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)
32 lines
1.3 KiB
Text
32 lines
1.3 KiB
Text
# HwBinder IPC from client to server, and callbacks
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binder_call(hal_wifi_client, hal_wifi_server)
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binder_call(hal_wifi_server, hal_wifi_client)
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add_hwservice(hal_wifi_server, hal_wifi_hwservice)
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allow hal_wifi_client hal_wifi_hwservice:hwservice_manager find;
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r_dir_file(hal_wifi, proc_net_type)
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r_dir_file(hal_wifi, sysfs_type)
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set_prop(hal_wifi, exported_wifi_prop)
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set_prop(hal_wifi, wifi_prop)
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# allow hal wifi set interfaces up and down
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allow hal_wifi self:udp_socket create_socket_perms;
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allowxperm hal_wifi self:udp_socket ioctl { SIOCSIFFLAGS SIOCSIFHWADDR };
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allow hal_wifi self:global_capability_class_set { net_admin net_raw };
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# allow hal_wifi to speak to nl80211 in the kernel
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allow hal_wifi self:netlink_socket create_socket_perms_no_ioctl;
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# newer kernels (e.g. 4.4 but not 4.1) have a new class for sockets
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allow hal_wifi self:netlink_generic_socket create_socket_perms_no_ioctl;
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# hal_wifi writes firmware paths to this file.
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allow hal_wifi sysfs_wlan_fwpath:file { w_file_perms };
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# allow hal_wifi to access /proc/modules to check if Wi-Fi driver is loaded
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allow hal_wifi proc_modules:file { getattr open read };
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# allow hal_wifi to write into /data/vendor/tombstones/wifi
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userdebug_or_eng(`
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allow hal_wifi_server tombstone_wifi_data_file:dir rw_dir_perms;
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allow hal_wifi_server tombstone_wifi_data_file:file create_file_perms;
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')
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