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improvement: check signatures on join

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This commit is contained in:
Timo Kösters 2021-04-13 18:17:51 +02:00
parent b4f79b77ba
commit 5049d0e01b
No known key found for this signature in database
GPG key ID: 24DA7517711A2BA4
2 changed files with 94 additions and 121 deletions
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100
src/client_server/membership.rs
View file

@ -2,7 +2,7 @@ use super::State;
use crate::{
client_server,
pdu::{PduBuilder, PduEvent},
utils, ConduitResult, Database, Error, Result, Ruma,
server_server, utils, ConduitResult, Database, Error, Result, Ruma,
};
use log::{error, warn};
use ruma::{
@ -21,7 +21,7 @@ use ruma::{
serde::{to_canonical_value, CanonicalJsonObject, Raw},
EventId, RoomId, RoomVersionId, ServerName, UserId,
};
use std::{collections::BTreeMap, convert::TryFrom, sync::Arc};
use std::{collections::BTreeMap, convert::TryFrom};
#[cfg(feature = "conduit_bin")]
use rocket::{get, post};
@ -515,27 +515,6 @@ async fn join_room_by_id_helper(
)
.await?;
let add_event_id = |pdu: &Raw<Pdu>| -> Result<(EventId, CanonicalJsonObject)> {
let mut value = serde_json::from_str(pdu.json().get()).map_err(|e| {
error!("{:?}: {:?}", pdu, e);
Error::BadServerResponse("Invalid PDU in server response")
})?;
let event_id = EventId::try_from(&*format!(
"${}",
ruma::signatures::reference_hash(&value, &room_version)
.expect("ruma can calculate reference hashes")
))
.expect("ruma's reference hashes are valid event ids");
value.insert(
"event_id".to_owned(),
to_canonical_value(&event_id)
.expect("a valid EventId can be converted to CanonicalJsonValue"),
);
Ok((event_id, value))
};
let count = db.globals.next_count()?;
let mut pdu_id = room_id.as_bytes().to_vec();
@ -546,23 +525,15 @@ async fn join_room_by_id_helper(
.map_err(|_| Error::BadServerResponse("Invalid PDU in send_join response."))?;
let mut state = BTreeMap::new();
let mut pub_key_map = BTreeMap::new();
for pdu in send_join_response.room_state.state.iter() {
let (event_id, value) = validate_and_add_event_id(pdu, &room_version, &mut pub_key_map, &db).await?;
let pdu = PduEvent::from_id_val(&event_id, value.clone()).map_err(|e| {
warn!("{:?}: {}", value, e);
Error::BadServerResponse("Invalid PDU in send_join response.")
})?;
for pdu in send_join_response
.room_state
.state
.iter()
.map(add_event_id)
.map(|r| {
let (event_id, value) = r?;
PduEvent::from_id_val(&event_id, value.clone())
.map(|ev| (event_id, Arc::new(ev)))
.map_err(|e| {
warn!("{:?}: {}", value, e);
Error::BadServerResponse("Invalid PDU in send_join response.")
})
})
{
let (_id, pdu) = pdu?;
db.rooms.add_pdu_outlier(&pdu)?;
if let Some(state_key) = &pdu.state_key {
if pdu.kind == EventType::RoomMember {
@ -612,22 +583,12 @@ async fn join_room_by_id_helper(
db.rooms.force_state(room_id, state, &db.globals)?;
for pdu in send_join_response
.room_state
.auth_chain
.iter()
.map(add_event_id)
.map(|r| {
let (event_id, value) = r?;
PduEvent::from_id_val(&event_id, value.clone())
.map(|ev| (event_id, Arc::new(ev)))
.map_err(|e| {
warn!("{:?}: {}", value, e);
Error::BadServerResponse("Invalid PDU in send_join response.")
})
})
{
let (_id, pdu) = pdu?;
for pdu in send_join_response.room_state.auth_chain.iter() {
let (event_id, value) = validate_and_add_event_id(pdu, &room_version, &mut pub_key_map, &db).await?;
let pdu = PduEvent::from_id_val(&event_id, value.clone()).map_err(|e| {
warn!("{:?}: {}", value, e);
Error::BadServerResponse("Invalid PDU in send_join response.")
})?;
db.rooms.add_pdu_outlier(&pdu)?;
}
@ -674,3 +635,32 @@ async fn join_room_by_id_helper(
Ok(join_room_by_id::Response::new(room_id.clone()).into())
}
async fn validate_and_add_event_id(
pdu: &Raw<Pdu>,
room_version: &RoomVersionId,
pub_key_map: &mut BTreeMap<String, BTreeMap<String, String>>,
db: &Database,
) -> Result<(EventId, CanonicalJsonObject)> {
let mut value = serde_json::from_str::<CanonicalJsonObject>(pdu.json().get()).map_err(|e| {
error!("{:?}: {:?}", pdu, e);
Error::BadServerResponse("Invalid PDU in server response")
})?;
server_server::fetch_required_signing_keys(&value, pub_key_map, db).await?;
let event_id = EventId::try_from(&*format!(
"${}",
ruma::signatures::reference_hash(&value, &room_version)
.expect("ruma can calculate reference hashes")
))
.expect("ruma's reference hashes are valid event ids");
value.insert(
"event_id".to_owned(),
to_canonical_value(&event_id)
.expect("a valid EventId can be converted to CanonicalJsonValue"),
);
Ok((event_id, value))
}

