policy_module(ssh, 2.4.2) ######################################## # # Declarations # ## ##

## allow host key based authentication ##

##
gen_tunable(ssh_keysign, false) ## ##

## Allow ssh logins as sysadm_r:sysadm_t ##

##
gen_tunable(ssh_sysadm_login, false) ## ##

## allow ssh with chroot env to read and write files ## in the user home directories ##

##
gen_tunable(ssh_chroot_rw_homedirs, false) ## ##

## Allow sshd to use tcp wrappers ##

##
gen_tunable(ssh_use_tcpd, false) attribute ssh_dyntransition_domain; attribute ssh_server; attribute ssh_agent_type; ssh_dyntransition_domain_template(chroot_user_t) ssh_dyntransition_domain_template(sshd_sandbox_t) ssh_dyntransition_domain_template(sshd_net_t) type ssh_keygen_t; type ssh_keygen_exec_t; init_system_domain(ssh_keygen_t, ssh_keygen_exec_t) type ssh_keygen_tmp_t; files_tmp_file(ssh_keygen_tmp_t) type sshd_keygen_t; type sshd_keygen_exec_t; init_daemon_domain(sshd_keygen_t, sshd_keygen_exec_t) type sshd_keygen_unit_file_t; systemd_unit_file(sshd_keygen_unit_file_t) type sshd_exec_t; corecmd_executable_file(sshd_exec_t) ssh_server_template(sshd) init_daemon_domain(sshd_t, sshd_exec_t) mls_trusted_object(sshd_t) mls_process_write_all_levels(sshd_t) mls_dbus_send_all_levels(sshd_t) type sshd_initrc_exec_t; init_script_file(sshd_initrc_exec_t) type sshd_unit_file_t; systemd_unit_file(sshd_unit_file_t) type sshd_key_t; files_type(sshd_key_t) type sshd_keytab_t; files_type(sshd_keytab_t) type ssh_t; type ssh_exec_t; typealias ssh_t alias { user_ssh_t staff_ssh_t sysadm_ssh_t }; typealias ssh_t alias { auditadm_ssh_t secadm_ssh_t }; userdom_user_application_domain(ssh_t, ssh_exec_t) type ssh_agent_exec_t; corecmd_executable_file(ssh_agent_exec_t) type ssh_agent_tmp_t; typealias ssh_agent_tmp_t alias { user_ssh_agent_tmp_t staff_ssh_agent_tmp_t sysadm_ssh_agent_tmp_t }; typealias ssh_agent_tmp_t alias { auditadm_ssh_agent_tmp_t secadm_ssh_agent_tmp_t }; userdom_user_tmp_file(ssh_agent_tmp_t) userdom_user_tmp_filetrans(ssh_agent_type, ssh_agent_tmp_t, sock_file) type ssh_keysign_t; type ssh_keysign_exec_t; typealias ssh_keysign_t alias { user_ssh_keysign_t staff_ssh_keysign_t sysadm_ssh_keysign_t }; typealias ssh_keysign_t alias { auditadm_ssh_keysign_t secadm_ssh_keysign_t }; userdom_user_application_domain(ssh_keysign_t, ssh_keysign_exec_t) type ssh_tmpfs_t; typealias ssh_tmpfs_t alias { user_ssh_tmpfs_t staff_ssh_tmpfs_t sysadm_ssh_tmpfs_t }; typealias ssh_tmpfs_t alias { auditadm_ssh_tmpfs_t secadm_ssh_tmpfs_t }; userdom_user_tmp_file(ssh_tmpfs_t) type ssh_home_t; typealias ssh_home_t alias { home_ssh_t user_ssh_home_t user_home_ssh_t staff_home_ssh_t sysadm_home_ssh_t }; typealias ssh_home_t alias { auditadm_home_ssh_t secadm_home_ssh_t }; userdom_user_home_content(ssh_home_t) files_poly_parent(ssh_home_t) ifdef(`enable_mcs',` init_ranged_daemon_domain(sshd_t, sshd_exec_t, s0 - mcs_systemhigh) ') ############################## # # SSH client local policy # allow ssh_t self:capability { setuid setgid dac_read_search }; allow ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap }; allow ssh_t self:fd use; allow ssh_t self:fifo_file rw_fifo_file_perms; allow ssh_t self:key manage_key_perms; allow ssh_t self:unix_dgram_socket { create_socket_perms sendto }; allow ssh_t self:unix_stream_socket { create_stream_socket_perms connectto }; allow ssh_t self:shm create_shm_perms; allow ssh_t self:sem create_sem_perms; allow ssh_t self:msgq create_msgq_perms; allow ssh_t self:msg { send receive }; allow ssh_t self:tcp_socket create_stream_socket_perms; can_exec(ssh_t, ssh_exec_t) # Read the ssh key file. allow ssh_t sshd_key_t:file read_file_perms; manage_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t) manage_lnk_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t) manage_fifo_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t) manage_sock_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t) #fs_tmpfs_filetrans(ssh_t, ssh_tmpfs_t, { dir file lnk_file sock_file fifo_file }) manage_dirs_pattern(ssh_t, ssh_home_t, ssh_home_t) manage_sock_files_pattern(ssh_t, ssh_home_t, ssh_home_t) userdom_user_home_dir_filetrans(ssh_t, ssh_home_t, sock_file) userdom_user_home_content_filetrans(ssh_t, ssh_home_t, sock_file) userdom_user_home_dir_filetrans(ssh_t, ssh_home_t, dir, ".ssh") userdom_read_all_users_keys(ssh_t) userdom_stream_connect(ssh_t) userdom_search_admin_dir(sshd_t) # Allow the ssh program to communicate with ssh-agent. stream_connect_pattern(ssh_t, ssh_agent_tmp_t, ssh_agent_tmp_t, ssh_agent_type) allow ssh_t sshd_t:unix_stream_socket connectto; allow ssh_t sshd_t:peer recv; # ssh client can manage the keys and config manage_files_pattern(ssh_t, ssh_home_t, ssh_home_t) read_lnk_files_pattern(ssh_t, ssh_home_t, ssh_home_t) # ssh servers can read the user keys and config manage_dirs_pattern(ssh_server, ssh_home_t, ssh_home_t) manage_files_pattern(ssh_server, ssh_home_t, ssh_home_t) kernel_read_device_sysctls(ssh_t) kernel_read_kernel_sysctls(ssh_t) kernel_read_system_state(ssh_t) corenet_all_recvfrom_netlabel(ssh_t) corenet_tcp_sendrecv_generic_if(ssh_t) corenet_tcp_sendrecv_generic_node(ssh_t) corenet_tcp_sendrecv_all_ports(ssh_t) corenet_tcp_connect_ssh_port(ssh_t) corenet_tcp_connect_all_unreserved_ports(ssh_t) corenet_sendrecv_ssh_client_packets(ssh_t) corenet_tcp_bind_generic_node(ssh_t) #corenet_tcp_bind_all_unreserved_ports(ssh_t) corenet_rw_tun_tap_dev(ssh_t) dev_read_rand(ssh_t) dev_read_urand(ssh_t) dev_read_sysfs(ssh_t) fs_getattr_all_fs(ssh_t) fs_search_auto_mountpoints(ssh_t) # run helper programs - needed eg for x11-ssh-askpass corecmd_exec_shell(ssh_t) corecmd_exec_bin(ssh_t) domain_use_interactive_fds(ssh_t) files_list_home(ssh_t) files_read_usr_files(ssh_t) files_read_etc_runtime_files(ssh_t) files_read_etc_files(ssh_t) files_read_var_files(ssh_t) logging_send_syslog_msg(ssh_t) logging_read_generic_logs(ssh_t) term_use_ptmx(ssh_t) auth_use_nsswitch(ssh_t) miscfiles_read_generic_certs(ssh_t) miscfiles_read_hwdata(ssh_t) seutil_read_config(ssh_t) userdom_dontaudit_list_user_home_dirs(ssh_t) userdom_search_user_home_dirs(ssh_t) userdom_search_admin_dir(ssh_t) # Write to the user domain tty. userdom_use_inherited_user_terminals(ssh_t) # needs to read krb/write tgt userdom_read_user_tmp_files(ssh_t) userdom_write_user_tmp_files(ssh_t) userdom_read_user_home_content_symlinks(ssh_t) userdom_rw_inherited_user_home_content_files(ssh_t) userdom_read_home_certs(ssh_t) userdom_home_manager(ssh_t) tunable_policy(`ssh_keysign',` domtrans_pattern(ssh_t, ssh_keysign_exec_t, ssh_keysign_t) ') # for port forwarding tunable_policy(`selinuxuser_tcp_server',` corenet_tcp_bind_ssh_port(ssh_t) corenet_tcp_bind_generic_node(ssh_t) corenet_tcp_bind_all_unreserved_ports(ssh_t) ') ifdef(`enable_mcs',` optional_policy(` condor_startd_ranged_domtrans_to(sshd_t, sshd_exec_t, mcs_systemlow - mcs_systemhigh) ') ') optional_policy(` dbus_write_session_tmp_sock_files(ssh_t) dbus_stream_connect_session_bus(ssh_t) ') optional_policy(` gnome_read_generic_cache_files(ssh_t) gnome_map_generic_cache_files(ssh_t) gnome_read_home_config(ssh_t) gnome_stream_connect_gkeyringd(ssh_t) ') optional_policy(` gpg_agent_stream_connect(ssh_t) ') optional_policy(` kerberos_read_home_content(ssh_t) kerberos_read_keytab(ssh_t) ') optional_policy(` xserver_user_x_domain_template(ssh, ssh_t, ssh_tmpfs_t) xserver_domtrans_xauth(ssh_t) xserver_map_user_fonts(ssh_t) ') ############################## # # ssh_keysign_t local policy # allow ssh_keysign_t self:capability { setgid setuid }; allow ssh_keysign_t self:unix_stream_socket create_socket_perms; allow ssh_keysign_t self:udp_socket create_socket_perms; allow ssh_keysign_t sshd_key_t:file { getattr open read }; kernel_read_network_state(ssh_keysign_t) auth_read_passwd(ssh_keysign_t) dev_read_urand(ssh_keysign_t) dev_read_rand(ssh_keysign_t) files_read_etc_files(ssh_keysign_t) optional_policy(` nscd_use(ssh_keysign_t) ') optional_policy(` sssd_read_public_files(ssh_keysign_t) ') optional_policy(` sge_rw_tcp_sockets(ssh_keysign_t) ') ################################# # # 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 }; allow sshd_t self:process setcurrent; allow sshd_t sshd_keytab_t:file read_file_perms; kernel_search_key(sshd_t) kernel_link_key(sshd_t) kernel_read_fs_sysctls(sshd_t) kernel_read_net_sysctls(sshd_t) files_search_all(sshd_t) files_create_home_dir(sshd_t) fs_search_cgroup_dirs(sshd_t) fs_rw_cgroup_files(sshd_t) term_use_all_ptys(sshd_t) term_setattr_all_ptys(sshd_t) term_setattr_all_ttys(sshd_t) term_relabelto_all_ptys(sshd_t) term_use_ptmx(sshd_t) # for X forwarding corenet_tcp_bind_xserver_port(sshd_t) corenet_tcp_bind_vnc_port(sshd_t) corenet_sendrecv_xserver_server_packets(sshd_t) auth_exec_login_program(sshd_t) auth_signal_chk_passwd(sshd_t) userdom_read_user_home_content_files(sshd_t) userdom_read_user_home_content_symlinks(sshd_t) #userdom_manage_tmp_role(system_r, sshd_t) userdom_spec_domtrans_unpriv_users(sshd_t) userdom_signal_unpriv_users(sshd_t) userdom_dyntransition_unpriv_users(sshd_t) userdom_map_tmp_files(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 userdom_signal_all_users(sshd_t) userdom_spec_domtrans_admin_users(sshd_t) userdom_dyntransition_admin_users(sshd_t) ') optional_policy(` amanda_search_var_lib(sshd_t) ') optional_policy(` condor_rw_lib_files(sshd_t) condor_rw_tcp_sockets_startd(sshd_t) condor_rw_tcp_sockets_schedd(sshd_t) ') optional_policy(` cockpit_read_pid_files(sshd_t) ') optional_policy(` daemontools_service_domain(sshd_t, sshd_exec_t) ') optional_policy(` ftp_dyntrans_sftpd(sshd_t) ftp_dyntrans_anon_sftpd(sshd_t) ') optional_policy(` gitosis_manage_lib_files(sshd_t) ') optional_policy(` gnome_exec_keyringd(sshd_t) ') optional_policy(` ica_rw_map_tmpfs_files(sshd_t) ') optional_policy(` inetd_tcp_service_domain(sshd_t, sshd_exec_t) ') optional_policy(` kerberos_read_keytab(sshd_t) kerberos_tmp_filetrans_host_rcache(sshd_t, "krb5_0.rcache2") kerberos_use(sshd_t) kerberos_write_kadmind_tmp_files(sshd_t) ') optional_policy(` lvm_domtrans(sshd_t) ') optional_policy(` munin_read_var_lib_files(sshd_t) ') optional_policy(` nx_read_home_files(sshd_t) ') optional_policy(` oddjob_domtrans_mkhomedir(sshd_t) ') optional_policy(` rpc_rw_gssd_keys(sshd_t) ') optional_policy(` rpm_use_script_fds(sshd_t) ') optional_policy(` rssh_spec_domtrans(sshd_t) # For reading /home/user/.ssh