mirror of https://gogs.blitter.com/RLabs/xs
Added hkexpasswd util; moved minimal term stuff into hkexauth.go
This commit is contained in:
Russ Magee
parent
3ca98d364c
commit
d484ec7fd1
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@ -18,10 +18,10 @@
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--
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This is a drop-in replacement for the golang/pkg/net facilities
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(net.Dial(), net.Listen(), net.Accept() and net.Conn type) using the
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Package herradurakex is a drop-in replacement for golang/pkg/net facilities
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(net.Dial(), net.Listen(), net.Accept() and the net.Conn type) using the
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experimental HerraduraKEx 'secure' key exchange algorithm, first released at
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github.com/Caume/HerraduraKEx
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(Omar Elejandro Herrera Reyna's github page)[github.com/Caume/HerraduraKEx].
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One can simply replace calls to net.Dial() with hkex.Dial(), and likewise
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net.Listen() with hkex.Listen(), to obtain connections (hkex.Conn) conforming
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@ -13,7 +13,6 @@ import (
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hkex "blitter.com/herradurakex"
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isatty "github.com/mattn/go-isatty"
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"golang.org/x/sys/unix"
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)
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type cmdSpec struct {
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@ -69,16 +68,17 @@ func main() {
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panic(err)
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}
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defer conn.Close()
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// From this point on, conn is a secure encrypted channel
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// Set stdin in raw mode if it's an interactive session
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// TODO: send flag to server side indicating this
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// affects shell command used
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if isatty.IsTerminal(os.Stdin.Fd()) {
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oldState, err := MakeRaw(int(os.Stdin.Fd()))
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oldState, err := hkex.MakeRaw(int(os.Stdin.Fd()))
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if err != nil {
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panic(err)
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}
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defer func() { _ = Restore(int(os.Stdin.Fd()), oldState) }() // Best effort.
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defer func() { _ = hkex.Restore(int(os.Stdin.Fd()), oldState) }() // Best effort.
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} else {
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log.Println("NOT A TTY")
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}
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@ -108,7 +108,8 @@ func main() {
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if len(authCookie) == 0 {
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fmt.Printf("Gimme cookie:")
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ab, err := ReadPassword(int(os.Stdin.Fd()))
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ab, err := hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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panic(err)
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}
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@ -179,124 +180,3 @@ func main() {
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// Wait until both stdin and stdout goroutines finish
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wg.Wait()
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}
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/* ------------- minimal terminal APIs brought in from ssh/terminal
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* (they have no real business being there as they aren't specific to
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* ssh, but as of v1.10, early 2018, core go stdlib hasn't yet done
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* the planned terminal lib reorgs.)
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* -------------
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*/
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// From github.com/golang/crypto/blob/master/ssh/terminal/util_linux.go
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const ioctlReadTermios = unix.TCGETS
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const ioctlWriteTermios = unix.TCSETS
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// From github.com/golang/crypto/blob/master/ssh/terminal/util.go
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// State contains the state of a terminal.
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type State struct {
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termios unix.Termios
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}
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// MakeRaw put the terminal connected to the given file descriptor into raw
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// mode and returns the previous state of the terminal so that it can be
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// restored.
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func MakeRaw(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, err
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}
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oldState := State{termios: *termios}
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// This attempts to replicate the behaviour documented for cfmakeraw in
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// the termios(3) manpage.
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termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON
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termios.Oflag &^= unix.OPOST
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termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
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termios.Cflag &^= unix.CSIZE | unix.PARENB
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termios.Cflag |= unix.CS8
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termios.Cc[unix.VMIN] = 1
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termios.Cc[unix.VTIME] = 0
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, termios); err != nil {
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return nil, err
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}
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return &oldState, nil
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}
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// GetState returns the current state of a terminal which may be useful to
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// restore the terminal after a signal.
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func GetState(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, err
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}
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return &State{termios: *termios}, nil
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}
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// Restore restores the terminal connected to the given file descriptor to a
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// previous state.
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func Restore(fd int, state *State) error {
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return unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.termios)
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}
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// ReadPassword reads a line of input from a terminal without local echo. This
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// is commonly used for inputting passwords and other sensitive data. The slice
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// returned does not include the \n.
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func ReadPassword(fd int) ([]byte, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, err
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}
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newState := *termios
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newState.Lflag &^= unix.ECHO
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newState.Lflag |= unix.ICANON | unix.ISIG
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newState.Iflag |= unix.ICRNL
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newState); err != nil {
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return nil, err
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}
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defer func() {
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unix.IoctlSetTermios(fd, ioctlWriteTermios, termios)
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}()
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return readPasswordLine(passwordReader(fd))
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}
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// passwordReader is an io.Reader that reads from a specific file descriptor.
