mirror of
https://github.com/swissmakers/fail2ban-ui.git
synced 2026-04-11 13:47:05 +02:00
370 lines
11 KiB
Go
370 lines
11 KiB
Go
package fail2ban
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import (
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"context"
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"errors"
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"fmt"
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"os/exec"
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"sort"
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"strings"
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"sync"
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"time"
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"github.com/swissmakers/fail2ban-ui/internal/config"
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)
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// LocalConnector interacts with a local fail2ban instance via fail2ban-client CLI.
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type LocalConnector struct {
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server config.Fail2banServer
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}
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// NewLocalConnector creates a new LocalConnector instance.
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func NewLocalConnector(server config.Fail2banServer) *LocalConnector {
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return &LocalConnector{server: server}
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}
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// ID implements Connector.
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func (lc *LocalConnector) ID() string {
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return lc.server.ID
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}
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// Server implements Connector.
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func (lc *LocalConnector) Server() config.Fail2banServer {
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return lc.server
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}
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// GetJailInfos implements Connector.
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func (lc *LocalConnector) GetJailInfos(ctx context.Context) ([]JailInfo, error) {
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jails, err := lc.getJails(ctx)
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if err != nil {
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return nil, err
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}
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logPath := lc.server.LogPath
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if logPath == "" {
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logPath = "/var/log/fail2ban.log"
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}
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banHistory, err := ParseBanLog(logPath)
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if err != nil {
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banHistory = make(map[string][]BanEvent)
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}
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oneHourAgo := time.Now().Add(-1 * time.Hour)
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// Use parallel execution for better performance
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type jailResult struct {
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jail JailInfo
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err error
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}
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results := make(chan jailResult, len(jails))
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var wg sync.WaitGroup
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for _, jail := range jails {
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wg.Add(1)
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go func(j string) {
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defer wg.Done()
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bannedIPs, err := lc.GetBannedIPs(ctx, j)
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if err != nil {
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results <- jailResult{err: err}
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return
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}
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newInLastHour := 0
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if events, ok := banHistory[j]; ok {
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for _, e := range events {
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if e.Time.After(oneHourAgo) {
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newInLastHour++
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}
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}
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}
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results <- jailResult{
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jail: JailInfo{
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JailName: j,
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TotalBanned: len(bannedIPs),
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NewInLastHour: newInLastHour,
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BannedIPs: bannedIPs,
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Enabled: true,
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},
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}
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}(jail)
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}
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go func() {
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wg.Wait()
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close(results)
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}()
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var finalResults []JailInfo
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for result := range results {
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if result.err != nil {
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continue
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}
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finalResults = append(finalResults, result.jail)
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}
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sort.SliceStable(finalResults, func(i, j int) bool {
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return finalResults[i].JailName < finalResults[j].JailName
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})
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return finalResults, nil
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}
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// GetBannedIPs implements Connector.
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func (lc *LocalConnector) GetBannedIPs(ctx context.Context, jail string) ([]string, error) {
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args := []string{"status", jail}
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out, err := lc.runFail2banClient(ctx, args...)
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if err != nil {
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return nil, fmt.Errorf("fail2ban-client status %s failed: %w", jail, err)
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}
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var bannedIPs []string
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lines := strings.Split(out, "\n")
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for _, line := range lines {
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if strings.Contains(line, "IP list:") {
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parts := strings.Split(line, ":")
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if len(parts) > 1 {
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ips := strings.Fields(strings.TrimSpace(parts[1]))
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bannedIPs = append(bannedIPs, ips...)
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}
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break
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}
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}
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return bannedIPs, nil
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}
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// UnbanIP implements Connector.
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func (lc *LocalConnector) UnbanIP(ctx context.Context, jail, ip string) error {
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args := []string{"set", jail, "unbanip", ip}
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if _, err := lc.runFail2banClient(ctx, args...); err != nil {
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return fmt.Errorf("error unbanning IP %s from jail %s: %w", ip, jail, err)
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}
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return nil
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}
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// Reload implements Connector.
