## <summary>Secure shell client and server policy.</summary>

#######################################

## <summary>

##	Basic SSH client template.

## </summary>

## <desc>

##	

##	This template creates a derived domains which are used

##	for ssh client sessions.  A derived

##	type is also created to protect the user ssh keys.

##	

##	

##	This template was added for NX.

##	

## </desc>

## <param name="userdomain_prefix">

##	<summary>

##	The prefix of the domain (e.g., user

##	is the prefix for user_t).

##	</summary>

## </param>

## <param name="user_domain">

##	<summary>

##	The type of the domain.

##	</summary>

## </param>

## <param name="user_role">

##	<summary>

##	The role associated with the user domain.

##	</summary>

## </param>

#

template(`ssh_basic_client_template',`

	gen_require(`

		attribute ssh_server;

		type ssh_exec_t, sshd_key_t, sshd_tmp_t;

	')

	##############################

	#

	# Declarations

	#

	type $1_ssh_t;

	application_domain($1_ssh_t, ssh_exec_t)

	role $3 types $1_ssh_t;

	type $1_ssh_home_t;

	files_type($1_ssh_home_t)

	typealias $1_ssh_home_t alias $1_home_ssh_t;

	##############################

	#

	# Client local policy

	#

	allow $1_ssh_t self:capability { setuid setgid dac_override dac_read_search };

	allow $1_ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };

	allow $1_ssh_t self:fd use;

	allow $1_ssh_t self:fifo_file rw_fifo_file_perms;

	allow $1_ssh_t self:unix_dgram_socket { create_socket_perms sendto };

	allow $1_ssh_t self:unix_stream_socket { create_stream_socket_perms connectto };

	allow $1_ssh_t self:shm create_shm_perms;

	allow $1_ssh_t self:sem create_sem_perms;

	allow $1_ssh_t self:msgq create_msgq_perms;

	allow $1_ssh_t self:msg { send receive };

	allow $1_ssh_t self:tcp_socket create_stream_socket_perms;

	# for rsync

	allow $1_ssh_t $2:unix_stream_socket rw_socket_perms;

	allow $1_ssh_t $2:unix_stream_socket connectto;

	# Read the ssh key file.

	allow $1_ssh_t sshd_key_t:file read_file_perms;

	# Access the ssh temporary files.

	allow $1_ssh_t sshd_tmp_t:dir manage_dir_perms;

	allow $1_ssh_t sshd_tmp_t:file manage_file_perms;

	files_tmp_filetrans($1_ssh_t, sshd_tmp_t, { file dir })

	# Transition from the domain to the derived domain.

	domtrans_pattern($2, ssh_exec_t, $1_ssh_t)

	# inheriting stream sockets is needed for "ssh host command" as no pty

	# is allocated

	# cjp: should probably fix target to be an attribute for ssh servers

	# or "regular" (not special like sshd_extern_t) servers

	allow $2 ssh_server:unix_stream_socket rw_stream_socket_perms;

	# allow ps to show ssh

	ps_process_pattern($2, $1_ssh_t)

	# user can manage the keys and config

	manage_files_pattern($2, $1_ssh_home_t, $1_ssh_home_t)

	manage_lnk_files_pattern($2, $1_ssh_home_t, $1_ssh_home_t)

	manage_sock_files_pattern($2, $1_ssh_home_t, $1_ssh_home_t)

	# ssh client can manage the keys and config

	manage_files_pattern($1_ssh_t, $1_ssh_home_t, $1_ssh_home_t)

	read_lnk_files_pattern($1_ssh_t, $1_ssh_home_t, $1_ssh_home_t)

	# ssh servers can read the user keys and config

	allow ssh_server $1_ssh_home_t:dir list_dir_perms;

	read_files_pattern(ssh_server, $1_ssh_home_t, $1_ssh_home_t)

	read_lnk_files_pattern(ssh_server, $1_ssh_home_t, $1_ssh_home_t)

	kernel_read_kernel_sysctls($1_ssh_t)

	kernel_read_system_state($1_ssh_t)

	corenet_all_recvfrom_unlabeled($1_ssh_t)

	corenet_all_recvfrom_netlabel($1_ssh_t)

	corenet_tcp_sendrecv_generic_if($1_ssh_t)

	corenet_tcp_sendrecv_generic_node($1_ssh_t)

	corenet_tcp_sendrecv_all_ports($1_ssh_t)

	corenet_tcp_connect_ssh_port($1_ssh_t)

	corenet_sendrecv_ssh_client_packets($1_ssh_t)

	dev_read_urand($1_ssh_t)

	fs_getattr_all_fs($1_ssh_t)

	fs_search_auto_mountpoints($1_ssh_t)

