mirror of
https://github.com/1f349/dendrite.git
synced 2024-11-22 11:41:38 +00:00
Implement core redaction logic (#1185)
* Implement core redaction logic - Add a new `redactions_table.go` which tracks the mapping of the redaction event ID and the redacted event ID - Mark redactions as 'validated' when we have both events. - When redactions are validated, add `unsigned.redacted_because` and modify the `eventJSON` accordingly. Note: We currently do NOT redact the event content - it's gated behind a feature flag - until we have tested redactions a bit more. * Linting
This commit is contained in:
parent
65084c5052
commit
52c77cb4b4
@ -44,7 +44,7 @@ CREATE TABLE IF NOT EXISTS roomserver_event_json (
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const insertEventJSONSQL = "" +
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"INSERT INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)" +
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" ON CONFLICT DO NOTHING"
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" ON CONFLICT (event_nid) DO UPDATE SET event_json=$2"
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// Bulk event JSON lookup by numeric event ID.
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// Sort by the numeric event ID.
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121
roomserver/storage/postgres/redactions_table.go
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121
roomserver/storage/postgres/redactions_table.go
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@ -0,0 +1,121 @@
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// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package postgres
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import (
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"context"
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"database/sql"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/roomserver/storage/shared"
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"github.com/matrix-org/dendrite/roomserver/storage/tables"
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)
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const redactionsSchema = `
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-- Stores information about the redacted state of events.
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-- We need to track redactions rather than blindly updating the event JSON table on receipt of a redaction
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-- because we might receive the redaction BEFORE we receive the event which it redacts (think backfill).
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CREATE TABLE IF NOT EXISTS roomserver_redactions (
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redaction_event_id TEXT PRIMARY KEY,
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redacts_event_id TEXT NOT NULL,
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-- Initially FALSE, set to TRUE when the redaction has been validated according to rooms v3+ spec
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-- https://matrix.org/docs/spec/rooms/v3#authorization-rules-for-events
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validated BOOLEAN NOT NULL
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);
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CREATE INDEX IF NOT EXISTS roomserver_redactions_redacts_event_id ON roomserver_redactions(redacts_event_id);
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`
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const insertRedactionSQL = "" +
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"INSERT INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
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" VALUES ($1, $2, $3)"
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const selectRedactedEventSQL = "" +
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"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
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" WHERE redaction_event_id = $1"
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const selectRedactionEventSQL = "" +
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"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
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" WHERE redacts_event_id = $1"
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const markRedactionValidatedSQL = "" +
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" UPDATE roomserver_redactions SET validated = $2 WHERE redaction_event_id = $1"
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type redactionStatements struct {
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insertRedactionStmt *sql.Stmt
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selectRedactedEventStmt *sql.Stmt
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selectRedactionEventStmt *sql.Stmt
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markRedactionValidatedStmt *sql.Stmt
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}
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func NewPostgresRedactionsTable(db *sql.DB) (tables.Redactions, error) {
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s := &redactionStatements{}
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_, err := db.Exec(redactionsSchema)
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if err != nil {
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return nil, err
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}
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return s, shared.StatementList{
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{&s.insertRedactionStmt, insertRedactionSQL},
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{&s.selectRedactedEventStmt, selectRedactedEventSQL},
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{&s.selectRedactionEventStmt, selectRedactionEventSQL},
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{&s.markRedactionValidatedStmt, markRedactionValidatedSQL},
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}.Prepare(db)
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}
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func (s *redactionStatements) InsertRedaction(
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ctx context.Context, txn *sql.Tx, info tables.RedactionInfo,
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) error {
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stmt := sqlutil.TxStmt(txn, s.insertRedactionStmt)
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_, err := stmt.ExecContext(ctx, info.RedactionEventID, info.RedactsEventID, info.Validated)
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return err
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}
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func (s *redactionStatements) SelectRedactedEvent(
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ctx context.Context, txn *sql.Tx, redactionEventID string,
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) (info *tables.RedactionInfo, err error) {
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info = &tables.RedactionInfo{}
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stmt := sqlutil.TxStmt(txn, s.selectRedactedEventStmt)
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err = stmt.QueryRowContext(ctx, redactionEventID).Scan(
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&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
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)
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if err == sql.ErrNoRows {
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err = nil
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info = nil
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}
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return
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}
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func (s *redactionStatements) SelectRedactionEvent(
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ctx context.Context, txn *sql.Tx, redactedEventID string,
