python - 使用 pysftp 连接到 SFTP 服务器时出现“SSHException：遇到 EC 密钥，预期的 DSA 密钥”
问题描述
我一直在尝试使用以下参数通过 Python pysftp 创建一个 SFTP 连接
import pysftp
srv = pysftp.Connection(host="some.hostname.com", username="username",
private_key="path/key.ppk",port=22,private_key_pass="key")
srv.chdir('/upload/')
srv.put('path/test.csv')
print('file Uploaded')
srv.close()
不幸的是，这给出了错误
SSHException：不是有效的 DSA 私钥文件
完整追溯：
SSHException: not a valid DSA private key file
---------------------------------------------------------------------------
SSHException Traceback (most recent call last)
~\.conda\envs\env_scrapy\lib\site-packages\pysftp.py in __init__(self, host, username, private_key, password, port, private_key_pass, ciphers, log)
178 prv_key = rsakey.from_private_key_file(private_key_file,
--> 179 private_key_pass)
180 except paramiko.SSHException: #if it fails, try dss
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in from_private_key_file(cls, filename, password)
234 """
--> 235 key = cls(filename=filename, password=password)
236 return key
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\rsakey.py in __init__(self, msg, data, filename, password, key, file_obj)
54 if filename is not None:
---> 55 self._from_private_key_file(filename, password)
56 return
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\rsakey.py in _from_private_key_file(self, filename, password)
174 def _from_private_key_file(self, filename, password):
--> 175 data = self._read_private_key_file("RSA", filename, password)
176 self._decode_key(data)
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key_file(self, tag, filename, password)
307 with open(filename, "r") as f:
--> 308 data = self._read_private_key(tag, f, password)
309 return data
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key(self, tag, f, password)
323 if start >= len(lines) or keytype is None:
--> 324 raise SSHException("not a valid {} private key file".format(tag))
325
SSHException: not a valid RSA private key file
我收到了该key.ppk文件，我尝试通过 PuTTYgen 将其转换为密钥文件，并将该文件用作上述代码中的密钥文件。我收到另一个 SSHException
SSHException：遇到 EC 密钥，预期 DSA 密钥
SSHException: encountered EC key, expected DSA key
---------------------------------------------------------------------------
SSHException Traceback (most recent call last)
~\.conda\envs\env_scrapy\lib\site-packages\pysftp.py in __init__(self, host, username, private_key, password, port, private_key_pass, ciphers, log)
178 prv_key = rsakey.from_private_key_file(private_key_file,
--> 179 private_key_pass)
180 except paramiko.SSHException: #if it fails, try dss
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in from_private_key_file(cls, filename, password)
234 """
--> 235 key = cls(filename=filename, password=password)
236 return key
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\rsakey.py in __init__(self, msg, data, filename, password, key, file_obj)
54 if filename is not None:
---> 55 self._from_private_key_file(filename, password)
56 return
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\rsakey.py in _from_private_key_file(self, filename, password)
174 def _from_private_key_file(self, filename, password):
--> 175 data = self._read_private_key_file("RSA", filename, password)
176 self._decode_key(data)
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key_file(self, tag, filename, password)
307 with open(filename, "r") as f:
--> 308 data = self._read_private_key(tag, f, password)
309 return data
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key(self, tag, f, password)
340 raise SSHException(
--> 341 "encountered {} key, expected {} key".format(keytype, tag)
342 )
SSHException: encountered EC key, expected RSA key
During handling of the above exception, another exception occurred:
SSHException Traceback (most recent call last)
<ipython-input-31-ef0970250b08> in <module>
1 srv = pysftp.Connection(host="sftp.doubleaste.com", username="aimleap",
----> 2 private_key="path/finalkey",private_key_pass="keypass")
3 srv.chdir('/upload/')
4 # srv.put('path/test.csv')
5 print('file Uploaded')
~\.conda\envs\env_scrapy\lib\site-packages\pysftp.py in __init__(self, host, username, private_key, password, port, private_key_pass, ciphers, log)
181 dsskey = paramiko.DSSKey
182 prv_key = dsskey.from_private_key_file(private_key_file,
--> 183 private_key_pass)
184 else:
185 # use the paramiko agent key
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in from_private_key_file(cls, filename, password)
233 :raises: `.SSHException` -- if the key file is invalid
234 """
--> 235 key = cls(filename=filename, password=password)
236 return key
237
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\dsskey.py in __init__(self, msg, data, filename, password, vals, file_obj)
63 return
64 if filename is not None:
---> 65 self._from_private_key_file(filename, password)
66 return
67 if (msg is None) and (data is not None):
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\dsskey.py in _from_private_key_file(self, filename, password)
222
223 def _from_private_key_file(self, filename, password):
--> 224 data = self._read_private_key_file("DSA", filename, password)
225 self._decode_key(data)
226
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key_file(self, tag, filename, password)
306 """
307 with open(filename, "r") as f:
--> 308 data = self._read_private_key(tag, f, password)
309 return data
310
~\.conda\envs\env_scrapy\lib\site-packages\paramiko\pkey.py in _read_private_key(self, tag, f, password)
339 else:
340 raise SSHException(
--> 341 "encountered {} key, expected {} key".format(keytype, tag)
342 )
343
SSHException: encountered EC key, expected DSA key
尝试ECDSAKey明确使用类：
private_key1 = ECDSAKey.from_private_key_file("path/finalkey", password="pass")
srv = pysftp.Connection(host="host", username="name", private_key=private_key1)
srv.chdir('/upload/')
srv.put('path/test.csv')
print('file Uploaded')
srv.close()
我得到：
TypeError：预期的 str、字节或 os.PathLike 对象，而不是 ECDSAKey
TypeError: expected str, bytes or os.PathLike object, not ECDSAKey
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-72-880edc39ff10> in <module>
1 srv = pysftp.Connection(host="hostname", username="user",
----> 2 private_key=private_key1,private_key_pass="pass")
3 srv.chdir('/upload/')
4 # srv.put('test.csv')
5 print('file Uploaded')
~\.conda\envs\env_scrapy\lib\site-packages\pysftp\__init__.py in __init__(self, host, username, private_key, password, port, private_key_pass, ciphers, log, cnopts, default_path)
~\.conda\envs\env_scrapy\lib\site-packages\pysftp\__init__.py in _set_authentication(self, password, private_key, private_key_pass)
~\.conda\envs\env_scrapy\lib\ntpath.py in expanduser(path)
289
290 If user or $HOME is unknown, do nothing."""
--> 291 path = os.fspath(path)
292 if isinstance(path, bytes):
293 tilde = b'~'
TypeError: expected str, bytes or os.PathLike object, not ECDSAKey
解决方案
从 0.2.9 版开始，pysftp 仅接受 RSA 和 DSA 密钥。
如果你想/需要使用 ECDSA 密钥，你必须直接使用 Paramiko。pysftp 只是 Paramiko 周围的一个薄（和错误）包装器。
请注意，无论如何您都需要将 .ppk 密钥转换为 OpenSSH 格式。
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