Support for including fs-verity file digests and signatures in the IMA measurement list as well as verifying the fs-verity file digest based signatures, all based on IMA policy rules, was discussed from the beginning, prior to fs-verity being upstreamed[1,2]. Support including fs-verity file digests in the 'd-ng' template field based on a new policy rule option named 'digest_type=hash|verity'. Also support verifying fs-verity file digest based signatures based on policy. A new template field named 'd-type' as well as a new template named 'ima-ngv2' are defined to differentiate betweeen file hashes and fs-verity file digests, when file signatures are not included in the IMA measurement list. [1] https://events19.linuxfoundation.org/wp-content/uploads/2017/11/fs-verify_Mike-Halcrow_Eric-Biggers.pdf [2] Documentation/filesystems/fsverity.rst Changelog v2: - Addressed Eric Bigger's comments: sign the hash of fsverity's digest and the digest's metadata, use match_string, use preferred function name fsverity_get_digest(), support including unsigned fs-verity's digests in the IMA measurement list. - Remove signatures requirement for including fs-verity's file digests in the 'd-ng' field of the measurement list. Changelog v1: - Updated both fsverity and IMA documentation. - Addressed both Eric Bigger's and Lakshmi's comments. Mimi Zohar (6): ima: rename IMA_ACTION_FLAGS to IMA_NONACTION_FLAGS fs-verity: define a function to return the integrity protected file digest ima: define a new template field 'd-type' and a new template 'ima-ngv2' ima: include fsverity's file digests in the IMA measurement list ima: support fs-verity file digest based signatures fsverity: update the documentation Documentation/ABI/testing/ima_policy | 17 +++++ Documentation/filesystems/fsverity.rst | 22 +++--- Documentation/security/IMA-templates.rst | 10 ++- fs/verity/Kconfig | 1 + fs/verity/fsverity_private.h | 7 -- fs/verity/measure.c | 40 +++++++++++ include/linux/fsverity.h | 18 +++++ include/uapi/linux/ima.h | 26 ++++++++ security/integrity/ima/ima_api.c | 29 +++++++- security/integrity/ima/ima_appraise.c | 81 +++++++++++++++++++++++ security/integrity/ima/ima_main.c | 2 +- security/integrity/ima/ima_policy.c | 40 ++++++++++- security/integrity/ima/ima_template.c | 3 + security/integrity/ima/ima_template_lib.c | 23 ++++++- security/integrity/ima/ima_template_lib.h | 2 + security/integrity/integrity.h | 7 +- 16 files changed, 302 insertions(+), 26 deletions(-) create mode 100644 include/uapi/linux/ima.h -- 2.27.0
