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