601 lines
20 KiB
Go
601 lines
20 KiB
Go
package leakybucket
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"math"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/crowdsecurity/crowdsec/pkg/cwversion"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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"github.com/davecgh/go-spew/spew"
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"github.com/prometheus/client_golang/prometheus"
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log "github.com/sirupsen/logrus"
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"github.com/antonmedv/expr"
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"github.com/antonmedv/expr/vm"
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"github.com/goombaio/namegenerator"
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yaml "gopkg.in/yaml.v2"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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)
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// BucketFactory struct holds all fields for any bucket configuration. This is to have a
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// generic struct for buckets. This can be seen as a bucket factory.
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type BucketFactory struct {
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FormatVersion string `yaml:"format"`
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Author string `yaml:"author"`
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Description string `yaml:"description"`
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References []string `yaml:"references"`
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Type string `yaml:"type"` //Type can be : leaky, counter, trigger. It determines the main bucket characteristics
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Name string `yaml:"name"` //Name of the bucket, used later in log and user-messages. Should be unique
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Capacity int `yaml:"capacity"` //Capacity is applicable to leaky buckets and determines the "burst" capacity
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LeakSpeed string `yaml:"leakspeed"` //Leakspeed is a float representing how many events per second leak out of the bucket
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Duration string `yaml:"duration"` //Duration allows 'counter' buckets to have a fixed life-time
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Filter string `yaml:"filter"` //Filter is an expr that determines if an event is elligible for said bucket. Filter is evaluated against the Event struct
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GroupBy string `yaml:"groupby,omitempty"` //groupy is an expr that allows to determine the partitions of the bucket. A common example is the source_ip
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Distinct string `yaml:"distinct"` //Distinct, when present, adds a `Pour()` processor that will only pour uniq items (based on uniq_filter expr result)
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Debug bool `yaml:"debug"` //Debug, when set to true, will enable debugging for _this_ scenario specifically
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Labels map[string]string `yaml:"labels"` //Labels is K:V list aiming at providing context the overflow
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Blackhole string `yaml:"blackhole,omitempty"` //Blackhole is a duration that, if present, will prevent same bucket partition to overflow more often than $duration
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logger *log.Entry `yaml:"-"` //logger is bucket-specific logger (used by Debug as well)
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Reprocess bool `yaml:"reprocess"` //Reprocess, if true, will for the bucket to be re-injected into processing chain
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CacheSize int `yaml:"cache_size"` //CacheSize, if > 0, limits the size of in-memory cache of the bucket
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Profiling bool `yaml:"profiling"` //Profiling, if true, will make the bucket record pours/overflows/etc.
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OverflowFilter string `yaml:"overflow_filter"` //OverflowFilter if present, is a filter that must return true for the overflow to go through
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BucketName string `yaml:"-"`
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Filename string `yaml:"-"`
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RunTimeFilter *vm.Program `json:"-"`
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RunTimeGroupBy *vm.Program `json:"-"`
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Data []*types.DataSource `yaml:"data,omitempty"`
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leakspeed time.Duration //internal representation of `Leakspeed`
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duration time.Duration //internal representation of `Duration`
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ret chan types.Event //the bucket-specific output chan for overflows
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processors []Processor //processors is the list of hooks for pour/overflow/create (cf. uniq, blackhole etc.)
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output bool //??
