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xs
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Made padding size random (max/2, max]; use of improved goutmp host lookup

This commit is contained in:
Russ Magee 2018-10-02 11:03:10 -07:00
parent 1485e8392e
commit 6788fd1adf
2 changed files with 9 additions and 12 deletions
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5
hkexnet/hkexnet.go
View File

@ -590,8 +590,9 @@ func (hc *Conn) WritePacket(b []byte, op byte) (n int, err error) {
}
//Padding
padLen := PAD_SZ - ((uint32(len(b)) + PAD_SZ) % PAD_SZ)
if padLen == PAD_SZ {
padSz := (rand.Intn(PAD_SZ) / 2) + (PAD_SZ / 2)
padLen := padSz - ((len(b) + padSz) % padSz)
if padLen == padSz {
// No padding required
padLen = 0
}

16
hkexshd/hkexshd.go
View File

@ -22,7 +22,6 @@ import (
"os/exec"
"os/user"
"path"
"strings"
"sync"
"syscall"
@ -353,7 +352,7 @@ func GenAuthToken(who string, connhost string) string {
// Compare to 'serverp.go' in this directory to see the equivalence.
func main() {
version := hkexsh.Version
var vopt bool
var chaffEnabled bool
var chaffFreqMin uint
@ -510,7 +509,7 @@ func main() {
if rec.Op()[0] == 'A' {
// Generate automated login token
addr := hc.RemoteAddr()
hname := strings.Split(addr.String(), ":")[0]
hname := goutmp.GetHost(addr.String())
log.Printf("[Generating autologin token for [%s@%s]]\n", rec.Who(), hname)
token := GenAuthToken(string(rec.Who()), string(rec.ConnHost()))
tokenCmd := fmt.Sprintf("echo \"%s\" | tee -a ~/.hkexsh_id", token)
@ -527,9 +526,7 @@ func main() {
} else if rec.Op()[0] == 'c' {
// Non-interactive command
addr := hc.RemoteAddr()
//hname := goutmp.GetHost(addr.String())
hname := strings.Split(addr.String(), ":")[0]
hname := goutmp.GetHost(addr.String())
log.Printf("[Running command for [%s@%s]]\n", rec.Who(), hname)
runErr, cmdStatus := runShellAs(string(rec.Who()), string(rec.TermType()), string(rec.Cmd()), false, hc, chaffEnabled)
// Returned hopefully via an EOF or exit/logout;
@ -544,8 +541,7 @@ func main() {
} else if rec.Op()[0] == 's' {
// Interactive session
addr := hc.RemoteAddr()
//hname := goutmp.GetHost(addr.String())
hname := strings.Split(addr.String(), ":")[0]
hname := goutmp.GetHost(addr.String())
log.Printf("[Running shell for [%s@%s]]\n", rec.Who(), hname)
utmpx := goutmp.Put_utmp(string(rec.Who()), hname)
@ -565,7 +561,7 @@ func main() {
// File copy (destination) operation - client copy to server
log.Printf("[Client->Server copy]\n")
addr := hc.RemoteAddr()
hname := strings.Split(addr.String(), ":")[0]
hname := goutmp.GetHost(addr.String())
log.Printf("[Running copy for [%s@%s]]\n", rec.Who(), hname)
runErr, cmdStatus := runClientToServerCopyAs(string(rec.Who()), string(rec.TermType()), hc, string(rec.Cmd()), chaffEnabled)
// Returned hopefully via an EOF or exit/logout;
@ -587,7 +583,7 @@ func main() {
// File copy (src) operation - server copy to client
log.Printf("[Server->Client copy]\n")
addr := hc.RemoteAddr()
hname := strings.Split(addr.String(), ":")[0]
hname := goutmp.GetHost(addr.String())
log.Printf("[Running copy for [%s@%s]]\n", rec.Who(), hname)
runErr, cmdStatus := runServerToClientCopyAs(string(rec.Who()), string(rec.TermType()), hc, string(rec.Cmd()), chaffEnabled)
// Returned hopefully via an EOF or exit/logout;