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Alexandre Beaulieu 2019-04-15 13:04:21 -04:00
commit 030ac2527c
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1 changed files with 36 additions and 47 deletions
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83
modules/rdp_proxy/rdp_proxy_linux_amd64.go
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@ -1,11 +1,10 @@
package packet_proxy package rdp_proxy
import ( import (
"fmt" "fmt"
"net"
"io/ioutil" "io/ioutil"
golog "log" golog "log"
"plugin"
"strings"
"syscall" "syscall"
"github.com/bettercap/bettercap/core" "github.com/bettercap/bettercap/core"
@ -15,8 +14,8 @@ import (
"github.com/google/gopacket" "github.com/google/gopacket"
"github.com/google/gopacket/layers" "github.com/google/gopacket/layers"
"github.com/evilsocket/islazy/fs" // "github.com/evilsocket/islazy/fs"
"github.com/evilsocket/islazy/tui" // "github.com/evilsocket/islazy/tui"
) )
type RdpProxy struct { type RdpProxy struct {
@ -25,7 +24,7 @@ type RdpProxy struct {
queue *nfqueue.Queue queue *nfqueue.Queue
queueNum int queueNum int
port int port int
start_port int startPort int
cmd string cmd string
targets string // TODO targets string // TODO
} }
@ -40,8 +39,8 @@ func NewRdpProxy(s *session.Session) *RdpProxy {
queueNum: 0, queueNum: 0,
port: 0, port: 0,
startPort: 40000, startPort: 40000,
cmd: nil, cmd: "pyrdp-mitm",
targets: nil, targets: "<All Subnet>",
} }
mod.AddHandler(session.NewModuleHandler("rdp.proxy on", "", "Start the RDP proxy.", mod.AddHandler(session.NewModuleHandler("rdp.proxy on", "", "Start the RDP proxy.",
@ -57,8 +56,8 @@ func NewRdpProxy(s *session.Session) *RdpProxy {
mod.AddParam(session.NewIntParameter("rdp.proxy.queue.num", "0", "NFQUEUE number to bind to.")) mod.AddParam(session.NewIntParameter("rdp.proxy.queue.num", "0", "NFQUEUE number to bind to."))
mod.AddParam(session.NewIntParameter("rdp.proxy.port", "3389", "RDP port to intercept.")) mod.AddParam(session.NewIntParameter("rdp.proxy.port", "3389", "RDP port to intercept."))
mod.AddParam(session.NewIntParameter("rdp.proxy.start", "40000", "Starting port for pyrdp sessionss")) mod.AddParam(session.NewIntParameter("rdp.proxy.start", "40000", "Starting port for pyrdp sessionss"))
mod.AddParam(session.NewStringParameter("rdp.proxy.command", "pyrdp-mitm", "The PyRDP base command to launch the man-in-the-middle.")) mod.AddParam(session.NewStringParameter("rdp.proxy.command", "pyrdp-mitm", "", "The PyRDP base command to launch the man-in-the-middle."))
mod.AddParam(session.NewStringParameter("rdp.proxy.targets", "<All Subnets>", "A comma delimited list of destination IPs or CIDRs to target.")) mod.AddParam(session.NewStringParameter("rdp.proxy.targets", "<All Subnets>", "", "A comma delimited list of destination IPs or CIDRs to target."))
/* NOTES /* NOTES
* - The RDP port * - The RDP port
@ -106,44 +105,38 @@ func (mod *RdpProxy) destroyQueue() {
mod.queue = nil mod.queue = nil
} }
// Setup the proxy chain // "iptables -I 1 -p tcp -m tcp --dport 3389 -d 10.0.0.0/24 -j NFQUEUE --queue-num 0 --queue-bypass"
"iptables -t nat -N BCAPRDP" // Create RDP chain
"iptables -t nat -X BCAPRDP" // Delete RDP chain
"iptables -t nat -I 1 PREROUTING -j BCAPRDP" // Go to BCAPRDP immediately before anything else
// Intercept SYNS (TODO: -m conntrack --cstate=new) ?
"iptables -I 1 -p tcp -m tcp --dport 3389 -d 10.0.0.0/24 -j NFQUEUE --queue-num 0 --queue-bypass"
// Starts or stops a particular proxy instances. // Starts or stops a particular proxy instances.
func (mod *RdpProxy) doProxy(target net.IPv4, enable bool) (err error) { func (mod *RdpProxy) proxy(target net.Addr) (err error) {
// Configure the firewall.
action := "-A"
if !enable {
action = "-D"
}
args := []string{ args := []string{
action, mod.chainName,
}
if mod.rule != "" {
rule := strings.Split(mod.rule, " ")
args = append(args, rule...)
