633 lines
16 KiB
Go
633 lines
16 KiB
Go
package main
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import (
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"context"
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"errors"
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"fmt"
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"net/url"
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"os"
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"slices"
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"sort"
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"strings"
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"github.com/go-openapi/strfmt"
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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/go-cs-lib/version"
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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/apiclient"
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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/exprhelpers"
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"github.com/crowdsecurity/crowdsec/pkg/models"
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"github.com/crowdsecurity/crowdsec/pkg/parser"
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)
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const LAPIURLPrefix = "v1"
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type cliLapi struct {
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cfg configGetter
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}
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func NewCLILapi(cfg configGetter) *cliLapi {
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return &cliLapi{
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cfg: cfg,
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}
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}
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func (cli *cliLapi) status() error {
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cfg := cli.cfg()
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password := strfmt.Password(cfg.API.Client.Credentials.Password)
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login := cfg.API.Client.Credentials.Login
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origURL := cfg.API.Client.Credentials.URL
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apiURL, err := url.Parse(origURL)
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if err != nil {
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return fmt.Errorf("parsing api url: %w", err)
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}
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hub, err := require.Hub(cfg, nil, nil)
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if err != nil {
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return err
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}
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scenarios, err := hub.GetInstalledNamesByType(cwhub.SCENARIOS)
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if err != nil {
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return fmt.Errorf("failed to get scenarios: %w", err)
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}
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Client, err = apiclient.NewDefaultClient(apiURL,
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LAPIURLPrefix,
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fmt.Sprintf("crowdsec/%s", version.String()),
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nil)
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if err != nil {
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return fmt.Errorf("init default client: %w", err)
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}
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t := models.WatcherAuthRequest{
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MachineID: &login,
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Password: &password,
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Scenarios: scenarios,
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}
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log.Infof("Loaded credentials from %s", cfg.API.Client.CredentialsFilePath)
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// use the original string because apiURL would print 'http://unix/'
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log.Infof("Trying to authenticate with username %s on %s", login, origURL)
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_, _, err = Client.Auth.AuthenticateWatcher(context.Background(), t)
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if err != nil {
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return fmt.Errorf("failed to authenticate to Local API (LAPI): %w", err)
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}
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log.Infof("You can successfully interact with Local API (LAPI)")
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return nil
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}
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func (cli *cliLapi) register(apiURL string, outputFile string, machine string) error {
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var err error
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lapiUser := machine
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cfg := cli.cfg()
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if lapiUser == "" {
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lapiUser, err = generateID("")
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if err != nil {
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return fmt.Errorf("unable to generate machine id: %w", err)
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}
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}
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password := strfmt.Password(generatePassword(passwordLength))
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apiurl, err := prepareAPIURL(cfg.API.Client, apiURL)
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if err != nil {
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return fmt.Errorf("parsing api url: %w", err)
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}
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_, err = apiclient.RegisterClient(&apiclient.Config{
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MachineID: lapiUser,
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Password: password,
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UserAgent: fmt.Sprintf("crowdsec/%s", version.String()),
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URL: apiurl,
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VersionPrefix: LAPIURLPrefix,
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}, nil)
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if err != nil {
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return fmt.Errorf("api client register: %w", err)
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}
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log.Printf("Successfully registered to Local API (LAPI)")
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var dumpFile string
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if outputFile != "" {
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dumpFile = outputFile
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} else if cfg.API.Client.CredentialsFilePath != "" {
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dumpFile = cfg.API.Client.CredentialsFilePath
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} else {
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dumpFile = ""
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}
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apiCfg := csconfig.ApiCredentialsCfg{
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Login: lapiUser,
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Password: password.String(),
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URL: apiURL,
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}
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apiConfigDump, err := yaml.Marshal(apiCfg)
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if err != nil {
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return fmt.Errorf("unable to marshal api credentials: %w", err)
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}
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if dumpFile != "" {
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err = os.WriteFile(dumpFile, apiConfigDump, 0o600)
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if err != nil {
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return fmt.Errorf("write api credentials to '%s' failed: %w", dumpFile, err)
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}
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log.Printf("Local API credentials written to '%s'", dumpFile)
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} else {
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fmt.Printf("%s\n", string(apiConfigDump))
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}
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log.Warning(ReloadMessage())
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return nil
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}
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// prepareAPIURL checks/fixes a LAPI connection url (http, https or socket) and returns an URL struct
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func prepareAPIURL(clientCfg *csconfig.LocalApiClientCfg, apiURL string) (*url.URL, error) {
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if apiURL == "" {
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if clientCfg == nil || clientCfg.Credentials == nil || clientCfg.Credentials.URL == "" {
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return nil, errors.New("no Local API URL. Please provide it in your configuration or with the -u parameter")
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}
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apiURL = clientCfg.Credentials.URL
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}
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// URL needs to end with /, but user doesn't care
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if !strings.HasSuffix(apiURL, "/") {
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apiURL += "/"
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}
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// URL needs to start with http://, but user doesn't care
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if !strings.HasPrefix(apiURL, "http://") && !strings.HasPrefix(apiURL, "https://") && !strings.HasPrefix(apiURL, "/") {
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apiURL = "http://" + apiURL
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}
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return url.Parse(apiURL)
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}
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func (cli *cliLapi) newStatusCmd() *cobra.Command {
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cmdLapiStatus := &cobra.Command{
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Use: "status",
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Short: "Check authentication to Local API (LAPI)",
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Args: cobra.MinimumNArgs(0),
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DisableAutoGenTag: true,
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RunE: func(_ *cobra.Command, _ []string) error {
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return cli.status()
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},
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}
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return cmdLapiStatus
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}
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func (cli *cliLapi) newRegisterCmd() *cobra.Command {
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var (
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apiURL string
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outputFile string
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machine string
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)
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cmd := &cobra.Command{
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Use: "register",
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Short: "Register a machine to Local API (LAPI)",
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Long: `Register your machine to the Local API (LAPI).
