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capture.go
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capture.go
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package cmd
import (
"bytes"
"encoding/json"
"fmt"
syslog "github.com/RackSec/srslog"
"io/ioutil"
"net/http"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"github.com/spf13/cobra"
stdlog "log"
"github.com/atredispartners/flamingo/pkg/flamingo"
log "github.com/sirupsen/logrus"
)
var protocolCount = 0
var stdoutLogging = false
var cleanupHandlers = []func(){}
func startCapture(cmd *cobra.Command, args []string) {
running := false
state := new(sync.Mutex)
fm := log.FieldMap{
log.FieldKeyTime: "_etime",
log.FieldKeyMsg: "output",
}
// Configure the JSON formatter
log.SetFormatter(&log.JSONFormatter{TimestampFormat: time.RFC3339, FieldMap: fm})
log.SetOutput(os.Stdout)
// Redirect the standard logger to logrus output (for ldap and other libraries)
redirLog := log.New()
redirLog.SetFormatter(&log.JSONFormatter{TimestampFormat: time.RFC3339, FieldMap: fm})
stdlog.SetOutput(redirLog.Writer())
stdlog.SetFlags(0)
// Set debug level if verbose is configured
if params.Verbose {
log.SetLevel(log.DebugLevel)
}
if !params.Quiet {
fmt.Fprintf(os.Stderr, "flamingo %s is waiting to feed...\n", Version)
}
// Bump the process file limit if possible
flamingo.IncreaseFileLimit()
done := false
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
go func() {
<-sigs
state.Lock()
defer state.Unlock()
if !running {
log.Printf("terminating early...")
os.Exit(1)
}
done = true
}()
// Process CLI arguments
protocols := make(map[string]bool)
for _, pname := range strings.Split(params.Protocols, ",") {
pname = strings.TrimSpace(pname)
protocols[pname] = true
}
// Verify HTTP authentication mode
switch params.HTTPAuthMode {
case "ntlm", "basic":
// OK
case "":
// Default to NTLM if empty
params.HTTPAuthMode = "ntlm"
default:
// Bail out early
log.Fatalf("invalid HTTP authentication mode specified: %s", params.HTTPAuthMode)
}
// Configure output actions
rw := setupOutput(args)
// Configure TLS certificates
setupTLS()
// Setup protocol listeners
// SNMP
if _, enabled := protocols["snmp"]; enabled {
setupSNMP(rw)
}
// SSH
if _, enabled := protocols["ssh"]; enabled {
setupSSH(rw)
}
// LDAP/LDAPS
if _, enabled := protocols["ldap"]; enabled {
setupLDAP(rw)
setupLDAPS(rw)
}
// HTTP/HTTPS
if _, enabled := protocols["http"]; enabled {
setupHTTP(rw)
setupHTTPS(rw)
}
// DNS
if _, enabled := protocols["dns"]; enabled {
setupDNS(rw)
}
// FTP
if _, enabled := protocols["ftp"]; enabled {
setupFTP(rw)
}
// Make sure at least one capture is running
if protocolCount == 0 {
log.Fatalf("at least one protocol must be enabled")
}
state.Lock()
running = true
state.Unlock()
// Main loop
for {
if done {
log.Printf("shutting down...")
