351 lines
10 KiB
Go
351 lines
10 KiB
Go
package apiserver
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"sync"
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"time"
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log "github.com/sirupsen/logrus"
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"gopkg.in/tomb.v2"
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"github.com/crowdsecurity/go-cs-lib/trace"
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"github.com/crowdsecurity/crowdsec/pkg/apiclient"
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"github.com/crowdsecurity/crowdsec/pkg/csconfig"
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"github.com/crowdsecurity/crowdsec/pkg/database"
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"github.com/crowdsecurity/crowdsec/pkg/longpollclient"
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"github.com/crowdsecurity/crowdsec/pkg/models"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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)
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var (
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SyncInterval = time.Second * 10
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)
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const (
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PapiPullKey = "papi:last_pull"
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)
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var (
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operationMap = map[string]func(*Message, *Papi, bool) error{
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"decision": DecisionCmd,
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"alert": AlertCmd,
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"management": ManagementCmd,
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}
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)
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type Header struct {
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OperationType string `json:"operation_type"`
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OperationCmd string `json:"operation_cmd"`
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Timestamp time.Time `json:"timestamp"`
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Message string `json:"message"`
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UUID string `json:"uuid"`
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Source *Source `json:"source"`
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Destination string `json:"destination"`
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}
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type Source struct {
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User string `json:"user"`
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}
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type Message struct {
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Header *Header
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Data interface{} `json:"data"`
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}
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type OperationChannels struct {
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AddAlertChannel chan []*models.Alert
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DeleteDecisionChannel chan []*models.Decision
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}
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type Papi struct {
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URL string
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Client *longpollclient.LongPollClient
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DBClient *database.Client
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apiClient *apiclient.ApiClient
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Channels *OperationChannels
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mu sync.Mutex
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pullTomb tomb.Tomb
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syncTomb tomb.Tomb
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SyncInterval time.Duration
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consoleConfig *csconfig.ConsoleConfig
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Logger *log.Entry
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apic *apic
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}
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type PapiPermCheckError struct {
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Error string `json:"error"`
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}
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type PapiPermCheckSuccess struct {
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Status string `json:"status"`
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Plan string `json:"plan"`
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Categories []string `json:"categories"`
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}
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func NewPAPI(apic *apic, dbClient *database.Client, consoleConfig *csconfig.ConsoleConfig, logLevel log.Level) (*Papi, error) {
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logger := log.New()
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if err := types.ConfigureLogger(logger); err != nil {
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return &Papi{}, fmt.Errorf("creating papi logger: %s", err)
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}
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logger.SetLevel(logLevel)
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papiUrl := *apic.apiClient.PapiURL
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papiUrl.Path = fmt.Sprintf("%s%s", types.PAPIVersion, types.PAPIPollUrl)
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longPollClient, err := longpollclient.NewLongPollClient(longpollclient.LongPollClientConfig{
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Url: papiUrl,
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Logger: logger,
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HttpClient: apic.apiClient.GetClient(),
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})
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if err != nil {
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return &Papi{}, fmt.Errorf("failed to create PAPI client: %w", err)
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}
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channels := &OperationChannels{
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AddAlertChannel: apic.AlertsAddChan,
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DeleteDecisionChannel: make(chan []*models.Decision),
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}
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papi := &Papi{
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URL: apic.apiClient.PapiURL.String(),
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Client: longPollClient,
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DBClient: dbClient,
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Channels: channels,
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SyncInterval: SyncInterval,
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mu: sync.Mutex{},
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pullTomb: tomb.Tomb{},
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syncTomb: tomb.Tomb{},
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apiClient: apic.apiClient,
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apic: apic,
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consoleConfig: consoleConfig,
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Logger: logger.WithFields(log.Fields{"interval": SyncInterval.Seconds(), "source": "papi"}),
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}
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return papi, nil
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}
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func (p *Papi) handleEvent(event longpollclient.Event, sync bool) error {
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logger := p.Logger.WithField("request-id", event.RequestId)
