7a4af30b38
Files in /proc/net leak information. This change is the first step in
determining which files apps may use, whitelisting benign access, and
otherwise removing access while providing safe alternative APIs.
To that end, this change:
* Introduces the proc_net_type attribute which will assigned to any
new SELinux types in /proc/net to avoid removing access to privileged
processes. These processes may be evaluated later, but are lower
priority than apps.
* Labels /proc/net/{tcp,tcp6,udp,udp6} as proc_net_vpn due to existing
use by VPN apps. This may be replaced by an alternative API.
* Audits all other proc/net access for apps.
* Audits proc/net access for other processes which are currently
granted broad read access to /proc/net but should not be including
storaged, zygote, clatd, logd, preopt2cachename and vold.
Bug: 9496886
Bug: 68016944
Test: Boot Taimen-userdebug. On both wifi and cellular: stream youtube
navigate maps, send text message, make voice call, make video call.
Verify no avc "granted" messages in the logs.
Test: A few VPN apps including "VPN Monster", "Turbo VPN", and
"Freighter". Verify no logspam with the current setup.
Test: atest CtsNativeNetTestCases
Test: atest netd_integration_test
Test: atest QtaguidPermissionTest
Test: atest FileSystemPermissionTest
Change-Id: I7e49f796a25cf68bc698c6c9206e24af3ae11457
Merged-In: I7e49f796a25cf68bc698c6c9206e24af3ae11457
(cherry picked from commit 087318957f)
30 lines
1.4 KiB
Plaintext
30 lines
1.4 KiB
Plaintext
# HwBinder IPC from client to server
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binder_call(hal_wifi_supplicant_client, hal_wifi_supplicant_server)
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binder_call(hal_wifi_supplicant_server, hal_wifi_supplicant_client)
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add_hwservice(hal_wifi_supplicant_server, hal_wifi_supplicant_hwservice)
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allow hal_wifi_supplicant_client hal_wifi_supplicant_hwservice:hwservice_manager find;
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# in addition to ioctls whitelisted for all domains, grant hal_wifi_supplicant priv_sock_ioctls.
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allowxperm hal_wifi_supplicant self:udp_socket ioctl priv_sock_ioctls;
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r_dir_file(hal_wifi_supplicant, sysfs_type)
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r_dir_file(hal_wifi_supplicant, proc_net_type)
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allow hal_wifi_supplicant kernel:system module_request;
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allow hal_wifi_supplicant self:global_capability_class_set { setuid net_admin setgid net_raw };
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allow hal_wifi_supplicant cgroup:dir create_dir_perms;
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allow hal_wifi_supplicant self:netlink_route_socket nlmsg_write;
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allow hal_wifi_supplicant self:netlink_socket create_socket_perms_no_ioctl;
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allow hal_wifi_supplicant self:netlink_generic_socket create_socket_perms_no_ioctl;
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allow hal_wifi_supplicant self:packet_socket create_socket_perms;
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allowxperm hal_wifi_supplicant self:packet_socket ioctl { unpriv_sock_ioctls priv_sock_ioctls unpriv_tty_ioctls };
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###
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### neverallow rules
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###
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# wpa_supplicant should not trust any data from sdcards
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neverallow hal_wifi_supplicant_server sdcard_type:dir ~getattr;
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neverallow hal_wifi_supplicant_server sdcard_type:file *;
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