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}
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func ValidateFactory(b *BucketFactory) error {
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if b.Name == "" {
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return fmt.Errorf("bucket must have name")
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}
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if b.Description == "" {
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return fmt.Errorf("description is mandatory")
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}
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if b.Type == "leaky" {
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if b.Capacity <= 0 { //capacity must be a positive int
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return fmt.Errorf("bad capacity for leaky '%d'", b.Capacity)
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}
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if b.LeakSpeed == "" {
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return fmt.Errorf("leakspeed can't be empty for leaky")
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}
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if b.leakspeed == 0 {
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return fmt.Errorf("bad leakspeed for leaky '%s'", b.LeakSpeed)
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}
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} else if b.Type == "counter" {
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if b.Duration == "" {
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return fmt.Errorf("duration ca't be empty for counter")
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}
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if b.duration == 0 {
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return fmt.Errorf("bad duration for counter bucket '%d'", b.duration)
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}
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if b.Capacity != -1 {
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return fmt.Errorf("counter bucket must have -1 capacity")
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}
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} else if b.Type == "trigger" {
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if b.Capacity != 0 {
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return fmt.Errorf("trigger bucket must have 0 capacity")
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}
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} else {
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return fmt.Errorf("unknown bucket type '%s'", b.Type)
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}
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return nil
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}
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/* Init recursively process yaml files from a directory and loads them as BucketFactory */
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func Init(cfg map[string]string) ([]BucketFactory, chan types.Event, error) {
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return LoadBucketDir(cfg["patterns"], cfg["data"])
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}
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func LoadBuckets(files []string, dataFolder string) ([]BucketFactory, chan types.Event, error) {
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var (
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ret []BucketFactory = []BucketFactory{}
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response chan types.Event
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)
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var seed namegenerator.Generator = namegenerator.NewNameGenerator(time.Now().UTC().UnixNano())
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err := exprhelpers.Init()
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if err != nil {
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return nil, nil, err
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}
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response = make(chan types.Event, 1)
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for _, f := range files {
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log.Debugf("Loading %s", f)
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if !strings.HasSuffix(f, ".yaml") {
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log.Debugf("Skipping %s : not a yaml file", f)
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continue
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}
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//process the yaml
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bucketConfigurationFile, err := os.Open(f)
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if err != nil {
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log.Errorf("Can't access leaky configuration file %s", f)
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return nil, nil, err
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}
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dec := yaml.NewDecoder(bucketConfigurationFile)
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dec.SetStrict(true)
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for {
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g := BucketFactory{}
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err = dec.Decode(&g)
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if err != nil {
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if err == io.EOF {
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log.Tracef("End of yaml file")
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break
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} else {
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log.Errorf("Bad yaml in %s : %v", f, err)
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return nil, nil, fmt.Errorf("bad yaml in %s : %v", f, err)
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}
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}
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//check empty
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if g.Name == "" {
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log.Errorf("Won't load nameless bucket")
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return nil, nil, fmt.Errorf("nameless bucket")
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}
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//check compat
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if g.FormatVersion == "" {
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log.Warningf("no version in %s : %s, assuming '1.0'", g.Name, f)
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g.FormatVersion = "1.0"
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}
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ok, err := cwversion.Statisfies(g.FormatVersion, cwversion.Constraint_scenario)
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if err != nil {
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log.Fatalf("Failed to check version : %s", err)
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}
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if !ok {
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log.Errorf("can't load %s : %s doesn't satisfy scenario format %s, skip", g.Name, g.FormatVersion, cwversion.Constraint_scenario)
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continue
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}
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g.Filename = filepath.Clean(f)
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g.BucketName = seed.Generate()
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g.ret = response
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err = LoadBucket(&g, dataFolder)
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if err != nil {
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log.Errorf("Failed to load bucket : %v", err)
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return nil, nil, fmt.Errorf("loadBucket failed : %v", err)
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}
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ret = append(ret, g)
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}
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}
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log.Warningf("Loaded %d scenarios", len(ret))
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return ret, response, nil
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}
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func LoadBucketDir(dir string, dataFolder string) ([]BucketFactory, chan types.Event, error) {
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var (
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filenames []string
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)
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files, err := ioutil.ReadDir(dir)
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if err != nil {
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return nil, nil, err
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}
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for _, f := range files {
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filenames = append(filenames, dir+f.Name())
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}
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return LoadBuckets(filenames, dataFolder)
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}
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/* Init recursively process yaml files from a directory and loads them as BucketFactory */
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func LoadBucket(g *BucketFactory, dataFolder string) error {
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var err error
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if g.Debug {
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var clog = log.New()
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clog.SetFormatter(&log.TextFormatter{FullTimestamp: true})
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clog.SetLevel(log.DebugLevel)
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g.logger = clog.WithFields(log.Fields{
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"cfg": g.BucketName,
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"name": g.Name,
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"file": g.Filename,
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})
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} else {
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/* else bind it to the default one (might find something more elegant here)*/
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g.logger = log.WithFields(log.Fields{
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"cfg": g.BucketName,
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"name": g.Name,
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"file": g.Filename,
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})
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}
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if g.LeakSpeed != "" {
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if g.leakspeed, err = time.ParseDuration(g.LeakSpeed); err != nil {
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return fmt.Errorf("bad leakspeed '%s' in %s : %v", g.LeakSpeed, g.Filename, err)
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}
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} else {
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g.leakspeed = time.Duration(0)
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}
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if g.Duration != "" {
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if g.duration, err = time.ParseDuration(g.Duration); err != nil {
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return fmt.Errorf("invalid Duration '%s' in %s : %v", g.Duration, g.Filename, err)
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}
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}
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if g.Filter == "" {
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g.logger.Warningf("Bucket without filter, abort.")
