mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2024-12-23 04:03:49 +00:00
0be3044b7e
* rename * rename "make grpc" * rename "abi bindings templates" * rename "abi bindings templates"
393 lines
9.7 KiB
Go
393 lines
9.7 KiB
Go
// Copyright 2018 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package dnsdisc
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/ecdsa"
|
|
"encoding/base32"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/ledgerwatch/erigon/crypto"
|
|
"github.com/ledgerwatch/erigon/p2p/enode"
|
|
"github.com/ledgerwatch/erigon/p2p/enr"
|
|
"github.com/ledgerwatch/erigon/rlp"
|
|
"golang.org/x/crypto/sha3"
|
|
)
|
|
|
|
// Tree is a merkle tree of node records.
|
|
type Tree struct {
|
|
root *rootEntry
|
|
entries map[string]entry
|
|
}
|
|
|
|
// Sign signs the tree with the given private key and sets the sequence number.
|
|
func (t *Tree) Sign(key *ecdsa.PrivateKey, domain string) (url string, err error) {
|
|
root := *t.root
|
|
sig, err := crypto.Sign(root.sigHash(), key)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
root.sig = sig
|
|
t.root = &root
|
|
link := newLinkEntry(domain, &key.PublicKey)
|
|
return link.String(), nil
|
|
}
|
|
|
|
// SetSignature verifies the given signature and assigns it as the tree's current
|
|
// signature if valid.
|
|
func (t *Tree) SetSignature(pubkey *ecdsa.PublicKey, signature string) error {
|
|
sig, err := b64format.DecodeString(signature)
|
|
if err != nil || len(sig) != crypto.SignatureLength {
|
|
return errInvalidSig
|
|
}
|
|
root := *t.root
|
|
root.sig = sig
|
|
if !root.verifySignature(pubkey) {
|
|
return errInvalidSig
|
|
}
|
|
t.root = &root
|
|
return nil
|
|
}
|
|
|
|
// Seq returns the sequence number of the tree.
|
|
func (t *Tree) Seq() uint {
|
|
return t.root.seq
|
|
}
|
|
|
|
// Signature returns the signature of the tree.
|
|
func (t *Tree) Signature() string {
|
|
return b64format.EncodeToString(t.root.sig)
|
|
}
|
|
|
|
// ToTXT returns all DNS TXT records required for the tree.
|
|
func (t *Tree) ToTXT(domain string) map[string]string {
|
|
records := map[string]string{domain: t.root.String()}
|
|
for _, e := range t.entries {
|
|
sd := subdomain(e)
|
|
if domain != "" {
|
|
sd = sd + "." + domain
|
|
}
|
|
records[sd] = e.String()
|
|
}
|
|
return records
|
|
}
|
|
|
|
// Links returns all links contained in the tree.
|
|
func (t *Tree) Links() []string {
|
|
var links []string
|
|
for _, e := range t.entries {
|
|
if le, ok := e.(*linkEntry); ok {
|
|
links = append(links, le.String())
|
|
}
|
|
}
|
|
return links
|
|
}
|
|
|
|
// Nodes returns all nodes contained in the tree.
|
|
func (t *Tree) Nodes() []*enode.Node {
|
|
var nodes []*enode.Node
|
|
for _, e := range t.entries {
|
|
if ee, ok := e.(*enrEntry); ok {
|
|
nodes = append(nodes, ee.node)
|
|
}
|
|
}
|
|
return nodes
|
|
}
|
|
|
|
const (
|
|
hashAbbrev = 16
|
|
maxChildren = 300 / hashAbbrev * (13 / 8)
|
|
minHashLength = 12
|
|
)
|
|
|
|
// MakeTree creates a tree containing the given nodes and links.
|
|
func MakeTree(seq uint, nodes []*enode.Node, links []string) (*Tree, error) {
|
|
// Sort records by ID and ensure all nodes have a valid record.
|
|
records := make([]*enode.Node, len(nodes))
|
|
|
|
copy(records, nodes)
|
|
sortByID(records)
|
|
for _, n := range records {
|
|
if len(n.Record().Signature()) == 0 {
|
|
return nil, fmt.Errorf("can't add node %v: unsigned node record", n.ID())
|
|
}
|
|
}
|
|
|
|
// Create the leaf list.
|
|
enrEntries := make([]entry, len(records))
|
|
for i, r := range records {
|
|
enrEntries[i] = &enrEntry{r}
|
|
}
|
|
linkEntries := make([]entry, len(links))
|
|
for i, l := range links {
|
|
le, err := parseLink(l)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
linkEntries[i] = le
|
|
}
|
|
|
|
// Create intermediate nodes.
