a7653ee2ed
This leaves only the existence of webview_zygote domain and its
executable's webview_zygote_exec file label as public API. All other
rules are implementation details of this domain's policy and are thus
now private.
Test: Device boots, with Multiproces WebView developer setting
enabled, apps with WebView work fine. No new denials.
Bug: 31364497
Change-Id: I179476c43a50863ee3b327fc5155847d992a040d
111 lines
4.2 KiB
Text
111 lines
4.2 KiB
Text
# webview_zygote is an auxiliary zygote process that is used to spawn
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# isolated_app processes for rendering untrusted web content.
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# The webview_zygote needs to be able to transition domains.
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typeattribute webview_zygote mlstrustedsubject;
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# When init launches the WebView zygote's executable, transition the
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# resulting process into webview_zygote domain.
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init_daemon_domain(webview_zygote)
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# Access to system files for SELinux contexts.
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allow webview_zygote rootfs:file r_file_perms;
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# Allow reading/executing installed binaries to enable preloading the
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# installed WebView implementation.
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allow webview_zygote apk_data_file:dir r_dir_perms;
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allow webview_zygote apk_data_file:file { r_file_perms execute };
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# Access to the WebView relro file.
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allow webview_zygote shared_relro_file:dir search;
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allow webview_zygote shared_relro_file:file r_file_perms;
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# Set the UID/GID of the process.
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allow webview_zygote self:capability { setgid setuid };
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# Drop capabilities from bounding set.
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allow webview_zygote self:capability setpcap;
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# Switch SELinux context to app domains.
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allow webview_zygote self:process setcurrent;
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allow webview_zygote isolated_app:process dyntransition;
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# For art.
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allow webview_zygote dalvikcache_data_file:dir r_dir_perms;
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allow webview_zygote dalvikcache_data_file:lnk_file r_file_perms;
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allow webview_zygote dalvikcache_data_file:file { r_file_perms execute };
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# Allow webview_zygote to stat the files that it opens. It must
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# be able to inspect them so that it can reopen them on fork
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# if necessary: b/30963384.
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allow webview_zygote debugfs_trace_marker:file getattr;
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# Allow webview_zygote to manage the pgroup of its children.
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allow webview_zygote system_server:process getpgid;
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# Interaction between the webview_zygote and its children.
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allow webview_zygote isolated_app:process setpgid;
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# Check validity of SELinux context before use.
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selinux_check_context(webview_zygote)
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# Check SELinux permissions.
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selinux_check_access(webview_zygote)
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#####
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##### Neverallow
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#####
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# Only permit transition to isolated_app.
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neverallow webview_zygote { domain -isolated_app }:process dyntransition;
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# Only setcon() transitions, no exec() based transitions, except for crash_dump.
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neverallow webview_zygote { domain -crash_dump }:process transition;
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# Must not exec() a program without changing domains.
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# Having said that, exec() above is not allowed.
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neverallow webview_zygote *:file execute_no_trans;
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# The only way to enter this domain is for init to exec() us.
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neverallow { domain -init } webview_zygote:process transition;
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neverallow * webview_zygote:process dyntransition;
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# Disallow write access to properties.
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neverallow webview_zygote property_socket:sock_file write;
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neverallow webview_zygote property_type:property_service set;
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# Should not have any access to app data files.
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neverallow webview_zygote {
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app_data_file
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system_app_data_file
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bluetooth_data_file
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nfc_data_file
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radio_data_file
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shell_data_file
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ephemeral_data_file
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}:file { rwx_file_perms };
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neverallow webview_zygote {
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service_manager_type
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-activity_service
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-webviewupdate_service
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}:service_manager find;
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# Isolated apps shouldn't be able to access the driver directly.
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neverallow webview_zygote gpu_device:chr_file { rwx_file_perms };
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# Do not allow webview_zygote access to /cache.
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neverallow webview_zygote cache_file:dir ~{ r_dir_perms };
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neverallow webview_zygote cache_file:file ~{ read getattr };
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# Do not allow most socket access. This is socket_class_set, excluding unix_dgram_socket,
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# unix_stream_socket, and netlink_selinux_socket.
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neverallow webview_zygote domain:{
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socket tcp_socket udp_socket rawip_socket netlink_socket packet_socket key_socket
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appletalk_socket netlink_route_socket netlink_firewall_socket netlink_tcpdiag_socket
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netlink_nflog_socket netlink_xfrm_socket netlink_audit_socket netlink_ip6fw_socket
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netlink_dnrt_socket netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket
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netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket
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netlink_generic_socket netlink_scsitransport_socket netlink_rdma_socket netlink_crypto_socket
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} *;
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# Do not allow access to Bluetooth-related system properties.
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# neverallow rules for Bluetooth-related data files are listed above.
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neverallow webview_zygote bluetooth_prop:file create_file_perms;
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