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) (info *tables.RedactionInfo, err error) {
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info = &tables.RedactionInfo{}
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stmt := sqlutil.TxStmt(txn, s.selectRedactionEventStmt)
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err = stmt.QueryRowContext(ctx, redactedEventID).Scan(
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&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
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)
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if err == sql.ErrNoRows {
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err = nil
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info = nil
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}
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return
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}
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func (s *redactionStatements) MarkRedactionValidated(
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ctx context.Context, txn *sql.Tx, redactionEventID string, validated bool,
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) error {
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stmt := sqlutil.TxStmt(txn, s.markRedactionValidatedStmt)
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_, err := stmt.ExecContext(ctx, redactionEventID, validated)
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return err
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}
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@ -91,6 +91,10 @@ func Open(dataSourceName string, dbProperties sqlutil.DbProperties) (*Database,
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if err != nil {
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return nil, err
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}
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redactions, err := NewPostgresRedactionsTable(db)
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if err != nil {
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return nil, err
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}
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d.Database = shared.Database{
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DB: db,
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EventTypesTable: eventTypes,
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@ -106,6 +110,7 @@ func Open(dataSourceName string, dbProperties sqlutil.DbProperties) (*Database,
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InvitesTable: invites,
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MembershipTable: membership,
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PublishedTable: published,
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RedactionsTable: redactions,
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}
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return &d, nil
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}
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@ -4,14 +4,27 @@ import (
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"context"
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"database/sql"
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"encoding/json"
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"fmt"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/storage/tables"
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"github.com/matrix-org/dendrite/roomserver/types"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/tidwall/gjson"
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)
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// Ideally, when we have both events we should redact the event JSON and forget about the redaction, but we currently
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// don't because the redaction code is brand new. When we are more certain that redactions don't misbehave or are
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// vulnerable to attacks from remote servers (e.g a server bypassing event auth rules shouldn't redact our data)
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// then we should flip this to true. This will mean redactions /actually delete information irretrievably/ which
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// will be necessary for compliance with the law. Note that downstream components (syncapi) WILL delete information
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// in their database on receipt of a redaction. Also note that we still modify the event JSON to set the field
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// unsigned.redacted_because - we just don't clear out the content fields yet.
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//
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// If this hasn't been done by 09/2020 this should be flipped to true.
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const redactionsArePermanent = false
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type Database struct {
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DB *sql.DB
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EventsTable tables.Events
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@ -27,6 +40,7 @@ type Database struct {
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InvitesTable tables.Invites
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MembershipTable tables.Membership
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PublishedTable tables.Published
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RedactionsTable tables.Redactions
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}
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func (d *Database) EventTypeNIDs(
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@ -298,6 +312,9 @@ func (d *Database) Events(
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return nil, err
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}
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}
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if !redactionsArePermanent {
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d.applyRedactions(results)
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}
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return results, nil
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}
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@ -403,7 +420,7 @@ func (d *Database) StoreEvent(
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return err
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}
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return nil
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return d.handleRedactions(ctx, txn, eventNID, event)
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})
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if err != nil {
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return 0, types.StateAtEvent{}, err
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@ -500,3 +517,125 @@ func extractRoomVersionFromCreateEvent(event gomatrixserverlib.Event) (
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}
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return roomVersion, err
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}
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// handleRedactions manages the redacted status of events. There's two cases to consider in order to comply with the spec:
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// "servers should not apply or send redactions to clients until both the redaction event and original event have been seen, and are valid."
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// https://matrix.org/docs/spec/rooms/v3#authorization-rules-for-events
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// These cases are:
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// - This is a redaction event, redact the event it references if we know about it.