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Keep in mind the machine needs to be validated by an administrator on LAPI side to be effective.`,
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Args: cobra.MinimumNArgs(0),
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DisableAutoGenTag: true,
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RunE: func(_ *cobra.Command, _ []string) error {
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return cli.register(apiURL, outputFile, machine)
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},
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}
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flags := cmd.Flags()
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flags.StringVarP(&apiURL, "url", "u", "", "URL of the API (ie. http://127.0.0.1)")
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flags.StringVarP(&outputFile, "file", "f", "", "output file destination")
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flags.StringVar(&machine, "machine", "", "Name of the machine to register with")
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return cmd
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}
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func (cli *cliLapi) NewCommand() *cobra.Command {
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cmd := &cobra.Command{
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Use: "lapi [action]",
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Short: "Manage interaction with Local API (LAPI)",
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Args: cobra.MinimumNArgs(1),
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DisableAutoGenTag: true,
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PersistentPreRunE: func(_ *cobra.Command, _ []string) error {
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if err := cli.cfg().LoadAPIClient(); err != nil {
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return fmt.Errorf("loading api client: %w", err)
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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.newRegisterCmd())
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cmd.AddCommand(cli.newStatusCmd())
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cmd.AddCommand(cli.newContextCmd())
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return cmd
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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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if err := cfg.Crowdsec.DumpContextConfigFile(); err != nil {
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return err
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}
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return nil
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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, 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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if err := cli.addContext(keyToAdd, valuesToAdd); err != nil {
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return err
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}
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return nil
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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, 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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log.Infof("Please provide parsers to detect or --all flag.")
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printHelp(cmd)
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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, 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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fmt.Printf("Command 'delete' is deprecated, please manually edit %s.", filePath)
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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) 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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Run: func(cmd *cobra.Command, _ []string) {
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printHelp(cmd)
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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 := fmt.Sprintf("evt.Parsed.%s", 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 := fmt.Sprintf("evt.Meta.%s", 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 {
|
|
for _, capturedField := range node.Grok.RunTimeRegexp.Names() {
|
|
fieldName := fmt.Sprintf("evt.Parsed.%s", capturedField)
|
|
if !slices.Contains(ret, fieldName) {
|
|
ret = append(ret, fieldName)
|
|
}
|
|
}
|
|
}
|
|
|
|
if node.Grok.RegexpName != "" {
|
|
grokCompiled, err := parserCTX.Grok.Get(node.Grok.RegexpName)
|
|
// ignore error (parser does not exist?)
|
|
if err == nil {
|
|
for _, capturedField := range grokCompiled.Names() {
|
|
fieldName := fmt.Sprintf("evt.Parsed.%s", capturedField)
|
|
if !slices.Contains(ret, fieldName) {
|
|
ret = append(ret, fieldName)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(node.Grok.Statics) > 0 {
|
|
staticsField := detectStaticField(node.Grok.Statics)
|
|
for _, staticField := range staticsField {
|
|
if !slices.Contains(ret, staticField) {
|
|
ret = append(ret, staticField)
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(node.Statics) > 0 {
|
|
staticsField := detectStaticField(node.Statics)
|
|
for _, staticField := range staticsField {
|
|
if !slices.Contains(ret, staticField) {
|
|
ret = append(ret, staticField)
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|
|
func detectSubNode(node parser.Node, parserCTX parser.UnixParserCtx) []string {
|
|
ret := make([]string, 0)
|
|
|
|
for _, subnode := range node.LeavesNodes {
|
|
if subnode.Grok.RunTimeRegexp != nil {
|
|
for _, capturedField := range subnode.Grok.RunTimeRegexp.Names() {
|
|
fieldName := fmt.Sprintf("evt.Parsed.%s", capturedField)
|
|
if !slices.Contains(ret, fieldName) {
|
|
ret = append(ret, fieldName)
|
|
}
|
|
}
|
|
}
|
|
|
|
if subnode.Grok.RegexpName != "" {
|
|
grokCompiled, err := parserCTX.Grok.Get(subnode.Grok.RegexpName)
|
|
if err == nil {
|
|
// ignore error (parser does not exist?)
|
|
for _, capturedField := range grokCompiled.Names() {
|
|
fieldName := fmt.Sprintf("evt.Parsed.%s", capturedField)
|
|
if !slices.Contains(ret, fieldName) {
|
|
ret = append(ret, fieldName)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(subnode.Grok.Statics) > 0 {
|
|
staticsField := detectStaticField(subnode.Grok.Statics)
|
|
for _, staticField := range staticsField {
|
|
if !slices.Contains(ret, staticField) {
|
|
ret = append(ret, staticField)
|
|
}
|
|
}
|
|
}
|
|
|
|
if len(subnode.Statics) > 0 {
|
|
staticsField := detectStaticField(subnode.Statics)
|
|
for _, staticField := range staticsField {
|
|
if !slices.Contains(ret, staticField) {
|
|
ret = append(ret, staticField)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return ret
|
|
}
|