// Clean up protocol handlers
for _, handler := range cleanupHandlers {
handler()
}
// Stop processing output
rw.Done()
// Clean up output writers
for _, handler := range rw.OutputCleaners {
handler()
}
break
}
time.Sleep(time.Second)
}
}
func setupOutput(outputs []string) *flamingo.RecordWriter {
stdoutLogging := false
rw := flamingo.NewRecordWriter()
// Default logs to standard output and flamingo.log
if len(outputs) == 0 {
outputs = []string{
"stdout",
"flamingo.log",
}
}
if !params.Quiet {
log.Infof("saving credentials to %s", strings.Join(outputs, ", "))
}
for _, output := range outputs {
if (output == "-" || output == "stdout") && !stdoutLogging {
rw.OutputWriters = append(rw.OutputWriters, stdoutWriter)
stdoutLogging = true
continue
}
if strings.HasPrefix(output, "http://") || strings.HasPrefix(output, "https://") {
writer, cleaner, err := getWebhookWriter(output)
if err != nil {
log.Fatalf("failed to configure output %s: %s", output, err)
}
rw.OutputWriters = append(rw.OutputWriters, writer)
if cleaner != nil {
rw.OutputCleaners = append(rw.OutputCleaners, cleaner)
}
continue
}
if strings.HasPrefix(output, "syslog:") || output == "syslog" {
writer, cleaner, err := getSyslogWriter(output)
if err != nil {
log.Fatalf("failed to configure output %s: %s", output, err)
}
rw.OutputWriters = append(rw.OutputWriters, writer)
if cleaner != nil {
rw.OutputCleaners = append(rw.OutputCleaners, cleaner)
}
continue
}
// Assume anything else is a file output
writer, cleaner, err := getFileWriter(output)
if err != nil {
log.Fatalf("failed to configure output %s: %s", output, err)
}
rw.OutputWriters = append(rw.OutputWriters, writer)
if cleaner != nil {
rw.OutputCleaners = append(rw.OutputCleaners, cleaner)
}
continue
}
// Always log to standard output
if !stdoutLogging {
rw.OutputWriters = append(rw.OutputWriters, stdoutWriter)
}
return rw
}
func stdoutWriter(rec map[string]string) error {
lf := log.Fields{}
for k, v := range rec {
if k == "_etime" {
continue
}
lf[k] = v
}
rtype := rec["_type"]
if rtype == "" {
rtype = "credential"
}
switch rtype {
case "credential":
log.WithFields(lf).Warn(rtype)
default:
log.WithFields(lf).Info(rtype)
}
return nil
}
func getFileWriter(path string) (flamingo.OutputWriter, flamingo.OutputCleaner, error) {
fd, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0600)
if err != nil {
return flamingo.OutputWriterNoOp, nil, err
}
return func(rec map[string]string) error {
bytes, err := json.Marshal(rec)
if err != nil {
return err
}
fmt.Fprintln(fd, string(bytes))
return nil
}, func() { fd.Close() }, nil
}
func getWebhookWriter(url string) (flamingo.OutputWriter, flamingo.OutputCleaner, error) {
return func(rec map[string]string) error {
bytes, err := json.Marshal(rec)
if err != nil {
return err
}
return sendWebhook(url, string(bytes))
}, flamingo.OutputCleanerNoOp, nil
}
func getSyslogWriter(url string) (flamingo.OutputWriter, flamingo.OutputCleaner, error) {
var syslogWriter *syslog.Writer
var err error
// Supported formats
// - syslog - send to the default syslog output, typically a unix socket
// - syslog:unix:/dev/log - send to a specific unix stream socket
// - syslog:host - send to the specified host using udp and port 514
// - syslog:host:port - send to the specified host using udp and the specified port
// - syslog:udp:host - send to the specified host using udp and port 514
// - syslog:udp:host:port - send to the specified host using udp and the specified port
// - syslog:tcp:host - send to the specified host using tcp and port 514
// - syslog:tcp:host:port - send to the specified host using tcp and the specified port
// - syslog:tcp+tls:host - send to the specified host using tls over tcp and port 514
// - syslog:tcp+tls:host:port - send to the specified host using tls over tcp and the specified port
bits := strings.Split(url, ":")
switch len(bits) {
case 1:
syslogWriter, err = syslog.Dial("", "", syslog.LOG_ALERT, "flamingo")
case 2:
syslogWriter, err = syslog.Dial("udp", fmt.Sprintf("%s:514", bits[1]), syslog.LOG_ALERT, "flamingo")
case 3:
switch bits[1] {
case "unix":
syslogWriter, err = syslog.Dial("", bits[2], syslog.LOG_ALERT, "flamingo")
case "udp", "tcp", "tcp+tls":
syslogWriter, err = syslog.Dial(bits[1], fmt.Sprintf("%s:514", bits[2]), syslog.LOG_ALERT, "flamingo")
default:
syslogWriter, err = syslog.Dial("udp", fmt.Sprintf("%s:%s", bits[1], bits[2]), syslog.LOG_ALERT, "flamingo")
}
case 4:
switch bits[1] {
case "unix":
syslogWriter, err = syslog.Dial("", bits[2], syslog.LOG_ALERT, "flamingo")
case "udp", "tcp", "tcp+tls":
syslogWriter, err = syslog.Dial(bits[1], fmt.Sprintf("%s:%s", bits[2], bits[3]), syslog.LOG_ALERT, "flamingo")
default:
err = fmt.Errorf("unsupported syslog transport %s", bits[1])
}
default:
err = fmt.Errorf("unsupported syslog destination %s", url)
}
if err != nil {
return flamingo.OutputWriterNoOp, flamingo.OutputCleanerNoOp, err
}
err = syslogWriter.Debug("flamingo is starting up")
if err != nil {
return flamingo.OutputWriterNoOp, flamingo.OutputCleanerNoOp, err
}
return func(rec map[string]string) error {
msg, err := json.Marshal(rec)
if err != nil {
return err
}
rtype := rec["_type"]
if rtype == "" {
rtype = "credential"
}
switch rtype {
case "credential":
syslogWriter.Alert(string(msg))
default:
syslogWriter.Info(string(msg))
}
return nil
}, func() { syslogWriter.Close() }, nil
}
func setupTLS() {
tlsCertData := ""
tlsKeyData := ""
if params.TLSCertFile != "" {
raw, err := ioutil.ReadFile(params.TLSCertFile)
if err != nil {
log.Fatalf("failed to read TLS certificate: %s", err)
}
tlsCertData = string(raw)
tlsKeyData = tlsCertData
if params.TLSKeyFile != "" {
rawKey, err := ioutil.ReadFile(params.TLSKeyFile)
if err != nil {
log.Fatalf("failed to read TLS certificate: %s", err)
}
tlsKeyData = string(rawKey)
}
}
if tlsCertData == "" || tlsKeyData == "" {
generateTLSCertificate()
}
}
func setupSSH(rw *flamingo.RecordWriter) {
sshHostKey := ""
if params.SSHHostKey != "" {
data, err := ioutil.ReadFile(params.SSHHostKey)
if err != nil {
log.Fatalf("failed to read ssh host key %s: %s", params.SSHHostKey, err)
}
sshHostKey = string(data)
}
if params.SSHHostKey == "" {
pkey, err := flamingo.SSHGenerateRSAKey(2048)
if err != nil {
log.Fatalf("failed to create ssh host key: %s", err)
}
sshHostKey = string(pkey)
}
// Create a listener for each port
sshPorts, err := flamingo.CrackPorts(params.SSHPorts)
if err != nil {
log.Fatalf("failed to process ssh ports %s: %s", params.SSHPorts, err)
}
for _, port := range sshPorts {
port := port
sshConf := flamingo.NewConfSSH()
sshConf.PrivateKey = sshHostKey
sshConf.BindPort = uint16(port)
sshConf.RecordWriter = rw
if err := flamingo.SpawnSSH(sshConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start ssh server %s:%d: %s", sshConf.BindHost, sshConf.BindPort, err)
} else {
log.Errorf("failed to start ssh server %s:%d: %s", sshConf.BindHost, sshConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { sshConf.Shutdown() })
}
}
func setupSNMP(rw *flamingo.RecordWriter) {
// Create a listener for each port
snmpPorts, err := flamingo.CrackPorts(params.SNMPPorts)
if err != nil {
log.Fatalf("failed to process snmp ports %s: %s", params.SSHPorts, err)
}
for _, port := range snmpPorts {
port := port
snmpConf := flamingo.NewConfSNMP()
snmpConf.BindPort = uint16(port)
snmpConf.RecordWriter = rw
if err := flamingo.SpawnSNMP(snmpConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start snmp server %s:%d: %s", snmpConf.BindHost, snmpConf.BindPort, err)
} else {
log.Errorf("failed to start snmb server %s:%d: %s", snmpConf.BindHost, snmpConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { snmpConf.Shutdown() })
}
}
func setupLDAP(rw *flamingo.RecordWriter) {
// Create a listener for each port
ldapPorts, err := flamingo.CrackPorts(params.LDAPPorts)
if err != nil {
log.Fatalf("failed to process ldap ports %s: %s", params.LDAPPorts, err)
}
for _, port := range ldapPorts {
port := port
ldapConf := flamingo.NewConfLDAP()
ldapConf.BindPort = uint16(port)
ldapConf.RecordWriter = rw
if err := flamingo.SpawnLDAP(ldapConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start ldap server %s:%d: %s", ldapConf.BindHost, ldapConf.BindPort, err)
} else {
log.Errorf("failed to start ldap server %s:%d: %s", ldapConf.BindHost, ldapConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { ldapConf.Shutdown() })
}
}
func setupLDAPS(rw *flamingo.RecordWriter) {
// Create a listener for each port
ldapsPorts, err := flamingo.CrackPorts(params.LDAPSPorts)
if err != nil {
log.Fatalf("failed to process ldap ports %s: %s", params.LDAPSPorts, err)
}