|
|
t := &Tree{entries: make(map[string]entry)}
|
|
eroot := t.build(enrEntries)
|
|
t.entries[subdomain(eroot)] = eroot
|
|
lroot := t.build(linkEntries)
|
|
t.entries[subdomain(lroot)] = lroot
|
|
t.root = &rootEntry{seq: seq, eroot: subdomain(eroot), lroot: subdomain(lroot)}
|
|
return t, nil
|
|
}
|
|
|
|
func (t *Tree) build(entries []entry) entry {
|
|
if len(entries) == 1 {
|
|
return entries[0]
|
|
}
|
|
if len(entries) <= maxChildren {
|
|
hashes := make([]string, len(entries))
|
|
for i, e := range entries {
|
|
hashes[i] = subdomain(e)
|
|
t.entries[hashes[i]] = e
|
|
}
|
|
return &branchEntry{hashes}
|
|
}
|
|
var subtrees []entry
|
|
for len(entries) > 0 {
|
|
n := maxChildren
|
|
if len(entries) < n {
|
|
n = len(entries)
|
|
}
|
|
sub := t.build(entries[:n])
|
|
entries = entries[n:]
|
|
subtrees = append(subtrees, sub)
|
|
t.entries[subdomain(sub)] = sub
|
|
}
|
|
return t.build(subtrees)
|
|
}
|
|
|
|
func sortByID(nodes []*enode.Node) []*enode.Node {
|
|
sort.Slice(nodes, func(i, j int) bool {
|
|
return bytes.Compare(nodes[i].ID().Bytes(), nodes[j].ID().Bytes()) < 0
|
|
})
|
|
return nodes
|
|
}
|
|
|
|
// Entry Types
|
|
|
|
type entry interface {
|
|
fmt.Stringer
|
|
}
|
|
|
|
type (
|
|
rootEntry struct {
|
|
eroot string
|
|
lroot string
|
|
seq uint
|
|
sig []byte
|
|
}
|
|
branchEntry struct {
|
|
children []string
|
|
}
|
|
enrEntry struct {
|
|
node *enode.Node
|
|
}
|
|
linkEntry struct {
|
|
str string
|
|
domain string
|
|
pubkey *ecdsa.PublicKey
|
|
}
|
|
)
|
|
|
|
// Entry Encoding
|
|
|
|
var (
|
|
b32format = base32.StdEncoding.WithPadding(base32.NoPadding)
|
|
b64format = base64.RawURLEncoding
|
|
)
|
|
|
|
const (
|
|
rootPrefix = "enrtree-root:v1"
|
|
linkPrefix = "enrtree://"
|
|
branchPrefix = "enrtree-branch:"
|
|
enrPrefix = "enr:"
|
|
)
|
|
|
|
func subdomain(e entry) string {
|
|
h := sha3.NewLegacyKeccak256()
|
|
io.WriteString(h, e.String())
|
|
return b32format.EncodeToString(h.Sum(nil)[:16])
|
|
}
|
|
|
|
func (e *rootEntry) String() string {
|
|
return fmt.Sprintf(rootPrefix+" e=%s l=%s seq=%d sig=%s", e.eroot, e.lroot, e.seq, b64format.EncodeToString(e.sig))
|
|
}
|
|
|
|
func (e *rootEntry) sigHash() []byte {
|
|
h := sha3.NewLegacyKeccak256()
|
|
fmt.Fprintf(h, rootPrefix+" e=%s l=%s seq=%d", e.eroot, e.lroot, e.seq)
|
|
return h.Sum(nil)
|
|
}
|
|
|
|
func (e *rootEntry) verifySignature(pubkey *ecdsa.PublicKey) bool {
|
|
sig := e.sig[:crypto.RecoveryIDOffset] // remove recovery id
|
|
enckey := crypto.FromECDSAPub(pubkey)
|
|
return crypto.VerifySignature(enckey, e.sigHash(), sig)
|
|
}
|
|
|
|
func (e *branchEntry) String() string {
|
|
return branchPrefix + strings.Join(e.children, ",")
|
|
}
|
|
|
|
func (e *enrEntry) String() string {
|
|
return e.node.String()
|
|
}
|
|
|
|
func (e *linkEntry) String() string {
|
|
return linkPrefix + e.str
|
|
}
|
|
|
|
func newLinkEntry(domain string, pubkey *ecdsa.PublicKey) *linkEntry {
|
|
key := b32format.EncodeToString(crypto.CompressPubkey(pubkey))
|
|
str := key + "@" + domain
|
|
return &linkEntry{str, domain, pubkey}
|
|
}
|
|
|
|
// Entry Parsing
|
|
|
|
func parseEntry(e string, validSchemes enr.IdentityScheme) (entry, error) {
|
|
switch {
|
|
case strings.HasPrefix(e, linkPrefix):
|
|
return parseLinkEntry(e)
|
|
case strings.HasPrefix(e, branchPrefix):
|
|
return parseBranch(e)
|
|
case strings.HasPrefix(e, enrPrefix):
