[PATCHv4 00/19] nvme: implement secure concatenation

[Hannes Reinecke <hare@kernel.org>]

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, as the current implementation of the TCP
driver doesn't allow us to skip I/O queue initialisation.
But the queues are never started, and the namespace scan is skipped,
so the I/O queues are never visible to userspace until TLS has
been enabled.

As usual, comments and reviews are welcome.

Patchset can be found at
git.kernel.org:/pub/scm/linux/kernel/git/hare/nvme.git
branch secure-concat.v4

Changes to v3:
- Include reviews from Sagi
- Do not start I/O queues after DH-HMAC-CHAP negotiation
- Use bool to indicate TLS has been enabled on a queue
- Add 'tls_keyring' sysfs attribute
- Add 'tls_configured_key' sysfs attribute

Changes to v2:
- Fixup reset after dhchap negotiation
- Disable namespace scanning on I/O queues after
  dhchap negotiation
  - Reworked TLS key handling (again)

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

Hannes Reinecke (19):
  nvme-keyring: restrict match length for version '1' identifiers
  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-tcp: sanitize TLS key handling
  nvme-tcp: check for invalidated or revoked key
  nvme: add a newline to the 'tls_key' sysfs attribute
  nvme-sysfs: add 'tls_configured_key' sysfs attribute
  nvme-sysfs: add 'tls_keyring' attribute
  nvme-tcp: request secure channel concatenation
  nvme-fabrics: reset connection for secure concatenation
  nvme-tcp: reset after recovery for secure concatenation
  nvme-tcp: do not start queues when TLS is not enabled for secure
    concatenation
  nvmet-auth: allow to clear DH-HMAC-CHAP keys
  nvme-target: do not check authentication status for admin commands
    twice
  nvme-target: do not check authentication status for I/O commands twice
  nvmet-tcp: support secure channel concatenation

 crypto/Makefile                        |   1 +
 crypto/hkdf.c                          | 112 +++++++++
 drivers/nvme/common/auth.c             | 303 +++++++++++++++++++++++++
 drivers/nvme/common/keyring.c          | 103 ++++++++-
 drivers/nvme/host/auth.c               | 105 ++++++++-
 drivers/nvme/host/core.c               |   9 +-
 drivers/nvme/host/fabrics.c            |  40 +++-
 drivers/nvme/host/fabrics.h            |   3 +
 drivers/nvme/host/nvme.h               |   2 +-
 drivers/nvme/host/sysfs.c              |  37 ++-
 drivers/nvme/host/tcp.c                | 130 +++++++++--
 drivers/nvme/target/admin-cmd.c        |   3 +-
 drivers/nvme/target/auth.c             |  84 ++++++-
 drivers/nvme/target/core.c             |   3 -
 drivers/nvme/target/fabrics-cmd-auth.c |  46 +++-
 drivers/nvme/target/fabrics-cmd.c      |  29 ++-
 drivers/nvme/target/nvmet.h            |  30 ++-
 drivers/nvme/target/tcp.c              |  25 +-
 fs/crypto/hkdf.c                       |  68 +-----
 include/crypto/hkdf.h                  |  18 ++
 include/linux/nvme-auth.h              |   7 +
 include/linux/nvme-keyring.h           |  10 +-
 include/linux/nvme.h                   |   7 +
 23 files changed, 1051 insertions(+), 124 deletions(-)
 create mode 100644 crypto/hkdf.c
 create mode 100644 include/crypto/hkdf.h

-- 
2.35.3