initial commit of ssh.

[people/stevee/selinux-policy.git] / refpolicy / policy / modules / services / ssh.te

policy_module(ssh,1.0)

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

# Allow ssh logins as sysadm_r:sysadm_t
bool ssh_sysadm_login false;

# Allow ssh to run from inetd instead of as a daemon.
bool run_ssh_inetd false;

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

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

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

# ssh server executable
type sshd_exec_t;
files_file_type(sshd_exec_t)

type sshd_key_t;
files_file_type(sshd_key_t)

type sshd_tmp_t;
files_tmp_file(sshd_tmp_t)

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

sshd_program_domain(sshd)

allow sshd_t sshd_tmp_t:dir create_dir_perms;
allow sshd_t sshd_tmp_t:file create_file_perms;
allow sshd_t sshd_tmp_t:sock_file create_file_perms;
files_create_tmp_files(sshd_t, sshd_tmp_t, { dir file sock_file })

# for X forwarding
corenet_tcp_bind_xserver_port(sshd_t)

auth_exec_pam(sshd_t)

seutil_read_config(sshd_t)

ifdef(`TODO',`
if (ssh_sysadm_login) {
	userdom_spec_domtrans_all_users(sshd_t)
	userdom_signal_all_users(sshd_t)

	ifdef(`xauth.te',`
		domain_trans(sshd_t, xauth_exec_t, 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 ptyfile:chr_file { relabelto read write getattr ioctl setattr };
	# inheriting stream sockets is needed for "ssh host command" as no pty
	# is allocated
	allow userdomain sshd_t:unix_stream_socket rw_stream_socket_perms;
} else {
	userdom_spec_domtrans_unpriv_users(sshd_t)
	userdom_signal_unpriv_users(sshd_t)

	ifdef(`xauth.te',`
		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 };
	# inheriting stream sockets is needed for "ssh host command" as no pty
	# is allocated
	allow userdomain sshd_t:unix_stream_socket rw_stream_socket_perms;
}

# for when the network connection breaks after running newrole -r sysadm_r
dontaudit sshd_t sysadm_devpts_t:chr_file setattr;

# Allow checking users mail at login
allow sshd_t { var_spool_t mail_spool_t }:dir search;
allow sshd_t mail_spool_t:lnk_file read;
allow sshd_t mail_spool_t:file getattr;
') dnl endif TODO

#################################
#
# sshd_extern local policy
#
# sshd_extern_t is the domain for ssh from outside our network
#
ifdef(`TODO',`
sshd_program_domain(sshd_extern)

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(`inetd.te',`
	if (run_ssh_inetd) {
		allow inetd_t ssh_port_t:tcp_socket name_bind;
		domain_auto_trans(inetd_t, sshd_exec_t, sshd_t)
		domain_trans(inetd_t, sshd_exec_t, sshd_extern_t)
	} else {
		domain_auto_trans(initrc_t, sshd_exec_t, sshd_t)
		domain_trans(initrc_t, sshd_exec_t, sshd_extern_t)
		dontaudit initrc_t sshd_key_t:file { getattr read };
	}
',`
	# These rules should match the else block
	# of the run_ssh_inetd conditional directly above
	domain_auto_trans(initrc_t, sshd_exec_t, sshd_t)
	domain_trans(initrc_t, sshd_exec_t, sshd_extern_t)
	dontaudit initrc_t sshd_key_t:file { getattr read };
')

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;
')

# so a tunnel can point to another ssh tunnel...
allow sshd_t self:tcp_socket { acceptfrom connectto recvfrom };
allow sshd_t kernel_t:tcp_socket recvfrom;
allow sshd_t kernel_t:tcp_socket recvfrom;

# for port forwarding
allow userdomain sshd_t:tcp_socket { connectto recvfrom };
allow sshd_t userdomain:tcp_socket { acceptfrom recvfrom };
allow userdomain kernel_t:tcp_socket recvfrom;
allow sshd_t kernel_t:tcp_socket recvfrom;
') 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 create_file_perms;
files_create_etc_config(ssh_keygen_t,sshd_key_t,file)

kernel_read_kernel_sysctl(ssh_keygen_t)

dev_read_sysfs(ssh_keygen_t)
dev_read_urand(ssh_keygen_t)

term_dontaudit_use_console(ssh_keygen_t)

domain_use_wide_inherit_fd(ssh_keygen_t)

files_read_generic_etc_files(ssh_keygen_t)

init_use_fd(ssh_keygen_t)
init_use_script_pty(ssh_keygen_t)

libs_use_ld_so(ssh_keygen_t)
libs_use_shared_libs(ssh_keygen_t)

logging_send_syslog_msg(ssh_keygen_t)

allow ssh_keygen_t proc_t:dir r_dir_perms;
allow ssh_keygen_t proc_t:lnk_file read;

userdom_use_sysadm_tty(ssh_keygen_t)
userdom_dontaudit_use_unpriv_user_fd(ssh_keygen_t)

ifdef(`direct_sysadm_daemon',`
	userdom_dontaudit_use_sysadm_terms(ssh_keygen_t)
')

ifdef(`targeted_policy', `
	term_dontaudit_use_unallocated_tty(ssh_keygen_t)
	term_dontaudit_use_generic_pty(ssh_keygen_t)
	files_dontaudit_read_root_file(ssh_keygen_t)
')

optional_policy(`rhgb.te', `
	rhgb_domain(ssh_keygen_t)
')

optional_policy(`selinux.te',`
	seutil_newrole_sigchld(ssh_keygen_t)
')

optional_policy(`udev.te', `
	udev_read_db(ssh_keygen_t)
')

ifdef(`TODO',`
allow ssh_keygen_t autofs_t:dir { search getattr };
')