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Move the auth checks to a separate file (#5)

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This commit is contained in:
Mark Haines 2017-02-10 10:44:38 +00:00 committed by GitHub
parent a3e1774987
commit c72a44097f
3 changed files with 197 additions and 191 deletions
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197
src/github.com/matrix-org/dendrite/roomserver/input/authevents.go Normal file
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@ -0,0 +1,197 @@
package input
import (
"github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib"
"sort"
)
// checkAuthEvents checks that the event passes authentication checks
// Returns the numeric IDs for the auth events.
func checkAuthEvents(db RoomEventDatabase, event gomatrixserverlib.Event, authEventIDs []string) ([]int64, error) {
// Grab the numeric IDs for the supplied auth state events from the database.
authStateEntries, err := db.StateEntriesForEventIDs(authEventIDs)
if err != nil {
return nil, err
}
// TODO: check for duplicate state keys here.
// Work out which of the state events we actually need.
stateNeeded := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{event})
// Load the actual auth events from the database.
authEvents, err := loadAuthEvents(db, stateNeeded, authStateEntries)
if err != nil {
return nil, err
}
// Check if the event is allowed.
if err = gomatrixserverlib.Allowed(event, &authEvents); err != nil {
return nil, err
}
// Return the numeric IDs for the auth events.
result := make([]int64, len(authStateEntries))
for i := range authStateEntries {
result[i] = authStateEntries[i].EventNID
}
return result, nil
}
type authEvents struct {
stateKeyNIDMap map[string]int64
state stateEntryMap
events eventMap
}
// Create implements gomatrixserverlib.AuthEvents
func (ae *authEvents) Create() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomCreateNID), nil
}
// PowerLevels implements gomatrixserverlib.AuthEvents
func (ae *authEvents) PowerLevels() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomPowerLevelsNID), nil
}
// JoinRules implements gomatrixserverlib.AuthEvents
func (ae *authEvents) JoinRules() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomJoinRulesNID), nil
}
// Memmber implements gomatrixserverlib.AuthEvents
func (ae *authEvents) Member(stateKey string) (*gomatrixserverlib.Event, error) {
return ae.lookupEvent(types.MRoomMemberNID, stateKey), nil
}
// ThirdPartyInvite implements gomatrixserverlib.AuthEvents
func (ae *authEvents) ThirdPartyInvite(stateKey string) (*gomatrixserverlib.Event, error) {
return ae.lookupEvent(types.MRoomThirdPartyInviteNID, stateKey), nil
}
func (ae *authEvents) lookupEventWithEmptyStateKey(typeNID int64) *gomatrixserverlib.Event {
eventNID, ok := ae.state.lookup(types.StateKeyTuple{typeNID, types.EmptyStateKeyNID})
if !ok {
return nil
}
event, ok := ae.events.lookup(eventNID)
if !ok {
return nil
}
return &event.Event
}
func (ae *authEvents) lookupEvent(typeNID int64, stateKey string) *gomatrixserverlib.Event {
stateKeyNID, ok := ae.stateKeyNIDMap[stateKey]
if !ok {
return nil
}
eventNID, ok := ae.state.lookup(types.StateKeyTuple{typeNID, stateKeyNID})
if !ok {
return nil
}
event, ok := ae.events.lookup(eventNID)
if !ok {
return nil
}
return &event.Event
}
// loadAuthEvents loads the events needed for authentication from the supplied room state.
func loadAuthEvents(
db RoomEventDatabase,
needed gomatrixserverlib.StateNeeded,
state []types.StateEntry,
) (result authEvents, err error) {
// Lookup the numeric IDs for the state keys needed for auth.
var neededStateKeys []string
neededStateKeys = append(neededStateKeys, needed.Member...)
neededStateKeys = append(neededStateKeys, needed.ThirdPartyInvite...)
if result.stateKeyNIDMap, err = db.EventStateKeyNIDs(neededStateKeys); err != nil {
return
}
// Load the events we need.
result.state = state
var eventNIDs []int64
keyTuplesNeeded := stateKeyTuplesNeeded(result.stateKeyNIDMap, needed)
for _, keyTuple := range keyTuplesNeeded {
eventNID, ok := result.state.lookup(keyTuple)
if ok {
eventNIDs = append(eventNIDs, eventNID)
}
}
if result.events, err = db.Events(eventNIDs); err != nil {
return
}
return
}
// stateKeyTuplesNeeded works out which numeric state key tuples we need to authenticate some events.
func stateKeyTuplesNeeded(stateKeyNIDMap map[string]int64, stateNeeded gomatrixserverlib.StateNeeded) []types.StateKeyTuple {
var keyTuples []types.StateKeyTuple
if stateNeeded.Create {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomCreateNID, types.EmptyStateKeyNID})
}
if stateNeeded.PowerLevels {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomPowerLevelsNID, types.EmptyStateKeyNID})
}
if stateNeeded.JoinRules {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomJoinRulesNID, types.EmptyStateKeyNID})
}
for _, member := range stateNeeded.Member {
stateKeyNID, ok := stateKeyNIDMap[member]
if ok {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomMemberNID, stateKeyNID})
}
}
for _, token := range stateNeeded.ThirdPartyInvite {
stateKeyNID, ok := stateKeyNIDMap[token]
if ok {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomThirdPartyInviteNID, stateKeyNID})
}
}
return keyTuples
}
// Map from event type, state key tuple to numeric event ID.
