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Praise Bob! 

Signed-off-by: Russ Magee <rmagee@gmail.com>
This commit is contained in:
Russ Magee 2018-12-08 21:44:06 -08:00
parent 9641fd3fff
commit a0e90c14ba
2 changed files with 145 additions and 144 deletions
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142
hkexnet/hkexnet.go
View File

@ -42,7 +42,6 @@ import (
"math/big"
"math/rand"
"net"
"os"
"strings"
"sync"
"time"
@ -56,32 +55,6 @@ import (
const PAD_SZ = 32 // max size of padding applied to each packet
const HMAC_CHK_SZ = 4 // leading bytes of HMAC to xmit for verification
const Bob = string("\r\n\r\n" +
"@@@@@@@^^~~~~~~~~~~~~~~~~~~~~^@@@@@@@@@\r\n" +
"@@@@@@^ ~^ @ @@ @ @ @ I ~^@@@@@@\r\n" +
"@@@@@ ~ ~~ ~I @@@@@\r\n" +
"@@@@' ' _,w@< @@@@\r\n" +
"@@@@ @@@@@@@@w___,w@@@@@@@@ @ @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@@@ I @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@*@[ i @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@[][ | ]@@@\r\n" +
"@@@@ ~_,,_ ~@@@@@@@~ ____~ @ @@@\r\n" +
"@@@@ _~ , , `@@@~ _ _`@ ]L J@@@\r\n" +
"@@@@ , @@w@ww+ @@@ww``,,@w@ ][ @@@@\r\n" +
"@@@@, @@@@www@@@ @@@@@@@ww@@@@@[ @@@@\r\n" +
"@@@@@_|| @@@@@@P' @@P@@@@@@@@@@@[|c@@@@\r\n" +
"@@@@@@w| '@@P~ P]@@@-~, ~Y@@^'],@@@@@@\r\n" +
"@@@@@@@[ _ _J@@Tk ]]@@@@@@\r\n" +
"@@@@@@@@,@ @@, c,,,,,,,y ,w@@[ ,@@@@@@@\r\n" +
"@@@@@@@@@ i @w ====--_@@@@@ @@@@@@@@\r\n" +
"@@@@@@@@@@`,P~ _ ~^^^^Y@@@@@ @@@@@@@@@\r\n" +
"@@@@^^=^@@^ ^' ,ww,w@@@@@ _@@@@@@@@@@\r\n" +
"@@@_xJ~ ~ , @@@@@@@P~_@@@@@@@@@@@@\r\n" +
"@@ @, ,@@@,_____ _,J@@@@@@@@@@@@@\r\n" +
"@@L `' ,@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n" +
"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n" +
"\r\n")
type (
WinSize struct {
Rows uint16
@ -122,9 +95,6 @@ type (
wm hash.Hash
dBuf *bytes.Buffer //decrypt buffer for Read()
}
EscHandler func(io.Writer)
EscSeqs map[byte]EscHandler
)
var (
@ -1114,115 +1084,3 @@ func (hc *Conn) chaffHelper() {
}
}()
}
////////////////////////////////////////////////////
// Copy copies from src to dst until either EOF is reached
// on src or an error occurs. It returns the number of bytes
// copied and the first error encountered while copying, if any.
//
// A successful Copy returns err == nil, not err == EOF.
// Because Copy is defined to read from src until EOF, it does
// not treat an EOF from Read as an error to be reported.
//
// If src implements the WriterTo interface,
// the copy is implemented by calling src.WriteTo(dst).
// Otherwise, if dst implements the ReaderFrom interface,
// the copy is implemented by calling dst.ReadFrom(src).
func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
written, err = copyBuffer(dst, src, nil)
return
}
// copyBuffer is the actual implementation of Copy and CopyBuffer.
// if buf is nil, one is allocated.
func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
// NOTE: using dst.Write() in these esc funcs will cause the output
// to function as a 'macro', outputting as if user typed the sequence.
//
// Using os.Stdout outputs to the client's term w/o it or the server
// 'seeing' the output.
//
// TODO: Devise a way to signal to main client thread that
// a goroutine should be spawned to do long-lived tasks for
// some esc sequences (eg., a time ticker in the corner of terminal,
// or tunnel traffic indicator - note we cannot just spawn a goroutine
// here, as copyBuffer() returns after each burst of data. Scope must
// outlive individual copyBuffer calls).