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// - This is a normal event which may have been previously redacted.
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// In the first case, check if we have the referenced event then apply the redaction, else store it
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// in the redactions table with validated=FALSE. In the second case, check if there is a redaction for it:
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// if there is then apply the redactions and set validated=TRUE.
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//
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// When an event is redacted, the redacted event JSON is modified to add an `unsigned.redacted_because` field. We use this field
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// when loading events to determine whether to apply redactions. This keeps the hot-path of reading events quick as we don't need
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// to cross-reference with other tables when loading.
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func (d *Database) handleRedactions(ctx context.Context, txn *sql.Tx, eventNID types.EventNID, event gomatrixserverlib.Event) error {
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redactionEvent, redactedEvent, validated, err := d.loadRedactionPair(ctx, txn, eventNID, event)
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if err != nil {
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return err
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}
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if validated || redactedEvent == nil || redactionEvent == nil {
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// we've seen this redaction before or there is nothing to redact
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return nil
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}
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// mark the event as redacted
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err = redactedEvent.SetUnsignedField("redacted_because", redactionEvent)
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if err != nil {
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return err
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}
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if redactionsArePermanent {
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redactedEvent.Event = redactedEvent.Redact()
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}
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// overwrite the eventJSON table
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err = d.EventJSONTable.InsertEventJSON(ctx, txn, redactedEvent.EventNID, redactedEvent.JSON())
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if err != nil {
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return err
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}
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return d.RedactionsTable.MarkRedactionValidated(ctx, txn, redactionEvent.EventID(), true)
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}
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// loadRedactionPair returns both the redaction event and the redacted event, else nil.
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// nolint:gocyclo
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func (d *Database) loadRedactionPair(
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ctx context.Context, txn *sql.Tx, eventNID types.EventNID, event gomatrixserverlib.Event,
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) (*types.Event, *types.Event, bool, error) {
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var redactionEvent, redactedEvent *types.Event
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var info *tables.RedactionInfo
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var nids map[string]types.EventNID
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var evs []types.Event
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var err error
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isRedactionEvent := event.Type() == gomatrixserverlib.MRoomRedaction && event.StateKey() == nil
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if isRedactionEvent {
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redactionEvent = &types.Event{
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EventNID: eventNID,
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Event: event,
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}
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// find the redacted event if one exists
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info, err = d.RedactionsTable.SelectRedactedEvent(ctx, txn, event.EventID())
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if err != nil {
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return nil, nil, false, err
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}
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if info == nil {
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// we don't have the redacted event yet
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return nil, nil, false, nil
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}
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nids, err = d.EventNIDs(ctx, []string{info.RedactsEventID})
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if err != nil {
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return nil, nil, false, err
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}
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if len(nids) == 0 {
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return nil, nil, false, fmt.Errorf("redaction: missing event NID being redacted: %+v", info)
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}
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evs, err = d.Events(ctx, []types.EventNID{nids[info.RedactsEventID]})
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if err != nil {
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return nil, nil, false, err
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}
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if len(evs) != 1 {
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return nil, nil, false, fmt.Errorf("redaction: missing event being redacted: %+v", info)
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}
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redactedEvent = &evs[0]
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} else {
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redactedEvent = &types.Event{
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EventNID: eventNID,
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Event: event,
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}
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// find the redaction event if one exists
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info, err = d.RedactionsTable.SelectRedactionEvent(ctx, txn, event.EventID())
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if err != nil {
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return nil, nil, false, err
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}
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if info == nil {
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// this event is not redacted
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return nil, nil, false, nil
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}
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nids, err = d.EventNIDs(ctx, []string{info.RedactionEventID})
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if err != nil {
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return nil, nil, false, err
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}
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if len(nids) == 0 {
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return nil, nil, false, fmt.Errorf("redaction: missing redaction event NID: %+v", info)
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}
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evs, err = d.Events(ctx, []types.EventNID{nids[info.RedactionEventID]})
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if err != nil {
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return nil, nil, false, err
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}
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if len(evs) != 1 {
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return nil, nil, false, fmt.Errorf("redaction: missing redaction event: %+v", info)
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}
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redactionEvent = &evs[0]
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}
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return redactionEvent, redactedEvent, info.Validated, nil
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}
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// applyRedactions will redact events that have an `unsigned.redacted_because` field.
