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How can I disable some commands in SFTP?


SFTP logging: is there a way?Where can I find logs for SFTP?Passwordless sftp upload commands not executed using a shell scriptHow to disable sftp for some users, but keep ssh enabled?Allow SFTP but disallow SSH?SSH - cannot start sftp-server when trying to force internal sftpDisable chmod in openssh-serverhow to create sftp accountHow to disable sftp access to user with ssh already disabled (user shell = /bin/false, but connection still works with sftp)How can I disable sftp temporarily without reloading the service?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;








2















How can I disable some commands in SFTP for my clients, like ln & symlink?



I've checked man sftp, but didn't find what I'm searching for.










share|improve this question






















  • This doesn't make much sense. Why do you want to do this?

    – Michael Hampton
    Mar 4 '17 at 3:32











  • As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

    – cerberus
    Mar 4 '17 at 4:15

















2















How can I disable some commands in SFTP for my clients, like ln & symlink?



I've checked man sftp, but didn't find what I'm searching for.










share|improve this question






















  • This doesn't make much sense. Why do you want to do this?

    – Michael Hampton
    Mar 4 '17 at 3:32











  • As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

    – cerberus
    Mar 4 '17 at 4:15













2












2








2


1






How can I disable some commands in SFTP for my clients, like ln & symlink?



I've checked man sftp, but didn't find what I'm searching for.










share|improve this question














How can I disable some commands in SFTP for my clients, like ln & symlink?



I've checked man sftp, but didn't find what I'm searching for.







sftp






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 4 '17 at 3:25









user134969user134969

1851313




1851313












  • This doesn't make much sense. Why do you want to do this?

    – Michael Hampton
    Mar 4 '17 at 3:32











  • As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

    – cerberus
    Mar 4 '17 at 4:15

















  • This doesn't make much sense. Why do you want to do this?

    – Michael Hampton
    Mar 4 '17 at 3:32











  • As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

    – cerberus
    Mar 4 '17 at 4:15
















This doesn't make much sense. Why do you want to do this?

– Michael Hampton
Mar 4 '17 at 3:32





This doesn't make much sense. Why do you want to do this?

– Michael Hampton
Mar 4 '17 at 3:32













As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

– cerberus
Mar 4 '17 at 4:15





As Michael Hampton said, this doesn't make sense. The only thing I can think to do is disallow access to those commands with Linux ACLs from the users that log onto your server via SFTP and/or, depending if you're running SFTP in a chroot jail, the specific user that is running SFTP.

– cerberus
Mar 4 '17 at 4:15










2 Answers
2






active

oldest

votes


















5














You did not specify, what SFTP server are you using. I'm assuming the OpenSSH.



The sftp-server (and the compatible internal-sftp) has the -P and -p switches to black/white list certain SFTP requests.



You can use them to disallow the symlink requests:



Subsystem sftp internal-sftp -P symlink





share|improve this answer

























  • I've tried this, but it doesn't work.

    – user134969
    Mar 4 '17 at 21:21






  • 2





    What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

    – Martin Prikryl
    Mar 5 '17 at 6:44











  • Doesn't work a specific user as it is not usable in a Match block

    – Erdal G.
    Aug 24 '17 at 12:44











  • @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

    – Martin Prikryl
    Aug 24 '17 at 12:49


















0














You can only pass args to the sftp command when using ForceCommand, not Subsystem. If you do what the other answer says, the -P arg will be silently ignored!



The correct way:



Subsystem sftp internal-sftp

ForceCommand internal-sftp -P symlink


(you possibly also want to put a Match block around the second line)






share|improve this answer

























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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    5














    You did not specify, what SFTP server are you using. I'm assuming the OpenSSH.



    The sftp-server (and the compatible internal-sftp) has the -P and -p switches to black/white list certain SFTP requests.



    You can use them to disallow the symlink requests:



    Subsystem sftp internal-sftp -P symlink





    share|improve this answer

























    • I've tried this, but it doesn't work.

      – user134969
      Mar 4 '17 at 21:21






    • 2





      What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

      – Martin Prikryl
      Mar 5 '17 at 6:44











    • Doesn't work a specific user as it is not usable in a Match block

      – Erdal G.
      Aug 24 '17 at 12:44











    • @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

      – Martin Prikryl
      Aug 24 '17 at 12:49















    5














    You did not specify, what SFTP server are you using. I'm assuming the OpenSSH.



    The sftp-server (and the compatible internal-sftp) has the -P and -p switches to black/white list certain SFTP requests.



