crowdsec/pkg/apiserver/apic.go

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package apiserver
import (
"context"
"fmt"
"math/rand"
"net/url"
"strconv"
"strings"
"sync"
"time"
"github.com/go-openapi/strfmt"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
"gopkg.in/tomb.v2"
"github.com/crowdsecurity/crowdsec/pkg/apiclient"
"github.com/crowdsecurity/crowdsec/pkg/csconfig"
"github.com/crowdsecurity/crowdsec/pkg/cwversion"
"github.com/crowdsecurity/crowdsec/pkg/database"
"github.com/crowdsecurity/crowdsec/pkg/database/ent/alert"
"github.com/crowdsecurity/crowdsec/pkg/database/ent/decision"
"github.com/crowdsecurity/crowdsec/pkg/models"
"github.com/crowdsecurity/crowdsec/pkg/types"
)
var (
pullIntervalDefault = time.Hour * 2
pullIntervalDelta = 5 * time.Minute
pushIntervalDefault = time.Second * 30
pushIntervalDelta = time.Second * 15
metricsIntervalDefault = time.Minute * 30
metricsIntervalDelta = time.Minute * 15
)
var SCOPE_CAPI string = "CAPI"
var SCOPE_CAPI_ALIAS string = "crowdsecurity/community-blocklist" //we don't use "CAPI" directly, to make it less confusing for the user
var SCOPE_LISTS string = "lists"
type apic struct {
// when changing the intervals in tests, always set *First too
// or they can be negative
pullInterval time.Duration
pullIntervalFirst time.Duration
pushInterval time.Duration
pushIntervalFirst time.Duration
metricsInterval time.Duration
metricsIntervalFirst time.Duration
dbClient *database.Client
apiClient *apiclient.ApiClient
alertToPush chan []*models.Alert
mu sync.Mutex
pushTomb tomb.Tomb
pullTomb tomb.Tomb
metricsTomb tomb.Tomb
startup bool
credentials *csconfig.ApiCredentialsCfg
scenarioList []string
consoleConfig *csconfig.ConsoleConfig
}
// randomDuration returns a duration value between d-delta and d+delta
func randomDuration(d time.Duration, delta time.Duration) time.Duration {
return time.Duration(float64(d) + float64(delta)*(-1.0+2.0*rand.Float64()))
}
func (a *apic) FetchScenariosListFromDB() ([]string, error) {
scenarios := make([]string, 0)
machines, err := a.dbClient.ListMachines()
if err != nil {
return nil, errors.Wrap(err, "while listing machines")
}
//merge all scenarios together
for _, v := range machines {
machineScenarios := strings.Split(v.Scenarios, ",")
log.Debugf("%d scenarios for machine %d", len(machineScenarios), v.ID)
for _, sv := range machineScenarios {
if !types.InSlice(sv, scenarios) && sv != "" {
scenarios = append(scenarios, sv)
}
}
}
log.Debugf("Returning list of scenarios : %+v", scenarios)
return scenarios, nil
}
func alertToSignal(alert *models.Alert, scenarioTrust string) *models.AddSignalsRequestItem {
return &models.AddSignalsRequestItem{
Message: alert.Message,
Scenario: alert.Scenario,
ScenarioHash: alert.ScenarioHash,
ScenarioVersion: alert.ScenarioVersion,
Source: alert.Source,
StartAt: alert.StartAt,
StopAt: alert.StopAt,
CreatedAt: alert.CreatedAt,
MachineID: alert.MachineID,
ScenarioTrust: &scenarioTrust,
}
}
func NewAPIC(config *csconfig.OnlineApiClientCfg, dbClient *database.Client, consoleConfig *csconfig.ConsoleConfig) (*apic, error) {
var err error
ret := &apic{
alertToPush: make(chan []*models.Alert),
dbClient: dbClient,
mu: sync.Mutex{},
startup: true,
credentials: config.Credentials,
pullTomb: tomb.Tomb{},
pushTomb: tomb.Tomb{},
metricsTomb: tomb.Tomb{},
scenarioList: make([]string, 0),
consoleConfig: consoleConfig,
pullInterval: pullIntervalDefault,
pullIntervalFirst: randomDuration(pullIntervalDefault, pullIntervalDelta),
pushInterval: pushIntervalDefault,
pushIntervalFirst: randomDuration(pushIntervalDefault, pushIntervalDelta),
metricsInterval: metricsIntervalDefault,
metricsIntervalFirst: randomDuration(metricsIntervalDefault, metricsIntervalDelta),
}
password := strfmt.Password(config.Credentials.Password)
apiURL, err := url.Parse(config.Credentials.URL)
if err != nil {
return nil, errors.Wrapf(err, "while parsing '%s'", config.Credentials.URL)
}
ret.scenarioList, err = ret.FetchScenariosListFromDB()
if err != nil {
return nil, errors.Wrap(err, "while fetching scenarios from db")
}
ret.apiClient, err = apiclient.NewClient(&apiclient.Config{
MachineID: config.Credentials.Login,
Password: password,
UserAgent: fmt.Sprintf("crowdsec/%s", cwversion.VersionStr()),
URL: apiURL,
VersionPrefix: "v2",
Scenarios: ret.scenarioList,
UpdateScenario: ret.FetchScenariosListFromDB,
})
return ret, err
}
// keep track of all alerts in cache and push it to CAPI every PushInterval.
