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azure: Add support for dns=none #15627
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azure: Add support for dns=none
hakman ecbcd7a
aws: Add more DNS pre-creation tests
hakman 15b44ba
azure: Remove permissions for nodes when dns=none
hakman 576ef5e
azure: Verify VM ID when registering nodes
hakman 8094432
azure: Allow full load balancer access only when public
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Original file line number | Diff line number | Diff line change |
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/* | ||
Copyright 2022 The Kubernetes Authors. | ||
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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 | ||
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http://www.apache.org/licenses/LICENSE-2.0 | ||
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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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import ( | ||
"encoding/json" | ||
"fmt" | ||
"io" | ||
"net/http" | ||
"strings" | ||
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"k8s.io/kops/pkg/bootstrap" | ||
) | ||
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const AzureAuthenticationTokenPrefix = "x-azure-id " | ||
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type azureAuthenticator struct { | ||
} | ||
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var _ bootstrap.Authenticator = &azureAuthenticator{} | ||
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func NewAzureAuthenticator() (bootstrap.Authenticator, error) { | ||
return &azureAuthenticator{}, nil | ||
} | ||
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func (h *azureAuthenticator) CreateToken(body []byte) (string, error) { | ||
m, err := queryInstanceMetadata() | ||
if err != nil { | ||
return "", fmt.Errorf("querying instance metadata: %w", err) | ||
} | ||
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vmId := m.Compute.VMID | ||
if vmId == "" { | ||
return "", fmt.Errorf("missing virtual machine ID") | ||
} | ||
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// 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] | ||
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return AzureAuthenticationTokenPrefix + vmId + " " + vmssName + " " + vmssIndex, nil | ||
} | ||
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type instanceComputeMetadata struct { | ||
ResourceGroupName string `json:"resourceGroupName"` | ||
ResourceID string `json:"resourceId"` | ||
SubscriptionID string `json:"subscriptionId"` | ||
VMID string `json:"vmId"` | ||
} | ||
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type instanceMetadata struct { | ||
Compute *instanceComputeMetadata `json:"compute"` | ||
} | ||
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// 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} | ||
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client := http.Client{Transport: transport} | ||
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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") | ||
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q := req.URL.Query() | ||
q.Add("format", "json") | ||
q.Add("api-version", "2021-02-01") | ||
req.URL.RawQuery = q.Encode() | ||
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resp, err := client.Do(req) | ||
if err != nil { | ||
return nil, fmt.Errorf("sending request to the instance metadata server: %w", err) | ||
} | ||
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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) | ||
} | ||
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return metadata, nil | ||
} |
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👍 👍 👍
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I'll take on removing the dead code this leaves behind.