Repository: praetorian-inc/trudy
Branch: master
Commit: 619d25bba282
Files: 13
Total size: 55.8 KB
Directory structure:
gitextract_pxbzavi7/
├── .gitignore
├── LICENSE
├── README.md
├── certificate/
│ ├── the-password-is-password
│ ├── trudy.cer
│ ├── trudy.key
│ ├── trudy.pem
│ └── trudy.pfx
├── listener/
│ └── listener.go
├── main.go
├── module/
│ ├── module.go
│ └── xmpp.go.trudy
└── pipe/
└── pipe.go
================================================
FILE CONTENTS
================================================
================================================
FILE: .gitignore
================================================
.DS_Store
================================================
FILE: LICENSE
================================================
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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================================================
FILE: README.md
================================================
## Trudy
Trudy is a transparent proxy that can modify and drop traffic for arbitrary TCP connections. Trudy can be used to programmatically modify TCP traffic for proxy-unaware clients. Trudy creates a 2-way "pipe" for each connection it proxies. The device you are proxying (the "client") connects to Trudy (but doesn't know this) and Trudy connects to the client's intended destination (the "server"). Traffic is then passed between these pipes. Users can create Go functions to mangle data between pipes. [See it in action!](https://asciinema.org/a/7zkywm0biuz1wa64az3tmox8v) For a practical overview, check out [@tsusanka](https://twitter.com/tsusanka)'s very good [blog post](https://blog.susanka.eu/how-to-modify-general-tcp-ip-traffic-on-the-fly-with-trudy) on using Trudy to analyze Telegram's MTProto.
Trudy can also proxy TLS connections. Obviously, you will need a valid certificate or a client that does not validate certificates.
Trudy was designed for monitoring and modifying proxy-unaware devices that use non-HTTP protocols. If you want to monitor, intercept, and modify HTTP traffic, Burp Suite is probably the better option.
## Author
Written by Kelby Ludwig ([@kelbyludwig](https://twitter.com/kelbyludwig))
### Why I Built This
I have done security research that involved sitting between a embedded device and a server and modifying some custom binary protocol on the fly. This usually is a slow process that involves sniffing legitimate traffic, and then rebuilding packets programmatically. Trudy enables Burp-like features for generalized TCP traffic.
### Simple Setup
0. Configure a virtual machine (Trudy has been tested on a 64-bit Debian 8 VM) to shove all traffic through Trudy. I personally use a Vagrant VM that sets this up for me. The Vagrant VM is available [here](https://github.com/praetorian-inc/mitm-vm). If you would like to use different `--to-ports` values, you can use Trudy's command line flags to change Trudy's listening ports.
`iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 8888 -m tcp -j REDIRECT --to-ports 8080`
`iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 443 -m tcp -j REDIRECT --to-ports 6443`
`iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp -j REDIRECT --to-ports 6666`
`ip route del 0/0`
`route add default gw 192.168.1.1 dev eth1`
`sysctl -w net.ipv4.ip_forward=1`
1. Clone the repo on the virtual machine and build the Trudy binary.
`git clone https://github.com/kelbyludwig/trudy.git`
`cd trudy`
`go install`
2. Run the Trudy binary as root. This starts the listeners. If you ran the `iptables` commands above, `iptables` will forward traffic destined for port 443 to port 6443. Trudy listens on this port and expects traffic coming into this port to be TLS. All other TCP connections will be forwarded through port 6666.
`sudo $GOPATH/bin/trudy`
3. Setup your host machine to use the virtual machine as its router. You should see connections being made in Trudy's console but not notice any traffic issues on the host machine (except TLS errors).
4. In order to manipulate data, just implement whatever functions you might need within the `module` package. The default implementations for these functions are hands-off, so if they do not make sense for your situation, feel free to leave them as they are. More detailed documentation is in the `module` package and the data flow is detailed below.
5. To access the interceptor, visit `http://:8888/` in your web browser. The only gotcha here is you must visit the interceptor after starting Trudy but before Trudy receives a packet that it wants to intercept.
## Data Flow
Module methods are called in this order. Downward arrows indicate a branch if the `Do*` function returns true.
