How to send encrypted connection string #9738

15 Answer(s)

• 

  0

  AI-Bot created one month ago

  Support Team ABP Agent

  To use an encrypted connection string in ABP Framework, you must ensure that the connection string is decrypted before it is passed to Entity Framework Core or any database provider. The connection string in appsettings.json can be stored encrypted, but the framework and EF Core expect a plain (decrypted) connection string at runtime.

  Here's how you can achieve this:

  1. Store the Encrypted Connection String:
     • In your appsettings.json, store the encrypted value as you have done:

  "ConnectionStrings": {
         "Default": "ENC_5W8PezYlu1g+VaIc/XzdKRGabzhpT8aAbk7R2Irkt8AhOpODisXIK4SMQEmd4EuT91Y....."
       }
  

  2. Decrypt the Connection String at Runtime:

     • You need to decrypt the connection string before it is used by EF Core. The recommended way is to use ABP's IStringEncryptionService in your application's startup or DbContext factory.

     • Example for a design-time DbContext factory:

  public class AbpTemplateDbContextFactory : IDesignTimeDbContextFactory<AbpTemplateDbContext>
       {
           public AbpTemplateDbContext CreateDbContext(string[] args)
           {
               var configuration = BuildConfiguration();
  
               AbpTemplateEfCoreEntityExtensionMappings.Configure();
  
               // Get the encrypted connection string
               var encryptedConnectionString = configuration.GetConnectionString("Default");
  
               // Decrypt using the same passphrase as in production
               var stringEncryptionService = new StringEncryptionService(
                   new AbpStringEncryptionOptions
                   {
                       DefaultPassPhrase = "YourPassPhrase" // Must match the one used for encryption
                   }
               );
               var connectionString = stringEncryptionService.Decrypt(encryptedConnectionString);
  
               var builder = new DbContextOptionsBuilder<AbpTemplateDbContext>()
                   .UseSqlServer(connectionString);
  
               return new AbpTemplateDbContext(builder.Options);
           }
  
           private static IConfigurationRoot BuildConfiguration()
           {
               var builder = new ConfigurationBuilder()
                   .SetBasePath(Path.Combine(Directory.GetCurrentDirectory(), "../AbpTemplate.DbMigrator/"))
                   .AddJsonFile("appsettings.json", optional: false);
  
               return builder.Build();
           }
       }
  

  • If you are using dependency injection (in runtime, not design-time), you can inject IStringEncryptionService and decrypt the connection string before passing it to EF Core.

  3. Important Notes:

     • The connection string must be decrypted before it is used by EF Core. If you pass the encrypted value directly, you will get the "Format of the initialization string does not conform to specification" error.
     • Make sure the passphrase and encryption options used for decryption match those used for encryption.
     • For production, do not store the passphrase in source control. Use environment variables or user secrets.

  4. Configuring String Encryption Options:

     • In your module or startup, configure the encryption options:

  Configure<AbpStringEncryptionOptions>(options =>
       {
           options.DefaultPassPhrase = "YourPassPhrase";
       });
  

  References:

  • ABP String Encryption
  • Configuring for Production (String Encryption)
  • ABP Support: Setting Connection String from External Source

  This approach ensures that your connection string is always decrypted before being used by the database provider, resolving the error you encountered.

  ---

  This response was generated by AI. If it didn’t solve your problem, feel free to post a new answer — our support team will jump in to help you soon.

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• 

  0

  thaisonsoft.ios created one month ago

  Actually, my way same with your answer. Where I need to update connection string value? There is all my code:

  AbpTemplateDomainModule.cs Configure<AbpStringEncryptionOptions>(opts => { var configuration = context.Services.GetConfiguration(); var securityConfig = configuration.GetSection("App:Security"); var configure = new SettingsDto() { EnabledEncryption = bool.Parse(securityConfig["EnabledEncryption"]), EncryptionKey = securityConfig["EncryptionKey"], EncryptionIv = securityConfig["EncryptionIv"], EncryptedPrefix = securityConfig["EncryptedPrefix"] };

  if (configure.EnabledEncryption)
  {
      if (string.IsNullOrWhiteSpace(configure.EncryptionKey) || string.IsNullOrEmpty(configure.EncryptionIv))
          throw new Exception("EncryptionKey or EncryptionIv is missing");
  