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return fmt.Errorf("bucket without filter directive")
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}
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g.RunTimeFilter, err = expr.Compile(g.Filter, expr.Env(exprhelpers.GetExprEnv(map[string]interface{}{"evt": &types.Event{}})))
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if err != nil {
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return fmt.Errorf("invalid filter '%s' in %s : %v", g.Filter, g.Filename, err)
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}
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if g.GroupBy != "" {
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g.RunTimeGroupBy, err = expr.Compile(g.GroupBy, expr.Env(exprhelpers.GetExprEnv(map[string]interface{}{"evt": &types.Event{}})))
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if err != nil {
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return fmt.Errorf("invalid groupby '%s' in %s : %v", g.GroupBy, g.Filename, err)
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}
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}
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g.logger.Infof("Adding %s bucket", g.Type)
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//return the Holder correponding to the type of bucket
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g.processors = []Processor{}
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switch g.Type {
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case "leaky":
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g.processors = append(g.processors, &DumbProcessor{})
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case "trigger":
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g.processors = append(g.processors, &Trigger{})
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case "counter":
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g.processors = append(g.processors, &DumbProcessor{})
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default:
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return fmt.Errorf("invalid type '%s' in %s : %v", g.Type, g.Filename, err)
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}
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if g.Distinct != "" {
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g.logger.Debugf("Adding a non duplicate filter on %s.", g.Name)
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g.processors = append(g.processors, &Uniq{})
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}
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if g.OverflowFilter != "" {
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g.logger.Debugf("Adding an overflow filter")
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filovflw, err := NewOverflowFilter(g)
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if err != nil {
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g.logger.Errorf("Error creating overflow_filter : %s", err)
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return fmt.Errorf("error creating overflow_filter : %s", err)
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}
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g.processors = append(g.processors, filovflw)
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}
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if g.Blackhole != "" {
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g.logger.Debugf("Adding blackhole.")
