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72 lines
3.2 KiB
72 lines
3.2 KiB
4 months ago
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# only HALs responsible for network hardware should have privileged
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# network capabilities
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neverallow {
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halserverdomain
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-hal_bluetooth_server
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-hal_can_controller_server
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-hal_wifi_server
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-hal_wifi_hostapd_server
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-hal_wifi_supplicant_server
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-hal_telephony_server
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-hal_uwb_server
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} self:global_capability_class_set { net_admin net_raw };
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# Unless a HAL's job is to communicate over the network, or control network
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# hardware, it should not be using network sockets.
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# NOTE: HALs for automotive devices have an exemption from this rule because in
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# a car it is common to have external modules and HALs need to communicate to
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# those modules using network. Using this exemption for non-automotive builds
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# will result in CTS failure.
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neverallow {
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halserverdomain
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-hal_automotive_socket_exemption
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-hal_can_controller_server
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-hal_tetheroffload_server
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-hal_wifi_server
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-hal_wifi_hostapd_server
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-hal_wifi_supplicant_server
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-hal_telephony_server
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-hal_uwb_server
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} domain:{ tcp_socket udp_socket rawip_socket } *;
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# The UWB HAL is not actually a networking HAL but may need to bring up and down
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# interfaces. Restrict it to only these networking operations.
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neverallow hal_uwb_server self:global_capability_class_set { net_raw };
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# Subset of socket_class_set likely to be usable for communication or accessible through net_admin.
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# udp_socket is required to use interface ioctls.
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neverallow hal_uwb_server domain:{ socket tcp_socket rawip_socket netlink_socket packet_socket key_socket netlink_route_socket netlink_tcpdiag_socket netlink_nflog_socket netlink_xfrm_socket netlink_selinux_socket netlink_audit_socket netlink_dnrt_socket netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket netlink_scsitransport_socket netlink_rdma_socket netlink_crypto_socket qipcrtr_socket xdp_socket } *;
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###
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# HALs are defined as an attribute and so a given domain could hypothetically
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# have multiple HALs in it (or even all of them) with the subsequent policy of
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# the domain comprised of the union of all the HALs.
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#
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# This is a problem because
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# 1) Security sensitive components should only be accessed by specific HALs.
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# 2) hwbinder_call and the restrictions it provides cannot be reasoned about in
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# the platform.
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# 3) The platform cannot reason about defense in depth if there are
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# monolithic domains etc.
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#
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# As an example, hal_keymaster and hal_gatekeeper can access the TEE and while
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# its OK for them to share a process its not OK with them to share processes
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# with other hals.
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#
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# The following neverallow rules, in conjuntion with CTS tests, assert that
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# these security principles are adhered to.
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#
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# Do not allow a hal to exec another process without a domain transition.
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# TODO remove exemptions.
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neverallow {
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halserverdomain
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-hal_dumpstate_server
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-hal_telephony_server
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} { file_type fs_type }:file execute_no_trans;
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# Do not allow a process other than init to transition into a HAL domain.
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neverallow { domain -init } halserverdomain:process transition;
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# Only allow transitioning to a domain by running its executable. Do not
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# allow transitioning into a HAL domain by use of seclabel in an
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# init.*.rc script.
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neverallow * halserverdomain:process dyntransition;
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