在 .NET 8 中使用 SFTP 发送文件时出现 System.Security.Cryptography.CryptographicException

Question

我在尝试使用 SFTP 客户端发送文件时遇到以下异常。它以前可以工作，但自从我迁移到 .NET 8 后，我遇到了这个异常。

Negotiation failed. Unsupported instance of ECDiffieHellman algorithm.

是否有任何特定于 SFTP 必须在 .NET 8 中完成的操作才能解决此问题？

这是供参考的代码片段。

 using (var client = new Sftp())
 {
     try
     {
         var privateKey = KeyFromString(Configuration.KeyString);
         var stream = StreamFromString(contents);
         client.Connect(Configuration.Url, Configuration.Port);
         client.Login(Configuration.User, Configuration.Password, privateKey);
         client.PutFile(stream, filename);
         return true;
     }

     catch (Exception ex)
     {
         throw ex;
     }
     finally
     {
         try
         {
             if (client != null) { client.Disconnect(); }
         }
         catch { }
     }
 }

我尝试检查在 .NET 8 中使用 SFTP 的任何指南，但找不到任何相关内容。

这是堆栈跟踪（如果有帮助），已更新以隐藏敏感信息：

Inner exception Rebex.Net.SftpException handled at PutFile:
   at Rebex.Net.Sftp.viema (Rebex.Sftp undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.Sftp.mksfi (Rebex.Sftp undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.Sftp.Connect (Rebex.Sftp undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at PutFile 
Inner exception Rebex.Net.SshException handled at Rebex.Net.Sftp.viema:
   at Rebex.Net.SshSession.lawoz (Rebex.Networking undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.SshSession.Negotiate (Rebex.Networking undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.Sftp+ymnzg.zbkwa.igvda (Rebex.Sftp undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.Sftp.viema (Rebex.Sftp undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
Inner exception System.Security.Cryptography.CryptographicException handled at Rebex.Net.SshSession.lawoz:
   at ymnzg.aoqsw.kaxgn (Rebex.Common undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at ymnzg.aoqsw.kiovp (Rebex.Common undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at ymnzg.lmfzi.bltdt (Rebex.Common undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Security.Cryptography.AsymmetricKeyAlgorithm.scqfy (Rebex.Common undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at ymnzg.yajog.dlafz (Rebex.Networking undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)
   at Rebex.Net.SshSession.lawoz (Rebex.Networking undefined, Version=5.0.7733.0 undefined, Culture=neutral undefined, PublicKeyToken=1c4638788972655d undefined)

Answer 1

这是由旧版本的 Rebex SFTP 和 .NET 7/8 的

ECDiffieHellman

类之间的兼容性问题引起的。此问题已在 Rebex SFTP v6.0.8181 中得到修复。该版本可能适用于 .NET 8，但不受官方支持。

第一个正式支持 .NET 8 的 Rebex SFTP 版本是 Rebex SFTP v7.0.8720。以前的版本尚未使用 .NET 8 进行测试，因为它尚不可用。

您使用的是 Rebex SFTP v5.0.7733，该版本于 2021 年初发布。它支持 .NET 5，但尚未使用 .NET 6、7 或 8 进行测试，并且不受任何这些平台支持。