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use std::{convert::TryFrom, sync::Arc};
use js_int::int;
use maplit::btreeset;
use ruma_events::{
room::{
create::CreateEventContent,
join_rules::{JoinRule, JoinRulesEventContent},
member::{MembershipState, ThirdPartyInvite},
power_levels::PowerLevelsEventContent,
third_party_invite::ThirdPartyInviteEventContent,
},
EventType,
};
use ruma_identifiers::{RoomVersionId, UserId};
use tracing::{debug, info, warn};
use crate::{room_version::RoomVersion, Error, Event, Result, StateMap};
pub fn auth_types_for_event(
kind: &EventType,
sender: &UserId,
state_key: Option<String>,
content: serde_json::Value,
) -> Vec<(EventType, String)> {
if kind == &EventType::RoomCreate {
return vec![];
}
let mut auth_types = vec![
(EventType::RoomPowerLevels, "".to_owned()),
(EventType::RoomMember, sender.to_string()),
(EventType::RoomCreate, "".to_owned()),
];
if kind == &EventType::RoomMember {
if let Some(state_key) = state_key {
if let Some(Ok(membership)) = content
.get("membership")
.map(|m| serde_json::from_value::<MembershipState>(m.clone()))
{
if [MembershipState::Join, MembershipState::Invite].contains(&membership) {
let key = (EventType::RoomJoinRules, "".to_owned());
if !auth_types.contains(&key) {
auth_types.push(key)
}
}
let key = (EventType::RoomMember, state_key);
if !auth_types.contains(&key) {
auth_types.push(key)
}
if membership == MembershipState::Invite {
if let Some(Ok(t_id)) = content
.get("third_party_invite")
.map(|t| serde_json::from_value::<ThirdPartyInvite>(t.clone()))
{
let key = (EventType::RoomThirdPartyInvite, t_id.signed.token);
if !auth_types.contains(&key) {
auth_types.push(key)
}
}
}
}
}
}
auth_types
}
pub fn auth_check<E, F>(
room_version: &RoomVersion,
incoming_event: &Arc<E>,
prev_event: Option<Arc<E>>,
current_third_party_invite: Option<Arc<E>>,
fetch_state: F,
) -> Result<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
info!("auth_check beginning for {} ({})", incoming_event.event_id(), incoming_event.kind());
if incoming_event.kind() == EventType::RoomCreate {
info!("start m.room.create check");
if !incoming_event.prev_events().is_empty() {
warn!("the room creation event had previous events");
return Ok(false);
}
if incoming_event.room_id().server_name() != incoming_event.sender().server_name() {
warn!("creation events server does not match sender");
return Ok(false);
}
if serde_json::from_value::<RoomVersionId>(
incoming_event
.content()
.get("room_version")
.cloned()
.unwrap_or_else(|| serde_json::json!("1")),
)
.is_err()
{
warn!("invalid room version found in m.room.create event");
return Ok(false);
}
if incoming_event.content().get("creator").is_none() {
warn!("no creator field found in room create content");
return Ok(false);
}
info!("m.room.create event was allowed");
return Ok(true);
}
if fetch_state(&EventType::RoomCreate, "").is_none() {
warn!("no m.room.create event in auth chain");
return Ok(false);
}
if incoming_event.kind() == EventType::RoomAliases && room_version.special_case_aliases_auth {
info!("starting m.room.aliases check");
if incoming_event.state_key() != Some(incoming_event.sender().server_name().to_string()) {
warn!("state_key does not match sender");
return Ok(false);
}
info!("m.room.aliases event was allowed");
return Ok(true);
}
if incoming_event.kind() == EventType::RoomMember {
info!("starting m.room.member check");
let state_key = match incoming_event.state_key() {
None => {
warn!("no statekey in member event");
return Ok(false);
}
Some(s) => s,
};
let membership = incoming_event
.content()
.get("membership")
.map(|m| serde_json::from_value::<MembershipState>(m.clone()));
if !matches!(membership, Some(Ok(_))) {
warn!("no valid membership field found for m.room.member event content");
return Ok(false);
}
if !valid_membership_change(
&state_key,
incoming_event.sender(),
incoming_event.content(),
prev_event,
current_third_party_invite,
fetch_state,
)? {
return Ok(false);
}
info!("m.room.member event was allowed");
return Ok(true);
}
match check_event_sender_in_room(incoming_event.sender(), &fetch_state) {
Some(true) => {}
Some(false) => {
warn!("sender's membership is not join");
return Ok(false);
}
None => {
warn!("sender not found in room");
return Ok(false);
}
}
if incoming_event.kind() == EventType::RoomThirdPartyInvite
&& !can_send_invite(incoming_event, &fetch_state)?
