C#无法从Azure密钥库中检索机密

Question

我试图从Azure密钥库中检索一个秘密（不使用凭据，如本教程：示例）：

public static async Task<string> GetSecret(string secretName)
{
   try
   {
       return (await GetClient().GetSecretAsync(keyVaultUrl, secretName)).Value;
   }
   catch (KeyVaultErrorException)
   {
      return null;
   }
   catch (Exception ex)
   {
      return null;
   }
}

public static async Task<string> GetAccessTokenAsync()
{
    AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
    return await azureServiceTokenProvider.GetAccessTokenAsync("https://vault.azure.net");
}

private static KeyVaultClient GetClient()
{
   AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
   using KeyVaultClient keyVaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(azureServiceTokenProvider.KeyVaultTokenCallback));
   return keyVaultClient;
}

但是当我调用getSecret()时，我得到一个

我的密钥库url的格式类似于“https://my-keyvault.vault.azure.net”。

Answer 1

因为在getclient函数中有一个using语句，所以在函数返回时立即释放KeyVaultClient。删除using there并将其移动到您使用客户端的位置。

private static KeyVaultClient GetClient()
{
   AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
   KeyVaultClient keyVaultClient = new KeyVaultClient(new KeyVaultClient.AuthenticationCallback(azureServiceTokenProvider.KeyVaultTokenCallback));
   return keyVaultClient;
}

public static async Task<string> GetSecret(string secretName)
{
   try
   {
       using var client = GetClient();
       return (await client.GetSecretAsync(keyVaultUrl, secretName)).Value;
   }
   catch (KeyVaultErrorException)
   {
      return null;
   }
   catch (Exception ex)
   {
      return null;
   }
}