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output.go
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output.go
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package common
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"net/http"
"reflect"
"strings"
"syscall"
"time"
syslog "github.com/RackSec/srslog"
log "github.com/sirupsen/logrus"
"github.com/zhyocean/neuvector/controller/api"
"github.com/zhyocean/neuvector/share"
"github.com/zhyocean/neuvector/share/utils"
)
const syslogFacility = syslog.LOG_LOCAL0
const notificationHeader = "notification"
type Syslogger struct {
writer *syslog.Writer
proto string
addr string
catSet utils.Set
prio syslog.Priority
inJSON bool
}
func NewSyslogger(cfg *share.CLUSSyslogConfig) *Syslogger {
var server, proto string
if cfg.SyslogIP != nil {
server = cfg.SyslogIP.String()
} else {
server = cfg.SyslogServer
}
if cfg.SyslogIPProto == syscall.IPPROTO_TCP {
proto = "tcp"
} else {
proto = "udp"
}
prio, _ := LevelToPrio(cfg.SyslogLevel)
catSet := utils.NewSet()
for _, cat := range cfg.SyslogCategories {
if cat == api.CategoryRuntime {
catSet.Add(api.CategoryViolation)
catSet.Add(api.CategoryThreat)
catSet.Add(api.CategoryIncident)
} else {
catSet.Add(cat)
}
}
return &Syslogger{
proto: proto,
addr: fmt.Sprintf("%s:%d", server, cfg.SyslogPort),
catSet: catSet,
prio: prio,
inJSON: cfg.SyslogInJSON,
}
}
func (s *Syslogger) Close() {
if s.writer != nil {
s.writer.Close()
}
}
func (s *Syslogger) Send(elog interface{}, level, cat, header string) error {
if !s.catSet.Contains(cat) {
return nil
}
prio, ok := LevelToPrio(level)
if !ok || prio > s.prio {
return nil
}
if s.inJSON {
if data, _ := json.Marshal(elog); len(data) > 2 {
logText := fmt.Sprintf("{\"%s\": \"%s\", %s", notificationHeader, header, string(data[1:][:]))
return s.send(logText, prio)
}
} else {
if logText := struct2Text(elog); logText != "" {
logText = fmt.Sprintf("%s=%s,%s", notificationHeader, header, logText)
return s.send(logText, prio)
}
}
return nil
}
func appendLogField(logText string, tag string, v reflect.Value) string {
tokens := strings.Split(tag, ",")
if len(tokens) > 1 && tokens[1] == "omitempty" {
// Assume simple value, otherwise use deepequal()
if v.Kind() == reflect.Slice {
if v.Len() == 0 {
return logText
}
} else if v.Kind() == reflect.Map {
if v.Len() == 0 {
return logText
}
} else {
if isEmptyValue(v) {
return logText
}
}
}
if logText == "" {
return fmt.Sprintf("%s=%v", tokens[0], v)
} else {
return fmt.Sprintf("%s,%s=%v", logText, tokens[0], v)
}
}
func struct2Text(elog interface{}) string {
var logText string
// check log pointer or struct
v := reflect.ValueOf(elog).Elem()
// get all the key and value
for i := 0; i < v.NumField(); i++ {
t := v.Type().Field(i)
f := v.Field(i)
if f.Kind() == reflect.Struct && t.Anonymous {
for j := 0; j < f.NumField(); j++ {
emt := f.Type().Field(j)
emf := f.Field(j)
if tag := emt.Tag.Get("json"); tag != "" {
logText = appendLogField(logText, tag, emf)
}
}
} else {
if tag := t.Tag.Get("json"); tag != "" {
logText = appendLogField(logText, tag, f)
}
}
}
return logText
}
func (s *Syslogger) sendWithLevel(text string, prio syslog.Priority) error {
switch prio {
case syslog.LOG_EMERG:
return s.writer.Emerg(text)
case syslog.LOG_ALERT:
return s.writer.Alert(text)
case syslog.LOG_CRIT:
return s.writer.Crit(text)
case syslog.LOG_ERR:
return s.writer.Err(text)
case syslog.LOG_WARNING:
return s.writer.Warning(text)
case syslog.LOG_NOTICE:
return s.writer.Notice(text)
case syslog.LOG_INFO:
return s.writer.Info(text)
case syslog.LOG_DEBUG:
return s.writer.Debug(text)
default:
return s.writer.Debug(text)
}
}
func (s *Syslogger) send(text string, prio syslog.Priority) error {
if s.writer != nil {
if err := s.sendWithLevel(text, prio); err == nil {
return nil
}
s.Close()
}
if wr, err := syslog.Dial(s.proto, s.addr, syslogFacility|prio, "neuvector"); err != nil {
return err
} else {
wr.SetFormatter(syslog.RFC5424Formatter)
s.writer = wr
return s.sendWithLevel(text, prio)
}
}
// --
const contentType = "application/json"
const webhookInfo = "Neuvector webhook is configured."
const requestTimeout = time.Duration(5 * time.Second)
type Webhook struct {
url string
client *http.Client
}
func NewWebHook(url string) *Webhook {
w := &Webhook{
url: url,
client: &http.Client{
Timeout: requestTimeout,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
},
},
}
return w
}
func (w *Webhook) Validate() error {
log.WithFields(log.Fields{"url": w.url}).Debug("")
fields := make(map[string]string)
fields["text"] = fmt.Sprintf("%s", webhookInfo)
jsonValue, _ := json.Marshal(fields)
return w.httpRequest(jsonValue)
}
func (w *Webhook) Notify(elog interface{}, target, level, category, cluster, title string) {
log.WithFields(log.Fields{"title": title}).Debug()
if logText := struct2Text(elog); logText != "" {
var data []byte
if target == api.WebhookTypeSlack {
// Prefix category
logText = fmt.Sprintf("%s=%s,%s", notificationHeader, category, logText)
// Prefix category and title with styles
logText = fmt.Sprintf("*%s: %s level*\n_%s_\n>>> %s", strings.Title(category), strings.ToUpper(LevelToString(level)), title, logText)
fields := make(map[string]string)
fields["text"] = logText
fields["username"] = fmt.Sprintf("NeuVector - %s", cluster)
data, _ = json.Marshal(fields)
} else if target == api.WebhookTypeJSON {
extra := fmt.Sprintf("{\"level\":\"%s\",\"cluster\":\"%s\",", strings.ToUpper(LevelToString(level)), cluster)
data, _ = json.Marshal(elog)
data = append([]byte(extra), data[1:]...)
} else {
msg := fmt.Sprintf("level=%s,cluster=%s,%s", strings.ToUpper(LevelToString(level)), cluster, logText)
data = []byte(msg)
}
w.httpRequest(data)
}
}
func (w *Webhook) httpRequest(data []byte) error {
var err error
var resp *http.Response
retry := 0
for retry < 3 {
resp, err = w.client.Post(w.url, contentType, bytes.NewBuffer(data))
if err != nil {
log.WithFields(log.Fields{"error": err}).Error("Webhook Send HTTP fail")
return err
} else {
resp.Body.Close()
if resp.StatusCode == http.StatusOK {
return nil
} else {
err = fmt.Errorf("HTTP response: %s", resp.Status)
if resp.StatusCode != http.StatusInternalServerError {
log.WithFields(log.Fields{"error": err}).Error("Webhook server response error")
return err
}
}
}
retry++
}
log.WithFields(log.Fields{"error": err}).Error("Webhook server internal error")
return err
}