Re: [PATCH v4 5/5] KEYS: trusted: Introduce support for NXP CAAM-based trusted keys

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Hello Jarkko, Mimi and James,

On 11.10.21 12:02, Ahmad Fatoum wrote:
> The Cryptographic Acceleration and Assurance Module (CAAM) is an IP core
> built into many newer i.MX and QorIQ SoCs by NXP.
> 
> The CAAM does crypto acceleration, hardware number generation and
> has a blob mechanism for encapsulation/decapsulation of sensitive material.
> 
> This blob mechanism depends on a device specific random 256-bit One Time
> Programmable Master Key that is fused in each SoC at manufacturing
> time. This key is unreadable and can only be used by the CAAM for AES
> encryption/decryption of user data.
> 
> This makes it a suitable backend (source) for kernel trusted keys.
> 
> Previous commits generalized trusted keys to support multiple backends
> and added an API to access the CAAM blob mechanism. Based on these,
> provide the necessary glue to use the CAAM for trusted keys.
> 
> Reviewed-by: David Gstir <david@sigma-star.at>
> Tested-By: Tim Harvey <tharvey@gateworks.com>
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

Is there anything I can do to make this patch more palatable to you?

Thanks,
Ahmad

> ---
> To: Jonathan Corbet <corbet@lwn.net>
> To: David Howells <dhowells@redhat.com>
> To: Jarkko Sakkinen <jarkko@kernel.org>
> To: James Bottomley <jejb@linux.ibm.com>
> To: Mimi Zohar <zohar@linux.ibm.com>
> Cc: James Morris <jmorris@namei.org>
> Cc: "Serge E. Hallyn" <serge@hallyn.com>
> Cc: "Horia Geantă" <horia.geanta@nxp.com>
> Cc: Aymen Sghaier <aymen.sghaier@nxp.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Udit Agarwal <udit.agarwal@nxp.com>
> Cc: Eric Biggers <ebiggers@kernel.org>
> Cc: Jan Luebbe <j.luebbe@pengutronix.de>
> Cc: David Gstir <david@sigma-star.at>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Franck LENORMAND <franck.lenormand@nxp.com>
> Cc: Sumit Garg <sumit.garg@linaro.org>
> Cc: keyrings@vger.kernel.org
> Cc: linux-crypto@vger.kernel.org
> Cc: linux-doc@vger.kernel.org
> Cc: linux-integrity@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: linux-security-module@vger.kernel.org
> ---
>  Documentation/admin-guide/kernel-parameters.txt   |  1 +-
>  Documentation/security/keys/trusted-encrypted.rst | 42 ++++++++-
>  MAINTAINERS                                       |  9 ++-
>  include/keys/trusted_caam.h                       | 11 ++-
>  security/keys/trusted-keys/Kconfig                | 11 +-
>  security/keys/trusted-keys/Makefile               |  2 +-
>  security/keys/trusted-keys/trusted_caam.c         | 74 ++++++++++++++++-
>  security/keys/trusted-keys/trusted_core.c         |  6 +-
>  8 files changed, 152 insertions(+), 4 deletions(-)
>  create mode 100644 include/keys/trusted_caam.h
>  create mode 100644 security/keys/trusted-keys/trusted_caam.c
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index d5969452f063..0ed1165e0f55 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5767,6 +5767,7 @@
>  			sources:
>  			- "tpm"
>  			- "tee"
> +			- "caam"
>  			If not specified then it defaults to iterating through
>  			the trust source list starting with TPM and assigns the
>  			first trust source as a backend which is initialized
> diff --git a/Documentation/security/keys/trusted-encrypted.rst b/Documentation/security/keys/trusted-encrypted.rst
> index 1d4b4b8f12f0..ad66573ca6fd 100644
> --- a/Documentation/security/keys/trusted-encrypted.rst
> +++ b/Documentation/security/keys/trusted-encrypted.rst
> @@ -35,6 +35,13 @@ safe.