rssh_read_ro_content(sshd_t) ') optional_policy(` rsync_read_data(sshd_t) ') optional_policy(` systemd_exec_systemctl(sshd_t) systemd_userdbd_stream_connect(sshd_t) ') optional_policy(` usermanage_domtrans_passwd(sshd_t) usermanage_read_crack_db(sshd_t) ') optional_policy(` openshift_dyntransition(sshd_t) openshift_transition(sshd_t) openshift_manage_tmp_files(sshd_t) openshift_manage_tmp_sockets(sshd_t) openshift_mounton_tmp(sshd_t) openshift_read_lib_files(sshd_t) ') optional_policy(` postgresql_search_db(sshd_t) ') optional_policy(` unconfined_shell_domtrans(sshd_t) ') optional_policy(` sge_rw_tcp_sockets(sshd_t) ') optional_policy(` kernel_write_proc_files(sshd_t) virt_transition_svirt_sandbox(sshd_t, system_r) virt_stream_connect_sandbox(sshd_t) virt_stream_connect(sshd_t) ') optional_policy(` xserver_domtrans_xauth(sshd_t) xserver_xdm_signull(sshd_t) ') optional_policy(` tunable_policy(`ssh_use_tcpd',` tcpd_wrapped_domain(sshd_t,sshd_exec_t) tcpd_rw_tcp_sockets(sshd_net_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 rw_inherited_chr_file_perms setattr_chr_file_perms }; ') ') dnl endif TODO ######################################## # # sshd-keygen local policy # allow sshd_keygen_t self:capability { chown fsetid }; allow sshd_keygen_t self:fifo_file rw_fifo_file_perms; allow sshd_keygen_t self:unix_stream_socket create_stream_socket_perms; allow sshd_keygen_t sshd_key_t:file manage_file_perms; kernel_read_system_state(sshd_keygen_t) kernel_dontaudit_request_load_module(sshd_keygen_t) corecmd_exec_bin(sshd_keygen_t) auth_use_nsswitch(sshd_keygen_t) files_rw_etc_dirs(sshd_keygen_t) #run restorecon seutil_domtrans_setfiles(sshd_keygen_t) ssh_domtrans_keygen(sshd_keygen_t) optional_policy(` plymouthd_exec_plymouth(sshd_keygen_t) ') ######################################## # # ssh_keygen local policy # # ssh_keygen_t is the type of the ssh-keygen program when run at install time # and by sysadm_t allow ssh_keygen_t self:capability { dac_read_search }; 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) manage_dirs_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t) manage_files_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t) userdom_admin_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir) userdom_user_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir) manage_dirs_pattern(ssh_keygen_t, ssh_keygen_tmp_t, ssh_keygen_tmp_t) manage_files_pattern(ssh_keygen_t, ssh_keygen_tmp_t, ssh_keygen_tmp_t) files_tmp_filetrans(ssh_keygen_t, ssh_keygen_tmp_t, { file dir }) kernel_read_system_state(ssh_keygen_t) kernel_read_kernel_sysctls(ssh_keygen_t) corecmd_exec_shell(ssh_keygen_t) corecmd_exec_bin(ssh_keygen_t) fs_search_auto_mountpoints(ssh_keygen_t) dev_read_sysfs(ssh_keygen_t) dev_read_rand(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) auth_use_nsswitch(ssh_keygen_t) logging_send_syslog_msg(ssh_keygen_t) userdom_home_manager(ssh_keygen_t) userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t) userdom_use_user_terminals(ssh_keygen_t) optional_policy(` seutil_sigchld_newrole(ssh_keygen_t) ') optional_policy(` udev_read_db(ssh_keygen_t) ') #################################### # # ssh_dyntransition domain local policy # allow ssh_dyntransition_domain self:capability { setuid sys_chroot setgid }; allow ssh_dyntransition_domain self:unix_dgram_socket create_socket_perms; allow ssh_dyntransition_domain self:fifo_file rw_fifo_file_perms; allow ssh_dyntransition_domain sshd_t:fd use; optional_policy(` ssh_rw_stream_sockets(ssh_dyntransition_domain) ssh_rw_tcp_sockets(ssh_dyntransition_domain) ') ##################################### # # ssh_sandbox