[PATCH v2 0/6] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

Tue Jun 22 12:37:46 UTC 2021

The first three patches are new and are applicable regardless of this
series, but the rest won't apply cleanly without them. I chose to
include them this time, but I can split them up for v3 if that's
preferred.

v1 -> v2:
 - Added new commit to make trusted key Kconfig option independent
   of TPM and added new Kconfig file and symbols for trusted keys
 - Add new commit for importing existing key material (Jan)
 - Allow users to force use of kernel RNG (Jarkko)
 - Enforce maximum keymod size (Horia)
 - Use append_seq_(in|out)_ptr_intlen instead of append_seq_(in|out)_ptr
   (Horia)
 - Make blobifier handle private to CAAM glue code file (Horia)
 - Extend trusted keys documentation for CAAM
 - Rebased on v5.12-rc7 and updated cover letter:

The Cryptographic Acceleration and Assurance Module (CAAM) is an IP core
built into many newer i.MX and QorIQ SoCs by NXP.

Its blob mechanism can AES encrypt/decrypt user data using a unique
never-disclosed device-specific key.

There has been multiple discussions on how to represent this within the kernel:

The Cryptographic Acceleration and Assurance Module (CAAM) is an IP core
built into many newer i.MX and QorIQ SoCs by NXP.

Its blob mechanism can AES encrypt/decrypt user data using a unique
never-disclosed device-specific key. There has been multiple
discussions on how to represent this within the kernel:

 - [RFC] crypto: caam - add red blobifier
   Steffen implemented[1] a PoC sysfs driver to start a discussion on how to
   best integrate the blob mechanism.
   Mimi suggested that it could be used to implement trusted keys.
   Trusted keys back then were a TPM-only feature.

 - security/keys/secure_key: Adds the secure key support based on CAAM.
   Udit added[2] a new "secure" key type with the CAAM as backend. The key
   material stays within the kernel only.
   Mimi and James agreed that this needs a generic interface, not specific
   to CAAM. Mimi suggested trusted keys. Jan noted that this could serve as
   basis for TEE-backed keys.

 - [RFC] drivers: crypto: caam: key: Add caam_tk key type
   Franck added[3] a new "caam_tk" key type based on Udit's work. This time
   it uses CAAM "black blobs" instead of "red blobs", so key material stays
   within the CAAM and isn't exposed to kernel in plaintext.
   James voiced the opinion that there should be just one user-facing generic
   wrap/unwrap key type with multiple possible handlers.
   David suggested trusted keys.

 - Introduce TEE based Trusted Keys support
   Sumit reworked[4] trusted keys to support multiple possible backends with
   one chosen at boot time and added a new TEE backend along with TPM.
   This now sits in Jarkko's master branch to be sent out for v5.13

This patch series builds on top of Sumit's rework to have the CAAM as yet another
trusted key backend.

The CAAM bits are based on Steffen's initial patch from 2015. His work had been
used in the field for some years now, so I preferred not to deviate too much from it.

This series has been tested with dmcrypt[5] on an i.MX6DL.

Looking forward to your feedback.

Cheers,
Ahmad

 [1]: https://lore.kernel.org/linux-crypto/1447082306-19946-2-git-send-email-s.trumtrar@pengutronix.de/
 [2]: https://lore.kernel.org/linux-integrity/20180723111432.26830-1-udit.agarwal@nxp.com/
 [3]: https://lore.kernel.org/lkml/1551456599-10603-2-git-send-email-franck.lenormand@nxp.com/
 [4]: https://lore.kernel.org/lkml/1604419306-26105-1-git-send-email-sumit.garg@linaro.org/
 [5]: https://lore.kernel.org/linux-integrity/20210122084321.24012-2-a.fatoum@pengutronix.de/

---
To: Jarkko Sakkinen <jarkko at kernel.org>
To: "Horia Geantă" <horia.geanta at nxp.com>
To: Mimi Zohar <zohar at linux.ibm.com>
To: Aymen Sghaier <aymen.sghaier at nxp.com>
To: Herbert Xu <herbert at gondor.apana.org.au>
To: "David S. Miller" <davem at davemloft.net>
To: James Bottomley <jejb at linux.ibm.com>
Cc: David Howells <dhowells at redhat.com>
Cc: James Morris <jmorris at namei.org>
Cc: "Serge E. Hallyn" <serge at hallyn.com>
Cc: Steffen Trumtrar <s.trumtrar at pengutronix.de>
Cc: Udit Agarwal <udit.agarwal at nxp.com>
Cc: Jan Luebbe <j.luebbe at pengutronix.de>
Cc: David Gstir <david at sigma-star.at>
Cc: Eric Biggers <ebiggers at kernel.org>
Cc: Richard Weinberger <richard at nod.at>
Cc: Franck LENORMAND <franck.lenormand at nxp.com>
Cc: Sumit Garg <sumit.garg at linaro.org>
Cc: linux-integrity at vger.kernel.org
Cc: keyrings at vger.kernel.org
Cc: linux-crypto at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-security-module at vger.kernel.org

Ahmad Fatoum (6):
  KEYS: trusted: allow use of TEE as backend without TCG_TPM support
  KEYS: trusted: Allow import from existing key material for development
  KEYS: trusted: allow users to use kernel RNG for key material
  KEYS: trusted: allow trust sources to use kernel RNG for key material
  crypto: caam - add in-kernel interface for blob generator
  KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

 Documentation/admin-guide/kernel-parameters.txt   |   8 +-
 Documentation/security/keys/trusted-encrypted.rst |  74 ++++-
 drivers/crypto/caam/Kconfig                       |   3 +-
 drivers/crypto/caam/Makefile                      |   1 +-
 drivers/crypto/caam/blob_gen.c                    | 230 +++++++++++++++-
 include/keys/trusted-type.h                       |   2 +-
 include/keys/trusted_caam.h                       |  11 +-
 include/soc/fsl/caam-blob.h                       |  56 ++++-
 security/keys/Kconfig                             |  14 +-
 security/keys/trusted-keys/Kconfig                |  49 +++-
 security/keys/trusted-keys/Makefile               |  10 +-
 security/keys/trusted-keys/trusted_caam.c         |  74 +++++-
 security/keys/trusted-keys/trusted_core.c         |  48 ++-
 13 files changed, 554 insertions(+), 26 deletions(-)
 create mode 100644 drivers/crypto/caam/blob_gen.c
 create mode 100644 include/keys/trusted_caam.h
 create mode 100644 include/soc/fsl/caam-blob.h
 create mode 100644 security/keys/trusted-keys/Kconfig
 create mode 100644 security/keys/trusted-keys/trusted_caam.c

base-commit: 13311e74253fe64329390df80bed3f07314ddd61
-- 
git-series 0.9.1