// Implemented using binary search on a sorted array.
type stateEntryMap []types.StateEntry
// lookup an entry in the event map.
func (m stateEntryMap) lookup(stateKey types.StateKeyTuple) (eventNID int64, ok bool) {
// Since the list is sorted we can implement this using binary search.
// This is faster than using a hash map.
// We don't have to worry about pathological cases because the keys are fixed
// size and are controlled by us.
list := []types.StateEntry(m)
i := sort.Search(len(list), func(i int) bool {
return !list[i].StateKeyTuple.LessThan(stateKey)
})
if i < len(list) && list[i].StateKeyTuple == stateKey {
ok = true
eventNID = list[i].EventNID
}
return
}
// Map from numeric event ID to event.
// Implemented using binary search on a sorted array.
type eventMap []types.Event
// lookup an entry in the event map.
func (m eventMap) lookup(eventNID int64) (event *types.Event, ok bool) {
// Since the list is sorted we can implement this using binary search.
// This is faster than using a hash map.
// We don't have to worry about pathological cases because the keys are fixed
// size are controlled by us.
list := []types.Event(m)
i := sort.Search(len(list), func(i int) bool {
return list[i].EventNID >= eventNID
})
if i < len(list) && list[i].EventNID == eventNID {
ok = true
event = &list[i]
}
return
}

0
src/github.com/matrix-org/dendrite/roomserver/input/events_test.go → src/github.com/matrix-org/dendrite/roomserver/input/authevents_test.go
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191
src/github.com/matrix-org/dendrite/roomserver/input/events.go
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@ -4,7 +4,6 @@ import (
"github.com/matrix-org/dendrite/roomserver/api" "github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/types" "github.com/matrix-org/dendrite/roomserver/types"
"github.com/matrix-org/gomatrixserverlib" "github.com/matrix-org/gomatrixserverlib"
"sort"
) )
// A RoomEventDatabase has the storage APIs needed to store a room event. // A RoomEventDatabase has the storage APIs needed to store a room event.
@ -62,193 +61,3 @@ func processRoomEvent(db RoomEventDatabase, input api.InputRoomEvent) error {
// - The changes to the current state of the room. // - The changes to the current state of the room.
panic("Not implemented") panic("Not implemented")
} }
// checkAuthEvents checks that the event passes authentication checks
// Returns the numeric IDs for the auth events.
func checkAuthEvents(db RoomEventDatabase, event gomatrixserverlib.Event, authEventIDs []string) ([]int64, error) {
// Grab the numeric IDs for the supplied auth state events from the database.
authStateEntries, err := db.StateEntriesForEventIDs(authEventIDs)
if err != nil {
return nil, err
}
// TODO: check for duplicate state keys here.
// Work out which of the state events we actually need.
stateNeeded := gomatrixserverlib.StateNeededForAuth([]gomatrixserverlib.Event{event})
// Load the actual auth events from the database.
authEvents, err := loadAuthEvents(db, stateNeeded, authStateEntries)
if err != nil {
return nil, err
}
// Check if the event is allowed.
if err = gomatrixserverlib.Allowed(event, &authEvents); err != nil {
return nil, err
}
// Return the numeric IDs for the auth events.