```
Deserialize -> Drop -> DoMangle -> DoIntercept -> DoPrint -> Serialize -> BeforeWriteTo(Server|Client) -> AfterWriteTo(Server|Client)
| / | /
|_> Mangle |_> PrettyPrint
```
================================================
FILE: certificate/the-password-is-password
================================================
================================================
FILE: certificate/trudy.cer
================================================
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
================================================
FILE: certificate/trudy.key
================================================
Bag Attributes
localKeyID: B4 DD 83 44 94 4D 94 7F 67 07 A7 D1 53 4E F6 19 B6 9D F4 67
Key Attributes:
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
================================================
FILE: certificate/trudy.pem
================================================
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
================================================
FILE: listener/listener.go
================================================
package listener
import (
"crypto/tls"
"errors"
"net"
)
//The TrudyListener interface is used to listen for incoming connections and accept them. This is almost
//the same as the typical Listener interface, except a net.Conn must be returned for Accept. This enables
//Trudy to grab the original destination IP address from the kernel.
type TrudyListener interface {
//TODO: Listen should take two strings: "tcp" or "udp" and a port to listen on.
//This parameter could create a Listener for both tcp and udp.
Listen(string, *net.TCPAddr, *tls.Config)
//Accept returns a generic net.Conn and the file descriptor of the socket.
Accept() (int, net.Conn, error)
//Close shuts down the listener.
Close() error
}
//The TCPListener struct implements the TrudyListener interface and handles TCP connections.
type TCPListener struct {
Listener *net.TCPListener
}
func (tl *TCPListener) Listen(nets string, tcpAddr *net.TCPAddr, _ *tls.Config) {
tcpListener, err := net.ListenTCP(nets, tcpAddr)
if err != nil {
panic(err)
}
tl.Listener = tcpListener
}
func (tl *TCPListener) Accept() (fd int, conn net.Conn, err error) {
cpointer, err := tl.Listener.AcceptTCP()
if err != nil {
return
}
file, err := cpointer.File()
if err != nil {
return
}
fd = int(file.Fd())
conn, err = net.FileConn(file)
if err != nil {
return
}
return
}
func (tl *TCPListener) Close() error {
return tl.Listener.Close()
}
//TLSListener struct implements the TrudyListener interface and handles TCP connections over TLS.
type TLSListener struct {
Listener *net.TCPListener
Config *tls.Config
}
func (tl *TLSListener) Accept() (fd int, conn net.Conn, err error) {
cpointer, err := tl.Listener.AcceptTCP()
if err != nil {
return
}
file, err := cpointer.File()
if err != nil {
return
}
fd = int(file.Fd())
fconn, err := net.FileConn(file)
if err != nil {
return
}
conn = tls.Server(fconn, tl.Config)
return
}
func (tl *TLSListener) Listen(nets string, laddr *net.TCPAddr, config *tls.Config) {
if len(config.Certificates) == 0 {
panic(errors.New("tls.Listen: no certificates in configuration"))
}
tcpListener, err := net.ListenTCP(nets, laddr)
if err != nil {
panic(err)
}
tl.Listener = tcpListener
tl.Config = config
}
func (tl *TLSListener) Close() error {
return tl.Listener.Close()
}
================================================
FILE: main.go
================================================
package main
import (
"crypto/tls"
"encoding/hex"
"flag"
"fmt"
"github.com/gorilla/websocket"
"github.com/praetorian-inc/trudy/listener"
"github.com/praetorian-inc/trudy/module"
"github.com/praetorian-inc/trudy/pipe"
"io"
"log"
"net"
"net/http"
"strings"
"sync"
)
var connectionCount uint
var websocketConn *websocket.Conn
var websocketMutex *sync.Mutex
var tlsConfig *tls.Config
func main() {
var tcpport string
var tlsport string
var x509 string
var key string
var showConnectionAttempts bool
flag.StringVar(&tcpport, "tcp", "6666", "Listening port for non-TLS connections.")
flag.StringVar(&tlsport, "tls", "6443", "Listening port for TLS connections.")
flag.StringVar(&x509, "x509", "./certificate/trudy.cer", "Path to x509 certificate that will be presented for TLS connection.")
