425 lines
12 KiB
Go
425 lines
12 KiB
Go
package csplugin
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
"sync"
|
|
"text/template"
|
|
"time"
|
|
|
|
"github.com/Masterminds/sprig/v3"
|
|
"github.com/google/uuid"
|
|
plugin "github.com/hashicorp/go-plugin"
|
|
"github.com/pkg/errors"
|
|
log "github.com/sirupsen/logrus"
|
|
"gopkg.in/tomb.v2"
|
|
"gopkg.in/yaml.v2"
|
|
|
|
"github.com/crowdsecurity/crowdsec/pkg/csconfig"
|
|
"github.com/crowdsecurity/crowdsec/pkg/csstring"
|
|
"github.com/crowdsecurity/crowdsec/pkg/models"
|
|
"github.com/crowdsecurity/crowdsec/pkg/protobufs"
|
|
"github.com/crowdsecurity/crowdsec/pkg/types"
|
|
)
|
|
|
|
var pluginMutex sync.Mutex
|
|
|
|
const (
|
|
PluginProtocolVersion uint = 1
|
|
CrowdsecPluginKey string = "CROWDSEC_PLUGIN_KEY"
|
|
)
|
|
|
|
// The broker is responsible for running the plugins and dispatching events
|
|
// It receives all the events from the main process and stacks them up
|
|
// It is as well notified by the watcher when it needs to deliver events to plugins (based on time or count threshold)
|
|
type PluginBroker struct {
|
|
PluginChannel chan ProfileAlert
|
|
alertsByPluginName map[string][]*models.Alert
|
|
profileConfigs []*csconfig.ProfileCfg
|
|
pluginConfigByName map[string]PluginConfig
|
|
pluginMap map[string]plugin.Plugin
|
|
notificationConfigsByPluginType map[string][][]byte // "slack" -> []{config1, config2}
|
|
notificationPluginByName map[string]Notifier
|
|
watcher PluginWatcher
|
|
pluginKillMethods []func()
|
|
pluginProcConfig *csconfig.PluginCfg
|
|
pluginsTypesToDispatch map[string]struct{}
|
|
}
|
|
|
|
// holder to determine where to dispatch config and how to format messages
|
|
type PluginConfig struct {
|
|
Type string `yaml:"type"`
|
|
Name string `yaml:"name"`
|
|
GroupWait time.Duration `yaml:"group_wait,omitempty"`
|
|
GroupThreshold int `yaml:"group_threshold,omitempty"`
|
|
MaxRetry int `yaml:"max_retry,omitempty"`
|
|
TimeOut time.Duration `yaml:"timeout,omitempty"`
|
|
|
|
Format string `yaml:"format,omitempty"` // specific to notification plugins
|
|
|
|
Config map[string]interface{} `yaml:",inline"` //to keep the plugin-specific config
|
|
|
|
}
|
|
|
|
type ProfileAlert struct {
|
|
ProfileID uint
|
|
Alert *models.Alert
|
|
}
|
|
|
|
func (pb *PluginBroker) Init(pluginCfg *csconfig.PluginCfg, profileConfigs []*csconfig.ProfileCfg, configPaths *csconfig.ConfigurationPaths) error {
|
|
pb.PluginChannel = make(chan ProfileAlert)
|
|
pb.notificationConfigsByPluginType = make(map[string][][]byte)
|
|
pb.notificationPluginByName = make(map[string]Notifier)
|
|
pb.pluginMap = make(map[string]plugin.Plugin)
|
|
pb.pluginConfigByName = make(map[string]PluginConfig)
|
|
pb.alertsByPluginName = make(map[string][]*models.Alert)
|
|
pb.profileConfigs = profileConfigs
|
|
pb.pluginProcConfig = pluginCfg
|
|
pb.pluginsTypesToDispatch = make(map[string]struct{})
|
|
if err := pb.loadConfig(configPaths.NotificationDir); err != nil {
|
|
return errors.Wrap(err, "while loading plugin config")
|
|
}
|
|
if err := pb.loadPlugins(configPaths.PluginDir); err != nil {
|
|
return errors.Wrap(err, "while loading plugin")
|
|
}
|
|
pb.watcher = PluginWatcher{}
|
|
pb.watcher.Init(pb.pluginConfigByName, pb.alertsByPluginName)
|
|
return nil
|
|
|
|
}
|
|
|
|
func (pb *PluginBroker) Kill() {
