sftpd_selinux(8) SELinux Policy sftpd sftpd_selinux(8)
NAME
sftpd_selinux - Security Enhanced Linux Policy for the sftpd processes
DESCRIPTION
Security-Enhanced Linux secures the sftpd processes via flexible mandatory access control.
The sftpd processes execute with the sftpd_t SELinux type. You can check if you have these processes running by executing the ps command
with the -Z qualifier.
For example:
ps -eZ | grep sftpd_t
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 sftpd policy is very flexible allowing users to setup their sftpd pro-
cesses in as secure a method as possible.
The following process types are defined for sftpd:
sftpd_t
Note: semanage permissive -a sftpd_t can be used to make the process type sftpd_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still generated.
BOOLEANS
SELinux policy is customizable based on least access required. sftpd policy is extremely flexible and has several booleans that allow you
to manipulate the policy and run sftpd with the tightest access possible.
If you want to determine whether sftpd-can read and write files in user home directories, you must turn on the sftpd_enable_homedirs bool-
ean. Disabled by default.
setsebool -P sftpd_enable_homedirs 1
If you want to determine whether sftpd-can login to local users and read and write all files on the system, governed by DAC, you must turn
on the sftpd_full_access boolean. Disabled by default.
setsebool -P sftpd_full_access 1
If you want to determine whether sftpd can read and write files in user ssh home directories, you must turn on the sftpd_write_ssh_home
boolean. Disabled by default.
setsebool -P sftpd_write_ssh_home 1
If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 1
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 1
If you want to support ecryptfs home directories, you must turn on the use_ecryptfs_home_dirs boolean. Disabled by default.
setsebool -P use_ecryptfs_home_dirs 1
If you want to support fusefs home directories, you must turn on the use_fusefs_home_dirs boolean. Disabled by default.
setsebool -P use_fusefs_home_dirs 1
If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Disabled by default.
setsebool -P use_nfs_home_dirs 1
If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1
MANAGED FILES
The SELinux process type sftpd_t can manage files labeled with the following file types. The paths listed are the default paths for these
file types. Note the processes UID still need to have DAC permissions.
cifs_t
non_security_file_type
user_home_t
/home/[^/]*/.+
user_tmp_t
/var/run/user(/.*)?
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/tmp/gconfd-.*
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 pub-
lic_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 pub-
lic_content_rw_t domain, you must set the appropriate boolean.
Allow sftpd servers to read the /var/sftpd 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/sftpd(/.*)?"
restorecon -F -R -v /var/sftpd
Allow sftpd servers to read and write /var/sftpd/incoming by adding the public_content_rw_t type to the directory and by restoring the file
type. You also need to turn on the sftpd_anon_write boolean.
semanage fcontext -a -t public_content_rw_t "/var/sftpd/incoming(/.*)?"
restorecon -F -R -v /var/sftpd/incoming
setsebool -P sftpd_anon_write 1
If you want to determine whether sftpd can modify public files used for public file transfer services. Directories/Files must be labeled
public_content_rw_t., you must turn on the sftpd_anon_write boolean.
setsebool -P sftpd_anon_write 1
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 policy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSO
selinux(8), sftpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)
sftpd 14-06-10 sftpd_selinux(8)