flag.StringVar(&key, "key", "./certificate/trudy.key", "Path to the corresponding private key for the specified x509 certificate")
flag.BoolVar(&showConnectionAttempts, "show", true, "Show connection open and close messages")
flag.Parse()
tcpport = ":" + tcpport
tlsport = ":" + tlsport
setup(tcpport, tlsport, x509, key, showConnectionAttempts)
}
func setup(tcpport, tlsport, x509, key string, show bool) {
//Setup non-TLS TCP listener!
tcpAddr, err := net.ResolveTCPAddr("tcp", tcpport)
if err != nil {
log.Printf("There appears to be an error with the TCP port you specified. See error below.\n%v\n", err.Error())
return
}
tcpListener := new(listener.TCPListener)
//Setup TLS listener!
trdy, err := tls.LoadX509KeyPair(x509, key)
if err != nil {
log.Printf("There appears to be an error with the x509 or key values specified. See error below.\n%v\n", err.Error())
return
}
tlsConfig = &tls.Config{
Certificates: []tls.Certificate{trdy},
InsecureSkipVerify: true,
}
tlsAddr, err := net.ResolveTCPAddr("tcp", tlsport)
if err != nil {
log.Printf("There appears to be an error with the TLS port specified. See error below.\n%v\n", err.Error())
return
}
tlsListener := new(listener.TLSListener)
//All good. Start listening.
tcpListener.Listen("tcp", tcpAddr, &tls.Config{})
tlsListener.Listen("tcp", tlsAddr, tlsConfig)
log.Println("[INFO] Trudy lives!")
log.Printf("[INFO] Listening for TLS connections on port %s\n", tlsport)
log.Printf("[INFO] Listening for all other TCP connections on port %s\n", tcpport)
go websocketHandler()
go connectionDispatcher(tlsListener, "TLS", show)
connectionDispatcher(tcpListener, "TCP", show)
}
func connectionDispatcher(listener listener.TrudyListener, name string, show bool) {
defer listener.Close()
for {
fd, conn, err := listener.Accept()
if err != nil {
continue
}
p := new(pipe.TrudyPipe)
if name == "TLS" {
err = p.New(connectionCount, fd, conn, true)
} else {
err = p.New(connectionCount, fd, conn, false)
}
if err != nil {
log.Println("[ERR] Error creating new pipe.")
continue
}
if show {
log.Printf("[INFO] ( %v ) %v Connection accepted!\n", connectionCount, name)
}
go clientHandler(p, show)
go serverHandler(p)
connectionCount++
}
}
func errHandler(err error) {
if err != nil {
panic(err)
}
}
//clientHandler manages data that is sent from the client to the server.
func clientHandler(pipe pipe.Pipe, show bool) {
if show {
defer log.Printf("[INFO] ( %v ) Closing TCP connection.\n", pipe.Id())
}
defer pipe.Close()
buffer := make([]byte, 65535)
for {
bytesRead, clientReadErr := pipe.ReadFromClient(buffer)
if clientReadErr != io.EOF && clientReadErr != nil {
break
}
if clientReadErr != io.EOF && bytesRead == 0 {
continue
}
data := module.Data{FromClient: true,
Bytes: buffer[:bytesRead],
TLSConfig: tlsConfig,
ServerAddr: pipe.ServerInfo(),
ClientAddr: pipe.ClientInfo()}
data.Deserialize()
if data.Drop() {
continue
}
if data.DoMangle() {
data.Mangle()
bytesRead = len(data.Bytes)
}
if data.DoIntercept() {
if websocketConn == nil {
log.Printf("[ERR] Websocket Connection has not been setup yet! Cannot intercept.")
continue
}
websocketMutex.Lock()
bs := fmt.Sprintf("% x", data.Bytes)
if err := websocketConn.WriteMessage(websocket.TextMessage, []byte(bs)); err != nil {
log.Printf("[ERR] Failed to write to websocket: %v\n", err)
websocketMutex.Unlock()
continue
}
_, moddedBytes, err := websocketConn.ReadMessage()
websocketMutex.Unlock()
if err != nil {
log.Printf("[ERR] Failed to read from websocket: %v\n", err)
continue
}
str := string(moddedBytes)
str = strings.Replace(str, " ", "", -1)
moddedBytes, err = hex.DecodeString(str)
if err != nil {
log.Printf("[ERR] Failed to decode hexedited data.")
