policy_module(ssh, 2.1.1) ######################################## # # Declarations # ## ##

## allow host key based authentication ##

##
gen_tunable(allow_ssh_keysign, false) ## ##

## Allow ssh logins as sysadm_r:sysadm_t ##

##
gen_tunable(ssh_sysadm_login, false) attribute ssh_server; attribute ssh_agent_type; 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 sshd_exec_t; corecmd_executable_file(sshd_exec_t) ssh_server_template(sshd) init_daemon_domain(sshd_t, sshd_exec_t) 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) ') 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 }; application_domain(ssh_t, ssh_exec_t) ubac_constrained(ssh_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 }; files_tmp_file(ssh_agent_tmp_t) ubac_constrained(ssh_agent_tmp_t) 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 }; application_domain(ssh_keysign_t, ssh_keysign_exec_t) ubac_constrained(ssh_keysign_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 }; files_tmpfs_file(ssh_tmpfs_t) ubac_constrained(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 }; files_type(ssh_home_t) userdom_user_home_content(ssh_home_t) ############################## # # SSH client local policy # allow ssh_t self:capability { setuid setgid dac_override 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: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; # Read the ssh key file. allow ssh_t sshd_key_t:file read_file_perms; # Access the ssh temporary files. allow ssh_t sshd_tmp_t:dir manage_dir_perms; allow ssh_t sshd_tmp_t:file manage_file_perms; files_tmp_filetrans(ssh_t, sshd_tmp_t, { file dir }) 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, { dir sock_file }) # 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; # 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 allow ssh_server ssh_home_t:dir list_dir_perms; read_files_pattern(ssh_server, ssh_home_t, ssh_home_t) read_lnk_files_pattern(ssh_server, ssh_home_t, ssh_home_t) kernel_read_kernel_sysctls(ssh_t) kernel_read_system_state(ssh_t) corenet_all_recvfrom_unlabeled(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_sendrecv_ssh_client_packets(ssh_t) dev_read_urand(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) auth_use_nsswitch(ssh_t) miscfiles_read_localization(ssh_t) seutil_read_config(ssh_t) userdom_dontaudit_list_user_home_dirs(ssh_t) userdom_search_user_home_dirs(ssh_t) # Write to the user domain tty. userdom_use_user_terminals(ssh_t) # needs to read krb tgt userdom_read_user_tmp_files(ssh_t) tunable_policy(`allow_ssh_keysign',` domain_auto_trans(ssh_t, ssh_keysign_exec_t, ssh_keysign_t) allow ssh_keysign_t ssh_t:fd use; allow ssh_keysign_t ssh_t:process sigchld; allow ssh_keysign_t ssh_t:fifo_file rw_file_perms; ') tunable_policy(`use_nfs_home_dirs',` fs_manage_nfs_dirs(ssh_t) fs_manage_nfs_files(ssh_t) ') tunable_policy(`use_samba_home_dirs',` fs_manage_cifs_dirs(ssh_t) fs_manage_cifs_files(ssh_t) ') # for port forwarding tunable_policy(`user_tcp_server',` corenet_tcp_bind_ssh_port(ssh_t) corenet_tcp_bind_generic_node(ssh_t) ') optional_policy(` xserver_user_x_domain_template(ssh, ssh_t, ssh_tmpfs_t) xserver_domtrans_xauth(ssh_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 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) 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) ') ############################## # # ssh_keysign_t local policy # tunable_policy(`allow_ssh_keysign',` allow ssh_keysign_t self:capability { setgid setuid }; allow ssh_keysign_t self:unix_stream_socket create_socket_perms; allow ssh_keysign_t sshd_key_t:file { getattr read }; dev_read_urand(ssh_keysign_t) files_read_etc_files(ssh_keysign_t) ') optional_policy(` tunable_policy(`allow_ssh_keysign',` nscd_socket_use(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 }; 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) term_use_all_ptys(sshd_t) term_setattr_all_ptys(sshd_t) term_relabelto_all_ptys(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 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) ') optional_policy(` kerberos_keytab_template(sshd, 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(sshd_t) # For reading /home/user/.ssh rssh_read_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 ######################################## # # 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) auth_use_nsswitch(ssh_keygen_t) logging_send_syslog_msg(ssh_keygen_t) userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t) optional_policy(` seutil_sigchld_newrole(ssh_keygen_t) ') optional_policy(` udev_read_db(ssh_keygen_t) ')