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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)
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Declare the domain unconditionally so we can always reference it
# in neverallow rules.
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
type recovery, domain;
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# But the allow rules are only included in the recovery policy.
# Otherwise recovery is only allowed the domain rules.
recovery_only(`
allow recovery rootfs:file entrypoint;
recovery: enable permissive_or_unconfined Switch from using unconfined_domain() to permissive_or_unconfined(). For user builds, or builds with FORCE_PERMISSIVE_TO_UNCONFINED=true, this is a no-op. For userdebug / eng builds, this will allow us to collect denials from /proc/last_kmsg. Change-Id: I41e1a206b2a3b0eee34539bfebfc5deee9e18a42
2014-05-31 17:07:39 +02:00
permissive_or_unconfined(recovery)
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Set security contexts on files that are not known to the loaded policy.
allow recovery self:capability2 mac_admin;
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
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Mount filesystems.
allow recovery fs_type:filesystem *;
allow recovery unlabeled: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
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Create and relabel files under /system.
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 };
Clean up kernel, init, and recovery domains. Narrow the relabelto rules to a more specific type set for each domain. Drop mount permissions from the kernel domain since mounting occurs after switching to the init domain. This was likely a residual of when all processes were left in the kernel domain on a recovery boot due to the missing setcon statement in the recovery init.rc. Be consistent with unlabeled filesystems (i.e. filesystems without any matching fs_use or genfs_contexts entry) so that we can also unmount them. Add comments to note the reason for various rules. Change-Id: I269a1744ed7bf8c6be899494c5dc97847e5a994d Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 20:35:55 +02:00
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Required to e.g. wipe userdata/cache.
allow recovery dev_type:blk_file rw_file_perms;
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
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# GUI
allow recovery self:process execmem;
allow recovery ashmem_device:chr_file execute;
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
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Execute /tmp/update_binary.
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
Create a separate recovery policy. Create a separate recovery policy and only include the recovery domain allow rules in it. Change-Id: I444107f9821eabf4164ba07a44d03bd71e719989 Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2014-05-29 22:40:15 +02:00
# Use setfscreatecon() to label files for OTA updates.
allow recovery self:process setfscreate;
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