Security-Enhanced Linux secures the ftpd processes via flexible mandatory access control.
If you want to allow ftp to read and write files in the user home directories, you must turn on the ftp_home_dir boolean.
setsebool -P ftp_home_dir 1
If you want to allow ftp servers to use cifs used for public file transfer services, you must turn on the ftpd_use_cifs boolean.
setsebool -P ftpd_use_cifs 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 boolean.
setsebool -P sftpd_write_ssh_home 1
If you want to allow ftp servers to connect to mysql database ports, you must turn on the ftpd_connect_db boolean.
setsebool -P ftpd_connect_db 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 ftpd_full_access boolean.
setsebool -P ftpd_full_access 1
If you want to allow sftp-internal to read and write files in the user home directories, 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 ports, 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 mode, you must turn on the ftpd_use_passive_mode boolean.
setsebool -P ftpd_use_passive_mode 1
If you want to allow ftp servers to use nfs used for public file transfer services, you must turn on the ftpd_use_nfs boolean.
setsebool -P ftpd_use_nfs 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 > 1023, 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
If you want to allow users to resolve user passwd entries directly from ldap rather then 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 kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
semanage fcontext -a -t public_content_t "/var/ftpd(/.*)?"
restorecon -F -R -v /var/ftpd
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 ftpd_anon_write boolean.
setsebool -P ftpd_anon_write 1
If you want to allow anon internal-sftp to upload files, used for public file transfer services. Directories must be labeled public_content_rw_t., you must turn on the sftpd_anon_write boolean.
setsebool -P sftpd_anon_write 1
You can see the context of a file using the -Z option to lsP 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.
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.
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 temporary 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 permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
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:
Default Defined Ports: tcp 20
Default Defined Ports: tcp 21,990 udp 990
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux ftpd policy is very flexible allowing users to setup their ftpd processes in as secur