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key_distribution.go
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/
key_distribution.go
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package main
import (
"encoding/gob"
"os"
"path"
"sync"
"time"
"github.com/pp2p/paranoid/libpfs/encryption"
log "github.com/pp2p/paranoid/logger"
"github.com/pp2p/pfsd/globals"
"github.com/pp2p/pfsd/keyman"
"github.com/pp2p/pfsd/pnetclient"
)
const unlockQueryInterval time.Duration = time.Second * 10
const unlockTimeout time.Duration = time.Minute * 10
const lockWaitDuration time.Duration = time.Minute * 1
type keyResponse struct {
uuid string
piece *keyman.KeyPiece
}
func requestKeyPiece(uuid string, generation int64, recievedPieceChan chan keyResponse) {
piece, err := pnetclient.RequestKeyPiece(uuid, generation)
if err != nil {
log.Errorf("Error requesting key piece from node %s: %s", uuid, err)
return
}
recievedPieceChan <- keyResponse{
uuid: uuid,
piece: piece,
}
}
// Unlock the state machine. This might fail terribly
func Unlock() {
timer := time.NewTimer(0)
defer timer.Stop()
timeout := time.After(unlockTimeout)
generation := keyman.StateMachine.GetCurrentGeneration()
if generation == -1 {
log.Fatal("Failed to unlock system, not part of a generation")
}
peers, err := keyman.StateMachine.GetNodes(generation)
if err != nil {
log.Fatal("Failed to unlock system:", err)
}
for i := 0; i < len(peers); i++ {
if peers[i] == globals.ThisNode.UUID {
peers = append(peers[:i], peers[i+1:]...)
break
}
}
var pieces []*keyman.KeyPiece
pieces = append(pieces, globals.HeldKeyPieces.GetPiece(generation, globals.ThisNode.UUID))
recievedPieceChan := make(chan keyResponse, len(peers))
var keyRequestWait sync.WaitGroup
for {
select {
case <-timeout:
log.Fatal("Failed to unlock system before timeout")
case <-timer.C:
if len(peers) == 0 {
log.Fatal("No peers to request peers from")
}
for i := 0; i < len(peers); i++ {
keyRequestWait.Add(1)
x := i
go func() {
defer keyRequestWait.Done()
requestKeyPiece(peers[x], generation, recievedPieceChan)
}()
}
timer.Reset(unlockQueryInterval)
case keyData := <-recievedPieceChan:
for i := 0; i < len(peers); i++ {
if peers[i] == keyData.uuid {
pieces = append(pieces, keyData.piece)
peers = append(peers[:i], peers[i+1:]...)
key, err := keyman.RebuildKey(pieces)
if err != nil {
log.Warn("Could not rebuild key:", err)
break
}
globals.EncryptionKey = key
cipherB, err := encryption.GenerateAESCipherBlock(globals.EncryptionKey.GetBytes())
if err != nil {
log.Fatal("unable to generate cipher block:", err)
}
encryption.SetCipher(cipherB)
done := make(chan bool, 1)
go func() {
keyRequestWait.Wait()
done <- true
}()
for {
select {
case <-recievedPieceChan:
case <-done:
log.Info("Successfully unlocked system.")
return
}
}
}
}
}
}
}
// LoadPieces from the meta directory
func LoadPieces() {
if _, err := os.Stat(path.Join(globals.ParanoidDir, "meta", "pieces")); os.IsNotExist(err) {
log.Info("Filesystem not locked. Will not attepmt to load KeyPieces.")
return
}
piecePath := path.Join(globals.ParanoidDir, "meta", "pieces")
file, err := os.Open(piecePath)
if err != nil {
// If the file doesn't exist, ignore it, because it could just be the first run.
if os.IsNotExist(err) {
log.V(1).Infof("KeyPiece GOB file %s does not exist.", piecePath)
return
}
log.Fatalf("Unable to open %s for reading pieces: %s", piecePath, file)
}
defer file.Close()
dec := gob.NewDecoder(file)
err = dec.Decode(&globals.HeldKeyPieces)
if err != nil {
log.Fatal("Failed decoding GOB KeyPiece data:", err)
}
}