policy/modules/services/ssh.te

   1 policy_module(ssh, 2.2.0)
   2
   3 ########################################
   4 #
   5 # Declarations
   6 #
   7
   8 ## <desc>
   9 ##      <p>
  10 ##      allow host key based authentication
  11 ##      </p>
  12 ## </desc>
  13 gen_tunable(allow_ssh_keysign, false)
  14
  15 ## <desc>
  16 ##      <p>
  17 ##      Allow ssh logins as sysadm_r:sysadm_t
  18 ##      </p>
  19 ## </desc>
  20 gen_tunable(ssh_sysadm_login, false)
  21
  22 ## <desc>
  23 ##      <p>
  24 ##      allow sshd to forward port connections
  25 ##      </p>
  26 ## </desc>
  27 gen_tunable(sshd_forward_ports, false)
  28
  29 attribute ssh_server;
  30 attribute ssh_agent_type;
  31
  32 type ssh_keygen_t;
  33 type ssh_keygen_exec_t;
  34 init_system_domain(ssh_keygen_t, ssh_keygen_exec_t)
  35
  36 type sshd_exec_t;
  37 corecmd_executable_file(sshd_exec_t)
  38
  39 ssh_server_template(sshd)
  40 init_daemon_domain(sshd_t, sshd_exec_t)
  41
  42 type sshd_initrc_exec_t;
  43 init_script_file(sshd_initrc_exec_t)
  44
  45 type sshd_key_t;
  46 files_type(sshd_key_t)
  47
  48 type ssh_t;
  49 type ssh_exec_t;
  50 typealias ssh_t alias { user_ssh_t staff_ssh_t sysadm_ssh_t };
  51 typealias ssh_t alias { auditadm_ssh_t secadm_ssh_t };
  52 application_domain(ssh_t, ssh_exec_t)
  53 ubac_constrained(ssh_t)
  54
  55 type ssh_agent_exec_t;
  56 corecmd_executable_file(ssh_agent_exec_t)
  57
  58 type ssh_agent_tmp_t;
  59 typealias ssh_agent_tmp_t alias { user_ssh_agent_tmp_t staff_ssh_agent_tmp_t sysadm_ssh_agent_tmp_t };
  60 typealias ssh_agent_tmp_t alias { auditadm_ssh_agent_tmp_t secadm_ssh_agent_tmp_t };
  61 files_tmp_file(ssh_agent_tmp_t)
  62 ubac_constrained(ssh_agent_tmp_t)
  63
  64 type ssh_keysign_t;
  65 type ssh_keysign_exec_t;
  66 typealias ssh_keysign_t alias { user_ssh_keysign_t staff_ssh_keysign_t sysadm_ssh_keysign_t };
  67 typealias ssh_keysign_t alias { auditadm_ssh_keysign_t secadm_ssh_keysign_t };
  68 application_domain(ssh_keysign_t, ssh_keysign_exec_t)
  69 ubac_constrained(ssh_keysign_t)
  70
  71 type ssh_tmpfs_t;
  72 typealias ssh_tmpfs_t alias { user_ssh_tmpfs_t staff_ssh_tmpfs_t sysadm_ssh_tmpfs_t };
  73 typealias ssh_tmpfs_t alias { auditadm_ssh_tmpfs_t secadm_ssh_tmpfs_t };
  74 files_tmpfs_file(ssh_tmpfs_t)
  75 ubac_constrained(ssh_tmpfs_t)
  76
  77 type ssh_home_t;
  78 typealias ssh_home_t alias { home_ssh_t user_ssh_home_t user_home_ssh_t staff_home_ssh_t sysadm_home_ssh_t };
  79 typealias ssh_home_t alias { auditadm_home_ssh_t secadm_home_ssh_t };
  80 userdom_user_home_content(ssh_home_t)
  81 files_poly_parent(ssh_home_t)
  82
  83 ifdef(`enable_mcs',`
  84         init_ranged_daemon_domain(sshd_t, sshd_exec_t, s0 - mcs_systemhigh)
  85 ')
  86
  87 ##############################
  88 #
  89 # SSH client local policy
  90 #
  91
  92 allow ssh_t self:capability { setuid setgid dac_override dac_read_search };
  93 allow ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
  94 allow ssh_t self:fd use;
  95 allow ssh_t self:fifo_file rw_fifo_file_perms;
  96 allow ssh_t self:unix_dgram_socket { create_socket_perms sendto };
  97 allow ssh_t self:unix_stream_socket { create_stream_socket_perms connectto };
  98 allow ssh_t self:shm create_shm_perms;
  99 allow ssh_t self:sem create_sem_perms;
 100 allow ssh_t self:msgq create_msgq_perms;
 101 allow ssh_t self:msg { send receive };
 102 allow ssh_t self:tcp_socket create_stream_socket_perms;
 103 can_exec(ssh_t, ssh_exec_t)
 104
 105 # Read the ssh key file.
