Merge branch 'add-metrics-on-basic-jail-configuration' into 'main'
Add metrics on basic jail configuration See merge request hectorjsmith/fail2ban-prometheus-exporter!42
This commit is contained in:
commit
025347b7ca
15
README.md
15
README.md
@ -157,6 +157,9 @@ Exposed metrics:
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* `jail_banned_total` (per jail) - Total number of banned IPs since fail2ban startup (includes expired bans)
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* `jail_failed_current` (per jail) - Number of current failures
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* `jail_failed_total` (per jail) - Total number of failures since fail2ban startup
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* `jail_config_ban_time` (per jail) - How long an IP is banned for in this jail (in seconds)
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* `jail_config_find_time` (per jail) - How far back the filter will look for failures in this jail (in seconds)
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* `jail_config_max_retry` (per jail) - The max number of failures allowed before banning an IP in this jail
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* `version` - Version string of the exporter and fail2ban
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**Sample**
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@ -186,6 +189,18 @@ f2b_jail_failed_current{jail="sshd"} 6
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# TYPE f2b_jail_failed_total gauge
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f2b_jail_failed_total{jail="recidive"} 7
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f2b_jail_failed_total{jail="sshd"} 125
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# HELP f2b_config_jail_ban_time How long an IP is banned for in this jail (in seconds)
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# TYPE f2b_config_jail_ban_time gauge
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f2b_config_jail_ban_time{jail="recidive"} 604800
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f2b_config_jail_ban_time{jail="sshd"} 600
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# HELP f2b_config_jail_find_time How far back will the filter look for failures in this jail (in seconds)
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# TYPE f2b_config_jail_find_time gauge
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f2b_config_jail_find_time{jail="recidive"} 86400
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f2b_config_jail_find_time{jail="sshd"} 600
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# HELP f2b_config_jail_max_retries The number of failures allowed until the IP is banned by this jail
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# TYPE f2b_config_jail_max_retries gauge
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f2b_config_jail_max_retries{jail="recidive"} 5
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f2b_config_jail_max_retries{jail="sshd"} 5
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# HELP f2b_up Check if the fail2ban server is up
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# TYPE f2b_up gauge
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f2b_up 1
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@ -46,6 +46,21 @@ var (
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"Total number of IPs banned by this jail (includes expired bans)",
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[]string{"jail"}, nil,
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)
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metricJailBanTime = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "config", "jail_ban_time"),
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"How long an IP is banned for in this jail (in seconds)",
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[]string{"jail"}, nil,
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)
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metricJailFindTime = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "config", "jail_find_time"),
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"How far back will the filter look for failures in this jail (in seconds)",
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[]string{"jail"}, nil,
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)
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metricJailMaxRetry = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "config", "jail_max_retries"),
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"The number of failures allowed until the IP is banned by this jail",
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[]string{"jail"}, nil,
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)
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metricVersionInfo = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "version"),
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"Version of the exporter and fail2ban server",
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@ -98,6 +113,7 @@ func (c *Collector) collectJailMetrics(ch chan<- prometheus.Metric, s *socket.Fa
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for i := range jails {
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c.collectJailStatsMetric(ch, s, jails[i])
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c.collectJailConfigMetrics(ch, s, jails[i])
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}
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}
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@ -123,6 +139,36 @@ func (c *Collector) collectJailStatsMetric(ch chan<- prometheus.Metric, s *socke
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)
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}
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func (c *Collector) collectJailConfigMetrics(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket, jail string) {
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banTime, err := s.GetJailBanTime(jail)
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if err != nil {
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c.socketRequestErrorCount++
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log.Printf("failed to get ban time for jail %s: %v", jail, err)
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} else {
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ch <- prometheus.MustNewConstMetric(
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metricJailBanTime, prometheus.GaugeValue, float64(banTime), jail,
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)
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}
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findTime, err := s.GetJailFindTime(jail)
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if err != nil {
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c.socketRequestErrorCount++
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log.Printf("failed to get find time for jail %s: %v", jail, err)
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} else {
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ch <- prometheus.MustNewConstMetric(
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metricJailFindTime, prometheus.GaugeValue, float64(findTime), jail,
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)
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}
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maxRetry, err := s.GetJailMaxRetries(jail)
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if err != nil {
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c.socketRequestErrorCount++
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log.Printf("failed to get max retries for jail %s: %v", jail, err)
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} else {
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ch <- prometheus.MustNewConstMetric(
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metricJailMaxRetry, prometheus.GaugeValue, float64(maxRetry), jail,
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)
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}
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}
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func (c *Collector) collectVersionMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
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var err error
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var fail2banVersion = ""
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@ -118,6 +118,21 @@ func (s *Fail2BanSocket) GetJailStats(jail string) (JailStats, error) {
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return stats, newBadFormatError(statusCommand, response)
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}
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func (s *Fail2BanSocket) GetJailBanTime(jail string) (int, error) {
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command := fmt.Sprintf(banTimeCommandFmt, jail)
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return s.sendSimpleIntCommand(command)
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}
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func (s *Fail2BanSocket) GetJailFindTime(jail string) (int, error) {
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command := fmt.Sprintf(findTimeCommandFmt, jail)
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return s.sendSimpleIntCommand(command)
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}
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func (s *Fail2BanSocket) GetJailMaxRetries(jail string) (int, error) {
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command := fmt.Sprintf(maxRetriesCommandFmt, jail)
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return s.sendSimpleIntCommand(command)
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}
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func (s *Fail2BanSocket) GetServerVersion() (string, error) {
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response, err := s.sendCommand([]string{versionCommand})
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if err != nil {
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@ -132,6 +147,22 @@ func (s *Fail2BanSocket) GetServerVersion() (string, error) {
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return "", newBadFormatError(versionCommand, response)
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}
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// sendSimpleIntCommand sends a command to the fail2ban socket and parses the response to extract an int.
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// This command assumes that the response data is in the format of `(d, d)` where `d` is a number.
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func (s *Fail2BanSocket) sendSimpleIntCommand(command string) (int, error) {
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response, err := s.sendCommand(strings.Split(command, " "))
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if err != nil {
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return -1, err
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}
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if lvl1, ok := response.(*types.Tuple); ok {
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if banTime, ok := lvl1.Get(1).(int); ok {
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return banTime, nil
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}
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}
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return -1, newBadFormatError(command, response)
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}
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func newBadFormatError(command string, data interface{}) error {
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return fmt.Errorf("(%s) unexpected response format - cannot parse: %v", command, data)
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}
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@ -12,6 +12,9 @@ const (
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pingCommand = "ping"
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statusCommand = "status"
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versionCommand = "version"
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banTimeCommandFmt = "get %s bantime"
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findTimeCommandFmt = "get %s findtime"
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maxRetriesCommandFmt = "get %s maxretry"
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socketReadBufferSize = 1024
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)
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