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
 119 # Allow the ssh program to communicate with ssh-agent.
 120 stream_connect_pattern(ssh_t, ssh_agent_tmp_t, ssh_agent_tmp_t, ssh_agent_type)
 121
 122 allow ssh_t sshd_t:unix_stream_socket connectto;
 123 allow ssh_t sshd_t:peer recv;
 124
 125 # ssh client can manage the keys and config
 126 manage_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 127 read_lnk_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 128
 129 # ssh servers can read the user keys and config
 130 manage_dirs_pattern(ssh_server, ssh_home_t, ssh_home_t)
 131 manage_files_pattern(ssh_server, ssh_home_t, ssh_home_t)
 132 userdom_user_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 133 userdom_admin_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 134
 135 kernel_read_kernel_sysctls(ssh_t)
 136 kernel_read_system_state(ssh_t)
 137
 138 corenet_all_recvfrom_unlabeled(ssh_t)
 139 corenet_all_recvfrom_netlabel(ssh_t)
 140 corenet_tcp_sendrecv_generic_if(ssh_t)
 141 corenet_tcp_sendrecv_generic_node(ssh_t)
 142 corenet_tcp_sendrecv_all_ports(ssh_t)
 143 corenet_tcp_connect_ssh_port(ssh_t)
 144 corenet_sendrecv_ssh_client_packets(ssh_t)
 145 corenet_tcp_bind_generic_node(ssh_t)
 146 corenet_tcp_bind_all_unreserved_ports(ssh_t)
 147
 148 dev_read_urand(ssh_t)
 149
 150 fs_getattr_all_fs(ssh_t)
 151 fs_search_auto_mountpoints(ssh_t)
 152
 153 # run helper programs - needed eg for x11-ssh-askpass
 154 corecmd_exec_shell(ssh_t)
 155 corecmd_exec_bin(ssh_t)
 156
 157 domain_use_interactive_fds(ssh_t)
 158
 159 files_list_home(ssh_t)
 160 files_read_usr_files(ssh_t)
 161 files_read_etc_runtime_files(ssh_t)
 162 files_read_etc_files(ssh_t)
 163 files_read_var_files(ssh_t)
 164
 165 logging_send_syslog_msg(ssh_t)
 166 logging_read_generic_logs(ssh_t)
 167
 168 auth_use_nsswitch(ssh_t)
 169
 170 miscfiles_read_localization(ssh_t)
 171 miscfiles_read_generic_certs(ssh_t)
 172
 173 seutil_read_config(ssh_t)
 174
 175 userdom_dontaudit_list_user_home_dirs(ssh_t)
 176 userdom_search_user_home_dirs(ssh_t)
 177 # Write to the user domain tty.
 178 userdom_use_user_terminals(ssh_t)
 179 # needs to read krb/write tgt
 180 userdom_read_user_tmp_files(ssh_t)
 181 userdom_write_user_tmp_files(ssh_t)
 182 userdom_read_user_home_content_symlinks(ssh_t)
 183
 184 tunable_policy(`allow_ssh_keysign',`
 185         domtrans_pattern(ssh_t, ssh_keysign_exec_t, ssh_keysign_t)
 186 ')
 187
 188 tunable_policy(`use_fusefs_home_dirs',`
 189         fs_manage_fusefs_dirs(ssh_t)
 190         fs_manage_fusefs_files(ssh_t)
 191 ')
 192
 193 tunable_policy(`use_nfs_home_dirs',`
 194         fs_manage_nfs_dirs(ssh_t)
 195         fs_manage_nfs_files(ssh_t)
 196 ')
 197
 198 tunable_policy(`use_samba_home_dirs',`
 199         fs_manage_cifs_dirs(ssh_t)
 200         fs_manage_cifs_files(ssh_t)
 201 ')
 202
 203 # for port forwarding
 204 tunable_policy(`user_tcp_server',`
 205         corenet_tcp_bind_ssh_port(ssh_t)
 206         corenet_tcp_bind_generic_node(ssh_t)
 207 ')
 208
 209 optional_policy(`
 210         xserver_user_x_domain_template(ssh, ssh_t, ssh_tmpfs_t)
 211         xserver_domtrans_xauth(ssh_t)
 212 ')
 213
 214 ########################################
 215 #
 216 # ssh_keygen local policy
 217 #
 218
