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scan-service.go
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scan-service.go
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package tlsaudit
import (
"bufio"
"fmt"
"io/ioutil"
"math/rand"
"net"
"os"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"time"
"github.com/adedayo/cidr"
tlsmodel "github.com/adedayo/tlsaudit/pkg/model"
"github.com/carlescere/scheduler"
log "github.com/sirupsen/logrus"
yaml "gopkg.in/yaml.v2"
)
var (
//TLSAuditConfigPath is the default config path of the TLSAudit service
TLSAuditConfigPath = filepath.Join("data", "config", "TLSAuditConfig.yml")
latestTLSAuditSnapshot = make(map[time.Time]tlsmodel.TLSAuditSnapshotHuman)
// tempTable = []byte("tempTable")
//control files
runFlag = filepath.Join("data", "tlsaudit", "runlock.txt")
runFlag2 = filepath.Join("data", "tlsaudit", "deletethistoresume.txt")
workList = filepath.Join("data", "tlsaudit", "worklist.txt")
progress = filepath.Join("data", "tlsaudit", "progress.txt")
resolvedIPs = make(map[string]string)
ipLock = sync.RWMutex{}
)
//Service main service entry function
func Service(configPath string) {
println("Running TLSAudit Service ...")
TLSAuditConfigPath = configPath
ScheduleTLSAudit(getIPsFromConfig, ipResolver)
runtime.Goexit()
}
func resolveIPs(ips []string) {
for _, ip := range ips {
ipLock.Lock()
if _, present := resolvedIPs[ip]; !present {
if hosts, err := net.LookupAddr(ip); err == nil && len(hosts) > 0 {
resolvedIPs[ip] = hosts[0]
ips = append(ips, ip)
} else {
resolvedIPs[ip] = ""
}
}
ipLock.Unlock()
}
}
func ipResolver(ip string) string {
defer ipLock.Unlock()
ipLock.Lock()
if hostname, present := resolvedIPs[ip]; present {
return hostname
}
return ""
}
func getIPsFromConfig() []string {
config, err := loadTLSConfig(TLSAuditConfigPath)
if err != nil {
return []string{}
}
ips := getIPsToScan(config)
return ips
}
func getIPsToScan(config tlsmodel.TLSAuditConfig) []string {
data := make(map[string]string)
ips := []string{}
for _, c := range config.CIDRRanges {
ports := ""
if strings.Contains(c, ":") {
cc, p, err := extractPorts(c)
if err != nil {
continue
}
c = cc
ports = p
}
for _, ip := range cidr.Expand(c) {
ip = fmt.Sprintf("%s/32", ip)
if ps, present := data[ip]; present {
if ps == "" {
data[ip] = ports
} else if ports != "" {
data[ip] = fmt.Sprintf("%s,%s", ps, ports)
}
} else {
data[ip] = ports
}
}
}
for ip, ports := range data {
x := ip
if ports != "" {
z := strings.Split(ip, "/")
if len(z) != 2 {
continue
}
x = fmt.Sprintf("%s:%s/%s", z[0], ports, z[1])
println(x)
}
ips = append(ips, x)
}
return ips
}
func extractPorts(cidrX string) (string, string, error) {
cs := strings.Split(cidrX, ":")
if len(cs) != 2 {
return cidrX, "", fmt.Errorf("Bad CIDR with port format %s", cidrX)
}
ip := cs[0]
if !strings.Contains(cs[1], "/") {
return ip + "/32", cs[1], nil
}
rng := strings.Split(cs[1], "/")
if len(rng) != 2 {
return cidrX, "", fmt.Errorf("Bad CIDR with port format %s", cidrX)
}
return fmt.Sprintf("%s/%s", ip, rng[1]), rng[0], nil
}
//ScheduleTLSAudit runs TLSAudit scan
func ScheduleTLSAudit(ipSource func() []string, resolver func(string) string) {
//a restart schould clear the lock file
if _, err := os.Stat(runFlag2); !os.IsNotExist(err) { // there is a runlock
if err := os.Remove(runFlag2); err != nil {
println(err.Error())
log.Error(err)
}
}
scanJob := func() {
runTLSScan(ipSource, resolver)
}
if config, err := loadTLSConfig(TLSAuditConfigPath); err == nil {
for _, t := range config.DailySchedules {
if config.IsProduction {
println("Running next at ", t)
scheduler.Every().Day().At(t).Run(scanJob)
} else {
scheduler.Every(2).Hours().Run(scanJob)
}
}
}
if _, err := os.Stat(workList); !os.IsNotExist(err) {
runTLSScan(ipSource, resolver)
}
}
//RunTLSScan accepts generator of IP addresses to scan and a function to map the IPs to hostnames (if any) - function to allow the hostname resolution happen in parallel if necessary
func runTLSScan(ipSource func() []string, ipToHostnameResolver func(string) string) {
//create a directory, if not exist, for tlsaudit to keep temporary file
path := filepath.Join("data", "tlsaudit", "scan")
if _, err := os.Stat(path); os.IsNotExist(err) {
if err2 := os.MkdirAll(path, 0755); err2 != nil {
log.Errorln("Could not create the path ", path)
}
}
//prevent concurrent runs
if _, err := os.Stat(runFlag2); !os.IsNotExist(err) { // there is a runlock
//do not start a new scan
return
}
psr := tlsmodel.PersistedScanRequest{}
hosts := []string{}
// ipHostNameMapping := ipToHostnameResolver
if _, err := os.Stat(workList); !os.IsNotExist(err) { // there is a worklist (due to a previous crash!)
