package state import ( "fmt" "sort" "github.com/hashicorp/consul/agent/structs" "github.com/hashicorp/go-memdb" ) const ( intentionsTableName = "connect-intentions" ) // intentionsTableSchema returns a new table schema used for storing // intentions for Connect. func intentionsTableSchema() *memdb.TableSchema { return &memdb.TableSchema{ Name: intentionsTableName, Indexes: map[string]*memdb.IndexSchema{ "id": { Name: "id", AllowMissing: false, Unique: true, Indexer: &memdb.UUIDFieldIndex{ Field: "ID", }, }, "destination": { Name: "destination", AllowMissing: true, // This index is not unique since we need uniqueness across the whole // 4-tuple. Unique: false, Indexer: &memdb.CompoundIndex{ Indexes: []memdb.Indexer{ &memdb.StringFieldIndex{ Field: "DestinationNS", Lowercase: true, }, &memdb.StringFieldIndex{ Field: "DestinationName", Lowercase: true, }, }, }, }, "source": { Name: "source", AllowMissing: true, // This index is not unique since we need uniqueness across the whole // 4-tuple. Unique: false, Indexer: &memdb.CompoundIndex{ Indexes: []memdb.Indexer{ &memdb.StringFieldIndex{ Field: "SourceNS", Lowercase: true, }, &memdb.StringFieldIndex{ Field: "SourceName", Lowercase: true, }, }, }, }, "source_destination": { Name: "source_destination", AllowMissing: true, Unique: true, Indexer: &memdb.CompoundIndex{ Indexes: []memdb.Indexer{ &memdb.StringFieldIndex{ Field: "SourceNS", Lowercase: true, }, &memdb.StringFieldIndex{ Field: "SourceName", Lowercase: true, }, &memdb.StringFieldIndex{ Field: "DestinationNS", Lowercase: true, }, &memdb.StringFieldIndex{ Field: "DestinationName", Lowercase: true, }, }, }, }, }, } } func init() { registerSchema(intentionsTableSchema) } // Intentions is used to pull all the intentions from the snapshot. func (s *Snapshot) Intentions() (structs.Intentions, error) { ixns, err := s.tx.Get(intentionsTableName, "id") if err != nil { return nil, err } var ret structs.Intentions for wrapped := ixns.Next(); wrapped != nil; wrapped = ixns.Next() { ret = append(ret, wrapped.(*structs.Intention)) } return ret, nil } // Intention is used when restoring from a snapshot. func (s *Restore) Intention(ixn *structs.Intention) error { // Insert the intention if err := s.tx.Insert(intentionsTableName, ixn); err != nil { return fmt.Errorf("failed restoring intention: %s", err) } if err := indexUpdateMaxTxn(s.tx, ixn.ModifyIndex, intentionsTableName); err != nil { return fmt.Errorf("failed updating index: %s", err) } return nil } // Intentions returns the list of all intentions. func (s *Store) Intentions(ws memdb.WatchSet) (uint64, structs.Intentions, error) { tx := s.db.Txn(false) defer tx.Abort() // Get the index idx := maxIndexTxn(tx, intentionsTableName) if idx < 1 { idx = 1 } // Get all intentions iter, err := tx.Get(intentionsTableName, "id") if err != nil { return 0, nil, fmt.Errorf("failed intention lookup: %s", err) } ws.Add(iter.WatchCh()) var results structs.Intentions for ixn := iter.Next(); ixn != nil; ixn = iter.Next() { results = append(results, ixn.(*structs.Intention)) } // Sort by precedence just because that's nicer and probably what most clients // want for presentation. sort.Sort(structs.IntentionPrecedenceSorter(results)) return idx, results, nil } // IntentionSet creates or updates an intention. func (s *Store) IntentionSet(idx uint64, ixn *structs.Intention) error { tx := s.db.WriteTxn(idx) defer tx.Abort() if err := s.intentionSetTxn(tx, idx, ixn); err != nil { return err } return tx.Commit() } // intentionSetTxn is the inner method used to insert an intention with // the proper indexes into the state store. func (s *Store) intentionSetTxn(tx *txn, idx uint64, ixn *structs.Intention) error { // ID is required if ixn.ID == "" { return ErrMissingIntentionID } // Ensure Precedence is populated correctly on "write" ixn.UpdatePrecedence() // Check for an existing intention existing, err := tx.First(intentionsTableName, "id", ixn.ID) if err != nil { return fmt.Errorf("failed intention lookup: %s", err) } if existing != nil { oldIxn := existing.(*structs.Intention) ixn.CreateIndex = oldIxn.CreateIndex ixn.CreatedAt = oldIxn.CreatedAt } else { ixn.CreateIndex = idx } ixn.ModifyIndex = idx // Check for duplicates on the 4-tuple. duplicate, err := tx.First(intentionsTableName, "source_destination", ixn.SourceNS, ixn.SourceName, ixn.DestinationNS, ixn.DestinationName) if err != nil { return fmt.Errorf("failed intention lookup: %s", err) } if duplicate != nil { dupIxn := duplicate.