{
warn!("sender's cannot send invites in this room");
return Ok(false);
}
if !can_send_event(incoming_event, &fetch_state) {
warn!("user cannot send event");
return Ok(false);
}
if incoming_event.kind() == EventType::RoomPowerLevels {
info!("starting m.room.power_levels check");
if let Some(required_pwr_lvl) =
check_power_levels(room_version, incoming_event, &fetch_state)
{
if !required_pwr_lvl {
warn!("power level was not allowed");
return Ok(false);
}
} else {
warn!("power level was not allowed");
return Ok(false);
}
info!("power levels event allowed");
}
if room_version.extra_redaction_checks
&& incoming_event.kind() == EventType::RoomRedaction
&& !check_redaction(room_version, incoming_event, &fetch_state)?
{
return Ok(false);
}
info!("allowing event passed all checks");
Ok(true)
}
pub fn valid_membership_change<E, F>(
state_key: &str,
user_sender: &UserId,
content: serde_json::Value,
prev_event: Option<Arc<E>>,
current_third_party_invite: Option<Arc<E>>,
fetch_state: F,
) -> Result<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let target_membership = serde_json::from_value::<MembershipState>(
content.get("membership").expect("we test before that this field exists").clone(),
)?;
let third_party_invite = content
.get("third_party_invite")
.map(|t| serde_json::from_value::<ThirdPartyInvite>(t.clone()));
let target_user_id =
UserId::try_from(state_key).map_err(|e| Error::InvalidPdu(format!("{}", e)))?;
let sender = fetch_state(&EventType::RoomMember, user_sender.as_str());
let sender = sender.as_ref();
let sender_membership = sender.map_or(Ok::<_, Error>(MembershipState::Leave), |pdu| {
Ok(serde_json::from_value::<MembershipState>(
pdu.content().get("membership").expect("we assume existing events are valid").clone(),
)?)
})?;
let current = fetch_state(&EventType::RoomMember, target_user_id.as_str());
let current = current.as_ref();
let current_membership = current.map_or(Ok::<_, Error>(MembershipState::Leave), |pdu| {
Ok(serde_json::from_value::<MembershipState>(
pdu.content().get("membership").expect("we assume existing events are valid").clone(),
)?)
})?;
let power_levels_event = fetch_state(&EventType::RoomPowerLevels, "");
let power_levels_event = power_levels_event.as_ref();
let power_levels = power_levels_event.map_or_else(
|| Ok::<_, Error>(PowerLevelsEventContent::default()),
|power_levels| {
serde_json::from_value::<PowerLevelsEventContent>(power_levels.content())
.map_err(Into::into)
},
)?;
let sender_power = power_levels.users.get(user_sender).map_or_else(
|| (sender_membership == MembershipState::Join).then(|| &power_levels.users_default),
Some,
);
let target_power = power_levels.users.get(&target_user_id).map_or_else(
|| (target_membership == MembershipState::Join).then(|| &power_levels.users_default),
Some,
);
let join_rules_event = fetch_state(&EventType::RoomJoinRules, "");
let join_rules_event = join_rules_event.as_ref();
let mut join_rules = JoinRule::Invite;
if let Some(jr) = join_rules_event {
join_rules = serde_json::from_value::<JoinRulesEventContent>(jr.content())?.join_rule;
}
if let Some(prev) = prev_event {
if prev.kind() == EventType::RoomCreate && prev.prev_events().is_empty() {
return Ok(true);
}
}
Ok(if target_membership == MembershipState::Join {
if user_sender != &target_user_id {
warn!("Can't make other user join");
false
} else if let MembershipState::Ban = current_membership {
warn!(
"Banned user can't join\nCurrent user state: {:?}",
current.map(|e| e.event_id())
);
false
} else {
let allow = join_rules == JoinRule::Invite
&& (current_membership == MembershipState::Join
|| current_membership == MembershipState::Invite)
|| join_rules == JoinRule::Public;
if !allow {
warn!("Can't join if join rules is not public and user is not invited/joined\nJoin Rules: {:?}\nCurrent user state: {:?}",
