forked from mirror/go-ethereum
swarm/pss: refactoring (#19110)
* swarm/pss: split pss and keystore * swarm/pss: moved whisper to keystore * swarm/pss: goimports fixedChrisChinchilla-patch-3
gluk256
6 years ago
committed by
Viktor Trón
parent
4f85c2b88b
commit
12ca3b172a
@ -0,0 +1,281 @@ |
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package pss |
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import ( |
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"crypto/ecdsa" |
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"errors" |
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"fmt" |
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"sync" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/crypto" |
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"github.com/ethereum/go-ethereum/metrics" |
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"github.com/ethereum/go-ethereum/swarm/log" |
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whisper "github.com/ethereum/go-ethereum/whisper/whisperv6" |
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) |
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type KeyStore struct { |
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w *whisper.Whisper // key and encryption backend
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mx sync.RWMutex |
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pubKeyPool map[string]map[Topic]*pssPeer // mapping of hex public keys to peer address by topic.
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symKeyPool map[string]map[Topic]*pssPeer // mapping of symkeyids to peer address by topic.
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symKeyDecryptCache []*string // fast lookup of symkeys recently used for decryption; last used is on top of stack
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symKeyDecryptCacheCursor int // modular cursor pointing to last used, wraps on symKeyDecryptCache array
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} |
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func loadKeyStore() *KeyStore { |
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return &KeyStore{ |
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w: whisper.New(&whisper.DefaultConfig), |
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pubKeyPool: make(map[string]map[Topic]*pssPeer), |
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symKeyPool: make(map[string]map[Topic]*pssPeer), |
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symKeyDecryptCache: make([]*string, defaultSymKeyCacheCapacity), |
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} |
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} |
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func (ks *KeyStore) isSymKeyStored(key string) bool { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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var ok bool |
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_, ok = ks.symKeyPool[key] |
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return ok |
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} |
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func (ks *KeyStore) isPubKeyStored(key string) bool { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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var ok bool |
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_, ok = ks.pubKeyPool[key] |
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return ok |
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} |
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func (ks *KeyStore) getPeerSym(symkeyid string, topic Topic) (*pssPeer, bool) { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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psp, ok := ks.symKeyPool[symkeyid][topic] |
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return psp, ok |
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} |
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func (ks *KeyStore) getPeerPub(pubkeyid string, topic Topic) (*pssPeer, bool) { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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psp, ok := ks.pubKeyPool[pubkeyid][topic] |
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return psp, ok |
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} |
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// Links a peer ECDSA public key to a topic.
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// This is required for asymmetric message exchange on the given topic.
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// The value in `address` will be used as a routing hint for the public key / topic association.
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func (ks *KeyStore) SetPeerPublicKey(pubkey *ecdsa.PublicKey, topic Topic, address PssAddress) error { |
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if err := validateAddress(address); err != nil { |
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return err |
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} |
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pubkeybytes := crypto.FromECDSAPub(pubkey) |
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if len(pubkeybytes) == 0 { |
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return fmt.Errorf("invalid public key: %v", pubkey) |
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} |
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pubkeyid := common.ToHex(pubkeybytes) |
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psp := &pssPeer{ |
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address: address, |
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} |
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ks.mx.Lock() |
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if _, ok := ks.pubKeyPool[pubkeyid]; !ok { |
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ks.pubKeyPool[pubkeyid] = make(map[Topic]*pssPeer) |
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} |
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ks.pubKeyPool[pubkeyid][topic] = psp |
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ks.mx.Unlock() |
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log.Trace("added pubkey", "pubkeyid", pubkeyid, "topic", topic, "address", address) |
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return nil |
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} |
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// adds a symmetric key to the pss key pool, and optionally adds the key to the
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// collection of keys used to attempt symmetric decryption of incoming messages
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func (ks *KeyStore) addSymmetricKeyToPool(keyid string, topic Topic, address PssAddress, addtocache bool, protected bool) { |
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psp := &pssPeer{ |
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address: address, |
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protected: protected, |
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} |
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ks.mx.Lock() |
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if _, ok := ks.symKeyPool[keyid]; !ok { |
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ks.symKeyPool[keyid] = make(map[Topic]*pssPeer) |
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} |
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ks.symKeyPool[keyid][topic] = psp |
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ks.mx.Unlock() |
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if addtocache { |
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ks.symKeyDecryptCacheCursor++ |
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ks.symKeyDecryptCache[ks.symKeyDecryptCacheCursor%cap(ks.symKeyDecryptCache)] = &keyid |
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} |
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} |
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// Returns all recorded topic and address combination for a specific public key
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func (ks *KeyStore) GetPublickeyPeers(keyid string) (topic []Topic, address []PssAddress, err error) { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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for t, peer := range ks.pubKeyPool[keyid] { |
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topic = append(topic, t) |
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address = append(address, peer.address) |
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} |
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return topic, address, nil |
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} |
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func (ks *KeyStore) getPeerAddress(keyid string, topic Topic) (PssAddress, error) { |
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ks.mx.RLock() |
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defer ks.mx.RUnlock() |
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if peers, ok := ks.pubKeyPool[keyid]; ok { |
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if t, ok := peers[topic]; ok { |
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return t.address, nil |
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} |
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} |
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return nil, fmt.Errorf("peer with pubkey %s, topic %x not found", keyid, topic) |
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} |
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// Attempt to decrypt, validate and unpack a symmetrically encrypted message.
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// If successful, returns the unpacked whisper ReceivedMessage struct
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// encapsulating the decrypted message, and the whisper backend id
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// of the symmetric key used to decrypt the message.
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// It fails if decryption of the message fails or if the message is corrupted.