 106 allow ssh_t sshd_key_t:file read_file_perms;
 107
 108 manage_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 109 manage_lnk_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 110 manage_fifo_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 111 manage_sock_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 112 fs_tmpfs_filetrans(ssh_t, ssh_tmpfs_t, { dir file lnk_file sock_file fifo_file })
 113
 114 manage_dirs_pattern(ssh_t, ssh_home_t, ssh_home_t)
 115 manage_sock_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 116 userdom_user_home_dir_filetrans(ssh_t, ssh_home_t, { dir sock_file })
 117 userdom_stream_connect(ssh_t)
 118 userdom_search_admin_dir(sshd_t)
 119 userdom_admin_home_dir_filetrans(ssh_t, ssh_home_t, { dir sock_file })
 120
 121 # Allow the ssh program to communicate with ssh-agent.
 122 stream_connect_pattern(ssh_t, ssh_agent_tmp_t, ssh_agent_tmp_t, ssh_agent_type)
 123
 124 allow ssh_t sshd_t:unix_stream_socket connectto;
 125 allow ssh_t sshd_t:peer recv;
 126
 127 # ssh client can manage the keys and config
 128 manage_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 129 read_lnk_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 130
 131 # ssh servers can read the user keys and config
 132 manage_dirs_pattern(ssh_server, ssh_home_t, ssh_home_t)
 133 manage_files_pattern(ssh_server, ssh_home_t, ssh_home_t)
 134 userdom_user_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 135 userdom_admin_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 136
 137 kernel_read_kernel_sysctls(ssh_t)
 138 kernel_read_system_state(ssh_t)
 139
 140 corenet_all_recvfrom_unlabeled(ssh_t)
 141 corenet_all_recvfrom_netlabel(ssh_t)
 142 corenet_tcp_sendrecv_generic_if(ssh_t)
 143 corenet_tcp_sendrecv_generic_node(ssh_t)
 144 corenet_tcp_sendrecv_all_ports(ssh_t)
 145 corenet_tcp_connect_ssh_port(ssh_t)
 146 corenet_sendrecv_ssh_client_packets(ssh_t)
 147 corenet_tcp_bind_generic_node(ssh_t)
 148 corenet_tcp_bind_all_unreserved_ports(ssh_t)
 149 corenet_rw_tun_tap_dev(ssh_t)
 150
 151 dev_read_rand(ssh_t)
 152 dev_read_urand(ssh_t)
 153
 154 fs_getattr_all_fs(ssh_t)
 155 fs_search_auto_mountpoints(ssh_t)
 156
 157 # run helper programs - needed eg for x11-ssh-askpass
 158 corecmd_exec_shell(ssh_t)
 159 corecmd_exec_bin(ssh_t)
 160
 161 domain_use_interactive_fds(ssh_t)
 162
 163 files_list_home(ssh_t)
 164 files_read_usr_files(ssh_t)
 165 files_read_etc_runtime_files(ssh_t)
 166 files_read_etc_files(ssh_t)
 167 files_read_var_files(ssh_t)
 168
 169 logging_send_syslog_msg(ssh_t)
 170 logging_read_generic_logs(ssh_t)
 171
 172 auth_use_nsswitch(ssh_t)
 173
 174 miscfiles_read_localization(ssh_t)
 175 miscfiles_read_generic_certs(ssh_t)
 176
 177 seutil_read_config(ssh_t)
 178
 179 userdom_dontaudit_list_user_home_dirs(ssh_t)
 180 userdom_search_user_home_dirs(ssh_t)
 181 userdom_search_admin_dir(ssh_t)
 182 # Write to the user domain tty.
