[v8,0/8] TPM 2.0 trusted keys with attached policy

Message

James Bottomley March 10, 2020, 5:09 a.m. UTC

This is a respin to separate patch 4 into the original three patches
it was.  I've done testing with each of the three splinters, so I
think I've got the split correct.

General cover letter:

This patch updates the trusted key code to export keys in the ASN.1
format used by current TPM key tools (openssl_tpm2_engine and
openconnect).  It also simplifies the use of policy with keys because
the ASN.1 format is designed to carry a description of how to
construct the policy, with the result that simple policies (like
authorization and PCR locking) can now be constructed and used in the
kernel, bringing the TPM 2.0 policy use into line with how TPM 1.2
works.

The key format is designed to be compatible with our two openssl
engine implementations as well as with the format used by openconnect.
I've added seal/unseal to my engine so I can use it for
interoperability testing and I'll later use this for sealed symmetric
keys via engine:

https://git.kernel.org/pub/scm/linux/kernel/git/jejb/openssl_tpm2_engine.git/

James

---

James Bottomley (8):
  lib: add ASN.1 encoder
  oid_registry: Add TCG defined OIDS for TPM keys
  security: keys: trusted: fix TPM2 authorizations
  security: keys: trusted: use ASN.1 TPM2 key format for the blobs
  security: keys: trusted: Make sealed key properly interoperable
  security: keys: trusted: add PCR policy to TPM2 keys
  security: keys: trusted: add ability to specify arbitrary policy
  security: keys: trusted: implement counter/timer policy

 Documentation/security/keys/trusted-encrypted.rst |  64 ++-
 include/keys/trusted-type.h                       |   7 +-
 include/linux/asn1_encoder.h                      |  32 ++
 include/linux/oid_registry.h                      |   5 +
 include/linux/tpm.h                               |   8 +
 lib/Makefile                                      |   2 +-
 lib/asn1_encoder.c                                | 431 ++++++++++++++++++++
 security/keys/Kconfig                             |   2 +
 security/keys/trusted-keys/Makefile               |   2 +-
 security/keys/trusted-keys/tpm2-policy.c          | 463 ++++++++++++++++++++++
 security/keys/trusted-keys/tpm2-policy.h          |  31 ++
 security/keys/trusted-keys/tpm2key.asn1           |  23 ++
 security/keys/trusted-keys/trusted_tpm1.c         |  56 ++-
 security/keys/trusted-keys/trusted_tpm2.c         | 370 +++++++++++++++--
 14 files changed, 1459 insertions(+), 37 deletions(-)
 create mode 100644 include/linux/asn1_encoder.h
 create mode 100644 lib/asn1_encoder.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.c
 create mode 100644 security/keys/trusted-keys/tpm2-policy.h
 create mode 100644 security/keys/trusted-keys/tpm2key.asn1