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
  82 ifdef(`enable_mcs',`
  83         init_ranged_daemon_domain(sshd_t, sshd_exec_t, s0 - mcs_systemhigh)
  84 ')
  85
  86 ##############################
  87 #
  88 # SSH client local policy
  89 #
  90
  91 allow ssh_t self:capability { setuid setgid dac_override dac_read_search };
  92 allow ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem execstack execheap };
  93 allow ssh_t self:fd use;
  94 allow ssh_t self:fifo_file rw_fifo_file_perms;
  95 allow ssh_t self:unix_dgram_socket { create_socket_perms sendto };
  96 allow ssh_t self:unix_stream_socket { create_stream_socket_perms connectto };
  97 allow ssh_t self:shm create_shm_perms;
  98 allow ssh_t self:sem create_sem_perms;
  99 allow ssh_t self:msgq create_msgq_perms;
 100 allow ssh_t self:msg { send receive };
 101 allow ssh_t self:tcp_socket create_stream_socket_perms;
 102 can_exec(ssh_t, ssh_exec_t)
 103
 104 # Read the ssh key file.
 105 allow ssh_t sshd_key_t:file read_file_perms;
 106
 107 manage_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 108 manage_lnk_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 109 manage_fifo_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 110 manage_sock_files_pattern(ssh_t, ssh_tmpfs_t, ssh_tmpfs_t)
 111 fs_tmpfs_filetrans(ssh_t, ssh_tmpfs_t, { dir file lnk_file sock_file fifo_file })
 112
 113 manage_dirs_pattern(ssh_t, ssh_home_t, ssh_home_t)
 114 manage_sock_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 115 userdom_user_home_dir_filetrans(ssh_t, ssh_home_t, { dir sock_file })
 116 userdom_stream_connect(ssh_t)
 117
 118 # Allow the ssh program to communicate with ssh-agent.
 119 stream_connect_pattern(ssh_t, ssh_agent_tmp_t, ssh_agent_tmp_t, ssh_agent_type)
 120
 121 allow ssh_t sshd_t:unix_stream_socket connectto;
 122
 123 # ssh client can manage the keys and config
 124 manage_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 125 read_lnk_files_pattern(ssh_t, ssh_home_t, ssh_home_t)
 126
 127 # ssh servers can read the user keys and config
 128 manage_dirs_pattern(ssh_server, ssh_home_t, ssh_home_t)
 129 manage_files_pattern(ssh_server, ssh_home_t, ssh_home_t)
 130 userdom_user_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 131 userdom_admin_home_dir_filetrans(ssh_server, ssh_home_t, dir)
 132
 133 kernel_read_kernel_sysctls(ssh_t)
 134 kernel_read_system_state(ssh_t)
 135
 136 corenet_all_recvfrom_unlabeled(ssh_t)
 137 corenet_all_recvfrom_netlabel(ssh_t)
 138 corenet_tcp_sendrecv_generic_if(ssh_t)
 139 corenet_tcp_sendrecv_generic_node(ssh_t)
 140 corenet_tcp_sendrecv_all_ports(ssh_t)
 141 corenet_tcp_connect_ssh_port(ssh_t)
 142 corenet_sendrecv_ssh_client_packets(ssh_t)
 143 corenet_tcp_bind_generic_node(ssh_t)
 144 corenet_tcp_bind_all_unreserved_ports(ssh_t)
 145
 146 dev_read_urand(ssh_t)
 147
 148 fs_getattr_all_fs(ssh_t)
 149 fs_search_auto_mountpoints(ssh_t)
 150
 151 # run helper programs - needed eg for x11-ssh-askpass
 152 corecmd_exec_shell(ssh_t)
 153 corecmd_exec_bin(ssh_t)
 154
 155 domain_use_interactive_fds(ssh_t)
 156
 157 files_list_home(ssh_t)
 158 files_read_usr_files(ssh_t)
 159 files_read_etc_runtime_files(ssh_t)
 160 files_read_etc_files(ssh_t)
 161 files_read_var_files(ssh_t)
 162
 163 logging_send_syslog_msg(ssh_t)
 164 logging_read_generic_logs(ssh_t)
 165
 166 auth_use_nsswitch(ssh_t)
 167
 168 miscfiles_read_localization(ssh_t)
 169
 170 seutil_read_config(ssh_t)
 171
 172 userdom_dontaudit_list_user_home_dirs(ssh_t)
 173 userdom_search_user_home_dirs(ssh_t)
 174 # Write to the user domain tty.
