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Thu, 6 Oct 2022 12:02:45 +0000 From: Pankaj Gupta To: jarkko@kernel.org, a.fatoum@pengutronix.de, gilad@benyossef.com, Jason@zx2c4.com, jejb@linux.ibm.com, zohar@linux.ibm.com, dhowells@redhat.com, sumit.garg@linaro.org, david@sigma-star.at, michael@walle.cc, john.ernberg@actia.se, jmorris@namei.org, serge@hallyn.com, herbert@gondor.apana.org.au, davem@davemloft.net, j.luebbe@pengutronix.de, ebiggers@kernel.org, richard@nod.at, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, sahil.malhotra@nxp.com, kshitiz.varshney@nxp.com, horia.geanta@nxp.com, V.Sethi@nxp.com Cc: Pankaj Gupta Subject: [PATCH v0 0/8] Hardware Bound key added to Trusted Key-Ring Date: Thu, 6 Oct 2022 18:38:29 +0530 Message-Id: <20221006130837.17587-1-pankaj.gupta@nxp.com> X-Mailer: git-send-email 2.17.1 X-ClientProxiedBy: SI1PR02CA0011.apcprd02.prod.outlook.com (2603:1096:4:1f7::19) To DU2PR04MB8630.eurprd04.prod.outlook.com (2603:10a6:10:2dd::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU2PR04MB8630:EE_|VI1PR04MB7008:EE_ X-MS-Office365-Filtering-Correlation-Id: fda89363-1bf2-4e84-02c8-08daa792adc2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Thus, it is un-usable, even if somehow fetched from kernel memory. It ensures run-time security. This patchset establishes a generic bridge between HBK & the kernel's trusted-keyring. This patchset adds generic support for identifying if the key is HBK. Note: Copy-paste this text-based block diagram to notepad, for better clarity. +---------------+ | | | keyctl | | | +-------+-------+ | | +-----------------------+-------------------------+ | trusted keyring | | +---------------+ | | +-----------------+ |trusted-key | | | | |-------->|payload (plain)| | | | | +---------------+ | |-->| trusted key | +---------------+ | | | source as CAAM |-------->| trusted-key | | | +-----------------+ | payload (HBK)| | | +-------^-------+ | +---------------------------------------|---------+ | | | +----------------+ crypt_alloc_tfms +-------|------------------+ | Kernel |<------------------| DM-Crypt | | Crypto-API | | +---------------------+ | | |------------------>| |struct crypto_tfm: | | +----------------+ crypto_tfm(HBK) | |- flag-is_hbk | | | |- struct-hbk_info, | | | |is copied from the | | | |tkp structure | | | +---------------------+ | +------------|-------------+ | | |crypto_tfm(HBK) | +---------------|--------------+ | Hardware crypto driver | | | | Processing the incoming | | key based on the flag | | - as plain key, if is_hbk = 0| | - as HBK, if is_hbk = 1 | +------------------------------+ Major additions done: (in brief) - Newly added: -- flag-'is_hbk', and -- struct hw_bound_key_info hbk_info, added to the structures - tfm & trusted key payload. - Enhanced the 'keyctl' command to generate the hardware bound key as trusted key. -- at the time of generating the HBK, the values: 'flag - is_hbk' & structure 'hbk_info', in the trusted key payload, is set by the hw driver, generating or loading the key in the trusted key-ring. - Applications like dm-crypt, -- first fetch the key from trusted key-ring. As part of doing this, application retains the values of: 'flag - is_hbk' & structure 'hbk_info'. -- to use kernel crypto api, after allocating the transformation, application sets the 'flag - is_hbk' & structure 'hbk_info', to the tfm allocated from crypto_alloc_tfm(). - Newly added information to tfm, helps to influence the core processing logic for the encapsulated algorithm. First implementation is based on CAAM. NXP built CAAM IP is the Cryptographic Acceleration and Assurance Module. This is contain by the i.MX and QorIQ SoCs by NXP. CAAM is a suitable backend (source) for kernel trusted keys. This backend source can be used for run-time security as well by generating the hardware bound key. Along with plain key, the CAAM generates black key. A black key is an encrypted key, which can only be decrypted inside CAAM. Hence, CAAM's black key can only be used by CAAM. Thus it is declared as a hardware bound key. Pankaj Gupta (8): hw-bound-key: introducing the generic structure keys-trusted: new cmd line option added crypto: hbk flags & info added to the tfm sk_cipher: checking for hw bound operation keys-trusted: re-factored caam based trusted key KEYS: trusted: caam based black key caam alg: symmetric key ciphers are updated dm-crypt: consumer-app setting the flag-is_hbk crypto/skcipher.c | 3 +- drivers/crypto/caam/blob_gen.c | 221 ++++++++++++++++++++-- drivers/crypto/caam/caamalg.c | 43 ++++- drivers/crypto/caam/caamalg_desc.c | 8 +- drivers/crypto/caam/desc.h | 8 +- drivers/crypto/caam/desc_constr.h | 6 +- drivers/md/dm-crypt.c | 12 +- include/keys/trusted-type.h | 4 + include/linux/crypto.h | 5 + include/linux/hw_bound_key.h | 27 +++ include/soc/fsl/caam-blob.h | 38 ++-- security/keys/trusted-keys/trusted_caam.c | 8 + security/keys/trusted-keys/trusted_core.c | 16 ++ 13 files changed, 356 insertions(+), 43 deletions(-) create mode 100644 include/linux/hw_bound_key.h