Mailman 3 December 2016 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince March 3, 2022

March 3, 2022

I am plannig to upgrade twisted's buildbot in the near future. In preperation for that, I am going to take down the production buildbot on Tuesday, June 26, around 1600 UTC[1]. During that time, the result of any builds done will be lost. Thus, I'd ask that people avoid committing to trunk during that time. I will send a reminder before I take down the buildbot both here, and on #twisted and #twisted-dev. Tom [1] http://timeanddate.com/worldclock/meetingtime.html?iso=20120626&p1=80&p2=22…

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[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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May 1, 2019

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[Twisted-Python] "twistd" in Twisted 16.4.0 can't import modules/packages from current working directory
by Yuri Feb. 14, 2017

Feb. 14, 2017

Hi all I couldn't find Twisted-specific group, so posting here. Recently Twisted 16.4.0 got released. Yesterday I've tried to upgrade it for my apps and got an error. I've created simple example, which demonstrates it. File service.tac: ======================================= import os from twisted.application import service, internet import mymodule application = service.Application("Demo application") ---------------------------------------- File mymodule.py: ======================================== def myfunction(asd): """ Stub function """ ---------------------------------------- If you try to run it with twistd -y service.tac you'll get an error: == output ============================== Unhandled Error Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 648, in run runApp(config) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/twistd.py", line 25, in runApp _SomeApplicationRunner(config).run() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 379, in run self.application = self.createOrGetApplication() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 444, in createOrGetApplication application = getApplication(self.config, passphrase) --- <exception caught here> --- File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 455, in getApplication application = service.loadApplication(filename, style, passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/application/service.py", line 411, in loadApplication passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/persisted/sob.py", line 223, in loadValueFromFile eval(codeObj, d, d) File "service.tac", line 7, in <module> import mymodule exceptions.ImportError: No module named mymodule Failed to load application: No module named mymodule ---------------------------------------- The errors comes down to this: twistd script does not add current working directory to python path (or removes it, I don't know what exactly happens), so it fails to import any packages/modules from it. The issue does not appear in previous version (Twisted 16.3.2). Any ideas what caused it?

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[Twisted-Python] conch problem with ecdsa-sha2-nistp256 host key?
by Craig Rodrigues Jan. 21, 2017

Jan. 21, 2017

Hi, I filed this bug: https://twistedmatrix.com/trac/ticket/8931 At least for me, conch fails to parse a host key created by OpenSSH in ~/.ssh/known_hosts which is of type ecdsa-sha2-nistp256. Anyone have an idea as to how to fix this? -- Craig

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[Twisted-Python] Twisted 16.7.0rc1 Release Candidate Announcement
by Amber "Hawkie" Brown Jan. 3, 2017

Jan. 3, 2017

Hello everyone, and happy holidays! Although it didn't quite fall on the solstice, one could call this Twisted release a little ray of sunshine, with some nice new improvements. 16.7.0rc1 brings the following stocking stuffers: - twisted.web.client.Agent now supports IPv6! It's also now the primary web client in Twisted, with twisted.web.client.getPage being deprecated in favour of it and Treq. - twisted.internet.ssl.CertificateOptions has had its `method` argument deprecated, in favour of the new raiseMinimumTo, lowerMaximumSecurityTo, and insecurelyLowerMinimumTo arguments, which take TLSVersion arguments. This allows you to better give a range of versions of TLS you wish to negotiate, rather than forcing yourself to any one version. - twisted.internet.ssl.CertificateOptions will use OpenSSL's MODE_RELEASE_BUFFERS, which will let it free unused memory that was held by idle TLS connections. - You can now call the new twist runner with `python -m twisted`. - Conch has the beginnings of ECDH key exchange, and supports `hmac-sha2-384` in twisted.conch.ssh. - Better Unicode support in twisted.internet.reactor.spawnProcess, especially on Windows on Python 3.6. - More Python 3 porting in Conch, and more under-the-hood changes to facilitate a Twisted-wide jump to new-style classes only on Python 2 in 2018/2019. This release has also been tested on Python 3.6 on Linux. - Lots of deprecated code removals, to make a sleeker, less confusing Twisted. - 20+ closed tickets. You can get the tarball and the NEWS file at https://twistedmatrix.com/Releases/rc/16.7.0rc1/ <https://twistedmatrix.com/Releases/rc/16.7.0rc1/> , or you can try it out from PyPI: python -m pip install Twisted==16.7.0rc1 Please test it, and let me know how your applications fare, good or bad! If nothing comes up, 16.7 looks like it'll land just before the new year. With festive hoots, Amber Brown

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[Twisted-Python] AWS Auth v4 for Twisted?
by Jean-Paul Calderone Jan. 2, 2017

Jan. 2, 2017

Seeking a library that implements this for use with txAWS. More details: https://stackoverflow.com/questions/41322251/is-there-an-aws-auth-v4-implem… Jean-Paul

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[Twisted-Python] twisted.python.sendmsg segfault - looking for confirmation
by ex vito Dec. 30, 2016