}
args = append(args, []string{
"-j", "NFQUEUE", "-j", "NFQUEUE",
"--queue-num", fmt.Sprintf("%d", mod.queueNum), "--queue-num", fmt.Sprintf("%d", mod.queueNum),
"--queue-bypass", "--queue-bypass",
}...) }
mod.Debug("iptables %s", args) mod.Debug("iptables %s", args)
_, err = core.Exec("iptables", args) // _, err = core.Exec("iptables", args)
return return
} }
func (mod *RdpProxy) configureFirewall(enable bool) (err error) {
chain := []string { "-t", "nat", "-N", "BCAPRDP" }
nat := []string { "-t", "nat", "-I", "1", "PREROUTING", "-j", "BCAPRDP" }
if !enable {
chain = []string { "-t", "nat", "-X", "BCAPRDP" }
nat = []string { "-t", "nat", "-D", "PREROUTING", "-j", "BCAPRDP" }
}
_, err = core.Exec("iptables", chain)
_, err = core.Exec("iptables", nat)
return
}
func (mod *RdpProxy) Configure() (err error) { func (mod *RdpProxy) Configure() (err error) {
// //
// The gist of what this function does is: // The gist of what this function does is:
@ -157,16 +150,11 @@ func (mod *RdpProxy) Configure() (err error) {
if err, mod.queueNum = mod.IntParam("packet.proxy.queue.num"); err != nil { if err, mod.queueNum = mod.IntParam("packet.proxy.queue.num"); err != nil {
return return
} else if err, mod.chainName = mod.StringParam("packet.proxy.chain"); err != nil { // } else if err, mod.pluginPath = mod.StringParam("packet.proxy.plugin"); err != nil {
return // return
} else if err, mod.rule = mod.StringParam("packet.proxy.rule"); err != nil {
return
} else if err, mod.pluginPath = mod.StringParam("packet.proxy.plugin"); err != nil {
return
} }
mod.Info("Starting NFQUEUE handler...") mod.Info("Starting NFQUEUE handler...")
var ok bool
// Create the NFQUEUE handler. // Create the NFQUEUE handler.
mod.queue = new(nfqueue.Queue) mod.queue = new(nfqueue.Queue)
@ -182,7 +170,7 @@ func (mod *RdpProxy) Configure() (err error) {
return return
} else if err = mod.queue.SetMode(nfqueue.NFQNL_COPY_PACKET); err != nil { } else if err = mod.queue.SetMode(nfqueue.NFQNL_COPY_PACKET); err != nil {
return return
} else if err = mod.runRule(true); err != nil { } else if err = mod.configureFirewall(true); err != nil {
return return
} }
@ -192,9 +180,9 @@ func (mod *RdpProxy) Configure() (err error) {
func (mod *RdpProxy) handleRdpConnection(payload *nfqueue.Payload) int { func (mod *RdpProxy) handleRdpConnection(payload *nfqueue.Payload) int {
// 1. Determine source and target addresses. // 1. Determine source and target addresses.
p := gopacket.NewPacket(payload, layers.LayerTypeEthernet, gopacket.NoCopy) p := gopacket.NewPacket(payload.Data, layers.LayerTypeEthernet, gopacket.NoCopy)
log.Info("New Connection: %v", payload) mod.Info("New Connection: %v", p)
// 2. Check if the destination IP already has a PYRDP session active, if so, do nothing. // 2. Check if the destination IP already has a PYRDP session active, if so, do nothing.
// 3. Otherwise: // 3. Otherwise:
// 3.1. Spawn a PYRDP instance on a fresh port // 3.1. Spawn a PYRDP instance on a fresh port
@ -202,11 +190,12 @@ func (mod *RdpProxy) handleRdpConnection(payload *nfqueue.Payload) int {
// Force a retransmit to trigger the new firewall rules. // Force a retransmit to trigger the new firewall rules.
// TODO: Find a more efficient way to do this. // TODO: Find a more efficient way to do this.
payload.SetVerdict(nfqueue.NF_DROP) payload.SetVerdict(nfqueue.NF_DROP)
return 0
} }
// NFQUEUE needs a raw function. // NFQUEUE needs a raw function.
func OnRDPConnection(payload *nfqueue.Payload) int { func OnRDPConnection(payload *nfqueue.Payload) int {
return mod.handleRdpConnection() return mod.handleRdpConnection(payload)
} }
func (mod *RdpProxy) Start() error { func (mod *RdpProxy) Start() error {
@ -230,7 +219,7 @@ func (mod *RdpProxy) Start() error {
func (mod *RdpProxy) Stop() error { func (mod *RdpProxy) Stop() error {
return mod.SetRunning(false, func() { return mod.SetRunning(false, func() {
mod.queue.StopLoop() mod.queue.StopLoop()
mod.runRule(false) mod.configureFirewall(false)
<-mod.done <-mod.done
}) })
} }