dc43f7cd84
The webview_zygote is a new unprivileged zygote and has its own sockets for listening to fork requests. However the webview_zygote does not run as root (though it does require certain capabilities) and only allows dyntransition to the isolated_app domain. Test: m Test: angler boots Bug: 21643067 Change-Id: I89a72ffe6dcb983c4a44048518efd7efb7ed8e83
83 lines
3.1 KiB
Text
83 lines
3.1 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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type webview_zygote, domain, mlstrustedsubject;
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type webview_zygote_exec, exec_type, file_type;
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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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# 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 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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# 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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