490 lines
14 KiB
Plaintext
490 lines
14 KiB
Plaintext
## <summary>Secure shell client and server policy.</summary>
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#######################################
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## <summary>
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## The per user domain template for the ssh module.
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## </summary>
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## <desc>
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## <p>
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## This template creates a derived domains which are used
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## for ssh client sessions and user ssh agents. A derived
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## type is also created to protect the user ssh keys.
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## </p>
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## <p>
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## This template is invoked automatically for each user, and
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## generally does not need to be invoked directly
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## by policy writers.
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## </p>
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## </desc>
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## <param name="userdomain_prefix">
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## The prefix of the user domain (e.g., user
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## is the prefix for user_t).
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## </param>
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#
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template(`ssh_per_userdomain_template',`
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##############################
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#
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# Declarations
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#
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type $1_home_ssh_t; #, $1_file_type;
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files_type($1_home_ssh_t)
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role $1_r types $1_ssh_t;
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type $1_ssh_t; #, nscd_client_domain;
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domain_type($1_ssh_t)
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type $1_ssh_agent_t;
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domain_type($1_ssh_agent_t)
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role $1_r types $1_ssh_agent_t;
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##############################
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#
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# $1_ssh_t local policy
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#
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allow $1_ssh_t self:capability { setuid setgid dac_override dac_read_search };
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allow $1_ssh_t self:process ~{ ptrace setcurrent setexec setfscreate setrlimit execmem dyntransition };
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allow $1_ssh_t self:fd use;
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allow $1_ssh_t self:fifo_file { read getattr lock ioctl write append };
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allow $1_ssh_t self:unix_dgram_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown };
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allow $1_ssh_t self:unix_stream_socket { create ioctl read getattr write setattr append bind connect getopt setopt shutdown listen accept };
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allow $1_ssh_t self:unix_dgram_socket sendto;
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allow $1_ssh_t self:unix_stream_socket connectto;
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allow $1_ssh_t self:shm { associate getattr setattr create destroy read write lock unix_read unix_write };
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allow $1_ssh_t self:sem { associate getattr setattr create destroy read write unix_read unix_write };
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allow $1_ssh_t self:msgq { associate getattr setattr create destroy read write enqueue unix_read unix_write };
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allow $1_ssh_t self:msg { send receive };
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allow $1_ssh_t self:tcp_socket { create connect ioctl read getattr write setattr append bind getopt setopt shutdown };
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# Transition from the user domain to the derived domain.
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domain_auto_trans($1_t, ssh_exec_t, $1_ssh_t)
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# Read the ssh key file.
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allow $1_ssh_t sshd_key_t:file r_file_perms;
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# Access the ssh temporary files.
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allow $1_ssh_t sshd_tmp_t:dir create_dir_perms;
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allow $1_ssh_t sshd_tmp_t:file create_file_perms;
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files_create_tmp_files($1_ssh_t, sshd_tmp_t, { file dir })
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# for rsync
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allow $1_ssh_t $1_t:unix_stream_socket rw_socket_perms;
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allow $1_ssh_t $1_t:unix_stream_socket connectto;
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# user can manage the keys and config
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allow $1_t $1_home_ssh_t:dir rw_dir_perms;
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allow $1_t $1_home_ssh_t:file create_file_perms;
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allow $1_t $1_home_ssh_t:lnk_file create_lnk_perms;
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allow $1_t $1_home_ssh_t:sock_file create_file_perms;
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# ssh client can manage the keys and config
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allow $1_ssh_t $1_home_ssh_t:file create_file_perms;
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allow $1_ssh_t $1_home_ssh_t:lnk_file { getattr read };
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# ssh servers can read the user keys and config
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allow ssh_server $1_home_ssh_t:dir r_dir_perms;
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allow ssh_server $1_home_ssh_t:lnk_file r_file_perms;
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allow ssh_server $1_home_ssh_t:file r_file_perms;
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kernel_read_kernel_sysctl($1_ssh_t)
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corenet_tcp_sendrecv_all_if($1_ssh_t)
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corenet_raw_sendrecv_all_if($1_ssh_t)
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corenet_tcp_sendrecv_all_nodes($1_ssh_t)
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corenet_raw_sendrecv_all_nodes($1_ssh_t)
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corenet_tcp_sendrecv_all_ports($1_ssh_t)
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corenet_tcp_bind_all_nodes($1_ssh_t)
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dev_read_urand($1_ssh_t)
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fs_getattr_all_fs($1_ssh_t)
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fs_search_auto_mountpoints($1_ssh_t)
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# run helper programs - needed eg for x11-ssh-askpass
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corecmd_exec_shell($1_ssh_t)
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corecmd_exec_bin($1_ssh_t)
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domain_use_wide_inherit_fd($1_ssh_t)
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files_list_home($1_ssh_t)
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files_read_usr_files($1_ssh_t)
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files_read_etc_runtime_files($1_ssh_t)
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files_read_etc_files($1_ssh_t)
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libs_use_ld_so($1_ssh_t)
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libs_use_shared_libs($1_ssh_t)
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logging_send_syslog_msg($1_ssh_t)
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logging_read_generic_logs($1_ssh_t)
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miscfiles_read_localization($1_ssh_t)
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seutil_read_config($1_ssh_t)
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sysnet_read_config($1_ssh_t)
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userdom_use_unpriv_users_fd($1_ssh_t)
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tunable_policy(`use_dns',`
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allow $1_ssh_t self:udp_socket { create ioctl read getattr write setattr append bind getopt setopt shutdown connect };
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corenet_udp_sendrecv_all_if($1_ssh_t)
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corenet_udp_sendrecv_all_nodes($1_ssh_t)
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corenet_udp_sendrecv_dns_port($1_ssh_t)
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corenet_udp_bind_all_nodes($1_ssh_t)
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')
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tunable_policy(`use_nfs_home_dirs',`
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fs_manage_nfs_dirs($1_ssh_t)
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fs_manage_nfs_files($1_ssh_t)
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')
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tunable_policy(`use_samba_home_dirs',`
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fs_manage_cifs_dirs($1_ssh_t)
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fs_manage_cifs_files($1_ssh_t)
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')
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# for port forwarding
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tunable_policy(`user_tcp_server',`
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corenet_tcp_bind_ssh_port($1_ssh_t)
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')
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optional_policy(`nis.te',`
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nis_use_ypbind($1_ssh_t)
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')
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ifdef(`TODO',`
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allow $1 sbin_t:dir r_dir_perms;
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allow $1 sbin_t:notdevfile_class_set r_file_perms;
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if (read_default_t) {
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allow $1 default_t:dir r_dir_perms;
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allow $1 default_t:notdevfile_class_set r_file_perms;
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}
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# Read /var.
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allow $1_ssh_t var_t:dir r_dir_perms;
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allow $1_ssh_t var_t:notdevfile_class_set r_file_perms;
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# Read /var/run, /var/log.
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allow $1_ssh_t var_run_t:dir r_dir_perms;
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allow $1_ssh_t var_run_t:{ file lnk_file } r_file_perms;
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can_kerberos($1_ssh_t)
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allow $1_ssh_t $1_tmp_t:dir r_dir_perms;
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# Access the users .ssh directory.
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file_type_auto_trans({ sysadm_ssh_t $1_ssh_t }, $1_home_dir_t, $1_home_ssh_t, dir)
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file_type_auto_trans($1_ssh_t, $1_home_dir_t, $1_home_ssh_t, sock_file)
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allow sysadm_ssh_t $1_home_ssh_t:file create_file_perms;
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allow sysadm_ssh_t $1_home_ssh_t:lnk_file { getattr read };
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dontaudit $1_ssh_t $1_home_t:dir { getattr search };
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# for /bin/sh used to execute xauth
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dontaudit $1_ssh_t proc_t:dir search;
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dontaudit $1_ssh_t proc_t:{ lnk_file file } { getattr read };
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# Inherit and use descriptors from gnome-pty-helper.
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ifdef(`gnome-pty-helper.te', `allow $1_ssh_t $1_gph_t:fd use;')
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# Write to the user domain tty.
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allow $1_ssh_t $1_tty_device_t:chr_file { read write getattr ioctl };
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allow $1_ssh_t devpts_t:dir { read search getattr };
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allow $1_ssh_t $1_devpts_t:chr_file { read write getattr ioctl };
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# allow ps to show ssh
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can_ps($1_t, $1_ssh_t)
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ifdef(`xserver.te', `
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# Communicate with the X server.
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ifdef(`startx.te', `
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can_unix_connect($1_ssh_t, $1_xserver_t)
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allow $1_ssh_t $1_xserver_tmp_t:sock_file rw_file_perms;
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allow $1_ssh_t $1_xserver_tmp_t:dir search;
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')dnl end if startx
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ifdef(`xdm.te', `
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allow $1_ssh_t { xdm_xserver_tmp_t xdm_tmp_t }:dir search;
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allow $1_ssh_t { xdm_tmp_t }:sock_file write;
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')
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')dnl end if xserver
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#allow ssh to access keys stored on removable media
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# Should we have a boolean around this?
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files_search_mnt($1_ssh_t)
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r_dir_file($1_ssh_t, removable_t)
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ifdef(`xdm.te', `
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# should be able to remove these two later
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allow $1_ssh_t xdm_xserver_tmp_t:sock_file { read write };
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allow $1_ssh_t xdm_xserver_tmp_t:dir search;
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allow $1_ssh_t xdm_xserver_t:unix_stream_socket connectto;
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allow $1_ssh_t xdm_xserver_t:shm r_shm_perms;
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allow $1_ssh_t xdm_xserver_t:fd use;
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allow $1_ssh_t xdm_xserver_tmpfs_t:file read;
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allow $1_ssh_t xdm_t:fd use;
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')dnl end if xdm.te
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') dnl endif TODO
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##############################
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#
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# $1_ssh_agent_t local policy
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#
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allow $1_ssh_agent_t self:process setrlimit;
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allow $1_ssh_agent_t self:capability setgid;
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allow $1_ssh_agent_t { $1_ssh_agent_t $1_t }:process signull;
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allow $1_ssh_t $1_ssh_agent_t:unix_stream_socket connectto;
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domain_auto_trans($1_t, ssh_agent_exec_t, $1_ssh_agent_t)
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kernel_read_kernel_sysctl($1_ssh_agent_t)
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dev_read_urand($1_ssh_agent_t)
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dev_read_rand($1_ssh_agent_t)
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fs_search_auto_mountpoints($1_ssh_agent_t)
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domain_use_wide_inherit_fd($1_ssh_agent_t)
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files_read_etc_files($1_ssh_agent_t)
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files_read_etc_runtime_files($1_ssh_agent_t)
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libs_read_lib($1_ssh_agent_t)
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libs_use_ld_so($1_ssh_agent_t)
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libs_use_shared_libs($1_ssh_agent_t)
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logging_send_syslog_msg($1_ssh_agent_t)
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miscfiles_read_localization($1_ssh_agent_t)
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if (use_nfs_home_dirs) {
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fs_manage_nfs_files($1_ssh_agent_t)
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}
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if (use_samba_home_dirs) {
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fs_manage_cifs_files($1_ssh_agent_t)
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}
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optional_policy(`nis.te',`
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nis_use_ypbind($1_ssh_agent_t)
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')
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ifdef(`TODO',`
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# Write to the user domain tty.
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access_terminal($1_ssh_agent_t, $1)
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# Allow the user shell to signal the ssh program.
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allow $1_t $1_ssh_agent_t:process signal;
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# allow ps to show ssh
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can_ps($1_t, $1_ssh_agent_t)
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allow $1_ssh_agent_t proc_t:dir search;
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dontaudit $1_ssh_agent_t proc_t:{ lnk_file file } { getattr read };
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dontaudit $1_ssh_agent_t selinux_config_t:dir search;
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# Access the ssh temporary files. Should we have an own type here
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# to which only ssh, ssh-agent and ssh-add have access?
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allow $1_ssh_agent_t $1_tmp_t:dir r_dir_perms;
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file_type_auto_trans($1_ssh_agent_t, tmp_t, $1_tmp_t)
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# for ssh-add
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can_unix_connect($1_t, $1_ssh_agent_t)
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# transition back to normal privs upon exec
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domain_auto_trans($1_ssh_agent_t, { bin_t shell_exec_t $1_home_t }, $1_t)
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allow $1_ssh_agent_t bin_t:dir search;
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allow $1_ssh_agent_t bin_t:lnk_file read;
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if (use_nfs_home_dirs) {
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domain_auto_trans($1_ssh_agent_t, nfs_t, $1_t)
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}
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if (use_samba_home_dirs) {
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domain_auto_trans($1_ssh_agent_t, cifs_t, $1_t)
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}
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allow $1_ssh_agent_t { home_root_t $1_home_dir_t }:dir search;
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allow $1_ssh_t $1_tmp_t:sock_file write;
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ifdef(`xdm.te', `
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allow $1_ssh_agent_t xdm_t:fd use;
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allow $1_ssh_agent_t xdm_t:fifo_file { read write };
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# kdm: sigchld
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allow $1_ssh_agent_t xdm_t:process sigchld;
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')
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#
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# Allow command to ssh-agent > ~/.ssh_agent
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#
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allow $1_ssh_agent_t $1_home_t:file rw_file_perms;
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allow $1_ssh_agent_t $1_tmp_t:file rw_file_perms;
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# Allow the ssh program to communicate with ssh-agent.
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allow $1_ssh_t $1_tmp_t:sock_file write;
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allow $1_ssh_t $1_t:unix_stream_socket connectto;
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allow $1_ssh_t sshd_t:unix_stream_socket connectto;
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') dnl endif TODO
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')
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#######################################
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## <summary>
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## The template to define a ssh server.
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## </summary>
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## <desc>
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## <p>
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## This template creates a domains to be used for
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## creating a ssh server. This is typically done
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## to have multiple ssh servers of different sensitivities,
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## such as for an internal network-facing ssh server, and
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## a external network-facing ssh server.
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## </p>
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## </desc>
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## <param name="userdomain_prefix">
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## The prefix of the server domain (e.g., sshd
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## is the prefix for sshd_t).
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## </param>
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#
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template(`ssh_server_template', `
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type $1_t, ssh_server; #, nscd_client_domain;
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role system_r types $1_t;
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type $1_devpts_t;
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term_login_pty($1_devpts_t)
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type $1_var_run_t;
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files_pid_file($1_var_run_t)
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allow $1_t self:capability { kill sys_chroot sys_resource chown dac_override fowner fsetid setgid setuid sys_tty_config };
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allow $1_t self:fifo_file rw_file_perms;
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allow $1_t self:process { signal setsched setrlimit setexec };
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allow $1_t self:tcp_socket { listen accept create connect ioctl read getattr write setattr append bind getopt setopt shutdown };
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allow $1_t self:udp_socket { connect create ioctl read getattr write setattr append bind getopt setopt shutdown };
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allow $1_t $1_devpts_t:chr_file { rw_file_perms setattr getattr relabelfrom };
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term_create_pty($1_t,$1_devpts_t)
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allow $1_t $1_var_run_t:file create_file_perms;
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files_create_pid($1_t,$1_var_run_t,file)
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can_exec($1_t, sshd_exec_t)
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# Access key files
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allow $1_t sshd_key_t:file { getattr read };
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kernel_read_kernel_sysctl($1_t)
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corenet_tcp_sendrecv_all_if($1_t)
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corenet_udp_sendrecv_all_if($1_t)
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corenet_raw_sendrecv_all_if($1_t)
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corenet_tcp_sendrecv_all_nodes($1_t)
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corenet_udp_sendrecv_all_nodes($1_t)
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corenet_raw_sendrecv_all_nodes($1_t)
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corenet_udp_sendrecv_all_ports($1_t)
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corenet_tcp_sendrecv_all_ports($1_t)
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corenet_tcp_bind_all_nodes($1_t)
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corenet_udp_bind_all_nodes($1_t)
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dev_read_urand($1_t)
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fs_dontaudit_getattr_all_fs($1_t)
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selinux_get_fs_mount($1_t)
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selinux_validate_context($1_t)
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selinux_compute_access_vector($1_t)
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selinux_compute_create_context($1_t)
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selinux_compute_relabel_context($1_t)
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selinux_compute_user_contexts($1_t)
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auth_dontaudit_read_shadow($1_t)
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auth_domtrans_chk_passwd($1_t)
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auth_rw_login_records($1_t)
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auth_rw_lastlog($1_t)
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corecmd_read_bin_symlink($1_t)
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# for sshd subsystems, such as sftp-server.
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corecmd_getattr_bin_file($1_t)
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domain_wide_inherit_fd($1_t)
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domain_subj_id_change_exempt($1_t)
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domain_role_change_exempt($1_t)
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domain_obj_id_change_exempt($1_t)
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files_read_etc_files($1_t)
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files_read_etc_runtime_files($1_t)
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init_rw_script_pid($1_t)
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libs_use_ld_so($1_t)
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libs_use_shared_libs($1_t)
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logging_search_logs($1_t)
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logging_send_syslog_msg($1_t)
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miscfiles_read_localization($1_t)
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seutil_read_default_contexts($1_t)
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sysnet_read_config($1_t)
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userdom_search_all_users_home($1_t)
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tunable_policy(`use_nfs_home_dirs',`
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fs_read_nfs_files($1_t)
|
|
')
|
|
|
|
tunable_policy(`use_samba_home_dirs',`
|
|
fs_read_cifs_files($1_t)
|
|
')
|
|
|
|
optional_policy(`inetd.te',`
|
|
tunable_policy(`run_ssh_inetd',`
|
|
allow $1_t self:process signal;
|
|
files_list_pids($1_t)
|
|
',`
|
|
corenet_tcp_bind_ssh_port($1_t)
|
|
init_use_fd($1_t)
|
|
init_use_script_pty($1_t)
|
|
')
|
|
',`
|
|
# These rules should match the else block
|
|
# of the run_ssh_inetd tunable directly above
|
|
corenet_tcp_bind_ssh_port($1_t)
|
|
init_use_fd($1_t)
|
|
init_use_script_pty($1_t)
|
|
')
|
|
|
|
optional_policy(`mount.te', `
|
|
mount_send_nfs_client_request($1_t)
|
|
')
|
|
|
|
ifdef(`TODO',`
|
|
|
|
# Read /var.
|
|
allow $1_t var_t:dir getattr;
|
|
|
|
allow $1_t home_dir_type:dir getattr;
|
|
|
|
dontaudit sshd_t userpty_type:chr_file relabelfrom;
|
|
|
|
') dnl end TODO
|
|
')
|
|
|
|
########################################
|
|
## <summary>Read ssh server keys</summary>
|
|
## <param name="domain">
|
|
## The type of the process performing this action.
|
|
## </param>
|
|
#
|
|
interface(`ssh_dontaudit_read_server_keys',`
|
|
gen_require(`
|
|
type sshd_key_t;
|
|
class file { getattr read };
|
|
')
|
|
|
|
dontaudit $1 sshd_key_t:file { getattr read };
|
|
')
|