 183 userdom_use_inherited_user_terminals(ssh_t)
 184 # needs to read krb/write tgt
 185 userdom_read_user_tmp_files(ssh_t)
 186 userdom_write_user_tmp_files(ssh_t)
 187 userdom_read_user_home_content_symlinks(ssh_t)
 188 userdom_read_home_certs(ssh_t)
 189
 190 tunable_policy(`allow_ssh_keysign',`
 191         domtrans_pattern(ssh_t, ssh_keysign_exec_t, ssh_keysign_t)
 192 ')
 193
 194 tunable_policy(`use_fusefs_home_dirs',`
 195         fs_manage_fusefs_dirs(ssh_t)
 196         fs_manage_fusefs_files(ssh_t)
 197 ')
 198
 199 tunable_policy(`use_nfs_home_dirs',`
 200         fs_manage_nfs_dirs(ssh_t)
 201         fs_manage_nfs_files(ssh_t)
 202 ')
 203
 204 tunable_policy(`use_samba_home_dirs',`
 205         fs_manage_cifs_dirs(ssh_t)
 206         fs_manage_cifs_files(ssh_t)
 207 ')
 208
 209 # for port forwarding
 210 tunable_policy(`user_tcp_server',`
 211         corenet_tcp_bind_ssh_port(ssh_t)
 212         corenet_tcp_bind_generic_node(ssh_t)
 213 ')
 214
 215 optional_policy(`
 216         gnome_stream_connect_all_gkeyringd(ssh_t)
 217 ')
 218
 219 optional_policy(`
 220         xserver_user_x_domain_template(ssh, ssh_t, ssh_tmpfs_t)
 221         xserver_domtrans_xauth(ssh_t)
 222 ')
 223
 224
 225 ##############################
 226 #
 227 # ssh_keysign_t local policy
 228 #
 229
 230 tunable_policy(`allow_ssh_keysign',`
 231         allow ssh_keysign_t self:capability { setgid setuid };
 232         allow ssh_keysign_t self:unix_stream_socket create_socket_perms;
 233
 234         allow ssh_keysign_t sshd_key_t:file read_file_perms;
 235
 236         dev_read_rand(ssh_keysign_t)
 237         dev_read_urand(ssh_keysign_t)
 238
 239         files_read_etc_files(ssh_keysign_t)
 240 ')
 241
 242 #################################
 243 #
 244 # sshd local policy
 245 #
 246 # sshd_t is the domain for the sshd program.
 247 #
 248
 249 # so a tunnel can point to another ssh tunnel
 250 allow sshd_t self:netlink_route_socket r_netlink_socket_perms;
 251 allow sshd_t self:key { search link write };
 252 allow sshd_t self:process setcurrent;
 253
 254 kernel_search_key(sshd_t)
 255 kernel_link_key(sshd_t)
 256
 257 term_use_all_ptys(sshd_t)
 258 term_setattr_all_ptys(sshd_t)
 259 term_setattr_all_ttys(sshd_t)
 260 term_relabelto_all_ptys(sshd_t)
 261 term_use_ptmx(sshd_t)
 262
 263 # for X forwarding
 264 corenet_tcp_bind_xserver_port(sshd_t)
 265 corenet_sendrecv_xserver_server_packets(sshd_t)
 266
 267 userdom_read_user_home_content_files(sshd_t)
 268 userdom_read_user_home_content_symlinks(sshd_t)
 269 userdom_manage_tmp_role(system_r, sshd_t)
 270 userdom_spec_domtrans_unpriv_users(sshd_t)
 271 userdom_signal_unpriv_users(sshd_t)
 272
 273 tunable_policy(`sshd_forward_ports',`
 274         corenet_tcp_bind_all_unreserved_ports(sshd_t)
 275         corenet_tcp_connect_all_ports(sshd_t)
 276 ')
 277
 278 tunable_policy(`ssh_sysadm_login',`
 279         # Relabel and access ptys created by sshd
 280         # ioctl is necessary for logout() processing for utmp entry and for w to
 281         # display the tty.
