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