.rooms.get_pdu_leaves(room_id)
Ok(fork_states)
}
fn append_state(db: &Database, pdu: &PduEvent) -> Result<()> {
@ -1078,9 +1104,12 @@ fn append_state(db: &Database, pdu: &PduEvent) -> Result<()> {
pdu_id.push(0xff);
pdu_id.extend_from_slice(&count.to_be_bytes());
db.rooms.append_to_state(&pdu_id, pdu, &db.globals)?;
// We append to state before appending the pdu, so we don't have a moment in time with the
// pdu without it's state. This is okay because append_pdu can't fail.
let statehashid = db.rooms.append_to_state(&pdu_id, &pdu, &db.globals)?;
db.rooms.append_pdu(
pdu,
&pdu,
utils::to_canonical_object(pdu).expect("Pdu is valid canonical object"),
count,
pdu_id.clone().into(),
@ -1089,78 +1118,9 @@ fn append_state(db: &Database, pdu: &PduEvent) -> Result<()> {
&db.admin,
)?;
for appservice in db.appservice.iter_all().filter_map(|r| r.ok()) {
db.sending.send_pdu_appservice(&appservice.0, &pdu_id)?;
}
Ok(())
}
/// TODO: This should not write to the current room state (roomid_statehash)
fn append_state_soft(db: &Database, pdu: &PduEvent) -> Result<()> {
let count = db.globals.next_count()?;
let mut pdu_id = pdu.room_id.as_bytes().to_vec();
pdu_id.push(0xff);
pdu_id.extend_from_slice(&count.to_be_bytes());
// db.rooms.append_pdu(
// pdu,
// &utils::to_canonical_object(pdu).expect("Pdu is valid canonical object"),
// count,
// pdu_id.clone().into(),
// &db.globals,
// &db.account_data,
// &db.admin,
// )?;
Ok(())
}
fn forward_extremity_ids(db: &Database, room_id: &RoomId) -> Result<Vec<EventId>> {
todo!()
}
fn append_state(db: &Database, pdu: &PduEvent) -> Result<()> {
let count = db.globals.next_count()?;
let mut pdu_id = pdu.room_id.as_bytes().to_vec();
pdu_id.push(0xff);
pdu_id.extend_from_slice(&count.to_be_bytes());
db.rooms.append_to_state(&pdu_id, pdu, &db.globals)?;
db.rooms.append_pdu(
pdu,
&utils::to_canonical_object(pdu).expect("Pdu is valid canonical object"),
count,
pdu_id.clone().into(),
&db.globals,
&db.account_data,
&db.admin,
)?;
for appservice in db.appservice.iter_all().filter_map(|r| r.ok()) {
db.sending.send_pdu_appservice(&appservice.0, &pdu_id)?;
}
Ok(())
}
/// TODO: This should not write to the current room state (roomid_statehash)
fn append_state_soft(db: &Database, pdu: &PduEvent) -> Result<()> {
let count = db.globals.next_count()?;
let mut pdu_id = pdu.room_id.as_bytes().to_vec();
pdu_id.push(0xff);
pdu_id.extend_from_slice(&count.to_be_bytes());
db.rooms.append_to_state(&pdu_id, pdu, &db.globals)?;
db.rooms.append_pdu(
pdu,
&utils::to_canonical_object(pdu).expect("Pdu is valid canonical object"),
count,
pdu_id.clone().into(),
&db.globals,
&db.account_data,
&db.admin,
)?;
// We set the room state after inserting the pdu, so that we never have a moment in time
// where events in the current room state do not exist
db.rooms.set_room_state(&pdu.room_id, &statehashid)?;
for appservice in db.appservice.iter_all().filter_map(|r| r.ok()) {
db.sending.send_pdu_appservice(&appservice.0, &pdu_id)?;