130 lines
3.7 KiB
Go
130 lines
3.7 KiB
Go
package exprhelpers
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import (
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"fmt"
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"time"
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"github.com/bluele/gcache"
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"github.com/crowdsecurity/crowdsec/pkg/cticlient"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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var CTIUrl = "https://cti.api.crowdsec.net"
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var CTIUrlSuffix = "/v2/smoke/"
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var CTIApiKey = ""
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// this is set for non-recoverable errors, such as 403 when querying API or empty API key
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var CTIApiEnabled = false
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// when hitting quotas or auth errors, we temporarily disable the API
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var CTIBackOffUntil time.Time
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var CTIBackOffDuration time.Duration = 5 * time.Minute
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var ctiClient *cticlient.CrowdsecCTIClient
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func InitCrowdsecCTI(Key *string, TTL *time.Duration, Size *int, LogLevel *log.Level) error {
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if Key == nil || *Key == "" {
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log.Warningf("CTI API key not set or empty, CTI will not be available")
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return cticlient.ErrDisabled
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}
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CTIApiKey = *Key
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if Size == nil {
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Size = new(int)
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*Size = 1000
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}
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if TTL == nil {
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TTL = new(time.Duration)
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*TTL = 5 * time.Minute
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}
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clog := log.New()
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if err := types.ConfigureLogger(clog); err != nil {
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return errors.Wrap(err, "while configuring datasource logger")
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}
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if LogLevel != nil {
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clog.SetLevel(*LogLevel)
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}
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customLog := log.Fields{
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"type": "crowdsec-cti",
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}
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subLogger := clog.WithFields(customLog)
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CrowdsecCTIInitCache(*Size, *TTL)
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ctiClient = cticlient.NewCrowdsecCTIClient(cticlient.WithAPIKey(CTIApiKey), cticlient.WithLogger(subLogger))
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CTIApiEnabled = true
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return nil
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}
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func ShutdownCrowdsecCTI() {
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if CTICache != nil {
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CTICache.Purge()
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}
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CTIApiKey = ""
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CTIApiEnabled = false
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}
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// Cache for responses
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var CTICache gcache.Cache
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var CacheExpiration time.Duration
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func CrowdsecCTIInitCache(size int, ttl time.Duration) {
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CTICache = gcache.New(size).LRU().Build()
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CacheExpiration = ttl
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}
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// func CrowdsecCTI(ip string) (*cticlient.SmokeItem, error) {
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func CrowdsecCTI(params ...any) (any, error) {
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var ip string
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if !CTIApiEnabled {
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return &cticlient.SmokeItem{}, cticlient.ErrDisabled
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}
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var ok bool
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if ip, ok = params[0].(string); !ok {
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return &cticlient.SmokeItem{}, fmt.Errorf("invalid type for ip : %T", params[0])
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}
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if val, err := CTICache.Get(ip); err == nil && val != nil {
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ctiClient.Logger.Debugf("cti cache fetch for %s", ip)
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ret, ok := val.(*cticlient.SmokeItem)
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if !ok {
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ctiClient.Logger.Warningf("CrowdsecCTI: invalid type in cache, removing")
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CTICache.Remove(ip)
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} else {
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return ret, nil
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}
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}
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if !CTIBackOffUntil.IsZero() && time.Now().Before(CTIBackOffUntil) {
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//ctiClient.Logger.Warningf("Crowdsec CTI client is in backoff mode, ending in %s", time.Until(CTIBackOffUntil))
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return &cticlient.SmokeItem{}, cticlient.ErrLimit
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}
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ctiClient.Logger.Infof("cti call for %s", ip)
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before := time.Now()
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ctiResp, err := ctiClient.GetIPInfo(ip)
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ctiClient.Logger.Debugf("request for %s took %v", ip, time.Since(before))
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if err != nil {
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switch {
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case errors.Is(err, cticlient.ErrUnauthorized):
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CTIApiEnabled = false
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ctiClient.Logger.Errorf("Invalid API key provided, disabling CTI API")
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return &cticlient.SmokeItem{}, cticlient.ErrUnauthorized
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case errors.Is(err, cticlient.ErrLimit):
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CTIBackOffUntil = time.Now().Add(CTIBackOffDuration)
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ctiClient.Logger.Errorf("CTI API is throttled, will try again in %s", CTIBackOffDuration)
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return &cticlient.SmokeItem{}, cticlient.ErrLimit
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default:
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ctiClient.Logger.Warnf("CTI API error : %s", err)
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return &cticlient.SmokeItem{}, fmt.Errorf("unexpected error : %v", err)
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}
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}
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if err := CTICache.SetWithExpire(ip, ctiResp, CacheExpiration); err != nil {
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ctiClient.Logger.Warningf("IpCTI : error while caching CTI : %s", err)
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return &cticlient.SmokeItem{}, cticlient.ErrUnknown
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}
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ctiClient.Logger.Tracef("CTI response : %v", *ctiResp)
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return ctiResp, nil
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}
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