gpg_selinux(8) - Linux man page

Name

gpg_selinux - Security Enhanced Linux Policy for the gpg processes

Description

Security-Enhanced Linux secures the gpg processes via flexible mandatory access control.

The gpg processes execute with the gpg_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 gpg_t

Entrypoints

The gpg_t SELinux type can be entered via the "gpg_exec_t" file type. The default entrypoint paths for the gpg_t domain are the following:"

/usr/lib(64)?/gnupg/.*, /usr/bin/gpg(2)?, /usr/bin/kgpg

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 gpg policy is very flexible allowing users to setup their gpg processes in as secure a method as possible.

The following process types are defined for gpg:

gpg_t, gpg_pinentry_t, gpg_helper_t, gpg_web_t, gpg_agent_t

Note: semanage permissive -a gpg_t

can be used to make the process type gpg_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

Booleans

SELinux policy is customizable based on least access required. gpg policy is extremely flexible and has several booleans that allow you to manipulate the policy and run gpg with the tightest access possible.

If you want to allow httpd to run gpg in gpg-web domain, you must turn on the httpd_use_gpg boolean.

setsebool -P httpd_use_gpg 1

If you want to allow usage of the gpg-agent --write-env-file option. This also allows gpg-agent to manage user files, you must turn on the gpg_agent_env_file boolean.

setsebool -P gpg_agent_env_file 1

If you want to allow httpd to run gpg in gpg-web domain, you must turn on the httpd_use_gpg boolean.

setsebool -P httpd_use_gpg 1

If you want to allow usage of the gpg-agent --write-env-file option. This also allows gpg-agent to manage user files, you must turn on the gpg_agent_env_file boolean.

setsebool -P gpg_agent_env_file 1

If you want to allow gpg web domain to modify public files used for public file transfer services, you must turn on the gpg_web_anon_write boolean.

setsebool -P gpg_web_anon_write 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 gpg servers to read the /var/gpg 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/gpg(/.*)?" restorecon -F -R -v /var/gpg
Allow gpg 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_gpgd_anon_write boolean to be set.
semanage fcontext -a -t public_content_rw_t "/var/gpg/incoming(/.*)?"
restorecon -F -R -v /var/gpg/incoming
If you want to allow gpg web domain to modify public files used for public file transfer services., you must turn on the gpg_web_anon_write boolean.
setsebool -P gpg_web_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 gpg policy is very flexible allowing users to setup their gpg processes in as secure a method as possible.

The following file types are defined for gpg:

gpg_agent_exec_t

- Set files with the gpg_agent_exec_t type, if you want to transition an executable to the gpg_agent_t domain.

gpg_agent_tmp_t

- Set files with the gpg_agent_tmp_t type, if you want to store gpg agent temporary files in the /tmp directories.

gpg_exec_t

- Set files with the gpg_exec_t type, if you want to transition an executable to the gpg_t domain.

gpg_helper_exec_t

- Set files with the gpg_helper_exec_t type, if you want to transition an executable to the gpg_helper_t domain.

gpg_pinentry_tmp_t

- Set files with the gpg_pinentry_tmp_t type, if you want to store gpg pinentry temporary files in the /tmp directories.

gpg_pinentry_tmpfs_t

- Set files with the gpg_pinentry_tmpfs_t type, if you want to store gpg pinentry files on a tmpfs file system.

gpg_secret_t

- Set files with the gpg_secret_t type, if you want to treat the files as gpg se secret data.

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.

Managed Files

The SELinux process type gpg_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.

etc_mail_t

/etc/mail(/.*)?

gpg_agent_tmp_t
gpg_secret_t

/root/.gnupg(/.+)?

/home/[^/]*/.gnupg(/.+)?

initrc_tmp_t
mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

mozilla_home_t

/home/[^/]*/.java(/.*)?

/home/[^/]*/.galeon(/.*)?

/home/[^/]*/.mozilla(/.*)?

/home/[^/]*/.phoenix(/.*)?

/home/[^/]*/.netscape(/.*)?

/home/[^/]*/.thunderbird(/.*)?

nfs_t
tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

user_home_t

/home/[^/]*/.+

user_tmp_t

/tmp/gconfd-.*

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 by mgrepl.