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croc
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Streaming encryption and hashing and update UI 

Fixes #19
Fixes #18
This commit is contained in:
Zack Scholl 2017-10-20 06:25:48 -06:00
parent 1c21c66f6f
commit c3cd3d6039
4 changed files with 170 additions and 61 deletions
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107
connect.go
View File

@ -5,7 +5,6 @@ import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"math"
"net"
"os"
@ -15,6 +14,7 @@ import (
"time"
"github.com/gosuri/uiprogress"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
)
@ -32,12 +32,9 @@ type Connection struct {
}
type FileMetaData struct {
Name string
Size int
Hash string
IV string
Salt string
bytes []byte
Name string
Size int
Hash string
}
func NewConnection(flags *Flags) *Connection {
@ -65,15 +62,14 @@ func NewConnection(flags *Flags) *Connection {
return c
}
func (c *Connection) Run() {
func (c *Connection) Run() error {
forceSingleThreaded := false
if c.IsSender {
fdata, err := ioutil.ReadFile(c.File.Name)
fsize, err := FileSize(c.File.Name)
if err != nil {
log.Fatal(err)
return
return err
}
if len(fdata) < MAX_NUMBER_THREADS*BUFFERSIZE {
if fsize < MAX_NUMBER_THREADS*BUFFERSIZE {
forceSingleThreaded = true
log.Debug("forcing single thread")
}
@ -113,29 +109,34 @@ func (c *Connection) Run() {
c.NumberOfConnections, _ = strconv.Atoi(strings.Split(c.Code, "-")[0])
if c.IsSender {
// encrypt the file
log.Debug("encrypting...")
fdata, err := ioutil.ReadFile(c.File.Name)
if c.DontEncrypt {
// don't encrypt
CopyFile(c.File.Name, c.File.Name+".enc")
} else {
// encrypt
log.Debug("encrypting...")
if err := EncryptFile(c.File.Name, c.File.Name+".enc", c.Code); err != nil {
return err
}
}
// get file hash
var err error
c.File.Hash, err = HashFile(c.File.Name)
if err != nil {
log.Fatal(err)
return
return err
}
c.File.bytes, c.File.Salt, c.File.IV = Encrypt(fdata, c.Code, c.DontEncrypt)
log.Debug("...finished encryption")
c.File.Hash = HashBytes(fdata)
c.File.Size = len(c.File.bytes)
if c.Debug {
ioutil.WriteFile(c.File.Name+".encrypted", c.File.bytes, 0644)
// get file size
c.File.Size, err = FileSize(c.File.Name + ".enc")
if err != nil {
return err
}
fmt.Printf("Sending %d byte file named '%s'\n", c.File.Size, c.File.Name)
fmt.Printf("Code is: %s\n", c.Code)
}
c.runClient()
return c.runClient()
}
// runClient spawns threads for parallel uplink/downlink via TCP
func (c *Connection) runClient() {
func (c *Connection) runClient() error {
logger := log.WithFields(log.Fields{
"code": c.Code,
"sender?": c.IsSender,
@ -177,12 +178,12 @@ func (c *Connection) runClient() {
sendMessage("r."+c.HashedCode+".0.0.0", connection)
}
if c.IsSender { // this is a sender
if id == 0 {
fmt.Printf("\nSending (<-%s)..\n", connection.RemoteAddr().String())
}
logger.Debug("waiting for ok from relay")
message = receiveMessage(connection)
logger.Debug("got ok from relay")
if id == 0 {
fmt.Printf("\nSending (->%s)..\n", message)
}
// wait for pipe to be made
time.Sleep(100 * time.Millisecond)
// Write data from file
@ -192,7 +193,7 @@ func (c *Connection) runClient() {
logger.Debug("waiting for meta data from sender")
message = receiveMessage(connection)
m := strings.Split(message, "-")
encryptedData, salt, iv := m[0], m[1], m[2]
encryptedData, salt, iv, sendersAddress := m[0], m[1], m[2], m[3]
encryptedBytes, err := hex.DecodeString(encryptedData)
if err != nil {
log.Error(err)
@ -233,6 +234,7 @@ func (c *Connection) runClient() {
} else {
sendMessage("ok", connection)
logger.Debug("receive file")
fmt.Printf("\n\nReceiving (<-%s)..\n", sendersAddress)
c.receiveFile(id, connection)
}
}
@ -242,36 +244,32 @@ func (c *Connection) runClient() {
if !c.IsSender {
if !gotOK {
return
return errors.New("Transfer interrupted")
}
c.catFile(c.File.Name)
encrypted, err := ioutil.ReadFile(c.File.Name + ".encrypted")
if err != nil {
log.Error(err)
return
}
fmt.Println("\n\ndecrypting...")
log.Debugf("Code: [%s]", c.Code)
log.Debugf("Salt: [%s]", c.File.Salt)
log.Debugf("IV: [%s]", c.File.IV)
decrypted, err := Decrypt(encrypted, c.Code, c.File.Salt, c.File.IV, c.DontEncrypt)
if err != nil {
log.Error(err)
return
}
log.Debugf("writing %d bytes to %s", len(decrypted), c.File.Name)
err = ioutil.WriteFile(c.File.Name, decrypted, 0644)
if err != nil {
log.Error(err)
if c.DontEncrypt {
if err := CopyFile(c.File.Name+".enc", c.File.Name); err != nil {
return err
}
} else {
if err := DecryptFile(c.File.Name+".enc", c.File.Name, c.Code); err != nil {
return errors.Wrap(err, "Problem decrypting file")
}
}
if !c.Debug {
os.Remove(c.File.Name + ".encrypted")
os.Remove(c.File.Name + ".enc")
}
log.Debugf("\n\n\ndownloaded hash: [%s]", HashBytes(decrypted))
fileHash, err := HashFile(c.File.Name)
if err != nil {
log.Error(err)
}
log.Debugf("\n\n\ndownloaded hash: [%s]", fileHash)
log.Debugf("\n\n\nrelayed hash: [%s]", c.File.Hash)
if c.File.Hash != HashBytes(decrypted) {
fmt.Printf("\nUh oh! %s is corrupted! Sorry, try again.\n", c.File.Name)
if c.File.Hash != fileHash {
return fmt.Errorf("\nUh oh! %s is corrupted! Sorry, try again.\n", c.File.Name)
} else {
fmt.Printf("\nReceived file written to %s", c.File.Name)
}
@ -279,6 +277,7 @@ func (c *Connection) runClient() {
fmt.Println("File sent.")
// TODO: Add confirmation
}
return nil
}
func fileAlreadyExists(s []string, f string) bool {
@ -293,7 +292,7 @@ func fileAlreadyExists(s []string, f string) bool {
func (c *Connection) catFile(fname string) {
// cat the file
os.Remove(fname)
finished, err := os.Create(fname + ".encrypted")
finished, err := os.Create(fname + ".enc")
defer finished.Close()
if err != nil {
log.Fatal(err)

