Policy Generation:
Additional, per device, policy files can be added into the policy build.
They can be configured through the use of four variables, they are:
- BOARD_SEPOLICY_REPLACE
- BOARD_SEPOLICY_UNION
- BOARD_SEPOLICY_DIRS
- BOARD_SEPOLICY_IGNORE
The variables should be set in the BoardConfig.mk file in the device or vendor directories.
BOARD_SEPOLICY_UNION is a list of files that will be "unioned", IE concatenated, at the END of their respective file in external/sepolicy. Note, to add a unique file you would use this variable.
BOARD_SEPOLICY_REPLACE is a list of files that will be used instead of the corresponding file in external/sepolicy.
BOARD_SEPOLICY_DIRS contains a list of directories to search for BOARD_SEPOLICY_UNION and BOARD_SEPOLICY_REPLACE files. Order matters in this list. eg.) If you have BOARD_SEPOLICY_UNION += widget.te and have 2 instances of widget.te files on BOARD_SEPOLICY_DIRS search path. The first one found (at the first search dir containing the file) gets processed first. Reviewing out/target/product//etc/sepolicy_intermediates/policy.conf will help sort out ordering issues.
It is an error to specify a BOARD_POLICY_REPLACE file that does not exist in external/sepolicy.
It is an error to specify a BOARD_POLICY_REPLACE file that appears multiple times on the policy search path defined by BOARD_SEPOLICY_DIRS. eg.) if you specify shell.te in BOARD_SEPOLICY_REPLACE and BOARD_SEPOLICY_DIRS is set to "vendor/widget/common/sepolicy device/widget/x/sepolicy" and shell.te appears in both locations, it is an error. Unless it is in BOARD_SEPOLICY_IGNORE to be filtered out. See BOARD_SEPOLICY_IGNORE for more details.
It is an error to specify the same file name in both BOARD_POLICY_REPLACE and BOARD_POLICY_UNION.
It is an error to specify a BOARD_SEPOLICY_DIRS that has no entries when specifying BOARD_SEPOLICY_REPLACE.
It is an error to specify a BOARD_POLICY_UNION file that doesn't appear in any of the BOARD_SEPOLICY_DIRS locations.
BOARD_SEPOLICY_IGNORE is a list of paths (directory + filename) of files that are not to be included in the resulting policy. This list is passed to filter-out to remove any paths you may want to ignore. This is useful if you have numerous config directories that contain a file and you want to NOT include a particular file in your resulting policy file, either by UNION or REPLACE. Eg.) Suppose the following: BOARD_SEPOLICY_DIRS += X Y BOARD_SEPOLICY_REPLACE += A BOARD_SEPOLICY_IGNORE += X/A
Directories X and Y contain A.
The resulting policy is created by using Y/A only, thus X/A was
ignored.
Example BoardConfig.mk Usage: From the Tuna device BoardConfig.mk, device/samsung/tuna/BoardConfig.mk
BOARD_SEPOLICY_DIRS +=
device/samsung/tuna/sepolicy
BOARD_SEPOLICY_UNION +=
genfs_contexts
file_contexts
sepolicy.te
SPECIFIC POLICY FILE INFORMATION
mac_permissions.xml: ABOUT: The mac_permissions.xml file is used for controlling the mmac solutions as well as mapping a public base16 signing key with an arbitrary seinfo string. Details of the files contents can be found in a comment at the top of that file. The seinfo string, previously mentioned, is the same string that is referenced in seapp_contexts.
This file can be replaced through BOARD_SEPOLICY_REPLACE containing the
value "mac_permissions.xml", or appended to by using the BOARD_SEPOLICY_UNION
variable. It is important to note the final processed version of this file
is stripped of comments and whitespace. This is to preserve space on the
system.img. If one wishes to view it in a more human friendly format,
the "tidy" or "xmllint" command will assist you.
TOOLING: insertkeys.py Is a helper script for mapping arbitrary tags in the signature stanzas of mac_permissions.xml to public keys found in pem files. This script takes a mac_permissions.xml file(s) and configuration file in order to operate. Details of the configuration file (keys.conf) can be found in the subsection keys.conf. This tool is also responsible for stripping the comments and whitespace during processing.
keys.conf
The keys.conf file is used for controlling the mapping of "tags" found in
the mac_permissions.xml signature stanzas with actual public keys found in
pem files. The configuration file can be used in BOARD_SEPOLICY_UNION and
BOARD_SEPOLICY_REPLACE variables and is processed via m4.
The script allows for mapping any string contained in TARGET_BUILD_VARIANT
with specific path to a pem file. Typically TARGET_BUILD_VARIANT is either
user, eng or userdebug. Additionally, one can specify "ALL" to map a path to
any string specified in TARGET_BUILD_VARIANT. All tags are matched verbatim
and all options are matched lowercase. The options are "tolowered" automatically
for the user, it is convention to specify tags and options in all uppercase
and tags start with @. The option arguments can also use environment variables
via the familiar $VARIABLE syntax. This is often useful for setting a location
to ones release keys.
Often times, one will need to integrate an application that was signed by a separate
organization and may need to extract the pem file for the insertkeys/keys.conf tools.
Extraction of the public key in the pem format is possible via openssl. First you need
to unzip the apk, once it is unzipped, cd into the META_INF directory and then execute
openssl pkcs7 -inform DER -in CERT.RSA -out CERT.pem -outform PEM -print_certs
On some occasions CERT.RSA has a different name, and you will need to adjust for that.
After extracting the pem, you can rename it, and configure keys.conf and
mac_permissions.xml to pick up the change. You MUST open the generated pem file in a text
editor and strip out anything outside the opening and closing scissor lines. Failure to do
so WILL cause a compile time issue thrown by insertkeys.py
NOTE: The pem files are base64 encoded and PackageManagerService, mac_permissions.xml
and setool all use base16 encodings.