	# run helper programs - needed eg for x11-ssh-askpass

	corecmd_exec_shell($1_ssh_t)

	corecmd_exec_bin($1_ssh_t)

	domain_use_interactive_fds($1_ssh_t)

	files_list_home($1_ssh_t)

	files_read_usr_files($1_ssh_t)

	files_read_etc_runtime_files($1_ssh_t)

	files_read_etc_files($1_ssh_t)

	files_read_var_files($1_ssh_t)

	auth_use_nsswitch($1_ssh_t)

	logging_send_syslog_msg($1_ssh_t)

	logging_read_generic_logs($1_ssh_t)

	miscfiles_read_localization($1_ssh_t)

	seutil_read_config($1_ssh_t)

	optional_policy(`

		kerberos_use($1_ssh_t)

	')

')

#######################################

## <summary>

##	The template to define a ssh server.

## </summary>

## <desc>

##	

##	This template creates a domains to be used for

##	creating a ssh server.  This is typically done

##	to have multiple ssh servers of different sensitivities,

##	such as for an internal network-facing ssh server, and

##	a external network-facing ssh server.

##	

## </desc>

## <param name="userdomain_prefix">

##	<summary>

##	The prefix of the server domain (e.g., sshd

##	is the prefix for sshd_t).

##	</summary>

## </param>

#

template(`ssh_server_template', `

	type $1_t, ssh_server;

	auth_login_pgm_domain($1_t)

	type $1_devpts_t;

	term_login_pty($1_devpts_t)

	type $1_tmpfs_t;

	files_tmpfs_file($1_tmpfs_t)

	type $1_var_run_t;

	files_pid_file($1_var_run_t)

	allow $1_t self:capability { kill sys_chroot sys_nice sys_resource chown dac_override fowner fsetid setgid setuid sys_tty_config };

	allow $1_t self:fifo_file rw_fifo_file_perms;

	allow $1_t self:process { signal getsched setsched setrlimit setexec setkeycreate };

	allow $1_t self:tcp_socket create_stream_socket_perms;

	allow $1_t self:udp_socket create_socket_perms;

	# ssh agent connections:

	allow $1_t self:unix_stream_socket create_stream_socket_perms;

	allow $1_t self:shm create_shm_perms;

	allow $1_t $1_devpts_t:chr_file { rw_chr_file_perms setattr getattr relabelfrom };

	term_create_pty($1_t, $1_devpts_t)

	manage_files_pattern($1_t, $1_tmpfs_t, $1_tmpfs_t)

	fs_tmpfs_filetrans($1_t, $1_tmpfs_t, file)

	allow $1_t $1_var_run_t:file manage_file_perms;

	files_pid_filetrans($1_t, $1_var_run_t, file)

	can_exec($1_t, sshd_exec_t)

	# Access key files

	allow $1_t sshd_key_t:file read_file_perms;

	kernel_read_kernel_sysctls($1_t)

	kernel_read_network_state($1_t)

	corenet_all_recvfrom_unlabeled($1_t)

	corenet_all_recvfrom_netlabel($1_t)

	corenet_tcp_sendrecv_generic_if($1_t)

	corenet_udp_sendrecv_generic_if($1_t)

	corenet_raw_sendrecv_generic_if($1_t)

	corenet_tcp_sendrecv_generic_node($1_t)

	corenet_udp_sendrecv_generic_node($1_t)

	corenet_raw_sendrecv_generic_node($1_t)

	corenet_udp_sendrecv_all_ports($1_t)

	corenet_tcp_sendrecv_all_ports($1_t)

	corenet_tcp_bind_generic_node($1_t)

	corenet_udp_bind_generic_node($1_t)

	corenet_tcp_bind_ssh_port($1_t)

	corenet_tcp_connect_all_ports($1_t)

	corenet_sendrecv_ssh_server_packets($1_t)

	fs_dontaudit_getattr_all_fs($1_t)

	auth_rw_login_records($1_t)

	auth_rw_faillog($1_t)

	corecmd_read_bin_symlinks($1_t)

	corecmd_getattr_bin_files($1_t)

	# for sshd subsystems, such as sftp-server.

	corecmd_getattr_bin_files($1_t)

	domain_interactive_fd($1_t)

	files_read_etc_files($1_t)

	files_read_etc_runtime_files($1_t)

	files_read_usr_files($1_t)

	logging_search_logs($1_t)

	miscfiles_read_localization($1_t)

	userdom_create_all_users_keys($1_t)

	userdom_dontaudit_relabelfrom_user_ptys($1_t)

	userdom_search_user_home_dirs($1_t)

	# Allow checking users mail at login

	mta_getattr_spool($1_t)

	tunable_policy(`use_nfs_home_dirs',`

		fs_read_nfs_files($1_t)

		fs_read_nfs_symlinks($1_t)

	')

	tunable_policy(`use_samba_home_dirs',`

		fs_read_cifs_files($1_t)

