109 lines
3.6 KiB
Go
109 lines
3.6 KiB
Go
package csprofiles
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import (
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"fmt"
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"github.com/antonmedv/expr"
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"github.com/crowdsecurity/crowdsec/pkg/csconfig"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/models"
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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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func GenerateDecisionFromProfile(Profile *csconfig.ProfileCfg, Alert *models.Alert) ([]*models.Decision, error) {
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var decisions []*models.Decision
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for _, refDecision := range Profile.Decisions {
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decision := models.Decision{}
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/*the reference decision from profile is in sumulated mode */
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if refDecision.Simulated != nil && *refDecision.Simulated {
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decision.Simulated = new(bool)
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*decision.Simulated = true
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/*the event is already in simulation mode */
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} else if Alert.Simulated != nil && *Alert.Simulated {
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decision.Simulated = new(bool)
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*decision.Simulated = true
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}
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/*If the profile specifies a scope, this will prevail.
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If not, we're going to get the scope from the source itself*/
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decision.Scope = new(string)
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if refDecision.Scope != nil && *refDecision.Scope != "" {
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*decision.Scope = *refDecision.Scope
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} else {
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*decision.Scope = *Alert.Source.Scope
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}
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/*some fields are populated from the reference object : duration, scope, type*/
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decision.Duration = new(string)
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*decision.Duration = *refDecision.Duration
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decision.Type = new(string)
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*decision.Type = *refDecision.Type
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/*for the others, let's populate it from the alert and its source*/
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decision.Value = new(string)
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*decision.Value = *Alert.Source.Value
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decision.Origin = new(string)
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*decision.Origin = "crowdsec"
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if refDecision.Origin != nil {
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*decision.Origin = fmt.Sprintf("%s/%s", *decision.Origin, *refDecision.Origin)
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}
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decision.Scenario = new(string)
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*decision.Scenario = *Alert.Scenario
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decisions = append(decisions, &decision)
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}
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return decisions, nil
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}
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var clog *log.Entry
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//EvaluateProfile is going to evaluate an Alert against a profile to generate Decisions
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func EvaluateProfile(profile *csconfig.ProfileCfg, Alert *models.Alert) ([]*models.Decision, bool, error) {
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var decisions []*models.Decision
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if clog == nil {
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xlog := log.New()
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if err := types.ConfigureLogger(xlog); err != nil {
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log.Fatalf("While creating profiles-specific logger : %s", err)
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}
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xlog.SetLevel(log.TraceLevel)
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clog = xlog.WithFields(log.Fields{
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"type": "profile",
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})
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}
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matched := false
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for eIdx, expression := range profile.RuntimeFilters {
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output, err := expr.Run(expression, exprhelpers.GetExprEnv(map[string]interface{}{"Alert": Alert}))
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if err != nil {
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log.Warningf("failed to run whitelist expr : %v", err)
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return nil, matched, errors.Wrapf(err, "while running expression %s", profile.Filters[eIdx])
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}
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switch out := output.(type) {
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case bool:
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if profile.Debug != nil && *profile.Debug {
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profile.DebugFilters[eIdx].Run(clog, out, exprhelpers.GetExprEnv(map[string]interface{}{"Alert": Alert}))
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}
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if out {
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matched = true
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/*the expression matched, create the associated decision*/
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subdecisions, err := GenerateDecisionFromProfile(profile, Alert)
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if err != nil {
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return nil, matched, errors.Wrapf(err, "while generating decision from profile %s", profile.Name)
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}
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decisions = append(decisions, subdecisions...)
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} else {
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log.Debugf("Profile %s filter is unsuccessful", profile.Name)
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if profile.OnFailure == "break" {
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break
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}
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}
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default:
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return nil, matched, fmt.Errorf("unexpected type %t (%v) while running '%s'", output, output, profile.Filters[eIdx])
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}
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}
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return decisions, matched, nil
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}
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