Re: [Fab-user] Fabric suddenly no longer working

[Jeff Forcier]

If you check out the traceback, it's actually coming from the Cryptography library, not Paramiko itself. I'd double check whether perhaps an upgraded version of that library might be the trigger?

Otherwise, nothing about this jumps out at me with an obvious cause (you're doing very normal things & it looks like it's code paths taken by the test suite & almost all users all the time), so try the usual things:

- doublecheck what changed in your environment around the time of the error

- switch up some dependency versions (eg try an older Paramiko, Cryptography or maybe even OpenSSL, if that's easy to do) to see if the behavior stops with one of them

- search around Cryptography's issue tracker (https://github.com/pyca/cryptography/issues) in case you find a hit (I briefly search and didn't find anything, but it was extremely brief!)

- post more details about your latest setup (output of `pip list`, etc) in case someone else notices a clue

Good luck,

Jeff

On Mon, Jul 23, 2018 at 2:26 PM, Rob Marshall <address@hidden> wrote:

Hi,

I think this may be because of a paramiko error I've started getting:

>>> import paramiko

>>> import os

>>> ssh = paramiko.SSHClient()

>>> ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

>>> ssh.load_host_keys(os.path.join(os.environ['HOME'],'.ssh','known_hosts'))

>>> ssh.connect('10.10.1.85',username='testuser01',password='TestPass01')

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/usr/local/lib/python2.7/dist-packages/paramiko/client.py", line 424, in connect

    passphrase,

  File "/usr/local/lib/python2.7/dist-packages/paramiko/client.py", line 652, in _auth

    self._transport.auth_publickey(username, key))

  File "/usr/local/lib/python2.7/dist-packages/paramiko/transport.py", line 1446, in auth_publickey

    self.auth_handler.auth_publickey(username, key, my_event)

  File "/usr/local/lib/python2.7/dist-packages/paramiko/auth_handler.py", line 103, in auth_publickey

    self._request_auth()

  File "/usr/local/lib/python2.7/dist-packages/paramiko/auth_handler.py", line 165, in _request_auth

    self.transport._send_message(m)

  File "/usr/local/lib/python2.7/dist-packages/paramiko/transport.py", line 1707, in _send_message

    self.packetizer.send_message(data)

  File "/usr/local/lib/python2.7/dist-packages/paramiko/packet.py", line 385, in send_message

    out = self.__block_engine_out.update(packet)

  File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/primitives/ciphers/base.py", line 149, in update

    return self._ctx.update(data)

  File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 120, in update

    n = self.update_into(data, buf)

  File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/ciphers.py", line 131, in update_into

    "unsigned char *", self._backend._ffi.from_buffer(buf)

TypeError: from_buffer() cannot return the address of the raw string within a str or unicode or bytearray object

I've tried various "fixes" I found for Ubuntu 16.04 and Python 2.7 but none have fixed the problem.

Rob

On Mon, Jul 23, 2018 at 4:04 PM, Rob Marshall <address@hidden> wrote:

Hi,

Is there a way to get more debugging information out of Fabric? I am having problems doing even simple commands, e.g.:

address@hidden: [tools]$ python

Python 2.7.12 (default, Dec  4 2017, 14:50:18) 

[GCC 5.4.0 20160609] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from fabric.api import *

>>> with settings(warn_only=True,user='testuser01',password='TestPass01',prompt='assword',host_string='10.10.1.85'):

...   results = sudo('w')

... 

[10.10.1.85] sudo: w

address@hidden: [tools]$ 

As you an see, when I execute the command it crashes and I don't know why.

Thanks,

Rob

_______________________________________________
Fab-user mailing list
address@hidden
https://lists.nongnu.org/mailman/listinfo/fab-user

--

Jeff Forcier
Unix sysadmin; Python engineer
http://bitprophet.org