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python ftplib and TLS, issues with data connection

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I need to connect to a (possibly misconfigured) FTP server which only accepts TLS connections.

I'm using FTP_TLS from ftplib. I can connect, authenticate and list files.
When I try to upload files, I get a 534 error.

I get the very same behaviour with lftp, but in lftp I can work around this issue, with this flag:

set ftp:ssl-protect-data true

In python, I've tried FTP_TLS.prot_p() but without luck.

Any suggestions?

python python-3.x ssl ftplib

share|improve this question

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

add a comment | 

0

I need to connect to a (possibly misconfigured) FTP server which only accepts TLS connections.

I'm using FTP_TLS from ftplib. I can connect, authenticate and list files.
When I try to upload files, I get a 534 error.

I get the very same behaviour with lftp, but in lftp I can work around this issue, with this flag:

set ftp:ssl-protect-data true

In python, I've tried FTP_TLS.prot_p() but without luck.

Any suggestions?

python python-3.x ssl ftplib

share|improve this question

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

add a comment | 

I need to connect to a (possibly misconfigured) FTP server which only accepts TLS connections.

I'm using FTP_TLS from ftplib. I can connect, authenticate and list files.
When I try to upload files, I get a 534 error.

I get the very same behaviour with lftp, but in lftp I can work around this issue, with this flag:

set ftp:ssl-protect-data true

In python, I've tried FTP_TLS.prot_p() but without luck.

Any suggestions?

python python-3.x ssl ftplib

share|improve this question

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

set ftp:ssl-protect-data true

share|improve this question

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

share|improve this question

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

asked Mar 27 at 10:21

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

1 Answer
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1

I've found the cause of the problem: the server is an IIS server and it seems that ftplib has some issues with ISS - or maybe it's IIS that has some "special needs" that ftplib doesn't takes care of.

• https://www.kodfor.com/Automating-file-transfer-via-FTP-over-TLS-using-Python


• https://www.sami-lehtinen.net/blog/python-32-ms-ftps-ssl-tls-lockup-fix

I had to subclass the FTP_TLS class and override the storbinary method:

class iisFTP_TLS(ftplib.FTP_TLS):
 ssl_version=ssl.PROTOCOL_TLS
 def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None):
 """Store a file in binary mode. A new port is created for you.

 Args:
 cmd: A STOR command.
 fp: A file-like object with a read(num_bytes) method.
 blocksize: The maximum data size to read from fp and send over
 the connection at once. [default: 8192]
 callback: An optional single parameter callable that is called on
 each block of data after it is sent. [default: None]
 rest: Passed to transfercmd(). [default: None]

 Returns:
 The response code.
 """
 self.voidcmd('TYPE I')
 with self.transfercmd(cmd, rest) as conn:
 while 1:
 buf = fp.read(blocksize)
 if not buf:
 break
 conn.sendall(buf)
 if callback:
 callback(buf)
 ## shutdown ssl layer
 #if _SSLSocket is not None and isinstance(conn, _SSLSocket):
 # conn.unwrap()
 return self.voidresp()

share|improve this answer

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

add a comment | 

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1

I've found the cause of the problem: the server is an IIS server and it seems that ftplib has some issues with ISS - or maybe it's IIS that has some "special needs" that ftplib doesn't takes care of.

• https://www.kodfor.com/Automating-file-transfer-via-FTP-over-TLS-using-Python


• https://www.sami-lehtinen.net/blog/python-32-ms-ftps-ssl-tls-lockup-fix

I had to subclass the FTP_TLS class and override the storbinary method:

class iisFTP_TLS(ftplib.FTP_TLS):
 ssl_version=ssl.PROTOCOL_TLS
 def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None):
 """Store a file in binary mode. A new port is created for you.

 Args:
 cmd: A STOR command.
 fp: A file-like object with a read(num_bytes) method.
 blocksize: The maximum data size to read from fp and send over
 the connection at once. [default: 8192]
 callback: An optional single parameter callable that is called on
 each block of data after it is sent. [default: None]
 rest: Passed to transfercmd(). [default: None]

 Returns:
 The response code.
 """
 self.voidcmd('TYPE I')
 with self.transfercmd(cmd, rest) as conn:
 while 1:
 buf = fp.read(blocksize)
 if not buf:
 break
 conn.sendall(buf)
 if callback:
 callback(buf)
 ## shutdown ssl layer
 #if _SSLSocket is not None and isinstance(conn, _SSLSocket):
 # conn.unwrap()
 return self.voidresp()

share|improve this answer

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

add a comment | 

1

I've found the cause of the problem: the server is an IIS server and it seems that ftplib has some issues with ISS - or maybe it's IIS that has some "special needs" that ftplib doesn't takes care of.

