From: Roberto Sassu roberto.sassu@huawei.com

Integrity detection and protection has long been a desirable feature, to reach a large user base and mitigate the risk of flaws in the software and attacks.

However, while solutions exist, they struggle to reach the large user base, due to requiring higher than desired constraints on performance, flexibility and configurability, that only security conscious people are willing to accept.

This is where the new digest_cache LSM comes into play, it offers additional support for new and existing integrity solutions, to make them faster and easier to deploy.

The full documentation with the motivation and the solution details can be found in patch 14.

The IMA integration patch set will be introduced separately. Also a PoC based on the current version of IPE can be provided.

v3: - Rewrite documentation, and remove the installation instructions since they are now included in the README of digest-cache-tools - Add digest cache event notifier - Drop digest_cache_was_reset(), and send instead to asynchronous notifications - Fix digest_cache LSM Kconfig style issues (suggested by Randy Dunlap) - Propagate digest cache reset to directory entries - Destroy per directory entry mutex - Introduce RESET_USER bit, to clear the dig_user pointer on set/removexattr - Replace 'file content' with 'file data' (suggested by Mimi) - Introduce per digest cache mutex and replace verif_data_lock spinlock - Track changes of security.digest_list xattr - Stop tracking file_open and use file_release instead also for file writes - Add error messages in digest_cache_create() - Load/unload testing kernel module automatically during execution of test - Add tests for digest cache event notifier - Add test for ftruncate() - Remove DIGEST_CACHE_RESET_PREFETCH_BUF command in test and clear the buffer on read instead

v2: - Include the TLV parser in this patch set (from user asymmetric keys and signatures) - Move from IMA and make an independent LSM - Remove IMA-specific stuff from this patch set - Add per algorithm hash table - Expect all digest lists to be in the same directory and allow changing the default directory - Support digest lookup on directories, when there is no security.digest_list xattr - Add seq num to digest list file name, to impose ordering on directory iteration - Add a new data type DIGEST_LIST_ENTRY_DATA for the nested data in the tlv digest list format - Add the concept of verification data attached to digest caches - Add the reset mechanism to track changes on digest lists and directory containing the digest lists - Add kernel selftests

v1: - Add documentation in Documentation/security/integrity-digest-cache.rst - Pass the mask of IMA actions to digest_cache_alloc() - Add a reference count to the digest cache - Remove the path parameter from digest_cache_get(), and rely on the reference count to avoid the digest cache disappearing while being used - Rename the dentry_to_check parameter of digest_cache_get() to dentry - Rename digest_cache_get() to digest_cache_new() and add digest_cache_get() to set the digest cache in the iint of the inode for which the digest cache was requested - Add dig_owner and dig_user to the iint, to distinguish from which inode the digest cache was created from, and which is using it; consequently it makes the digest cache usable to measure/appraise other digest caches (support not yet enabled) - Add dig_owner_mutex and dig_user_mutex to serialize accesses to dig_owner and dig_user until they are initialized - Enforce strong synchronization and make the contenders wait until dig_owner and dig_user are assigned to the iint the first time - Move checking IMA actions on the digest list earlier, and fail if no action were performed (digest cache not usable) - Remove digest_cache_put(), not needed anymore with the introduction of the reference count - Fail immediately in digest_cache_lookup() if the digest algorithm is not set in the digest cache - Use 64 bit mask for IMA actions on the digest list instead of 8 bit - Return NULL in the inline version of digest_cache_get() - Use list_add_tail() instead of list_add() in the iterator - Copy the digest list path to a separate buffer in digest_cache_iter_dir() - Use digest list parsers verified with Frama-C - Explicitly disable (for now) the possibility in the IMA policy to use the digest cache to measure/appraise other digest lists - Replace exit(<value>) with return <value> in manage_digest_lists.c

Roberto Sassu (14): lib: Add TLV parser security: Introduce the digest_cache LSM digest_cache: Add securityfs interface digest_cache: Add hash tables and operations digest_cache: Populate the digest cache from a digest list digest_cache: Parse tlv digest lists digest_cache: Parse rpm digest lists digest_cache: Add management of verification data digest_cache: Add support for directories digest cache: Prefetch digest lists if requested digest_cache: Reset digest cache on file/directory change digest_cache: Notify digest cache events selftests/digest_cache: Add selftests for digest_cache LSM docs: Add documentation of the digest_cache LSM