continue
}
data.Bytes = moddedBytes
bytesRead = len(moddedBytes)
}
if data.DoPrint() {
log.Printf("%v -> %v\n%v\n", data.ClientAddr.String(), data.ServerAddr.String(), data.PrettyPrint())
}
data.Serialize()
data.BeforeWriteToServer(pipe)
bytesRead = len(data.Bytes)
_, serverWriteErr := pipe.WriteToServer(data.Bytes[:bytesRead])
if serverWriteErr != nil || clientReadErr == io.EOF {
break
}
data.AfterWriteToServer(pipe)
}
}
//serverHandler manages data that is sent from the server to the client.
func serverHandler(pipe pipe.Pipe) {
buffer := make([]byte, 65535)
defer pipe.Close()
for {
bytesRead, serverReadErr := pipe.ReadFromServer(buffer)
if serverReadErr != io.EOF && serverReadErr != nil {
break
}
if serverReadErr != io.EOF && bytesRead == 0 {
continue
}
data := module.Data{FromClient: false,
Bytes: buffer[:bytesRead],
TLSConfig: tlsConfig,
ClientAddr: pipe.ClientInfo(),
ServerAddr: pipe.ServerInfo()}
data.Deserialize()
if data.Drop() {
continue
}
if data.DoMangle() {
data.Mangle()
bytesRead = len(data.Bytes)
}
if data.DoIntercept() {
if websocketConn == nil {
log.Printf("[ERR] Websocket Connection has not been setup yet! Cannot intercept.")
continue
}
websocketMutex.Lock()
bs := fmt.Sprintf("% x", data.Bytes)
if err := websocketConn.WriteMessage(websocket.TextMessage, []byte(bs)); err != nil {
log.Printf("[ERR] Failed to write to websocket: %v\n", err)
websocketMutex.Unlock()
continue
}
_, moddedBytes, err := websocketConn.ReadMessage()
websocketMutex.Unlock()
if err != nil {
log.Printf("[ERR] Failed to read from websocket: %v\n", err)
continue
}
str := string(moddedBytes)
str = strings.Replace(str, " ", "", -1)
moddedBytes, err = hex.DecodeString(str)
if err != nil {
log.Printf("[ERR] Failed to decode hexedited data.")
continue
}
data.Bytes = moddedBytes
bytesRead = len(moddedBytes)
}
if data.DoPrint() {
log.Printf("%v -> %v\n%v\n", data.ServerAddr.String(), data.ClientAddr.String(), data.PrettyPrint())
}
data.Serialize()
data.BeforeWriteToClient(pipe)
bytesRead = len(data.Bytes)
_, clientWriteErr := pipe.WriteToClient(data.Bytes[:bytesRead])
if clientWriteErr != nil || serverReadErr == io.EOF {
break
}
data.AfterWriteToClient(pipe)
}
}
func websocketHandler() {
websocketMutex = &sync.Mutex{}
upgrader := websocket.Upgrader{ReadBufferSize: 65535, WriteBufferSize: 65535}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, editor)
})
http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
var err error
websocketConn, err = upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("[ERR] Could not upgrade websocket connection.")
return
}
})
err := http.ListenAndServe(":8080", nil)
if err != nil {
panic(err)
}
}
const editor string = `
~ Trudy Intercept ~
00000000
.
`
================================================
FILE: module/module.go
================================================
package module
import (
"crypto/tls"
"encoding/hex"
"github.com/praetorian-inc/trudy/pipe"
"net"
)
//Data is a thin wrapper that provides metadata that may be useful when mangling bytes on the network.
type Data struct {
FromClient bool //FromClient is true is the data sent is coming from the client (the device you are proxying)
Bytes []byte //Bytes is a byte slice that contians the TCP data
TLSConfig *tls.Config //TLSConfig is a TLS server config that contains Trudy's TLS server certficiate.