//load the list of IPs from there
println("Resuming due to a worklist")
file, err := os.Open(workList)
if err != nil {
log.Error(err)
return
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
hosts = append(hosts, scanner.Text())
}
day, err := ioutil.ReadFile(runFlag)
if err != nil {
log.Error(err)
return
}
d := strings.TrimSpace(string(day))
println("Resuming on date ", d, filepath.Join(path, d))
dirs, err := ioutil.ReadDir(filepath.Join(path, d))
if err != nil {
println(err.Error())
log.Error(err)
return
}
fmt.Printf("%#v\n", dirs)
for _, sID := range dirs {
scanID := sID.Name()
println(scanID)
if p, err := LoadScanRequest(d, scanID); err == nil {
psr = p
break
}
}
fmt.Printf("Will be scanning with PSR %#v", psr)
} else { // starting a fresh scan
hosts = ipSource()
//shuffle hosts randomly
rand.Shuffle(len(hosts), func(i, j int) {
hosts[i], hosts[j] = hosts[j], hosts[i]
})
//write shuffled hosts into worklist file
if err := ioutil.WriteFile(workList, []byte(strings.Join(hosts, "\n")+"\n"), 0644); err != nil {
log.Error(err)
return
}
//track progress in the progress file
if err := ioutil.WriteFile(progress, []byte(fmt.Sprintf("-1,%d", len(hosts))), 0644); err != nil {
log.Error(err)
return
}
//create the lock file with the start day
today := time.Now().Format(dayFormat)
if err := ioutil.WriteFile(runFlag, []byte(today), 0644); err != nil {
log.Error(err)
return
}
if err := ioutil.WriteFile(runFlag2, []byte{}, 0644); err != nil {
log.Error(err)
return
}
psr.Hosts = hosts
request := tlsmodel.ScanRequest{}
request.Day = today
request.ScanID = GetNextScanID()
config, _ := loadTLSConfig(TLSAuditConfigPath)
scanConfig := tlsmodel.ScanConfig{
PacketsPerSecond: config.PacketsPerSecond,
Timeout: config.Timeout,
}
request.Config = scanConfig
psr.Request = request
}
go resolveIPs(hosts)
//get ready to scan
//get where we "stopped" last time possibly after a crash
stopped := 0
p, err := ioutil.ReadFile(progress)
if err != nil {
log.Error(err)
return
}
stopped, err = strconv.Atoi(strings.Split(string(p), ",")[0])
if err != nil {
log.Error(err)
return
}
psr.Progress = stopped
PersistScanRequest(psr)
count := len(hosts)
println(strings.Join(hosts, "\n"))
//scan hosts
for index, host := range hosts {
//skip already scanned hosts, if any
if index <= stopped {
fmt.Printf("Skipping host %s\n", host)
continue
}
counter := index + 1
scan := make(map[string]tlsmodel.ScanResult)
results := []<-chan tlsmodel.ScanResult{}
scanResults := []tlsmodel.ScanResult{}
fmt.Printf("Scanning Host %s (%d of %d)\n", host, counter, count)
results = append(results, ScanCIDRTLS(host, psr.Request.Config))
for result := range MergeResultChannels(results...) {
key := result.Server + result.Port
if _, present := scan[key]; !present {
scan[key] = result
scanResults = append(scanResults, result)
println("Got result for ", result.Server, ipToHostnameResolver(result.Server), result.Port, result.SupportsTLS(), result.IsSTARTLS, fmt.Sprintf("%#v", result.SupportedProtocols))
}
}
sort.Sort(tlsmodel.ScanResultSorter(scanResults))
PersistScans(psr, host, scanResults)
if err := ioutil.WriteFile(progress, []byte(fmt.Sprintf("%d,%d", counter, len(hosts))), 0644); err != nil {
log.Error(err)
return
}
psr.Progress = counter
PersistScanRequest(psr)
}
//cleanup
if err := os.Remove(runFlag); err != nil {
log.Error(err)
}
if err := os.Remove(runFlag2); err != nil {
log.Error(err)
}
if err := os.Remove(progress); err != nil {
log.Error(err)
}
if err := os.Remove(workList); err != nil {
log.Error(err)
}
}
func loadTLSConfig(path string) (config tlsmodel.TLSAuditConfig, e error) {
configFile, err := ioutil.ReadFile(path)
if err != nil {
log.Error(err)
return config, err
}
err = yaml.Unmarshal(configFile, &config)
if err != nil {
log.Error(err)
return config, err
}
return
}
type sorter []tlsmodel.ScanResult
func (k sorter) Len() int {
return len(k)
}
func (k sorter) Swap(i, j int) {
k[i], k[j] = k[j], k[i]
}
func (k sorter) Less(i, j int) bool {
iPort, _ := strconv.Atoi(k[i].Port)
jPort, _ := strconv.Atoi(k[j].Port)
return k[i].Server < k[j].Server || (k[i].Server == k[j].Server && iPort <= jPort)
}