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func (lc *LocalConnector) Reload(ctx context.Context) error {
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out, err := lc.runFail2banClient(ctx, "reload")
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if err != nil {
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// Include the output in the error message for better debugging
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return fmt.Errorf("fail2ban reload error: %w (output: %s)", err, strings.TrimSpace(out))
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}
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// Check if output indicates success (fail2ban-client returns "OK" on success)
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outputTrimmed := strings.TrimSpace(out)
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if outputTrimmed != "OK" && outputTrimmed != "" {
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config.DebugLog("fail2ban reload output: %s", out)
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// Check for jail errors in output even when command succeeds
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// Look for patterns like "Errors in jail 'jailname'. Skipping..."
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if strings.Contains(out, "Errors in jail") || strings.Contains(out, "Unable to read the filter") {
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// Return an error that includes the output so handler can parse it
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return fmt.Errorf("fail2ban reload completed but with errors (output: %s)", strings.TrimSpace(out))
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}
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}
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return nil
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}
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// RestartWithMode restarts (or reloads) the local Fail2ban instance and returns
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// a mode string describing what happened:
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// - "restart": systemd service was restarted and health check passed
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// - "reload": configuration was reloaded via fail2ban-client and pong check passed
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func (lc *LocalConnector) RestartWithMode(ctx context.Context) (string, error) {
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// 1) Try systemd restart if systemctl is available.
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if _, err := exec.LookPath("systemctl"); err == nil {
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cmd := "systemctl restart fail2ban"
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out, err := executeShellCommand(ctx, cmd)
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if err != nil {
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return "restart", fmt.Errorf("failed to restart fail2ban via systemd: %w - output: %s",
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err, strings.TrimSpace(out))
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}
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if err := lc.checkFail2banHealthy(ctx); err != nil {
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return "restart", fmt.Errorf("fail2ban health check after systemd restart failed: %w", err)
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}
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return "restart", nil
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}
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// 2) Fallback: no systemctl in PATH (container image without systemd, or
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// non-systemd environment). Use fail2ban-client reload + ping.
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if err := lc.Reload(ctx); err != nil {
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return "reload", fmt.Errorf("failed to reload fail2ban via fail2ban-client (systemctl not available): %w", err)
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}
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if err := lc.checkFail2banHealthy(ctx); err != nil {
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return "reload", fmt.Errorf("fail2ban health check after reload failed: %w", err)
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}
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return "reload", nil
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}
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// Restart implements Connector.
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func (lc *LocalConnector) Restart(ctx context.Context) error {
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_, err := lc.RestartWithMode(ctx)
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return err
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}
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// GetFilterConfig implements Connector.
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func (lc *LocalConnector) GetFilterConfig(ctx context.Context, jail string) (string, string, error) {
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return GetFilterConfigLocal(jail)
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}
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// SetFilterConfig implements Connector.
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func (lc *LocalConnector) SetFilterConfig(ctx context.Context, jail, content string) error {
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return SetFilterConfigLocal(jail, content)
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}
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// FetchBanEvents implements Connector.
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func (lc *LocalConnector) FetchBanEvents(ctx context.Context, limit int) ([]BanEvent, error) {
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logPath := lc.server.LogPath
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if logPath == "" {
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logPath = "/var/log/fail2ban.log"
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}
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eventsByJail, err := ParseBanLog(logPath)
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if err != nil {
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return nil, err
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}
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var all []BanEvent
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for _, evs := range eventsByJail {
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all = append(all, evs...)
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}
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sort.SliceStable(all, func(i, j int) bool {
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return all[i].Time.After(all[j].Time)
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})
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if limit > 0 && len(all) > limit {
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all = all[:limit]
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}
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return all, nil
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}
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func (lc *LocalConnector) getJails(ctx context.Context) ([]string, error) {
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out, err := lc.runFail2banClient(ctx, "status")
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if err != nil {
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return nil, fmt.Errorf("error: unable to retrieve jail information. is your fail2ban service running? details: %w", err)
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}
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var jails []string
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lines := strings.Split(out, "\n")
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for _, line := range lines {
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if strings.Contains(line, "Jail list:") {
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parts := strings.Split(line, ":")
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if len(parts) > 1 {
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raw := strings.TrimSpace(parts[1])
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jails = strings.Split(raw, ",")
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for i := range jails {
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jails[i] = strings.TrimSpace(jails[i])
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}
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}
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}
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}
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return jails, nil
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}
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func (lc *LocalConnector) runFail2banClient(ctx context.Context, args ...string) (string, error) {
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cmdArgs := lc.buildFail2banArgs(args...)