    You can use them to disallow the symlink requests:



    Subsystem sftp internal-sftp -P symlink





    share|improve this answer

























    • I've tried this, but it doesn't work.

      – user134969
      Mar 4 '17 at 21:21






    • 2





      What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

      – Martin Prikryl
      Mar 5 '17 at 6:44











    • Doesn't work a specific user as it is not usable in a Match block

      – Erdal G.
      Aug 24 '17 at 12:44











    • @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

      – Martin Prikryl
      Aug 24 '17 at 12:49













    5












    5








    5







    You did not specify, what SFTP server are you using. I'm assuming the OpenSSH.



    The sftp-server (and the compatible internal-sftp) has the -P and -p switches to black/white list certain SFTP requests.



    You can use them to disallow the symlink requests:



    Subsystem sftp internal-sftp -P symlink





    share|improve this answer















    You did not specify, what SFTP server are you using. I'm assuming the OpenSSH.



    The sftp-server (and the compatible internal-sftp) has the -P and -p switches to black/white list certain SFTP requests.



    You can use them to disallow the symlink requests:



    Subsystem sftp internal-sftp -P symlink






    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Sep 12 '17 at 15:52

























    answered Mar 4 '17 at 6:30









    Martin PrikrylMartin Prikryl

    5,3642660




    5,3642660












    • I've tried this, but it doesn't work.

      – user134969
      Mar 4 '17 at 21:21






    • 2





      What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

      – Martin Prikryl
      Mar 5 '17 at 6:44











    • Doesn't work a specific user as it is not usable in a Match block

      – Erdal G.
      Aug 24 '17 at 12:44











    • @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

      – Martin Prikryl
      Aug 24 '17 at 12:49

















    • I've tried this, but it doesn't work.

      – user134969
      Mar 4 '17 at 21:21






    • 2





      What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

      – Martin Prikryl
      Mar 5 '17 at 6:44











    • Doesn't work a specific user as it is not usable in a Match block

      – Erdal G.
      Aug 24 '17 at 12:44











    • @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

      – Martin Prikryl
      Aug 24 '17 at 12:49
















    I've tried this, but it doesn't work.

    – user134969
    Mar 4 '17 at 21:21





    I've tried this, but it doesn't work.

    – user134969
    Mar 4 '17 at 21:21




    2




    2





    What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

    – Martin Prikryl
    Mar 5 '17 at 6:44





    What did you try? What does not work? What does it do instead? What version of OpenSSH are you using?

    – Martin Prikryl
    Mar 5 '17 at 6:44













    Doesn't work a specific user as it is not usable in a Match block

    – Erdal G.
    Aug 24 '17 at 12:44





    Doesn't work a specific user as it is not usable in a Match block

    – Erdal G.
    Aug 24 '17 at 12:44













    @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

    – Martin Prikryl
    Aug 24 '17 at 12:49





    @ErdalG. You are right. I've removed that part. You can use ForceCommand though (but that would disallow shell access, what you actually want to do anyway probably, if you want to limit what user can do).

    – Martin Prikryl
    Aug 24 '17 at 12:49













    0














    You can only pass args to the sftp command when using ForceCommand, not Subsystem. If you do what the other answer says, the -P arg will be silently ignored!



    The correct way:



    Subsystem sftp internal-sftp

    ForceCommand internal-sftp -P symlink


    (you possibly also want to put a Match block around the second line)






    share|improve this answer





























      0














      You can only pass args to the sftp command when using ForceCommand, not Subsystem. If you do what the other answer says, the -P arg will be silently ignored!



      The correct way:



      Subsystem sftp internal-sftp

      ForceCommand internal-sftp -P symlink


      (you possibly also want to put a Match block around the second line)






      share|improve this answer



























        0












        0








        0







        You can only pass args to the sftp command when using ForceCommand, not Subsystem. If you do what the other answer says, the -P arg will be silently ignored!



        The correct way:



        Subsystem sftp internal-sftp

        ForceCommand internal-sftp -P symlink


        (you possibly also want to put a Match block around the second line)






        share|improve this answer















        You can only pass args to the sftp command when using ForceCommand, not Subsystem. If you do what the other answer says, the -P arg will be silently ignored!



        The correct way:



        Subsystem sftp internal-sftp

        ForceCommand internal-sftp -P symlink


        (you possibly also want to put a Match block around the second line)







        share|improve this answer














        share|improve this answer



        share|improve this answer








        edited May 11 at 0:12









        womble

        86.3k18147205




        86.3k18147205










        answered May 10 at 23:32









        ruforufo

        312




        312



























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