>           Rooted to Hardware Unique Key (HUK) which is generally burnt in on-chip
>           fuses and is accessible to TEE only.
>  
> +     (3) CAAM (Cryptographic Acceleration and Assurance Module: IP on NXP SoCs)
> +
> +         When High Assurance Boot (HAB) is enabled and the CAAM is in secure
> +         mode, trust is rooted to the OTPMK, a never-disclosed 256-bit key
> +         randomly generated and fused into each SoC at manufacturing time.
> +         Otherwise, a common fixed test key is used instead.
> +
>    *  Execution isolation
>  
>       (1) TPM
> @@ -46,6 +53,10 @@ safe.
>           Customizable set of operations running in isolated execution
>           environment verified via Secure/Trusted boot process.
>  
> +     (3) CAAM
> +
> +         Fixed set of operations running in isolated execution environment.
> +
>    * Optional binding to platform integrity state
>  
>       (1) TPM
> @@ -63,6 +74,11 @@ safe.
>           Relies on Secure/Trusted boot process for platform integrity. It can
>           be extended with TEE based measured boot process.
>  
> +     (3) CAAM
> +
> +         Relies on the High Assurance Boot (HAB) mechanism of NXP SoCs
> +         for platform integrity.
> +
>    *  Interfaces and APIs
>  
>       (1) TPM
> @@ -74,10 +90,13 @@ safe.
>           TEEs have well-documented, standardized client interface and APIs. For
>           more details refer to ``Documentation/staging/tee.rst``.
>  
> +     (3) CAAM
> +
> +         Interface is specific to silicon vendor.
>  
>    *  Threat model
>  
> -     The strength and appropriateness of a particular TPM or TEE for a given
> +     The strength and appropriateness of a particular trust source for a given
>       purpose must be assessed when using them to protect security-relevant data.
>  
>  
> @@ -104,8 +123,14 @@ selected trust source:
>       from platform specific hardware RNG or a software based Fortuna CSPRNG
>       which can be seeded via multiple entropy sources.
>  
> +  *  CAAM: Kernel RNG
> +
> +     The normal kernel random number generator is used. To seed it from the
> +     CAAM HWRNG, enable CRYPTO_DEV_FSL_CAAM_RNG_API and ensure the device
> +     can be probed.
> +
>  Optionally, users may specify ``trusted.kernel_rng=1`` on the kernel
> -command-line to override the used RNG with the kernel's random number pool.
> +command-line to force use of the kernel's random number pool.
>  
>  Encrypted Keys
>  --------------
> @@ -192,6 +217,19 @@ Usage::
>  specific to TEE device implementation.  The key length for new keys is always
>  in bytes. Trusted Keys can be 32 - 128 bytes (256 - 1024 bits).
>  
> +Trusted Keys usage: CAAM
> +------------------------
> +
> +Usage::
> +
> +    keyctl add trusted name "new keylen" ring
> +    keyctl add trusted name "load hex_blob" ring
> +    keyctl print keyid
> +
> +"keyctl print" returns an ASCII hex copy of the sealed key, which is in format
> +specific to CAAM device implementation.  The key length for new keys is always
> +in bytes. Trusted Keys can be 32 - 128 bytes (256 - 1024 bits).
> +
>  Encrypted Keys usage
>  --------------------
>  
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a4a0c2baaf27..2c6514759222 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10364,6 +10364,15 @@ S:	Supported
>  F:	include/keys/trusted_tee.h
>  F:	security/keys/trusted-keys/trusted_tee.c
>  
> +KEYS-TRUSTED-CAAM
> +M:	Ahmad Fatoum <a.fatoum@pengutronix.de>
> +R:	Pengutronix Kernel Team <kernel@pengutronix.de>
> +L:	linux-integrity@vger.kernel.org
> +L:	keyrings@vger.kernel.org
> +S:	Supported
> +F:	include/keys/trusted_caam.h
