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main.go
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main.go
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// Package pan-pingable-hosts harvests pingable IP addresses from a Palo Alto Networks firewall ARP cache
package main
import (
"bytes"
"crypto/tls"
"encoding/base64"
"encoding/xml"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"os"
"sort"
"strings"
"syscall"
"time"
"github.com/fatih/color"
"github.com/go-ping/ping"
"golang.org/x/term"
)
// Create objects to colorize stdout
var (
green = color.New(color.FgGreen)
red = color.New(color.FgRed)
)
type ArpCache struct {
Entries []Interface `xml:"result>entries>entry"`
}
type Interface struct {
Name string `xml:"interface"`
Address string `xml:"ip"`
}
func main() {
var firewall string
var user string
var numAddresses int
var timeout int
var password string
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage of %s:\n\n", os.Args[0])
fmt.Fprintf(os.Stderr, "Harvests pingable IP addresses from a Palo Alto Networks firewall ARP cache\n\n")
fmt.Fprintf(os.Stderr, "USAGE: pan-pingable-hosts [options] <firewall>\n\n")
fmt.Fprintf(os.Stderr, "EXAMPLES:\n")
fmt.Fprintf(os.Stderr, " > pan-pingable-hosts fw01.domain.com\n")
fmt.Fprintf(os.Stderr, " > pan-pingable-hosts -u user panwfw01.corp.com\n")
fmt.Fprintf(os.Stderr, " > pan-pingable-hosts -u user -n 4 panwfw01.corp.com\n\n")
fmt.Fprintf(os.Stderr, "OPTIONS:\n")
flag.PrintDefaults()
}
flag.StringVar(&user, "u", "", "PAN user")
flag.IntVar(&numAddresses, "n", 2, "Number of addresses per interface")
flag.IntVar(&timeout, "t", 250, "ICMP timeout in milliseconds")
flag.Parse()
// Ensure the target firewall is defined, otherwise exit and display usage
if flag.NArg() != 1 {
flag.Usage()
os.Exit(1)
} else {
firewall = flag.Arg(0)
}
fmt.Fprintln(os.Stderr)
if user == "" {
fmt.Fprint(os.Stderr, "PAN User: ")
fmt.Scanln(&user)
}
fmt.Fprintf(os.Stderr, "Password (%s): ", user)
bytepw, err := term.ReadPassword(int(syscall.Stdin))
if err != nil {
panic(err)
}
password = string(bytepw)
fmt.Fprintf(os.Stderr, "\n\n")
start := time.Now()
fmt.Fprintf(os.Stderr, "Downloading ARP cache from %v ... ", firewall)
data := getArpCache(firewall, user, password)
var arpCache ArpCache
err = xml.Unmarshal([]byte(data), &arpCache)
if err != nil {
red.Fprintf(os.Stderr, "fail\n\n")
panic(err)
}
green.Fprintf(os.Stderr, "success\n")
fmt.Fprintf(os.Stderr, "Parsing ARP cache ... ")
// Create a map of interfaces with a slice of addresses
interfaces := make(map[string][]string)
for _, int := range arpCache.Entries {
interfaces[int.Name] = append(interfaces[int.Name], int.Address)
}
green.Fprintf(os.Stderr, "success\n")
fmt.Fprintf(os.Stderr, "Pinging IP addresses ... ")
// Harvest pingable addresses from each interface
var pingableHosts []string
for _, addrs := range interfaces {
pingableHosts = append(pingableHosts, getPingableAddresses(addrs, numAddresses, timeout)...)
}
green.Fprintf(os.Stderr, "success\n\n")
// Sort the pingableHosts slice
pingableHostsSorted := make([]net.IP, 0, len(pingableHosts))
for _, ip := range pingableHosts {
pingableHostsSorted = append(pingableHostsSorted, net.ParseIP(ip))
}
sort.Slice(pingableHostsSorted, func(i int, j int) bool {
return bytes.Compare(pingableHostsSorted[i], pingableHostsSorted[j]) < 0
})
// Print results
for _, addr := range pingableHostsSorted {
fmt.Println(addr)
}
fmt.Fprintln(os.Stderr)
// Print summary
elapsed := time.Since(start)
fmt.Fprintf(os.Stderr, " Collection complete: Discovered %d pingable addresses in %.3f seconds\n", len(pingableHosts), elapsed.Seconds())
}
func getPingableAddresses(addrs []string, numAddrs int, timeout int) []string {
var pingableAddrs []string
for _, addr := range addrs {
// If ip addr begins with 0 skip iteration
if strings.HasPrefix(addr, "0") {
continue
}
// Ping ip addr and add to pingableAddrs if a response is received
stats := pingAddr(addr, timeout)
if stats.PacketLoss == 0 {
pingableAddrs = append(pingableAddrs, addr)
}
// skip remaining addrs if pingableAddrs is eqaul to numAddrs
if len(pingableAddrs) == numAddrs {
break
}
}
return pingableAddrs
}
func pingAddr(addr string, timeout int) *ping.Statistics {
// ping ip addr
pinger, err := ping.NewPinger(addr)
if err != nil {
panic(err)
}
pinger.SetPrivileged(true)
pinger.Timeout = time.Duration((time.Duration(timeout) * time.Millisecond))
pinger.Count = 1
err = pinger.Run()
if err != nil {
log.Fatalf("ICMP socket operations require 'sudo'\n")
}
stats := pinger.Statistics()
return stats
}
func getArpCache(fw string, user string, pw string) string {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: tr}
url := fmt.Sprintf("https://%s/api/", fw)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
red.Fprintf(os.Stderr, "fail\n\n")
panic(err)
}
creds := fmt.Sprintf("%s:%s", user, pw)
credsEnc := base64.StdEncoding.EncodeToString([]byte(creds))
req.Header.Set("Authorization", fmt.Sprintf("Basic %s", credsEnc))
q := req.URL.Query()
q.Add("type", "op")
q.Add("cmd", "<show><arp><entry name = 'all'/></arp></show>")
req.URL.RawQuery = q.Encode()
resp, err := client.Do(req)
if err != nil {
red.Fprintf(os.Stderr, "fail\n\n")
panic(err)
}
if resp.StatusCode != 200 {
red.Fprintf(os.Stderr, "fail\n\n")
log.Fatal(resp.Status)
}
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
red.Fprintf(os.Stderr, "fail\n\n")
panic(err)
}
return string(respBody)
}