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type passwordReader int
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func (r passwordReader) Read(buf []byte) (int, error) {
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return unix.Read(int(r), buf)
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}
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// readPasswordLine reads from reader until it finds \n or io.EOF.
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// The slice returned does not include the \n.
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// readPasswordLine also ignores any \r it finds.
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func readPasswordLine(reader io.Reader) ([]byte, error) {
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var buf [1]byte
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var ret []byte
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for {
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n, err := reader.Read(buf[:])
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if n > 0 {
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switch buf[0] {
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case '\n':
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return ret, nil
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case '\r':
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// remove \r from passwords on Windows
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default:
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ret = append(ret, buf[0])
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}
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continue
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}
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if err != nil {
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if err == io.EOF && len(ret) > 0 {
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return ret, nil
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}
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return ret, err
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}
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}
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}
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@ -0,0 +1,128 @@
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// Util to generate/store passwords for users in a file akin to /etc/passwd
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// suitable for the demo hkexsh server, using bcrypt.
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package main
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import (
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"bytes"
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"encoding/csv"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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hkex "blitter.com/herradurakex"
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"github.com/jameskeane/bcrypt"
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)
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func main() {
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var pfName string
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var newpw string
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var confirmpw string
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var userName string
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flag.StringVar(&userName, "u", "", "username")
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flag.StringVar(&pfName, "f", "/etc/hkexsh.passwd", "passwd file")
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flag.Parse()
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var uname string
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if len(userName) == 0 {
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log.Println("specify username with -u")
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os.Exit(1)
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}
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u, err := user.Lookup(userName)
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if err != nil {
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log.Printf("Invalid user %s\n", userName)
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log.Fatal(err)
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}
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uname = u.Username
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fmt.Printf("New Password:")
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ab, err := hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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newpw = string(ab)
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fmt.Printf("Confirm:")
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ab, err = hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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confirmpw = string(ab)
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if confirmpw != newpw {
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log.Println("New passwords do not match.")
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os.Exit(1)
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}
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// generate a random salt with specific rounds of complexity
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// (default in jameskeane/bcrypt is 12 but we'll be explicit here)
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salt, err := bcrypt.Salt(12)
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if err != nil {
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fmt.Println("ERROR: bcrypt.Salt() failed.")
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os.Exit(2)
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}
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// hash and verify a password with explicit (random) salt
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hash, err := bcrypt.Hash(newpw, salt)
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if err != nil || !bcrypt.Match(newpw, hash) {
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fmt.Println("ERROR: bcrypt.Match() failed.")
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log.Fatal(err)
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}
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//fmt.Println("Salt:", salt, "Hash:", hash)
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b, err := ioutil.ReadFile(pfName)
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if err != nil {
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log.Fatal(err)
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}
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r := csv.NewReader(bytes.NewReader(b))
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r.Comma = ':'
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r.Comment = '#'
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r.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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records, err := r.ReadAll()
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if err != nil {
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log.Fatal(err)
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}
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for i, _ := range records {
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//fmt.Println(records[i])
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if records[i][0] == uname {
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records[i][1] = salt
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records[i][2] = hash
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}
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//// csv lib doesn't preserve comment in record, so put it back
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//if records[i][0][0] == '!' {
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// records[i][0] = "#" + records[i][0]
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//}
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}
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outFile, err := ioutil.TempFile("", "hkexsh-passwd")
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if err != nil {
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log.Fatal(err)
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}
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w := csv.NewWriter(outFile)
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w.Comma = ':'
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//w.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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w.Write([]string{"#username", "salt", "authCookie", "disallowedCmdList"})
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w.WriteAll(records)
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if err = w.Error(); err != nil {
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log.Fatal(err)
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}
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err = os.Remove(pfName)
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if err != nil {
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log.Fatal(err)
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}
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err = os.Rename(outFile.Name(), pfName)
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if err != nil {
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log.Fatal(err)
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}
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}
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@ -0,0 +1,128 @@
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// Util to generate/store passwords for users in a file akin to /etc/passwd
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// suitable for the demo hkexsh server, using bcrypt.
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package main
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import (
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"bytes"
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"encoding/csv"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/user"
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hkex "blitter.com/herradurakex"
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"github.com/jameskeane/bcrypt"
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)
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func main() {
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var pfName string
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var newpw string
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var confirmpw string
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var userName string
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flag.StringVar(&userName, "u", "", "username")
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flag.StringVar(&pfName, "f", "/etc/hkexsh.passwd", "passwd file")
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flag.Parse()
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var uname string
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if len(userName) == 0 {
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log.Println("specify username with -u")
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os.Exit(1)
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}
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u, err := user.Lookup(userName)
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if err != nil {
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log.Printf("Invalid user %s\n", userName)
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log.Fatal(err)
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}
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uname = u.Username
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fmt.Printf("New Password:")
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ab, err := hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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newpw = string(ab)
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fmt.Printf("Confirm:")
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ab, err = hkex.ReadPassword(int(os.Stdin.Fd()))
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fmt.Printf("\r\n")
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if err != nil {
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log.Fatal(err)
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os.Exit(1)
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}
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confirmpw = string(ab)
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if confirmpw != newpw {
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log.Println("New passwords do not match.")