 175 userdom_use_user_terminals(ssh_t)
 176 # needs to read krb/write tgt
 177 userdom_read_user_tmp_files(ssh_t)
 178 userdom_write_user_tmp_files(ssh_t)
 179 userdom_read_user_home_content_symlinks(ssh_t)
 180
 181 tunable_policy(`allow_ssh_keysign',`
 182         domtrans_pattern(ssh_t, ssh_keysign_exec_t, ssh_keysign_t)
 183 ')
 184
 185 tunable_policy(`use_nfs_home_dirs',`
 186         fs_manage_nfs_dirs(ssh_t)
 187         fs_manage_nfs_files(ssh_t)
 188 ')
 189
 190 tunable_policy(`use_samba_home_dirs',`
 191         fs_manage_cifs_dirs(ssh_t)
 192         fs_manage_cifs_files(ssh_t)
 193 ')
 194
 195 # for port forwarding
 196 tunable_policy(`user_tcp_server',`
 197         corenet_tcp_bind_ssh_port(ssh_t)
 198         corenet_tcp_bind_generic_node(ssh_t)
 199 ')
 200
 201 optional_policy(`
 202         xserver_user_x_domain_template(ssh, ssh_t, ssh_tmpfs_t)
 203         xserver_domtrans_xauth(ssh_t)
 204 ')
 205
 206 ########################################
 207 #
 208 # ssh_keygen local policy
 209 #
 210
 211 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 212 # and by sysadm_t
 213
 214 dontaudit ssh_keygen_t self:capability sys_tty_config;
 215 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 216 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 217
 218 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 219 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 220
 221 manage_dirs_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 222 manage_files_pattern(ssh_keygen_t, ssh_home_t, ssh_home_t)
 223 userdom_admin_home_dir_filetrans(ssh_keygen_t, ssh_home_t, dir)
 224
 225 kernel_read_kernel_sysctls(ssh_keygen_t)
 226
 227 fs_search_auto_mountpoints(ssh_keygen_t)
 228
 229 dev_read_sysfs(ssh_keygen_t)
 230 dev_read_urand(ssh_keygen_t)
 231
 232 term_dontaudit_use_console(ssh_keygen_t)
 233
 234 domain_use_interactive_fds(ssh_keygen_t)
 235
 236 files_read_etc_files(ssh_keygen_t)
 237
 238 init_use_fds(ssh_keygen_t)
 239 init_use_script_ptys(ssh_keygen_t)
 240
 241 logging_send_syslog_msg(ssh_keygen_t)
 242
 243 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 244
 245 optional_policy(`
 246         nscd_socket_use(ssh_keygen_t)
 247 ')
 248
 249 optional_policy(`
 250         seutil_sigchld_newrole(ssh_keygen_t)
 251 ')
 252
 253 optional_policy(`
 254         udev_read_db(ssh_keygen_t)
 255 ')
 256
 257 ##############################
 258 #
 259 # ssh_keysign_t local policy
 260 #
 261
 262 tunable_policy(`allow_ssh_keysign',`
 263         allow ssh_keysign_t self:capability { setgid setuid };
 264         allow ssh_keysign_t self:unix_stream_socket create_socket_perms;
 265
 266         allow ssh_keysign_t sshd_key_t:file read_file_perms;
 267
 268         dev_read_urand(ssh_keysign_t)
 269
 270         files_read_etc_files(ssh_keysign_t)
 271 ')
 272
 273 optional_policy(`
 274         tunable_policy(`allow_ssh_keysign',`
 275                 nscd_socket_use(ssh_keysign_t)
 276         ')
 277 ')
 278
 279 #################################
 280 #
 281 # sshd local policy
 282 #
 283 # sshd_t is the domain for the sshd program.
 284 #
 285
 286 # so a tunnel can point to another ssh tunnel
 287 allow sshd_t self:netlink_route_socket r_netlink_socket_perms;
 288 allow sshd_t self:key { search link write };
 289 allow sshd_t self:process setcurrent;
 290
 291 kernel_search_key(sshd_t)
 292 kernel_link_key(sshd_t)
 293
 294 term_use_all_ptys(sshd_t)
 295 term_setattr_all_ptys(sshd_t)
 296 term_setattr_all_ttys(sshd_t)
 297 term_relabelto_all_ptys(sshd_t)
 298 term_use_ptmx(sshd_t)
 299
 300 # for X forwarding
 301 corenet_tcp_bind_xserver_port(sshd_t)
 302 corenet_sendrecv_xserver_server_packets(sshd_t)
 303
 304 userdom_read_user_home_content_files(sshd_t)
 305 userdom_read_user_home_content_symlinks(sshd_t)
 306 userdom_search_admin_dir(sshd_t)
 307 userdom_manage_tmp_role(system_r, sshd_t)
 308 userdom_spec_domtrans_unpriv_users(sshd_t)
 309 userdom_signal_unpriv_users(sshd_t)
 310
 311 tunable_policy(`sshd_forward_ports',`
 312         corenet_tcp_bind_all_unreserved_ports(sshd_t)
 313         corenet_tcp_connect_all_ports(sshd_t)
 314 ')
 315
 316 tunable_policy(`ssh_sysadm_login',`
 317         # Relabel and access ptys created by sshd
 318         # ioctl is necessary for logout() processing for utmp entry and for w to
 319         # display the tty.