      var key = Environment.GetEnvironmentVariable(configure.EncryptionKey);
      var iv = Environment.GetEnvironmentVariable(configure.EncryptionIv);
  
      if (string.IsNullOrWhiteSpace(key) || string.IsNullOrWhiteSpace(iv))
      {
          throw new Exception($"{configure.EncryptionKey} or {configure.EncryptionIv} environment variable is missing.");
      }
      if (key.Length != 44 || iv.Length != 24)
      {
          throw new Exception();
      }
  
      try
      {
          var keyBytes = Convert.FromBase64String(key);
          var ivBytes = Convert.FromBase64String(iv);
          if (keyBytes.Length != 32 || ivBytes.Length != 16)
          {
              throw new Exception();
          }
  
          opts.DefaultPassPhrase = key;
          opts.DefaultSalt = keyBytes;
          opts.InitVectorBytes = ivBytes;
      }
      catch (FormatException)
      {
          throw new Exception();
      }
  }
  

  });

  EncryptedConnectionStringResolver.cs public class EncryptedConnectionStringResolver { public IAbpLazyServiceProvider LazyServiceProvider { get; set; } = default!; protected IStringEncryptionService StringEncryptionService => LazyServiceProvider.LazyGetService<IStringEncryptionService>();

  public EncryptedConnectionStringResolver()
  {
  }
  
  public string EncryptConnectionString(string connectionString)
  {
      var configure = LoadEncryptionConfig();
  
      if (configure.EnabledEncryption && !connectionString.StartsWith(configure.EncryptedPrefix))
      {
          var key = Environment.GetEnvironmentVariable(configure.EncryptionKey);
          var iv = Environment.GetEnvironmentVariable(configure.EncryptionIv);
          var keyBytes = Convert.FromBase64String(key);
          var ivBytes = Convert.FromBase64String(iv);
  
          ValidateEnvironmentVariables(configure.EncryptionKey, configure.EncryptionIv, key, iv, keyBytes, ivBytes);
  
          var encryptedValue = StringEncryptionService.Encrypt(connectionString);
          return $"{configure.EncryptedPrefix}{encryptedValue}";
      }
  
      return connectionString;
  }
  
  // Send all text of the encrypted connection string
  public string DecryptConnectionString(string encryptedConnectionString)
  {
      var configure = LoadEncryptionConfig();
      if (configure.EnabledEncryption && encryptedConnectionString.StartsWith(configure.EncryptedPrefix))
      {
          var key = Environment.GetEnvironmentVariable(configure.EncryptionKey);
          var iv = Environment.GetEnvironmentVariable(configure.EncryptionIv);
          var keyBytes = Convert.FromBase64String(key);
          var ivBytes = Convert.FromBase64String(iv);
  
          ValidateEnvironmentVariables(configure.EncryptionKey, configure.EncryptionIv, key, iv, keyBytes, ivBytes);
  
          return StringEncryptionService.Decrypt(encryptedConnectionString.Substring(configure.EncryptedPrefix.Length));
      }
  
      return encryptedConnectionString;
  }
  
  private SettingsDto LoadEncryptionConfig()
  {
      var configurationRoot = AppConfigurations.Get(WebContentDirectoryFinder.CalculateContentRootFolder());
      var securityConfig = configurationRoot.GetSection("App:Security");
  
      var configure = new SettingsDto()
      {
          EnabledEncryption = bool.Parse(securityConfig["EnabledEncryption"]),
          EncryptionKey = securityConfig["EncryptionKey"],
          EncryptionIv = securityConfig["EncryptionIv"],
          EncryptedPrefix = securityConfig["EncryptedPrefix"]
      };
  
      if (!configure.EnabledEncryption)
          return configure;
  
      if (string.IsNullOrWhiteSpace(configure.EncryptionKey) || string.IsNullOrEmpty(configure.EncryptionIv))
          throw new Exception();
  
      var key = Environment.GetEnvironmentVariable(configure.EncryptionKey);
      var iv = Environment.GetEnvironmentVariable(configure.EncryptionIv);
  
      try
      {
          var keyBytes = Convert.FromBase64String(key);
          var ivBytes = Convert.FromBase64String(iv);
          if (keyBytes.Length != 32 || ivBytes.Length != 16)
          {
              throw new Exception();
          }
      }
      catch (FormatException)
      {
          throw new Exception();
      }
      return configure;
  }
  
