Commit Graph

72 Commits

Author SHA1 Message Date
topjohnwu
4dacffd7a1 Fix some issues with selinux rules 2020-09-04 00:03:24 -07:00
topjohnwu
b73d5753f2 Minor code cleanups 2020-09-02 02:49:32 -07:00
Simon Shi
2eee335b5f Track more sepolicy cil files.
Reference: https://android.googlesource.com/platform/system/core/+/refs/tags/android-r-beta-3/init/selinux.cpp
2020-08-31 21:38:55 -07:00
topjohnwu
97b72a5941 Revert to old SElinux rules on pre 8.0 devices
Fix #2910
2020-07-06 01:13:50 -07:00
topjohnwu
1e2f776b83 Move logging.hpp 2020-06-17 01:17:28 -07:00
topjohnwu
ec3705f2ed Redesign of MagiskSU's sepolicy model
Introduce new domain `magisk_client` and new file type `magisk_exec`.

Connection to magiskd's always-on socket is restricted to magisk_client
only. Whitelisted process domains can transit to magisk_client through
executing files labelled magisk_exec. The main magisk binary shall be
the only file labelled as magisk_exec throughout the whole system.
All processes thus are no longer allowed to connect to magiskd directly
without going through the proper magisk binary.

Connection failures are silenced from audit logs with dontaudit rules,
so crazy processes which traverse through all unix domain sockets to try
connection can no longer check logcat to know the actual reason behind
EACCES, leaking the denied process policy (which is u:r:magisk:s0).

This also allows us to remove many rules that open up holes in
untrusted_app domains that were used to make remote shell work properly.
Since all processes establishing the remote shell are now restricted to
the magisk_client domain, all these rules are moved to magisk_client.
This makes Magisk require fewer compromises in Android's security model.

Note: as of this commit, requesting new root access via Magisk Manager
will stop working as Magisk Manager can no longer communicate with
magiskd directly. This will be addressed in a future commit that
involves changes in both native and application side.
2020-06-03 23:29:42 -07:00
topjohnwu
ae0dcabf43 Fix typo in sepolicy.cpp 2020-06-03 03:11:10 -07:00
topjohnwu
2f824f59dc Better logging system
Use C++ magic to strip out debug logs at compile time
2020-06-01 04:15:37 -07:00
topjohnwu
c071ac8973 Remove unused code 2020-05-29 10:41:52 -07:00
topjohnwu
599ee57d39 Simplify sepolicy rules 2020-05-25 02:30:39 -07:00
topjohnwu
4499cebcd9 Support new sepolicy rules
Support declare new type with attribute and declare new attributes
2020-05-25 02:09:43 -07:00
topjohnwu
cd6eca1dc2 Optimize match-all-type rules
For match-all-type rules (e.g. "allow magisk * * *" used in Magisk),
we used to iterate and apply rules on all existing types. However, this
is actually unnecessary as all selinux types should have at least 1
attributes assigned to it (process types "domain", file context types
"file_type" etc.). This means in order to create rules that applies to
all types, we actually only need to create rules for all attributes.

This optimization SIGNIFICANTLY reduces the patched sepolicy that is
loaded into the kernel when running Magisk. For example on Pixel 4 XL
running Android R DP4, the sepolicy sizes are
patched (before) : 3455948
patched (after)  : 843176
stock            : 630229

The active sepolicy size actually impacts the performance of every single
operation in the operating system, because the larger the policies gets,
the longer it takes for the kernel to lookup and match rules.
2020-05-24 05:41:19 -07:00
topjohnwu
951273f8ef Cleanup some implementations 2020-05-24 04:16:40 -07:00
topjohnwu
0efa73d96c Update selinux libs 2020-05-23 05:02:26 -07:00
topjohnwu
f392ade78d Rewrite sepolicy.c in C++ 2020-05-23 00:18:25 -07:00
topjohnwu
0236ab887e Several statement parsing improvements
- Update help message to match the spec
- Make tokenization not seg fault in certain conditions
- Moar template + macro magic to reduce boilerplate
2020-05-22 14:05:56 -07:00
topjohnwu
d4baae411b Modernize magiskpolicy 2020-05-21 06:48:02 -07:00
vvb2060
d7b87fcb8e Add untrusted_app_29 for Android 11 2020-04-20 21:50:52 -07:00
topjohnwu
ba7cb47383 Make version reporting consistent 2020-03-23 01:17:13 -07:00
topjohnwu
a0998009c1 Small native code reorganization 2020-03-09 01:50:30 -07:00
topjohnwu
0d229dac3b Support Android 11 SELinux paths
This is NOT proper Android 11 support
2020-02-21 00:49:33 -08:00
topjohnwu
6180558068 Add support for genfscon sepolicy rules
Close #2367
2020-02-02 01:16:42 +08:00
topjohnwu
12fda29280 Add support for pre-init custom sepolicy patches
Close #1685
2019-12-13 06:05:12 -05:00
topjohnwu
af060b3132 General QoL changes 2019-12-13 00:37:06 -05:00
topjohnwu
490e6a6f23 Add new API to load sepolicy rule file 2019-12-09 04:14:30 -05:00
topjohnwu
34bb18448c Fix compile errors 2019-11-23 17:18:55 -05:00
topjohnwu
01253f050a Use smart pointers 2019-11-23 04:57:52 -05:00
topjohnwu
4f9a25ee89 Create generic streams on top of stdio
WIP
2019-11-20 21:48:49 -05:00
topjohnwu
bb9ce0e897 Make sepolicy dump more efficient 2019-11-20 03:47:15 -05:00
topjohnwu
d6fb9868bf Small sepolicy refactor and fixes 2019-11-19 05:20:18 -05:00
topjohnwu
9aff1a57d3 Cleanup headers 2019-11-19 02:04:47 -05:00
osm0sis
cba0d04000 magiskpolicy: rules: standardize update_engine sepolicy when rooted
The state of ROM A/B OTA addon.d-v2 support is an inconsistent mess currently:
- LineageOS builds userdebug with permissive update_engine domain, OmniROM builds userdebug with a more restricted update_engine domain, and CarbonROM builds user with a hybrid closer to Omni's
- addon.d-v2 scripts cannot function to the full extent they should when there is a more restricted update_engine domain sepolicy in place, which is likely why Lineage made update_engine completely permissive