func (a *apic) Push() error {
defer types.CatchPanic("lapi/pushToAPIC")
var cache models.AddSignalsRequest
ticker := time.NewTicker(a.pushIntervalFirst)
log.Infof("Start push to CrowdSec Central API (interval: %s once, then %s)", a.pushIntervalFirst.Round(time.Second), a.pushInterval)
for {
select {
case <-a.pushTomb.Dying(): // if one apic routine is dying, do we kill the others?
a.pullTomb.Kill(nil)
a.metricsTomb.Kill(nil)
log.Infof("push tomb is dying, sending cache (%d elements) before exiting", len(cache))
if len(cache) == 0 {
return nil
}
go a.Send(&cache)
return nil
case <-ticker.C:
ticker.Reset(a.pushInterval)
if len(cache) > 0 {
a.mu.Lock()
cacheCopy := cache
cache = make(models.AddSignalsRequest, 0)
a.mu.Unlock()
log.Infof("Signal push: %d signals to push", len(cacheCopy))
go a.Send(&cacheCopy)
}
case alerts := <-a.alertToPush:
var signals []*models.AddSignalsRequestItem
for _, alert := range alerts {
if ok := shouldShareAlert(alert, a.consoleConfig); ok {
signals = append(signals, alertToSignal(alert, getScenarioTrustOfAlert(alert)))
}
}
a.mu.Lock()
cache = append(cache, signals...)
a.mu.Unlock()
}
}
}
func getScenarioTrustOfAlert(alert *models.Alert) string {
scenarioTrust := "certified"
if alert.ScenarioHash == nil || *alert.ScenarioHash == "" {
scenarioTrust = "custom"
} else if alert.ScenarioVersion == nil || *alert.ScenarioVersion == "" || *alert.ScenarioVersion == "?" {
scenarioTrust = "tainted"
}
if len(alert.Decisions) > 0 {
if *alert.Decisions[0].Origin == "cscli" {
scenarioTrust = "manual"
}
}
return scenarioTrust
}
func shouldShareAlert(alert *models.Alert, consoleConfig *csconfig.ConsoleConfig) bool {
if *alert.Simulated {
log.Debugf("simulation enabled for alert (id:%d), will not be sent to CAPI", alert.ID)
return false
}
switch scenarioTrust := getScenarioTrustOfAlert(alert); scenarioTrust {
case "manual":
if !*consoleConfig.ShareManualDecisions {
log.Debugf("manual decision generated an alert, doesn't send it to CAPI because options is disabled")
return false
}
case "tainted":
if !*consoleConfig.ShareTaintedScenarios {
log.Debugf("tainted scenario generated an alert, doesn't send it to CAPI because options is disabled")
return false
}
case "custom":
if !*consoleConfig.ShareCustomScenarios {
log.Debugf("custom scenario generated an alert, doesn't send it to CAPI because options is disabled")
return false
}
}
return true
}
func (a *apic) Send(cacheOrig *models.AddSignalsRequest) {
/*we do have a problem with this :
The apic.Push background routine reads from alertToPush chan.
This chan is filled by Controller.CreateAlert
If the chan apic.Send hangs, the alertToPush chan will become full,
with means that Controller.CreateAlert is going to hang, blocking API worker(s).
So instead, we prefer to cancel write.
I don't know enough about gin to tell how much of an issue it can be.