	')

	optional_policy(`

		kerberos_use($1_t)

		kerberos_manage_host_rcache($1_t)

	')

	optional_policy(`

		files_read_var_lib_symlinks($1_t)

		nx_spec_domtrans_server($1_t)

	')

')

########################################

## <summary>

##	Role access for ssh

## </summary>

## <param name="role_prefix">

##	<summary>

##	The prefix of the role (e.g., user

##	is the prefix for user_r).

##	</summary>

## </param>

## <param name="role">

##	<summary>

##	Role allowed access

##	</summary>

## </param>

## <param name="domain">

##	<summary>

##	User domain for the role

##	</summary>

## </param>

#

template(`ssh_role_template',`

	gen_require(`

		attribute ssh_server, ssh_agent_type;

		type ssh_t, ssh_exec_t, ssh_tmpfs_t, ssh_home_t;

		type ssh_agent_exec_t, ssh_keysign_t, ssh_tmpfs_t;

		type ssh_agent_tmp_t;

	')

	##############################

	#

	# Declarations

	#

	role $2 types ssh_t;

	type $1_ssh_agent_t, ssh_agent_type;

	application_domain($1_ssh_agent_t, ssh_agent_exec_t)

	domain_interactive_fd($1_ssh_agent_t)

	ubac_constrained($1_ssh_agent_t)

	role $2 types $1_ssh_agent_t;

	##############################

	#

	# Local policy

	#

	# Transition from the domain to the derived domain.

	domtrans_pattern($3, ssh_exec_t, ssh_t)

	# inheriting stream sockets is needed for "ssh host command" as no pty

	# is allocated

	allow $3 ssh_server:unix_stream_socket rw_stream_socket_perms;

	# allow ps to show ssh

	ps_process_pattern($3, ssh_t)

	allow $3 ssh_t:process signal;

	# for rsync

	allow ssh_t $3:unix_stream_socket rw_socket_perms;

	allow ssh_t $3:unix_stream_socket connectto;

	# user can manage the keys and config

	manage_files_pattern($3, ssh_home_t, ssh_home_t)

	manage_lnk_files_pattern($3, ssh_home_t, ssh_home_t)

	manage_sock_files_pattern($3, ssh_home_t, ssh_home_t)

	userdom_search_user_home_dirs($1_t)

	##############################

	#

	# SSH agent local policy

	#

	allow $1_ssh_agent_t self:process setrlimit;

	allow $1_ssh_agent_t self:capability setgid;

	allow $1_ssh_agent_t { $1_ssh_agent_t $3 }:process signull;

	allow $1_ssh_agent_t self:unix_stream_socket { create_stream_socket_perms connectto };

	manage_dirs_pattern($1_ssh_agent_t, ssh_agent_tmp_t, ssh_agent_tmp_t)

	manage_sock_files_pattern($1_ssh_agent_t, ssh_agent_tmp_t, ssh_agent_tmp_t)

	files_tmp_filetrans($1_ssh_agent_t, ssh_agent_tmp_t, { dir sock_file })

	# for ssh-add

	stream_connect_pattern($3, ssh_agent_tmp_t, ssh_agent_tmp_t, $1_ssh_agent_t)

	# Allow the user shell to signal the ssh program.

	allow $3 $1_ssh_agent_t:process signal;

	# allow ps to show ssh

	ps_process_pattern($3, $1_ssh_agent_t)

	domtrans_pattern($3, ssh_agent_exec_t, $1_ssh_agent_t)

	kernel_read_kernel_sysctls($1_ssh_agent_t)

	dev_read_urand($1_ssh_agent_t)

	dev_read_rand($1_ssh_agent_t)

	fs_search_auto_mountpoints($1_ssh_agent_t)

	# transition back to normal privs upon exec

	corecmd_shell_domtrans($1_ssh_agent_t, $3)

	corecmd_bin_domtrans($1_ssh_agent_t, $3)

	domain_use_interactive_fds($1_ssh_agent_t)

	files_read_etc_files($1_ssh_agent_t)

	files_read_etc_runtime_files($1_ssh_agent_t)

	files_search_home($1_ssh_agent_t)

	libs_read_lib_files($1_ssh_agent_t)

	logging_send_syslog_msg($1_ssh_agent_t)

	miscfiles_read_localization($1_ssh_agent_t)

	miscfiles_read_certs($1_ssh_agent_t)

	seutil_dontaudit_read_config($1_ssh_agent_t)

	# Write to the user domain tty.

	userdom_use_user_terminals($1_ssh_agent_t)

	# for the transition back to normal privs upon exec

	userdom_search_user_home_content($1_ssh_agent_t)

	userdom_user_home_domtrans($1_ssh_agent_t, $3)

	allow $3 $1_ssh_agent_t:fd use;

	allow $3 $1_ssh_agent_t:fifo_file rw_file_perms;

	allow $3 $1_ssh_agent_t:process sigchld;

	tunable_policy(`use_nfs_home_dirs',`

		fs_manage_nfs_files($1_ssh_agent_t)

