NAME¶

ssh_keysign_selinux - Security Enhanced Linux Policy for the ssh_keysign processes

DESCRIPTION¶

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

The ssh_keysign processes execute with the ssh_keysign_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 ssh_keysign_t

ENTRYPOINTS¶

The ssh_keysign_t SELinux type can be entered via the ssh_keysign_exec_t file type.

The default entrypoint paths for the ssh_keysign_t domain are the following:

/usr/lib/openssh/ssh-keysign, /usr/libexec/openssh/ssh-keysign

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

The following process types are defined for ssh_keysign:

ssh_keysign_t

Note: semanage permissive -a ssh_keysign_t can be used to make the process type ssh_keysign_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. ssh_keysign policy is extremely flexible and has several booleans that allow you to manipulate the policy and run ssh_keysign with the tightest access possible.

If you want to allow host key based authentication, you must turn on the ssh_keysign boolean. Disabled by default.

setsebool -P ssh_keysign 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 any process to mmap any file on system with attribute file_type, you must turn on the domain_can_mmap_files boolean. Enabled by default.

setsebool -P domain_can_mmap_files 1

If you want to allow all domains write to kmsg_device, while kernel is executed with systemd.log_target=kmsg parameter, you must turn on the domain_can_write_kmsg boolean. Disabled by default.

setsebool -P domain_can_write_kmsg 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 allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Disabled by default.

setsebool -P nscd_use_shm 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 ssh_keysign policy is very flexible allowing users to setup their ssh_keysign processes in as secure a method as possible.

The following file types are defined for ssh_keysign:

ssh_keysign_exec_t

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

Paths:

/usr/lib/openssh/ssh-keysign, /usr/libexec/openssh/ssh-keysign

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