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Thread: Linux files permission for FTP

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  1. Linux files permission for FTP

    We have one user created let's called it "USER_a" which is used to perform FTP command "get" files from other system into a directory, let's called it "Directory_a". We need the files permission that transferred into "Directory_a" to be change to "644" in order for the group member and others can read it. I have been told this can be done in vsftpd.conf but I have no experience in doing so. So can someone give me some guidance how to start? Because currently the files permission will be "600" when the "get" command complete.

    Thank you

  2. #2

    Re: Linux files permission for FTP

    Just to be clear, I presume on your Linux system (a Z system, or s390x, or
    something) that you are running the 'ftp' command to FTP into some other
    system and pull (download) files to the local system, since that is what
    'get' does, as opposed to what 'put' does.

    I ask for that clarification because you said somebody mentioned
    vsftpd.conf may help you, but while not an expert on vsftpd I believe that
    is only the FTP service, meaning the server side, so that would probably
    only apply for upload/put operations, not get operations.

    If correct in the assumptions above, I would next check things like your
    umask setting for your user. For example if it is 066 or something like
    that then I would expect the resulting files to be as you describe them,
    with 0600 permissions. On the other hand, if not then perhaps something
    about your 'ftp 'command changes its umask when it starts.

    Here are some commands to run; please post the output:

    Code:
    #Get the current umask:
    umask
    
    #Create a file outside of the 'ftp' command:
    touch touched-file
    ls -l touched-file
    
    #Do a test via FTP;  note the indented FTP commands
    ftp whatever.server.goes.here
    > get whatever-file-here
    > bye
    ls -l whatever-file-here
    The results there may give us some clues. On the other hand if you are
    putting/uploading files (to the server), then none of this matters and we
    need to get back to vsftpd.conf or something on that side of things.


    --
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  3. Re: Linux files permission for FTP

    Hi ab,

    Thank you for the quick reply and sorry for not mentioning about the SUSE server. The SUSE server is installed on IBM LinuxOne machine.
    It seem to be some misunderstanding on our side. I mentioned in the previous post that we performed "get/download" operation but the truth is we are performing "put/upload" operation.
    The other system will use "put/upload" operation into a directory named "Directory_a" in our SUSE server using a user named "USER_a". We have tested by created a file with permission 644, but after perform the ftp "put", the permission change to 600.

    As per your request to ran a command to check on the umask value, please check as following:

    USER_a@SUSE_A:~> umask
    0002
    USER_a@SUSE_A:~> touch testing_create_file.txt
    USER_a@SUSE_A:~> ls -l
    -rw-rw-r-- 1 USER_a oinstall 0 Oct 28 12:54 testing_create_file.txt

    This is the current vsftpd.conf
    Code:
    # Example config file /etc/vsftpd.conf
    #
    # The default compiled in settings are fairly paranoid. This sample file
    # loosens things up a bit, to make the ftp daemon more usable.
    # Please see vsftpd.conf.5 for all compiled in defaults.
    #
    # If you do not change anything here you will have a minimum setup for an
    # anonymus FTP server.
    #
    # READ THIS: This example file is NOT an exhaustive list of vsftpd options.
    # Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
    # capabilities.
    
    # General Settings
    #
    # Uncomment this to enable any form of FTP write command.
    #
    #write_enable=YES
    #
    # Activate directory messages - messages given to remote users when they
    # go into a certain directory.
    #
    dirmessage_enable=YES
    #
    # It is recommended that you define on your system a unique user which the
    # ftp server can use as a totally isolated and unprivileged user.
    #
    nopriv_user=ftpsecure
    #
    # You may fully customise the login banner string:
    #
    #ftpd_banner="Welcome to FOOBAR FTP service."
    #
    # You may activate the "-R" option to the builtin ls. This is disabled by
    # default to avoid remote users being able to cause excessive I/O on large
    # sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
    # the presence of the "-R" option, so there is a strong case for enabling it.
    #
    #ls_recurse_enable=YES
    #
    # You may specify a file of disallowed anonymous e-mail addresses. Apparently
    # useful for combatting certain DoS attacks.
    #
    #deny_email_enable=YES
    #
    # (default follows)
    #
    #banned_email_file=/etc/vsftpd.banned_emails
    #
    # If  enabled,  all  user  and  group  information in
    # directory listings will be displayed as "ftp".
    #
    #hide_ids=YES
    
    # Local FTP user Settings
    # 
    # Uncomment this to allow local users to log in.
    #
    #local_enable=YES
    #
    # Default umask for local users is 077. You may wish to change this to 022,
    # if your users expect that (022 is used by most other ftpd's)
    #
    #local_umask=022
    #
    # Uncomment to put local users in a chroot() jail in their home directory
    # after login.
    #
    #chroot_local_user=YES
    #
    # You may specify an explicit list of local users to chroot() to their home
    # directory. If chroot_local_user is YES, then this list becomes a list of
    # users to NOT chroot().
    #
    #chroot_list_enable=YES
    #
    # (default follows)
    #
    #chroot_list_file=/etc/vsftpd.chroot_list
    #
    # The maximum data transfer rate permitted, in bytes per second, for
    # local authenticated users. The default is 0 (unlimited).
    #
    #local_max_rate=7200
    