		# transition back to normal privs upon exec

		fs_nfs_domtrans($1_ssh_agent_t, $3)

	')

	tunable_policy(`use_samba_home_dirs',`

		fs_manage_cifs_files($1_ssh_agent_t)

		# transition back to normal privs upon exec

		fs_cifs_domtrans($1_ssh_agent_t, $3)

	')

	optional_policy(`

		nis_use_ypbind($1_ssh_agent_t)

	')

	optional_policy(`

		xserver_use_xdm_fds($1_ssh_agent_t)

		xserver_rw_xdm_pipes($1_ssh_agent_t)

	')

')

########################################

## <summary>

##	Send a SIGCHLD signal to the ssh server.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_sigchld',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:process sigchld;

')

########################################

## <summary>

##	Send a generic signal to the ssh server.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_signal',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:process signal;

')

########################################

## <summary>

##	Read a ssh server unnamed pipe.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_read_pipes',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:fifo_file { getattr read };

')

########################################

## <summary>

##	Read and write a ssh server unnamed pipe.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_rw_pipes',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:fifo_file { write read getattr ioctl };

')

########################################

## <summary>

##	Read and write ssh server unix domain stream sockets.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_rw_stream_sockets',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:unix_stream_socket rw_stream_socket_perms;

')

########################################

## <summary>

##	Read and write ssh server TCP sockets.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_rw_tcp_sockets',`

	gen_require(`

		type sshd_t;

	')

	allow $1 sshd_t:tcp_socket rw_stream_socket_perms;

')

########################################

## <summary>

##	Do not audit attempts to read and write

##	ssh server TCP sockets.

## </summary>

## <param name="domain">

##	<summary>

##	Domain to not audit.

##	</summary>

## </param>

#

interface(`ssh_dontaudit_rw_tcp_sockets',`

	gen_require(`

		type sshd_t;

	')

	dontaudit $1 sshd_t:tcp_socket { read write };

')

########################################

## <summary>

##	Connect to SSH daemons over TCP sockets.  (Deprecated)

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_tcp_connect',`

	refpolicywarn(`$0($*) has been deprecated.')

')

########################################

## <summary>

##	Execute the ssh daemon sshd domain.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_domtrans',`

	gen_require(`

		type sshd_t, sshd_exec_t;

	')

	domtrans_pattern($1, sshd_exec_t, sshd_t)

')

########################################

## <summary>

##	Execute the ssh client in the caller domain.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_exec',`

	gen_require(`

		type ssh_exec_t;

	')

	corecmd_search_bin($1)

	can_exec($1, ssh_exec_t)

')

########################################

## <summary>

##	Set the attributes of sshd key files.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_setattr_key_files',`

	gen_require(`

		type sshd_key_t;

	')

	allow $1 sshd_key_t:file setattr;

	files_search_pids($1)

')

########################################

## <summary>

##	Execute the ssh agent client in the caller domain.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_agent_exec',`

	gen_require(`

		type ssh_agent_exec_t;

	')

	corecmd_search_bin($1)

	can_exec($1, ssh_agent_exec_t)

')

########################################

## <summary>

##	Read ssh home directory content

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_read_user_home_files',`

	gen_require(`

		type ssh_home_t;

	')

	allow $1 ssh_home_t:dir list_dir_perms;

	read_files_pattern($1, ssh_home_t, ssh_home_t)

	read_lnk_files_pattern($1, ssh_home_t, ssh_home_t)

	userdom_search_user_home_dirs($1)

')

########################################

## <summary>

##	Execute the ssh key generator in the ssh keygen domain.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_domtrans_keygen',`

	gen_require(`

		type ssh_keygen_t, ssh_keygen_exec_t;

	')

	domtrans_pattern($1, ssh_keygen_exec_t, ssh_keygen_t)

')

########################################

## <summary>

##	Read ssh server keys

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_dontaudit_read_server_keys',`

	gen_require(`

		type sshd_key_t;

	')

	dontaudit $1 sshd_key_t:file { getattr read };

')

######################################

## <summary>

##	Manage ssh home directory content

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_manage_home_files',`

	gen_require(`

		type ssh_home_t;

	')

	manage_files_pattern($1, ssh_home_t, ssh_home_t)

	userdom_search_user_home_dirs($1)

')

#######################################

## <summary>

##	Delete from the ssh temp files.

## </summary>

## <param name="domain">

##	<summary>

##	Domain allowed access.

##	</summary>

## </param>

#

interface(`ssh_delete_tmp',`

	gen_require(`

		type sshd_tmp_t;

	')

	files_search_tmp($1)

	delete_files_pattern($1, sshd_tmp_t, sshd_tmp_t)

')