• https://www.kodfor.com/Automating-file-transfer-via-FTP-over-TLS-using-Python


• https://www.sami-lehtinen.net/blog/python-32-ms-ftps-ssl-tls-lockup-fix

I had to subclass the FTP_TLS class and override the storbinary method:

class iisFTP_TLS(ftplib.FTP_TLS):
 ssl_version=ssl.PROTOCOL_TLS
 def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None):
 """Store a file in binary mode. A new port is created for you.

 Args:
 cmd: A STOR command.
 fp: A file-like object with a read(num_bytes) method.
 blocksize: The maximum data size to read from fp and send over
 the connection at once. [default: 8192]
 callback: An optional single parameter callable that is called on
 each block of data after it is sent. [default: None]
 rest: Passed to transfercmd(). [default: None]

 Returns:
 The response code.
 """
 self.voidcmd('TYPE I')
 with self.transfercmd(cmd, rest) as conn:
 while 1:
 buf = fp.read(blocksize)
 if not buf:
 break
 conn.sendall(buf)
 if callback:
 callback(buf)
 ## shutdown ssl layer
 #if _SSLSocket is not None and isinstance(conn, _SSLSocket):
 # conn.unwrap()
 return self.voidresp()

share|improve this answer

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

add a comment | 

I've found the cause of the problem: the server is an IIS server and it seems that ftplib has some issues with ISS - or maybe it's IIS that has some "special needs" that ftplib doesn't takes care of.

• https://www.kodfor.com/Automating-file-transfer-via-FTP-over-TLS-using-Python


• https://www.sami-lehtinen.net/blog/python-32-ms-ftps-ssl-tls-lockup-fix

I had to subclass the FTP_TLS class and override the storbinary method:

class iisFTP_TLS(ftplib.FTP_TLS):
 ssl_version=ssl.PROTOCOL_TLS
 def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None):
 """Store a file in binary mode. A new port is created for you.

 Args:
 cmd: A STOR command.
 fp: A file-like object with a read(num_bytes) method.
 blocksize: The maximum data size to read from fp and send over
 the connection at once. [default: 8192]
 callback: An optional single parameter callable that is called on
 each block of data after it is sent. [default: None]
 rest: Passed to transfercmd(). [default: None]

 Returns:
 The response code.
 """
 self.voidcmd('TYPE I')
 with self.transfercmd(cmd, rest) as conn:
 while 1:
 buf = fp.read(blocksize)
 if not buf:
 break
 conn.sendall(buf)
 if callback:
 callback(buf)
 ## shutdown ssl layer
 #if _SSLSocket is not None and isinstance(conn, _SSLSocket):
 # conn.unwrap()
 return self.voidresp()

share|improve this answer

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

class iisFTP_TLS(ftplib.FTP_TLS):
 ssl_version=ssl.PROTOCOL_TLS
 def storbinary(self, cmd, fp, blocksize=8192, callback=None, rest=None):
 """Store a file in binary mode. A new port is created for you.

 Args:
 cmd: A STOR command.
 fp: A file-like object with a read(num_bytes) method.
 blocksize: The maximum data size to read from fp and send over
 the connection at once. [default: 8192]
 callback: An optional single parameter callable that is called on
 each block of data after it is sent. [default: None]
 rest: Passed to transfercmd(). [default: None]

 Returns:
 The response code.
 """
 self.voidcmd('TYPE I')
 with self.transfercmd(cmd, rest) as conn:
 while 1:
 buf = fp.read(blocksize)
 if not buf:
 break
 conn.sendall(buf)
 if callback:
 callback(buf)
 ## shutdown ssl layer
 #if _SSLSocket is not None and isinstance(conn, _SSLSocket):
 # conn.unwrap()
 return self.voidresp()

share|improve this answer

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges

answered Mar 27 at 10:38

SimoneLazzarisSimoneLazzaris

26911 silver badge77 bronze badges