466 lines
19 KiB
Go
466 lines
19 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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"os"
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"path/filepath"
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"strings"
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"sync"
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"time"
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"github.com/antonmedv/expr"
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"github.com/antonmedv/expr/vm"
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"github.com/davecgh/go-spew/spew"
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"github.com/goombaio/namegenerator"
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log "github.com/sirupsen/logrus"
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"gopkg.in/tomb.v2"
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yaml "gopkg.in/yaml.v2"
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"github.com/crowdsecurity/crowdsec/pkg/alertcontext"
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"github.com/crowdsecurity/crowdsec/pkg/csconfig"
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"github.com/crowdsecurity/crowdsec/pkg/cwhub"
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"github.com/crowdsecurity/crowdsec/pkg/cwversion"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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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 distinct 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]interface{} `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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ConditionalOverflow string `yaml:"condition"` //condition if present, is an expression that must return true for the bucket to overflow
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BayesianPrior float32 `yaml:"bayesian_prior"`
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BayesianThreshold float32 `yaml:"bayesian_threshold"`
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BayesianConditions []RawBayesianCondition `yaml:"bayesian_conditions"` //conditions for the bayesian bucket
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ScopeType types.ScopeType `yaml:"scope,omitempty"` //to enforce a different remediation than blocking an IP. Will default this to IP
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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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DataDir string `yaml:"-"`
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CancelOnFilter string `yaml:"cancel_on,omitempty"` //a filter that, if matched, kills the bucket
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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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ScenarioVersion string `yaml:"version,omitempty"`
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hash string `yaml:"-"`
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Simulated bool `yaml:"simulated"` //Set to true if the scenario instantiating the bucket was in the exclusion list
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tomb *tomb.Tomb `yaml:"-"`
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wgPour *sync.WaitGroup `yaml:"-"`
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wgDumpState *sync.WaitGroup `yaml:"-"`
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orderEvent bool
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}
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// we use one NameGenerator for all the future buckets
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var seed namegenerator.Generator = namegenerator.NewNameGenerator(time.Now().UTC().UnixNano())
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func ValidateFactory(bucketFactory *BucketFactory) error {
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if bucketFactory.Name == "" {
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return fmt.Errorf("bucket must have name")
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}
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if bucketFactory.Description == "" {
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return fmt.Errorf("description is mandatory")
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}
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if bucketFactory.Type == "leaky" {
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if bucketFactory.Capacity <= 0 { //capacity must be a positive int
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return fmt.Errorf("bad capacity for leaky '%d'", bucketFactory.Capacity)
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}
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if bucketFactory.LeakSpeed == "" {
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return fmt.Errorf("leakspeed can't be empty for leaky")
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}
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if bucketFactory.leakspeed == 0 {
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return fmt.Errorf("bad leakspeed for leaky '%s'", bucketFactory.LeakSpeed)
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}
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} else if bucketFactory.Type == "counter" {
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if bucketFactory.Duration == "" {
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return fmt.Errorf("duration can't be empty for counter")
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}
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if bucketFactory.duration == 0 {
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return fmt.Errorf("bad duration for counter bucket '%d'", bucketFactory.duration)
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}
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if bucketFactory.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 bucketFactory.Type == "trigger" {
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if bucketFactory.Capacity != 0 {
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return fmt.Errorf("trigger bucket must have 0 capacity")
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}
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} else if bucketFactory.Type == "conditional" {
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if bucketFactory.ConditionalOverflow == "" {
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return fmt.Errorf("conditional bucket must have a condition")
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}
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if bucketFactory.Capacity != -1 {
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bucketFactory.logger.Warnf("Using a value different than -1 as capacity for conditional bucket, this may lead to unexpected overflows")
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}
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if bucketFactory.LeakSpeed == "" {
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return fmt.Errorf("leakspeed can't be empty for conditional bucket")
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}
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if bucketFactory.leakspeed == 0 {
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return fmt.Errorf("bad leakspeed for conditional bucket '%s'", bucketFactory.LeakSpeed)
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}
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} else if bucketFactory.Type == "bayesian" {
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if bucketFactory.BayesianConditions == nil {
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return fmt.Errorf("bayesian bucket must have bayesian conditions")
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}
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if bucketFactory.BayesianPrior == 0 {
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return fmt.Errorf("bayesian bucket must have a valid, non-zero prior")
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}
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if bucketFactory.BayesianThreshold == 0 {
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return fmt.Errorf("bayesian bucket must have a valid, non-zero threshold")
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}
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if bucketFactory.BayesianPrior > 1 {
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return fmt.Errorf("bayesian bucket must have a valid, non-zero prior")
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}
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if bucketFactory.BayesianThreshold > 1 {
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return fmt.Errorf("bayesian bucket must have a valid, non-zero threshold")
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}
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if bucketFactory.Capacity != -1 {
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return fmt.Errorf("bayesian bucket must have capacity -1")
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}
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} else {
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return fmt.Errorf("unknown bucket type '%s'", bucketFactory.Type)
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}
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switch bucketFactory.ScopeType.Scope {
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case types.Undefined:
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bucketFactory.ScopeType.Scope = types.Ip
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case types.Ip:
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case types.Range:
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var (
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runTimeFilter *vm.Program
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err error
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)
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if bucketFactory.ScopeType.Filter != "" {
