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console.go
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console.go
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package cli
/*
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 (
"context"
"fmt"
"os"
"github.com/gsmith257-cyber/better-sliver-package/client/assets"
"github.com/gsmith257-cyber/better-sliver-package/client/command"
"github.com/gsmith257-cyber/better-sliver-package/client/console"
"github.com/gsmith257-cyber/better-sliver-package/client/transport"
"github.com/gsmith257-cyber/better-sliver-package/protobuf/rpcpb"
"github.com/spf13/cobra"
"google.golang.org/grpc"
"google.golang.org/grpc/connectivity"
)
// consoleCmd generates the console with required pre/post runners.
func consoleCmd(con *console.SliverClient) *cobra.Command {
consoleCmd := &cobra.Command{
Use: "console",
Short: "Start the sliver client console",
}
consoleCmd.RunE, consoleCmd.PersistentPostRunE = consoleRunnerCmd(con, true)
return consoleCmd
}
func consoleRunnerCmd(con *console.SliverClient, run bool) (pre, post func(cmd *cobra.Command, args []string) error) {
var ln *grpc.ClientConn
pre = func(_ *cobra.Command, _ []string) error {
configs := assets.GetConfigs()
if len(configs) == 0 {
fmt.Printf("No config files found at %s (see --help)\n", assets.GetConfigDir())
return nil
}
config := selectConfig()
if config == nil {
return nil
}
// Don't clobber output when simply running an implant command from system shell.
if run {
fmt.Printf("Connecting to %s:%d ...\n", config.LHost, config.LPort)
}
var rpc rpcpb.SliverRPCClient
var err error
rpc, ln, err = transport.MTLSConnect(config)
if err != nil {
fmt.Printf("Connection to server failed %s", err)
return nil
}
// Wait for any connection state changes and exit if the connection is lost.
go handleConnectionLost(ln)
return console.StartClient(con, rpc, command.ServerCommands(con, nil), command.SliverCommands(con), run)
}
// Close the RPC connection once exiting
post = func(_ *cobra.Command, _ []string) error {
if ln != nil {
return ln.Close()
}
return nil
}
return pre, post
}
func handleConnectionLost(ln *grpc.ClientConn) {
currentState := ln.GetState()
// currentState should be "Ready" when the connection is established.
if ln.WaitForStateChange(context.Background(), currentState) {
newState := ln.GetState()
// newState will be "Idle" if the connection is lost.
if newState == connectivity.Idle {
fmt.Println("\nLost connection to server. Exiting now.")
os.Exit(1)
}
}
}