|
|
for _, kill := range pb.pluginKillMethods {
|
|
kill()
|
|
}
|
|
}
|
|
|
|
func (pb *PluginBroker) Run(pluginTomb *tomb.Tomb) {
|
|
//we get signaled via the channel when notifications need to be delivered to plugin (via the watcher)
|
|
pb.watcher.Start(&tomb.Tomb{})
|
|
loop:
|
|
for {
|
|
select {
|
|
case profileAlert := <-pb.PluginChannel:
|
|
pb.addProfileAlert(profileAlert)
|
|
|
|
case pluginName := <-pb.watcher.PluginEvents:
|
|
// this can be ran in goroutine, but then locks will be needed
|
|
pluginMutex.Lock()
|
|
log.Tracef("going to deliver %d alerts to plugin %s", len(pb.alertsByPluginName[pluginName]), pluginName)
|
|
tmpAlerts := pb.alertsByPluginName[pluginName]
|
|
pb.alertsByPluginName[pluginName] = make([]*models.Alert, 0)
|
|
pluginMutex.Unlock()
|
|
go func() {
|
|
if err := pb.pushNotificationsToPlugin(pluginName, tmpAlerts); err != nil {
|
|
log.WithField("plugin:", pluginName).Error(err)
|
|
}
|
|
}()
|
|
|
|
case <-pluginTomb.Dying():
|
|
log.Infof("pluginTomb dying")
|
|
pb.watcher.tomb.Kill(errors.New("Terminating"))
|
|
for {
|
|
select {
|
|
case <-pb.watcher.tomb.Dead():
|
|
log.Info("killing all plugins")
|
|
pb.Kill()
|
|
break loop
|
|
case pluginName := <-pb.watcher.PluginEvents:
|
|
// this can be ran in goroutine, but then locks will be needed
|
|
pluginMutex.Lock()
|
|
log.Tracef("going to deliver %d alerts to plugin %s", len(pb.alertsByPluginName[pluginName]), pluginName)
|
|
tmpAlerts := pb.alertsByPluginName[pluginName]
|
|
pb.alertsByPluginName[pluginName] = make([]*models.Alert, 0)
|
|
pluginMutex.Unlock()
|
|
|
|
if err := pb.pushNotificationsToPlugin(pluginName, tmpAlerts); err != nil {
|
|
log.WithField("plugin:", pluginName).Error(err)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pb *PluginBroker) addProfileAlert(profileAlert ProfileAlert) {
|
|
for _, pluginName := range pb.profileConfigs[profileAlert.ProfileID].Notifications {
|
|
if _, ok := pb.pluginConfigByName[pluginName]; !ok {
|
|
log.Errorf("plugin %s is not configured properly.", pluginName)
|
|
continue
|
|
}
|
|
pluginMutex.Lock()
|
|
pb.alertsByPluginName[pluginName] = append(pb.alertsByPluginName[pluginName], profileAlert.Alert)
|
|
pluginMutex.Unlock()
|
|
pb.watcher.Inserts <- pluginName
|
|
}
|
|
}
|
|
func (pb *PluginBroker) profilesContainPlugin(pluginName string) bool {
|
|
for _, profileCfg := range pb.profileConfigs {
|
|
for _, name := range profileCfg.Notifications {
|
|
if pluginName == name {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
func (pb *PluginBroker) loadConfig(path string) error {
|
|
files, err := listFilesAtPath(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, configFilePath := range files {
|
|
if !strings.HasSuffix(configFilePath, ".yaml") && !strings.HasSuffix(configFilePath, ".yml") {
|
|
continue
|
|
}
|
|
|
|
pluginConfigs, err := ParsePluginConfigFile(configFilePath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, pluginConfig := range pluginConfigs {
|
|
if !pb.profilesContainPlugin(pluginConfig.Name) {
|
|
continue
|
|
}
|
|
setRequiredFields(&pluginConfig)
|
|
if _, ok := pb.pluginConfigByName[pluginConfig.Name]; ok {
|
|
log.Warnf("several configs for notification %s found ", pluginConfig.Name)
|
|
}
|
|
pb.pluginConfigByName[pluginConfig.Name] = pluginConfig
|
|
}
|
|
}
|
