package instance import ( "context" "crypto" "fmt" "net/http" "time" "git.sigsum.org/sigsum-lib-go/pkg/requests" "git.sigsum.org/sigsum-lib-go/pkg/types" "git.sigsum.org/sigsum-log-go/pkg/db" "git.sigsum.org/sigsum-log-go/pkg/dns" "git.sigsum.org/sigsum-log-go/pkg/state" ) // Config is a collection of log parameters type Config struct { LogID string // H(public key), then hex-encoded TreeID int64 // Merkle tree identifier used by Trillian Prefix string // The portion between base URL and st/v0 (may be "") MaxRange int64 // Maximum number of leaves per get-leaves request Deadline time.Duration // Deadline used for gRPC requests Interval time.Duration // Cosigning frequency ShardStart uint64 // Shard interval start (num seconds since UNIX epoch) // Witnesses map trusted witness identifiers to public verification keys Witnesses map[types.Hash]types.PublicKey } // Instance is an instance of the log's front-end type Instance struct { Config // configuration parameters Client db.Client // provides access to the Trillian backend Signer crypto.Signer // provides access to Ed25519 private key Stateman state.StateManager // coordinates access to (co)signed tree heads DNS dns.Verifier // checks if domain name knows a public key } // Handlers returns a list of sigsum handlers func (i *Instance) Handlers() []Handler { return []Handler{ Handler{Instance: i, Handler: addLeaf, Endpoint: types.EndpointAddLeaf, Method: http.MethodPost}, Handler{Instance: i, Handler: addCosignature, Endpoint: types.EndpointAddCosignature, Method: http.MethodPost}, Handler{Instance: i, Handler: getTreeHeadToCosign, Endpoint: types.EndpointGetTreeHeadToSign, Method: http.MethodGet}, // XXX: ToCosign Handler{Instance: i, Handler: getTreeHeadCosigned, Endpoint: types.EndpointGetTreeHeadCosigned, Method: http.MethodGet}, Handler{Instance: i, Handler: getCheckpoint, Endpoint: types.Endpoint("get-checkpoint"), Method: http.MethodGet}, Handler{Instance: i, Handler: getConsistencyProof, Endpoint: types.EndpointGetConsistencyProof, Method: http.MethodPost}, Handler{Instance: i, Handler: getInclusionProof, Endpoint: types.EndpointGetInclusionProof, Method: http.MethodPost}, Handler{Instance: i, Handler: getLeaves, Endpoint: types.EndpointGetLeaves, Method: http.MethodPost}, } } // checkHTTPMethod checks if an HTTP method is supported func (i *Instance) checkHTTPMethod(m string) bool { return m == http.MethodGet || m == http.MethodPost } func (i *Instance) leafRequestFromHTTP(ctx context.Context, r *http.Request) (*requests.Leaf, error) { var req requests.Leaf if err := req.FromASCII(r.Body); err != nil { return nil, fmt.Errorf("FromASCII: %v", err) } stmt := types.Statement{ ShardHint: req.ShardHint, Checksum: *types.HashFn(req.Preimage[:]), } if !stmt.Verify(&req.VerificationKey, &req.Signature) { return nil, fmt.Errorf("invalid signature") } shardEnd := uint64(time.Now().Unix()) if req.ShardHint < i.ShardStart { return nil, fmt.Errorf("invalid shard hint: %d not in [%d, %d]", req.ShardHint, i.ShardStart, shardEnd) } if req.ShardHint > shardEnd { return nil, fmt.Errorf("invalid shard hint: %d not in [%d, %d]", req.ShardHint, i.ShardStart, shardEnd) } if err := i.DNS.Verify(ctx, req.DomainHint, &req.VerificationKey); err != nil { return nil, fmt.Errorf("invalid domain hint: %v", err) } return &req, nil } func (i *Instance) cosignatureRequestFromHTTP(r *http.Request) (*requests.Cosignature, error) { var req requests.Cosignature if err := req.FromASCII(r.Body); err != nil { return nil, fmt.Errorf("FromASCII: %v", err) } if _, ok := i.Witnesses[req.KeyHash]; !ok { return nil, fmt.Errorf("Unknown witness: %x", req.KeyHash) } return &req, nil } func (i *Instance) consistencyProofRequestFromHTTP(r *http.Request) (*requests.ConsistencyProof, error) { var req requests.ConsistencyProof if err := req.FromASCII(r.Body); err != nil { return nil, fmt.Errorf("FromASCII: %v", err) } if req.OldSize < 1 { return nil, fmt.Errorf("OldSize(%d) must be larger than zero", req.OldSize) } if req.NewSize <= req.OldSize { return nil, fmt.Errorf("NewSize(%d) must be larger than OldSize(%d)", req.NewSize, req.OldSize) } return &req, nil } func (i *Instance) inclusionProofRequestFromHTTP(r *http.Request) (*requests.InclusionProof, error) { var req requests.InclusionProof if err := req.FromASCII(r.Body); err != nil { return nil, fmt.Errorf("FromASCII: %v", err) } if req.TreeSize < 2 { // TreeSize:0 => not possible to prove inclusion of anything // TreeSize:1 => you don't need an inclusion proof (it is always empty) return nil, fmt.Errorf("TreeSize(%d) must be larger than one", req.TreeSize) } return &req, nil } func (i *Instance) leavesRequestFromHTTP(r *http.Request) (*requests.Leaves, error) { var req requests.Leaves if err := req.FromASCII(r.Body); err != nil { return nil, fmt.Errorf("FromASCII: %v", err) } if req.StartSize > req.EndSize { return nil, fmt.Errorf("StartSize(%d) must be less than or equal to EndSize(%d)", req.StartSize, req.EndSize) } if req.EndSize-req.StartSize+1 > uint64(i.MaxRange) { req.EndSize = req.StartSize + uint64(i.MaxRange) - 1 } return &req, nil }