for _, port := range ldapsPorts {
port := port
ldapConf := flamingo.NewConfLDAP()
ldapConf.BindPort = uint16(port)
ldapConf.RecordWriter = rw
ldapConf.TLS = true
ldapConf.TLSCert = params.TLSCertData
ldapConf.TLSKey = params.TLSKeyData
ldapConf.TLSName = params.TLSName
if err := flamingo.SpawnLDAP(ldapConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start ldaps server %s:%d: %q", ldapConf.BindHost, ldapConf.BindPort, err)
} else {
log.Errorf("failed to start ldaps server %s:%d: %q", ldapConf.BindHost, ldapConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { ldapConf.Shutdown() })
}
}
func setupHTTP(rw *flamingo.RecordWriter) {
// Create a listener for each port
httpPorts, err := flamingo.CrackPorts(params.HTTPPorts)
if err != nil {
log.Fatalf("failed to process ldap ports %s: %s", params.HTTPPorts, err)
}
for _, port := range httpPorts {
port := port
httpConf := flamingo.NewConfHTTP()
httpConf.BindPort = uint16(port)
httpConf.RecordWriter = rw
httpConf.BasicRealm = params.HTTPBasicRealm
httpConf.AuthMode = params.HTTPAuthMode
if err := flamingo.SpawnHTTP(httpConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start ldaps server %s:%d: %q", httpConf.BindHost, httpConf.BindPort, err)
} else {
log.Errorf("failed to start ldaps server %s:%d: %q", httpConf.BindHost, httpConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { httpConf.Shutdown() })
}
}
func setupHTTPS(rw *flamingo.RecordWriter) {
// Create a listener for each port
httpsPorts, err := flamingo.CrackPorts(params.HTTPSPorts)
if err != nil {
log.Fatalf("failed to process ldap ports %s: %s", params.HTTPSPorts, err)
}
for _, port := range httpsPorts {
port := port
httpConf := flamingo.NewConfHTTP()
httpConf.BindPort = uint16(port)
httpConf.RecordWriter = rw
httpConf.BasicRealm = params.HTTPBasicRealm
httpConf.TLS = true
httpConf.TLSCert = params.TLSCertData
httpConf.TLSKey = params.TLSKeyData
httpConf.TLSName = params.TLSName
httpConf.AuthMode = params.HTTPAuthMode
if err := flamingo.SpawnHTTP(httpConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start ldaps server %s:%d: %q", httpConf.BindHost, httpConf.BindPort, err)
} else {
log.Errorf("failed to start ldaps server %s:%d: %q", httpConf.BindHost, httpConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { httpConf.Shutdown() })
}
}
func setupDNS(rw *flamingo.RecordWriter) {
// Create a listener for each port
dnsPorts, err := flamingo.CrackPorts(params.DNSPorts)
if err != nil {
log.Fatal("failed to process dns ports %s: %s", params.DNSPorts, err)
}
for _, port := range dnsPorts {
dnsConf := flamingo.NewConfDNS()
dnsConf.BindPort = uint16(port)
dnsConf.RecordWriter = rw
dnsConf.ResolveToIP = params.DNSResolveToIP
if err := flamingo.SpawnDNS(dnsConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start dns server %s:%d: %q", dnsConf.BindHost, dnsConf.BindPort, err)
} else {
log.Errorf("failed to start dns server %s:%d: %q", dnsConf.BindHost, dnsConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { dnsConf.Shutdown() })
}
}
func setupFTP(rw *flamingo.RecordWriter) {
// Create a listner for each port
ftpPorts, err := flamingo.CrackPorts(params.FTPPorts)
if err != nil {
log.Fatal("failed to process ftp ports %s: %s", params.FTPPorts, err)
}
for _, port := range ftpPorts {
ftpConf := flamingo.NewConfFTP()
ftpConf.BindPort = uint16(port)
ftpConf.RecordWriter = rw
if err := flamingo.SpawnFTP(ftpConf); err != nil {
if params.DontIgnoreFailures {
log.Fatalf("failed to start dns server %s:%d: %q", ftpConf.BindHost, ftpConf.BindPort, err)
} else {
log.Errorf("failed to start dns server %s:%d: %q", ftpConf.BindHost, ftpConf.BindPort, err)
}
continue
}
protocolCount++
cleanupHandlers = append(cleanupHandlers, func() { ftpConf.Shutdown() })
}
}
func sendWebhook(url string, msg string) error {
body, _ := json.Marshal(map[string]string{"text": msg})
req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(body))
if err != nil {
return err
}
req.Header.Set("User-Agent", fmt.Sprintf("flamingo/%s", Version))
req.Header.Set("Content-Type", "application/json")
client := &http.Client{Timeout: time.Second * time.Duration(15)}
resp, err := client.Do(req)
if err != nil {
return err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return fmt.Errorf("bad response: %d", resp.StatusCode)
}
return nil
}