join_rules_event.map(|e| e.event_id()),
current.map(|e| e.event_id()));
}
allow
}
} else if target_membership == MembershipState::Invite {
if let Some(Ok(tp_id)) = third_party_invite {
if current_membership == MembershipState::Ban {
warn!(
"Can't invite banned user\nCurrent user state: {:?}",
current.map(|e| e.event_id())
);
false
} else {
let allow = verify_third_party_invite(
Some(state_key),
user_sender,
&tp_id,
current_third_party_invite,
);
if !allow {
warn!("Third party invite invalid");
}
allow
}
} else if sender_membership != MembershipState::Join
|| current_membership == MembershipState::Join
|| current_membership == MembershipState::Ban
{
warn!(
"Can't invite user if sender not joined or the user is currently joined or banned\nCurrent user state: {:?}\nSender user state: {:?}",
current.map(|e| e.event_id()),
sender.map(|e| e.event_id())
);
false
} else {
let allow = sender_power.filter(|&p| p >= &power_levels.invite).is_some();
if !allow {
warn!("User does not have enough power to invite\nCurrent user state: {:?}\nPower levels: {:?}",
current.map(|e| e.event_id()),
power_levels_event.map(|e| e.event_id())
);
}
allow
}
} else if target_membership == MembershipState::Leave {
if user_sender == &target_user_id {
let allow = current_membership == MembershipState::Join
|| current_membership == MembershipState::Invite;
if !allow {
warn!(
"Can't leave if not invited or joined\nCurrent user state: {:?}",
current.map(|e| e.event_id()),
);
}
allow
} else if sender_membership != MembershipState::Join
|| current_membership == MembershipState::Ban
&& sender_power.filter(|&p| p < &power_levels.ban).is_some()
{
warn!("Can't kick if sender not joined or user is already banned\nCurrent user state: {:?}\nSender user state: {:?}",
current.map(|e| e.event_id()),
sender.map(|e| e.event_id())
);
false
} else {
let allow = sender_power.filter(|&p| p >= &power_levels.kick).is_some()
&& target_power < sender_power;
if !allow {
warn!("User does not have enough power to kick\nCurrent user state: {:?}\nPower levels: {:?}",
current.map(|e| e.event_id()),
power_levels_event.map(|e| e.event_id())
);
}
allow
}
} else if target_membership == MembershipState::Ban {
if sender_membership != MembershipState::Join {
warn!(
"Can't ban user if sender is not joined\nSender user state: {:?}",
sender.map(|e| e.event_id())
);
false
} else {
let allow = sender_power.filter(|&p| p >= &power_levels.ban).is_some()
&& target_power < sender_power;
if !allow {
warn!("User does not have enough power to ban\nCurrent user state: {:?}\nPower levels: {:?}",
current.map(|e| e.event_id()),
power_levels_event.map(|e| e.event_id())
);
}
allow
}
} else {
warn!("Unknown membership transition");
false
})
}
pub fn check_event_sender_in_room<E, F>(sender: &UserId, fetch_state: F) -> Option<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let mem = fetch_state(&EventType::RoomMember, sender.as_str())?;
let membership = serde_json::from_value::<MembershipState>(
mem.content()
.get("membership")
.expect("we should test before that this field exists")
.clone(),
)
.ok()?;
Some(membership == MembershipState::Join)
}
pub fn can_send_event<E, F>(event: &Arc<E>, fetch_state: F) -> bool
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let ple = fetch_state(&EventType::RoomPowerLevels, "");
let event_type_power_level = get_send_level(&event.kind(), event.state_key(), ple.as_ref());
let user_level = get_user_power_level(event.sender(), fetch_state);
debug!("{} ev_type {} usr {}", event.event_id(), event_type_power_level, user_level);
if user_level < event_type_power_level {
return false;
}
if event.state_key().as_ref().map_or(false, |k| k.starts_with('@'))
&& event.state_key().as_deref() != Some(event.sender().as_str())
{
return false;
}
true
}
pub fn check_power_levels<E, F>(