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func (ks *KeyStore) processSym(envelope *whisper.Envelope) (*whisper.ReceivedMessage, string, PssAddress, error) { |
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metrics.GetOrRegisterCounter("pss.process.sym", nil).Inc(1) |
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for i := ks.symKeyDecryptCacheCursor; i > ks.symKeyDecryptCacheCursor-cap(ks.symKeyDecryptCache) && i > 0; i-- { |
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symkeyid := ks.symKeyDecryptCache[i%cap(ks.symKeyDecryptCache)] |
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symkey, err := ks.w.GetSymKey(*symkeyid) |
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if err != nil { |
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continue |
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} |
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recvmsg, err := envelope.OpenSymmetric(symkey) |
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if err != nil { |
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continue |
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} |
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if !recvmsg.ValidateAndParse() { |
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return nil, "", nil, errors.New("symmetrically encrypted message has invalid signature or is corrupt") |
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} |
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var from PssAddress |
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ks.mx.RLock() |
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if ks.symKeyPool[*symkeyid][Topic(envelope.Topic)] != nil { |
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from = ks.symKeyPool[*symkeyid][Topic(envelope.Topic)].address |
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} |
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ks.mx.RUnlock() |
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ks.symKeyDecryptCacheCursor++ |
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ks.symKeyDecryptCache[ks.symKeyDecryptCacheCursor%cap(ks.symKeyDecryptCache)] = symkeyid |
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return recvmsg, *symkeyid, from, nil |
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} |
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return nil, "", nil, errors.New("could not decrypt message") |
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} |
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// Attempt to decrypt, validate and unpack an asymmetrically encrypted message.
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// If successful, returns the unpacked whisper ReceivedMessage struct
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// encapsulating the decrypted message, and the byte representation of
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// the public key used to decrypt the message.
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// It fails if decryption of message fails, or if the message is corrupted.
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func (ks *Pss) processAsym(envelope *whisper.Envelope) (*whisper.ReceivedMessage, string, PssAddress, error) { |
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metrics.GetOrRegisterCounter("pss.process.asym", nil).Inc(1) |
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recvmsg, err := envelope.OpenAsymmetric(ks.privateKey) |
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if err != nil { |
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return nil, "", nil, fmt.Errorf("could not decrypt message: %s", err) |
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} |
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// check signature (if signed), strip padding
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if !recvmsg.ValidateAndParse() { |
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return nil, "", nil, errors.New("invalid message") |
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} |
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pubkeyid := common.ToHex(crypto.FromECDSAPub(recvmsg.Src)) |
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var from PssAddress |
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ks.mx.RLock() |
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if ks.pubKeyPool[pubkeyid][Topic(envelope.Topic)] != nil { |
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from = ks.pubKeyPool[pubkeyid][Topic(envelope.Topic)].address |
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} |
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ks.mx.RUnlock() |
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return recvmsg, pubkeyid, from, nil |
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} |
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// Symkey garbage collection
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// a key is removed if:
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// - it is not marked as protected
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// - it is not in the incoming decryption cache
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func (ks *Pss) cleanKeys() (count int) { |
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for keyid, peertopics := range ks.symKeyPool { |
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var expiredtopics []Topic |
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for topic, psp := range peertopics { |
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if psp.protected { |
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continue |
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} |
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var match bool |
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for i := ks.symKeyDecryptCacheCursor; i > ks.symKeyDecryptCacheCursor-cap(ks.symKeyDecryptCache) && i > 0; i-- { |
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cacheid := ks.symKeyDecryptCache[i%cap(ks.symKeyDecryptCache)] |
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if *cacheid == keyid { |
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match = true |
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} |
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} |
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if !match { |
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expiredtopics = append(expiredtopics, topic) |
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} |
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} |
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for _, topic := range expiredtopics { |
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ks.mx.Lock() |
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delete(ks.symKeyPool[keyid], topic) |
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log.Trace("symkey cleanup deletion", "symkeyid", keyid, "topic", topic, "val", ks.symKeyPool[keyid]) |
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ks.mx.Unlock() |
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count++ |
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} |
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} |
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return count |
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} |
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// Automatically generate a new symkey for a topic and address hint
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func (ks *KeyStore) GenerateSymmetricKey(topic Topic, address PssAddress, addToCache bool) (string, error) { |
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keyid, err := ks.w.GenerateSymKey() |
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if err == nil { |
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ks.addSymmetricKeyToPool(keyid, topic, address, addToCache, false) |
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} |
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return keyid, err |
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} |
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// Returns a symmetric key byte sequence stored in the whisper backend by its unique id.
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// Passes on the error value from the whisper backend.
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func (ks *KeyStore) GetSymmetricKey(symkeyid string) ([]byte, error) { |
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return ks.w.GetSymKey(symkeyid) |
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} |
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// Links a peer symmetric key (arbitrary byte sequence) to a topic.
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//
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// This is required for symmetrically encrypted message exchange on the given topic.
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//
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// The key is stored in the whisper backend.
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//
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// If addtocache is set to true, the key will be added to the cache of keys
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// used to attempt symmetric decryption of incoming messages.
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//
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// Returns a string id that can be used to retrieve the key bytes
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// from the whisper backend (see pss.GetSymmetricKey())
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func (ks *KeyStore) SetSymmetricKey(key []byte, topic Topic, address PssAddress, addtocache bool) (string, error) { |
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if err := validateAddress(address); err != nil { |
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return "", err |
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} |
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return ks.setSymmetricKey(key, topic, address, addtocache, true) |
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} |
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func (ks *KeyStore) setSymmetricKey(key []byte, topic Topic, address PssAddress, addtocache bool, protected bool) (string, error) { |
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keyid, err := ks.w.AddSymKeyDirect(key) |
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if err == nil { |
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ks.addSymmetricKeyToPool(keyid, topic, address, addtocache, protected) |
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} |
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return keyid, err |
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} |
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