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feat(alertmanager): add custom headers to alert manager #826

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Mar 27, 2024
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feat(alertmanager): add custom headers to alert manager #826

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feat(alertmanager): add custom headers to alert manager
Umaaz Mar 27, 2024
0b9f40d
feat(alertmanager): add custom headers to alert manager
Umaaz Mar 27, 2024
2e67522
feat(alertmanager): add custom headers to alert manager
Umaaz Mar 27, 2024
f27381f
Update docs/outputs/alertmanager.md
Umaaz Mar 27, 2024
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2 changes: 1 addition & 1 deletion config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ func getConfig() *types.Configuration {
Quickwit: types.QuickwitOutputConfig{CustomHeaders: make(map[string]string)},
OpenObserve: types.OpenObserveConfig{CustomHeaders: make(map[string]string)},
Webhook: types.WebhookOutputConfig{CustomHeaders: make(map[string]string)},
Alertmanager: types.AlertmanagerOutputConfig{ExtraLabels: make(map[string]string), ExtraAnnotations: make(map[string]string), CustomSeverityMap: make(map[types.PriorityType]string)},
Alertmanager: types.AlertmanagerOutputConfig{ExtraLabels: make(map[string]string), ExtraAnnotations: make(map[string]string), CustomSeverityMap: make(map[types.PriorityType]string), CustomHeaders: make(map[string]string)},
CloudEvents: types.CloudEventsOutputConfig{Extensions: make(map[string]string)},
GCP: types.GcpOutputConfig{PubSub: types.GcpPubSub{CustomAttributes: make(map[string]string)}},
OTLP: types.OTLPOutputConfig{Traces: types.OTLPTraces{ExtraEnvVars: make(map[string]string)}},
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2 changes: 2 additions & 0 deletions config_example.yaml
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Expand Up @@ -81,6 +81,8 @@ alertmanager:
# customseveritymap: "" # comma separated list of tuple composed of a ':' separated Falco priority and Alertmanager severity that is used to override the severity label associated to the priority level of falco event. Example: debug:value_1,critical:value2. Default mapping: emergency:critical,alert:critical,critical:critical,error:warning,warning:warning,notice:information,informational:information,debug:information. (default: "")
# dropeventdefaultpriority: "" # default priority of dropped events, values are emergency|alert|critical|error|warning|notice|informational|debug (default: "critical")
# dropeventthresholds: # comma separated list of priority re-evaluation thresholds of dropped events composed of a ':' separated integer threshold and string priority. Example: `10000:critical, 100:warning, 1:informational` (default: `"10000:critical, 1000:critical, 100:critical, 10:warning, 1:warning"`)
# customHeaders: # Custom headers to add in POST, useful for Authentication
# key: value

elasticsearch:
# hostport: "" # http://{domain or ip}:{port}, if not empty, Elasticsearch output is enabled
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5 changes: 4 additions & 1 deletion docs/outputs/alertmanager.md
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Expand Up @@ -14,7 +14,7 @@
## Configuration

| Setting | Env var | Default value | Description |
| --------------------------------------- | --------------------------------------- | -------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
|-----------------------------------------|-----------------------------------------|----------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `alertmanager.hostport` | `ALERTMANAGER_HOSTPORT` | | http://{domain or ip}:{port}, if not empty, Alertmanager output is **enabled** |
| `alertmanager.mutualtls` | `ALERTMANAGER_MUTUALTLS` | `false` | Authenticate to the output with TLS, if true, checkcert flag will be ignored (server cert will always be checked) |
| `alertmanager.checkcert` | `ALERTMANAGER_CHECKCERT` | `true` | check if ssl certificate of the output is valid |
Expand All @@ -26,6 +26,7 @@
| `alertmanager.dropeventdefaultpriority` | `ALERTMANAGER_DROPEVENTDEFAULTPRIORITY` | `critical` | Default priority of dropped events, values are `emergency,alert,critical,error,warning,notice,informational,debug` |
| `alertmanager.dropeventthresholds` | `ALERTMANAGER_DROPEVENTTHRESHOLDS` | `10000:critical, 1000:critical, 100:critical, 10:warning, 1:warning` | Comma separated list of priority re-evaluation thresholds of dropped events composed of a ':' separated integer threshold and string priority. Example: `10000:critical, 100:warning, 1:informational` |
| `alertmanager.minimumpriority` | `ALERTMANAGER_MINIMUMPRIORITY` | `""` (= `debug`) | Minimum priority of event for using this output, order is `emergency,alert,critical,error,warning,notice,informational,debug or ""` |
| `alertmanager.customheaders` | `ALERTMANAGER_CUSTOMHEADERS` | | Custom headers for the POST request |

> **Note**
The Env var values override the settings from yaml file.
Expand All @@ -45,6 +46,8 @@ alertmanager:
# dropeventdefaultpriority: "" # default priority of dropped events, values are emergency|alert|critical|error|warning|notice|informational|debug (default: "critical")
# dropeventthresholds: # comma separated list of priority re-evaluation thresholds of dropped events composed of a ':' separated integer threshold and string priority. Example: `10000:critical, 100:warning, 1:informational` (default: `"10000:critical, 1000:critical, 100:critical, 10:warning, 1:warning"`)
# minimumpriority: "" # minimum priority of event for using this output, order is emergency|alert|critical|error|warning|notice|informational|debug or "" (default)
# customHeaders: # Custom headers to add in POST, useful for Authentication
# key: value
```

## Screenshots
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5 changes: 5 additions & 0 deletions outputs/alertmanager.go
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Expand Up @@ -139,6 +139,11 @@ func newAlertmanagerPayload(falcopayload types.FalcoPayload, config *types.Confi
// AlertmanagerPost posts event to AlertManager
func (c *Client) AlertmanagerPost(falcopayload types.FalcoPayload) {
c.Stats.Alertmanager.Add(Total, 1)
c.httpClientLock.Lock()
defer c.httpClientLock.Unlock()
for i, j := range c.Config.Alertmanager.CustomHeaders {
c.AddHeader(i, j)
}

err := c.Post(newAlertmanagerPayload(falcopayload, c.Config))
if err != nil {
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1 change: 1 addition & 0 deletions types/types.go
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Expand Up @@ -273,6 +273,7 @@ type AlertmanagerOutputConfig struct {
DropEventThresholds string
DropEventThresholdsList []ThresholdConfig
DropEventDefaultPriority string
CustomHeaders map[string]string
}

type ElasticsearchOutputConfig struct {
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