[PATCHv2 00/13] nvme: implement secure concatenation

[hare@kernel.org]

From: Hannes Reinecke <hare@suse.de>

Hi all,

here's my attempt to implement secure concatenation for NVMe-of TCP
as outlined in TP8018.
Secure concatenation means that a TLS PSK is generated from the key
material negotiated by the DH-HMAC-CHAP protocol, and the TLS PSK
is then used for a subsequent TLS connection.
The difference between the original definition of secure concatenation
and the method outlined in TP8018 is that with TP8018 the connection
is reset after DH-HMAC-CHAP negotiation, and a new connection is setup
with the generated TLS PSK.

To implement that I have decided on resetting the connection from the
nvme-tcp driver after the initial connection has been set up.
Another way would have been to offload the connection reset to userspace,
and let nvme-cli reset the connection. But that would be a modification
to the userspace interface, and hence I didn't go that way.
The drawback with this approach is that we'll create all I/O queues
before resetting for TLS, even though these queues should never be used.
But fixing that requires a larger rewrite of the TCP driver to unify the
setup and reconnect paths. So keep it that way for now.

As usual, comments and reviews are welcome.

Changes to the original submission:
- Sanitize TLS key handling
- Fixup modconfig compilation

Hannes Reinecke (13):
  crypto,fs: Separate out hkdf_extract() and hkdf_expand()
  nvme: add nvme_auth_generate_psk()
  nvme: add nvme_auth_generate_digest()
  nvme: add nvme_auth_derive_tls_psk()
  nvme-keyring: add nvme_tls_psk_refresh()
  nvme-keyring: restrict match length for version '1' identifiers
  nvme-tcp: check for invalidated or revoked key
  nvme-fabrics: authentication errors are not retryable
  nvme-tcp: sanitize TLS key handling
  nvme-tcp: request secure channel concatenation
  nvme-tcp: combine reset and recovery
  nvme-tcp: reset after recovery for secure concatenation
  nvmet-tcp: support secure channel concatenation

 crypto/Makefile                        |   1 +
 crypto/hkdf.c                          | 111 +++++++++++
 drivers/nvme/common/auth.c             | 252 +++++++++++++++++++++++++
 drivers/nvme/common/keyring.c          |  71 +++++++
 drivers/nvme/host/auth.c               | 108 ++++++++++-
 drivers/nvme/host/core.c               |   1 -
 drivers/nvme/host/fabrics.c            |  46 ++++-
 drivers/nvme/host/fabrics.h            |   3 +
 drivers/nvme/host/nvme.h               |   1 -
 drivers/nvme/host/sysfs.c              |   9 +-
 drivers/nvme/host/tcp.c                | 106 ++++++++---
 drivers/nvme/target/auth.c             |  73 ++++++-
 drivers/nvme/target/fabrics-cmd-auth.c |  46 ++++-
 drivers/nvme/target/fabrics-cmd.c      |  30 ++-
 drivers/nvme/target/nvmet.h            |  30 ++-
 drivers/nvme/target/tcp.c              |  27 +++
 fs/crypto/hkdf.c                       |  68 +------
 include/crypto/hkdf.h                  |  18 ++
 include/linux/nvme-auth.h              |   5 +
 include/linux/nvme-keyring.h           |   7 +
 include/linux/nvme.h                   |   7 +
 21 files changed, 898 insertions(+), 122 deletions(-)
 create mode 100644 crypto/hkdf.c
 create mode 100644 include/crypto/hkdf.h

-- 
2.35.3