952673da5b
This is used for mapper sphal library which is defined in VINTF and queried via servicemanager. Bug: 317178925 Test: cuttlefish loads mapper.minigbm Change-Id: Ibddc0239e52065a89c656f885f34835406665009
406 lines
17 KiB
Python
406 lines
17 KiB
Python
# Copyright 2021 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from optparse import OptionParser
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from optparse import Option, OptionValueError
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import os
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import pkgutil
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import policy
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import re
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import shutil
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import sys
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import tempfile
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SHARED_LIB_EXTENSION = '.dylib' if sys.platform == 'darwin' else '.so'
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#############################################################
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# Tests
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#############################################################
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def TestDataTypeViolations(pol):
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return pol.AssertPathTypesHaveAttr(["/data/"], [], "data_file_type")
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def TestSystemTypeViolations(pol):
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partitions = ["/system/", "/system_ext/", "/product/"]
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exceptions = [
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# devices before treble don't have a vendor partition
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"/system/vendor/",
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# overlay files are mounted over vendor
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"/product/overlay/",
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"/product/vendor_overlay/",
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"/system/overlay/",
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"/system/product/overlay/",
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"/system/product/vendor_overlay/",
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"/system/system_ext/overlay/",
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"/system_ext/overlay/",
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]
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return pol.AssertPathTypesHaveAttr(partitions, exceptions, "system_file_type")
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def TestBpffsTypeViolations(pol):
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return pol.AssertGenfsFilesystemTypesHaveAttr("bpf", "bpffs_type")
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def TestProcTypeViolations(pol):
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return pol.AssertGenfsFilesystemTypesHaveAttr("proc", "proc_type")
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def TestSysfsTypeViolations(pol):
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ret = pol.AssertGenfsFilesystemTypesHaveAttr("sysfs", "sysfs_type")
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ret += pol.AssertPathTypesHaveAttr(["/sys/"], ["/sys/kernel/debug/",
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"/sys/kernel/tracing"], "sysfs_type")
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return ret
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def TestDebugfsTypeViolations(pol):
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ret = pol.AssertGenfsFilesystemTypesHaveAttr("debugfs", "debugfs_type")
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ret += pol.AssertPathTypesHaveAttr(["/sys/kernel/debug/",
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"/sys/kernel/tracing"], [], "debugfs_type")
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return ret
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def TestTracefsTypeViolations(pol):
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ret = pol.AssertGenfsFilesystemTypesHaveAttr("tracefs", "tracefs_type")
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ret += pol.AssertPathTypesHaveAttr(["/sys/kernel/tracing"], [], "tracefs_type")
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ret += pol.AssertPathTypesDoNotHaveAttr(["/sys/kernel/debug"],
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["/sys/kernel/debug/tracing"], "tracefs_type",
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[])
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return ret
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def TestVendorTypeViolations(pol):
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partitions = ["/vendor/", "/odm/"]
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exceptions = [
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"/vendor/etc/selinux/",
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"/vendor/odm/etc/selinux/",
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"/odm/etc/selinux/",
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]
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return pol.AssertPathTypesHaveAttr(partitions, exceptions, "vendor_file_type")
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def TestCoreDataTypeViolations(pol):
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ret = pol.AssertPathTypesHaveAttr(["/data/"], ["/data/vendor",
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"/data/vendor_ce", "/data/vendor_de"], "core_data_file_type")
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ret += pol.AssertPathTypesDoNotHaveAttr(["/data/vendor/", "/data/vendor_ce/",
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"/data/vendor_de/"], [], "core_data_file_type")
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return ret
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def TestPropertyTypeViolations(pol):
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return pol.AssertPropertyOwnersAreExclusive()
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def TestAppDataTypeViolations(pol):
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# Types with the app_data_file_type should only be used for app data files
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# (/data/data/package.name etc) via seapp_contexts, and never applied
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# explicitly to other files.
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partitions = [
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"/data/",
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"/vendor/",
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"/odm/",
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"/product/",
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]
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exceptions = [
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# These are used for app data files for the corresponding user and
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# assorted other files.
