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