169 lines
4.8 KiB
Plaintext
169 lines
4.8 KiB
Plaintext
#
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# Macros for ssh domains.
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#
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#
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# Authors: Stephen Smalley <sds@epoch.ncsc.mil>
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# Russell Coker <russell@coker.com.au>
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# Thomas Bleher <ThomasBleher@gmx.de>
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#
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#
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# ssh_domain(domain_prefix)
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#
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# Define a derived domain for the ssh program when executed
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# by a user domain.
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#
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# The type declaration for the executable type for this program is
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# provided separately in domains/program/ssh.te.
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#
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undefine(`ssh_domain')
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ifdef(`ssh.te', `
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define(`ssh_domain',`
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# Derived domain based on the calling user domain and the program.
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type $1_ssh_t, domain, privlog, nscd_client_domain;
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type $1_home_ssh_t, file_type, $1_file_type, sysadmfile;
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allow $1_ssh_t autofs_t:dir { search getattr };
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if (use_nfs_home_dirs) {
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create_dir_file($1_ssh_t, nfs_t)
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}
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if (use_samba_home_dirs) {
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create_dir_file($1_ssh_t, cifs_t)
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}
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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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# The user role is authorized for this domain.
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role $1_r types $1_ssh_t;
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# Grant permissions within the domain.
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general_domain_access($1_ssh_t)
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# Use descriptors created by sshd
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allow $1_ssh_t privfd:fd use;
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uses_shlib($1_ssh_t)
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read_locale($1_ssh_t)
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# Get attributes of file systems.
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allow $1_ssh_t fs_type:filesystem getattr;
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base_file_read_access($1_ssh_t)
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# Read /var.
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r_dir_file($1_ssh_t, var_t)
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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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allow $1_ssh_t var_log_t:dir r_dir_perms;
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allow $1_ssh_t var_log_t:{ file lnk_file } r_file_perms;
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# Read /etc.
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r_dir_file($1_ssh_t, etc_t)
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allow $1_ssh_t etc_runtime_t:{ file lnk_file } r_file_perms;
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# Read /dev directories and any symbolic links.
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allow $1_ssh_t device_t:dir r_dir_perms;
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allow $1_ssh_t device_t:lnk_file r_file_perms;
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# Read /dev/urandom.
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allow $1_ssh_t urandom_device_t:chr_file r_file_perms;
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# Read and write /dev/null.
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allow $1_ssh_t { null_device_t zero_device_t }:chr_file rw_file_perms;
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# Grant permissions needed to create TCP and UDP sockets and
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# to access the network.
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can_network_client_tcp($1_ssh_t)
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allow $1_ssh_t ssh_port_t:tcp_socket name_connect;
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can_resolve($1_ssh_t)
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can_ypbind($1_ssh_t)
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can_kerberos($1_ssh_t)
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# for port forwarding
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if (user_tcp_server) {
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allow $1_ssh_t port_t:tcp_socket name_bind;
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}
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# Use capabilities.
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allow $1_ssh_t self:capability { setuid setgid dac_override dac_read_search };
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# run helper programs - needed eg for x11-ssh-askpass
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can_exec($1_ssh_t, { shell_exec_t bin_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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file_type_auto_trans($1_ssh_t, tmp_t, sshd_tmp_t)
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allow $1_ssh_t $1_tmp_t:dir r_dir_perms;
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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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# 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 $1_t $1_home_ssh_t:sock_file create_file_perms;
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allow { sysadm_ssh_t $1_ssh_t } $1_home_ssh_t:file create_file_perms;
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allow { sysadm_ssh_t $1_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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r_dir_file({ sshd_t sshd_extern_t }, $1_home_ssh_t)
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rw_dir_create_file($1_t, $1_home_ssh_t)
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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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access_terminal($1_ssh_t, $1)
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# Allow the user shell to signal the ssh program.
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allow $1_t $1_ssh_t:process signal;
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# allow ps to show ssh
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can_ps($1_t, $1_ssh_t)
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# Connect to X server
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x_client_domain($1_ssh, $1)
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ifdef(`ssh-agent.te', `
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ssh_agent_domain($1)
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')dnl end if ssh_agent.te
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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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allow $1_ssh_t mnt_t:dir search;
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r_dir_file($1_ssh_t, removable_t)
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type $1_ssh_keysign_t, domain, nscd_client_domain;
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role $1_r types $1_ssh_keysign_t;
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if (allow_ssh_keysign) {
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domain_auto_trans($1_ssh_t, ssh_keysign_exec_t, $1_ssh_keysign_t)
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allow $1_ssh_keysign_t sshd_key_t:file { getattr read };
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allow $1_ssh_keysign_t self:capability { setgid setuid };
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allow $1_ssh_keysign_t urandom_device_t:chr_file r_file_perms;
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uses_shlib($1_ssh_keysign_t)
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dontaudit $1_ssh_keysign_t selinux_config_t:dir search;
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dontaudit $1_ssh_keysign_t proc_t:dir search;
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dontaudit $1_ssh_keysign_t proc_t:{ lnk_file file } { getattr read };
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allow $1_ssh_keysign_t usr_t:dir search;
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allow $1_ssh_keysign_t etc_t:file { getattr read };
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allow $1_ssh_keysign_t self:dir search;
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allow $1_ssh_keysign_t self:file { getattr read };
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allow $1_ssh_keysign_t self:unix_stream_socket create_socket_perms;
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}
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')dnl end macro definition
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', `
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define(`ssh_domain',`')
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')dnl end if ssh.te
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