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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /* | ||
| Copyright 2022 The Kubernetes 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 ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "net/http" | ||
| "strings" | ||
|
|
||
| "k8s.io/kops/pkg/bootstrap" | ||
| ) | ||
|
|
||
| const AzureAuthenticationTokenPrefix = "x-azure-id " | ||
|
|
||
| type azureAuthenticator struct { | ||
| } | ||
|
|
||
| var _ bootstrap.Authenticator = &azureAuthenticator{} | ||
|
|
||
| func NewAzureAuthenticator() (bootstrap.Authenticator, error) { | ||
| return &azureAuthenticator{}, nil | ||
| } | ||
|
|
||
| func (h *azureAuthenticator) CreateToken(body []byte) (string, error) { | ||
| m, err := queryInstanceMetadata() | ||
| if err != nil { | ||
| return "", fmt.Errorf("querying instance metadata: %w", err) | ||
| } | ||
|
|
||
| // The fully qualified VMSS VM resource ID format is: | ||
| // /subscriptions/SUBSCRIPTION_ID/resourceGroups/RESOURCE_GROUP_NAME/providers/Microsoft.Compute/virtualMachineScaleSets/VMSS_NAME/virtualMachines/VMSS_INDEX | ||
| r := strings.Split(m.Compute.ResourceID, "/") | ||
| if len(r) != 11 || r[7] != "virtualMachineScaleSets" || r[9] != "virtualMachines" { | ||
| return "", fmt.Errorf("unexpected resource ID format: %q", m.Compute.ResourceID) | ||
| } | ||
|
|
||
| vmssName := r[8] | ||
| vmssIndex := r[10] | ||
|
|
||
| return AzureAuthenticationTokenPrefix + vmssName + " " + vmssIndex, nil | ||
| } | ||
|
|
||
| type instanceComputeMetadata struct { | ||
| ResourceGroupName string `json:"resourceGroupName"` | ||
| ResourceID string `json:"resourceId"` | ||
| SubscriptionID string `json:"subscriptionId"` | ||
| } | ||
|
|
||
| type instanceMetadata struct { | ||
| Compute *instanceComputeMetadata `json:"compute"` | ||
| } | ||
|
|
||
| // queryInstanceMetadata queries Azure Instance Metadata Service (IMDS) | ||
| // https://learn.microsoft.com/en-us/azure/virtual-machines/instance-metadata-service?tabs=linux | ||
| func queryInstanceMetadata() (*instanceMetadata, error) { | ||
| transport := &http.Transport{Proxy: nil} | ||
|
|
||
| client := http.Client{Transport: transport} | ||
|
|
||
| req, err := http.NewRequest("GET", "http://169.254.169.254/metadata/instance", nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("creating a new request: %w", err) | ||
| } | ||
| req.Header.Add("Metadata", "True") | ||
|
|
||
| q := req.URL.Query() | ||
| q.Add("format", "json") | ||
| q.Add("api-version", "2021-02-01") | ||
| req.URL.RawQuery = q.Encode() | ||
|
|
||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("sending request to the instance metadata server: %w", err) | ||
| } | ||
|
|
||
| defer resp.Body.Close() | ||
| body, err := io.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("reading a response from the metadata server: %w", err) | ||
| } | ||
| metadata := &instanceMetadata{} | ||
| err = json.Unmarshal(body, metadata) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unmarshalling instance metadata: %w", err) | ||
| } | ||
|
|
||
| return metadata, nil | ||
| } |
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