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if runTimeFilter, err = expr.Compile(bucketFactory.ScopeType.Filter, exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...); err != nil {
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return fmt.Errorf("Error compiling the scope filter: %s", err)
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}
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bucketFactory.ScopeType.RunTimeFilter = runTimeFilter
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}
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default:
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//Compile the scope filter
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var (
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runTimeFilter *vm.Program
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err error
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)
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if bucketFactory.ScopeType.Filter != "" {
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if runTimeFilter, err = expr.Compile(bucketFactory.ScopeType.Filter, exprhelpers.GetExprOptions(map[string]interface{}{"evt": &types.Event{}})...); err != nil {
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return fmt.Errorf("Error compiling the scope filter: %s", err)
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}
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bucketFactory.ScopeType.RunTimeFilter = runTimeFilter
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}
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}
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return nil
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}
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func LoadBuckets(cscfg *csconfig.CrowdsecServiceCfg, hub *cwhub.Hub, files []string, tomb *tomb.Tomb, buckets *Buckets, orderEvent bool) ([]BucketFactory, chan types.Event, error) {
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var (
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ret = []BucketFactory{}
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response chan types.Event
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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") && !strings.HasSuffix(f, ".yml") {
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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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defer bucketConfigurationFile.Close()
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dec := yaml.NewDecoder(bucketConfigurationFile)
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dec.SetStrict(true)
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for {
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bucketFactory := BucketFactory{}
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err = dec.Decode(&bucketFactory)
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if err != nil {
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if !errors.Is(err, io.EOF) {
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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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log.Tracef("End of yaml file")
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break
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}
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bucketFactory.DataDir = hub.GetDataDir()
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//check empty
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if bucketFactory.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 bucketFactory.FormatVersion == "" {
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log.Tracef("no version in %s : %s, assuming '1.0'", bucketFactory.Name, f)
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bucketFactory.FormatVersion = "1.0"
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}
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ok, err := cwversion.Satisfies(bucketFactory.FormatVersion, cwversion.Constraint_scenario)
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if err != nil {
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return nil, nil, fmt.Errorf("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", bucketFactory.Name, bucketFactory.FormatVersion, cwversion.Constraint_scenario)
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continue
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}
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bucketFactory.Filename = filepath.Clean(f)
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bucketFactory.BucketName = seed.Generate()
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bucketFactory.ret = response
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hubItem, err := hub.GetItemByPath(cwhub.SCENARIOS, bucketFactory.Filename)
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if err != nil {
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log.Errorf("scenario %s (%s) couldn't be find in hub (ignore if in unit tests)", bucketFactory.Name, bucketFactory.Filename)
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} else {
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if cscfg.SimulationConfig != nil {
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bucketFactory.Simulated = cscfg.SimulationConfig.IsSimulated(hubItem.Name)
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}
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if hubItem != nil {
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bucketFactory.ScenarioVersion = hubItem.State.LocalVersion
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bucketFactory.hash = hubItem.State.LocalHash
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} else {
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log.Errorf("scenario %s (%s) couldn't be find in hub (ignore if in unit tests)", bucketFactory.Name, bucketFactory.Filename)
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}
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}
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bucketFactory.wgDumpState = buckets.wgDumpState
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bucketFactory.wgPour = buckets.wgPour
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err = LoadBucket(&bucketFactory, tomb)
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if err != nil {
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log.Errorf("Failed to load bucket %s : %v", bucketFactory.Name, err)
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return nil, nil, fmt.Errorf("loading of %s failed : %v", bucketFactory.Name, err)
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}
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bucketFactory.orderEvent = orderEvent
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ret = append(ret, bucketFactory)
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}
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}
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if err := alertcontext.NewAlertContext(cscfg.ContextToSend, cscfg.ConsoleContextValueLength); err != nil {
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return nil, nil, fmt.Errorf("unable to load alert context: %s", err)
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}
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log.Infof("Loaded %d scenarios", len(ret))
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return ret, response, 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 LoadBucket(bucketFactory *BucketFactory, tomb *tomb.Tomb) error {
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var err error
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if bucketFactory.Debug {
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var clog = log.New()
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if err := types.ConfigureLogger(clog); err != nil {
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log.Fatalf("While creating bucket-specific logger : %s", err)
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}
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clog.SetLevel(log.DebugLevel)
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bucketFactory.logger = clog.WithFields(log.Fields{
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"cfg": bucketFactory.BucketName,
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"name": bucketFactory.Name,
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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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bucketFactory.logger = log.WithFields(log.Fields{
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"cfg": bucketFactory.BucketName,
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"name": bucketFactory.Name,
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})
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}
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if bucketFactory.LeakSpeed != "" {
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if bucketFactory.leakspeed, err = time.ParseDuration(bucketFactory.LeakSpeed); err != nil {
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return fmt.Errorf("bad leakspeed '%s' in %s : %v", bucketFactory.LeakSpeed, bucketFactory.Filename, err)
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}
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} else {
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bucketFactory.leakspeed = time.Duration(0)
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}
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if bucketFactory.Duration != "" {
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if bucketFactory.duration, err = time.ParseDuration(bucketFactory.Duration); err != nil {
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return fmt.Errorf("invalid Duration '%s' in %s : %v", bucketFactory.Duration, bucketFactory.Filename, err)
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}
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}
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if bucketFactory.Filter == "" {
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bucketFactory.logger.Warning("Bucket without filter, abort.")