room_version: &RoomVersion,
power_event: &Arc<E>,
fetch_state: F,
) -> Option<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let power_event_state_key = power_event.state_key().expect("power events have state keys");
let current_state =
if let Some(current_state) = fetch_state(&power_event.kind(), &power_event_state_key) {
current_state
} else {
return Some(true);
};
let user_content =
serde_json::from_value::<PowerLevelsEventContent>(power_event.content()).unwrap();
let current_content =
serde_json::from_value::<PowerLevelsEventContent>(current_state.content()).unwrap();
info!("validation of power event finished");
let user_level = get_user_power_level(power_event.sender(), fetch_state);
let mut user_levels_to_check = btreeset![];
let old_list = ¤t_content.users;
let user_list = &user_content.users;
for user in old_list.keys().chain(user_list.keys()) {
let user: &UserId = user;
user_levels_to_check.insert(user);
}
debug!("users to check {:?}", user_levels_to_check);
let mut event_levels_to_check = btreeset![];
let old_list = ¤t_content.events;
let new_list = &user_content.events;
for ev_id in old_list.keys().chain(new_list.keys()) {
let ev_id: &EventType = ev_id;
event_levels_to_check.insert(ev_id);
}
debug!("events to check {:?}", event_levels_to_check);
let old_state = ¤t_content;
let new_state = &user_content;
for user in user_levels_to_check {
let old_level = old_state.users.get(user);
let new_level = new_state.users.get(user);
if old_level.is_some() && new_level.is_some() && old_level == new_level {
continue;
}
if user != power_event.sender() && old_level.map(|int| (*int).into()) == Some(user_level) {
warn!("m.room.power_level cannot remove ops == to own");
return Some(false);
}
let old_level_too_big = old_level.map(|int| (*int).into()) > Some(user_level);
let new_level_too_big = new_level.map(|int| (*int).into()) > Some(user_level);
if old_level_too_big || new_level_too_big {
warn!("m.room.power_level failed to add ops > than own");
return Some(false);
}
}
for ev_type in event_levels_to_check {
let old_level = old_state.events.get(ev_type);
let new_level = new_state.events.get(ev_type);
if old_level.is_some() && new_level.is_some() && old_level == new_level {
continue;
}
let old_level_too_big = old_level.map(|int| (*int).into()) > Some(user_level);
let new_level_too_big = new_level.map(|int| (*int).into()) > Some(user_level);
if old_level_too_big || new_level_too_big {
warn!("m.room.power_level failed to add ops > than own");
return Some(false);
}
}
if room_version.limit_notifications_power_levels {
let old_level = old_state.notifications.room;
let new_level = new_state.notifications.room;
if old_level != new_level {
let old_level_too_big = i64::from(old_level) > user_level;
let new_level_too_big = i64::from(new_level) > user_level;
if old_level_too_big || new_level_too_big {
warn!("m.room.power_level failed to add ops > than own");
return Some(false);
}
}
}
let levels =
["users_default", "events_default", "state_default", "ban", "redact", "kick", "invite"];
let old_state = serde_json::to_value(old_state).unwrap();
let new_state = serde_json::to_value(new_state).unwrap();
for lvl_name in &levels {
if let Some((old_lvl, new_lvl)) = get_deserialize_levels(&old_state, &new_state, lvl_name) {
let old_level_too_big = old_lvl > user_level;
let new_level_too_big = new_lvl > user_level;
if old_level_too_big || new_level_too_big {
warn!("cannot add ops > than own");
return Some(false);
}
}
}
Some(true)
}
fn get_deserialize_levels(
old: &serde_json::Value,
new: &serde_json::Value,
name: &str,
) -> Option<(i64, i64)> {
Some((
serde_json::from_value(old.get(name)?.clone()).ok()?,
serde_json::from_value(new.get(name)?.clone()).ok()?,
))
}
pub fn check_redaction<E, F>(
_room_version: &RoomVersion,
redaction_event: &Arc<E>,