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logger.Debugf("message received: %+v", event.Data)
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message := &Message{}
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if err := json.Unmarshal([]byte(event.Data), message); err != nil {
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return fmt.Errorf("polling papi message format is not compatible: %+v: %s", event.Data, err)
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}
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if message.Header == nil {
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return fmt.Errorf("no header in message, skipping")
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}
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if message.Header.Source == nil {
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return fmt.Errorf("no source user in header message, skipping")
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}
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if operationFunc, ok := operationMap[message.Header.OperationType]; ok {
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logger.Debugf("Calling operation '%s'", message.Header.OperationType)
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err := operationFunc(message, p, sync)
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if err != nil {
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return fmt.Errorf("'%s %s failed: %s", message.Header.OperationType, message.Header.OperationCmd, err)
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}
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} else {
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return fmt.Errorf("operation '%s' unknown, continue", message.Header.OperationType)
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}
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return nil
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}
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func (p *Papi) GetPermissions() (PapiPermCheckSuccess, error) {
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httpClient := p.apiClient.GetClient()
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papiCheckUrl := fmt.Sprintf("%s%s%s", p.URL, types.PAPIVersion, types.PAPIPermissionsUrl)
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req, err := http.NewRequest(http.MethodGet, papiCheckUrl, nil)
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if err != nil {
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return PapiPermCheckSuccess{}, fmt.Errorf("failed to create request : %s", err)
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}
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resp, err := httpClient.Do(req)
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if err != nil {
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log.Fatalf("failed to get response : %s", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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errResp := PapiPermCheckError{}
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err = json.NewDecoder(resp.Body).Decode(&errResp)
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if err != nil {
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return PapiPermCheckSuccess{}, fmt.Errorf("failed to decode response : %s", err)
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}
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return PapiPermCheckSuccess{}, fmt.Errorf("unable to query PAPI : %s (%d)", errResp.Error, resp.StatusCode)
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}
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respBody := PapiPermCheckSuccess{}
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err = json.NewDecoder(resp.Body).Decode(&respBody)
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if err != nil {
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return PapiPermCheckSuccess{}, fmt.Errorf("failed to decode response : %s", err)
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}
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return respBody, nil
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}
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func reverse(s []longpollclient.Event) []longpollclient.Event {
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a := make([]longpollclient.Event, len(s))
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copy(a, s)
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for i := len(a)/2 - 1; i >= 0; i-- {
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opp := len(a) - 1 - i
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a[i], a[opp] = a[opp], a[i]
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}
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return a
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}
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func (p *Papi) PullOnce(since time.Time, sync bool) error {
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events, err := p.Client.PullOnce(since)
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if err != nil {
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return err
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}
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reversedEvents := reverse(events) //PAPI sends events in the reverse order, which is not an issue when pulling them in real time, but here we need the correct order
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eventsCount := len(events)
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p.Logger.Infof("received %d events", eventsCount)
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for i, event := range reversedEvents {
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if err := p.handleEvent(event, sync); err != nil {
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p.Logger.WithField("request-id", event.RequestId).Errorf("failed to handle event: %s", err)
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}
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p.Logger.Debugf("handled event %d/%d", i, eventsCount)
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}
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p.Logger.Debugf("finished handling events")
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//Don't update the timestamp in DB, as a "real" LAPI might be running
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//Worst case, crowdsec will receive a few duplicated events and will discard them
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return nil
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}
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// PullPAPI is the long polling client for real-time decisions from PAPI
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func (p *Papi) Pull() error {
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defer trace.CatchPanic("lapi/PullPAPI")
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p.Logger.Infof("Starting Polling API Pull")
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lastTimestamp := time.Time{}
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lastTimestampStr, err := p.DBClient.GetConfigItem(PapiPullKey)
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if err != nil {
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p.Logger.Warningf("failed to get last timestamp for papi pull: %s", err)
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}
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//value doesn't exist, it's first time we're pulling
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if lastTimestampStr == nil {
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binTime, err := lastTimestamp.MarshalText()
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if err != nil {
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return fmt.Errorf("failed to marshal last timestamp: %w", err)
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}
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if err := p.DBClient.SetConfigItem(PapiPullKey, string(binTime)); err != nil {
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p.Logger.Errorf("error setting papi pull last key: %s", err)
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} else {