    
    # Anonymus FTP user Settings
    #
    # Allow anonymous FTP?
    #
    anonymous_enable=YES
    #
    # Anonymous users will only be allowed to download files which are
    # world readable.
    #
    anon_world_readable_only=YES
    #
    # Uncomment this to allow the anonymous FTP user to upload files. This only
    # has an effect if the above global write enable is activated. Also, you will
    # obviously need to create a directory writable by the FTP user.
    #
    #anon_upload_enable=YES
    #
    # Default umask for anonymus users is 077. You may wish to change this to 022,
    # if your users expect that (022 is used by most other ftpd's)
    #
    anon_umask=002
    #
    # Uncomment this if you want the anonymous FTP user to be able to create
    # new directories.
    #
    #anon_mkdir_write_enable=YES
    #
    # Uncomment this to enable anonymus FTP users to perform other write operations
    # like deletion and renaming.
    #
    #anon_other_write_enable=YES
    #
    # If you want, you can arrange for uploaded anonymous files to be owned by
    # a different user. Note! Using "root" for uploaded files is not
    # recommended!
    #
    #chown_uploads=YES
    #chown_username=whoever
    #
    # The maximum data transfer rate permitted, in bytes per second, for anonymous
    # authenticated users. The default is 0 (unlimited).
    #
    #anon_max_rate=7200
    
    
    # Log Settings
    #
    # Log to the syslog daemon instead of using an logfile.
    #
    syslog_enable=NO
    #
    # Uncomment this to log all FTP requests and responses.
    #
    #log_ftp_protocol=YES
    #
    # Activate logging of uploads/downloads.
    #
    #xferlog_enable=YES
    #
    # You may override where the log file goes if you like. The default is shown
    # below.
    #
    #vsftpd_log_file=/var/log/vsftpd.log
    # 
    # If you want, you can have your log file in standard ftpd xferlog format.
    # Note: This disables the normal logging unless you enable dual_log_enable below. 
    #
    #xferlog_std_format=YES
    #
    # You may override where the log file goes if you like. The default is shown
    # below.
    #
    #xferlog_file=/var/log/xferlog
    #
    # Enable this to have booth logfiles. Standard xferlog and vsftpd's own style log.
    #
    #dual_log_enable=YES
    #
    # Uncomment this to enable session status information in the system process listing.
    #
    #setproctitle_enable=YES
    
    # Transfer Settings
    #
    # Make sure PORT transfer connections originate from port 20 (ftp-data).
    #
    connect_from_port_20=YES
    #
    # You may change the default value for timing out an idle session.
    #
    #idle_session_timeout=600
    #
    # You may change the default value for timing out a data connection.
    #
    #data_connection_timeout=120
    #
    # Enable this and the server will recognise asynchronous ABOR requests. Not
    # recommended for security (the code is non-trivial). Not enabling it,
    # however, may confuse older FTP clients.
    #
    #async_abor_enable=YES
    #
    # By default the server will pretend to allow ASCII mode but in fact ignore
    # the request. Turn on the below options to have the server actually do ASCII
    # mangling on files when in ASCII mode.
    # Beware that turning on ascii_download_enable enables malicious remote parties
    # to consume your I/O resources, by issuing the command "SIZE /big/file" in
    # ASCII mode.
    # These ASCII options are split into upload and download because you may wish
    # to enable ASCII uploads (to prevent uploaded scripts etc. from breaking),
    # without the DoS risk of SIZE and ASCII downloads. ASCII mangling should be
    # on the client anyway..
    #
    #ascii_upload_enable=YES
    #ascii_download_enable=YES
    #
    # Set to NO if you want to disallow the  PASV  method of obtaining a data
    # connection.
    #
    #pasv_enable=NO
    
    # PAM setting. Do NOT change this unless you know what you do!
    #
    pam_service_name=vsftpd
    
    # Set listen=YES if you want vsftpd to run standalone
    #
    listen=YES
    
    # Set to ssl_enable=YES if you want to enable SSL
    ssl_enable=NO
    
    # Limit passive ports to this range to assis firewalling
    pasv_min_port=30000
    pasv_max_port=30100
    anon_mkdir_write_enable=NO
    anon_root=/srv/ftp
    anon_upload_enable=NO
    #anon_umask=002
    chroot_local_user=NO
    ftpd_banner=Welcome message
    idle_session_timeout=900
    local_enable=YES
    log_ftp_protocol=NO
    max_clients=10
    max_per_ip=3
    pasv_enable=YES
    ssl_sslv2=NO
    ssl_sslv3=NO
    ssl_tlsv1=YES
    write_enable=YES
    
    #The permissions with which uploaded files are created. Umasks are applied on top of this value. You may wish to change to 0777 if you want uploaded files to be executable.
    #Default: 0666
    
    file_open_mode=0666

  4. #4

    Re: Linux files permission for FTP

    Try uncommenting this local_umask value, restarting your vsftpd service,
    and then testing again.

    On 12/11/2017 10:04 PM, mohd tarmizi wrote:
    > # Default umask for local users is 077. You may wish to change this to 022,
    > # if your users expect that (022 is used by most other ftpd's)
    > #
    > #local_umask=022


    --
    Good luck.

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  5. Re: Linux files permission for FTP

    Hi ab,

    Finally it work after done some reading searching all over the net. What we do is change these 4 lines:

    1) anon_upload_enable=YES
    2) anon_mkdir_write_enable=YES
    3) file_open_mode=0644
    4) local_umask=002

    Then, restart the vsftpd service and it work as desired.

    Hopefully this will help others.

    Thank you

  6. #6

    Re: Linux files permission for FTP

    I am glad to hear it is working, and particularly thank-you for sharing
    your results for the reason you mentioned.

    --
    Good luck.

    If you find this post helpful and are logged into the web interface,
    show your appreciation and click on the star below.

    If you want to send me a private message, please let me know in the
    forum as I do not use the web interface often.

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