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cmd := exec.CommandContext(ctx, "fail2ban-client", cmdArgs...)
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out, err := cmd.CombinedOutput()
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return string(out), err
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}
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func (lc *LocalConnector) buildFail2banArgs(args ...string) []string {
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if lc.server.SocketPath == "" {
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return args
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}
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base := []string{"-s", lc.server.SocketPath}
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return append(base, args...)
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}
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// checkFail2banHealthy runs a quick `fail2ban-client ping` via the existing
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// runFail2banClient helper and expects a successful pong reply.
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func (lc *LocalConnector) checkFail2banHealthy(ctx context.Context) error {
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out, err := lc.runFail2banClient(ctx, "ping")
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trimmed := strings.TrimSpace(out)
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if err != nil {
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return fmt.Errorf("fail2ban ping error: %w (output: %s)", err, trimmed)
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}
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// Typical output is e.g. "Server replied: pong" – accept anything that
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// contains "pong" case-insensitively.
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if !strings.Contains(strings.ToLower(trimmed), "pong") {
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return fmt.Errorf("unexpected fail2ban ping output: %s", trimmed)
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}
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return nil
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}
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// GetAllJails implements Connector.
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func (lc *LocalConnector) GetAllJails(ctx context.Context) ([]JailInfo, error) {
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return GetAllJails()
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}
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// UpdateJailEnabledStates implements Connector.
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func (lc *LocalConnector) UpdateJailEnabledStates(ctx context.Context, updates map[string]bool) error {
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return UpdateJailEnabledStates(updates)
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}
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// GetFilters implements Connector.
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func (lc *LocalConnector) GetFilters(ctx context.Context) ([]string, error) {
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return GetFiltersLocal()
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}
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// TestFilter implements Connector.
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func (lc *LocalConnector) TestFilter(ctx context.Context, filterName string, logLines []string) (string, string, error) {
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return TestFilterLocal(filterName, logLines)
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}
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// GetJailConfig implements Connector.
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func (lc *LocalConnector) GetJailConfig(ctx context.Context, jail string) (string, string, error) {
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return GetJailConfig(jail)
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}
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// SetJailConfig implements Connector.
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func (lc *LocalConnector) SetJailConfig(ctx context.Context, jail, content string) error {
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return SetJailConfig(jail, content)
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}
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// TestLogpath implements Connector.
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func (lc *LocalConnector) TestLogpath(ctx context.Context, logpath string) ([]string, error) {
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return TestLogpath(logpath)
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}
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// TestLogpathWithResolution implements Connector.
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func (lc *LocalConnector) TestLogpathWithResolution(ctx context.Context, logpath string) (originalPath, resolvedPath string, files []string, err error) {
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return TestLogpathWithResolution(logpath)
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}
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// UpdateDefaultSettings implements Connector.
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func (lc *LocalConnector) UpdateDefaultSettings(ctx context.Context, settings config.AppSettings) error {
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return UpdateDefaultSettingsLocal(settings)
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}
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// EnsureJailLocalStructure implements Connector.
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func (lc *LocalConnector) EnsureJailLocalStructure(ctx context.Context) error {
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// Note: Migration is handled in newConnectorForServer() before
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// config.EnsureLocalFail2banAction() is called, so migration has already
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// run by the time this method is called.
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return config.EnsureJailLocalStructure()
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}
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// CreateJail implements Connector.
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func (lc *LocalConnector) CreateJail(ctx context.Context, jailName, content string) error {
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return CreateJail(jailName, content)
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}
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// DeleteJail implements Connector.
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func (lc *LocalConnector) DeleteJail(ctx context.Context, jailName string) error {
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return DeleteJail(jailName)
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}
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// CreateFilter implements Connector.
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func (lc *LocalConnector) CreateFilter(ctx context.Context, filterName, content string) error {
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return CreateFilter(filterName, content)
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}
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// DeleteFilter implements Connector.
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func (lc *LocalConnector) DeleteFilter(ctx context.Context, filterName string) error {
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return DeleteFilter(filterName)
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}
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func executeShellCommand(ctx context.Context, command string) (string, error) {
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parts := strings.Fields(command)
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if len(parts) == 0 {
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return "", errors.New("no command provided")
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}
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cmd := exec.CommandContext(ctx, parts[0], parts[1:]...)
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out, err := cmd.CombinedOutput()
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return string(out), err
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}
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