*/
var cache []*models.AddSignalsRequestItem = *cacheOrig
var send models.AddSignalsRequest
bulkSize := 50
pageStart := 0
pageEnd := bulkSize
for {
if pageEnd >= len(cache) {
send = cache[pageStart:]
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_, _, err := a.apiClient.Signal.Add(ctx, &send)
if err != nil {
log.Errorf("Error while sending final chunk to central API : %s", err)
return
}
break
}
send = cache[pageStart:pageEnd]
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
_, _, err := a.apiClient.Signal.Add(ctx, &send)
if err != nil {
//we log it here as well, because the return value of func might be discarded
log.Errorf("Error while sending chunk to central API : %s", err)
}
pageStart += bulkSize
pageEnd += bulkSize
}
}
func (a *apic) CAPIPullIsOld() (bool, error) {
/*only pull community blocklist if it's older than 1h30 */
alerts := a.dbClient.Ent.Alert.Query()
alerts = alerts.Where(alert.HasDecisionsWith(decision.OriginEQ(database.CapiMachineID)))
alerts = alerts.Where(alert.CreatedAtGTE(time.Now().UTC().Add(-time.Duration(1*time.Hour + 30*time.Minute)))) //nolint:unconvert
count, err := alerts.Count(a.dbClient.CTX)
if err != nil {
return false, errors.Wrap(err, "while looking for CAPI alert")
}
if count > 0 {
log.Printf("last CAPI pull is newer than 1h30, skip.")
return false, nil
}
return true, nil
}
func (a *apic) HandleDeletedDecisions(deletedDecisions []*models.Decision, delete_counters map[string]map[string]int) (int, error) {
var filter map[string][]string
var nbDeleted int
for _, decision := range deletedDecisions {
if strings.ToLower(*decision.Scope) == "ip" {
filter = make(map[string][]string, 1)
filter["value"] = []string{*decision.Value}
} else {
filter = make(map[string][]string, 3)
filter["value"] = []string{*decision.Value}
filter["type"] = []string{*decision.Type}
filter["scopes"] = []string{*decision.Scope}
}
filter["origin"] = []string{*decision.Origin}
dbCliRet, err := a.dbClient.SoftDeleteDecisionsWithFilter(filter)
if err != nil {
return 0, errors.Wrap(err, "deleting decisions error")
}
dbCliDel, err := strconv.Atoi(dbCliRet)
if err != nil {
return 0, errors.Wrapf(err, "converting db ret %d", dbCliDel)
}
updateCounterForDecision(delete_counters, decision, dbCliDel)
nbDeleted += dbCliDel
}
return nbDeleted, nil
}
func createAlertsForDecisions(decisions []*models.Decision) []*models.Alert {
newAlerts := make([]*models.Alert, 0)
for _, decision := range decisions {
found := false
for _, sub := range newAlerts {
if sub.Source.Scope == nil {
log.Warningf("nil scope in %+v", sub)
continue
}
if *decision.Origin == SCOPE_CAPI {
if *sub.Source.Scope == SCOPE_CAPI {
found = true
break
}
} else if *decision.Origin == SCOPE_LISTS {
if *sub.Source.Scope == *decision.Origin {
if sub.Scenario == nil {
log.Warningf("nil scenario in %+v", sub)
}
if *sub.Scenario == *decision.Scenario {
found = true
break
}
}
} else {
log.Warningf("unknown origin %s : %+v", *decision.Origin, decision)
}
}
if !found {
log.Debugf("Create entry for origin:%s scenario:%s", *decision.Origin, *decision.Scenario)
newAlerts = append(newAlerts, createAlertForDecision(decision))
}
}
return newAlerts
}
func createAlertForDecision(decision *models.Decision) *models.Alert {
newAlert := &models.Alert{}
newAlert.Source = &models.Source{}
newAlert.Source.Scope = types.StrPtr("")
if *decision.Origin == SCOPE_CAPI { //to make things more user friendly, we replace CAPI with community-blocklist
newAlert.Scenario = types.StrPtr(SCOPE_CAPI)
newAlert.Source.Scope = types.StrPtr(SCOPE_CAPI)
} else if *decision.Origin == SCOPE_LISTS {
newAlert.Scenario = types.StrPtr(*decision.Scenario)
newAlert.Source.Scope = types.StrPtr(SCOPE_LISTS)
} else {
log.Warningf("unknown origin %s", *decision.Origin)
}
newAlert.Message = types.StrPtr("")
newAlert.Source.Value = types.StrPtr("")
newAlert.StartAt = types.StrPtr(time.Now().UTC().Format(time.RFC3339))
newAlert.StopAt = types.StrPtr(time.Now().UTC().Format(time.RFC3339))
newAlert.Capacity = types.Int32Ptr(0)
newAlert.Simulated = types.BoolPtr(false)
newAlert.EventsCount = types.Int32Ptr(0)
newAlert.Leakspeed = types.StrPtr("")
newAlert.ScenarioHash = types.StrPtr("")
newAlert.ScenarioVersion = types.StrPtr("")
newAlert.MachineID = database.CapiMachineID
return newAlert
}
// This function takes in list of parent alerts and decisions and then pairs them up.
