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Added ipv4cat service to help inspect breakouts #4

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Added ipv4cat service to help inspect breakouts #4

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53 changes: 47 additions & 6 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,8 @@ import (
"io/ioutil"
"log"
"math/rand"
"net"
"bufio"
"net/http"
"net/url"
"os"
Expand Down Expand Up @@ -52,6 +54,7 @@ type service struct {
var services = map[string]service{
"letmeout": service{url: "go-out.letmeoutofyour.net", match: "w00tw00t"},
"allports": service{url: "allports.exposed", match: "<p>Open Port</p>"},
"ipv4cat": service{url: "ipv4.cat", match: ""},
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Lets extract TCP services to their own type.

}

// maxedWaitGroup is a type to control the maximum
Expand Down Expand Up @@ -132,7 +135,7 @@ func (service *service) testHTTPEgress(port int) {
if *invertPtr {
_, err := client.Get(url.String())
if err != nil {
fmt.Printf("[!] Looks like we have no egress using %s on port %d\n", url.String(), port)
fmt.Printf("[!] Looks like we have no egress using %s on port %d.\n", url.String(), port)
}
return
}
Expand All @@ -146,19 +149,52 @@ func (service *service) testHTTPEgress(port int) {
panic(err)
}
if strings.Contains(string(body), service.match) && !*invertPtr {
fmt.Printf("[!] Looks like we have egress using %s on port %d\n", url.String(), port)
fmt.Printf("[!] Looks like we have egress using %s on port %d.\n", url.String(), port)
}
}

// testTCPEgress tests if a specific port is allowed to connect
// to the internet via a raw TCP connection by and keeps note of the
// breakout IP address
func (service *service) testTCPEgress(port int) {

timeout := time.Duration(*timeoutPtr) * time.Second

connection := net.Dialer{Timeout: timeout}

conn, err := connection.Dial("tcp", service.url + ":" + strconv.Itoa(port))

if err != nil {
if *invertPtr {
_, err := connection.Dial("tcp", service.url + ":" + strconv.Itoa(port))
if err != nil {
fmt.Printf("[!] Looks like we have no TCP egress using %s on port %d.\n", service.url, port)
}
return
}

return // if the first one errored already, don't continue
}

message, _ := bufio.NewReader(conn).ReadString('\n')
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Lets check the error here in case we never reach the \n.


addr := net.ParseIP(strings.TrimSuffix(message, "\n"))

if addr.To4() != nil && addr.To16() != nil && !*invertPtr {
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To16() may be enough for v4 && v6 checking.

fmt.Printf("[!] Looks like we have TCP egress using %s on port %d and it broke out from %s\n", service.url, port, strings.TrimSuffix(message, "\n"))
}

}

func validateFlags() bool {

// Flag Validation
if !validService(servicePtr) {
fmt.Printf("%s is an invalid service. Please choose 'letmeout' or 'allports'\n", *servicePtr)
fmt.Printf("%s is an invalid service. Please choose 'letmeout', 'allports' or 'ipv4cat'.\n", *servicePtr)
return false
}

if *useHTTPSPtr && *servicePtr != "letmeout" {
if *useHTTPSPtr && *servicePtr != "letmeout" && *servicePtr != "ipv4cat" {
fmt.Println("Only the 'letmeout' service supports HTTPS, disabling HTTPS checking.")
*useHTTPSPtr = false
}
Expand All @@ -183,7 +219,7 @@ func validateFlags() bool {

func main() {

servicePtr = flag.String("service", "letmeout", "Use 'letmeout' or 'allports' for this run.")
servicePtr = flag.String("service", "letmeout", "Use 'letmeout', 'allports' or 'ipv4cat' for this run.")
startPortPtr = flag.Int("start", 1, "The start port to use.")
endPortPtr = flag.Int("end", 65535, "The end port to use.")
concurrentPtr = flag.Int("w", 5, "Number of concurrent workers to spawn.")
Expand Down Expand Up @@ -255,7 +291,12 @@ func main() {
time.Sleep(time.Second * time.Duration(rand.Intn(10)))
}

tester.testHTTPEgress(p)
if *servicePtr == "ipv4cat" {
tester.testTCPEgress(p)
} else {
tester.testHTTPEgress(p)
}

atomic.AddInt64(&status.Done, 1)
atomic.AddInt64(&status.Updated, 1)
bar.Render(os.Stdout)
Expand Down