// (Note that since this custom copyBuffer func is used only by
// the hkexsh client, it should eventually be moved to client.)
escs := EscSeqs{
'i': func(io.Writer) { os.Stdout.Write([]byte("\x1b[s\x1b[2;1H\x1b[1;31m[HKEXSH]\x1b[39;49m\x1b[u")) },
't': func(io.Writer) { os.Stdout.Write([]byte("\x1b[1;32m[HKEXSH]\x1b[39;49m")) },
'B': func(io.Writer) { os.Stdout.Write([]byte("\x1b[1;32m" + Bob + "\x1b[39;49m")) },
}
/*
// If the reader has a WriteTo method, use it to do the copy.
// Avoids an allocation and a copy.
if wt, ok := src.(io.WriterTo); ok {
return wt.WriteTo(dst)
}
// Similarly, if the writer has a ReadFrom method, use it to do the copy.
if rt, ok := dst.(io.ReaderFrom); ok {
return rt.ReadFrom(src)
}
*/
if buf == nil {
size := 32 * 1024
if l, ok := src.(*io.LimitedReader); ok && int64(size) > l.N {
if l.N < 1 {
size = 1
} else {
size = int(l.N)
}
}
buf = make([]byte, size)
}
var seqPos int
for {
nr, er := src.Read(buf)
if nr > 0 {
// Look for sequences to trigger client-side diags
// A repeat of 4 keys (conveniently 'dead' chars for most
// interactive shells; here CTRL-]) shall introduce
// some special responses or actions on the client side.
if seqPos < 4 {
if buf[0] == 0x1d {
seqPos++
}
} else /* seqPos > 0 */ {
if v, ok := escs[buf[0]]; ok {
v(dst)
nr--
buf = buf[1:]
}
seqPos = 0
}
nw, ew := dst.Write(buf[0:nr])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er != nil {
if er != io.EOF {
err = er
}
break
}
}
//_,_ = dst.Write([]byte{0x2f})
return written, err
}
////////////////////////////////////////////////////

145
hkexsh/hkexsh.go
View File

@ -41,6 +41,149 @@ var (
Log *logger.Writer
)
////////////////////////////////////////////////////
const Bob = string("\r\n\r\n" +
"@@@@@@@^^~~~~~~~~~~~~~~~~~~~~^@@@@@@@@@\r\n" +
"@@@@@@^ ~^ @ @@ @ @ @ I ~^@@@@@@\r\n" +
"@@@@@ ~ ~~ ~I @@@@@\r\n" +
"@@@@' ' _,w@< @@@@\r\n" +
"@@@@ @@@@@@@@w___,w@@@@@@@@ @ @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@@@ I @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@*@[ i @@@\r\n" +
"@@@@ @@@@@@@@@@@@@@@@@@@@[][ | ]@@@\r\n" +
"@@@@ ~_,,_ ~@@@@@@@~ ____~ @ @@@\r\n" +
"@@@@ _~ , , `@@@~ _ _`@ ]L J@@@\r\n" +
"@@@@ , @@w@ww+ @@@ww``,,@w@ ][ @@@@\r\n" +
"@@@@, @@@@www@@@ @@@@@@@ww@@@@@[ @@@@\r\n" +
"@@@@@_|| @@@@@@P' @@P@@@@@@@@@@@[|c@@@@\r\n" +
"@@@@@@w| '@@P~ P]@@@-~, ~Y@@^'],@@@@@@\r\n" +
"@@@@@@@[ _ _J@@Tk ]]@@@@@@\r\n" +
"@@@@@@@@,@ @@, c,,,,,,,y ,w@@[ ,@@@@@@@\r\n" +
"@@@@@@@@@ i @w ====--_@@@@@ @@@@@@@@\r\n" +
"@@@@@@@@@@`,P~ _ ~^^^^Y@@@@@ @@@@@@@@@\r\n" +
"@@@@^^=^@@^ ^' ,ww,w@@@@@ _@@@@@@@@@@\r\n" +
"@@@_xJ~ ~ , @@@@@@@P~_@@@@@@@@@@@@\r\n" +
"@@ @, ,@@@,_____ _,J@@@@@@@@@@@@@\r\n" +
"@@L `' ,@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n" +
"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r\n" +
"\r\n")
type (
EscHandler func(io.Writer)
EscSeqs map[byte]EscHandler
)
// Copy copies from src to dst until either EOF is reached
// on src or an error occurs. It returns the number of bytes
// copied and the first error encountered while copying, if any.