func fillAlertsWithDecisions(alerts []*models.Alert, decisions []*models.Decision, add_counters map[string]map[string]int) []*models.Alert {
for _, decision := range decisions {
//count and create separate alerts for each list
updateCounterForDecision(add_counters, decision, 1)
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/*CAPI might send lower case scopes, unify it.*/
switch strings.ToLower(*decision.Scope) {
case "ip":
*decision.Scope = types.Ip
case "range":
*decision.Scope = types.Range
}
found := false
//add the individual decisions to the right list
for idx, alert := range alerts {
if *decision.Origin == SCOPE_CAPI {
if *alert.Source.Scope == SCOPE_CAPI {
alerts[idx].Decisions = append(alerts[idx].Decisions, decision)
found = true
break
}
} else if *decision.Origin == SCOPE_LISTS {
if *alert.Source.Scope == SCOPE_LISTS && *alert.Scenario == *decision.Scenario {
alerts[idx].Decisions = append(alerts[idx].Decisions, decision)
found = true
break
}
} else {
log.Warningf("unknown origin %s", *decision.Origin)
}
}
if !found {
log.Warningf("Orphaned decision for %s - %s", *decision.Origin, *decision.Scenario)
}
}
return alerts
}
// we receive only one list of decisions, that we need to break-up :
// one alert for "community blocklist"
// one alert per list we're subscribed to
func (a *apic) PullTop() error {
var err error
if lastPullIsOld, err := a.CAPIPullIsOld(); err != nil {
return err
} else if !lastPullIsOld {
return nil
}
data, _, err := a.apiClient.Decisions.GetStream(context.Background(), apiclient.DecisionsStreamOpts{Startup: a.startup})
if err != nil {
return errors.Wrap(err, "get stream")
}
a.startup = false
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/*to count additions/deletions across lists*/
log.Debugf("Received %d new decisions", len(data.New))
log.Debugf("Received %d deleted decisions", len(data.Deleted))
add_counters, delete_counters := makeAddAndDeleteCounters()
// process deleted decisions
if nbDeleted, err := a.HandleDeletedDecisions(data.Deleted, delete_counters); err != nil {
return err
} else {
log.Printf("capi/community-blocklist : %d explicit deletions", nbDeleted)
}
if len(data.New) == 0 {
log.Infof("capi/community-blocklist : received 0 new entries (expected if you just installed crowdsec)")
return nil
}
// we receive only one list of decisions, that we need to break-up :
// one alert for "community blocklist"
// one alert per list we're subscribed to
alertsFromCapi := createAlertsForDecisions(data.New)
alertsFromCapi = fillAlertsWithDecisions(alertsFromCapi, data.New, add_counters)
for idx, alert := range alertsFromCapi {
alertsFromCapi[idx] = setAlertScenario(add_counters, delete_counters, alert)
log.Debugf("%s has %d decisions", *alertsFromCapi[idx].Source.Scope, len(alertsFromCapi[idx].Decisions))
if a.dbClient.Type == "sqlite" && (a.dbClient.WalMode == nil || !*a.dbClient.WalMode) {
log.Warningf("sqlite is not using WAL mode, LAPI might become unresponsive when inserting the community blocklist")
}
alertID, inserted, deleted, err := a.dbClient.UpdateCommunityBlocklist(alertsFromCapi[idx])
if err != nil {
return errors.Wrapf(err, "while saving alert from %s", *alertsFromCapi[idx].Source.Scope)
}
log.Printf("%s : added %d entries, deleted %d entries (alert:%d)", *alertsFromCapi[idx].Source.Scope, inserted, deleted, alertID)
}
return nil
}
func setAlertScenario(add_counters map[string]map[string]int, delete_counters map[string]map[string]int, alert *models.Alert) *models.Alert {
if *alert.Source.Scope == SCOPE_CAPI {
*alert.Source.Scope = SCOPE_CAPI_ALIAS
alert.Scenario = types.StrPtr(fmt.Sprintf("update : +%d/-%d IPs", add_counters[SCOPE_CAPI]["all"], delete_counters[SCOPE_CAPI]["all"]))
} else if *alert.Source.Scope == SCOPE_LISTS {
*alert.Source.Scope = fmt.Sprintf("%s:%s", SCOPE_LISTS, *alert.Scenario)
alert.Scenario = types.StrPtr(fmt.Sprintf("update : +%d/-%d IPs", add_counters[SCOPE_LISTS][*alert.Scenario], delete_counters[SCOPE_LISTS][*alert.Scenario]))
}
return alert
}
func (a *apic) Pull() error {
defer types.CatchPanic("lapi/pullFromAPIC")
toldOnce := false
for {
scenario, err := a.FetchScenariosListFromDB()
if err != nil {
log.Errorf("unable to fetch scenarios from db: %s", err)
}
if len(scenario) > 0 {
break
}
if !toldOnce {
2022-06-22 07:38:23 +00:00
log.Warning("scenario list is empty, will not pull yet")
toldOnce = true
}
time.Sleep(1 * time.Second)
}
if err := a.PullTop(); err != nil {
log.Errorf("capi pull top: %s", err)
}
log.Infof("Start pull from CrowdSec Central API (interval: %s once, then %s)", a.pullIntervalFirst.Round(time.Second), a.pullInterval)
ticker := time.NewTicker(a.pullIntervalFirst)
for {
select {
case <-ticker.C:
ticker.Reset(a.pullInterval)
if err := a.PullTop(); err != nil {
log.Errorf("capi pull top: %s", err)
continue
}
case <-a.pullTomb.Dying(): // if one apic routine is dying, do we kill the others?
