mirror of
https://github.com/crowdsecurity/crowdsec.git
synced 2025-05-11 12:25:53 +02:00
395 lines
10 KiB
Go
395 lines
10 KiB
Go
package clilapi
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import (
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"errors"
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"fmt"
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"slices"
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"sort"
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"strings"
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log "github.com/sirupsen/logrus"
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"github.com/spf13/cobra"
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"gopkg.in/yaml.v3"
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"github.com/crowdsecurity/crowdsec/cmd/crowdsec-cli/require"
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"github.com/crowdsecurity/crowdsec/pkg/alertcontext"
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"github.com/crowdsecurity/crowdsec/pkg/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/parser"
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)
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func (cli *cliLapi) addContext(key string, values []string) error {
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cfg := cli.cfg()
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if err := alertcontext.ValidateContextExpr(key, values); err != nil {
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return fmt.Errorf("invalid context configuration: %w", err)
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}
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if _, ok := cfg.Crowdsec.ContextToSend[key]; !ok {
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cfg.Crowdsec.ContextToSend[key] = make([]string, 0)
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log.Infof("key '%s' added", key)
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}
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data := cfg.Crowdsec.ContextToSend[key]
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for _, val := range values {
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if !slices.Contains(data, val) {
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log.Infof("value '%s' added to key '%s'", val, key)
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data = append(data, val)
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}
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cfg.Crowdsec.ContextToSend[key] = data
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}
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return cfg.Crowdsec.DumpContextConfigFile()
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}
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func (cli *cliLapi) newContextAddCmd() *cobra.Command {
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var (
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keyToAdd string
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valuesToAdd []string
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)
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cmd := &cobra.Command{
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Use: "add",
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Short: "Add context to send with alerts. You must specify the output key with the expr value you want",
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Example: `cscli lapi context add --key source_ip --value evt.Meta.source_ip
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cscli lapi context add --key file_source --value evt.Line.Src
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cscli lapi context add --value evt.Meta.source_ip --value evt.Meta.target_user
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`,
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DisableAutoGenTag: true,
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RunE: func(_ *cobra.Command, _ []string) error {
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hub, err := require.Hub(cli.cfg(), nil)
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if err != nil {
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return err
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}
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if err = alertcontext.LoadConsoleContext(cli.cfg(), hub); err != nil {
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return fmt.Errorf("while loading context: %w", err)
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}
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if keyToAdd != "" {
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return cli.addContext(keyToAdd, valuesToAdd)
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}
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for _, v := range valuesToAdd {
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keySlice := strings.Split(v, ".")
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key := keySlice[len(keySlice)-1]
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value := []string{v}
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if err := cli.addContext(key, value); err != nil {
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return err
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}
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}
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return nil
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},
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}
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flags := cmd.Flags()
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flags.StringVarP(&keyToAdd, "key", "k", "", "The key of the different values to send")
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flags.StringSliceVar(&valuesToAdd, "value", []string{}, "The expr fields to associate with the key")
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_ = cmd.MarkFlagRequired("value")
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return cmd
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}
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func (cli *cliLapi) newContextStatusCmd() *cobra.Command {
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cmd := &cobra.Command{
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Use: "status",
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Short: "List context to send with alerts",
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DisableAutoGenTag: true,
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RunE: func(_ *cobra.Command, _ []string) error {
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cfg := cli.cfg()
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hub, err := require.Hub(cfg, nil)
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if err != nil {
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return err
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}
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if err = alertcontext.LoadConsoleContext(cfg, hub); err != nil {
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return fmt.Errorf("while loading context: %w", err)
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}
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if len(cfg.Crowdsec.ContextToSend) == 0 {
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fmt.Println("No context found on this agent. You can use 'cscli lapi context add' to add context to your alerts.")
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return nil
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}
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dump, err := yaml.Marshal(cfg.Crowdsec.ContextToSend)
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if err != nil {
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return fmt.Errorf("unable to show context status: %w", err)
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}
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fmt.Print(string(dump))
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return nil
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},
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}
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return cmd
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}
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func (cli *cliLapi) newContextDetectCmd() *cobra.Command {
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var detectAll bool
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cmd := &cobra.Command{
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Use: "detect",
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Short: "Detect available fields from the installed parsers",
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Example: `cscli lapi context detect --all
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cscli lapi context detect crowdsecurity/sshd-logs
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`,
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DisableAutoGenTag: true,
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RunE: func(cmd *cobra.Command, args []string) error {
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cfg := cli.cfg()
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if !detectAll && len(args) == 0 {
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_ = cmd.Help()
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return errors.New("please provide parsers to detect or --all flag")
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}
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// to avoid all the log.Info from the loaders functions
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log.SetLevel(log.WarnLevel)
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if err := exprhelpers.Init(nil); err != nil {
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return fmt.Errorf("failed to init expr helpers: %w", err)
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}
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hub, err := require.Hub(cfg, nil)
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if err != nil {
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return err
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}
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csParsers := parser.NewParsers(hub)
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if csParsers, err = parser.LoadParsers(cfg, csParsers); err != nil {
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return fmt.Errorf("unable to load parsers: %w", err)
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}
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fieldByParsers := make(map[string][]string)
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for _, node := range csParsers.Nodes {
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if !detectAll && !slices.Contains(args, node.Name) {
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continue
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}
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if !detectAll {
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args = removeFromSlice(node.Name, args)
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}
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fieldByParsers[node.Name] = make([]string, 0)
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fieldByParsers[node.Name] = detectNode(node, *csParsers.Ctx)
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subNodeFields := detectSubNode(node, *csParsers.Ctx)
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for _, field := range subNodeFields {
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if !slices.Contains(fieldByParsers[node.Name], field) {
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fieldByParsers[node.Name] = append(fieldByParsers[node.Name], field)
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}
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}
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}
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fmt.Printf("Acquisition :\n\n")
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fmt.Printf(" - evt.Line.Module\n")
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fmt.Printf(" - evt.Line.Raw\n")
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fmt.Printf(" - evt.Line.Src\n")
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fmt.Println()