result := make([]int64, len(authStateEntries))
for i := range authStateEntries {
result[i] = authStateEntries[i].EventNID
}
return result, nil
}
type authEvents struct {
stateKeyNIDMap map[string]int64
state stateEntryMap
events eventMap
}
// Create implements gomatrixserverlib.AuthEvents
func (ae *authEvents) Create() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomCreateNID), nil
}
// PowerLevels implements gomatrixserverlib.AuthEvents
func (ae *authEvents) PowerLevels() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomPowerLevelsNID), nil
}
// JoinRules implements gomatrixserverlib.AuthEvents
func (ae *authEvents) JoinRules() (*gomatrixserverlib.Event, error) {
return ae.lookupEventWithEmptyStateKey(types.MRoomJoinRulesNID), nil
}
// Memmber implements gomatrixserverlib.AuthEvents
func (ae *authEvents) Member(stateKey string) (*gomatrixserverlib.Event, error) {
return ae.lookupEvent(types.MRoomMemberNID, stateKey), nil
}
// ThirdPartyInvite implements gomatrixserverlib.AuthEvents
func (ae *authEvents) ThirdPartyInvite(stateKey string) (*gomatrixserverlib.Event, error) {
return ae.lookupEvent(types.MRoomThirdPartyInviteNID, stateKey), nil
}
func (ae *authEvents) lookupEventWithEmptyStateKey(typeNID int64) *gomatrixserverlib.Event {
eventNID, ok := ae.state.lookup(types.StateKeyTuple{typeNID, types.EmptyStateKeyNID})
if !ok {
return nil
}
event, ok := ae.events.lookup(eventNID)
if !ok {
return nil
}
return &event.Event
}
func (ae *authEvents) lookupEvent(typeNID int64, stateKey string) *gomatrixserverlib.Event {
stateKeyNID, ok := ae.stateKeyNIDMap[stateKey]
if !ok {
return nil
}
eventNID, ok := ae.state.lookup(types.StateKeyTuple{typeNID, stateKeyNID})
if !ok {
return nil
}
event, ok := ae.events.lookup(eventNID)
if !ok {
return nil
}
return &event.Event
}
// loadAuthEvents loads the events needed for authentication from the supplied room state.
func loadAuthEvents(
db RoomEventDatabase,
needed gomatrixserverlib.StateNeeded,
state []types.StateEntry,
) (result authEvents, err error) {
// Lookup the numeric IDs for the state keys needed for auth.
var neededStateKeys []string
neededStateKeys = append(neededStateKeys, needed.Member...)
neededStateKeys = append(neededStateKeys, needed.ThirdPartyInvite...)
if result.stateKeyNIDMap, err = db.EventStateKeyNIDs(neededStateKeys); err != nil {
return
}
// Load the events we need.
result.state = state
var eventNIDs []int64
keyTuplesNeeded := stateKeyTuplesNeeded(result.stateKeyNIDMap, needed)
for _, keyTuple := range keyTuplesNeeded {
eventNID, ok := result.state.lookup(keyTuple)
if ok {
eventNIDs = append(eventNIDs, eventNID)
}
}
if result.events, err = db.Events(eventNIDs); err != nil {
return
}
return
}
// stateKeyTuplesNeeded works out which numeric state key tuples we need to authenticate some events.
func stateKeyTuplesNeeded(stateKeyNIDMap map[string]int64, stateNeeded gomatrixserverlib.StateNeeded) []types.StateKeyTuple {
var keyTuples []types.StateKeyTuple
if stateNeeded.Create {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomCreateNID, types.EmptyStateKeyNID})
}
if stateNeeded.PowerLevels {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomPowerLevelsNID, types.EmptyStateKeyNID})
}
if stateNeeded.JoinRules {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomJoinRulesNID, types.EmptyStateKeyNID})
}
for _, member := range stateNeeded.Member {
stateKeyNID, ok := stateKeyNIDMap[member]
if ok {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomMemberNID, stateKeyNID})
}
}
for _, token := range stateNeeded.ThirdPartyInvite {
stateKeyNID, ok := stateKeyNIDMap[token]
if ok {
keyTuples = append(keyTuples, types.StateKeyTuple{types.MRoomThirdPartyInviteNID, stateKeyNID})
}
}
return keyTuples
}
// Map from event type, state key tuple to numeric event ID.
// Implemented using binary search on a sorted array.
type stateEntryMap []types.StateEntry
// lookup an entry in the event map.
func (m stateEntryMap) lookup(stateKey types.StateKeyTuple) (eventNID int64, ok bool) {
// Since the list is sorted we can implement this using binary search.
// This is faster than using a hash map.
// We don't have to worry about pathological cases because the keys are fixed
// size and are controlled by us.
list := []types.StateEntry(m)
i := sort.Search(len(list), func(i int) bool {
return !list[i].StateKeyTuple.LessThan(stateKey)
})
if i < len(list) && list[i].StateKeyTuple == stateKey {
ok = true
eventNID = list[i].EventNID
}
return
}
// Map from numeric event ID to event.
// Implemented using binary search on a sorted array.
type eventMap []types.Event
// lookup an entry in the event map.
func (m eventMap) lookup(eventNID int64) (event *types.Event, ok bool) {
// Since the list is sorted we can implement this using binary search.
// This is faster than using a hash map.
// We don't have to worry about pathological cases because the keys are fixed
// size are controlled by us.
list := []types.Event(m)
i := sort.Search(len(list), func(i int) bool {
return list[i].EventNID >= eventNID
})
if i < len(list) && list[i].EventNID == eventNID {
ok = true
event = &list[i]
}
return
}