a.metricsTomb.Kill(nil)
a.pushTomb.Kill(nil)
return nil
}
}
}
func (a *apic) GetMetrics() (*models.Metrics, error) {
metric := &models.Metrics{
ApilVersion: types.StrPtr(cwversion.VersionStr()),
Machines: make([]*models.MetricsAgentInfo, 0),
Bouncers: make([]*models.MetricsBouncerInfo, 0),
}
machines, err := a.dbClient.ListMachines()
if err != nil {
return metric, err
}
bouncers, err := a.dbClient.ListBouncers()
if err != nil {
return metric, err
}
var lastpush string
for _, machine := range machines {
if machine.LastPush == nil {
lastpush = time.Time{}.String()
} else {
lastpush = machine.LastPush.String()
}
m := &models.MetricsAgentInfo{
Version: machine.Version,
Name: machine.MachineId,
LastUpdate: machine.UpdatedAt.String(),
LastPush: lastpush,
}
metric.Machines = append(metric.Machines, m)
}
for _, bouncer := range bouncers {
m := &models.MetricsBouncerInfo{
Version: bouncer.Version,
CustomName: bouncer.Name,
Name: bouncer.Type,
LastPull: bouncer.LastPull.String(),
}
metric.Bouncers = append(metric.Bouncers, m)
}
return metric, nil
}
func (a *apic) SendMetrics(stop chan (bool)) {
defer types.CatchPanic("lapi/metricsToAPIC")
ticker := time.NewTicker(a.metricsIntervalFirst)
log.Infof("Start send metrics to CrowdSec Central API (interval: %s once, then %s)", a.metricsIntervalFirst.Round(time.Second), a.metricsInterval)
for {
metrics, err := a.GetMetrics()
if err != nil {
log.Errorf("unable to get metrics (%s), will retry", err)
}
_, _, err = a.apiClient.Metrics.Add(context.Background(), metrics)
if err != nil {
log.Errorf("capi metrics: failed: %s", err)
} else {
log.Infof("capi metrics: metrics sent successfully")
}
select {
case <-stop:
return
case <-ticker.C:
ticker.Reset(a.metricsInterval)
case <-a.metricsTomb.Dying(): // if one apic routine is dying, do we kill the others?
a.pullTomb.Kill(nil)
a.pushTomb.Kill(nil)
return
}
}
}
func (a *apic) Shutdown() {
a.pushTomb.Kill(nil)
a.pullTomb.Kill(nil)
a.metricsTomb.Kill(nil)
}
func makeAddAndDeleteCounters() (map[string]map[string]int, map[string]map[string]int) {
add_counters := make(map[string]map[string]int)
add_counters[SCOPE_CAPI] = make(map[string]int)
add_counters[SCOPE_LISTS] = make(map[string]int)
delete_counters := make(map[string]map[string]int)
delete_counters[SCOPE_CAPI] = make(map[string]int)
delete_counters[SCOPE_LISTS] = make(map[string]int)
return add_counters, delete_counters
}
func updateCounterForDecision(counter map[string]map[string]int, decision *models.Decision, totalDecisions int) {
if *decision.Origin == SCOPE_CAPI {
counter[*decision.Origin]["all"] += totalDecisions
} else if *decision.Origin == SCOPE_LISTS {
counter[*decision.Origin][*decision.Scenario] += totalDecisions
} else {
log.Warningf("Unknown origin %s", *decision.Origin)
}
}