  private void ValidateEnvironmentVariables(string encryptionKey, string encryptionIv, string key, string iv, byte[] keyBytes, byte[] ivBytes)
  {
      if (string.IsNullOrWhiteSpace(encryptionKey) || string.IsNullOrWhiteSpace(encryptionIv))
      {
          throw new Exception();
      }
      if (key.Length != 44 || iv.Length != 24)
      {
          throw new Exception();
      }
  
      try
      {
          if (keyBytes.Length != 32 || ivBytes.Length != 16)
          {
              throw new Exception();
          }
      }
      catch (FormatException)
      {
          throw new Exception();
      }
  }
  

  }

  AbpTemplateDbContextFactory.cs public class AbpTemplateDbContextFactory : IDesignTimeDbContextFactory<AbpTemplateDbContext> { public AbpTemplateDbContext CreateDbContext(string[] args) { var configuration = BuildConfiguration();

      AbpTemplateEfCoreEntityExtensionMappings.Configure();
  
      var encryptionResolver = new EncryptedConnectionStringResolver();
      var connectionString = encryptionResolver.DecryptConnectionString(configuration.GetConnectionString("Default"));
      var builder = new DbContextOptionsBuilder<AbpTemplateDbContext>()
          .UseSqlServer(connectionString);
      
      return new AbpTemplateDbContext(builder.Options);
  }
  
  private static IConfigurationRoot BuildConfiguration()
  {
      var builder = new ConfigurationBuilder()
          .SetBasePath(Path.Combine(Directory.GetCurrentDirectory(), "../AbpTemplate.DbMigrator/"))
          .AddJsonFile("appsettings.json", optional: false);
  
      return builder.Build();
  }
  

  }

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• 

  0

  maliming created one month ago

  Support Team Fullstack Developer

  hi

  Can you try to override the default MultiTenantConnectionStringResolver?

  https://github.com/abpframework/abp/blob/dev/framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/MultiTenantConnectionStringResolver.cs#L27-L82

  Then decrypt the value in it.

  Thanks.

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• 

  0

  thaisonsoft.ios created one month ago

  I was override MultiTenantConnectionStringResolver but when debugging, it always goes into if (_currentTenant.Id == null) condition and same error.

  public class MultiTenantConnectionStringResolver : DefaultConnectionStringResolver { private readonly ICurrentTenant _currentTenant; private readonly IServiceProvider _serviceProvider;

  public MultiTenantConnectionStringResolver(
      IOptionsMonitor<AbpDbConnectionOptions> options,
      ICurrentTenant currentTenant,
      IServiceProvider serviceProvider)
      : base(options)
  {
      _currentTenant = currentTenant;
      _serviceProvider = serviceProvider;
  }
  
  public override async Task<string> ResolveAsync(string? connectionStringName = null)
  {
      if (_currentTenant.Id == null)
      {
          //No current tenant, fallback to default logic
          return await base.ResolveAsync(connectionStringName);
      }
      
      // ...
  }
  

  }

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  0

  maliming created one month ago

  Support Team Fullstack Developer

  hi

  Continue to override more base class methods.

  https://github.com/abpframework/abp/blob/dev/framework/src/Volo.Abp.Data/Volo/Abp/Data/DefaultConnectionStringResolver.cs#L18-L44

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• 

  0

  thaisonsoft.ios created one month ago

  Yeah, after check MultiTenantConnectionStringResolver, I found DefaultConnectionStringResolver need to override also. It's ok for me now.

  I registered DI EncryptedConnectionStringResolver.cs public class EncryptedConnectionStringResolver { public IAbpLazyServiceProvider LazyServiceProvider { get; set; } = default!; protected IStringEncryptionService StringEncryptionService => LazyServiceProvider.LazyGetService<IStringEncryptionService>();

  public EncryptedConnectionStringResolver()
  {
  }
  

  }

  LazyServiceProvider is null, what wrong maliming?

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• 

  0

  maliming created one month ago

  Support Team Fullstack Developer

  hi

  Please share the full code.

  Thanks.