ServerAddr net.Addr //ServerAddr is net.Addr of the server
ClientAddr net.Addr //ClientAddr is the net.Addr of the client (the device you are proxying)
}
//DoMangle will return true if Data needs to be sent to the Mangle function.
func (input Data) DoMangle() bool {
return true
}
//Mangle can modify/replace the Bytes values within the Data struct. This can
//be empty if no programmatic mangling needs to be done.
func (input *Data) Mangle() {
}
//Drop will return true if the Data needs to be dropped before going through
//the pipe.
func (input Data) Drop() bool {
return false
}
//PrettyPrint returns the string representation of the data. This string will
//be the value that is logged to the console.
func (input Data) PrettyPrint() string {
return hex.Dump(input.Bytes)
}
//DoPrint will return true if the PrettyPrinted version of the Data struct
//needs to be logged to the console.
func (input Data) DoPrint() bool {
return true
}
//DoIntercept returns true if data should be sent to the Trudy interceptor.
func (input Data) DoIntercept() bool {
return false
}
//Deserialize should replace the Data struct's Bytes with a deserialized bytes.
//For example, unpacking a HTTP/2 frame would be deserialization.
func (input *Data) Deserialize() {
}
//Serialize should replace the Data struct's Bytes with the serialized form of
//the bytes. The serialized bytes will be sent over the wire.
func (input *Data) Serialize() {
}
//BeforeWriteToClient is a function that will be called before data is sent to
//a client.
func (input *Data) BeforeWriteToClient(p pipe.Pipe) {
}
//AfterWriteToClient is a function that will be called after data is sent to
//a client.
func (input *Data) AfterWriteToClient(p pipe.Pipe) {
}
//BeforeWriteToServer is a function that will be called before data is sent to
//a server.
func (input *Data) BeforeWriteToServer(p pipe.Pipe) {
}
//AfterWriteToServer is a function that will be called after data is sent to
//a server.
func (input *Data) AfterWriteToServer(p pipe.Pipe) {
}
================================================
FILE: module/xmpp.go.trudy
================================================
package module
import (
"bytes"
"crypto/tls"
"encoding/hex"
"github.com/praetorian-inc/trudy/pipe"
"log"
"net"
"strings"
)
//Data is a wrapper that provides metadata that may be useful when mangling bytes on the network.
type Data struct {
FromClient bool //FromClient is true is the data sent is coming from the client (the device you are proxying)
Bytes []byte //Bytes is a byte slice that contians the TCP data
TLSConfig *tls.Config //TLSConfig is a TLS server config that contains Trudy's TLS server certficiate.
ServerAddr net.Addr //ServerAddr is net.Addr of the server
ClientAddr net.Addr //ClientAddr is the net.Addr of the client (the device you are proxying)
}
var startTLSElementSingle string = ""
var startTLSElementDouble string = ""
var proceedElementDouble string = ""
var proceedElementSingle string = ""
//DoPrint will return true if the PrettyPrinted version of the Data struct
//needs to be logged to the console.
func (input Data) DoPrint() bool {
//Only print client/server data sent over XMPP Ports.
return strings.Contains(input.ServerAddr.String(), ":5225") || strings.Contains(input.ClientAddr.String(), ":5225")
}
//AfterWriteToServer is a function that will be called after data is sent to
//a server.
func (input *Data) AfterWriteToServer(p pipe.Pipe) {
if bytes.Contains(input.Bytes, []byte(startTLSElementDouble)) ||
bytes.Contains(input.Bytes, []byte(startTLSElementSingle)) {
//The client has sent StartTLS response to the server's StartTLS
//request. Trudy will now handle that upgrade.
log.Printf("[INFO] ( %v ) Upgrading client-side connection.\n", p.Id())
//Upgrade the connection and prepare for a ClientHandshake
tlsConn := tls.Server(p.ClientConn(), input.TLSConfig)
//Tell the client to proceed. We will drop the server's real proceed.
p.WriteToClient([]byte(proceedElementDouble))
log.Printf("[INFO] ( %v ) Sent client a proceed. Now locking own goroutine to allow server-side upgrade.\n", p.Id())
//Lock this pipe until the server-side TLS upgrade has completed.
p.Lock() //TODO(kkl): This is kinda hacky. I think a chan will be better here.
p.Lock()
//Once this code has been reached, the server-side TLS
//connection has been upgraded. The client-side can now proceed
//with a TLS upgrade.
err := tlsConn.Handshake()
if err != nil {
p.Close()
return
}
//Update the client-side connection with the new TLS connection
//and unlock the pipe.
