twistd FTP TAP server allow configuring user home folder from twistd CLI about twisted HOT 3 OPEN

Thanks for the report.

The default anonymous user is not allowed to upload files

see the source code

Is there any documentation for Twisted describing that the anonymous user has write access by default?

Regarding non-anonymous users, the current ftp TAP does not support custom home paths for non-anoymous users.

The twistd root is passes as the anonymous root, and the non anonmous user home directory is is harcoded to the default /home/$USERNAME

Is there any documentation for Twisted FTP application suggesting that this is supported?

I would consider this a feature request,

The current options for FTP tap are here

You can look into extending the code to support non-anonymous user home folder.

I am happy to review a PR for this.

I have updated the title of this issue to reflect the current issue.

FTP upload works... it just that you will need to store all the FTP user files inside a "/home/$USER/" directory

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Thank you for the quick feedback, it explains a lot.

Is there any documentation for Twisted describing that the anonymous user has write access by default?

I may have had wrong expectations what the CLI tool was about. Background: I wanted a minimal FTP server solution to test a client. Without the need to setup real system users etc. And in my opinion the tool implied this by allowing to pass users and passwords as arguments and supporting anonymous access. I would expect that support of anon uploads is the more obvious use case for a test server and not supporting it would be the thing that has to be documented. Differentiating between anonymous and user downloads and uploads respectively probably took explicit implementation work. And I don't really see why. The help segment warns that the tool is insecure, great, I want to do insecure things for testing.

Is there any documentation for Twisted FTP application suggesting that this is supported?

The help output says "define the root of the ftp-site" which to me implies I can choose the default path for file transfers
Also even if I run twistd -n ftp --auth file:pass.dat, write <user>:<password> of my local system user into the pass.dat (I would expect to be able to define arbitrary credentials here) and then use this non-anonymous user to upload or download via curl I still receive 530 access denied without any feedback on the tool side.

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I have never used the Twsited Application framework and TAP file.
I don't think this was explicitly designed for testing usage.

FTP anonymous is kind of a legacy implementation of a public download site.
I think it is expected to have read-only for anonymous FTP

If you want to write, you can create an user.

For testing , you can have something like this

-r = ftp.FTPRealm(config["root"])
+r = ftp.FTPRealm(anonymousRoot=config["root"], userHome="/tmp")

Then you will need to create /tmp/USERNAMES folder

The help output says "define the root of the ftp-site" which to me implies I can choose the default path for file transfers

Thanks. True.
It should say. "Defines the root of the anonymos site."

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