|
err = pb.verifyPluginConfigsWithProfile()
|
|
return err
|
|
}
|
|
|
|
// checks whether every notification in profile has it's own config file
|
|
func (pb *PluginBroker) verifyPluginConfigsWithProfile() error {
|
|
for _, profileCfg := range pb.profileConfigs {
|
|
for _, pluginName := range profileCfg.Notifications {
|
|
if _, ok := pb.pluginConfigByName[pluginName]; !ok {
|
|
return fmt.Errorf("config file for plugin %s not found", pluginName)
|
|
}
|
|
pb.pluginsTypesToDispatch[pb.pluginConfigByName[pluginName].Type] = struct{}{}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// check whether each plugin in profile has it's own binary
|
|
func (pb *PluginBroker) verifyPluginBinaryWithProfile() error {
|
|
for _, profileCfg := range pb.profileConfigs {
|
|
for _, pluginName := range profileCfg.Notifications {
|
|
if _, ok := pb.notificationPluginByName[pluginName]; !ok {
|
|
return fmt.Errorf("binary for plugin %s not found", pluginName)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (pb *PluginBroker) loadPlugins(path string) error {
|
|
binaryPaths, err := listFilesAtPath(path)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, binaryPath := range binaryPaths {
|
|
if err := pluginIsValid(binaryPath); err != nil {
|
|
return err
|
|
}
|
|
pType, pSubtype, err := getPluginTypeAndSubtypeFromPath(binaryPath) // eg pType="notification" , pSubtype="slack"
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if pType != "notification" {
|
|
continue
|
|
}
|
|
|
|
if _, ok := pb.pluginsTypesToDispatch[pSubtype]; !ok {
|
|
continue
|
|
}
|
|
|
|
pluginClient, err := pb.loadNotificationPlugin(pSubtype, binaryPath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, pc := range pb.pluginConfigByName {
|
|
if pc.Type != pSubtype {
|
|
continue
|
|
}
|
|
|
|
data, err := yaml.Marshal(pc)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
data = []byte(csstring.StrictExpand(string(data), os.LookupEnv))
|
|
_, err = pluginClient.Configure(context.Background(), &protobufs.Config{Config: data})
|
|
if err != nil {
|
|
return errors.Wrapf(err, "while configuring %s", pc.Name)
|
|
}
|
|
log.Infof("registered plugin %s", pc.Name)
|
|
pb.notificationPluginByName[pc.Name] = pluginClient
|
|
}
|
|
}
|
|
return pb.verifyPluginBinaryWithProfile()
|
|
}
|
|
|
|
func (pb *PluginBroker) loadNotificationPlugin(name string, binaryPath string) (Notifier, error) {
|
|
|
|
handshake, err := getHandshake()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
log.Debugf("Executing plugin %s", binaryPath)
|
|
cmd, err := pb.CreateCmd(binaryPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pb.pluginMap[name] = &NotifierPlugin{}
|
|
l := log.New()
|
|
err = types.ConfigureLogger(l)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// We set the highest level to permit plugins to set their own log level
|
|
// without that, crowdsec log level is controlling plugins level
|
|
l.SetLevel(log.TraceLevel)
|
|
logger := NewHCLogAdapter(l, "")
|
|
c := plugin.NewClient(&plugin.ClientConfig{
|
|
HandshakeConfig: handshake,
|
|
Plugins: pb.pluginMap,
|
|
Cmd: cmd,
|
|
AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
|
|
Logger: logger,
|
|
})
|
|
client, err := c.Client()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
raw, err := client.Dispense(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