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os.Exit(1)
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}
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// generate a random salt with specific rounds of complexity
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// (default in jameskeane/bcrypt is 12 but we'll be explicit here)
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salt, err := bcrypt.Salt(12)
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if err != nil {
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fmt.Println("ERROR: bcrypt.Salt() failed.")
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os.Exit(2)
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}
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// hash and verify a password with explicit (random) salt
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hash, err := bcrypt.Hash(newpw, salt)
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if err != nil || !bcrypt.Match(newpw, hash) {
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fmt.Println("ERROR: bcrypt.Match() failed.")
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log.Fatal(err)
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}
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//fmt.Println("Salt:", salt, "Hash:", hash)
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b, err := ioutil.ReadFile(pfName)
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if err != nil {
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log.Fatal(err)
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}
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r := csv.NewReader(bytes.NewReader(b))
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r.Comma = ':'
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r.Comment = '#'
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r.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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records, err := r.ReadAll()
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if err != nil {
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log.Fatal(err)
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}
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for i, _ := range records {
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fmt.Println(records[i])
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if records[i][0] == uname {
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records[i][1] = salt
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records[i][2] = hash
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}
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//// csv lib doesn't preserve comment in record, so put it back
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//if records[i][0][0] == '!' {
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// records[i][0] = "#" + records[i][0]
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//}
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}
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outFile, err := ioutil.TempFile("", "hkexsh-passwd")
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if err != nil {
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log.Fatal(err)
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}
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w := csv.NewWriter(outFile)
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w.Comma = ':'
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//w.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
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w.Write([]string{"#username", "salt", "authCookie", "disallowedCmdList"})
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w.WriteAll(records)
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if err = w.Error(); err != nil {
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log.Fatal(err)
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}
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err = os.Remove(pfName)
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if err != nil {
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log.Fatal(err)
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}
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err = os.Rename(outFile.Name(), pfName)
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if err != nil {
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log.Fatal(err)
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}
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}
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@ -13,6 +13,7 @@ import (
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"syscall"
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hkex "blitter.com/herradurakex"
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"blitter.com/spinsult"
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"github.com/kr/pty"
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)
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@ -109,8 +110,7 @@ func runShellAs(who string, cmd string, interactive bool, conn hkex.Conn) (err e
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}
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func rejectUserMsg() string {
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// TODO: Use Shakespeare insult generator. :p
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return "Invalid user\r\n"
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return "Begone, " + spinsult.GetSentence() + "\r\n"
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}
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// Demo of a simple server that listens and spawns goroutines for each
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@ -201,9 +201,9 @@ func main() {
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valid, allowedCmds := hkex.AuthUser(string(rec.who), string(rec.authCookie), "/etc/hkexsh.passwd")
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if !valid {
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log.Println("Invalid user", string(rec.who))
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c.Write([]byte(rejectUserMsg()))
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return
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log.Println("Invalid user", string(rec.who))
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c.Write([]byte(rejectUserMsg()))
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return
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}
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log.Printf("[allowedCmds:%s]\n", allowedCmds)
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|
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136
hkexauth.go
136
hkexauth.go
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@ -10,9 +10,12 @@ import (
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"io/ioutil"
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"log"
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"runtime"
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|
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"github.com/jameskeane/bcrypt"
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"golang.org/x/sys/unix"
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)
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func AuthUser(username string, authcookie string, fname string) (valid bool, allowedCmds string) {
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||||
func AuthUser(username string, auth string, fname string) (valid bool, allowedCmds string) {
|
||||
b, _ := ioutil.ReadFile(fname)
|
||||
r := csv.NewReader(bytes.NewReader(b))
|
||||
|
||||
|
|
@ -21,7 +24,7 @@ func AuthUser(username string, authcookie string, fname string) (valid bool, all
|
|||
|
||||
r.Comma = ':'
|
||||
r.Comment = '#'
|
||||
r.FieldsPerRecord = 3 // username:authCookie:disallowedCmdList (a,b,...)
|
||||
r.FieldsPerRecord = 4 // username:salt:authCookie:disallowedCmdList (a,b,...)
