12-03-2007
how to deny someone to use ftp command ?
hi,all, i have a question to trouble you.
a workstation named AAA, and open the ftp services to permit user download and upload files. i have root password.
a pc install windows 2k named BBB, someone install a serv-u ftp ( a ftp server software ) to transfer data. i don't have the administrators password.
On BBB:
user can use: ftp AAA to transfer data, i permit.
but i don't permit on AAA to use ftp BBB to transfer data.
i can delete the ftp command or chmod 500, but someone could also upload a ftp command. or rename ftp to another name.
so, i want to know how to deny someone use ftp on AAA ?
anyone can help me.
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LEARN ABOUT SUSE
ftpd_selinux
ftpd_selinux(8) ftpd SELinux policy documentation ftpd_selinux(8)
NAME
ftpd_selinux - Security-Enhanced Linux policy for ftp daemons.
DESCRIPTION
Security-Enhanced Linux provides security for ftp daemons via flexible mandatory access control.
FILE_CONTEXTS
SELinux requires files to have a file type. File types may be specified with semanage and are restored with restorecon. Policy governs the
access that daemons have to files.
Allow ftp servers to read the /var/ftp directory by adding the public_content_t file type to the directory and by restoring the file type.
semanage fcontext -a -t public_content_t "/var/ftp(/.*)?"
restorecon -F -R -v /var/ftp
Allow ftp servers to read and write /var/tmp/incoming by adding the public_content_rw_t type to the directory and by restoring the file
type. This also requires the allow_ftpd_anon_write boolean to be set.
semanage fcontext -a -t public_content_rw_t "/var/ftp/incoming(/.*)?"
restorecon -F -R -v /var/ftp/incoming
BOOLEANS
SELinux policy is based on least privilege required and may also be customizable by setting a boolean with setsebool.
Allow ftp servers to read and write files with the public_content_rw_t file type.
setsebool -P allow_ftpd_anon_write on
Allow ftp servers to read or write files in the user home directories.
setsebool -P ftp_home_dir on
Allow ftp servers to read or write all files on the system.
setsebool -P allow_ftpd_full_access on
Allow ftp servers to use cifs for public file transfer services.
setsebool -P allow_ftpd_use_cifs on
Allow ftp servers to use nfs for public file transfer services.
setsebool -P allow_ftpd_use_nfs on
system-config-selinux is a GUI tool available to customize SELinux policy settings.
AUTHOR
This manual page was written by Dan Walsh <dwalsh@redhat.com>.
SEE ALSO
selinux(8), ftpd(8), setsebool(8), semanage(8), restorecon(8)
dwalsh@redhat.com 17 Jan 2005 ftpd_selinux(8)