[v1,0/5] ima: support fs-verity signatures stored as

Message

Mimi Zohar Dec. 2, 2021, 9:55 p.m. UTC

Support for fs-verity file digests in IMA was discussed from the beginning,
prior to fs-verity being upstreamed[1,2].  This patch set adds signature
verification support based on the fs-verity file digest.  Both the
file digest and the signature must be included in the IMA measurement list
in order to disambiguate the type of file digest.

[1] https://events19.linuxfoundation.org/wp-content/uploads/2017/11/fs-verify_Mike-Halcrow_Eric-Biggers.pdf
[2] Documentation/filesystems/fsverity.rst

Changelog v1:
- Updated both fsverity and IMA documentation.
- Addressed both Eric Bigger's and Lakshmi's comments.

Mimi Zohar (5):
  fs-verity: define a function to return the integrity protected file
    digest
  ima: define a new signature type named IMA_VERITY_DIGSIG
  ima: limit including fs-verity's file digest in measurement list
  ima: support fs-verity file digest based signatures
  fsverity: update the documentation

 Documentation/filesystems/fsverity.rst    | 22 ++++++----
 Documentation/security/IMA-templates.rst  |  9 +++-
 fs/verity/Kconfig                         |  1 +
 fs/verity/fsverity_private.h              |  7 ---
 fs/verity/measure.c                       | 49 +++++++++++++++++++++
 include/linux/fsverity.h                  | 18 ++++++++
 security/integrity/ima/ima.h              |  3 +-
 security/integrity/ima/ima_api.c          | 23 +++++++++-
 security/integrity/ima/ima_appraise.c     | 52 ++++++++++++++++++++++-
 security/integrity/ima/ima_main.c         |  7 ++-
 security/integrity/ima/ima_template_lib.c |  3 +-
 security/integrity/integrity.h            |  1 +
 12 files changed, 172 insertions(+), 23 deletions(-)