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blackhole, err := NewBlackhole(g)
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if err != nil {
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g.logger.Errorf("Error creating blackhole : %s", err)
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return fmt.Errorf("error creating blackhole : %s", err)
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}
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g.processors = append(g.processors, blackhole)
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}
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if len(g.Data) > 0 {
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for _, data := range g.Data {
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err = exprhelpers.FileInit(dataFolder, data.DestPath, data.Type)
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if err != nil {
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g.logger.Errorf("unable to init data for file '%s': %s", data.Filename, err.Error())
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}
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}
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}
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g.output = false
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if err := ValidateFactory(g); err != nil {
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return fmt.Errorf("invalid bucket from %s : %v", g.Filename, err)
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}
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return nil
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}
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func LoadBucketsState(file string, buckets *Buckets, holders []BucketFactory) error {
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var state map[string]Leaky
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body, err := ioutil.ReadFile(file)
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if err != nil {
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return fmt.Errorf("can't state file %s : %s", file, err)
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}
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if err := json.Unmarshal(body, &state); err != nil {
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return fmt.Errorf("can't unmarshal state file %s : %s", file, err)
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}
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for k, v := range state {
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var tbucket *Leaky
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log.Debugf("Reloading bucket %s", k)
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val, ok := buckets.Bucket_map.Load(k)
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if ok {
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log.Fatalf("key %s already exists : %+v", k, val)
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}
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//find back our holder
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found := false
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for _, h := range holders {
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if h.Name == v.Name {
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log.Debugf("found factory %s/%s -> %s", h.Author, h.Name, h.Description)
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//check in which mode the bucket was
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if v.Mode == TIMEMACHINE {
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tbucket = NewTimeMachine(h)
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} else if v.Mode == LIVE {
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tbucket = NewLeaky(h)
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} else {
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log.Errorf("Unknown bucket type : %d", v.Mode)
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}
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/*Trying to restore queue state*/
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tbucket.Queue = v.Queue
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/*Trying to set the limiter to the saved values*/
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tbucket.Limiter.Load(v.SerializedState)
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tbucket.In = make(chan types.Event)
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tbucket.Mapkey = k
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tbucket.Signal = make(chan bool, 1)
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tbucket.KillSwitch = make(chan bool, 1)
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tbucket.First_ts = v.First_ts
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tbucket.Last_ts = v.Last_ts
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tbucket.Ovflw_ts = v.Ovflw_ts
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tbucket.Total_count = v.Total_count
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buckets.Bucket_map.Store(k, tbucket)
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go LeakRoutine(tbucket)
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<-tbucket.Signal
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found = true
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break
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}
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}
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if !found {
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log.Fatalf("Unable to find holder for bucket %s : %s", k, spew.Sdump(v))
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}
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}
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log.Infof("Restored %d buckets from dump", len(state))
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return nil
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}
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var serialized map[string]Leaky
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/*The leaky routines lifecycle are based on "real" time.
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But when we are running in time-machine mode, the reference time is in logs and not "real" time.