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p.Logger.Debugf("config item '%s' set in database with value '%s'", PapiPullKey, string(binTime))
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}
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} else {
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if err := lastTimestamp.UnmarshalText([]byte(*lastTimestampStr)); err != nil {
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return fmt.Errorf("failed to unmarshal last timestamp: %w", err)
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}
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}
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p.Logger.Infof("Starting PAPI pull (since:%s)", lastTimestamp)
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for event := range p.Client.Start(lastTimestamp) {
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logger := p.Logger.WithField("request-id", event.RequestId)
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//update last timestamp in database
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newTime := time.Now().UTC()
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binTime, err := newTime.MarshalText()
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if err != nil {
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return fmt.Errorf("failed to marshal last timestamp: %w", err)
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}
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err = p.handleEvent(event, false)
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if err != nil {
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logger.Errorf("failed to handle event: %s", err)
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continue
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}
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if err := p.DBClient.SetConfigItem(PapiPullKey, string(binTime)); err != nil {
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return fmt.Errorf("failed to update last timestamp: %w", err)
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} else {
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logger.Debugf("set last timestamp to %s", newTime)
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}
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}
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return nil
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}
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func (p *Papi) SyncDecisions() error {
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defer trace.CatchPanic("lapi/syncDecisionsToCAPI")
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var cache models.DecisionsDeleteRequest
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ticker := time.NewTicker(p.SyncInterval)
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p.Logger.Infof("Start decisions sync to CrowdSec Central API (interval: %s)", p.SyncInterval)
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for {
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select {
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case <-p.syncTomb.Dying(): // if one apic routine is dying, do we kill the others?
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p.Logger.Infof("sync decisions tomb is dying, sending cache (%d elements) before exiting", len(cache))
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if len(cache) == 0 {
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return nil
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}
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go p.SendDeletedDecisions(&cache)
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return nil
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case <-ticker.C:
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if len(cache) > 0 {
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p.mu.Lock()
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cacheCopy := cache
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cache = make([]models.DecisionsDeleteRequestItem, 0)
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p.mu.Unlock()
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p.Logger.Infof("sync decisions: %d deleted decisions to push", len(cacheCopy))
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go p.SendDeletedDecisions(&cacheCopy)
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}
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case deletedDecisions := <-p.Channels.DeleteDecisionChannel:
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if (p.consoleConfig.ShareManualDecisions != nil && *p.consoleConfig.ShareManualDecisions) || (p.consoleConfig.ConsoleManagement != nil && *p.consoleConfig.ConsoleManagement) {
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var tmpDecisions []models.DecisionsDeleteRequestItem
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p.Logger.Debugf("%d decisions deletion to add in cache", len(deletedDecisions))
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for _, decision := range deletedDecisions {
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tmpDecisions = append(tmpDecisions, models.DecisionsDeleteRequestItem(decision.UUID))
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}
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p.mu.Lock()
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cache = append(cache, tmpDecisions...)
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p.mu.Unlock()
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}
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}
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}
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}
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func (p *Papi) SendDeletedDecisions(cacheOrig *models.DecisionsDeleteRequest) {
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var cache []models.DecisionsDeleteRequestItem = *cacheOrig
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var send models.DecisionsDeleteRequest
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bulkSize := 50
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pageStart := 0
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pageEnd := bulkSize
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for {
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if pageEnd >= len(cache) {
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send = cache[pageStart:]
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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_, _, err := p.apiClient.DecisionDelete.Add(ctx, &send)
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if err != nil {
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p.Logger.Errorf("sending deleted decisions to central API: %s", err)
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return
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}
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break
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}
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send = cache[pageStart:pageEnd]
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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_, _, err := p.apiClient.DecisionDelete.Add(ctx, &send)
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if err != nil {
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//we log it here as well, because the return value of func might be discarded
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p.Logger.Errorf("sending deleted decisions to central API: %s", err)
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}
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pageStart += bulkSize
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pageEnd += bulkSize
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}
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}
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func (p *Papi) Shutdown() {
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p.Logger.Infof("Shutting down PAPI")
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p.syncTomb.Kill(nil)
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p.Client.Stop()
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}
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