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