(*structs.Intention) // Same ID is OK - this is an update if dupIxn.ID != ixn.ID { return fmt.Errorf("duplicate intention found: %s", dupIxn.String()) } } // We always force meta to be non-nil so that we its an empty map. // This makes it easy for API responses to not nil-check this everywhere. if ixn.Meta == nil { ixn.Meta = make(map[string]string) } // Insert if err := tx.Insert(intentionsTableName, ixn); err != nil { return err } if err := tx.Insert("index", &IndexEntry{intentionsTableName, idx}); err != nil { return fmt.Errorf("failed updating index: %s", err) } return nil } // IntentionGet returns the given intention by ID. func (s *Store) IntentionGet(ws memdb.WatchSet, id string) (uint64, *structs.Intention, error) { tx := s.db.Txn(false) defer tx.Abort() // Get the table index. idx := maxIndexTxn(tx, intentionsTableName) if idx < 1 { idx = 1 } // Look up by its ID. watchCh, intention, err := tx.FirstWatch(intentionsTableName, "id", id) if err != nil { return 0, nil, fmt.Errorf("failed intention lookup: %s", err) } ws.Add(watchCh) // Convert the interface{} if it is non-nil var result *structs.Intention if intention != nil { result = intention.(*structs.Intention) } return idx, result, nil } // IntentionDelete deletes the given intention by ID. func (s *Store) IntentionDelete(idx uint64, id string) error { tx := s.db.WriteTxn(idx) defer tx.Abort() if err := s.intentionDeleteTxn(tx, idx, id); err != nil { return fmt.Errorf("failed intention delete: %s", err) } return tx.Commit() } // intentionDeleteTxn is the inner method used to delete a intention // with the proper indexes into the state store. func (s *Store) intentionDeleteTxn(tx *txn, idx uint64, queryID string) error { // Pull the query. wrapped, err := tx.First(intentionsTableName, "id", queryID) if err != nil { return fmt.Errorf("failed intention lookup: %s", err) } if wrapped == nil { return nil } // Delete the query and update the index. if err := tx.Delete(intentionsTableName, wrapped); err != nil { return fmt.Errorf("failed intention delete: %s", err) } if err := tx.Insert("index", &IndexEntry{intentionsTableName, idx}); err != nil { return fmt.Errorf("failed updating index: %s", err) } return nil } // IntentionMatch returns the list of intentions that match the namespace and // name for either a source or destination. This applies the resolution rules // so wildcards will match any value. // // The returned value is the list of intentions in the same order as the // entries in args. The intentions themselves are sorted based on the // intention precedence rules. i.e. result[0][0] is the highest precedent // rule to match for the first entry. func (s *Store) IntentionMatch(ws memdb.WatchSet, args *structs.IntentionQueryMatch) (uint64, []structs.Intentions, error) { tx := s.db.Txn(false) defer tx.Abort() // Get the table index. idx := maxIndexTxn(tx, intentionsTableName) if idx < 1 { idx = 1 } // Make all the calls and accumulate the results results := make([]structs.Intentions, len(args.Entries)) for i, entry := range args.Entries { // Each search entry may require multiple queries to memdb, so this // returns the arguments for each necessary Get. Note on performance: // this is not the most optimal set of queries since we repeat some // many times (such as */*). We can work on improving that in the // future, the test cases shouldn't have to change for that. getParams, err := s.intentionMatchGetParams(entry) if err != nil { return 0, nil, err } // Perform each call and accumulate the result. var ixns structs.Intentions for _, params := range getParams { iter, err := tx.Get(intentionsTableName, string(args.Type), params...) if err != nil { return 0, nil, fmt.Errorf("failed intention lookup: %s", err) } ws.Add(iter.WatchCh()) for ixn := iter.Next(); ixn != nil; ixn = iter.Next() { ixns = append(ixns, ixn.(*structs.Intention)) } } // Sort the results by precedence sort.Sort(structs.IntentionPrecedenceSorter(ixns)) // Store the result results[i] = ixns } return idx, results, nil } // intentionMatchGetParams returns the tx.Get parameters to find all the // intentions for a certain entry. func (s *Store) intentionMatchGetParams(entry structs.IntentionMatchEntry) ([][]interface{}, error) { // We always query for "*/*" so include that. If the namespace is a // wildcard, then we're actually done. result := make([][]interface{}, 0, 3) result = append(result, []interface{}{structs.WildcardSpecifier, structs.WildcardSpecifier}) if entry.Namespace == structs.WildcardSpecifier { return result, nil } // Search for NS/* intentions. If we have a wildcard name, then we're done. result = append(result, []interface{}{entry.Namespace, structs.WildcardSpecifier}) if entry.Name == structs.WildcardSpecifier { return result, nil } // Search for the exact NS/N value. result = append(result, []interface{}{entry.Namespace, entry.Name}) return result, nil }