//
// A successful Copy returns err == nil, not err == EOF.
// Because Copy is defined to read from src until EOF, it does
// not treat an EOF from Read as an error to be reported.
//
// If src implements the WriterTo interface,
// the copy is implemented by calling src.WriteTo(dst).
// Otherwise, if dst implements the ReaderFrom interface,
// the copy is implemented by calling dst.ReadFrom(src).
func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
written, err = copyBuffer(dst, src, nil)
return
}
// copyBuffer is the actual implementation of Copy and CopyBuffer.
// if buf is nil, one is allocated.
func copyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
// NOTE: using dst.Write() in these esc funcs will cause the output
// to function as a 'macro', outputting as if user typed the sequence.
//
// Using os.Stdout outputs to the client's term w/o it or the server
// 'seeing' the output.
//
// TODO: Devise a way to signal to main client thread that
// a goroutine should be spawned to do long-lived tasks for
// some esc sequences (eg., a time ticker in the corner of terminal,
// or tunnel traffic indicator - note we cannot just spawn a goroutine
// here, as copyBuffer() returns after each burst of data. Scope must
// outlive individual copyBuffer calls).
// (Note that since this custom copyBuffer func is used only by
// the hkexsh client, it should eventually be moved to client.)
escs := EscSeqs{
'i': func(io.Writer) { os.Stdout.Write([]byte("\x1b[s\x1b[2;1H\x1b[1;31m[HKEXSH]\x1b[39;49m\x1b[u")) },
't': func(io.Writer) { os.Stdout.Write([]byte("\x1b[1;32m[HKEXSH]\x1b[39;49m")) },
'B': func(io.Writer) { os.Stdout.Write([]byte("\x1b[1;32m" + Bob + "\x1b[39;49m")) },
}
/*
// If the reader has a WriteTo method, use it to do the copy.
// Avoids an allocation and a copy.
if wt, ok := src.(io.WriterTo); ok {
return wt.WriteTo(dst)
}
// Similarly, if the writer has a ReadFrom method, use it to do the copy.
if rt, ok := dst.(io.ReaderFrom); ok {
return rt.ReadFrom(src)
}
*/
if buf == nil {
size := 32 * 1024
if l, ok := src.(*io.LimitedReader); ok && int64(size) > l.N {
if l.N < 1 {
size = 1
} else {
size = int(l.N)
}
}
buf = make([]byte, size)
}
var seqPos int
for {
nr, er := src.Read(buf)
if nr > 0 {
// Look for sequences to trigger client-side diags
// A repeat of 4 keys (conveniently 'dead' chars for most
// interactive shells; here CTRL-]) shall introduce
// some special responses or actions on the client side.
if seqPos < 4 {
if buf[0] == 0x1d {
seqPos++
}
} else /* seqPos > 0 */ {
if v, ok := escs[buf[0]]; ok {
v(dst)
nr--
buf = buf[1:]
}
seqPos = 0
}
nw, ew := dst.Write(buf[0:nr])
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
if nr != nw {
err = io.ErrShortWrite
break
}
}
if er != nil {
if er != io.EOF {
err = er
}
break
}
}
//_,_ = dst.Write([]byte{0x2f})
return written, err
}
////////////////////////////////////////////////////
// GetSize gets the terminal size using 'stty' command
func GetSize() (cols, rows int, err error) {
cmd := exec.Command("stty", "size") // #nosec
@ -288,7 +431,7 @@ func doShellMode(isInteractive bool, conn *hkexnet.Conn, oldState *hkexsh.State,
_, outerr := func(conn *hkexnet.Conn, r io.Reader) (w int64, e error) {
// Copy() expects EOF so this will
// exit with outerr == nil
w, e = hkexnet.Copy(conn, r)
w, e = Copy(conn, r)
return w, e
}(conn, os.Stdin)