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 kernel_read_kernel_sysctls(ssh_keygen_t)
 222
 223 fs_search_auto_mountpoints(ssh_keygen_t)
 224
 225 dev_read_sysfs(ssh_keygen_t)
 226 dev_read_urand(ssh_keygen_t)
 227
 228 term_dontaudit_use_console(ssh_keygen_t)
 229
 230 domain_use_interactive_fds(ssh_keygen_t)
 231
 232 files_read_etc_files(ssh_keygen_t)
 233
 234 init_use_fds(ssh_keygen_t)
 235 init_use_script_ptys(ssh_keygen_t)
 236
 237 logging_send_syslog_msg(ssh_keygen_t)
 238
 239 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 240
 241 optional_policy(`
 242         nscd_socket_use(ssh_keygen_t)
 243 ')
 244
 245 optional_policy(`
 246         seutil_sigchld_newrole(ssh_keygen_t)
 247 ')
 248
 249 optional_policy(`
 250         udev_read_db(ssh_keygen_t)
 251 ')
 252
 253 ##############################
 254 #
 255 # ssh_keysign_t local policy
 256 #
 257
 258 tunable_policy(`allow_ssh_keysign',`
 259         allow ssh_keysign_t self:capability { setgid setuid };
 260         allow ssh_keysign_t self:unix_stream_socket create_socket_perms;
 261
 262         allow ssh_keysign_t sshd_key_t:file read_file_perms;
 263
 264         dev_read_urand(ssh_keysign_t)
 265
 266         files_read_etc_files(ssh_keysign_t)
 267 ')
 268
 269 optional_policy(`
 270         tunable_policy(`allow_ssh_keysign',`
 271                 nscd_socket_use(ssh_keysign_t)
 272         ')
 273 ')
 274
 275 #################################
 276 #
 277 # sshd local policy
 278 #
 279 # sshd_t is the domain for the sshd program.
 280 #
 281
 282 # so a tunnel can point to another ssh tunnel
 283 allow sshd_t self:netlink_route_socket r_netlink_socket_perms;
 284 allow sshd_t self:key { search link write };
 285 allow sshd_t self:process setcurrent;
 286
 287 kernel_search_key(sshd_t)
 288 kernel_link_key(sshd_t)
 289
 290 term_use_all_ptys(sshd_t)
 291 term_setattr_all_ptys(sshd_t)
 292 term_setattr_all_ttys(sshd_t)
 293 term_relabelto_all_ptys(sshd_t)
 294 term_use_ptmx(sshd_t)
 295
 296 # for X forwarding
 297 corenet_tcp_bind_xserver_port(sshd_t)
 298 corenet_sendrecv_xserver_server_packets(sshd_t)
 299
 300 userdom_read_user_home_content_files(sshd_t)
 301 userdom_read_user_home_content_symlinks(sshd_t)
 302 userdom_search_admin_dir(sshd_t)
 303 userdom_manage_tmp_role(system_r, sshd_t)
 304 userdom_spec_domtrans_unpriv_users(sshd_t)
 305 userdom_signal_unpriv_users(sshd_t)
 306
 307 tunable_policy(`sshd_forward_ports',`
 308         corenet_tcp_bind_all_unreserved_ports(sshd_t)
 309         corenet_tcp_connect_all_ports(sshd_t)
 310 ')
 311
 312 tunable_policy(`ssh_sysadm_login',`
 313         # Relabel and access ptys created by sshd
 314         # ioctl is necessary for logout() processing for utmp entry and for w to
 315         # display the tty.