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Thus we need to garbage collect them to avoid a skyrocketing memory usage.*/
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func GarbageCollectBuckets(deadline time.Time, buckets *Buckets) error {
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total := 0
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discard := 0
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toflush := []string{}
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buckets.Bucket_map.Range(func(rkey, rvalue interface{}) bool {
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key := rkey.(string)
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val := rvalue.(*Leaky)
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total += 1
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if !val.Ovflw_ts.IsZero() {
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discard += 1
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val.logger.Debugf("overflowed at %s.", val.Ovflw_ts)
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toflush = append(toflush, key)
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val.KillSwitch <- true
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return true
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}
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/*FIXME : sometimes the gettokenscountat has some rounding issues when we try to
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match it with bucket capacity, even if the bucket has long due underflow. Round to 2 decimals*/
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tokat := val.Limiter.GetTokensCountAt(deadline)
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tokcapa := float64(val.Capacity)
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tokat = math.Round(tokat*100) / 100
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tokcapa = math.Round(tokcapa*100) / 100
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if tokat >= tokcapa {
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BucketsUnderflow.With(prometheus.Labels{"name": val.Name}).Inc()
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val.logger.Debugf("UNDERFLOW : first_ts:%s tokens_at:%f capcity:%f", val.First_ts, tokat, tokcapa)
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toflush = append(toflush, key)
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val.KillSwitch <- true
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return true
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} else {
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val.logger.Debugf("(%s) not dead, count:%f capacity:%f", val.First_ts, tokat, tokcapa)
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}
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if _, ok := serialized[key]; ok {
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log.Errorf("entry %s already exists", key)
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return false
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} else {
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log.Debugf("serialize %s of %s : %s", val.Name, val.Uuid, val.Mapkey)
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}
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return true
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})
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log.Infof("Cleaned %d buckets", len(toflush))
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for _, flushkey := range toflush {
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buckets.Bucket_map.Delete(flushkey)
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}
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return nil
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}
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func DumpBucketsStateAt(file string, deadline time.Time, buckets *Buckets) error {
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serialized = make(map[string]Leaky)
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log.Printf("Dumping buckets state at %s", deadline)
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total := 0
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discard := 0
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buckets.Bucket_map.Range(func(rkey, rvalue interface{}) bool {
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key := rkey.(string)
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val := rvalue.(*Leaky)
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total += 1
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if !val.Ovflw_ts.IsZero() {
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discard += 1
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val.logger.Debugf("overflowed at %s.", val.Ovflw_ts)
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return true
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}
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/*FIXME : sometimes the gettokenscountat has some rounding issues when we try to
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match it with bucket capacity, even if the bucket has long due underflow. Round to 2 decimals*/
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tokat := val.Limiter.GetTokensCountAt(deadline)
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tokcapa := float64(val.Capacity)
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tokat = math.Round(tokat*100) / 100
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tokcapa = math.Round(tokcapa*100) / 100
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if tokat >= tokcapa {
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BucketsUnderflow.With(prometheus.Labels{"name": val.Name}).Inc()
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val.logger.Debugf("UNDERFLOW : first_ts:%s tokens_at:%f capcity:%f", val.First_ts, tokat, tokcapa)
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discard += 1
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return true
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} else {
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val.logger.Debugf("(%s) not dead, count:%f capacity:%f", val.First_ts, tokat, tokcapa)
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}
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if _, ok := serialized[key]; ok {