 320         # some versions of sshd on the new SE Linux require setattr
 321         userdom_signal_all_users(sshd_t)
 322 ')
 323
 324 optional_policy(`
 325         daemontools_service_domain(sshd_t, sshd_exec_t)
 326 ')
 327
 328 optional_policy(`
 329         kerberos_keytab_template(sshd, sshd_t)
 330 ')
 331
 332 optional_policy(`
 333         ftp_dyntrans_sftpd(sshd_t)
 334         ftp_dyntrans_anon_sftpd(sshd_t)
 335 ')
 336
 337 optional_policy(`
 338         gitosis_manage_lib_files(sshd_t)
 339 ')
 340
 341 optional_policy(`
 342         inetd_tcp_service_domain(sshd_t, sshd_exec_t)
 343 ')
 344
 345 optional_policy(`
 346         nx_read_home_files(sshd_t)
 347 ')
 348
 349 optional_policy(`
 350         rpm_use_script_fds(sshd_t)
 351 ')
 352
 353 optional_policy(`
 354         rssh_spec_domtrans(sshd_t)
 355         # For reading /home/user/.ssh
 356         rssh_read_ro_content(sshd_t)
 357 ')
 358
 359 optional_policy(`
 360         usermanage_domtrans_passwd(sshd_t)
 361         usermanage_read_crack_db(sshd_t)
 362 ')
 363
 364 optional_policy(`
 365         unconfined_shell_domtrans(sshd_t)
 366 ')
 367
 368 optional_policy(`
 369         xserver_domtrans_xauth(sshd_t)
 370 ')
 371
 372 ifdef(`TODO',`
 373         tunable_policy(`ssh_sysadm_login',`
 374                 # Relabel and access ptys created by sshd
 375                 # ioctl is necessary for logout() processing for utmp entry and for w to
 376                 # display the tty.
 377                 # some versions of sshd on the new SE Linux require setattr
 378                 allow sshd_t ptyfile:chr_file relabelto;
 379
 380                         optional_policy(`
 381                                 domain_trans(sshd_t, xauth_exec_t, userdomain)
 382                         ')
 383         ',`
 384                 optional_policy(`
 385                         domain_trans(sshd_t, xauth_exec_t, unpriv_userdomain)
 386                 ')
 387                 # Relabel and access ptys created by sshd
 388                 # ioctl is necessary for logout() processing for utmp entry and for w to
 389                 # display the tty.
 390                 # some versions of sshd on the new SE Linux require setattr
 391                 allow sshd_t userpty_type:chr_file { relabelto rw_inherited_chr_file_perms setattr_chr_file_perms };
 392         ')
 393 ') dnl endif TODO
 394
 395 ########################################
 396 #
 397 # ssh_keygen local policy
 398 #
 399
 400 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 401 # and by sysadm_t
 402
 403 dontaudit ssh_keygen_t self:capability sys_tty_config;
 404 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 405 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 406
 407 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 408 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 409
 410 kernel_read_kernel_sysctls(ssh_keygen_t)
 411
 412 fs_search_auto_mountpoints(ssh_keygen_t)
 413
 414 dev_read_sysfs(ssh_keygen_t)
 415 dev_read_urand(ssh_keygen_t)
 416
 417 term_dontaudit_use_console(ssh_keygen_t)
 418
 419 domain_use_interactive_fds(ssh_keygen_t)
 420
 421 files_read_etc_files(ssh_keygen_t)
 422
 423 init_use_fds(ssh_keygen_t)
 424 init_use_script_ptys(ssh_keygen_t)
 425
 426 auth_use_nsswitch(ssh_keygen_t)
 427
 428 logging_send_syslog_msg(ssh_keygen_t)
 429
 430 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 431
 432 optional_policy(`
 433         seutil_sigchld_newrole(ssh_keygen_t)
 434 ')
 435
 436 optional_policy(`
 437         udev_read_db(ssh_keygen_t)
 438 ')