136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
package parser
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/*
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This file contains
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- the runtime definition of parser
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- the compilation/parsing routines of parser configuration
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*/
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import (
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"errors"
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"fmt"
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"io"
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_ "net/http/pprof"
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"os"
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"sort"
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"strings"
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"time"
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"github.com/goombaio/namegenerator"
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log "github.com/sirupsen/logrus"
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yaml "gopkg.in/yaml.v2"
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"github.com/crowdsecurity/crowdsec/pkg/cwversion"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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)
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var seed namegenerator.Generator = namegenerator.NewNameGenerator(time.Now().UTC().UnixNano())
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/*
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identify generic component to alter maps, smartfilters ? (static, conditional static etc.)
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*/
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type Stagefile struct {
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Filename string `yaml:"filename"`
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Stage string `yaml:"stage"`
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}
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func LoadStages(stageFiles []Stagefile, pctx *UnixParserCtx, ectx EnricherCtx) ([]Node, error) {
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var nodes []Node
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tmpstages := make(map[string]bool)
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pctx.Stages = []string{}
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for _, stageFile := range stageFiles {
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if !strings.HasSuffix(stageFile.Filename, ".yaml") && !strings.HasSuffix(stageFile.Filename, ".yml") {
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log.Warningf("skip non yaml : %s", stageFile.Filename)
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continue
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}
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log.Debugf("loading parser file '%s'", stageFile)
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st, err := os.Stat(stageFile.Filename)
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if err != nil {
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return nil, fmt.Errorf("failed to stat %s : %v", stageFile, err)
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}
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if st.IsDir() {
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continue
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}
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yamlFile, err := os.Open(stageFile.Filename)
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if err != nil {
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return nil, fmt.Errorf("can't access parsing configuration file %s : %s", stageFile.Filename, err)
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}
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defer yamlFile.Close()
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//process the yaml
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dec := yaml.NewDecoder(yamlFile)
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dec.SetStrict(true)
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nodesCount := 0
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for {
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node := Node{}
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node.OnSuccess = "continue" //default behavior is to continue
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err = dec.Decode(&node)
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if err != nil {
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if errors.Is(err, io.EOF) {
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log.Tracef("End of yaml file")
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break
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}
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return nil, fmt.Errorf("error decoding parsing configuration file '%s': %v", stageFile.Filename, err)
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}
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//check for empty bucket
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if node.Name == "" && node.Description == "" && node.Author == "" {
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log.Infof("Node in %s has no name, author or description. Skipping.", stageFile.Filename)
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continue
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}
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//check compat
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if node.FormatVersion == "" {
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log.Tracef("no version in %s, assuming '1.0'", node.Name)
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node.FormatVersion = "1.0"
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}
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ok, err := cwversion.Satisfies(node.FormatVersion, cwversion.Constraint_parser)
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if err != nil {
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return 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("%s : %s doesn't satisfy parser format %s, skip", node.Name, node.FormatVersion, cwversion.Constraint_parser)
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continue
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}
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node.Stage = stageFile.Stage
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if _, ok := tmpstages[stageFile.Stage]; !ok {
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tmpstages[stageFile.Stage] = true
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}
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//compile the node : grok pattern and expression
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err = node.compile(pctx, ectx)
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if err != nil {
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if node.Name != "" {
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return nil, fmt.Errorf("failed to compile node '%s' in '%s' : %s", node.Name, stageFile.Filename, err)
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}
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return nil, fmt.Errorf("failed to compile node in '%s' : %s", stageFile.Filename, err)
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}
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/* if the stage is empty, the node is empty, it's a trailing entry in users yaml file */
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if node.Stage == "" {
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continue
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}
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for _, data := range node.Data {
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err = exprhelpers.FileInit(pctx.DataFolder, data.DestPath, data.Type)
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if err != nil {
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log.Error(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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nodes = append(nodes, node)
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nodesCount++
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}
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log.WithFields(log.Fields{"file": stageFile.Filename, "stage": stageFile.Stage}).Infof("Loaded %d parser nodes", nodesCount)
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}
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for k := range tmpstages {
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pctx.Stages = append(pctx.Stages, k)
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}
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sort.Strings(pctx.Stages)
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log.Infof("Loaded %d nodes from %d stages", len(nodes), len(pctx.Stages))
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return nodes, nil
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}
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