netd.te

# network manager
type netd, domain, 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 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;

# Set dhcp lease for PAN connection
set_prop(netd, dhcp_prop)
set_prop(netd, system_prop)
auditallow netd system_prop:property_service set;

# Connect to PAN
domain_auto_trans(netd, dhcp_exec, dhcp)
allow netd dhcp:process signal;

# 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 create_dir_perms;
allow netd wifi_data_file:sock_file { create setattr unlink write };

# Allow netd to chmod dir /data/misc/dhcp
allow netd dhcp_data_file:dir create_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 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;