 219 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 220 # and by sysadm_t
 221
 222 dontaudit ssh_keygen_t self:capability sys_tty_config;
 223 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 224 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 225
 226 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 227 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 228
 229 manage_dirs_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 230 manage_files_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 231 userdom_admin_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir)
 232
 233 kernel_read_kernel_sysctls(ssh_keygen_t)
 234
 235 fs_search_auto_mountpoints(ssh_keygen_t)
 236
 237 dev_read_sysfs(ssh_keygen_t)
 238 dev_read_urand(ssh_keygen_t)
 239
 240 term_dontaudit_use_console(ssh_keygen_t)
 241
 242 domain_use_interactive_fds(ssh_keygen_t)
 243
 244 files_read_etc_files(ssh_keygen_t)
 245
 246 init_use_fds(ssh_keygen_t)
 247 init_use_script_ptys(ssh_keygen_t)
 248
 249 logging_send_syslog_msg(ssh_keygen_t)
 250
 251 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 252
 253 optional_policy(`
 254         nscd_socket_use(ssh_keygen_t)
 255 ')
 256
 257 optional_policy(`
 258         seutil_sigchld_newrole(ssh_keygen_t)
 259 ')
 260
 261 optional_policy(`
 262         udev_read_db(ssh_keygen_t)
 263 ')
 264
 265 ##############################
 266 #
 267 # ssh_keysign_t local policy
 268 #
 269
 270 tunable_policy(`allow_ssh_keysign',`
 271         allow ssh_keysign_t self:capability { setgid setuid };
 272         allow ssh_keysign_t self:unix_stream_socket create_socket_perms;
 273
 274         allow ssh_keysign_t sshd_key_t:file read_file_perms;
 275
 276         dev_read_urand(ssh_keysign_t)
 277
 278         files_read_etc_files(ssh_keysign_t)
 279 ')
 280
 281 optional_policy(`
 282         tunable_policy(`allow_ssh_keysign',`
 283                 nscd_socket_use(ssh_keysign_t)
 284         ')
 285 ')
 286
 287 #################################
 288 #
 289 # sshd local policy
 290 #
 291 # sshd_t is the domain for the sshd program.
 292 #
 293
 294 # so a tunnel can point to another ssh tunnel
 295 allow sshd_t self:netlink_route_socket r_netlink_socket_perms;
 296 allow sshd_t self:key { search link write };
 297 allow sshd_t self:process setcurrent;
 298
 299 kernel_search_key(sshd_t)
 300 kernel_link_key(sshd_t)
 301
 302 term_use_all_ptys(sshd_t)
 303 term_setattr_all_ptys(sshd_t)
 304 term_setattr_all_ttys(sshd_t)
 305 term_relabelto_all_ptys(sshd_t)
 306 term_use_ptmx(sshd_t)
 307
 308 # for X forwarding
 309 corenet_tcp_bind_xserver_port(sshd_t)
 310 corenet_sendrecv_xserver_server_packets(sshd_t)
 311
 312 userdom_read_user_home_content_files(sshd_t)
 313 userdom_read_user_home_content_symlinks(sshd_t)
 314 userdom_search_admin_dir(sshd_t)
 315 userdom_manage_tmp_role(system_r, sshd_t)
 316 userdom_spec_domtrans_unpriv_users(sshd_t)
 317 userdom_signal_unpriv_users(sshd_t)
 318
 319 tunable_policy(`sshd_forward_ports',`
 320         corenet_tcp_bind_all_unreserved_ports(sshd_t)
 321         corenet_tcp_connect_all_ports(sshd_t)
 322 ')
 323
 324 tunable_policy(`ssh_sysadm_login',`
 325         # Relabel and access ptys created by sshd
 326         # ioctl is necessary for logout() processing for utmp entry and for w to
 327         # display the tty.