 282         # some versions of sshd on the new SE Linux require setattr
 283         userdom_signal_all_users(sshd_t)
 284         userdom_spec_domtrans_all_users(sshd_t)
 285 ')
 286
 287 optional_policy(`
 288         amanda_search_var_lib(sshd_t)
 289 ')
 290
 291 optional_policy(`
 292         daemontools_service_domain(sshd_t, sshd_exec_t)
 293 ')
 294
 295 optional_policy(`
 296         kerberos_keytab_template(sshd, sshd_t)
 297 ')
 298
 299 optional_policy(`
 300         ftp_dyntrans_sftpd(sshd_t)
 301         ftp_dyntrans_anon_sftpd(sshd_t)
 302 ')
 303
 304 optional_policy(`
 305         gitosis_manage_lib_files(sshd_t)
 306 ')
 307
 308 optional_policy(`
 309         inetd_tcp_service_domain(sshd_t, sshd_exec_t)
 310 ')
 311
 312 optional_policy(`
 313         nx_read_home_files(sshd_t)
 314 ')
 315
 316 optional_policy(`
 317         rpm_use_script_fds(sshd_t)
 318 ')
 319
 320 optional_policy(`
 321         rssh_spec_domtrans(sshd_t)
 322         # For reading /home/user/.ssh
 323         rssh_read_ro_content(sshd_t)
 324 ')
 325
 326 optional_policy(`
 327         systemd_exec_systemctl(sshd_t)
 328 ')
 329
 330 optional_policy(`
 331         usermanage_domtrans_passwd(sshd_t)
 332         usermanage_read_crack_db(sshd_t)
 333 ')
 334
 335 optional_policy(`
 336         unconfined_shell_domtrans(sshd_t)
 337 ')
 338
 339 optional_policy(`
 340         xserver_domtrans_xauth(sshd_t)
 341 ')
 342
 343 ifdef(`TODO',`
 344         tunable_policy(`ssh_sysadm_login',`
 345                 # Relabel and access ptys created by sshd
 346                 # ioctl is necessary for logout() processing for utmp entry and for w to
 347                 # display the tty.
 348                 # some versions of sshd on the new SE Linux require setattr
 349                 allow sshd_t ptyfile:chr_file relabelto;
 350
 351                         optional_policy(`
 352                                 domain_trans(sshd_t, xauth_exec_t, userdomain)
 353                         ')
 354         ',`
 355                 optional_policy(`
 356                         domain_trans(sshd_t, xauth_exec_t, unpriv_userdomain)
 357                 ')
 358                 # Relabel and access ptys created by sshd
 359                 # ioctl is necessary for logout() processing for utmp entry and for w to
 360                 # display the tty.
 361                 # some versions of sshd on the new SE Linux require setattr
 362                 allow sshd_t userpty_type:chr_file { relabelto rw_inherited_chr_file_perms setattr_chr_file_perms };
 363         ')
 364 ') dnl endif TODO
 365
 366 ########################################
 367 #
 368 # ssh_keygen local policy
 369 #
 370
 371 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 372 # and by sysadm_t
 373
 374 allow ssh_keygen_t self:capability dac_override;
 375 dontaudit ssh_keygen_t self:capability sys_tty_config;
 376 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 377 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 378
 379 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 380 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 381
 382 manage_dirs_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 383 manage_files_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 384 userdom_admin_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir)
 385 userdom_user_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir)
 386
 387 kernel_read_system_state(ssh_keygen_t)
 388 kernel_read_kernel_sysctls(ssh_keygen_t)
 389
 390 fs_search_auto_mountpoints(ssh_keygen_t)
 391
 392 dev_read_sysfs(ssh_keygen_t)
 393 dev_read_rand(ssh_keygen_t)
 394 dev_read_urand(ssh_keygen_t)
 395
 396 term_dontaudit_use_console(ssh_keygen_t)
 397
 398 domain_use_interactive_fds(ssh_keygen_t)
 399
 400 files_read_etc_files(ssh_keygen_t)
 401
 402 init_use_fds(ssh_keygen_t)
 403 init_use_script_ptys(ssh_keygen_t)
 404
 405 auth_use_nsswitch(ssh_keygen_t)
 406
 407 logging_send_syslog_msg(ssh_keygen_t)
 408
 409 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 410 userdom_use_user_terminals(ssh_keygen_t)
 411
 412 optional_policy(`
 413         seutil_sigchld_newrole(ssh_keygen_t)
 414 ')
 415
 416 optional_policy(`
 417         udev_read_db(ssh_keygen_t)
 418 ')