p.SetClientConn(tlsConn)
p.Unlock()
log.Printf("[INFO] ( %v ) Upgraded client-side connection.\n", p.Id())
}
}
//BeforeWriteToClient is a function that will be called before data is sent to
//a client.
func (input *Data) BeforeWriteToClient(p pipe.Pipe) {
if bytes.Contains(input.Bytes, []byte(proceedElementDouble)) ||
bytes.Contains(input.Bytes, []byte(proceedElementSingle)) {
//We have recieved a proceed from the server. Trudy will
//now upgrade the server-side connection.
log.Printf("[INFO] ( %v ) Upgrading server-side connection.\n", p.Id())
tlsConfig := tls.Config{InsecureSkipVerify: true}
tlsConn := tls.Client(p.ServerConn(), &tlsConfig)
p.SetServerConn(tlsConn)
//Lets drop the proceed message so its not sent to the client. (Since Trudy already sent one)
log.Printf("[INFO] ( %v ) Dropping the server's proceed.\n", p.Id())
input.Bytes = []byte{}
p.Unlock()
log.Printf("[INFO] ( %v ) Upgraded server-side connection.\n", p.Id())
}
}
//
//
// Unmodified module methods. All methods past this point are using the default implementation.
//
//
//DoIntercept returns true if data should be sent to the Trudy interceptor.
func (input Data) DoIntercept() bool {
return false
}
//Mangle can modify/replace the Bytes values within the Data struct. This can
//be empty if no programmatic mangling needs to be done.
func (input *Data) Mangle() {
}
//PrettyPrint returns the string representation of the data. This string will
//be the value that is logged to the console.
func (input Data) PrettyPrint() string {
return hex.Dump(input.Bytes)
}
//Deserialize should replace the Data struct's Bytes with a deserialized bytes.
//For example, unpacking a HTTP/2 frame would be deserialization.
func (input *Data) Deserialize() {
}
//Serialize should replace the Data struct's Bytes with the serialized form of
//the bytes. The serialized bytes will be sent over the wire.
func (input *Data) Serialize() {
}
//DoMangle will return true if Data needs to be sent to the Mangle function.
func (input Data) DoMangle() bool {
return false
}
//Drop will return true if the Data needs to be dropped before going through
//the pipe.
func (input Data) Drop() bool {
return false
}
//AfterWriteToClient is a function that will be called after data is sent to
//a client.
func (input *Data) AfterWriteToClient(p pipe.Pipe) {
}
//BeforeWriteToServer is a function that will be called before data is sent to
//a server.
func (input *Data) BeforeWriteToServer(p pipe.Pipe) {
}
================================================
FILE: pipe/pipe.go
================================================
//Package pipe defines the data structure used to manipulate, monitor, and create proxied connections.
package pipe
import (
"crypto/tls"
"log"
"net"
"strconv"
"sync"
"syscall"
"time"
)
//Netfilter/iptables adds a tcp header to identify original destination.
//Since all traffic is routed through trudy, we need to retrieve the original
//intended destination (i.e. _not_ trudy)
const SO_ORIGINAL_DST = 80
//Pipe is the primary interface that handles connections. Pipe creates a
//full-duplex pipe that passes data from the client to the server and vice
//versa. A pipe is compromised of two connections. The client transparently
//connects to Trudy, and Trudy accepts the connection. Trudy will then make a
//connection with the client's intended destination and just pass traffic
//back-and-forth between the two connections. All modifications and drops to
//the packet happen to data between the two ends of the pipe.
type Pipe interface {
//Id returns a unique Pipe identifier
Id() uint
//ServerInfo returns the net.Addr of the server-end of the pipe.
ServerInfo() (addr net.Addr)
//ClientInfo returns the net.Addr of the client-end of the pipe.
ClientInfo() (addr net.Addr)
//ReadFromClient reads data into the buffer from the client-end of the
//pipe. ReadFromClient returns the number of bytes read and an error
//value if an error or EOF occurred. Note: ReadFromClient can read a
//non-zero number of bytes and have a non-nil error value (e.g. EOF).
ReadFromClient(buffer []byte) (n int, err error)
//WriteToClient writes data to the client-end of the pipe. This is
//typically the proxy-unaware client.
WriteToClient(buffer []byte) (n int, err error)
//ReadFromServer reads data into the buffer from the server-end of the
//pipe. The server is the proxy-unaware client's intended destination.
