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Merge pull request #170 from snootan/feat/add-governor-agent
Add governor api call provision to send cluster telemetry data
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package cspauth | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "github.com/vmware-tanzu/cloud-native-security-inspector/src/lib/log" | ||
| "github.com/vmware-tanzu/cloud-native-security-inspector/src/lib/retry" | ||
| v12 "k8s.io/api/core/v1" | ||
| "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/client-go/kubernetes" | ||
| "math" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| tokenMaxAgeSeconds = 1700 | ||
| apiToken = "API_TOKEN" | ||
| accessTokenSecretName = "governor-accesstoken" | ||
| governorTokenExpiresIn = "governorAccessTokenExpiresIn" | ||
| governorAccessTokenKey = "governorAccessToken" | ||
| Retry = 3 | ||
| ) | ||
|
|
||
| var RetryDelay time.Duration = 5 | ||
|
|
||
| // Provider is an interface to interact with an authorization service | ||
| type Provider interface { | ||
| // GetBearerToken retrieves a short-lived access token to use in a single HTTP request | ||
| GetBearerToken(kubernetes.Interface, context.Context, string, string) (string, error) | ||
| } | ||
|
|
||
| type CspAuth struct { | ||
| CspClient CSPClient | ||
|
|
||
| apiToken string | ||
| } | ||
|
|
||
| func (a *CspAuth) GetBearerToken(clientSet kubernetes.Interface, ctx context.Context, cspSecretNamespace string, cspSecretName string) (string, error) { | ||
| accessSecret, err := getOrCreateSecretForAccessToken(clientSet, ctx, cspSecretNamespace) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
|
||
| accessToken := string(accessSecret.Data[governorAccessTokenKey]) | ||
| expiresIn := string(accessSecret.Data[governorTokenExpiresIn]) | ||
| accessTokenExpiresIn, _ := time.Parse(time.Layout, expiresIn) | ||
|
|
||
| if accessToken == "" || time.Now().After(accessTokenExpiresIn) { | ||
| apiToken, err := getCSPTokenFromSecret(clientSet, ctx, cspSecretNamespace, cspSecretName) | ||
| if err != nil { | ||
| return "", fmt.Errorf("Failed to fetch CSP api-token: %w", err) | ||
| } | ||
| a.apiToken = apiToken | ||
| if err := a.refreshToken(ctx, clientSet, cspSecretNamespace, accessSecret); err != nil { | ||
| return "", err | ||
| } | ||
| } | ||
| return string(accessSecret.Data[governorAccessTokenKey]), nil | ||
| } | ||
|
|
||
| func (a *CspAuth) refreshToken(ctx context.Context, clientSet kubernetes.Interface, cspSecretNamespace string, accessTokenSecret *v12.Secret) error { | ||
| return retry.NewRetry( | ||
| retry.WithName("auth token refresh"), | ||
| retry.WithMaxAttempts(Retry), | ||
| retry.WithIncrementDelay(RetryDelay*time.Second, RetryDelay*time.Second), | ||
| ).Run(ctx, func() (bool, error) { | ||
| now := time.Now() | ||
| cspAuthResponse, err := a.CspClient.GetCspAuthorization(ctx, a.apiToken) | ||
| if err != nil { | ||
| log.Error(err, "We got an error back from CSP") | ||
| return false, nil | ||
| } | ||
|
|
||
| expiresIn := time.Duration(math.Min(float64(cspAuthResponse.ExpiresIn), tokenMaxAgeSeconds)) * time.Second | ||
| formattedExpiration := now.Add(expiresIn).Format(time.Layout) | ||
|
|
||
| log.Infof("Refreshed access token for governor which expires in %s", formattedExpiration) | ||
| accessTokenSecret.Data = make(map[string][]byte, 0) | ||
| accessTokenSecret.Data[governorAccessTokenKey] = []byte(cspAuthResponse.AccessToken) | ||
| accessTokenSecret.Data[governorTokenExpiresIn] = []byte(formattedExpiration) | ||
| _, err = clientSet.CoreV1().Secrets(cspSecretNamespace).Update(ctx, accessTokenSecret, v1.UpdateOptions{}) | ||
| if err != nil { | ||
| log.Error(err, "We got an error updating access token secret") | ||
| return false, nil | ||
| } | ||
| log.Infof("Obtained CSP access token, next refresh in %s\n", expiresIn) | ||
| return true, nil | ||
| }) | ||
| } | ||
|
|
||
| func getCSPTokenFromSecret(clientSet kubernetes.Interface, ctx context.Context, ns string, secretName string) (string, error) { | ||
| secret, err := clientSet.CoreV1().Secrets(ns).Get(ctx, secretName, v1.GetOptions{}) | ||
| if err != nil { | ||
| log.Error(err, "Failed to fetch secret") | ||
| return "", err | ||
| } | ||
| cspApiToken := string(secret.Data[apiToken]) | ||
| return cspApiToken, err | ||
| } | ||
|
|
||
| func getOrCreateSecretForAccessToken(clientSet kubernetes.Interface, ctx context.Context, ns string) (*v12.Secret, error) { | ||
| secret, err := clientSet.CoreV1().Secrets(ns).Get(ctx, accessTokenSecretName, v1.GetOptions{}) | ||
| if err != nil { | ||
| log.Warning(err, "Failed to fetch secret for access token, Now Trying to create new secret for same") | ||
| secret = &v12.Secret{} | ||
| secret.Name = accessTokenSecretName | ||
| secret.Namespace = ns | ||
| secret.Data = make(map[string][]byte, 0) | ||
| secret, err = clientSet.CoreV1().Secrets(ns).Create(ctx, secret, v1.CreateOptions{}) | ||
| if err != nil { | ||
| log.Error(err, "Failed to create secret for storing access token.") | ||
| return nil, err | ||
| } | ||
| } | ||
| return secret, err | ||
| } |
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