 328         # some versions of sshd on the new SE Linux require setattr
 329         userdom_signal_all_users(sshd_t)
 330 ')
 331
 332 optional_policy(`
 333         amanda_search_var_lib(sshd_t)
 334 ')
 335
 336 optional_policy(`
 337         daemontools_service_domain(sshd_t, sshd_exec_t)
 338 ')
 339
 340 optional_policy(`
 341         kerberos_keytab_template(sshd, sshd_t)
 342 ')
 343
 344 optional_policy(`
 345         ftp_dyntrans_sftpd(sshd_t)
 346         ftp_dyntrans_anon_sftpd(sshd_t)
 347 ')
 348
 349 optional_policy(`
 350         gitosis_manage_lib_files(sshd_t)
 351 ')
 352
 353 optional_policy(`
 354         inetd_tcp_service_domain(sshd_t, sshd_exec_t)
 355 ')
 356
 357 optional_policy(`
 358         nx_read_home_files(sshd_t)
 359 ')
 360
 361 optional_policy(`
 362         rpm_use_script_fds(sshd_t)
 363 ')
 364
 365 optional_policy(`
 366         rssh_spec_domtrans(sshd_t)
 367         # For reading /home/user/.ssh
 368         rssh_read_ro_content(sshd_t)
 369 ')
 370
 371 optional_policy(`
 372         usermanage_domtrans_passwd(sshd_t)
 373         usermanage_read_crack_db(sshd_t)
 374 ')
 375
 376 optional_policy(`
 377         unconfined_shell_domtrans(sshd_t)
 378 ')
 379
 380 optional_policy(`
 381         xserver_domtrans_xauth(sshd_t)
 382 ')
 383
 384 ifdef(`TODO',`
 385         tunable_policy(`ssh_sysadm_login',`
 386                 # Relabel and access ptys created by sshd
 387                 # ioctl is necessary for logout() processing for utmp entry and for w to
 388                 # display the tty.
 389                 # some versions of sshd on the new SE Linux require setattr
 390                 allow sshd_t ptyfile:chr_file relabelto;
 391
 392                         optional_policy(`
 393                                 domain_trans(sshd_t, xauth_exec_t, userdomain)
 394                         ')
 395         ',`
 396                 optional_policy(`
 397                         domain_trans(sshd_t, xauth_exec_t, unpriv_userdomain)
 398                 ')
 399                 # Relabel and access ptys created by sshd
 400                 # ioctl is necessary for logout() processing for utmp entry and for w to
 401                 # display the tty.
 402                 # some versions of sshd on the new SE Linux require setattr
 403                 allow sshd_t userpty_type:chr_file { relabelto rw_inherited_chr_file_perms setattr_chr_file_perms };
 404         ')
 405 ') dnl endif TODO
 406
 407 ########################################
 408 #
 409 # ssh_keygen local policy
 410 #
 411
 412 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 413 # and by sysadm_t
 414
 415 dontaudit ssh_keygen_t self:capability sys_tty_config;
 416 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 417 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 418
 419 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 420 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 421
 422 kernel_read_kernel_sysctls(ssh_keygen_t)
 423
 424 fs_search_auto_mountpoints(ssh_keygen_t)
 425
 426 dev_read_sysfs(ssh_keygen_t)
 427 dev_read_urand(ssh_keygen_t)
 428
 429 term_dontaudit_use_console(ssh_keygen_t)
 430
 431 domain_use_interactive_fds(ssh_keygen_t)
 432
 433 files_read_etc_files(ssh_keygen_t)
 434
 435 init_use_fds(ssh_keygen_t)
 436 init_use_script_ptys(ssh_keygen_t)
 437
 438 auth_use_nsswitch(ssh_keygen_t)
 439
 440 logging_send_syslog_msg(ssh_keygen_t)
 441
 442 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 443
 444 optional_policy(`
 445         seutil_sigchld_newrole(ssh_keygen_t)
 446 ')
 447
 448 optional_policy(`
 449         udev_read_db(ssh_keygen_t)
 450 ')