[man-page] ftpd_selinux

出处

https://mgrepl.fedorapeople.org/man_selinux/Fedora18/ftpd.html

说明

最近部署vsftpd服务时遇到开启chroot后不在chroot_list内的账号登录ftp服务器报 "500 OOPS: chroot" 错误的问题,

使用man查询ftpd相关的selinux手册时找不到任何结果

最后在fedora的页面找到相关资料, 故作记录.

笔者处理问题的方法是

setsebool -P ftpd_full_access 1

---

NAME

ftpd_selinux - Security Enhanced Linux Policy for the ftpd processes  

DESCRIPTION

Security-Enhanced Linux secures the ftpd processes via flexible mandatory 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 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

 

NSSWITCH DOMAIN

 

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

 

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_content_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_content_rw_t domain, you must set the appropriate boolean.

Allow ftpd servers to read the /var/ftpd 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/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 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

 

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 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.

 

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 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 userestorecon 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 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