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feat: Azure AD Workload Identity support for Azure Scalers and Key Va…
…ult (#2907) * Azure AD Workload Identity Support - Azure Service Bus Scaler. Signed-off-by: Vighnesh Shenoy <vshenoy@microsoft.com>
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| Original file line number | Diff line number | Diff line change |
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@@ -116,7 +116,6 @@ spec: | |
| vaultUri: | ||
| type: string | ||
| required: | ||
| - credentials | ||
| - secrets | ||
| - vaultUri | ||
| type: object | ||
|
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| Original file line number | Diff line number | Diff line change |
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@@ -115,7 +115,6 @@ spec: | |
| vaultUri: | ||
| type: string | ||
| required: | ||
| - credentials | ||
| - secrets | ||
| - vaultUri | ||
| type: object | ||
|
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||
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@@ -28,3 +28,4 @@ resources: | |
| - ../rbac | ||
| - ../manager | ||
| - ../metrics-server | ||
| - ../service_account | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,2 @@ | ||
| resources: | ||
| - namespace.yaml | ||
| - service_account.yaml |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,5 @@ | ||
| resources: | ||
| - service_account.yaml | ||
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| apiVersion: kustomize.config.k8s.io/v1beta1 | ||
| kind: Kustomization |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| Copyright 2022 The KEDA Authors | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package azure | ||
|
|
||
| import "time" | ||
|
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| // AADToken is the token from Azure AD | ||
| type AADToken struct { | ||
| AccessToken string `json:"access_token"` | ||
| RefreshToken string `json:"refresh_token"` | ||
| ExpiresIn string `json:"expires_in"` | ||
| ExpiresOn string `json:"expires_on"` | ||
| ExpiresOnTimeObject time.Time `json:"expires_on_object"` | ||
| NotBefore string `json:"not_before"` | ||
| Resource string `json:"resource"` | ||
| TokenType string `json:"token_type"` | ||
| GrantedScopes []string `json:"grantedScopes"` | ||
| DeclinedScopes []string `json:"DeclinedScopes"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,171 @@ | ||
| /* | ||
| Copyright 2022 The KEDA Authors | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package azure | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| amqpAuth "github.com/Azure/azure-amqp-common-go/v3/auth" | ||
| "github.com/Azure/go-autorest/autorest" | ||
| "github.com/Azure/go-autorest/autorest/azure/auth" | ||
| "github.com/AzureAD/microsoft-authentication-library-for-go/apps/confidential" | ||
| ) | ||
|
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| // Azure AD Workload Identity Webhook will inject the following environment variables. | ||
| // * AZURE_CLIENT_ID - Client id set in the service account annotation | ||
| // * AZURE_TENANT_ID - Tenant id set in the service account annotation. If not defined, then tenant id provided via | ||
| // azure-wi-webhook-config will be used. | ||
| // * AZURE_FEDERATED_TOKEN_FILE - Service account token file path | ||
| // * AZURE_AUTHORITY_HOST - Azure Active Directory (AAD) endpoint. | ||
| const ( | ||
| azureClientIDEnv = "AZURE_CLIENT_ID" | ||
| azureTenantIDEnv = "AZURE_TENANT_ID" | ||
| azureFederatedTokenFileEnv = "AZURE_FEDERATED_TOKEN_FILE" | ||
| azureAuthrityHostEnv = "AZURE_AUTHORITY_HOST" | ||
| ) | ||
|
|
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| // GetAzureADWorkloadIdentityToken returns the AADToken for resource | ||
| func GetAzureADWorkloadIdentityToken(ctx context.Context, resource string) (AADToken, error) { | ||
| clientID := os.Getenv(azureClientIDEnv) | ||
| tenantID := os.Getenv(azureTenantIDEnv) | ||
| tokenFilePath := os.Getenv(azureFederatedTokenFileEnv) | ||
| authorityHost := os.Getenv(azureAuthrityHostEnv) | ||
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| signedAssertion, err := readJWTFromFileSystem(tokenFilePath) | ||
| if err != nil { | ||
| return AADToken{}, fmt.Errorf("error reading service account token - %w", err) | ||
| } | ||
|
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| cred, err := confidential.NewCredFromAssertion(signedAssertion) | ||
| if err != nil { | ||
| return AADToken{}, fmt.Errorf("error getting credentials from service account token - %w", err) | ||
| } | ||
|
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| authorityOption := confidential.WithAuthority(fmt.Sprintf("%s%s/oauth2/token", authorityHost, tenantID)) | ||
| confidentialClient, err := confidential.New( | ||
| clientID, | ||
| cred, | ||
| authorityOption, | ||
| ) | ||
| if err != nil { | ||
