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package main
import (
"encoding/json"
"fmt"
"io"
"os/exec"
"strconv"
"time"
log "github.com/sirupsen/logrus"
"github.com/crowdsecurity/crowdsec/pkg/models"
)
type DecisionKey struct {
Value string
Type string
}
type DecisionWithAction struct {
models.Decision
Action string `json:"action,omitempty"`
}
type customBouncer struct {
path string
binaryStdin io.Writer
feedViaStdin bool
newDecisionValueSet map[DecisionKey]struct{}
expiredDecisionValueSet map[DecisionKey]struct{}
}
func newCustomBouncer(cfg *bouncerConfig) (*customBouncer, error) {
return &customBouncer{
path: cfg.BinPath,
feedViaStdin: cfg.FeedViaStdin,
}, nil
}
func (c *customBouncer) ResetCache() {
cachedDecisionCount := len(c.newDecisionValueSet) + len(c.expiredDecisionValueSet)
if cachedDecisionCount != 0 {
log.Debugf("resetting cache, clearing %d decisions", cachedDecisionCount)
// dont return here, because this could be used to intiate the sets
}
c.newDecisionValueSet = make(map[DecisionKey]struct{})
c.expiredDecisionValueSet = make(map[DecisionKey]struct{})
}
func (c *customBouncer) Init() error {
c.ResetCache()
return nil
}
func (c *customBouncer) Add(decision *models.Decision) error {
if _, exists := c.newDecisionValueSet[decisionToDecisionKey(decision)]; exists {
return nil
}
banDuration, err := time.ParseDuration(*decision.Duration)
if err != nil {
return err
}
log.Debugf("custom [%s] : add ban on %s for %s sec (%s)", c.path, *decision.Value, strconv.Itoa(int(banDuration.Seconds())), *decision.Scenario)
var str string
if c.feedViaStdin {
str, err = serializeDecision(decision, "add")
} else {
str, err = serializeDecision(decision, "")
}
if err != nil {
log.Warningf("serialize: %s", err)
}
if c.feedViaStdin {
fmt.Fprintln(c.binaryStdin, str)
return nil
}
cmd := exec.Command(c.path, "add", *decision.Value, strconv.Itoa(int(banDuration.Seconds())), *decision.Scenario, str)
if out, err := cmd.CombinedOutput(); err != nil {
log.Errorf("Error in 'add' command (%s): %v --> %s", cmd.String(), err, string(out))
}
c.newDecisionValueSet[decisionToDecisionKey(decision)] = struct{}{}
return nil
}
func (c *customBouncer) Delete(decision *models.Decision) error {
if _, exists := c.expiredDecisionValueSet[decisionToDecisionKey(decision)]; exists {
return nil
}
banDuration, err := time.ParseDuration(*decision.Duration)
if err != nil {
return err
}
var str string
if c.feedViaStdin {
str, err = serializeDecision(decision, "del")
} else {
str, err = serializeDecision(decision, "")
}
if c.feedViaStdin {
fmt.Fprintln(c.binaryStdin, str)
return nil
}
if err != nil {
log.Warningf("serialize: %s", err)
}
log.Debugf("custom [%s] : del ban on %s for %s sec (%s)", c.path, *decision.Value, strconv.Itoa(int(banDuration.Seconds())), *decision.Scenario)
cmd := exec.Command(c.path, "del", *decision.Value, strconv.Itoa(int(banDuration.Seconds())), *decision.Scenario, str)
if out, err := cmd.CombinedOutput(); err != nil {
log.Errorf("Error in 'del' command (%s): %v --> %s", cmd.String(), err, string(out))
}
c.expiredDecisionValueSet[decisionToDecisionKey(decision)] = struct{}{}
return nil
}
func (c *customBouncer) ShutDown() error {
return nil
}
func serializeDecision(decision *models.Decision, action string) (string, error) {
d := DecisionWithAction{Decision: *decision, Action: action}
serbyte, err := json.Marshal(d)
if err != nil {
return "", fmt.Errorf("serialize error : %s", err)
}
return string(serbyte), nil
}
func decisionToDecisionKey(decision *models.Decision) DecisionKey {
return DecisionKey{
Value: *decision.Value,
Type: *decision.Type,
}
}
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