pb.pluginKillMethods = append(pb.pluginKillMethods, c.Kill)
|
|
return raw.(Notifier), nil
|
|
}
|
|
|
|
func (pb *PluginBroker) pushNotificationsToPlugin(pluginName string, alerts []*models.Alert) error {
|
|
log.WithField("plugin", pluginName).Debugf("pushing %d alerts to plugin", len(alerts))
|
|
if len(alerts) == 0 {
|
|
return nil
|
|
}
|
|
|
|
message, err := formatAlerts(pb.pluginConfigByName[pluginName].Format, alerts)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
plugin := pb.notificationPluginByName[pluginName]
|
|
backoffDuration := time.Second
|
|
for i := 1; i <= pb.pluginConfigByName[pluginName].MaxRetry; i++ {
|
|
ctx, cancel := context.WithTimeout(context.Background(), pb.pluginConfigByName[pluginName].TimeOut)
|
|
defer cancel()
|
|
_, err = plugin.Notify(
|
|
ctx,
|
|
&protobufs.Notification{
|
|
Text: message,
|
|
Name: pluginName,
|
|
},
|
|
)
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
log.WithField("plugin", pluginName).Errorf("%s error, retry num %d", err, i)
|
|
time.Sleep(backoffDuration)
|
|
backoffDuration *= 2
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func ParsePluginConfigFile(path string) ([]PluginConfig, error) {
|
|
parsedConfigs := make([]PluginConfig, 0)
|
|
yamlFile, err := os.Open(path)
|
|
if err != nil {
|
|
return parsedConfigs, errors.Wrapf(err, "while opening %s", path)
|
|
}
|
|
dec := yaml.NewDecoder(yamlFile)
|
|
dec.SetStrict(true)
|
|
for {
|
|
pc := PluginConfig{}
|
|
err = dec.Decode(&pc)
|
|
if err != nil {
|
|
if errors.Is(err, io.EOF) {
|
|
break
|
|
}
|
|
return []PluginConfig{}, fmt.Errorf("while decoding %s got error %s", path, err)
|
|
}
|
|
parsedConfigs = append(parsedConfigs, pc)
|
|
}
|
|
return parsedConfigs, nil
|
|
}
|
|
|
|
func setRequiredFields(pluginCfg *PluginConfig) {
|
|
if pluginCfg.MaxRetry == 0 {
|
|
pluginCfg.MaxRetry++
|
|
}
|
|
|
|
if pluginCfg.TimeOut == time.Second*0 {
|
|
pluginCfg.TimeOut = time.Second * 5
|
|
}
|
|
|
|
}
|
|
|
|
// helper which gives paths to all files in the given directory non-recursively
|
|
func listFilesAtPath(path string) ([]string, error) {
|
|
filePaths := make([]string, 0)
|
|
files, err := os.ReadDir(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, file := range files {
|
|
if file.IsDir() {
|
|
continue
|
|
}
|
|
filePaths = append(filePaths, filepath.Join(path, file.Name()))
|
|
}
|
|
return filePaths, nil
|
|
}
|
|
|
|
func getUUID() (string, error) {
|
|
uuidv4, err := uuid.NewRandom()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return uuidv4.String(), nil
|
|
}
|
|
|
|
func getHandshake() (plugin.HandshakeConfig, error) {
|
|
uuid, err := getUUID()
|
|
if err != nil {
|
|
return plugin.HandshakeConfig{}, err
|
|
}
|
|
handshake := plugin.HandshakeConfig{
|
|
ProtocolVersion: PluginProtocolVersion,
|
|
MagicCookieKey: CrowdsecPluginKey,
|
|
MagicCookieValue: uuid,
|
|
}
|
|
return handshake, nil
|
|
}
|
|
|
|
func formatAlerts(format string, alerts []*models.Alert) (string, error) {
|
|
template, err := template.New("").Funcs(sprig.TxtFuncMap()).Funcs(funcMap()).Parse(format)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
b := new(strings.Builder)
|
|
err = template.Execute(b, alerts)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return b.String(), nil
|
|
}
|