Mailman 3 June 2019 - Twisted

[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com June 16, 2019

June 16, 2019

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[Twisted-Python] Returning Failure when requestAvatarID to indicate a failed login is not working for me
by Thomas Westfeld June 12, 2019

June 12, 2019

Dear all, I am experiencing a problem with a custom credential checker for twisted cred based on an external server. @defer.inlineCallbacks def requestAvatarId(self, credentials): user = <query external server with credentials> try: # Check password with external server, raises InvalidCredentials error # if successful return user entry user_entry = yield checkCredentialsWithExternalServer(user, credentials.password) defer.returnValue(user_entry) except InvalidCredentials: self.log.debug("Invalid password for username {user}", user=user_entry.dn.getText()) defer.returnValue(Failure(error.UnauthorizedLogin("username/password is wrong"))) My problem is, that the Failure in the last line does not trigger the Errback of the deferred of the calling method to signal that the login failed. I also tried to raise the error but this does not work for me. I also tried to return a defer.fail(error.UnauthorizedLogin()). This is what the requestAvatarID method documentation (https://github.com/twisted/twisted/blob/f9e12bd88618682f7cdba342fbaea121207…) says about the return value @return: a Deferred which will fire a string which identifies an avatar, an empty tuple to specify an authenticated anonymous user (provided as checkers.ANONYMOUS) or fire a Failure(UnauthorizedLogin). Alternatively, return the result itself. I am now a bit puzzled that it could be problematic, because the @inlineCallbacks decorator makes the function itself return a deferred already. It would be great to have an inlineCallbacked method as getAvatarID method, because I am doing some networking calls in it which are all returning deferreds. Do I have to rewrite the getAvatarID implementation to not use inlineCallbacks? Any help is appreciated, Thomas

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[Twisted-Python] Conch question regarding command execution status
by Sereysethy TOUCH June 11, 2019

June 11, 2019

Hi, I have a question regarding conch ssh connection. I opened a channel to an ssh server, my requirement is to know when can I submit my next command after the first command execution finished. Is there a way to check that the command execution finished in case that there is no data received? Is there an exit_status or an ACK? I read the SSH RFC (https://tools.ietf.org/html/rfc4254#section-6.10) there is a returning exit status (even it is optionnel), twisted conch implements this? Thanks, Sethy

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[Twisted-Python] Binary wheels for Twisted on Windows?
by Griatch Art June 9, 2019

June 9, 2019

Hi, I'm investigating installing the Evennia MU* server on Windows. We use Twisted and will be requiring Python3.7 in our next release. I need to make easy-to-use install instructions since a lot of Windows users use our library. I tested with a Windows7 64bit VM and installed everything from scratch to emulate what a non-dev Windows user would see. I don't have Windows10 so can't compare to the install experience there (but Windows7 64bit is still relevant, having something like 24% of the active Windows user-base according to Steam). Using pip to install Evennia, at the Twisted requirement install step I run into an error telling me that I need "Microsoft Visual C++ build tools" from the URL https://visualstudio.microsoft.com/downloads. The first issue is that there does not appear to be any build-tools package named like that on that page or sub-page (at least not what I could find after digging around). I tried to install a few similarly-named packages, like "Visual Studio Build Tools", but had no luck getting past the Twisted install point. So that recommendation-string should likely be updated. The thing is though, while I could probably personally figure out how to set it up eventually, our Windows users are likely the least tech-savvy of our users. Requiring them to set up a compiler environment (despite us telling them that Python code does not need compilation) a bit too much. It seems Twisted has distributed binary Windows wheels in the past, would it be possible to get them again? Or should I recommend some other, specific install procedure for our Windows users? Cheers, Griatch, Evennia dev

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com June 9, 2019

June 9, 2019

1 0

[Twisted-Python] [SECURITY] Twisted 19.2.1 Release Announcement
by Amber Brown June 6, 2019

June 6, 2019

On behalf of Twisted Matrix Laboratories, I am honoured to announce the release of Twisted 19.2.1! This is a security release, and contains the following changes: - All HTTP clients in twisted.web.client now raise a ValueError when called with a method and/or URL that contain invalid characters. This mitigates CVE-2019-12387. Thanks to Alex Brasetvik for reporting this vulnerability. It is recommended you update to this release as soon as is practical. Additional mitigation may be required if Twisted is not your only HTTP client library: - This bug is present in all current versions of urllib2 in CPython. More information can be found on the Python bug tracker: https://bugs.python.org/issue30458 - This bug was present in urllib3 up until version 1.24.3. More information can be found on the urllib3 bug tracker: https://github.com/urllib3/urllib3/issues/1553 You can find the downloads at <https://pypi.python.org/pypi/Twisted> (or alternatively <http://twistedmatrix.com/trac/wiki/Downloads>). The NEWS file is also available at <https://github.com/twisted/twisted/blob/twisted-19.2.1/NEWS.rst>. Twisted Regards, Amber Brown (HawkOwl)

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com June 2, 2019

June 2, 2019

1 0