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feat(inputs.kubernetes): Extend kube_inventory plugin to include and …
…extend resourcequota, secrets, node, and pod measurement (#13040)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package kube_inventory | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/x509" | ||
| "encoding/pem" | ||
| "strings" | ||
| "time" | ||
|
|
||
| corev1 "k8s.io/api/core/v1" | ||
|
|
||
| "github.com/influxdata/telegraf" | ||
| ) | ||
|
|
||
| func collectSecrets(ctx context.Context, acc telegraf.Accumulator, ki *KubernetesInventory) { | ||
| list, err := ki.client.getTLSSecrets(ctx) | ||
| if err != nil { | ||
| acc.AddError(err) | ||
| return | ||
| } | ||
| for _, i := range list.Items { | ||
| ki.gatherCertificates(i, acc) | ||
| } | ||
| } | ||
|
|
||
| func getFields(cert *x509.Certificate, now time.Time) map[string]interface{} { | ||
| age := int(now.Sub(cert.NotBefore).Seconds()) | ||
| expiry := int(cert.NotAfter.Sub(now).Seconds()) | ||
| startdate := cert.NotBefore.Unix() | ||
| enddate := cert.NotAfter.Unix() | ||
|
|
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| fields := map[string]interface{}{ | ||
| "age": age, | ||
| "expiry": expiry, | ||
| "startdate": startdate, | ||
| "enddate": enddate, | ||
| } | ||
|
|
||
| return fields | ||
| } | ||
|
|
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| func getTags(cert *x509.Certificate) map[string]string { | ||
| tags := map[string]string{ | ||
| "common_name": cert.Subject.CommonName, | ||
| "signature_algorithm": cert.SignatureAlgorithm.String(), | ||
| "public_key_algorithm": cert.PublicKeyAlgorithm.String(), | ||
| } | ||
| tags["issuer_common_name"] = cert.Issuer.CommonName | ||
|
|
||
| san := append(cert.DNSNames, cert.EmailAddresses...) | ||
| for _, ip := range cert.IPAddresses { | ||
| san = append(san, ip.String()) | ||
| } | ||
| for _, uri := range cert.URIs { | ||
| san = append(san, uri.String()) | ||
| } | ||
| tags["san"] = strings.Join(san, ",") | ||
|
|
||
| return tags | ||
| } | ||
|
|
||
| func (ki *KubernetesInventory) gatherCertificates(r corev1.Secret, acc telegraf.Accumulator) { | ||
| now := time.Now() | ||
|
|
||
| for resourceName, val := range r.Data { | ||
| if resourceName != "tls.crt" { | ||
| continue | ||
| } | ||
| block, _ := pem.Decode(val) | ||
| if block == nil { | ||
| return | ||
| } | ||
| cert, err := x509.ParseCertificate(block.Bytes) | ||
| if err != nil { | ||
| return | ||
| } | ||
| fields := getFields(cert, now) | ||
| tags := getTags(cert) | ||
| tags["name"] = r.Name | ||
| tags["namespace"] = r.Namespace | ||
| opts := x509.VerifyOptions{ | ||
| KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageAny}, | ||
| } | ||
| _, err = cert.Verify(opts) | ||
| if err == nil { | ||
| tags["verification"] = "valid" | ||
| fields["verification_code"] = 0 | ||
| } else { | ||
| tags["verification"] = "invalid" | ||
| fields["verification_code"] = 1 | ||
| } | ||
| acc.AddFields(certificateMeasurement, fields, tags) | ||
| } | ||
| } |
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