Security-Enhanced Linux secures the gpg_agent processes via flexible mandatory access control.
The gpg_agent processes execute with the gpg_agent_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_agent_t
The gpg_agent_t SELinux type can be entered via the gpg_agent_exec_t file type.
The default entrypoint paths for the gpg_agent_t domain are the following:
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux gpg_agent policy is very flexible allowing users to setup their gpg_agent processes in as secure a method as possible.
The following process types are defined for gpg_agent:
gpg_agent_t
Note: semanage permissive -a gpg_agent_t can be used to make the process type gpg_agent_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
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
The SELinux process type gpg_agent_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
ecryptfs_t
/home/[^/]+/.Private(/.*)?
/home/[^/]+/.ecryptfs(/.*)?
fusefs_t
/var/run/user/[^/]*/gvfs
gnome_home_type
gpg_agent_tmp_t
/home/[^/]+/.gnupg/log-socket
gpg_agent_tmpfs_t
gpg_secret_t
/root/.gnupg(/.+)?
/etc/mail/spamassassin/sa-update-keys(/.*)?
/home/[^/]+/.gnupg(/.+)?
nfs_t
user_home_t
/home/[^/]+/.+
user_tmp_type
all user tmp files
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 gpg_agent policy is very flexible allowing users to setup their gpg_agent processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the gpg_agent, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t gpg_agent_tmpfs_t '/srv/mygpg_agent_content(/.*)?'
restorecon -R -v /srv/mygpg_agent_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for gpg_agent:
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_agent_tmpfs_t
- Set files with the gpg_agent_tmpfs_t type, if you want to store gpg agent files on a tmpfs file system.
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.
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.