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log.Errorf("entry %s already exists", key)
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return false
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} else {
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log.Debugf("serialize %s of %s : %s", val.Name, val.Uuid, val.Mapkey)
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}
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val.SerializedState = val.Limiter.Dump()
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serialized[key] = *val
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return true
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})
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bbuckets, err := json.MarshalIndent(serialized, "", " ")
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if err != nil {
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log.Fatalf("Failed to unmarshal buckets : %s", err)
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}
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err = ioutil.WriteFile(file, bbuckets, 0644)
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if err != nil {
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log.Fatalf("Failed to write buckets state %s", err)
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}
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log.Warningf("Serialized %d live buckets state, %d total with %d expired to %s", len(serialized), total, discard, file)
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return nil
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}
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func PourItemToHolders(parsed types.Event, holders []BucketFactory, buckets *Buckets) (bool, error) {
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var (
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ok, condition, sent bool
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err error
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)
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for idx, holder := range holders {
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if holder.RunTimeFilter != nil {
|
|
log.Debugf("event against holder %d/%d", idx, len(holders))
|
|
output, err := expr.Run(holder.RunTimeFilter, exprhelpers.GetExprEnv(map[string]interface{}{"evt": &parsed}))
|
|
if err != nil {
|
|
holder.logger.Errorf("failed parsing : %v", err)
|
|
return false, fmt.Errorf("leaky failed : %s", err)
|
|
}
|
|
// we assume we a bool should add type check here
|
|
if condition, ok = output.(bool); !ok {
|
|
holder.logger.Errorf("unexpected non-bool return : %T", output)
|
|
log.Fatalf("Filter issue")
|
|
}
|
|
if !condition {
|
|
holder.logger.Debugf("eval(FALSE) %s", holder.Filter)
|
|
//log.Debugf("%s -> FALSE", holder.Filter)
|
|
//holder.logger.Debugf("Filter eval failed")
|
|
continue
|
|
} else {
|
|
holder.logger.Debugf("eval(TRUE) %s", holder.Filter)
|
|
}
|
|
}
|
|
|
|
sent = false
|
|
var groupby string
|
|
if holder.RunTimeGroupBy != nil {
|
|
tmpGroupBy, err := expr.Run(holder.RunTimeGroupBy, exprhelpers.GetExprEnv(map[string]interface{}{"evt": &parsed}))
|
|
if err != nil {
|
|
log.Errorf("failed groupby : %v", err)
|
|
return false, errors.New("leaky failed :/")
|
|
}
|
|
|
|
if groupby, ok = tmpGroupBy.(string); !ok {
|
|
log.Fatalf("failed groupby type : %v", err)
|
|
return false, errors.New("groupby wrong type")
|
|
}
|
|
}
|
|
buckey := GetKey(holder, groupby)
|
|
|
|
sigclosed := 0
|
|
keymiss := 0
|
|
failed_sent := 0
|
|
attempts := 0
|
|
start := time.Now()
|
|
for !sent {
|
|
attempts += 1
|
|
/* Warn the user if we used more than a 100 ms to pour an event, it's at least an half lock*/
|
|
if attempts%100000 == 0 && start.Add(100*time.Millisecond).Before(time.Now()) {
|
|
log.Warningf("stuck for %s sending event to %s (sigclosed:%d keymiss:%d failed_sent:%d attempts:%d)", time.Since(start),
|
|
buckey, sigclosed, keymiss, failed_sent, attempts)
|
|
}
|
|
biface, ok := buckets.Bucket_map.Load(buckey)
|
|
//biface, bigout
|
|
/* the bucket doesn't exist, create it !*/
|
|
if !ok {
|
|
/*
|
|
not found in map
|
|
*/
|
|
|
|
log.Debugf("Creating bucket %s", buckey)
|
|
keymiss += 1
|
|
var fresh_bucket *Leaky
|
|
|
|
switch parsed.ExpectMode {
|
|
case TIMEMACHINE:
|
|
fresh_bucket = NewTimeMachine(holder)
|
|
holder.logger.Debugf("Creating TimeMachine bucket")
|
|
case LIVE:
|
|
fresh_bucket = NewLeaky(holder)
|
|
holder.logger.Debugf("Creating Live bucket")
|
|
default:
|
|
log.Fatalf("input event has no expected mode, malformed : %+v", parsed)
|
|
}
|
|
fresh_bucket.In = make(chan types.Event)
|
|
fresh_bucket.Mapkey = buckey
|
|
fresh_bucket.Signal = make(chan bool, 1)
|
|
fresh_bucket.KillSwitch = make(chan bool, 1)
|
|
buckets.Bucket_map.Store(buckey, fresh_bucket)
|
|
go LeakRoutine(fresh_bucket)
|
|
log.Debugf("Created new bucket %s", buckey)
|
|
//wait for signal to be opened
|
|
<-fresh_bucket.Signal
|
|
continue
|
|
}
|
|
|
|
bucket := biface.(*Leaky)
|
|
/* check if leak routine is up */
|
|
select {
|
|
case _, ok := <-bucket.Signal:
|
|
if !ok {
|
|
//it's closed, delete it
|
|
bucket.logger.Debugf("Bucket %s found dead, cleanup the body", buckey)
|
|
buckets.Bucket_map.Delete(buckey)
|
|
sigclosed += 1
|
|
continue
|
|
}
|
|
log.Debugf("Signal exists, try to pour :)")
|
|
|
|
default:
|
|
/*nothing to read, but not closed, try to pour */
|
|
log.Debugf("Signal exists but empty, try to pour :)")
|
|
|
|
}
|
|
/*let's see if this time-bucket should have expired */
|
|
if bucket.Mode == TIMEMACHINE && !bucket.First_ts.IsZero() {
|
|
var d time.Time
|
|
err = d.UnmarshalText([]byte(parsed.MarshaledTime))
|
|
if err != nil {
|
|
log.Warningf("Failed unmarshaling event time (%s) : %v", parsed.MarshaledTime, err)
|
|
}
|
|
if d.After(bucket.Last_ts.Add(bucket.Duration)) {
|
|
bucket.logger.Debugf("bucket is expired (curr event: %s, bucket deadline: %s), kill", d, bucket.Last_ts.Add(bucket.Duration))
|
|
buckets.Bucket_map.Delete(buckey)
|
|
continue
|
|
}
|
|
}
|
|
/*if we're here, let's try to pour */
|
|
|
|
select {
|
|
case bucket.In <- parsed:
|
|
log.Debugf("Successfully sent !")
|
|
//sent was successful !
|
|
sent = true
|
|
continue
|
|
default:
|
|
failed_sent += 1
|
|
log.Debugf("Failed to send, try again")
|
|
continue
|
|
|
|
}
|
|
}
|
|
|
|
log.Debugf("bucket '%s' is poured", holder.Name)
|
|
}
|
|
return sent, nil
|
|
}
|