|
|
return parseENR(e, validSchemes)
|
|
default:
|
|
return nil, errUnknownEntry
|
|
}
|
|
}
|
|
|
|
func parseRoot(e string) (rootEntry, error) {
|
|
var eroot, lroot, sig string
|
|
var seq uint
|
|
if _, err := fmt.Sscanf(e, rootPrefix+" e=%s l=%s seq=%d sig=%s", &eroot, &lroot, &seq, &sig); err != nil {
|
|
return rootEntry{}, entryError{"root", errSyntax}
|
|
}
|
|
if !isValidHash(eroot) || !isValidHash(lroot) {
|
|
return rootEntry{}, entryError{"root", errInvalidChild}
|
|
}
|
|
sigb, err := b64format.DecodeString(sig)
|
|
if err != nil || len(sigb) != crypto.SignatureLength {
|
|
return rootEntry{}, entryError{"root", errInvalidSig}
|
|
}
|
|
return rootEntry{eroot, lroot, seq, sigb}, nil
|
|
}
|
|
|
|
func parseLinkEntry(e string) (entry, error) {
|
|
le, err := parseLink(e)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return le, nil
|
|
}
|
|
|
|
func parseLink(e string) (*linkEntry, error) {
|
|
if !strings.HasPrefix(e, linkPrefix) {
|
|
return nil, fmt.Errorf("wrong/missing scheme 'enrtree' in URL")
|
|
}
|
|
e = e[len(linkPrefix):]
|
|
pos := strings.IndexByte(e, '@')
|
|
if pos == -1 {
|
|
return nil, entryError{"link", errNoPubkey}
|
|
}
|
|
keystring, domain := e[:pos], e[pos+1:]
|
|
keybytes, err := b32format.DecodeString(keystring)
|
|
if err != nil {
|
|
return nil, entryError{"link", errBadPubkey}
|
|
}
|
|
key, err := crypto.DecompressPubkey(keybytes)
|
|
if err != nil {
|
|
return nil, entryError{"link", errBadPubkey}
|
|
}
|
|
return &linkEntry{e, domain, key}, nil
|
|
}
|
|
|
|
func parseBranch(e string) (entry, error) {
|
|
e = e[len(branchPrefix):]
|
|
if e == "" {
|
|
return &branchEntry{}, nil // empty entry is OK
|
|
}
|
|
hashes := make([]string, 0, strings.Count(e, ","))
|
|
for _, c := range strings.Split(e, ",") {
|
|
if !isValidHash(c) {
|
|
return nil, entryError{"branch", errInvalidChild}
|
|
}
|
|
hashes = append(hashes, c)
|
|
}
|
|
return &branchEntry{hashes}, nil
|
|
}
|
|
|
|
func parseENR(e string, validSchemes enr.IdentityScheme) (entry, error) {
|
|
e = e[len(enrPrefix):]
|
|
enc, err := b64format.DecodeString(e)
|
|
if err != nil {
|
|
return nil, entryError{"enr", errInvalidENR}
|
|
}
|
|
var rec enr.Record
|
|
if err := rlp.DecodeBytes(enc, &rec); err != nil {
|
|
return nil, entryError{"enr", err}
|
|
}
|
|
n, err := enode.New(validSchemes, &rec)
|
|
if err != nil {
|
|
return nil, entryError{"enr", err}
|
|
}
|
|
return &enrEntry{n}, nil
|
|
}
|
|
|
|
func isValidHash(s string) bool {
|
|
dlen := b32format.DecodedLen(len(s))
|
|
if dlen < minHashLength || dlen > 32 || strings.ContainsAny(s, "\n\r") {
|
|
return false
|
|
}
|
|
buf := make([]byte, 32)
|
|
_, err := b32format.Decode(buf, []byte(s))
|
|
return err == nil
|
|
}
|
|
|
|
// truncateHash truncates the given base32 hash string to the minimum acceptable length.
|
|
func truncateHash(hash string) string {
|
|
maxLen := b32format.EncodedLen(minHashLength)
|
|
if len(hash) < maxLen {
|
|
panic(fmt.Errorf("dnsdisc: hash %q is too short", hash))
|
|
}
|
|
return hash[:maxLen]
|
|
}
|
|
|
|
// URL encoding
|
|
|
|
// ParseURL parses an enrtree:// URL and returns its components.
|
|
func ParseURL(url string) (domain string, pubkey *ecdsa.PublicKey, err error) {
|
|
le, err := parseLink(url)
|
|
if err != nil {
|
|
return "", nil, err
|
|
}
|
|
return le.domain, le.pubkey, nil
|
|
}
|