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# TODO(b/172812577): Use different types for the different purposes
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"shell_data_file",
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"bluetooth_data_file",
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"nfc_data_file",
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"radio_data_file",
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]
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return pol.AssertPathTypesDoNotHaveAttr(partitions, [], "app_data_file_type",
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exceptions)
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def TestDmaHeapDevTypeViolations(pol):
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return pol.AssertPathTypesHaveAttr(["/dev/dma_heap/"], [],
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"dmabuf_heap_device_type")
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def TestCoredomainViolations(test_policy):
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# verify that all domains launched from /system have the coredomain
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# attribute
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ret = ""
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for d in test_policy.alldomains:
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domain = test_policy.alldomains[d]
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if domain.fromSystem and domain.fromVendor:
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ret += "The following domain is system and vendor: " + d + "\n"
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for domain in test_policy.alldomains.values():
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ret += domain.error
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violators = []
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for d in test_policy.alldomains:
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domain = test_policy.alldomains[d]
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if domain.fromSystem and "coredomain" not in domain.attributes:
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violators.append(d);
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if len(violators) > 0:
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ret += "The following domain(s) must be associated with the "
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ret += "\"coredomain\" attribute because they are executed off of "
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ret += "/system:\n"
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ret += " ".join(str(x) for x in sorted(violators)) + "\n"
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# verify that all domains launched form /vendor do not have the coredomain
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# attribute
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violators = []
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for d in test_policy.alldomains:
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domain = test_policy.alldomains[d]
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if domain.fromVendor and "coredomain" in domain.attributes:
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violators.append(d)
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if len(violators) > 0:
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ret += "The following domains must not be associated with the "
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ret += "\"coredomain\" attribute because they are executed off of "
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ret += "/vendor or /system/vendor:\n"
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ret += " ".join(str(x) for x in sorted(violators)) + "\n"
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return ret
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def TestViolatorAttribute(test_policy, attribute):
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# TODO(b/113124961): re-enable once all violator attributes are removed.
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return ""
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# ret = ""
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# return ret
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# violators = test_policy.DomainsWithAttribute(attribute)
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# if len(violators) > 0:
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# ret += "SELinux: The following domains violate the Treble ban "
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# ret += "against use of the " + attribute + " attribute: "
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# ret += " ".join(str(x) for x in sorted(violators)) + "\n"
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# return ret
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def TestViolatorAttributes(test_policy):
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ret = ""
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ret += TestViolatorAttribute(test_policy, "socket_between_core_and_vendor_violators")
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ret += TestViolatorAttribute(test_policy, "vendor_executes_system_violators")
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return ret
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def TestIsolatedAttributeConsistency(test_policy):
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permissionAllowList = {
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# access given from technical_debt.cil
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"codec2_config_prop" : ["file"],
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"device_config_nnapi_native_prop":["file"],
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"hal_allocator_default":["binder", "fd"],
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"hal_codec2": ["binder", "fd"],
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"hal_codec2_hwservice":["hwservice_manager"],
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"hal_graphics_allocator": ["binder", "fd"],
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"hal_graphics_allocator_service":["service_manager"],
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"hal_graphics_allocator_hwservice":["hwservice_manager"],
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"hal_graphics_allocator_server":["binder", "service_manager"],
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"hal_graphics_mapper_hwservice":["hwservice_manager"],
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"hal_graphics_mapper_service":["service_manager"],
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"hal_neuralnetworks": ["binder", "fd"],
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"hal_neuralnetworks_service": ["service_manager"],
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"hal_neuralnetworks_hwservice":["hwservice_manager"],
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"hal_omx_hwservice":["hwservice_manager"],
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"hidl_allocator_hwservice":["hwservice_manager"],
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"hidl_manager_hwservice":["hwservice_manager"],
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"hidl_memory_hwservice":["hwservice_manager"],
