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connection.go
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connection.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 maltego
import (
"errors"
"fmt"
"io"
"log"
"os"
"path/filepath"
"sort"
"strings"
"github.com/dreadl0ck/maltego"
"github.com/gogo/protobuf/proto"
"github.com/dreadl0ck/netcap/defaults"
netio "github.com/dreadl0ck/netcap/io"
"github.com/dreadl0ck/netcap/resolvers"
"github.com/dreadl0ck/netcap/types"
)
// connCountFunc is a function that counts something over multiple conn audit records.
type connCountFunc = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int)
// countIncomingConnBytes returns the lowest and highest number of bytes transferred as well as an array of sizes
// seen for all incoming conns for a given ip address.
//goland:noinspection GoUnusedGlobalVariable
var countIncomingConnBytes = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.DstIP == ipaddr {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
}
// CountIncomingConnBytesFiltered countIncomingconnPackets returns the lowest and highest number of bytes transferred as well as an array of sizes
// seen for all incoming conns for a given ip address
// filtered against the domain whitelist.
var CountIncomingConnBytesFiltered = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.DstIP == ipaddr {
name := resolvers.LookupDNSNameLocal(conn.SrcIP)
if name != "" {
if !resolvers.IsWhitelistedDomain(name) {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
} else {
// bare IP
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
}
}
// countIncomingConnPackets returns the lowest and highest number of packets as well as an array of sizes
// seen for all incoming conns for a given ip address.
//goland:noinspection GoUnusedGlobalVariable
var countIncomingConnPackets = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.DstIP == ipaddr {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.NumPackets) < *min {
*min = uint64(conn.NumPackets)
}
if uint64(conn.NumPackets) > *max {
*max = uint64(conn.NumPackets)
}
}
}
// countOutgoingConnBytes returns the lowest and highest number of bytes transferred as well as an array of sizes
// seen for all outgoing conns from a given ip address
// filtered against the domain whitelist.
//goland:noinspection GoUnusedGlobalVariable
var countOutgoingConnBytes = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.SrcIP == ipaddr {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
}
// CountOutgoingConnBytesFiltered returns the lowest and highest number of bytes transferred as well as an array of sizes
// seen for all outgoing conns from a given ip address
// filtered against the domain whitelist.
var CountOutgoingConnBytesFiltered = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.SrcIP == ipaddr {
name := resolvers.LookupDNSNameLocal(conn.DstIP)
if name != "" {
if !resolvers.IsWhitelistedDomain(name) {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
} else {
// bare IP
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.TotalSize) < *min {
*min = uint64(conn.TotalSize)
}
if uint64(conn.TotalSize) > *max {
*max = uint64(conn.TotalSize)
}
}
}
}
// CountPacketsDevices returns the lowest and highest number of packets as well as an array of sizes
// seen for all outgoing conns from a given ip address.
//goland:noinspection GoUnusedGlobalVariable
var countOutgoingconnPackets = func(conn *types.Connection, ipaddr string, min, max *uint64, sizes *[]int) {
if conn.SrcIP == ipaddr {
*sizes = append(*sizes, int(conn.TotalSize))
if uint64(conn.NumPackets) < *min {
*min = uint64(conn.NumPackets)
}
if uint64(conn.NumPackets) > *max {
*max = uint64(conn.NumPackets)
}
}
}
// connTransformationFunc is a transformation over conn audit records.
type connTransformationFunc = func(lt maltego.LocalTransform, trx *maltego.Transform, conn *types.Connection, min, max uint64, path string, mac string, ip string, sizes *[]int)
// ConnectionTransform applies a maltego transformation over types.Connection audit records.
func ConnectionTransform(count connCountFunc, transform connTransformationFunc) {
var (
lt = maltego.ParseLocalArguments(os.Args[3:])
path = lt.Values["path"]
mac = lt.Values["mac"]
ipaddr = lt.Values[PropertyIpAddr]
dir = filepath.Dir(path)
connAuditRecords = filepath.Join(dir, "Connection.ncap.gz")
trx = maltego.Transform{}
)
netio.FPrintBuildInfo(os.Stderr)
log.Println("opening", connAuditRecords)
f, path := openFile(connAuditRecords)
// check if its an audit record file
if !strings.HasSuffix(f.Name(), defaults.FileExtensionCompressed) && !strings.HasSuffix(f.Name(), defaults.FileExtension) {
maltego.Die("input file must be an audit record file, but got", f.Name())
}
r := openNetcapArchive(path)
// read netcap header
header, errFileHeader := r.ReadHeader()
if errFileHeader != nil {
maltego.Die(errFileHeader.Error(), "failed to read file header")
}
if header != nil && header.Type != types.Type_NC_Connection {
maltego.Die("file does not contain conn records", header.Type.String())
}
var (
conn = new(types.Connection)
pm proto.Message
ok bool
)
pm = conn
if _, ok = pm.(types.AuditRecord); !ok {
panic("type does not implement types.AuditRecord interface")
}
var (
min uint64 = 10000000
max uint64 = 0
sizes []int
err error
)
if count != nil {
for {
err = r.Next(conn)
if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
break
} else if err != nil {
maltego.Die(err.Error(), errUnexpectedReadFailure)
}
count(conn, ipaddr, &min, &max, &sizes)
}
err = r.Close()
if err != nil {
log.Println("failed to close audit record file: ", err)
}
sort.Ints(sizes)
}
r = openNetcapArchive(path)
// read netcap header - ignore err as it has been checked before
_, _ = r.ReadHeader()
var top12 []int
if len(sizes) > 12 {
top12 = sizes[len(sizes)-12:]
}
log.Println("==> top12", top12)
for {
err = r.Next(conn)
if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
break
} else if err != nil {
panic(err)
}
transform(lt, &trx, conn, min, max, path, mac, ipaddr, &top12)
}
err = r.Close()
if err != nil {
log.Println("failed to close audit record file: ", err)
}
trx.AddUIMessage("completed!", maltego.UIMessageInform)
fmt.Println(trx.ReturnOutput())
}