| return AADToken{}, fmt.Errorf("error creating confidential client - %w", err) | ||
| } | ||
|
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| result, err := confidentialClient.AcquireTokenByCredential(ctx, []string{getScopedResource(resource)}) | ||
| if err != nil { | ||
| return AADToken{}, fmt.Errorf("error acquiring aad token - %w", err) | ||
| } | ||
|
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| return AADToken{ | ||
| AccessToken: result.AccessToken, | ||
| ExpiresOn: strconv.FormatInt(result.ExpiresOn.Unix(), 10), | ||
| ExpiresOnTimeObject: result.ExpiresOn, | ||
| GrantedScopes: result.GrantedScopes, | ||
| DeclinedScopes: result.DeclinedScopes, | ||
| }, nil | ||
| } | ||
|
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| func readJWTFromFileSystem(tokenFilePath string) (string, error) { | ||
| token, err := os.ReadFile(tokenFilePath) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(token), nil | ||
| } | ||
|
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| func getScopedResource(resource string) string { | ||
| resource = strings.TrimSuffix(resource, "/") | ||
| if !strings.HasSuffix(resource, ".default") { | ||
| resource += "/.default" | ||
| } | ||
|
|
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| return resource | ||
| } | ||
|
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| type ADWorkloadIdentityConfig struct { | ||
| ctx context.Context | ||
| Resource string | ||
| } | ||
|
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| func NewAzureADWorkloadIdentityConfig(ctx context.Context, resource string) auth.AuthorizerConfig { | ||
| return ADWorkloadIdentityConfig{ctx: ctx, Resource: resource} | ||
| } | ||
|
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| // Authorizer implements the auth.AuthorizerConfig interface | ||
| func (aadWiConfig ADWorkloadIdentityConfig) Authorizer() (autorest.Authorizer, error) { | ||
| return autorest.NewBearerAuthorizer(&ADWorkloadIdentityTokenProvider{ctx: aadWiConfig.ctx, Resource: aadWiConfig.Resource}), nil | ||
| } | ||
|
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| // ADWorkloadIdentityTokenProvider is a type that implements the adal.OAuthTokenProvider and adal.Refresher interfaces. | ||
| // The OAuthTokenProvider interface is used by the BearerAuthorizer to get the token when preparing the HTTP Header. | ||
| // The Refresher interface is used by the BearerAuthorizer to refresh the token. | ||
| type ADWorkloadIdentityTokenProvider struct { | ||
| ctx context.Context | ||
| Resource string | ||
| aadToken AADToken | ||
| } | ||
|
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| func NewADWorkloadIdentityTokenProvider(ctx context.Context, resource string) *ADWorkloadIdentityTokenProvider { | ||
| return &ADWorkloadIdentityTokenProvider{ctx: ctx, Resource: resource} | ||
| } | ||
|
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| // OAuthToken is for implementing the adal.OAuthTokenProvider interface. It returns the current access token. | ||
| func (wiTokenProvider *ADWorkloadIdentityTokenProvider) OAuthToken() string { | ||
| return wiTokenProvider.aadToken.AccessToken | ||
| } | ||
|
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| // Refresh is for implementing the adal.Refresher interface | ||
| func (wiTokenProvider *ADWorkloadIdentityTokenProvider) Refresh() error { | ||
| if time.Now().Before(wiTokenProvider.aadToken.ExpiresOnTimeObject) { | ||
| return nil | ||
| } | ||
|
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| aadToken, err := GetAzureADWorkloadIdentityToken(wiTokenProvider.ctx, wiTokenProvider.Resource) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| wiTokenProvider.aadToken = aadToken | ||
| return nil | ||
| } | ||
|
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| // RefreshExchange is for implementing the adal.Refresher interface | ||
| func (wiTokenProvider *ADWorkloadIdentityTokenProvider) RefreshExchange(resource string) error { | ||
| wiTokenProvider.Resource = resource | ||
| return wiTokenProvider.Refresh() | ||
| } | ||
|
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| // EnsureFresh is for implementing the adal.Refresher interface | ||
| func (wiTokenProvider *ADWorkloadIdentityTokenProvider) EnsureFresh() error { | ||
| return wiTokenProvider.Refresh() | ||
| } | ||
|
|
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| // GetToken is for implementing the auth.TokenProvider interface | ||
| func (wiTokenProvider *ADWorkloadIdentityTokenProvider) GetToken(uri string) (*amqpAuth.Token, error) { | ||
| err := wiTokenProvider.Refresh() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return amqpAuth.NewToken(amqpAuth.CBSTokenTypeJWT, wiTokenProvider.aadToken.AccessToken, | ||
| wiTokenProvider.aadToken.ExpiresOn), nil | ||
| } |
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