09-14-2011
Well, there is a facility called chroot, or ftp server settings, that can make their home dir the root of their view. The latter protection sometimes fails when the user adds a symlink like: ~/root to /
You could give them the same facilities in a web tool, and not mess with nasty old ftp. I just uploaded my resume on comcast home with a nice web 2.0 tool they provide. FTP is very old and a challenge to firewalls and NAT with IP addresses in the message flow and multiple connections in both directions.
BTW, sftp and scp are just ssh in a compatible wrapper. They run on different servers, are secure, do not use multiple connection, connections in both directions or IP addresses inside message flow. They are secure and usually offer compression. I like scp, one line not reams of scripted steps. Their forerunners rlogin/rsh/rcp had security and design problems, and so fell into disrepute, but have no encryption overhead.
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LEARN ABOUT OPENSOLARIS
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)