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"hidl_token_hwservice":["hwservice_manager"],
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"hwservicemanager":["binder"],
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"hwservicemanager_prop":["file"],
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"mediacodec":["binder", "fd"],
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"mediaswcodec":["binder", "fd"],
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"media_variant_prop":["file"],
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"nnapi_ext_deny_product_prop":["file"],
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"servicemanager":["fd"],
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"toolbox_exec": ["file"],
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# extra types being granted to isolated_compute_app
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"isolated_compute_allowed":["service_manager", "chr_file"],
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}
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def resolveHalServerSubtype(target):
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# permission given as a client in technical_debt.cil
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hal_server_attributes = [
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"hal_codec2_server",
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"hal_graphics_allocator_server",
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"hal_neuralnetworks_server"]
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for attr in hal_server_attributes:
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if target in test_policy.pol.QueryTypeAttribute(Type=attr, IsAttr=True):
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return attr.rsplit("_", 1)[0]
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return target
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def checkIsolatedComputeAllowed(tctx, tclass):
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# check if the permission is in isolated_compute_allowed
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allowedMemberTypes = test_policy.pol.QueryTypeAttribute(Type="isolated_compute_allowed_service", IsAttr=True) \
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.union(test_policy.pol.QueryTypeAttribute(Type="isolated_compute_allowed_device", IsAttr=True))
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return tctx in allowedMemberTypes and tclass in permissionAllowList["isolated_compute_allowed"]
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def checkPermissions(permissions):
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violated_permissions = []
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for perm in permissions:
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tctx, tclass, p = perm.split(":")
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tctx = resolveHalServerSubtype(tctx)
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# check unwanted permissions
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if not checkIsolatedComputeAllowed(tctx, tclass) and \
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( tctx not in permissionAllowList \
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or tclass not in permissionAllowList[tctx] \
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or ( p == "write") \
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or ( p == "rw_file_perms") ):
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violated_permissions += [perm]
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return violated_permissions
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ret = ""
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isolatedMemberTypes = test_policy.pol.QueryTypeAttribute(Type="isolated_app_all", IsAttr=True)
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baseRules = test_policy.pol.QueryExpandedTERule(scontext=["isolated_app"])
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basePermissionSet = set([":".join([rule.tctx, rule.tclass, perm])
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for rule in baseRules for perm in rule.perms])
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for subType in isolatedMemberTypes:
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if subType == "isolated_app" : continue
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currentTypeRule = test_policy.pol.QueryExpandedTERule(scontext=[subType])
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typePermissionSet = set([":".join([rule.tctx, rule.tclass, perm])
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for rule in currentTypeRule for perm in rule.perms
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if not rule.tctx in [subType, subType + "_userfaultfd"]])
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deltaPermissionSet = typePermissionSet.difference(basePermissionSet)
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violated_permissions = checkPermissions(list(deltaPermissionSet))
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for perm in violated_permissions:
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ret += "allow %s %s:%s %s \n" % (subType, *perm.split(":"))
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if ret:
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ret = ("Found prohibited permission granted for isolated like types. " + \
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"Please replace your allow statements that involve \"-isolated_app\" with " + \
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"\"-isolated_app_all\". Violations are shown as the following: \n") + ret
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return ret
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def TestDevTypeViolations(pol):
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exceptions = [
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"/dev/socket",
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]
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exceptionTypes = [
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"boringssl_self_test_marker", # /dev/boringssl/selftest
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"cgroup_rc_file", # /dev/cgroup.rc
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"dev_cpu_variant", # /dev/cpu_variant:{arch}
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"fscklogs", # /dev/fscklogs
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"properties_serial", # /dev/__properties__/properties_serial
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"property_info", # /dev/__properties__/property_info
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"runtime_event_log_tags_file", # /dev/event-log-tags
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]
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return pol.AssertPathTypesHaveAttr(["/dev"], exceptions,
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"dev_type", exceptionTypes)
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###
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# extend OptionParser to allow the same option flag to be used multiple times.
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# This is used to allow multiple file_contexts files and tests to be
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# specified.