//ReadFromServer returns the number of bytes read and an error value if
//an error or EOF occurred. Note: ReadFromServer can read a non-zero
//number of bytes and have a non-nil error value (e.g. EOF).
ReadFromServer(buffer []byte) (n int, err error)
//WriteToServer writes buffer to the server-end of the pipe. The server
//is the proxy-unaware client's intended destination.
WriteToServer(buffer []byte) (n int, err error)
//ServerConn returns the net.Conn responsible for server-end
//communication.
ServerConn() (conn net.Conn)
//CilentConn returns the net.Conn responsible for client-end
//communication.
ClientConn() (conn net.Conn)
//SetServerConn will replace the server-end of the pipe with the supplied
//net.Conn parameter.
SetServerConn(conn net.Conn)
//SetClientConn will replace the client-end of the pipe with the supplied
//net.Conn parameter.
SetClientConn(conn net.Conn)
//New builds a new Pipe.
New(pipeID uint, clientConnFD int, clientConn net.Conn, useTLS bool) (err error)
//Close closes both connections of the Pipe.
Close()
//Lock locks a per-Pipe mutex that can be used in modules for
//synchronization.
Lock()
//Unlock unlocks a per-Pipe mutex that can be used in modules for
//synchronization.
Unlock()
//AddContext adds a key/value pair to the Pipe.
AddContext(key string, value interface{})
//GetContext retrieves a value in a Pipe key/value data store.
//GetContext returns the value and a bool indicating success.
GetContext(key string) (value interface{}, ok bool)
//DeleteContext removes a key/value pair from the Pipe.
DeleteContext(key string)
}
//TODO(kkl): I don't think New needs to be part of the Pipe interface.
//Removing this very specific constructor will allow for other methods
//of getting trudy as a proxy (e.g. other transparent proxies, or
//non-transparent proxies like SOCKS).
//TrudyPipe implements the Pipe interface and can be used to proxy TCP connections.
type TrudyPipe struct {
id uint
serverConn net.Conn
clientConn net.Conn
pipeMutex *sync.Mutex
userMutex *sync.Mutex
KV map[string]interface{}
}
//Lock locks a mutex stored within TrudyPipe to allow for fine-grained
//synchronization within a module.
func (t *TrudyPipe) Lock() {
t.userMutex.Lock()
}
//Unlock unlocks a mutex stored within TrudyPipe to allow for fine-grained
//synchronization within a module.
func (t *TrudyPipe) Unlock() {
t.userMutex.Unlock()
}
//AddContext adds a key/value pair to the TrudyPipe. The key/value
//pair data store is per-TrudyPipe. AddContext is safe for use
//in multiple goroutines.
func (t *TrudyPipe) AddContext(key string, value interface{}) {
t.pipeMutex.Lock()
t.KV[key] = value
t.pipeMutex.Unlock()
}
//GetContext retrieves a value in a TrudyPipe key/value data store.
//GetContext returns the value and a bool indicating success.
func (t *TrudyPipe) GetContext(key string) (retval interface{}, ok bool) {
retval, ok = t.KV[key]
return
}
//DeleteContext removes a key/value pair from the TrudyPipe. DeleteContext is
//safe for use in multiple goroutines.
func (t *TrudyPipe) DeleteContext(key string) {
t.pipeMutex.Lock()
delete(t.KV, key)
t.pipeMutex.Unlock()
}
//CilentConn returns the net.Conn responsible for client-end communication.
func (t *TrudyPipe) ClientConn() net.Conn {
return t.clientConn
}
//ServerConn returns the net.Conn responsible for server-end communication.
func (t *TrudyPipe) ServerConn() net.Conn {
return t.serverConn
}
//SetClientConn will replace the client-end of the pipe with the supplied
//net.Conn parameter. SetClientConn is safe for use in multiple goroutines.
func (t *TrudyPipe) SetClientConn(c net.Conn) {
t.pipeMutex.Lock()
t.clientConn = c
t.pipeMutex.Unlock()
}
//SetServerConn will replace the server-end of the pipe with the supplied
//net.Conn parameter. SetServerConn is safe for use in multiple goroutines.
