1# Networking service app 2typeattribute network_stack coredomain; 3typeattribute network_stack mlstrustedsubject; 4typeattribute network_stack bpfdomain; 5 6app_domain(network_stack); 7net_domain(network_stack); 8 9allow network_stack self:global_capability_class_set { 10 net_admin 11 net_bind_service 12 net_broadcast 13 net_raw 14}; 15 16# Allow access to net_admin ioctl, DHCP server uses SIOCSARP 17allowxperm network_stack self:udp_socket ioctl priv_sock_ioctls; 18 19# The DhcpClient uses packet_sockets 20allow network_stack self:packet_socket create_socket_perms_no_ioctl; 21 22# Monitor neighbors via netlink. 23allow network_stack self:netlink_route_socket nlmsg_write; 24 25# Use netlink uevent sockets. 26allow network_stack self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl; 27 28# give network_stack the same netlink permissions as netd 29allow network_stack self:netlink_nflog_socket create_socket_perms_no_ioctl; 30allow network_stack self:netlink_socket create_socket_perms_no_ioctl; 31allow network_stack self:netlink_generic_socket create_socket_perms_no_ioctl; 32 33allow network_stack app_api_service:service_manager find; 34allow network_stack dnsresolver_service:service_manager find; 35allow network_stack mdns_service:service_manager find; 36allow network_stack netd_service:service_manager find; 37allow network_stack network_watchlist_service:service_manager find; 38allow network_stack radio_service:service_manager find; 39allow network_stack system_config_service:service_manager find; 40allow network_stack radio_data_file:dir create_dir_perms; 41allow network_stack radio_data_file:file create_file_perms; 42 43binder_call(network_stack, netd); 44 45# in order to invoke side effect of close() on such a socket calling synchronize_rcu() 46# TODO: Remove this permission when 4.9 kernel is deprecated. 47allow network_stack self:key_socket create; 48# Java's Os.close() in libcore/luni/src/main/java/libcore/io/BlockGuardOs.java;l=100 49# calls if (fd.isSocket$()) if (isLingerSocket(fd)) ... 50dontaudit network_stack self:key_socket getopt; 51 52# Grant read permission of connectivity namespace system property prefix. 53get_prop(network_stack, device_config_connectivity_prop) 54 55# Create/use netlink_tcpdiag_socket to get tcp info 56allow network_stack self:netlink_tcpdiag_socket { create_socket_perms_no_ioctl nlmsg_read nlmsg_write }; 57############### Tethering Service app - Tethering.apk ############## 58hal_client_domain(network_stack, hal_tetheroffload) 59# Create and share netlink_netfilter_sockets for tetheroffload. 60allow network_stack self:netlink_netfilter_socket create_socket_perms_no_ioctl; 61allow network_stack network_stack_service:service_manager find; 62# allow Tethering(network_stack process) to run/update/read the eBPF maps to offload tethering traffic by eBPF. 63allow network_stack { fs_bpf_net_private fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared fs_bpf_tethering }:dir search; 64allow network_stack { fs_bpf_net_private fs_bpf_net_shared fs_bpf_netd_readonly fs_bpf_netd_shared fs_bpf_tethering }:file { getattr read write }; 65allow network_stack bpfloader:bpf { map_read map_write prog_run }; 66# allow Tethering(network_stack process) to read flag value in tethering_u_or_later_native namespace 67get_prop(network_stack, device_config_tethering_u_or_later_native_prop) 68 69# Use XFRM (IPsec) netlink sockets 70allow network_stack self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_write nlmsg_read }; 71 72# tun device used for 3rd party vpn apps and test network manager 73allow network_stack tun_device:chr_file rw_file_perms; 74allowxperm network_stack tun_device:chr_file ioctl { TUNGETIFF TUNSETIFF TUNSETLINK TUNSETCARRIER }; 75 76############### NEVER ALLOW RULES 77# This place is as good as any for these rules, 78# and it is probably the most appropriate because 79# network_stack itself is entirely mainline code. 80 81# T+: Only the bpfloader and the network_stack should ever touch 'fs_bpf_net_private' programs/maps. 82neverallow { domain -bpfloader -network_stack } fs_bpf_net_private:dir ~getattr; 83neverallow { domain -bpfloader -network_stack } fs_bpf_net_private:file *; 84 85# T+: Only the bpfloader, network_stack and system_server should ever touch 'fs_bpf_net_shared' programs/maps. 86neverallow { domain -bpfloader -network_stack -system_server } fs_bpf_net_shared:dir ~getattr; 87neverallow { domain -bpfloader -network_stack -system_server } fs_bpf_net_shared:file *; 88 89# T+: Only the bpfloader, netd, network_stack and system_server should ever touch 'fs_bpf_netd_readonly' programs/maps. 90# netd's access should be readonly 91neverallow { domain -bpfloader -netd -network_stack -system_server } fs_bpf_netd_readonly:dir ~getattr; 92neverallow { domain -bpfloader -netd -network_stack -system_server } fs_bpf_netd_readonly:file *; 93neverallow netd fs_bpf_netd_readonly:file write; 94 95# T+: Only the bpfloader, netd, netutils_wrapper, network_stack and system_server should ever touch 'fs_bpf_netd_shared' programs/maps. 96# netutils_wrapper requires access to be able to run iptables and only needs readonly access 97neverallow { domain -bpfloader -netd -netutils_wrapper -network_stack -system_server } fs_bpf_netd_shared:dir ~getattr; 98neverallow { domain -bpfloader -netd -netutils_wrapper -network_stack -system_server } fs_bpf_netd_shared:file *; 99neverallow netutils_wrapper fs_bpf_netd_shared:file write; 100 101# S+: Only the bpfloader and the network_stack should ever touch 'fs_bpf_tethering' programs/maps. 102neverallow { domain -bpfloader -network_stack } fs_bpf_tethering:dir ~getattr; 103neverallow { domain -bpfloader -network_stack } fs_bpf_tethering:file *; 104