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186 lines
6.5 KiB
186 lines
6.5 KiB
# network manager
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type netd, domain, mlstrustedsubject;
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type netd_exec, system_file_type, exec_type, file_type;
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net_domain(netd)
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# in addition to ioctls allowlisted for all domains, grant netd priv_sock_ioctls.
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allowxperm netd self:udp_socket ioctl priv_sock_ioctls;
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r_dir_file(netd, cgroup)
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allow netd system_server:fd use;
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allow netd self:global_capability_class_set { net_admin net_raw kill };
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# Note: fsetid is deliberately not included above. fsetid checks are
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# triggered by chmod on a directory or file owned by a group other
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# than one of the groups assigned to the current process to see if
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# the setgid bit should be cleared, regardless of whether the setgid
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# bit was even set. We do not appear to truly need this capability
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# for netd to operate.
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dontaudit netd self:global_capability_class_set fsetid;
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# Allow netd to open /dev/tun, set it up and pass it to clatd
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allow netd tun_device:chr_file rw_file_perms;
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allowxperm netd tun_device:chr_file ioctl { TUNGETIFF TUNSETIFF };
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allow netd self:tun_socket create;
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allow netd self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
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allow netd self:netlink_route_socket nlmsg_write;
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allow netd self:netlink_nflog_socket create_socket_perms_no_ioctl;
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allow netd self:netlink_socket create_socket_perms_no_ioctl;
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allow netd self:netlink_tcpdiag_socket { create_socket_perms_no_ioctl nlmsg_read nlmsg_write };
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allow netd self:netlink_generic_socket create_socket_perms_no_ioctl;
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allow netd self:netlink_netfilter_socket create_socket_perms_no_ioctl;
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allow netd shell_exec:file rx_file_perms;
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allow netd system_file:file x_file_perms;
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not_full_treble(`allow netd vendor_file:file x_file_perms;')
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allow netd devpts:chr_file rw_file_perms;
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# Acquire advisory lock on /system/etc/xtables.lock
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allow netd system_file:file lock;
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# Allow netd to write to qtaguid ctrl file.
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# TODO: Add proper rules to prevent other process to access qtaguid_proc file
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# after migration complete
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allow netd proc_qtaguid_ctrl:file rw_file_perms;
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# Allow netd to read /dev/qtaguid. This is the same privilege level that normal apps have.
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allow netd qtaguid_device:chr_file r_file_perms;
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r_dir_file(netd, proc_net_type)
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# For /proc/sys/net/ipv[46]/route/flush.
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allow netd proc_net_type:file rw_file_perms;
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# Enables PppController and interface enumeration (among others)
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allow netd sysfs:dir r_dir_perms;
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r_dir_file(netd, sysfs_net)
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# Allows setting interface MTU
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allow netd sysfs_net:file w_file_perms;
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# TODO: added to match above sysfs rule. Remove me?
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allow netd sysfs_usb:file write;
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r_dir_file(netd, cgroup_bpf)
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allow netd fs_bpf:dir search;
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allow netd fs_bpf:file { read write };
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# TODO: netd previously thought it needed these permissions to do WiFi related
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# work. However, after all the WiFi stuff is gone, we still need them.
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# Why?
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allow netd self:global_capability_class_set { dac_override dac_read_search chown };
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# Needed to update /data/misc/net/rt_tables
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allow netd net_data_file:file create_file_perms;
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allow netd net_data_file:dir rw_dir_perms;
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allow netd self:global_capability_class_set fowner;
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# Needed to lock the iptables lock.
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allow netd system_file:file lock;
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# Allow netd to spawn dnsmasq in it's own domain
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allow netd dnsmasq:process signal;
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set_prop(netd, ctl_mdnsd_prop)
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set_prop(netd, netd_stable_secret_prop)
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# Allow netd to publish a binder service and make binder calls.
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binder_use(netd)
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add_service(netd, netd_service)
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add_service(netd, dnsresolver_service)
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allow netd dumpstate:fifo_file { getattr write };
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# Allow netd to call into the system server so it can check permissions.
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allow netd system_server:binder call;
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allow netd permission_service:service_manager find;
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# Allow netd to talk to the framework service which collects netd events.
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allow netd netd_listener_service:service_manager find;
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# Allow netd to operate on sockets that are passed to it.
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allow netd netdomain:{
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icmp_socket
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tcp_socket
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udp_socket
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rawip_socket
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tun_socket
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} { read write getattr setattr getopt setopt };
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allow netd netdomain:fd use;
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# give netd permission to read and write netlink xfrm
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allow netd self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_write nlmsg_read };
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# Allow netd to register as hal server.
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add_hwservice(netd, system_net_netd_hwservice)
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hwbinder_use(netd)
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get_prop(netd, hwservicemanager_prop)
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get_prop(netd, device_config_netd_native_prop)
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###
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### Neverallow rules
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###
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### netd should NEVER do any of this
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# Block device access.
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neverallow netd dev_type:blk_file { read write };
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# ptrace any other app
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neverallow netd { domain }:process ptrace;
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# Write to /system.
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neverallow netd system_file:dir_file_class_set write;
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# Write to files in /data/data or system files on /data
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neverallow netd { app_data_file privapp_data_file system_data_file }:dir_file_class_set write;
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# only system_server, dumpstate and network stack app may find netd service
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neverallow {
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domain
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-system_server
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-dumpstate
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-network_stack
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-netd
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-netutils_wrapper
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} netd_service:service_manager find;
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# only system_server, dumpstate and network stack app may find dnsresolver service
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neverallow {
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domain
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-system_server
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-dumpstate
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-network_stack
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-netd
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-netutils_wrapper
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} dnsresolver_service:service_manager find;
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# apps may not interact with netd over binder.
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neverallow { appdomain -network_stack } netd:binder call;
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neverallow netd { appdomain -network_stack userdebug_or_eng(`-su') }:binder call;
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# persist.netd.stable_secret contains RFC 7217 secret key which should never be
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# leaked to other processes. Make sure it never leaks.
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neverallow { domain -netd -init -dumpstate } netd_stable_secret_prop:file r_file_perms;
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# We want to ensure that no other process ever tries tampering with persist.netd.stable_secret,
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# the RFC 7217 secret key managed by netd. Doing so could compromise user privacy.
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neverallow { domain -netd -init } netd_stable_secret_prop:property_service set;
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# If an already existing file is opened with O_CREATE, the kernel might generate
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# a false report of a create denial. Silence these denials and make sure that
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# inappropriate permissions are not granted.
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neverallow netd proc_net:dir no_w_dir_perms;
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dontaudit netd proc_net:dir write;
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neverallow netd sysfs_net:dir no_w_dir_perms;
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dontaudit netd sysfs_net:dir write;
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# Netd should not have SYS_ADMIN privs.
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neverallow netd self:capability sys_admin;
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dontaudit netd self:capability sys_admin;
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# Netd should not have SYS_MODULE privs, nor should it be requesting module loads
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# (things it requires should be built directly into the kernel)
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dontaudit netd self:capability sys_module;
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dontaudit netd kernel:system module_request;
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