selinux-policy/policy/modules/services/ssh.te

policy_module(ssh, 1.10.0)

########################################
#
# Declarations
#

## <desc>
## <p>
## allow host key based authentication
## </p>
## </desc>
gen_tunable(allow_ssh_keysign, false)

## <desc>
## <p>
## Allow ssh logins as sysadm_r:sysadm_t
## </p>
## </desc>
gen_tunable(ssh_sysadm_login, false)

attribute ssh_server;

# Type for the ssh-agent executable.
type ssh_agent_exec_t;
files_type(ssh_agent_exec_t)

# ssh client executable.
type ssh_exec_t;
application_executable_file(ssh_exec_t)

type ssh_keygen_t;
type ssh_keygen_exec_t;
init_system_domain(ssh_keygen_t, ssh_keygen_exec_t)
role system_r types ssh_keygen_t;

type ssh_keysign_exec_t;
application_executable_file(ssh_keysign_exec_t)

type sshd_exec_t;
corecmd_executable_file(sshd_exec_t)

ssh_server_template(sshd)
init_daemon_domain(sshd_t, sshd_exec_t)

ssh_server_template(sshd_extern)

type sshd_key_t;
files_type(sshd_key_t)

type sshd_tmp_t;
files_tmp_file(sshd_tmp_t)
files_poly_parent(sshd_tmp_t)

ifdef(`enable_mcs',`
	init_ranged_daemon_domain(sshd_t,sshd_exec_t,s0 - mcs_systemhigh)
')

#################################
#
# sshd local policy
#
# sshd_t is the domain for the sshd program.
#

# so a tunnel can point to another ssh tunnel
allow sshd_t self:netlink_route_socket r_netlink_socket_perms;
allow sshd_t self:key { search link write };

manage_dirs_pattern(sshd_t, sshd_tmp_t, sshd_tmp_t)
manage_files_pattern(sshd_t, sshd_tmp_t, sshd_tmp_t)
manage_sock_files_pattern(sshd_t, sshd_tmp_t, sshd_tmp_t)
files_tmp_filetrans(sshd_t, sshd_tmp_t, { dir file sock_file })

kernel_search_key(sshd_t)
kernel_link_key(sshd_t)

# for X forwarding
corenet_tcp_bind_xserver_port(sshd_t)
corenet_sendrecv_xserver_server_packets(sshd_t)

tunable_policy(`ssh_sysadm_login',`
	# Relabel and access ptys created by sshd
	# ioctl is necessary for logout() processing for utmp entry and for w to
	# display the tty.
	# some versions of sshd on the new SE Linux require setattr
	term_use_all_user_ptys(sshd_t)
	term_setattr_all_user_ptys(sshd_t)
	term_relabelto_all_user_ptys(sshd_t)

	userdom_spec_domtrans_all_users(sshd_t)
	userdom_signal_all_users(sshd_t)
',`
	userdom_spec_domtrans_unpriv_users(sshd_t)
	userdom_signal_unpriv_users(sshd_t)

	userdom_setattr_unpriv_users_ptys(sshd_t)
	userdom_relabelto_unpriv_users_ptys(sshd_t)
	userdom_use_unpriv_users_ptys(sshd_t)
')

optional_policy(`
	daemontools_service_domain(sshd_t, sshd_exec_t)
')

optional_policy(`
	inetd_tcp_service_domain(sshd_t, sshd_exec_t)
')

optional_policy(`
	rpm_use_script_fds(sshd_t)
')

optional_policy(`
	rssh_spec_domtrans_all_users(sshd_t)
	# For reading /home/user/.ssh
	rssh_read_all_users_ro_content(sshd_t)
')

optional_policy(`
	unconfined_domain(sshd_t)
	unconfined_shell_domtrans(sshd_t)
')

ifdef(`TODO',`
tunable_policy(`ssh_sysadm_login',`
	# Relabel and access ptys created by sshd
	# ioctl is necessary for logout() processing for utmp entry and for w to
	# display the tty.
	# some versions of sshd on the new SE Linux require setattr
	allow sshd_t ptyfile:chr_file relabelto;

	optional_policy(`
		domain_trans(sshd_t, xauth_exec_t, userdomain)
	')
',`
	optional_policy(`
		domain_trans(sshd_t, xauth_exec_t, unpriv_userdomain)
	')
	# Relabel and access ptys created by sshd
	# ioctl is necessary for logout() processing for utmp entry and for w to
	# display the tty.
	# some versions of sshd on the new SE Linux require setattr
	allow sshd_t userpty_type:chr_file { relabelto read write getattr ioctl setattr };
')
') dnl endif TODO

#################################
#
# sshd_extern local policy
#
# sshd_extern_t is the domain for ssh from outside our network
#

ifdef(`TODO',`
domain_trans(initrc_t, sshd_exec_t, sshd_extern_t)

domain_trans(sshd_extern_t, shell_exec_t, user_mini_domain)
# Signal the user domains.
allow sshd_extern_t user_mini_domain:process signal;

ifdef(`xauth.te', `
domain_trans(sshd_extern_t, xauth_exec_t, user_mini_domain)
')

# Relabel and access ptys created by sshd
# ioctl is necessary for logout() processing for utmp entry and for w to
# display the tty.
# some versions of sshd on the new SE Linux require setattr
allow sshd_extern_t user_mini_domain:chr_file { relabelto read write getattr ioctl setattr };

# inheriting stream sockets is needed for "ssh host command" as no pty
# is allocated
allow user_mini_domain sshd_extern_t:unix_stream_socket rw_stream_socket_perms;

optional_policy(`
	domain_trans(inetd_t, sshd_exec_t, sshd_extern_t)
')

ifdef(`direct_sysadm_daemon', `
# Direct execution by sysadm_r.
domain_auto_trans(sysadm_t, sshd_exec_t, sshd_t)
role_transition sysadm_r sshd_exec_t system_r;
')
') dnl endif TODO

########################################
#
# ssh_keygen local policy
#

# ssh_keygen_t is the type of the ssh-keygen program when run at install time
# and by sysadm_t

dontaudit ssh_keygen_t self:capability sys_tty_config;
allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };

allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;

allow ssh_keygen_t sshd_key_t:file manage_file_perms;
files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)

kernel_read_kernel_sysctls(ssh_keygen_t)

fs_search_auto_mountpoints(ssh_keygen_t)

dev_read_sysfs(ssh_keygen_t)
dev_read_urand(ssh_keygen_t)

term_dontaudit_use_console(ssh_keygen_t)

domain_use_interactive_fds(ssh_keygen_t)

files_read_etc_files(ssh_keygen_t)

init_use_fds(ssh_keygen_t)
init_use_script_ptys(ssh_keygen_t)

libs_use_ld_so(ssh_keygen_t)
libs_use_shared_libs(ssh_keygen_t)

logging_send_syslog_msg(ssh_keygen_t)

userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)

optional_policy(`
	nscd_socket_use(ssh_keygen_t)
')

optional_policy(`
	seutil_sigchld_newrole(ssh_keygen_t)
')

optional_policy(`
	udev_read_db(ssh_keygen_t)
')