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parsersKey := make([]string, 0)
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for k := range fieldByParsers {
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parsersKey = append(parsersKey, k)
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}
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sort.Strings(parsersKey)
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for _, k := range parsersKey {
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if len(fieldByParsers[k]) == 0 {
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continue
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}
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fmt.Printf("%s :\n\n", k)
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values := fieldByParsers[k]
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sort.Strings(values)
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for _, value := range values {
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fmt.Printf(" - %s\n", value)
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}
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fmt.Println()
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}
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if len(args) > 0 {
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for _, parserNotFound := range args {
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log.Errorf("parser '%s' not found, can't detect fields", parserNotFound)
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}
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}
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return nil
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},
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}
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cmd.Flags().BoolVarP(&detectAll, "all", "a", false, "Detect evt field for all installed parser")
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return cmd
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}
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func (cli *cliLapi) newContextDeleteCmd() *cobra.Command {
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cmd := &cobra.Command{
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Use: "delete",
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DisableAutoGenTag: true,
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RunE: func(_ *cobra.Command, _ []string) error {
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filePath := cli.cfg().Crowdsec.ConsoleContextPath
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if filePath == "" {
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filePath = "the context file"
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}
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return fmt.Errorf("command 'delete' has been removed, please manually edit %s", filePath)
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},
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}
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return cmd
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}
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func (cli *cliLapi) newContextCmd() *cobra.Command {
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cmd := &cobra.Command{
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Use: "context [command]",
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Short: "Manage context to send with alerts",
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DisableAutoGenTag: true,
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PersistentPreRunE: func(_ *cobra.Command, _ []string) error {
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cfg := cli.cfg()
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if err := cfg.LoadCrowdsec(); err != nil {
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fileNotFoundMessage := fmt.Sprintf("failed to open context file: open %s: no such file or directory", cfg.Crowdsec.ConsoleContextPath)
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if err.Error() != fileNotFoundMessage {
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return fmt.Errorf("unable to load CrowdSec agent configuration: %w", err)
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}
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}
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if cfg.DisableAgent {
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return errors.New("agent is disabled and lapi context can only be used on the agent")
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}
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return nil
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},
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}
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cmd.AddCommand(cli.newContextAddCmd())
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cmd.AddCommand(cli.newContextStatusCmd())
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cmd.AddCommand(cli.newContextDetectCmd())
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cmd.AddCommand(cli.newContextDeleteCmd())
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return cmd
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}
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func detectStaticField(grokStatics []parser.ExtraField) []string {
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ret := make([]string, 0)
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for _, static := range grokStatics {
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if static.Parsed != "" {
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fieldName := "evt.Parsed." + static.Parsed
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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if static.Meta != "" {
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fieldName := "evt.Meta." + static.Meta
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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if static.TargetByName != "" {
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fieldName := static.TargetByName
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if !strings.HasPrefix(fieldName, "evt.") {
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fieldName = "evt." + fieldName
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}
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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}
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return ret
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}
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func detectNode(node parser.Node, parserCTX parser.UnixParserCtx) []string {
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ret := make([]string, 0)
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if node.Grok.RunTimeRegexp != nil {
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for _, capturedField := range node.Grok.RunTimeRegexp.Names() {
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fieldName := "evt.Parsed." + capturedField
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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}
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if node.Grok.RegexpName != "" {
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grokCompiled, err := parserCTX.Grok.Get(node.Grok.RegexpName)
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// ignore error (parser does not exist?)
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if err == nil {
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for _, capturedField := range grokCompiled.Names() {
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fieldName := "evt.Parsed." + capturedField
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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}
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}
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if len(node.Grok.Statics) > 0 {
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staticsField := detectStaticField(node.Grok.Statics)
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for _, staticField := range staticsField {
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if !slices.Contains(ret, staticField) {
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ret = append(ret, staticField)
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}
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}
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}
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if len(node.Statics) > 0 {
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staticsField := detectStaticField(node.Statics)
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for _, staticField := range staticsField {
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if !slices.Contains(ret, staticField) {
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ret = append(ret, staticField)
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}
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}
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}
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return ret
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}
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func detectSubNode(node parser.Node, parserCTX parser.UnixParserCtx) []string {
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ret := make([]string, 0)
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for _, subnode := range node.LeavesNodes {
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if subnode.Grok.RunTimeRegexp != nil {
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for _, capturedField := range subnode.Grok.RunTimeRegexp.Names() {
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fieldName := "evt.Parsed." + capturedField
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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}
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if subnode.Grok.RegexpName != "" {
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grokCompiled, err := parserCTX.Grok.Get(subnode.Grok.RegexpName)
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if err == nil {
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// ignore error (parser does not exist?)
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for _, capturedField := range grokCompiled.Names() {
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fieldName := "evt.Parsed." + capturedField
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if !slices.Contains(ret, fieldName) {
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ret = append(ret, fieldName)
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}
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}
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}
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}
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if len(subnode.Grok.Statics) > 0 {
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staticsField := detectStaticField(subnode.Grok.Statics)
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for _, staticField := range staticsField {
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if !slices.Contains(ret, staticField) {
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ret = append(ret, staticField)
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}
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}
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}
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if len(subnode.Statics) > 0 {
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staticsField := detectStaticField(subnode.Statics)
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for _, staticField := range staticsField {
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if !slices.Contains(ret, staticField) {
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ret = append(ret, staticField)
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}
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}
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}
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}
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return ret
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}
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