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Thread: vsftpd username length limit

  1. #1

    Default vsftpd username length limit

    Hi, I'm using suse 10.2 to run an e-commerce system. We supply goods via FTP, and our server, vsftpd 2.0.5 has it seems a pretty silly limit of 32 characters for the user name. This has become a major problem for me as the username we use is a combo of the customers email address + an invoice number.

    The average customers email address is not a problem. But every now and again we have a customer with a very long email address, and that breaks our system. I've seen builds of vsftpd for Redhat that have had this limit raised to 128 (which would be fine for us).

    Does anyone know if a newer build (2.0.6,7 etc) for SUSE also fixes this issue? And if so, where I can get the .rpm for this version from?

    Cheers

    Chris T

  2. #2
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    Default Re: vsftpd username length limit

    It doesn't look like it's fixed upstream so you may have to hack the source yourself. Don't know whether a simple edit of the .h file will work or if there are any side effects. Good luck. Let us know how you go.

    #404926 - vsftpd: defs.h limits the username length to 32 chars - Debian Bug report logs
    ftp://vsftpd.beasts.org/users/cevans....0.7/Changelog

  3. #3

    Default Re: vsftpd username length limit

    Ok, I've tried downloading and building vsftpd 2.0.5 from the dev site. Having got it to build, I've tried swapping out the bin file with my original, and then restarting the service. Service restarts as it should, but I cannot log in to the server (pw file is present and has been updated etc. If I swap back in the old bin and restart, I can login again).

    I know that after the build I am not getting like for like. I guess the config files for the build are not the same as those used for the SUSE build (not surprising really). I can see this as the binary is 90k in size, whilst the official SUSE rpm's bin is 140k. I'm obviously missing a chunk of code

    This being a can of worms, what would be ideal is if I could get hold of the actual source files that were used to build vsftpd 2.0.5 for SUSE 10.2/3. I literally only need to change one line in the defs.h file, and build. All else being the same, I should have a new bin with no 32 char limit for usernames (!).

    So, is there a location from which we can get hold of the source files for all SUSE releases?

    Cheers

    CT

  4. #4

    Default Re: vsftpd username length limit

    Anyone have an idea about this. Is there a place I can get the source for each app supplied with a certain distro i.e. I need the source files for vsftp in suse 10.2/3

    Cheers

    CT

  5. #5
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    Default Re: vsftpd username length limit

    The 10.3 repos should still be available. What you're looking for is the SRPM package corresponding to the most recent RPM. Then you have to unpack the SRPM, insert a patch into the spec file, and then rebuild the RPM from the new spec file.

    Sorry, don't have the source repo URL offhand. Maybe someone else has it off the top of the head.

  6. #6

    Default Re: vsftpd username length limit

    Sorry, could you give a little more info on this stage. I am not a total noob to Linux, but in terms of building, RPM, SRPMs ety I am...

    "Then you have to unpack the SRPM, insert a patch into the spec file, and then rebuild the RPM from the new spec file."

    I have the srpm for my version of VSFTPD, and I have "unpacked" it using alien (is this the correct method?). I have edited the defs.h file in the source folder (this is needed to fix my core problem with VSFTPD), but this is where my abilities run dry... Where do I go from here?

    Cheers

    CT

  7. #7
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    Default Re: vsftpd username length limit

    To unpack a SRPM, put it in /usr/src/packages/SRPMS, then run rpm -i foo.srpm It will deposit the source tarball and patches in /usr/src/packages/SOURCES.

    To build, cd to /usr/src/packages/SPECS, edit foo.spec to change the version number slightly, say add a suffix which are your initials.

    rpmbuild -bp foo.spec

    to prepare the sources by unpacking the archives and applying the patches. Then edit the source in /usr/src/packages/BUILD, and do:

    rpmbuild -bc foo.spec

    to compile. You can then find the modified binary under the BUILD directory.

    NB: If you ever rerun -bp, you will wipe out your changes, so make sure you have the patch saved somewhere else. See below.

    When you are satisfied that your diff works, then you prepare a patch which you then put in the SOURCES directory along with the original tarball and other patches, and reference this in the spec file so that it gets automatically applied. Then you can do:

    rpmbuild -bb

    to rebuild the RPM, which you will find under /usr/src/packages/RPMS/<arch>/ and

    rpmbuild -bs

    to rebuild the SRPM.

    To get the whole story, search for a tutorial on using rpm to build packages (sorry, don't have any bookmark to suggest to you).

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