netd.te

# network manager
type netd, domain, domain_deprecated, mlstrustedsubject;
type netd_exec, exec_type, file_type;

init_daemon_domain(netd)
net_domain(netd)

allow netd self:capability { net_admin net_raw kill };
# Note: fsetid is deliberately not included above. fsetid checks are
# triggered by chmod on a directory or file owned by a group other
# than one of the groups assigned to the current process to see if
# the setgid bit should be cleared, regardless of whether the setgid
# bit was even set.  We do not appear to truly need this capability
# for netd to operate.
dontaudit netd self:capability fsetid;

allow netd self:netlink_kobject_uevent_socket create_socket_perms;
allow netd self:netlink_route_socket nlmsg_write;
allow netd self:netlink_nflog_socket create_socket_perms;
allow netd self:netlink_socket create_socket_perms;
allow netd self:netlink_tcpdiag_socket { create_socket_perms nlmsg_read nlmsg_write };
allow netd self:netlink_generic_socket create_socket_perms;
allow netd self:netlink_netfilter_socket create_socket_perms;
allow netd shell_exec:file rx_file_perms;
allow netd system_file:file x_file_perms;
allow netd devpts:chr_file rw_file_perms;

# For /proc/sys/net/ipv[46]/route/flush.
allow netd proc_net:file write;

# For /sys/modules/bcmdhd/parameters/firmware_path
# XXX Split into its own type.
allow netd sysfs:file write;

# TODO: added to match above sysfs rule. Remove me?
allow netd sysfs_usb:file write;

# Needed to update /data/misc/wifi/hostapd.conf
# TODO: See what we can do to reduce the need for
# these capabilities
allow netd self:capability { dac_override chown fowner };
allow netd wifi_data_file:file create_file_perms;
allow netd wifi_data_file:dir rw_dir_perms;

# Needed to update /data/misc/net/rt_tables
allow netd net_data_file:file create_file_perms;
allow netd net_data_file:dir rw_dir_perms;

# Allow netd to spawn hostapd in it's own domain
domain_auto_trans(netd, hostapd_exec, hostapd)
allow netd hostapd:process signal;

# Allow netd to spawn dnsmasq in it's own domain
domain_auto_trans(netd, dnsmasq_exec, dnsmasq)
allow netd dnsmasq:process signal;

# Allow netd to start clatd in its own domain
domain_auto_trans(netd, clatd_exec, clatd)
allow netd clatd:process signal;

set_prop(netd, ctl_mdnsd_prop)

# Allow netd to publish a binder service and make binder calls.
binder_use(netd)
allow netd netd_service:service_manager add;
allow netd dumpstate:fifo_file  { getattr write };

# Allow netd to call into the system server so it can check permissions.
allow netd system_server:binder call;
allow netd permission_service:service_manager find;

# Allow netd to talk to the framework service which collects DNS query metrics.
allow netd dns_listener_service:service_manager find;

# Allow netd to operate on sockets that are passed to it.
allow netd netdomain:{tcp_socket udp_socket rawip_socket dccp_socket tun_socket} {read write getattr setattr getopt setopt};
allow netd netdomain:fd use;


###
### Neverallow rules
###
### netd should NEVER do any of this

# Block device access.
neverallow netd dev_type:blk_file { read write };

# ptrace any other app
neverallow netd { domain }:process ptrace;

# Write to /system.
neverallow netd system_file:dir_file_class_set write;

# Write to files in /data/data or system files on /data
neverallow netd { app_data_file system_data_file }:dir_file_class_set write;

# only system_server and dumpstate may interact with netd over binder
neverallow { domain -system_server -dumpstate } netd_service:service_manager find;
neverallow { domain -system_server -dumpstate } netd:binder call;
neverallow netd { domain -system_server -servicemanager userdebug_or_eng(`-su') }:binder call;