func (t *TrudyPipe) SetServerConn(s net.Conn) {
t.pipeMutex.Lock()
t.serverConn = s
t.pipeMutex.Unlock()
}
//Id returns a TrudyPipe identifier
func (t *TrudyPipe) Id() uint {
return t.id
}
//ServerInfo returns the net.Addr of the server.
func (t *TrudyPipe) ServerInfo() (addr net.Addr) {
addr = t.serverConn.RemoteAddr()
return
}
//ClientInfo returns the net.Addr of the client.
func (t *TrudyPipe) ClientInfo() (addr net.Addr) {
addr = t.clientConn.RemoteAddr()
return
}
//Close closes both ends of a TrudyPipe.
func (t *TrudyPipe) Close() {
t.serverConn.Close()
t.clientConn.Close()
}
//ReadFromClient reads data from the client end of the pipe. This is typically the proxy-unaware client.
func (t *TrudyPipe) ReadFromClient(buffer []byte) (n int, err error) {
//TODO(kkl): Make timeouts configureable.
err = t.clientConn.SetReadDeadline(time.Now().Add(15 * time.Second))
if err != nil {
return
}
n, err = t.clientConn.Read(buffer)
return
}
//WriteToClient writes data to the client end of the pipe. This is typically the proxy-unaware client.
func (t *TrudyPipe) WriteToClient(buffer []byte) (n int, err error) {
//TODO(kkl): Make timeouts configureable.
err = t.clientConn.SetWriteDeadline(time.Now().Add(15 * time.Second))
if err != nil {
return
}
n, err = t.clientConn.Write(buffer)
return
}
//ReadFromServer reads data from the server end of the pipe. The server is the
//proxy-unaware client's intended destination.
func (t *TrudyPipe) ReadFromServer(buffer []byte) (n int, err error) {
t.serverConn.SetReadDeadline(time.Now().Add(15 * time.Second))
return t.serverConn.Read(buffer)
}
//WriteToServer writes data to the server end of the pipe. The server is the
//proxy-unaware client's intended destination.
func (t *TrudyPipe) WriteToServer(buffer []byte) (n int, err error) {
err = t.serverConn.SetWriteDeadline(time.Now().Add(15 * time.Second))
if err != nil {
return
}
n, err = t.serverConn.Write(buffer)
return
}
//byteToConnString converts the Multiaddr bytestring returned by Getsockopt into a "host:port" connection string.
func byteToConnString(multiaddr [16]byte) string {
ip := multiaddr[4:8]
ipString := net.IPv4(ip[0], ip[1], ip[2], ip[3]).String()
port := multiaddr[2:4]
portUint := int64((uint32(port[0]) << 8) + uint32(port[1]))
portString := strconv.FormatInt(portUint, 10)
return (ipString + ":" + portString)
}
//New builds a new TrudyPipe. New will get the original destination of traffic
//that was mangled by iptables and get the original destination. New will then
//open a connection to that original destination and, upon success, will set
//all the internal values needed for a TrudyPipe.
func (t *TrudyPipe) New(id uint, fd int, clientConn net.Conn, useTLS bool) (err error) {
//TODO(kkl): Make the second argument system-dependent. E.g. If a linux machine: syscall.SOL_IP
originalAddrBytes, err := syscall.GetsockoptIPv6Mreq(fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST)
if err != nil {
log.Println("[DEBUG] Getsockopt failed.")
clientConn.Close()
return err
}
var serverConn net.Conn
if useTLS {
tlsconfig := &tls.Config{InsecureSkipVerify: true}
serverConn, err = tls.Dial("tcp", byteToConnString(originalAddrBytes.Multiaddr), tlsconfig)
if err != nil {
log.Printf("[ERR] Unable to connect to destination. Closing connection %v.\n", id)
clientConn.Close()
return err
}
} else {
serverConn, err = net.Dial("tcp", byteToConnString(originalAddrBytes.Multiaddr))
if err != nil {
log.Printf("[ERR] ( %v ) Unable to connect to destination. Closing pipe.\n", id)
clientConn.Close()
return err
}
}
t.id = id
t.clientConn = clientConn
t.serverConn = serverConn
t.pipeMutex = new(sync.Mutex)
t.userMutex = new(sync.Mutex)
return nil
}