local policy # allow sshd_t sshd_sandbox_t:process signal; init_ioctl_stream_sockets(sshd_sandbox_t) logging_send_audit_msgs(sshd_sandbox_t) ##################################### # # sshd [net] child local policy # allow sshd_t sshd_net_t:process signal; allow sshd_net_t self:process setrlimit; dev_rw_crypto(sshd_net_t) init_ioctl_stream_sockets(sshd_net_t) init_rw_tcp_sockets(sshd_net_t) logging_send_audit_msgs(sshd_net_t) ###################################### # # chroot_user_t local policy # allow chroot_user_t self:fifo_file rw_fifo_file_perms; allow chroot_user_t self:unix_dgram_socket create_socket_perms; corecmd_exec_shell(chroot_user_t) domain_subj_id_change_exemption(chroot_user_t) domain_role_change_exemption(chroot_user_t) term_search_ptys(chroot_user_t) term_use_ptmx(chroot_user_t) fs_getattr_all_fs(chroot_user_t) userdom_read_user_home_content_files(chroot_user_t) userdom_read_inherited_user_home_content_files(chroot_user_t) userdom_read_user_home_content_symlinks(chroot_user_t) userdom_exec_user_home_content_files(chroot_user_t) userdom_use_inherited_user_ptys(chroot_user_t) tunable_policy(`ssh_chroot_rw_homedirs',` files_list_home(chroot_user_t) userdom_manage_user_home_content_files(chroot_user_t) userdom_manage_user_home_content_symlinks(chroot_user_t) userdom_manage_user_home_content_pipes(chroot_user_t) userdom_manage_user_home_content_sockets(chroot_user_t) userdom_manage_user_home_content_dirs(chroot_user_t) ') tunable_policy(`ssh_chroot_rw_homedirs && use_nfs_home_dirs',` fs_manage_nfs_dirs(chroot_user_t) fs_manage_nfs_files(chroot_user_t) fs_manage_nfs_symlinks(chroot_user_t) ') tunable_policy(`ssh_chroot_rw_homedirs && use_samba_home_dirs',` fs_manage_cifs_dirs(chroot_user_t) fs_manage_cifs_files(chroot_user_t) fs_manage_cifs_symlinks(chroot_user_t) ') tunable_policy(`ssh_chroot_rw_homedirs && use_fusefs_home_dirs',` fs_manage_fusefs_dirs(chroot_user_t) fs_manage_fusefs_files(chroot_user_t) fs_manage_fusefs_symlinks(chroot_user_t) ') tunable_policy(`use_samba_home_dirs',` fs_read_cifs_files(chroot_user_t) fs_read_cifs_symlinks(chroot_user_t) ') userdom_home_manager(chroot_user_t) optional_policy(` ssh_rw_dgram_sockets(chroot_user_t) ') optional_policy(` unconfined_shell_domtrans(chroot_user_t) ') ###################################### # # ssh_agent_type common policy local policy # allow ssh_agent_type self:process setrlimit; allow ssh_agent_type self:capability setgid; manage_dirs_pattern(ssh_agent_type, ssh_agent_tmp_t, ssh_agent_tmp_t) manage_sock_files_pattern(ssh_agent_type, ssh_agent_tmp_t, ssh_agent_tmp_t) files_tmp_filetrans(ssh_agent_type, ssh_agent_tmp_t, { dir sock_file }) kernel_read_kernel_sysctls(ssh_agent_type) dev_read_urand(ssh_agent_type) dev_read_rand(ssh_agent_type) fs_search_auto_mountpoints(ssh_agent_type) domain_use_interactive_fds(ssh_agent_type) files_read_etc_files(ssh_agent_type) files_read_etc_runtime_files(ssh_agent_type) libs_read_lib_files(ssh_agent_type) miscfiles_read_generic_certs(ssh_agent_type) # Write to the user domain tty. userdom_use_inherited_user_terminals(ssh_agent_type) # for the transition back to normal privs upon exec userdom_search_user_home_content(ssh_agent_type) optional_policy(` cockpit_rw_pipes(ssh_agent_type) ') optional_policy(` gnome_manage_generic_cache_files(ssh_agent_type) ') optional_policy(` xserver_use_xdm_fds(ssh_agent_type) xserver_rw_xdm_pipes(ssh_agent_type) ')