Dec. 30, 2016

Dear all, While working on http://twistedmatrix.com/trac/ticket/8912 and the associated PR at https://github.com/twisted/twisted/pull/647 I hit a segmentation fault on a test I was preparing. I think narrowed it down Linux + Python 2, but I'm not 100% sure. Can anyone please confirm the code below segfaults on such environment? For completeness, from my tests, it works fine on Linux + Python 3, and fails with socket.error/OSError on Mac OS 10.9.5 + Python 2/3. No BSDs at hand to try out... As far as I can tell, no code in Twisted uses sendmsg in the way the code is using it. However, twisted.python.sendmsg is a public API so someone somewhere may hit this like I just did. Other than looking for confirmation, I have a fix which I included two isolated commits in the PR. Twisted project members: if this is confirmed, maybe a ticket should be created in Trac and an independent PR created, correct? Thanks in advance for any input. Regards, -- exvito -[ cut here ]---------------------------------------------------------------------- import os import socket import struct import sys from twisted.python import sendmsg if __name__ == '__main__': # This code segfaults when running with twisted/trunk commit # 98a3df200968b78bd3b985dfd4fb10a5b415d6fc on Linux Python 2 # due to a bug in src/twisted/python/_sendmsg.c and glibc's # CMSG_NXTHDR implementation. # get connected sockets s1, s2 = socket.socketpair(socket.AF_UNIX) # two CMSGs in ancillary data (no segfault with just one) ancillary = [ (socket.SOL_SOCKET, sendmsg.SCM_RIGHTS, struct.pack('i', s1.fileno())), (socket.SOL_SOCKET, sendmsg.SCM_RIGHTS, struct.pack('i', s2.fileno())), ] expected = { 2: 'Expecting to segfault.', 3: 'Should not segfault.', } print expected.get(sys.version_info.major, 'Unexpected Python version.') retval = sendmsg.sendmsg(s1, data=b'some data', ancillary=ancillary) print 'Did not segfault.' -[ cut here ]----------------------------------------------------------------------

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Re: [Twisted-Python] hmac-sha2-512 - Corrupted MAC on input with OpenSSH
by 陈健 Dec. 29, 2016

Dec. 29, 2016

hi, Yes, you are right. ssh -vv -oKexAlgorithms=diffie-hellman-group14-sha1 -oMACs=hmac-sha2-512 user@localhost against a Twisted ssh server, and i saw the problem. The reason is that twisted(16.6.0) is not supported the diffie-hellman-group14-sha1 and ecdh-sha512-nistp512 key exchange algorithms well, right ? -- JianChen At 2016-12-29 16:06:55, "Craig Rodrigues" <rodrigc(a)crodrigues.org> wrote: Abhishek Choudhary pointed out to me that you can reproduce this problem easily, even with OpenSSH client. Look at https://twistedmatrix.com/trac/ticket/8258 and do: ssh -vv -oKexAlgorithms=diffie-hellman-group14-sha1 -oMACs=hmac-sha2-512 user@localhost against a Twisted ssh server, and you will see the problem. -- Craig On Thu, Dec 29, 2016 at 1:17 AM, 陈健 <chenjianhappy2008(a)126.com> wrote: hi, Yes, your understanding is correct. I must set the hmac-sha2-512 option unable with SecureCRT, it will be OK. I searched Google for a long time, still did not find the any clues! Twisted Server + OpenSSH client == WORKS Twisted Server + Xshell client == WORKS OpenSSH Server + SecureCRT client == WORKS Twisted Server + SecureCRT client == FAIL -- JianChen 在 2016-12-29 12:35:57，"Craig Rodrigues" <rodrigc(a)crodrigues.org> 写道： Hi, Is this what you are saying: Twisted Server + OpenSSH client == WORKS Twisted Server + Xshell client == WORKS OpenSSH Server + SecureCRT client == WORKS Twisted Server + SecureCRT client == FAIL ?? I don't have SecureCRT client, so don't know the solution to this problem. You might want to try searching the SecureCRT site and see if there are any clues there: https://goo.gl/UkKZvI -- Craig On Wed, Dec 28, 2016 at 9:39 PM, 陈健 <chenjianhappy2008(a)126.com> wrote: hi: Oh, I'm sorry, It is my server-side code has bugs with Twisted(16.6.0) Conch, that i have fixed it . But 'Message Authentication Code did not verify (packet #3)' error will occurs with the SecureCRT(8.0.0 or 7.3.4) client. If I connect OpenSSH_5.3p1 (or OpenSSH_6.6.1p1 ) sshd server through the SecureCRT client, it is fine. Of course， if I connect Twisted SSH server by using the Xshell client with hmac-sha2-512 options or “ssh -m hmac-sha2-512”，it is OK. I do not know if it is SecureCRT client bug or twisted problem. http://stackoverflow.com/questions/41296412/securecrt-hmac-sha2-512-message…

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[Twisted-Python] hmac-sha2-512 - Corrupted MAC on input with OpenSSH
by 陈健 Dec. 29, 2016

Dec. 29, 2016

hi: | | I write a SSH server with Twisted(15.5.0) Conch. But it don't support hmac-sha2-512 MAC algorithms | . However I see this problem has been fixed in https://twistedmatrix.com/trac/ticket/8108 . I asked the question in http://stackoverflow.com/questions/41254398/twisted-hmac-sha2-512-corrupted… . Best regards, ---jianchen

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