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• 

  0

  thaisonsoft.ios created one month ago

  My code here, please help to check.

  public class EncryptedConnectionStringResolver : ITransientDependency
  {
      public IAbpLazyServiceProvider LazyServiceProvider { get; set; } = default!;
      protected IStringEncryptionService StringEncryptionService => LazyServiceProvider.LazyGetService<IStringEncryptionService>();
  
      public EncryptedConnectionStringResolver()
      {
      }
  
      public string EncryptConnectionString(string connectionString)
      {
          var configure = LoadEncryptionConfig();
  
          if (configure.EnabledEncryption && !connectionString.StartsWith(configure.EncryptedPrefix))
          {
              var key = Environment.GetEnvironmentVariable(configure.EncryptionKey);
              var iv = Environment.GetEnvironmentVariable(configure.EncryptionIv);
              var keyBytes = Convert.FromBase64String(key);
              var ivBytes = Convert.FromBase64String(iv);
  
              ValidateEnvironmentVariables(configure.EncryptionKey, configure.EncryptionIv, key, iv, keyBytes, ivBytes);
  
              var encryptedValue = StringEncryptionService.Encrypt(connectionString);
              return $"{configure.EncryptedPrefix}{encryptedValue}";
          }
  
          return connectionString;
      }
  
      // Send all text of the encrypted connection string
      public string DecryptConnectionString(string encryptedConnectionString)
      {
          var configure = LoadEncryptionConfig();
          
          return encryptedConnectionString;
      }
  
      private SettingsDto LoadEncryptionConfig()
      {
          var configurationRoot = AppConfigurations.Get(WebContentDirectoryFinder.CalculateContentRootFolder());
          var securityConfig = configurationRoot.GetSection("App:Security");
  
          var configure = new SettingsDto()
          {
              EnabledEncryption = bool.Parse(securityConfig["EnabledEncryption"]),
              EncryptionKey = securityConfig["EncryptionKey"],
              EncryptionIv = securityConfig["EncryptionIv"],
              EncryptedPrefix = securityConfig["EncryptedPrefix"]
          };
  
          return configure;
      }
  
      private void ValidateEnvironmentVariables(string encryptionKey, string encryptionIv, string key, string iv, byte[] keyBytes, byte[] ivBytes)
      {
          // ...
      }
  }
  
  

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• 

  0

  maliming created one month ago

  Support Team Fullstack Developer

  Have you integrated AutoFac?

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• 

  0

  thaisonsoft.ios created one month ago

  I have.

  public class Program { public async static Task<int> Main(string[] args) { Log.Logger = new LoggerConfiguration() .WriteTo.Async(c => c.File("Logs/logs.txt")) .WriteTo.Async(c => c.Console()) .CreateBootstrapLogger();

      try
      {
          Log.Information("Starting web host.");
          var builder = WebApplication.CreateBuilder(args);
          builder.Host
              .AddAppSettingsSecretsJson()
              .UseAutofac()
              .UseSerilog((context, services, loggerConfiguration) =>
              {
                  loggerConfiguration
                  #if DEBUG
                      .MinimumLevel.Debug()
                  #else
                      .MinimumLevel.Information()
                  #endif
                      .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
                      .MinimumLevel.Override("Microsoft.EntityFrameworkCore", LogEventLevel.Warning)
                      .Enrich.FromLogContext()
                      .WriteTo.Async(c => c.File("Logs/logs.txt"))
                      .WriteTo.Async(c => c.Console())
                      .WriteTo.Async(c => c.AbpStudio(services));
              });
          await builder.AddApplicationAsync<AbpTemplateWebModule>();
          var app = builder.Build();
          await app.InitializeApplicationAsync();
          await app.RunAsync();
          return 0;
      }
      catch (Exception ex)
      {
          Log.Fatal(ex, "Host terminated unexpectedly!");
          return 1;
      }
      finally
      {
          Log.CloseAndFlush();
      }
  }
  

  }

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• 

  0

  maliming created one month ago

  Support Team Fullstack Developer

  Thanks. Can you share a simple project?

  liming.ma@volosoft.com

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• 

  0

  thaisonsoft.ios created one month ago

  Please check your email.

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  0

  maliming created one month ago

  Support Team Fullstack Developer

  hi

  Try to inject the EncryptedConnectionStringResolver or get it from IServiceProvider

  

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  0

  thaisonsoft.ios created one month ago

  @maliming: Thank you for your support. I was resolve my problem.

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  0

  maliming created one month ago

  Support Team Fullstack Developer

  Great

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