fetch_state: F,
) -> Result<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let user_level = get_user_power_level(redaction_event.sender(), &fetch_state);
let redact_level = get_named_level(fetch_state, "redact", 50);
if user_level >= redact_level {
info!("redaction allowed via power levels");
return Ok(true);
}
if redaction_event.event_id().server_name()
== redaction_event.redacts().as_ref().and_then(|id| id.server_name())
{
info!("redaction event allowed via room version 1 rules");
return Ok(true);
}
Ok(false)
}
pub fn check_membership<E: Event>(member_event: Option<Arc<E>>, state: MembershipState) -> bool {
if let Some(event) = member_event {
if let Some(Ok(membership)) = event
.content()
.get("membership")
.map(|m| serde_json::from_value::<MembershipState>(m.clone()))
{
membership == state
} else {
false
}
} else {
false
}
}
pub fn can_federate<E: Event>(auth_events: &StateMap<Arc<E>>) -> bool {
let creation_event = auth_events.get(&(EventType::RoomCreate, "".into()));
if let Some(ev) = creation_event {
if let Some(fed) = ev.content().get("m.federate") {
fed == "true"
} else {
false
}
} else {
false
}
}
pub fn get_named_level<E, F>(fetch_state: F, name: &str, default: i64) -> i64
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let power_level_event = fetch_state(&EventType::RoomPowerLevels, "");
if let Some(pl) = power_level_event {
if let Some(level) = pl.content().get(name) {
level.to_string().parse().unwrap_or(default)
} else {
0
}
} else {
default
}
}
pub fn get_user_power_level<E, F>(user_id: &UserId, fetch_state: F) -> i64
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
if let Some(pl) = fetch_state(&EventType::RoomPowerLevels, "") {
if let Ok(content) = serde_json::from_value::<PowerLevelsEventContent>(pl.content()) {
if let Some(level) = content.users.get(user_id) {
(*level).into()
} else {
content.users_default.into()
}
} else {
0
}
} else {
fetch_state(&EventType::RoomCreate, "")
.and_then(|create| serde_json::from_value::<CreateEventContent>(create.content()).ok())
.and_then(|create| (create.creator == *user_id).then(|| 100))
.unwrap_or_default()
}
}
pub fn get_send_level<E: Event>(
e_type: &EventType,
state_key: Option<String>,
power_lvl: Option<&Arc<E>>,
) -> i64 {
power_lvl
.and_then(|ple| {
serde_json::from_value::<PowerLevelsEventContent>(ple.content())
.map(|content| {
content.events.get(e_type).copied().unwrap_or_else(|| {
if state_key.is_some() {
content.state_default
} else {
content.events_default
}
})
})
.ok()
})
.map(i64::from)
.unwrap_or_else(|| if state_key.is_some() { 50 } else { 0 })
}
pub fn can_send_invite<E, F>(event: &Arc<E>, fetch_state: F) -> Result<bool>
where
E: Event,
F: Fn(&EventType, &str) -> Option<Arc<E>>,
{
let user_level = get_user_power_level(event.sender(), &fetch_state);
let invite_level = fetch_state(&EventType::RoomPowerLevels, "")
.map_or_else(
|| Ok::<_, Error>(int!(50)),
|power_levels| {
serde_json::from_value::<PowerLevelsEventContent>(power_levels.content())
.map(|pl| pl.invite)
.map_err(Into::into)
},
)?
.into();
Ok(user_level >= invite_level)
}
pub fn verify_third_party_invite<E: Event>(
user_state_key: Option<&str>,
sender: &UserId,
tp_id: &ThirdPartyInvite,
current_third_party_invite: Option<Arc<E>>,
) -> bool {
if user_state_key != Some(tp_id.signed.mxid.as_str()) {
return false;
}
if let Some(current_tpid) = current_third_party_invite {
if current_tpid.state_key().as_ref() != Some(&tp_id.signed.token) {
return false;
}
if sender != current_tpid.sender() {
return false;
}
if let Ok(tpid_ev) =
serde_json::from_value::<ThirdPartyInviteEventContent>(current_tpid.content())
{
for key in tpid_ev.public_keys.unwrap_or_default() {
if key.public_key == tp_id.signed.token {
return true;
}
}
tpid_ev.public_key == tp_id.signed.token
} else {
false
}
} else {
false
}
}