|
||||
for {
|
||||
record, err := r.Read()
|
||||
if err == io.EOF {
|
||||
|
|
@ -31,9 +34,11 @@ func AuthUser(username string, authcookie string, fname string) (valid bool, all
|
|||
log.Fatal(err)
|
||||
}
|
||||
|
||||
if username == record[0] &&
|
||||
authcookie == record[1] {
|
||||
valid = true
|
||||
if username == record[0] {
|
||||
tmp, _ := bcrypt.Hash(auth, record[1])
|
||||
if tmp == record[2] {
|
||||
valid = true
|
||||
}
|
||||
break
|
||||
}
|
||||
|
||||
|
|
@ -41,3 +46,124 @@ func AuthUser(username string, authcookie string, fname string) (valid bool, all
|
|||
}
|
||||
return
|
||||
}
|
||||
|
||||
/* ------------- minimal terminal APIs brought in from ssh/terminal
|
||||
* (they have no real business being there as they aren't specific to
|
||||
* ssh, but as of v1.10, early 2018, core go stdlib hasn't yet done
|
||||
* the planned terminal lib reorgs.)
|
||||
* -------------
|
||||
*/
|
||||
|
||||
// From github.com/golang/crypto/blob/master/ssh/terminal/util_linux.go
|
||||
const ioctlReadTermios = unix.TCGETS
|
||||
const ioctlWriteTermios = unix.TCSETS
|
||||
|
||||
// From github.com/golang/crypto/blob/master/ssh/terminal/util.go
|
||||
// State contains the state of a terminal.
|
||||
type State struct {
|
||||
termios unix.Termios
|
||||
}
|
||||
|
||||
// MakeRaw put the terminal connected to the given file descriptor into raw
|
||||
// mode and returns the previous state of the terminal so that it can be
|
||||
// restored.
|
||||
func MakeRaw(fd int) (*State, error) {
|
||||
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
oldState := State{termios: *termios}
|
||||
|
||||
// This attempts to replicate the behaviour documented for cfmakeraw in
|
||||
// the termios(3) manpage.
|
||||
termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON
|
||||
termios.Oflag &^= unix.OPOST
|
||||
termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
|
||||
termios.Cflag &^= unix.CSIZE | unix.PARENB
|
||||
termios.Cflag |= unix.CS8
|
||||
termios.Cc[unix.VMIN] = 1
|
||||
termios.Cc[unix.VTIME] = 0
|
||||
if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, termios); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &oldState, nil
|
||||
}
|
||||
|
||||
// GetState returns the current state of a terminal which may be useful to
|
||||
// restore the terminal after a signal.
|
||||
func GetState(fd int) (*State, error) {
|
||||
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return &State{termios: *termios}, nil
|
||||
}
|
||||
|
||||
// Restore restores the terminal connected to the given file descriptor to a
|
||||
// previous state.
|
||||
func Restore(fd int, state *State) error {
|
||||
return unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.termios)
|
||||
}
|
||||
|
||||
// ReadPassword reads a line of input from a terminal without local echo. This
|
||||
// is commonly used for inputting passwords and other sensitive data. The slice
|
||||
// returned does not include the \n.
|
||||
func ReadPassword(fd int) ([]byte, error) {
|
||||
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
newState := *termios
|
||||
newState.Lflag &^= unix.ECHO
|
||||
newState.Lflag |= unix.ICANON | unix.ISIG
|
||||
newState.Iflag |= unix.ICRNL
|
||||
if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newState); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
defer func() {
|
||||
unix.IoctlSetTermios(fd, ioctlWriteTermios, termios)
|
||||
}()
|
||||
|
||||
return readPasswordLine(passwordReader(fd))
|
||||
}
|
||||
|
||||
// passwordReader is an io.Reader that reads from a specific file descriptor.
|
||||
type passwordReader int
|
||||
|
||||
func (r passwordReader) Read(buf []byte) (int, error) {
|
||||
return unix.Read(int(r), buf)
|
||||
}
|
||||
|
||||
// readPasswordLine reads from reader until it finds \n or io.EOF.
|
||||
// The slice returned does not include the \n.
|
||||
// readPasswordLine also ignores any \r it finds.
|
||||
func readPasswordLine(reader io.Reader) ([]byte, error) {
|
||||
var buf [1]byte
|
||||
var ret []byte
|
||||
|
||||
for {
|
||||
n, err := reader.Read(buf[:])
|
||||
if n > 0 {
|
||||
switch buf[0] {
|
||||
case '\n':
|
||||
return ret, nil
|
||||
case '\r':
|
||||
// remove \r from passwords on Windows
|
||||
default:
|
||||
ret = append(ret, buf[0])
|
||||
}
|
||||
continue
|
||||
}
|
||||
if err != nil {
|
||||
if err == io.EOF && len(ret) > 0 {
|
||||
return ret, nil
|
||||
}
|
||||
return ret, err
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue