#
# Macros for ssh domains.
#

#
# Authors:  Stephen Smalley <sds@epoch.ncsc.mil>
#           Russell Coker <russell@coker.com.au>
#           Thomas Bleher <ThomasBleher@gmx.de>
#

# 
# ssh_domain(domain_prefix)
#
# Define a derived domain for the ssh program when executed
# by a user domain.
#
# The type declaration for the executable type for this program is
# provided separately in domains/program/ssh.te. 
#
undefine(`ssh_domain')
ifdef(`ssh.te', `
define(`ssh_domain',`
# Derived domain based on the calling user domain and the program.
type $1_ssh_t, domain, privlog, nscd_client_domain;
type $1_home_ssh_t, file_type, $1_file_type, sysadmfile;

allow $1_ssh_t autofs_t:dir { search getattr };
if (use_nfs_home_dirs) {
create_dir_file($1_ssh_t, nfs_t)
}
if (use_samba_home_dirs) {
create_dir_file($1_ssh_t, cifs_t)
}

# Transition from the user domain to the derived domain.
domain_auto_trans($1_t, ssh_exec_t, $1_ssh_t)

# The user role is authorized for this domain.
role $1_r types $1_ssh_t;

# Grant permissions within the domain.
general_domain_access($1_ssh_t)

# Use descriptors created by sshd
allow $1_ssh_t privfd:fd use;

uses_shlib($1_ssh_t)
read_locale($1_ssh_t)

# Get attributes of file systems.
allow $1_ssh_t fs_type:filesystem getattr;

base_file_read_access($1_ssh_t)

# Read /var.
r_dir_file($1_ssh_t, var_t)

# Read /var/run, /var/log.
allow $1_ssh_t var_run_t:dir r_dir_perms;
allow $1_ssh_t var_run_t:{ file lnk_file } r_file_perms;
allow $1_ssh_t var_log_t:dir r_dir_perms;
allow $1_ssh_t var_log_t:{ file lnk_file } r_file_perms;

# Read /etc.
r_dir_file($1_ssh_t, etc_t)
allow $1_ssh_t etc_runtime_t:{ file lnk_file } r_file_perms;

# Read /dev directories and any symbolic links.
allow $1_ssh_t device_t:dir r_dir_perms;
allow $1_ssh_t device_t:lnk_file r_file_perms;

# Read /dev/urandom.
allow $1_ssh_t urandom_device_t:chr_file r_file_perms;

# Read and write /dev/null.
allow $1_ssh_t { null_device_t zero_device_t }:chr_file rw_file_perms;

# Grant permissions needed to create TCP and UDP sockets and
# to access the network.
can_network_client_tcp($1_ssh_t)
allow $1_ssh_t ssh_port_t:tcp_socket name_connect;
can_resolve($1_ssh_t)
can_ypbind($1_ssh_t)
can_kerberos($1_ssh_t)

# for port forwarding
if (user_tcp_server) {
allow $1_ssh_t port_t:tcp_socket name_bind;
}

# Use capabilities.
allow $1_ssh_t self:capability { setuid setgid dac_override dac_read_search };

# run helper programs - needed eg for x11-ssh-askpass
can_exec($1_ssh_t, { shell_exec_t bin_t })

# Read the ssh key file.
allow $1_ssh_t sshd_key_t:file r_file_perms;

# Access the ssh temporary files.
file_type_auto_trans($1_ssh_t, tmp_t, sshd_tmp_t)
allow $1_ssh_t $1_tmp_t:dir r_dir_perms;

# for rsync
allow $1_ssh_t $1_t:unix_stream_socket rw_socket_perms;

# Access the users .ssh directory.
file_type_auto_trans({ sysadm_ssh_t $1_ssh_t }, $1_home_dir_t, $1_home_ssh_t, dir)
file_type_auto_trans($1_ssh_t, $1_home_dir_t, $1_home_ssh_t, sock_file)
allow $1_t $1_home_ssh_t:sock_file create_file_perms;
allow { sysadm_ssh_t $1_ssh_t } $1_home_ssh_t:file create_file_perms;
allow { sysadm_ssh_t $1_ssh_t } $1_home_ssh_t:lnk_file { getattr read };
dontaudit $1_ssh_t $1_home_t:dir { getattr search };
r_dir_file({ sshd_t sshd_extern_t }, $1_home_ssh_t)
rw_dir_create_file($1_t, $1_home_ssh_t)

# for /bin/sh used to execute xauth
dontaudit $1_ssh_t proc_t:dir search;
dontaudit $1_ssh_t proc_t:{ lnk_file file } { getattr read };

# Inherit and use descriptors from gnome-pty-helper.
ifdef(`gnome-pty-helper.te', `allow $1_ssh_t $1_gph_t:fd use;')

# Write to the user domain tty.
access_terminal($1_ssh_t, $1)

# Allow the user shell to signal the ssh program.
allow $1_t $1_ssh_t:process signal;
# allow ps to show ssh
can_ps($1_t, $1_ssh_t)

# Connect to X server
x_client_domain($1_ssh, $1)

ifdef(`ssh-agent.te', `
ssh_agent_domain($1)
')dnl end if ssh_agent.te

#allow ssh to access keys stored on removable media
# Should we have a boolean around this?
allow $1_ssh_t mnt_t:dir search;
r_dir_file($1_ssh_t, removable_t) 

type $1_ssh_keysign_t, domain, nscd_client_domain;
role $1_r types $1_ssh_keysign_t;

if (allow_ssh_keysign) {
domain_auto_trans($1_ssh_t, ssh_keysign_exec_t, $1_ssh_keysign_t)
allow $1_ssh_keysign_t sshd_key_t:file { getattr read };
allow $1_ssh_keysign_t self:capability { setgid setuid };
allow $1_ssh_keysign_t urandom_device_t:chr_file r_file_perms;
uses_shlib($1_ssh_keysign_t)
dontaudit $1_ssh_keysign_t selinux_config_t:dir search;
dontaudit $1_ssh_keysign_t proc_t:dir search;
dontaudit $1_ssh_keysign_t proc_t:{ lnk_file file } { getattr read };
allow $1_ssh_keysign_t usr_t:dir search;
allow $1_ssh_keysign_t etc_t:file { getattr read };
allow $1_ssh_keysign_t self:dir search;
allow $1_ssh_keysign_t self:file { getattr read };
allow $1_ssh_keysign_t self:unix_stream_socket create_socket_perms;
}

')dnl end macro definition
', `

define(`ssh_domain',`')

')dnl end if ssh.te