 316         # some versions of sshd on the new SE Linux require setattr
 317         userdom_signal_all_users(sshd_t)
 318 ')
 319
 320 optional_policy(`
 321         daemontools_service_domain(sshd_t, sshd_exec_t)
 322 ')
 323
 324 optional_policy(`
 325         kerberos_keytab_template(sshd, sshd_t)
 326 ')
 327
 328 optional_policy(`
 329         ftp_dyntrans_sftpd(sshd_t)
 330         ftp_dyntrans_anon_sftpd(sshd_t)
 331 ')
 332
 333 optional_policy(`
 334         gitosis_manage_lib_files(sshd_t)
 335 ')
 336
 337 optional_policy(`
 338         inetd_tcp_service_domain(sshd_t, sshd_exec_t)
 339 ')
 340
 341 optional_policy(`
 342         nx_read_home_files(sshd_t)
 343 ')
 344
 345 optional_policy(`
 346         rpm_use_script_fds(sshd_t)
 347 ')
 348
 349 optional_policy(`
 350         rssh_spec_domtrans(sshd_t)
 351         # For reading /home/user/.ssh
 352         rssh_read_ro_content(sshd_t)
 353 ')
 354
 355 optional_policy(`
 356         usermanage_domtrans_passwd(sshd_t)
 357         usermanage_read_crack_db(sshd_t)
 358 ')
 359
 360 optional_policy(`
 361         unconfined_shell_domtrans(sshd_t)
 362 ')
 363
 364 optional_policy(`
 365         xserver_domtrans_xauth(sshd_t)
 366 ')
 367
 368 ifdef(`TODO',`
 369         tunable_policy(`ssh_sysadm_login',`
 370                 # Relabel and access ptys created by sshd
 371                 # ioctl is necessary for logout() processing for utmp entry and for w to
 372                 # display the tty.
 373                 # some versions of sshd on the new SE Linux require setattr
 374                 allow sshd_t ptyfile:chr_file relabelto;
 375
 376                         optional_policy(`
 377                                 domain_trans(sshd_t, xauth_exec_t, userdomain)
 378                         ')
 379         ',`
 380                 optional_policy(`
 381                         domain_trans(sshd_t, xauth_exec_t, unpriv_userdomain)
 382                 ')
 383                 # Relabel and access ptys created by sshd
 384                 # ioctl is necessary for logout() processing for utmp entry and for w to
 385                 # display the tty.
 386                 # some versions of sshd on the new SE Linux require setattr
 387                 allow sshd_t userpty_type:chr_file { relabelto rw_inherited_chr_file_perms setattr_chr_file_perms };
 388         ')
 389 ') dnl endif TODO
 390
 391 ########################################
 392 #
 393 # ssh_keygen local policy
 394 #
 395
 396 # ssh_keygen_t is the type of the ssh-keygen program when run at install time
 397 # and by sysadm_t
 398
 399 dontaudit ssh_keygen_t self:capability sys_tty_config;
 400 allow ssh_keygen_t self:process { sigchld sigkill sigstop signull signal };
 401 allow ssh_keygen_t self:unix_stream_socket create_stream_socket_perms;
 402
 403 allow ssh_keygen_t sshd_key_t:file manage_file_perms;
 404 files_etc_filetrans(ssh_keygen_t, sshd_key_t, file)
 405
 406 kernel_read_kernel_sysctls(ssh_keygen_t)
 407
 408 fs_search_auto_mountpoints(ssh_keygen_t)
 409
 410 dev_read_sysfs(ssh_keygen_t)
 411 dev_read_urand(ssh_keygen_t)
 412
 413 term_dontaudit_use_console(ssh_keygen_t)
 414
 415 domain_use_interactive_fds(ssh_keygen_t)
 416
 417 files_read_etc_files(ssh_keygen_t)
 418
 419 init_use_fds(ssh_keygen_t)
 420 init_use_script_ptys(ssh_keygen_t)
 421
 422 auth_use_nsswitch(ssh_keygen_t)
 423
 424 logging_send_syslog_msg(ssh_keygen_t)
 425
 426 userdom_dontaudit_use_unpriv_user_fds(ssh_keygen_t)
 427
 428 optional_policy(`
 429         seutil_sigchld_newrole(ssh_keygen_t)
 430 ')
 431
 432 optional_policy(`
 433         udev_read_db(ssh_keygen_t)
 434 ')