/
LookupDHCPFingerprint.go
164 lines (142 loc) · 4.75 KB
/
LookupDHCPFingerprint.go
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/*
* NETCAP - Traffic Analysis Framework
* Copyright (c) 2017-2020 Philipp Mieden <dreadl0ck [at] protonmail [dot] ch>
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package transform
import (
"fmt"
"log"
"strings"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"github.com/dreadl0ck/maltego"
netmaltego "github.com/dreadl0ck/netcap/maltego"
"github.com/dreadl0ck/netcap/resolvers"
"github.com/dreadl0ck/netcap/types"
"github.com/dreadl0ck/netcap/utils"
)
func lookupDHCPFingerprint() {
// setup logger for resolvers pkg
resolverLog := zap.New(zapcore.NewNopCore())
defer func() {
err := resolverLog.Sync()
if err != nil {
log.Println(err)
}
}()
resolvers.SetLogger(resolverLog)
// init API key
resolvers.InitDHCPFingerprintAPIKey()
resolvers.InitDHCPFingerprintDB()
// read HTTP audit records and create a map of ips to useragents
userAgentStore := make(map[string][]string)
netmaltego.HTTPTransform(
nil,
func(lt maltego.LocalTransform, trx *maltego.Transform, http *types.HTTP, min, max uint64, path string, ipaddr string) {
if uas, ok := userAgentStore[http.SrcIP]; ok {
for _, u := range uas {
if u == http.UserAgent {
// already collected
return
}
}
// collect
userAgentStore[http.SrcIP] = append(uas, http.UserAgent)
} else {
userAgentStore[http.SrcIP] = []string{http.UserAgent}
}
},
true,
)
log.Println("userAgentStore", len(userAgentStore))
for ip, uas := range userAgentStore {
log.Println(ip, uas)
}
var (
fp, mac, path string
// mapped MAC addresses to IPs
addrMapping = make(map[string]string)
mtrx *maltego.Transform
messageToFingerprint *types.DHCPv4
)
netmaltego.DHCPV4Transform(
nil,
func(lt maltego.LocalTransform, trx *maltego.Transform, dhcp *types.DHCPv4, min, max uint64, path string, ipaddr string) {
if dhcp.Operation == 2 {
if _, ok := addrMapping[dhcp.ClientHWAddr]; !ok {
log.Println("update addr mapping", dhcp.ClientHWAddr, dhcp.YourClientIP)
addrMapping[dhcp.ClientHWAddr] = dhcp.YourClientIP
}
return
}
if fp == "" && mac == "" {
mac = lt.Values["clientMac"]
fp = lt.Values["fp"]
path = lt.Values["path"]
log.Println("searching for mac", mac, "fp", fp)
}
if dhcp.ClientHWAddr == mac && dhcp.Fingerprint == fp { // deep copy
messageToFingerprint = &types.DHCPv4{
Timestamp: dhcp.Timestamp,
Operation: dhcp.Operation,
HardwareType: dhcp.HardwareType,
HardwareLen: dhcp.HardwareLen,
HardwareOpts: dhcp.HardwareOpts,
Xid: dhcp.Xid,
Secs: dhcp.Secs,
Flags: dhcp.Flags,
ClientIP: dhcp.ClientIP,
YourClientIP: dhcp.YourClientIP,
NextServerIP: dhcp.NextServerIP,
RelayAgentIP: dhcp.RelayAgentIP,
ClientHWAddr: dhcp.ClientHWAddr,
ServerName: dhcp.ServerName,
File: dhcp.File,
Options: dhcp.Options,
Fingerprint: dhcp.Fingerprint,
SrcIP: dhcp.SrcIP,
DstIP: dhcp.DstIP,
SrcPort: dhcp.SrcPort,
DstPort: dhcp.DstPort,
}
mtrx = trx
}
},
true,
)
if messageToFingerprint != nil { // search vendor class
var vendor string
for _, o := range messageToFingerprint.Options {
if utils.IsASCII([]byte(o.Data)) && len(o.Data) > 1 {
if o.Type == 60 {
vendor = o.Data
break
}
}
}
ip := addrMapping[messageToFingerprint.ClientHWAddr]
// log.Println("found ip:", ip, "for mac", messageToFingerprint.ClientHWAddr)
userAgents := userAgentStore[ip]
// log.Println("found user agents:", userAgents)
res, err := resolvers.LookupDHCPFingerprint(messageToFingerprint.Fingerprint, vendor, userAgents)
if err != nil {
log.Fatal(err)
}
// log.Println("got result", res.DeviceName, "for", messageToFingerprint.ClientHWAddr)
val := strings.ReplaceAll(res.DeviceName, "/", "\n") + "\n" + ip
ent := addEntityWithPath(mtrx, "netcap.DHCPResult", val, path)
ent.AddProperty("timestamp", "Timestamp", maltego.Strict, utils.UnixTimeToUTC(messageToFingerprint.Timestamp))
ent.AddProperty("clientIP", "ClientIP", maltego.Strict, messageToFingerprint.ClientIP)
ent.AddProperty("serverIP", "ServerIP", maltego.Strict, messageToFingerprint.NextServerIP)
}
mtrx.AddUIMessage("completed!", maltego.UIMessageInform)
fmt.Println(mtrx.ReturnOutput())
}