Evidence for the above:
- many addon.d-v2 scripts only work (or fully work) on Lineage, see below
- Magisk's addon.d-v2 script would work on Lineage without issue, but would work on Carbon and Omni only if further allow rules were added for basic things like "file read" and "dir search" suggesting these ROMs' addon.d-v2 is severely limited
- Omni includes a /system/addon.d/69-gapps.sh script with the ROM itself (despite shipping without GApps), and with Magisk's more permissive sepolicy and no GApps installed it will remove important ROM files during OTA, resulting in a bootloop; the issue with shipping this script was therefore masked by Omni's overly restrictive update_engine sepolicy not allowing the script to function as intended

The solution:
- guarantee a consistent addon.d-v2 experience for users across ROMs when rooted with Magisk by making update_engine permissive as Lineage has
- hopefully ROMs can work together to come up with something standard for unrooted addon.d-v2 function
2019-09-23 07:55:25 -04:00
osm0sis
7058d5e4cd magiskpolicy: rules: fix writing to loop devices using upstream sepolicy 2019-07-14 22:09:26 -07:00
osm0sis
33c9f74508 magiskpolicy: rules: fix rootfs operations with SAR Magisk
- while many newer devices cannot allow / (system partition) to be mounted rw due to compressed fs (e.g. erofs) or logical partitions, it should remain possible to alter rootfs files/directories on those that previously allowed it
2019-07-07 12:33:20 -07:00
topjohnwu
ff3710de66 Minor code changes across all sources 2019-06-30 19:09:31 -07:00
topjohnwu
e29b712108 Start Magisk in SAR 2019-06-25 23:31:59 -07:00
topjohnwu
8d68ebb074 Revert ioctl rules 2019-04-29 21:25:57 -04:00
topjohnwu
5f53cfb4a9 Update sepolicy rules 2019-04-29 20:26:51 -04:00
topjohnwu
003e44fb84 Remove requirement to use early-init daemon
We used to construct /sbin tmpfs overlay in early-init stage after
SELinux is properly initialized. However the way it is implemented
(forking daemon from magiskinit with complicated file waiting triggers)
is extremely complicated and error prone.

This commit moves the construction of the sbin overlay to pre-init
stage. The catch is that since SELinux is not present at that point,
proper selabel has to be reconstructed afterwards. Some additional
SEPolicy rules are added to make sure init can access magisk binaries,
and the secontext relabeling task is assigned to the main Magisk daemon.
2019-04-24 00:13:48 -04:00
topjohnwu
86789a8694 Add logging in magiskinit 2019-04-04 00:26:16 -04:00
topjohnwu
f0240b1f06 Support Android Q new split sepolicy setup 2019-03-15 06:17:37 -04:00
topjohnwu
c134fb1939 Remove unnecessary rules 2019-03-08 04:21:23 -05:00
topjohnwu
6c3896079d Add zygote server notifier 2019-03-05 20:23:27 -05:00
corsicanu
0f61c627b1 Support deodexed ROM on Pie (Samsung)
- cc @abrahamgcc
2019-02-18 03:32:56 -05:00
topjohnwu
ed027ec3ee Refactor build flags 2019-02-12 05:17:02 -05:00
topjohnwu
71ecbb3af3 Clean/refactor includes 2019-02-10 03:57:51 -05:00
topjohnwu
c8491d008f Move sbin overlay creation to magiskinit 2019-02-09 01:51:46 -05:00
topjohnwu
c30faad838 Allow all binder operations for root processes 2019-02-02 13:24:55 -05:00
topjohnwu
3e4c12cf56 Migrate to STL 2019-01-19 23:59:37 -05:00
topjohnwu
2a2e1236fc Use magic macros 2018-12-01 03:53:58 -05:00