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return fmt.Errorf("bucket without filter directive")
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}
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bucketFactory.RunTimeFilter, err = expr.Compile(bucketFactory.Filter, exprhelpers.GetExprOptions(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", bucketFactory.Filter, bucketFactory.Filename, err)
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}
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if bucketFactory.GroupBy != "" {
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bucketFactory.RunTimeGroupBy, err = expr.Compile(bucketFactory.GroupBy, exprhelpers.GetExprOptions(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", bucketFactory.GroupBy, bucketFactory.Filename, err)
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}
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}
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bucketFactory.logger.Infof("Adding %s bucket", bucketFactory.Type)
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//return the Holder corresponding to the type of bucket
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bucketFactory.processors = []Processor{}
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switch bucketFactory.Type {
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case "leaky":
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bucketFactory.processors = append(bucketFactory.processors, &DumbProcessor{})
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case "trigger":
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bucketFactory.processors = append(bucketFactory.processors, &Trigger{})
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case "counter":
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bucketFactory.processors = append(bucketFactory.processors, &DumbProcessor{})
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case "conditional":
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bucketFactory.processors = append(bucketFactory.processors, &DumbProcessor{})
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case "bayesian":
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bucketFactory.processors = append(bucketFactory.processors, &DumbProcessor{})
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default:
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return fmt.Errorf("invalid type '%s' in %s : %v", bucketFactory.Type, bucketFactory.Filename, err)
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}
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if bucketFactory.Distinct != "" {
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bucketFactory.logger.Tracef("Adding a non duplicate filter")
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bucketFactory.processors = append(bucketFactory.processors, &Uniq{})
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}
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if bucketFactory.CancelOnFilter != "" {
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bucketFactory.logger.Tracef("Adding a cancel_on filter")
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bucketFactory.processors = append(bucketFactory.processors, &CancelOnFilter{})
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}
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if bucketFactory.OverflowFilter != "" {
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bucketFactory.logger.Tracef("Adding an overflow filter")
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filovflw, err := NewOverflowFilter(bucketFactory)
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if err != nil {
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bucketFactory.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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bucketFactory.processors = append(bucketFactory.processors, filovflw)
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}
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if bucketFactory.Blackhole != "" {
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bucketFactory.logger.Tracef("Adding blackhole.")
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blackhole, err := NewBlackhole(bucketFactory)
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if err != nil {
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bucketFactory.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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bucketFactory.processors = append(bucketFactory.processors, blackhole)
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}
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if bucketFactory.ConditionalOverflow != "" {
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bucketFactory.logger.Tracef("Adding conditional overflow")
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bucketFactory.processors = append(bucketFactory.processors, &ConditionalOverflow{})
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}
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if bucketFactory.BayesianThreshold != 0 {
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bucketFactory.logger.Tracef("Adding bayesian processor")
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bucketFactory.processors = append(bucketFactory.processors, &BayesianBucket{})
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}
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if len(bucketFactory.Data) > 0 {
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for _, data := range bucketFactory.Data {
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if data.DestPath == "" {
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bucketFactory.logger.Errorf("no dest_file provided for '%s'", bucketFactory.Name)
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continue
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}
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err = exprhelpers.FileInit(bucketFactory.DataDir, data.DestPath, data.Type)
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if err != nil {
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bucketFactory.logger.Errorf("unable to init data for file '%s': %s", data.DestPath, err)
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}
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if data.Type == "regexp" { //cache only makes sense for regexp
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exprhelpers.RegexpCacheInit(data.DestPath, *data)
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}
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}
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}
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bucketFactory.output = false
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if err := ValidateFactory(bucketFactory); err != nil {
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return fmt.Errorf("invalid bucket from %s : %v", bucketFactory.Filename, err)
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}
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bucketFactory.tomb = tomb
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return nil
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}
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func LoadBucketsState(file string, buckets *Buckets, bucketFactories []BucketFactory) error {
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var state map[string]Leaky
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body, err := os.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 bucketFactories {
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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 == types.TIMEMACHINE {
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tbucket = NewTimeMachine(h)
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} else if v.Mode == types.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.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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h.tomb.Go(func() error {
|
|
return LeakRoutine(tbucket)
|
|
})
|
|
<-tbucket.Signal
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
if !found {
|
|
log.Fatalf("Unable to find holder for bucket %s : %s", k, spew.Sdump(v))
|
|
}
|
|
}
|
|
|
|
log.Infof("Restored %d buckets from dump", len(state))
|
|
return nil
|
|
|
|
}
|