ftpd_selinux(8) ftpd SELinux Policy documentation ftpd_selinux(8)NAMEftpd_selinux - Security Enhanced Linux Policy for the ftpd processes
DESCRIPTION
Security-Enhanced Linux secures the ftpd processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. ftpd
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run ftpd with the tightest access possible.
If you want to allow ftp to read and write files in the user home
directorie, you must turn on the ftp_home_dir boolean.
setsebool -P ftp_home_dir 1
If you want to allow ftp servers to login to local users and read/write
all files on the system, governed by DAC, you must turn on the
allow_ftpd_full_access boolean.
setsebool -P allow_ftpd_full_access 1
If you want to allow ftp servers to connect to mysql database port, you
must turn on the ftpd_connect_db boolean.
setsebool -P ftpd_connect_db 1
If you want to allow ftp servers to use cifs used for public file
transfer services, you must turn on the allow_ftpd_use_cifs boolean.
setsebool -P allow_ftpd_use_cifs 1
If you want to allow ftp servers to use nfs used for public file trans‐
fer services, you must turn on the allow_ftpd_use_nfs boolean.
setsebool -P allow_ftpd_use_nfs 1
If you want to allow sftp-internal to read and write files in the user
home directorie, you must turn on the sftpd_enable_homedirs boolean.
setsebool -P sftpd_enable_homedirs 1
If you want to allow httpd to act as a FTP client connecting to the ftp
port and ephemeral port, you must turn on the httpd_can_connect_ftp
boolean.
setsebool -P httpd_can_connect_ftp 1
If you want to allow ftp servers to use bind to all unreserved ports
for passive mod, you must turn on the ftpd_use_passive_mode boolean.
setsebool -P ftpd_use_passive_mode 1
If you want to allow internal-sftp to read and write files in the user
ssh home directories, you must turn on the sftpd_write_ssh_home bool‐
ean.
setsebool -P sftpd_write_ssh_home 1
If you want to allow sftp-internal to login to local users and
read/write all files on the system, governed by DAC, you must turn on
the sftpd_full_access boolean.
setsebool -P sftpd_full_access 1
If you want to allow ftp servers to connect to all ports > 102, you
must turn on the ftpd_connect_all_unreserved boolean.
setsebool -P ftpd_connect_all_unreserved 1
If you want to allow httpd to act as a FTP server by listening on the
ftp port, you must turn on the httpd_enable_ftp_server boolean.
setsebool -P httpd_enable_ftp_server 1
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the ftpd_t,
you must turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
ftpd_t, you must turn on the allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the ftpd_t, you must
turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 1
SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync,
Samba), you can set a file context of public_content_t and public_con‐
tent_rw_t. These context allow any of the above domains to read the
content. If you want a particular domain to write to the public_con‐
tent_rw_t domain, you must set the appropriate boolean.
Allow ftpd servers to read the /var/ftpd directory by adding the pub‐
lic_content_t file type to the directory and by restoring the file
type.
semanage fcontext -a -t public_content_t "/var/ftpd(/.*)?"
restorecon -F -R -v /var/ftpd
Allow ftpd 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_ftpdd_anon_write boolean to be set.
semanage fcontext -a -t public_content_rw_t "/var/ftpd/incoming(/.*)?"
restorecon -F -R -v /var/ftpd/incoming
If you want to allow tftp to modify public files used for public file
transfer services., you must turn on the tftp_anon_write boolean.
setsebool -P tftp_anon_write 1
If you want to allow ftp servers to upload files, used for public file
transfer services. Directories must be labeled public_content_rw_t.,
you must turn on the allow_ftpd_anon_write boolean.
setsebool -P allow_ftpd_anon_write 1
If you want to allow anon internal-sftp to upload files, used for pub‐
lic file transfer services, directories must be labeled public_con‐
tent_rw_t., you must turn on the sftpd_anon_write boolean.
setsebool -P sftpd_anon_write 1
FILE CONTEXTS
SELinux requires files to have an extended attribute to define the file
type.
You can see the context of a file using the -Z option to ls
Policy governs the access confined processes have to these files.
SELinux ftpd policy is very flexible allowing users to setup their ftpd
processes in as secure a method as possible.
The following file types are defined for ftpd:
ftpd_etc_t
- Set files with the ftpd_etc_t type, if you want to store ftpd files
in the /etc directories.
ftpd_exec_t
- Set files with the ftpd_exec_t type, if you want to transition an
executable to the ftpd_t domain.
Paths:
/usr/sbin/ftpwho, /etc/cron.monthly/proftpd, /usr/sbin/in.ftpd,
/usr/sbin/proftpd, /usr/kerberos/sbin/ftpd, /usr/sbin/muddleftpd,
/usr/sbin/vsftpd
ftpd_initrc_exec_t
- Set files with the ftpd_initrc_exec_t type, if you want to transition
an executable to the ftpd_initrc_t domain.
Paths:
/etc/rc.d/init.d/proftpd, /etc/rc.d/init.d/vsftpd
ftpd_keytab_t
- Set files with the ftpd_keytab_t type, if you want to treat the files
as kerberos keytab files.
ftpd_lock_t
- Set files with the ftpd_lock_t type, if you want to treat the files
as ftpd lock data, stored under the /var/lock directory
ftpd_tmp_t
- Set files with the ftpd_tmp_t type, if you want to store ftpd tempo‐
rary files in the /tmp directories.
ftpd_tmpfs_t
- Set files with the ftpd_tmpfs_t type, if you want to store ftpd files
on a tmpfs file system.
ftpd_unit_file_t
- Set files with the ftpd_unit_file_t type, if you want to treat the
files as ftpd unit content.
ftpd_var_run_t
- Set files with the ftpd_var_run_t type, if you want to store the ftpd
files under the /run directory.
ftpdctl_exec_t
- Set files with the ftpdctl_exec_t type, if you want to transition an
executable to the ftpdctl_t domain.
ftpdctl_tmp_t
- Set files with the ftpdctl_tmp_t type, if you want to store ftpdctl
temporary files in the /tmp directories.
Note: File context can be temporarily modified with the chcon command.
If you want to permanantly change the file context you need to use the
semanage fcontext command. This will modify the SELinux labeling data‐
base. You will need to use restorecon to apply the labels.
PORT TYPES
SELinux defines port types to represent TCP and UDP ports.
You can see the types associated with a port by using the following
command:
semanage port -l
Policy governs the access confined processes have to these ports.
SELinux ftpd policy is very flexible allowing users to setup their ftpd
processes in as secure a method as possible.
The following port types are defined for ftpd:
ftp_data_port_t
Default Defined Ports:
tcp 20
ftp_port_t
Default Defined Ports:
tcp 21,990
udp 990
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
Policy governs the access confined processes have to files. SELinux
ftpd policy is very flexible allowing users to setup their ftpd pro‐
cesses in as secure a method as possible.
The following process types are defined for ftpd:
ftpd_t, ftpdctl_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process
type permissive. Permissive process types are not denied access by
SELinux. AVC messages will still be generated.
COMMANDS
semanage fcontext can also be used to manipulate default file context
mappings.
semanage permissive can also be used to manipulate whether or not a
process type is permissive.
semanage module can also be used to enable/disable/install/remove pol‐
icy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genman.py.
SEE ALSOselinux(8), ftpd(8), semanage(8), restorecon(8), chcon(1) , setse‐
bool(8)dwalsh@redhat.com ftpd ftpd_selinux(8)