7
main.go
View File

@ -32,7 +32,7 @@ func main() {
/~____ =ø= /
(______)__m_m)
croc version `+version+`
croc version ` + version + `
`)
flags := new(Flags)
flag.BoolVar(&flags.Relay, "relay", false, "run as relay")
@ -50,7 +50,10 @@ croc version `+version+`
r.Run()
} else {
c := NewConnection(flags)
c.Run()
err := c.Run()
if err != nil {
fmt.Printf("Error! Please submit the following error to https://github.com/schollz/croc/issues:\n\n'%s'\n\n", err.Error())
}
}
}

16
relay.go
View File

@ -114,9 +114,11 @@ func (r *Relay) clientCommuncation(id int, connection net.Conn) {
r.connections.sender[key] = connection
r.connections.Unlock()
// wait for receiver
receiversAddress := ""
for {
r.connections.RLock()
if _, ok := r.connections.reciever[key]; ok {
receiversAddress = r.connections.reciever[key].RemoteAddr().String()
logger.Debug("got reciever")
r.connections.RUnlock()
break
@ -125,7 +127,7 @@ func (r *Relay) clientCommuncation(id int, connection net.Conn) {
time.Sleep(100 * time.Millisecond)
}
logger.Debug("telling sender ok")
sendMessage("ok", connection)
sendMessage(receiversAddress, connection)
logger.Debug("preparing pipe")
r.connections.Lock()
con1 := r.connections.sender[key]
@ -142,19 +144,23 @@ func (r *Relay) clientCommuncation(id int, connection net.Conn) {
logger.Debug("deleted sender and receiver")
} else {
// wait for sender's metadata
sendersAddress := ""
for {
r.connections.RLock()
if _, ok := r.connections.metadata[key]; ok {
logger.Debug("got sender meta data")
r.connections.RUnlock()
break
if _, ok2 := r.connections.sender[key]; ok2 {
sendersAddress = r.connections.sender[key].RemoteAddr().String()
logger.Debug("got sender meta data")
r.connections.RUnlock()
break
}
}
r.connections.RUnlock()
time.Sleep(100 * time.Millisecond)
}
// send meta data
r.connections.RLock()
sendMessage(r.connections.metadata[key], connection)
sendMessage(r.connections.metadata[key]+"-"+sendersAddress, connection)
r.connections.RUnlock()
// check for receiver's consent
consent := receiveMessage(connection)

101
utils.go Normal file
View File

@ -0,0 +1,101 @@
package main
import (
"crypto/md5"
"fmt"
"io"
"os"
)
// CopyFile copies a file from src to dst. If src and dst files exist, and are
// the same, then return success. Otherise, attempt to create a hard link
// between the two files. If that fail, copy the file contents from src to dst.
func CopyFile(src, dst string) (err error) {
sfi, err := os.Stat(src)
if err != nil {
return
}
if !sfi.Mode().IsRegular() {
// cannot copy non-regular files (e.g., directories,
// symlinks, devices, etc.)
return fmt.Errorf("CopyFile: non-regular source file %s (%q)", sfi.Name(), sfi.Mode().String())
}
dfi, err := os.Stat(dst)
if err != nil {
if !os.IsNotExist(err) {
return
}
} else {
if !(dfi.Mode().IsRegular()) {
return fmt.Errorf("CopyFile: non-regular destination file %s (%q)", dfi.Name(), dfi.Mode().String())
}
if os.SameFile(sfi, dfi) {
return
}
}
if err = os.Link(src, dst); err == nil {
return
}
err = copyFileContents(src, dst)
return
}
// copyFileContents copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file.
func copyFileContents(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
cerr := out.Close()
if err == nil {
err = cerr
}
}()
if _, err = io.Copy(out, in); err != nil {
return
}
err = out.Sync()
return
}
// HashFile does a md5 hash on the file
// from https://golang.org/pkg/crypto/md5/#example_New_file
func HashFile(filename string) (hash string, err error) {
f, err := os.Open(filename)
if err != nil {
return
}
defer f.Close()
h := md5.New()
if _, err = io.Copy(h, f); err != nil {
return
}
hash = fmt.Sprintf("%x", h.Sum(nil))
return
}
// FileSize returns the size of a file
func FileSize(filename string) (int, error) {
f, err := os.Open(filename)
if err != nil {
return -1, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return -1, err
}
size := int(fi.Size())
return size, nil
}