package audit import ( "github.com/nspcc-dev/neo-go/pkg/interop" "github.com/nspcc-dev/neo-go/pkg/interop/contract" "github.com/nspcc-dev/neo-go/pkg/interop/iterator" "github.com/nspcc-dev/neo-go/pkg/interop/native/crypto" "github.com/nspcc-dev/neo-go/pkg/interop/native/management" "github.com/nspcc-dev/neo-go/pkg/interop/runtime" "github.com/nspcc-dev/neo-go/pkg/interop/storage" "github.com/nspcc-dev/neofs-contract/common" ) type ( auditHeader struct { epoch int cid []byte from interop.PublicKey } ) // Audit key is a combination of epoch, container ID and public key of node that // executed audit. Together it should be no more than 64 bytes. We can't shrink // epoch and container ID since we iterate over these values. But we can shrink // public key by using first bytes of the hashed value. // V2 format const maxKeySize = 24 // 24 + 32 (container ID length) + 8 (epoch length) = 64 func (a auditHeader) ID() []byte { var buf interface{} = a.epoch hashedKey := crypto.Sha256(a.from) shortedKey := hashedKey[:maxKeySize] return append(buf.([]byte), append(a.cid, shortedKey...)...) } const ( netmapContractKey = "netmapScriptHash" notaryDisabledKey = "notary" ) func _deploy(data interface{}, isUpdate bool) { if isUpdate { return } args := data.(struct { notaryDisabled bool addrNetmap interop.Hash160 }) ctx := storage.GetContext() if len(args.addrNetmap) != 20 { panic("incorrect length of contract script hash") } storage.Put(ctx, netmapContractKey, args.addrNetmap) // initialize the way to collect signatures storage.Put(ctx, notaryDisabledKey, args.notaryDisabled) if args.notaryDisabled { runtime.Log("audit contract notary disabled") } runtime.Log("audit contract initialized") } // Update method updates contract source code and manifest. Can be invoked // only by committee. func Update(script []byte, manifest []byte, data interface{}) { if !common.HasUpdateAccess() { panic("only committee can update contract") } contract.Call(interop.Hash160(management.Hash), "update", contract.All, script, manifest, common.AppendVersion(data)) runtime.Log("audit contract updated") } // Put method stores stable marshalled `DataAuditResult` structure. Can be // invoked only by Inner Ring nodes. // // Inner Ring nodes perform audit of the containers and produce `DataAuditResult` // structures. They are being stored in audit contract and used for settlements // in later epochs. func Put(rawAuditResult []byte) { ctx := storage.GetContext() notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool) var innerRing []common.IRNode if notaryDisabled { netmapContract := storage.Get(ctx, netmapContractKey).(interop.Hash160) innerRing = common.InnerRingNodesFromNetmap(netmapContract) } else { innerRing = common.InnerRingNodes() } hdr := newAuditHeader(rawAuditResult) presented := false for i := range innerRing { ir := innerRing[i] if common.BytesEqual(ir.PublicKey, hdr.from) { presented = true break } } if !runtime.CheckWitness(hdr.from) || !presented { panic("put access denied") } storage.Put(ctx, hdr.ID(), rawAuditResult) runtime.Log("audit: result has been saved") } // Get method returns stable marshaled DataAuditResult structure. // // ID of the DataAuditResult can be obtained from listing methods. func Get(id []byte) []byte { ctx := storage.GetReadOnlyContext() return storage.Get(ctx, id).([]byte) } // List method returns list of all available DataAuditResult IDs from // contract storage. func List() [][]byte { ctx := storage.GetReadOnlyContext() it := storage.Find(ctx, []byte{}, storage.KeysOnly) return list(it) } // ListByEpoch method returns list of DataAuditResult IDs generated in // specified epoch. func ListByEpoch(epoch int) [][]byte { ctx := storage.GetReadOnlyContext() var buf interface{} = epoch it := storage.Find(ctx, buf.([]byte), storage.KeysOnly) return list(it) } // ListByCID method returns list of DataAuditResult IDs generated in // specified epoch for specified container. func ListByCID(epoch int, cid []byte) [][]byte { ctx := storage.GetReadOnlyContext() var buf interface{} = epoch prefix := append(buf.([]byte), cid...) it := storage.Find(ctx, prefix, storage.KeysOnly) return list(it) } // ListByNode method returns list of DataAuditResult IDs generated in // specified epoch for specified container by specified Inner Ring node. func ListByNode(epoch int, cid []byte, key interop.PublicKey) [][]byte { ctx := storage.GetReadOnlyContext() hdr := auditHeader{ epoch: epoch, cid: cid, from: key, } it := storage.Find(ctx, hdr.ID(), storage.KeysOnly) return list(it) } func list(it iterator.Iterator) [][]byte { var result [][]byte ignore := [][]byte{ []byte(netmapContractKey), []byte(notaryDisabledKey), } loop: for iterator.Next(it) { key := iterator.Value(it).([]byte) // iterator MUST BE `storage.KeysOnly` for _, ignoreKey := range ignore { if common.BytesEqual(key, ignoreKey) { continue loop } } result = append(result, key) } return result } // Version returns version of the contract. func Version() int { return common.Version } // readNext reads length from first byte and then reads data (max 127 bytes). func readNext(input []byte) ([]byte, int) { var buf interface{} = input[0] ln := buf.(int) return input[1 : 1+ln], 1 + ln } func newAuditHeader(input []byte) auditHeader { // V2 format offset := int(input[1]) offset = 2 + offset + 1 // version prefix + version len + epoch prefix var buf interface{} = input[offset : offset+8] // [ 8 integer bytes ] epoch := buf.(int) offset = offset + 8 // cid is a nested structure with raw bytes // [ cid struct prefix (wireType + len = 2 bytes), cid value wireType (1 byte), ... ] cid, cidOffset := readNext(input[offset+2+1:]) // key is a raw byte // [ public key wireType (1 byte), ... ] key, _ := readNext(input[offset+2+1+cidOffset+1:]) return auditHeader{ epoch, cid, key, } }