gpg_agent_selinux man page

gpg_agent_selinux — Security Enhanced Linux Policy for the gpg_agent processes

Description

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

Entrypoints

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:

/usr/bin/gpg-agent

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 psbP

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.

Booleans

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

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 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_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

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 lsbP

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_tmp_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.

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.

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), gpg_agent(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)

Referenced By

gpg_selinux(8).

16-11-29 gpg_agent SELinux Policy gpg_agent