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#
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class MultipleOption(Option):
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ACTIONS = Option.ACTIONS + ("extend",)
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STORE_ACTIONS = Option.STORE_ACTIONS + ("extend",)
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TYPED_ACTIONS = Option.TYPED_ACTIONS + ("extend",)
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ALWAYS_TYPED_ACTIONS = Option.ALWAYS_TYPED_ACTIONS + ("extend",)
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def take_action(self, action, dest, opt, value, values, parser):
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if action == "extend":
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values.ensure_value(dest, []).append(value)
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else:
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Option.take_action(self, action, dest, opt, value, values, parser)
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Tests = [
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"TestBpffsTypeViolations",
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"TestDataTypeViolators",
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"TestProcTypeViolations",
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"TestSysfsTypeViolations",
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"TestSystemTypeViolators",
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"TestDebugfsTypeViolations",
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"TestTracefsTypeViolations",
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"TestVendorTypeViolations",
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"TestCoreDataTypeViolations",
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"TestPropertyTypeViolations",
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"TestAppDataTypeViolations",
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"TestDmaHeapDevTypeViolations",
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"TestCoredomainViolations",
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"TestViolatorAttributes",
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"TestIsolatedAttributeConsistency",
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"TestDevTypeViolations",
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]
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def do_main(libpath):
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"""
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Args:
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libpath: string, path to libsepolwrap.so
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"""
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usage = "sepolicy_tests -f vendor_file_contexts -f "
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usage +="plat_file_contexts -p policy [--test test] [--help]"
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parser = OptionParser(option_class=MultipleOption, usage=usage)
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parser.add_option("-f", "--file_contexts", dest="file_contexts",
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metavar="FILE", action="extend", type="string")
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parser.add_option("-p", "--policy", dest="policy", metavar="FILE")
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parser.add_option("-t", "--test", dest="test", action="extend",
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help="Test options include "+str(Tests))
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(options, args) = parser.parse_args()
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if not options.policy:
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sys.exit("Must specify monolithic policy file\n" + parser.usage)
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if not os.path.exists(options.policy):
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sys.exit("Error: policy file " + options.policy + " does not exist\n"
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+ parser.usage)
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if not options.file_contexts:
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sys.exit("Error: Must specify file_contexts file(s)\n" + parser.usage)
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for f in options.file_contexts:
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if not os.path.exists(f):
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sys.exit("Error: File_contexts file " + f + " does not exist\n" +
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parser.usage)
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pol = policy.Policy(options.policy, options.file_contexts, libpath)
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test_policy = policy.TestPolicy()
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test_policy.setup(pol)
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results = ""
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# If an individual test is not specified, run all tests.
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if options.test is None or "TestBpffsTypeViolations" in options.test:
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results += TestBpffsTypeViolations(pol)
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if options.test is None or "TestDataTypeViolations" in options.test:
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results += TestDataTypeViolations(pol)
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if options.test is None or "TestProcTypeViolations" in options.test:
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results += TestProcTypeViolations(pol)
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if options.test is None or "TestSysfsTypeViolations" in options.test:
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results += TestSysfsTypeViolations(pol)
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if options.test is None or "TestSystemTypeViolations" in options.test:
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results += TestSystemTypeViolations(pol)
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if options.test is None or "TestDebugfsTypeViolations" in options.test:
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results += TestDebugfsTypeViolations(pol)
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if options.test is None or "TestTracefsTypeViolations" in options.test:
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results += TestTracefsTypeViolations(pol)
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if options.test is None or "TestVendorTypeViolations" in options.test:
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results += TestVendorTypeViolations(pol)
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if options.test is None or "TestCoreDataTypeViolations" in options.test:
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results += TestCoreDataTypeViolations(pol)
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if options.test is None or "TestPropertyTypeViolations" in options.test:
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results += TestPropertyTypeViolations(pol)
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if options.test is None or "TestAppDataTypeViolations" in options.test:
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results += TestAppDataTypeViolations(pol)
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if options.test is None or "TestDmaHeapDevTypeViolations" in options.test:
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results += TestDmaHeapDevTypeViolations(pol)
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if options.test is None or "TestCoredomainViolations" in options.test:
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results += TestCoredomainViolations(test_policy)
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if options.test is None or "TestViolatorAttributes" in options.test:
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results += TestViolatorAttributes(test_policy)
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if options.test is None or "TestIsolatedAttributeConsistency" in options.test:
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results += TestIsolatedAttributeConsistency(test_policy)
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# dev type test won't be run as default
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if options.test and "TestDevTypeViolations" in options.test:
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results += TestDevTypeViolations(pol)
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if len(results) > 0:
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sys.exit(results)
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if __name__ == '__main__':
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temp_dir = tempfile.mkdtemp()
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try:
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libname = "libsepolwrap" + SHARED_LIB_EXTENSION
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libpath = os.path.join(temp_dir, libname)
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with open(libpath, "wb") as f:
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blob = pkgutil.get_data("sepolicy_tests", libname)
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if not blob:
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sys.exit("Error: libsepolwrap does not exist. Is this binary corrupted?\n")
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f.write(blob)
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do_main(libpath)
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finally:
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shutil.rmtree(temp_dir)
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