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func (d *Database) applyRedactions(events []types.Event) {
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for i := range events {
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if result := gjson.GetBytes(events[i].Unsigned(), "redacted_because"); result.Exists() {
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events[i].Event = events[i].Redact()
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}
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}
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}
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@ -35,8 +35,7 @@ const eventJSONSchema = `
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`
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const insertEventJSONSQL = `
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INSERT INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)
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ON CONFLICT DO NOTHING
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INSERT OR REPLACE INTO roomserver_event_json (event_nid, event_json) VALUES ($1, $2)
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`
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// Bulk event JSON lookup by numeric event ID.
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120
roomserver/storage/sqlite3/redactions_table.go
Normal file
120
roomserver/storage/sqlite3/redactions_table.go
Normal file
@ -0,0 +1,120 @@
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// Copyright 2020 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sqlite3
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import (
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"context"
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"database/sql"
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"github.com/matrix-org/dendrite/internal/sqlutil"
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"github.com/matrix-org/dendrite/roomserver/storage/shared"
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"github.com/matrix-org/dendrite/roomserver/storage/tables"
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)
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const redactionsSchema = `
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-- Stores information about the redacted state of events.
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-- We need to track redactions rather than blindly updating the event JSON table on receipt of a redaction
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-- because we might receive the redaction BEFORE we receive the event which it redacts (think backfill).
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CREATE TABLE IF NOT EXISTS roomserver_redactions (
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redaction_event_id TEXT PRIMARY KEY,
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redacts_event_id TEXT NOT NULL,
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-- Initially FALSE, set to TRUE when the redaction has been validated according to rooms v3+ spec
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-- https://matrix.org/docs/spec/rooms/v3#authorization-rules-for-events
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validated BOOLEAN NOT NULL
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);
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`
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const insertRedactionSQL = "" +
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"INSERT INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
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" VALUES ($1, $2, $3)"
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const selectRedactedEventSQL = "" +
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"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
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" WHERE redaction_event_id = $1"
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const selectRedactionEventSQL = "" +
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"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
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" WHERE redacts_event_id = $1"
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const markRedactionValidatedSQL = "" +
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" UPDATE roomserver_redactions SET validated = $2 WHERE redaction_event_id = $1"
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type redactionStatements struct {
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insertRedactionStmt *sql.Stmt
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selectRedactedEventStmt *sql.Stmt
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selectRedactionEventStmt *sql.Stmt
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markRedactionValidatedStmt *sql.Stmt
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}
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func NewSqliteRedactionsTable(db *sql.DB) (tables.Redactions, error) {
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s := &redactionStatements{}
