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