115
src/server_server.rs
View file

@ -658,44 +658,7 @@ fn handle_incoming_pdu<'a>(
// We go through all the signatures we see on the value and fetch the corresponding signing
// keys
for (signature_server, signature) in match value
.get("signatures")
.ok_or_else(|| "No signatures in server response pdu.".to_string())?
{
CanonicalJsonValue::Object(map) => map,
_ => return Err("Invalid signatures object in server response pdu.".to_string()),
} {
let signature_object = match signature {
CanonicalJsonValue::Object(map) => map,
_ => {
return Err(
"Invalid signatures content object in server response pdu.".to_string()
)
}
};
let signature_ids = signature_object.keys().collect::<Vec<_>>();
debug!("Fetching signing keys for {}", signature_server);
let keys = match fetch_signing_keys(
&db,
&Box::<ServerName>::try_from(&**signature_server).map_err(|_| {
"Invalid servername in signatures of server response pdu.".to_string()
})?,
signature_ids,
)
.await
{
Ok(keys) => keys,
Err(_) => {
return Err(
"Signature verification failed: Could not fetch signing key.".to_string(),
);
}
};
pub_key_map.insert(signature_server.clone(), keys);
}
fetch_required_signing_keys(&value, pub_key_map, db).await.map_err(|e| e.to_string())?;
// 2. Check signatures, otherwise drop
// 3. check content hash, redact if doesn't match
@ -1639,38 +1602,58 @@ pub fn get_profile_information_route<'a>(
.into())
}
/*
#[cfg_attr(
feature = "conduit_bin",
get("/_matrix/federation/v2/invite/<_>/<_>", data = "<body>")
)]
pub fn get_user_devices_route<'a>(
db: State<'a, Database>,
body: Ruma<membership::v1::Request<'_>>,
) -> ConduitResult<get_profile_information::v1::Response> {
if !db.globals.allow_federation() {
return Err(Error::bad_config("Federation is disabled."));
}
let mut displayname = None;
let mut avatar_url = None;
match body.field {
Some(ProfileField::DisplayName) => displayname = db.users.displayname(&body.user_id)?,
Some(ProfileField::AvatarUrl) => avatar_url = db.users.avatar_url(&body.user_id)?,
None => {
displayname = db.users.displayname(&body.user_id)?;
avatar_url = db.users.avatar_url(&body.user_id)?;
pub async fn fetch_required_signing_keys(
event: &BTreeMap<String, CanonicalJsonValue>,
pub_key_map: &mut BTreeMap<String, BTreeMap<String, String>>,
db: &Database,
) -> Result<()> {
// We go through all the signatures we see on the value and fetch the corresponding signing
// keys
for (signature_server, signature) in match event
.get("signatures")
.ok_or_else(|| Error::BadServerResponse("No signatures in server response pdu."))?
{
CanonicalJsonValue::Object(map) => map,
_ => {
return Err(Error::BadServerResponse(
"Invalid signatures object in server response pdu.",
))
}
} {
let signature_object = match signature {
CanonicalJsonValue::Object(map) => map,
_ => {
return Err(Error::BadServerResponse(
"Invalid signatures content object in server response pdu.",
))
}
};
let signature_ids = signature_object.keys().collect::<Vec<_>>();
debug!("Fetching signing keys for {}", signature_server);
let keys = match fetch_signing_keys(
db,
&Box::<ServerName>::try_from(&**signature_server).map_err(|_| {
Error::BadServerResponse("Invalid servername in signatures of server response pdu.")
})?,
signature_ids,
)
.await
{
Ok(keys) => keys,
Err(_) => {
return Err(Error::BadServerResponse(
"Signature verification failed: Could not fetch signing key.",
));
}
};
pub_key_map.insert(signature_server.clone(), keys);
}
Ok(get_profile_information::v1::Response {
displayname,
avatar_url,
}
.into())
Ok(())
}
*/
#[cfg(test)]
mod tests {