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_, err := db.Exec(redactionsSchema)
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if err != nil {
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return nil, err
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}
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return s, shared.StatementList{
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{&s.insertRedactionStmt, insertRedactionSQL},
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{&s.selectRedactedEventStmt, selectRedactedEventSQL},
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{&s.selectRedactionEventStmt, selectRedactionEventSQL},
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{&s.markRedactionValidatedStmt, markRedactionValidatedSQL},
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}.Prepare(db)
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}
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func (s *redactionStatements) InsertRedaction(
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ctx context.Context, txn *sql.Tx, info tables.RedactionInfo,
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) error {
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stmt := sqlutil.TxStmt(txn, s.insertRedactionStmt)
|
||||
_, err := stmt.ExecContext(ctx, info.RedactionEventID, info.RedactsEventID, info.Validated)
|
||||
return err
|
||||
}
|
||||
|
||||
func (s *redactionStatements) SelectRedactedEvent(
|
||||
ctx context.Context, txn *sql.Tx, redactionEventID string,
|
||||
) (info *tables.RedactionInfo, err error) {
|
||||
info = &tables.RedactionInfo{}
|
||||
stmt := sqlutil.TxStmt(txn, s.selectRedactedEventStmt)
|
||||
err = stmt.QueryRowContext(ctx, redactionEventID).Scan(
|
||||
&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
|
||||
)
|
||||
if err == sql.ErrNoRows {
|
||||
info = nil
|
||||
err = nil
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (s *redactionStatements) SelectRedactionEvent(
|
||||
ctx context.Context, txn *sql.Tx, redactedEventID string,
|
||||
) (info *tables.RedactionInfo, err error) {
|
||||
info = &tables.RedactionInfo{}
|
||||
stmt := sqlutil.TxStmt(txn, s.selectRedactionEventStmt)
|
||||
err = stmt.QueryRowContext(ctx, redactedEventID).Scan(
|
||||
&info.RedactionEventID, &info.RedactsEventID, &info.Validated,
|
||||
)
|
||||
if err == sql.ErrNoRows {
|
||||
info = nil
|
||||
err = nil
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (s *redactionStatements) MarkRedactionValidated(
|
||||
ctx context.Context, txn *sql.Tx, redactionEventID string, validated bool,
|
||||
) error {
|
||||
stmt := sqlutil.TxStmt(txn, s.markRedactionValidatedStmt)
|
||||
_, err := stmt.ExecContext(ctx, redactionEventID, validated)
|
||||
return err
|
||||
}
|
@ -114,6 +114,10 @@ func Open(dataSourceName string) (*Database, error) {
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
redactions, err := NewSqliteRedactionsTable(d.db)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
d.Database = shared.Database{
|
||||
DB: d.db,
|
||||
EventsTable: d.events,
|
||||
@ -129,6 +133,7 @@ func Open(dataSourceName string) (*Database, error) {
|
||||
InvitesTable: d.invites,
|
||||
MembershipTable: d.membership,
|
||||
PublishedTable: published,
|
||||
RedactionsTable: redactions,
|
||||
}
|
||||
return &d, nil
|
||||
}
|
||||
|
@ -14,6 +14,7 @@ type EventJSONPair struct {
|
||||
}
|
||||
|
||||
type EventJSON interface {
|
||||
// Insert the event JSON. On conflict, replace the event JSON with the new value (for redactions).
|
||||
InsertEventJSON(ctx context.Context, tx *sql.Tx, eventNID types.EventNID, eventJSON []byte) error
|
||||
BulkSelectEventJSON(ctx context.Context, eventNIDs []types.EventNID) ([]EventJSONPair, error)
|
||||
}
|
||||
@ -126,3 +127,23 @@ type Published interface {
|
||||
SelectPublishedFromRoomID(ctx context.Context, roomID string) (published bool, err error)
|
||||
SelectAllPublishedRooms(ctx context.Context, published bool) ([]string, error)
|
||||
}
|
||||
|
||||
type RedactionInfo struct {
|
||||
// whether this redaction is validated (we have both events)
|
||||
Validated bool
|
||||
// the ID of the event being redacted
|
||||
RedactsEventID string
|
||||
// the ID of the redaction event
|
||||
RedactionEventID string
|
||||
}
|
||||
|
||||
type Redactions interface {
|
||||
InsertRedaction(ctx context.Context, txn *sql.Tx, info RedactionInfo) error
|
||||
// SelectRedactedEvent returns the redaction info for the given redaction event ID, or nil if there is no match.
|
||||
SelectRedactedEvent(ctx context.Context, txn *sql.Tx, redactionEventID string) (*RedactionInfo, error)
|
||||
// SelectRedactionEvent returns the redaction info for the given redacted event ID, or nil if there is no match.
|
||||
SelectRedactionEvent(ctx context.Context, txn *sql.Tx, redactedEventID string) (*RedactionInfo, error)
|
||||
// Mark this redaction event as having been validated. This means we have both sides of the redaction and have
|
||||
// successfully redacted the event JSON.
|
||||
MarkRedactionValidated(ctx context.Context, txn *sql.Tx, redactionEventID string, validated bool) error
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user