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azureblob: support simple "environment credentials"

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As per
https://learn.microsoft.com/en-us/dotnet/api/azure.identity.environmentcredential?view=azure-dotnet

This supports only AZURE_CLIENT_SECRET-based authentication, as with the
existing service principal support.

Co-authored-by: Nick Craig-Wood <nick@craig-wood.com>
This commit is contained in:
Nathaniel Wesley Filardo 2022-11-14 04:12:52 +00:00 committed by Nick Craig-Wood
parent 6f3682c12f
commit f7cdf318db
1 changed files with 27 additions and 8 deletions
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35
backend/azureblob/azureblob.go
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@ -88,6 +88,15 @@ Leave blank normally. Needed only if you want to use a service principal instead
See ["Create an Azure service principal"](https://docs.microsoft.com/en-us/cli/azure/create-an-azure-service-principal-azure-cli) and ["Assign an Azure role for access to blob data"](https://docs.microsoft.com/en-us/azure/storage/common/storage-auth-aad-rbac-cli) pages for more details.
`,
}, {
Name: "env_auth",
Help: `Read credentials from runtime (environment variables).
Pull credentials from AZURE_TENANT_ID and AZURE_CLIENT_{ID,SECRET} environment vars.
See EnvironmentCredential in the Azure docs for more info.
Other authentication methods will, if specified, override this flag.`,
Default: false,
}, {
Name: "key",
Help: "Storage Account Key.\n\nLeave blank to use SAS URL or Emulator.",
@ -270,6 +279,7 @@ type Options struct {
Account string `config:"account"`
ServicePrincipalFile string `config:"service_principal_file"`
Key string `config:"key"`
EnvAuth bool `config:"env_auth"`
UseMSI bool `config:"use_msi"`
MSIObjectID string `config:"msi_object_id"`
MSIClientID string `config:"msi_client_id"`
@ -714,20 +724,29 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
} else {
serviceURL = azblob.NewServiceURL(*u, pipeline)
}
case opt.ServicePrincipalFile != "":
case opt.ServicePrincipalFile != "" || opt.EnvAuth:
// Create a standard URL.
u, err = url.Parse(fmt.Sprintf("https://%s.%s", opt.Account, opt.Endpoint))
if err != nil {
return nil, fmt.Errorf("failed to make azure storage url from account and endpoint: %w", err)
}
// Try loading service principal credentials from file.
loadedCreds, err := os.ReadFile(env.ShellExpand(opt.ServicePrincipalFile))
if err != nil {
return nil, fmt.Errorf("error opening service principal credentials file: %w", err)
}
var spCredentials servicePrincipalCredentials
if err := json.Unmarshal(loadedCreds, &spCredentials); err != nil {
return nil, fmt.Errorf("error parsing credentials from JSON file: %w", err)
if opt.ServicePrincipalFile != "" {
// Try loading service principal credentials from file.
loadedCreds, err := os.ReadFile(env.ShellExpand(opt.ServicePrincipalFile))
if err != nil {
return nil, fmt.Errorf("error opening service principal credentials file: %w", err)
}
if err := json.Unmarshal(loadedCreds, &spCredentials); err != nil {
return nil, fmt.Errorf("error parsing credentials from JSON file: %w", err)
}
} else {
spCredentials = servicePrincipalCredentials{
Tenant: os.Getenv("AZURE_TENANT_ID"),
AppID: os.Getenv("AZURE_CLIENT_ID"),
Password: os.Getenv("AZURE_CLIENT_SECRET"),
}
}
// Create a token refresher from service principal credentials.
tokenRefresher, err := newServicePrincipalTokenRefresher(ctx, spCredentials)