Documentation/security/digest_cache.rst | 763 ++++++++++++++++ Documentation/security/index.rst | 1 + MAINTAINERS | 16 + include/linux/digest_cache.h | 117 +++ include/linux/kernel_read_file.h | 1 + include/linux/tlv_parser.h | 28 + include/uapi/linux/lsm.h | 1 + include/uapi/linux/tlv_digest_list.h | 72 ++ include/uapi/linux/tlv_parser.h | 59 ++ include/uapi/linux/xattr.h | 6 + lib/Kconfig | 3 + lib/Makefile | 3 + lib/tlv_parser.c | 214 +++++ lib/tlv_parser.h | 17 + security/Kconfig | 11 +- security/Makefile | 1 + security/digest_cache/Kconfig | 33 + security/digest_cache/Makefile | 11 + security/digest_cache/dir.c | 252 ++++++ security/digest_cache/htable.c | 268 ++++++ security/digest_cache/internal.h | 290 +++++++ security/digest_cache/main.c | 570 ++++++++++++ security/digest_cache/modsig.c | 66 ++ security/digest_cache/notifier.c | 135 +++ security/digest_cache/parsers/parsers.h | 15 + security/digest_cache/parsers/rpm.c | 223 +++++ security/digest_cache/parsers/tlv.c | 299 +++++++ security/digest_cache/populate.c | 163 ++++ security/digest_cache/reset.c | 235 +++++ security/digest_cache/secfs.c | 87 ++ security/digest_cache/verif.c | 119 +++ security/security.c | 3 +- tools/testing/selftests/Makefile | 1 + .../testing/selftests/digest_cache/.gitignore | 3 + tools/testing/selftests/digest_cache/Makefile | 24 + .../testing/selftests/digest_cache/all_test.c | 815 ++++++++++++++++++ tools/testing/selftests/digest_cache/common.c | 78 ++ tools/testing/selftests/digest_cache/common.h | 135 +++ .../selftests/digest_cache/common_user.c | 47 + .../selftests/digest_cache/common_user.h | 17 + tools/testing/selftests/digest_cache/config | 1 + .../selftests/digest_cache/generators.c | 248 ++++++ .../selftests/digest_cache/generators.h | 19 + .../selftests/digest_cache/testmod/Makefile | 16 + .../selftests/digest_cache/testmod/kern.c | 564 ++++++++++++ .../selftests/lsm/lsm_list_modules_test.c | 3 + 46 files changed, 6047 insertions(+), 6 deletions(-) create mode 100644 Documentation/security/digest_cache.rst create mode 100644 include/linux/digest_cache.h create mode 100644 include/linux/tlv_parser.h create mode 100644 include/uapi/linux/tlv_digest_list.h create mode 100644 include/uapi/linux/tlv_parser.h create mode 100644 lib/tlv_parser.c create mode 100644 lib/tlv_parser.h create mode 100644 security/digest_cache/Kconfig create mode 100644 security/digest_cache/Makefile create mode 100644 security/digest_cache/dir.c create mode 100644 security/digest_cache/htable.c create mode 100644 security/digest_cache/internal.h create mode 100644 security/digest_cache/main.c create mode 100644 security/digest_cache/modsig.c create mode 100644 security/digest_cache/notifier.c create mode 100644 security/digest_cache/parsers/parsers.h create mode 100644 security/digest_cache/parsers/rpm.c create mode 100644 security/digest_cache/parsers/tlv.c create mode 100644 security/digest_cache/populate.c create mode 100644 security/digest_cache/reset.c create mode 100644 security/digest_cache/secfs.c create mode 100644 security/digest_cache/verif.c create mode 100644 tools/testing/selftests/digest_cache/.gitignore create mode 100644 tools/testing/selftests/digest_cache/Makefile create mode 100644 tools/testing/selftests/digest_cache/all_test.c create mode 100644 tools/testing/selftests/digest_cache/common.c create mode 100644 tools/testing/selftests/digest_cache/common.h create mode 100644 tools/testing/selftests/digest_cache/common_user.c create mode 100644 tools/testing/selftests/digest_cache/common_user.h create mode 100644 tools/testing/selftests/digest_cache/config create mode 100644 tools/testing/selftests/digest_cache/generators.c create mode 100644 tools/testing/selftests/digest_cache/generators.h create mode 100644 tools/testing/selftests/digest_cache/testmod/Makefile create mode 100644 tools/testing/selftests/digest_cache/testmod/kern.c