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Used fixed goutmp pty logging

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Signed-off-by: Russ Magee <rmagee@gmail.com>
This commit is contained in:
Russ Magee 2019-07-04 20:27:49 -07:00
parent 9e885d5bd7
commit 1aa8a1549b
2 changed files with 36 additions and 12 deletions
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11
hkexnet/consts.go
View file

@ -37,11 +37,12 @@ type KEXAlg uint8
// Extended exit status codes - indicate comm/pty issues
// rather than remote end normal UNIX exit codes
const (
CSENone = 1024 + iota
CSETruncCSO // No CSOExitStatus in payload
CSEStillOpen // Channel closed unexpectedly
CSEExecFail // cmd.Start() (exec) failed
CSEPtyExecFail // pty.Start() (exec w/pty) failed
CSENone = 1024 + iota
CSETruncCSO // No CSOExitStatus in payload
CSEStillOpen // Channel closed unexpectedly
CSEExecFail // cmd.Start() (exec) failed
CSEPtyExecFail // pty.Start() (exec w/pty) failed
CSEPtyGetNameFail // failed to obtain pty name
)
// Extended (>255 UNIX exit status) codes

37
hkexshd/hkexshd.go
View file

@ -25,6 +25,7 @@ import (
"path"
"sync"
"syscall"
"unsafe"
"blitter.com/go/goutmp"
hkexsh "blitter.com/go/hkexsh"
@ -38,6 +39,22 @@ var (
Log *logger.Writer
)
func ioctl(fd, request, argp uintptr) error {
if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, fd, request, argp, 0, 0, 0); e != 0 {
return e
}
return nil
}
func ptsName(fd uintptr) (string, error) {
var n uintptr
err := ioctl(fd, syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n)))
if err != nil {
return "", err
}
return fmt.Sprintf("/dev/pts/%d", n), nil
}
/* -------------------------------------------------------------- */
// Perform a client->server copy
func runClientToServerCopyAs(who, ttype string, conn *hkexnet.Conn, fpath string, chaffing bool) (exitStatus uint32, err error) {
@ -230,7 +247,7 @@ func runServerToClientCopyAs(who, ttype string, conn *hkexnet.Conn, srcPath stri
//
// Uses ptys to support commands which expect a terminal.
// nolint: gocyclo
func runShellAs(who, ttype string, cmd string, interactive bool, conn *hkexnet.Conn, chaffing bool) (exitStatus uint32, err error) {
func runShellAs(who, hname, ttype, cmd string, interactive bool, conn *hkexnet.Conn, chaffing bool) (exitStatus uint32, err error) {
var wg sync.WaitGroup
u, err := user.Lookup(who)
if err != nil {
@ -279,6 +296,15 @@ func runShellAs(who, ttype string, cmd string, interactive bool, conn *hkexnet.C
// #gv:s/label=\"runShellAs\$1\"/label=\"deferPtmxClose\"/
defer func() { _ = ptmx.Close() }() // nolint: gosec
// get pty info for system accounting (who, lastlog)
pts, pe := ptsName(ptmx.Fd())
if pe != nil {
return hkexnet.CSEPtyGetNameFail, err
}
utmpx := goutmp.Put_utmp(who, pts, hname)
defer func() { goutmp.Unput_utmp(utmpx) }()
goutmp.Put_lastlog_entry("hkexsh", who, pts, hname)
log.Printf("[%s]\n", cmd)
if err != nil {
log.Printf("Command finished with error: %v", err)
@ -571,7 +597,7 @@ func main() {
logger.LogNotice(fmt.Sprintf("[Generating autologin token for [%s@%s]]\n", rec.Who(), hname)) // nolint: gosec,errcheck
token := GenAuthToken(string(rec.Who()), string(rec.ConnHost()))
tokenCmd := fmt.Sprintf("echo \"%s\" | tee -a ~/.hkexsh_id", token)
cmdStatus, runErr := runShellAs(string(rec.Who()), string(rec.TermType()), tokenCmd, false, hc, chaffEnabled)
cmdStatus, runErr := runShellAs(string(rec.Who()), hname, string(rec.TermType()), tokenCmd, false, hc, chaffEnabled)
// Returned hopefully via an EOF or exit/logout;
// Clear current op so user can enter next, or EOF
rec.SetOp([]byte{0})
@ -586,7 +612,7 @@ func main() {
addr := hc.RemoteAddr()
hname := goutmp.GetHost(addr.String())
logger.LogNotice(fmt.Sprintf("[Running command for [%s@%s]]\n", rec.Who(), hname)) // nolint: gosec,errcheck
cmdStatus, runErr := runShellAs(string(rec.Who()), string(rec.TermType()), string(rec.Cmd()), false, hc, chaffEnabled)
cmdStatus, runErr := runShellAs(string(rec.Who()), hname, string(rec.TermType()), string(rec.Cmd()), false, hc, chaffEnabled)
// Returned hopefully via an EOF or exit/logout;
// Clear current op so user can enter next, or EOF
rec.SetOp([]byte{0})
@ -602,10 +628,7 @@ func main() {
hname := goutmp.GetHost(addr.String())
logger.LogNotice(fmt.Sprintf("[Running shell for [%s@%s]]\n", rec.Who(), hname)) // nolint: gosec,errcheck
utmpx := goutmp.Put_utmp(string(rec.Who()), hname)
defer func() { goutmp.Unput_utmp(utmpx) }()
goutmp.Put_lastlog_entry("hkexsh", string(rec.Who()), hname)
cmdStatus, runErr := runShellAs(string(rec.Who()), string(rec.TermType()), string(rec.Cmd()), true, hc, chaffEnabled)
cmdStatus, runErr := runShellAs(string(rec.Who()), hname, string(rec.TermType()), string(rec.Cmd()), true, hc, chaffEnabled)
// Returned hopefully via an EOF or exit/logout;
// Clear current op so user can enter next, or EOF
rec.SetOp([]byte{0})