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Azure AD Workload Identity support for Azure Service Bus scaler.
Signed-off-by: Vighnesh Shenoy <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
|
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| package azure | ||
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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"` | ||
| 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 +1,88 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
|
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| package azure | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "strconv" | ||
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| "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{}, err | ||
| } | ||
|
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| cred, err := confidential.NewCredFromAssertion(signedAssertion) | ||
| if err != nil { | ||
| return AADToken{}, 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{}, err | ||
| } | ||
|
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| result, err := confidentialClient.AcquireTokenByCredential(ctx, []string{resource}) | ||
| if err != nil { | ||
| return AADToken{}, err | ||
| } | ||
|
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| return AADToken{ | ||
| AccessToken: result.AccessToken, | ||
| ExpiresOn: strconv.FormatInt(result.ExpiresOn.Unix(), 10), | ||
| GrantedScopes: result.GrantedScopes, | ||
| DeclinedScopes: result.DeclinedScopes, | ||
| Resource: resource, | ||
| }, nil | ||
| } | ||
|
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| func readJWTFromFileSystem(tokenFilePath string) (string, error) { | ||
| token, err := os.ReadFile(tokenFilePath) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error reading service account token") | ||
| } | ||
| return string(token), nil | ||
| } |
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