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platform_system_sepolicy/recovery.te

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Add a domain for the recovery console. Define a domain for use by the recovery init.rc file for /sbin/recovery. Start with a copy of the kernel domain rules since that is what /sbin/recovery was previously running in, and then add rules as appropriate. Change-Id: Ie3d86547d5be0b68dd1875a97afe1e00fc3e4da1 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 15:45:45 +01:00
# recovery console (used in recovery init.rc for /sbin/recovery)
type recovery, domain;
allow recovery rootfs:file entrypoint;
unconfined_domain(recovery)
Remove MAC capabilities from unconfined domains. Linux defines two capabilities for Mandatory Access Control (MAC) security modules, CAP_MAC_OVERRIDE (override MAC access restrictions) and CAP_MAC_ADMIN (allow MAC configuration or state changes). SELinux predates these capabilities and did not originally use them, but later made use of CAP_MAC_ADMIN as a way to control the ability to set security context values unknown to the currently loaded SELinux policy on files. That facility is used in Linux for e.g. livecd creation where a file security context that is being set on a generated filesystem is not known to the build host policy. Internally, files with such labels are treated as having the unlabeled security context for permission checking purposes until/unless the context is later defined through a policy reload. CAP_MAC_OVERRIDE is never checked by SELinux, so it never needs to be allowed. CAP_MAC_ADMIN is only checked if setting an unknown security context value; the only legitimate use I can see in Android is the recovery console, where a context may need to be set on /system that is not defined in the recovery policy. Remove these capabilities from unconfined domains, allow mac_admin for the recovery domain, and add neverallow rules. Change-Id: Ief673e12bc3caf695f3fb67cabe63e68f5f58150 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-30 19:23:08 +01:00
allow recovery self:capability2 mac_admin;
Remove /system write from unconfined Don't allow writes to /system from unconfined domains. /system is always mounted read-only, and no process should ever need to write there. Allow recovery to write to /system. This is needed to apply OTA images. Change-Id: I11aa8bd0c3b7f53ebe83806a0547ab8d5f25f3c9
2014-05-20 20:09:16 +02:00
allow recovery {dev_type -kmem_device}:dir_file_class_set relabelto;
allow recovery {fs_type file_type}:dir_file_class_set relabelto;
Add a domain for the recovery console. Define a domain for use by the recovery init.rc file for /sbin/recovery. Start with a copy of the kernel domain rules since that is what /sbin/recovery was previously running in, and then add rules as appropriate. Change-Id: Ie3d86547d5be0b68dd1875a97afe1e00fc3e4da1 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 15:45:45 +01:00
allow recovery unlabeled:filesystem mount;
Remove mount-related permissions from unconfined domains. Only allow to specific domains as required, and add a neverallow to prevent allowing it to other domains not explicitly whitelisted. sdcard_type is exempted from the neverallow since more domains require the ability to mount it, including device-specific domains. Change-Id: Ia6476d1c877f5ead250749fb12bff863be5e9f27 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-02-10 19:29:38 +01:00
allow recovery fs_type:filesystem *;
Add a domain for the recovery console. Define a domain for use by the recovery init.rc file for /sbin/recovery. Start with a copy of the kernel domain rules since that is what /sbin/recovery was previously running in, and then add rules as appropriate. Change-Id: Ie3d86547d5be0b68dd1875a97afe1e00fc3e4da1 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 15:45:45 +01:00
Remove /system write from unconfined Don't allow writes to /system from unconfined domains. /system is always mounted read-only, and no process should ever need to write there. Allow recovery to write to /system. This is needed to apply OTA images. Change-Id: I11aa8bd0c3b7f53ebe83806a0547ab8d5f25f3c9
2014-05-20 20:09:16 +02:00
allow recovery exec_type:{ file dir lnk_file } { create write setattr relabelfrom relabelto append unlink link rename };
allow recovery system_file:{ file dir lnk_file } { create write setattr relabelfrom relabelto append unlink link rename };
Remove block device access from unconfined domains. Only allow to domains as required and amend the existing neverallow on block_device:blk_file to replace the exemption for unconfineddomain with an explicit whitelist. The neverallow does not check other device types as specific ones may need to be writable by device-specific domains. Change-Id: I0f2f1f565e886ae110a719a08aa3a1e7e9f23e8c Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-02-11 20:40:14 +01:00
# Required to e.g. wipe userdata/cache.
allow recovery dev_type:blk_file rw_file_perms;
Add a domain for the recovery console. Define a domain for use by the recovery init.rc file for /sbin/recovery. Start with a copy of the kernel domain rules since that is what /sbin/recovery was previously running in, and then add rules as appropriate. Change-Id: Ie3d86547d5be0b68dd1875a97afe1e00fc3e4da1 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 15:45:45 +01:00
allow recovery self:process execmem;
ashmem_device is a character device, not a regular file. Change-Id: Ie3d73d2c8d5c73e8bd359123f6fd3c006f332323 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 21:32:11 +01:00
allow recovery ashmem_device:chr_file execute;
Allow recovery to execute ashmem_device and tmpfs. Requires execmem and ashmem_device:chr_file execute similar to bootanim presumably for the display. Did not see any cache_file execute denials and do not see any exec of /cache files in the code, only reading/interpreting scripts, so I removed cache_file rx_file_perms. Did not see any tmpfs execute denials in /proc/last_kmsg but the source code appears to extract the update-binary to a tmpfs mount in /tmp and then exec it. So I retained that rule. Tested with adb sideload. Change-Id: I8ca5f2cd390be1adf063f16e6280cc4cd1833c0e Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-01-13 20:03:47 +01:00
allow recovery tmpfs:file rx_file_perms;
Restrict requesting contexts other than policy-defined defaults. Writing to the /proc/self/attr files (encapsulated by the libselinux set*con functions) enables a program to request a specific security context for various operations instead of the policy-defined defaults. The security context specified using these calls is checked by an operation-specific permission, e.g. dyntransition for setcon, transition for setexeccon, create for setfscreatecon or setsockcreatecon, but the ability to request a context at all is controlled by a process permission. Omit these permissions from domain.te and only add them back where required so that only specific domains can even request a context other than the default defined by the policy. Change-Id: I6a2fb1279318625a80f3ea8e3f0932bdbe6df676 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-23 17:26:19 +02:00
# Use setfscreatecon() to label files for OTA updates.
allow recovery self:process setfscreate;
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