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Merge pull request #66180 from kkmsft/user_assigned_msi

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Automatic merge from submit-queue (batch tested with PRs 62423, 66180, 66492, 66506, 65242). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Add user assigned MSI support

**What this PR does / why we need it**:
Adds the support for generating tokens via user assigned MSI. 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes # 

**Special notes for your reviewer**:

**Release note**:

```release-note
Add support for using User Assigned MSI (https://docs.microsoft.com/en-us/azure/active-directory/managed-service-identity/overview) with Kubernetes cluster on Azure.
```
This commit is contained in:
Kubernetes Submit Queue 2018-07-23 12:32:06 -07:00 committed by GitHub
commit 2beab8623c
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1 changed files with 16 additions and 5 deletions
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21
pkg/cloudprovider/providers/azure/auth/azure_auth.go
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@ -44,28 +44,39 @@ type AzureAuthConfig struct {
AADClientCertPassword string `json:"aadClientCertPassword" yaml:"aadClientCertPassword"`
// Use managed service identity for the virtual machine to access Azure ARM APIs
UseManagedIdentityExtension bool `json:"useManagedIdentityExtension" yaml:"useManagedIdentityExtension"`
// UserAssignedIdentityID contains the Client ID of the user assigned MSI which is assigned to the underlying VMs. If empty the user assigned identity is not used.
// More details of the user assigned identity can be found at: https://docs.microsoft.com/en-us/azure/active-directory/managed-service-identity/overview
// For the user assigned identity specified here to be used, the UseManagedIdentityExtension has to be set to true.
UserAssignedIdentityID string `json:"userAssignedIdentityID" yaml:"userAssignedIdentityID"`
// The ID of the Azure Subscription that the cluster is deployed in
SubscriptionID string `json:"subscriptionId" yaml:"subscriptionId"`
}
// GetServicePrincipalToken creates a new service principal token based on the configuration
func GetServicePrincipalToken(config *AzureAuthConfig, env *azure.Environment) (*adal.ServicePrincipalToken, error) {
oauthConfig, err := adal.NewOAuthConfig(env.ActiveDirectoryEndpoint, config.TenantID)
if err != nil {
return nil, fmt.Errorf("creating the OAuth config: %v", err)
}
if config.UseManagedIdentityExtension {
glog.V(2).Infoln("azure: using managed identity extension to retrieve access token")
msiEndpoint, err := adal.GetMSIVMEndpoint()
if err != nil {
return nil, fmt.Errorf("Getting the managed service identity endpoint: %v", err)
}
if len(config.UserAssignedIdentityID) > 0 {
glog.V(4).Info("azure: using User Assigned MSI ID to retrieve access token")
return adal.NewServicePrincipalTokenFromMSIWithUserAssignedID(msiEndpoint,
env.ServiceManagementEndpoint,
config.UserAssignedIdentityID)
}
glog.V(4).Info("azure: using System Assigned MSI to retrieve access token")
return adal.NewServicePrincipalTokenFromMSI(
msiEndpoint,
env.ServiceManagementEndpoint)
}
oauthConfig, err := adal.NewOAuthConfig(env.ActiveDirectoryEndpoint, config.TenantID)
if err != nil {
return nil, fmt.Errorf("creating the OAuth config: %v", err)
}
if len(config.AADClientSecret) > 0 {
glog.V(2).Infoln("azure: using client_id+client_secret to retrieve access token")
return adal.NewServicePrincipalToken(