> +F:	security/keys/trusted-keys/trusted_caam.c
> +
>  KEYS/KEYRINGS
>  M:	David Howells <dhowells@redhat.com>
>  M:	Jarkko Sakkinen <jarkko@kernel.org>
> diff --git a/include/keys/trusted_caam.h b/include/keys/trusted_caam.h
> new file mode 100644
> index 000000000000..2fba0996b0b0
> --- /dev/null
> +++ b/include/keys/trusted_caam.h
> @@ -0,0 +1,11 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
> + */
> +
> +#ifndef __CAAM_TRUSTED_KEY_H
> +#define __CAAM_TRUSTED_KEY_H
> +
> +extern struct trusted_key_ops caam_trusted_key_ops;
> +
> +#endif
> diff --git a/security/keys/trusted-keys/Kconfig b/security/keys/trusted-keys/Kconfig
> index fc4abd581abb..dbfdd8536468 100644
> --- a/security/keys/trusted-keys/Kconfig
> +++ b/security/keys/trusted-keys/Kconfig
> @@ -24,6 +24,15 @@ config TRUSTED_KEYS_TEE
>  	  Enable use of the Trusted Execution Environment (TEE) as trusted
>  	  key backend.
>  
> -if !TRUSTED_KEYS_TPM && !TRUSTED_KEYS_TEE
> +config TRUSTED_KEYS_CAAM
> +	bool "CAAM-based trusted keys"
> +	depends on CRYPTO_DEV_FSL_CAAM_JR >= TRUSTED_KEYS
> +	select CRYPTO_DEV_FSL_CAAM_BLOB_GEN
> +	default y
> +	help
> +	  Enable use of NXP's Cryptographic Accelerator and Assurance Module
> +	  (CAAM) as trusted key backend.
> +
> +if !TRUSTED_KEYS_TPM && !TRUSTED_KEYS_TEE && !TRUSTED_KEYS_CAAM
>  comment "No trust source selected!"
>  endif
> diff --git a/security/keys/trusted-keys/Makefile b/security/keys/trusted-keys/Makefile
> index 2e2371eae4d5..735aa0bc08ef 100644
> --- a/security/keys/trusted-keys/Makefile
> +++ b/security/keys/trusted-keys/Makefile
> @@ -12,3 +12,5 @@ trusted-$(CONFIG_TRUSTED_KEYS_TPM) += trusted_tpm2.o
>  trusted-$(CONFIG_TRUSTED_KEYS_TPM) += tpm2key.asn1.o
>  
>  trusted-$(CONFIG_TRUSTED_KEYS_TEE) += trusted_tee.o
> +
> +trusted-$(CONFIG_TRUSTED_KEYS_CAAM) += trusted_caam.o
> diff --git a/security/keys/trusted-keys/trusted_caam.c b/security/keys/trusted-keys/trusted_caam.c
> new file mode 100644
> index 000000000000..01adfd18adda
> --- /dev/null
> +++ b/security/keys/trusted-keys/trusted_caam.c
> @@ -0,0 +1,74 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
> + */
> +
> +#include <keys/trusted_caam.h>
> +#include <keys/trusted-type.h>
> +#include <linux/build_bug.h>
> +#include <linux/key-type.h>
> +#include <soc/fsl/caam-blob.h>
> +
> +static struct caam_blob_priv *blobifier;
> +
> +#define KEYMOD "kernel:trusted"
> +
> +static_assert(MAX_KEY_SIZE + CAAM_BLOB_OVERHEAD <= CAAM_BLOB_MAX_LEN);
> +static_assert(MAX_BLOB_SIZE <= CAAM_BLOB_MAX_LEN);
> +
> +static int trusted_caam_seal(struct trusted_key_payload *p, char *datablob)
> +{
> +	int length = p->key_len + CAAM_BLOB_OVERHEAD;
> +	int ret;
> +
> +	ret = caam_encap_blob(blobifier, KEYMOD, p->key, p->blob, length);
> +	if (ret)
> +		return ret;
> +
> +	p->blob_len = length;
> +	return 0;
> +}
> +
> +static int trusted_caam_unseal(struct trusted_key_payload *p, char *datablob)
> +{
> +	int length = p->blob_len;
> +	int ret;
> +
> +	ret = caam_decap_blob(blobifier, KEYMOD, p->blob, p->key, length);
> +	if (ret)
> +		return ret;
> +
> +	p->key_len = length - CAAM_BLOB_OVERHEAD;
> +	return 0;
> +}
> +
> +static int trusted_caam_init(void)
> +{
> +	int ret;
> +
> +	blobifier = caam_blob_gen_init();
> +	if (IS_ERR(blobifier)) {
> +		pr_err("Job Ring Device allocation for transform failed\n");
> +		return PTR_ERR(blobifier);
> +	}
> +
> +	ret = register_key_type(&key_type_trusted);
> +	if (ret)
> +		caam_blob_gen_exit(blobifier);
> +
> +	return ret;
> +}
> +
> +static void trusted_caam_exit(void)
> +{
> +	unregister_key_type(&key_type_trusted);
> +	caam_blob_gen_exit(blobifier);
> +}
> +
> +struct trusted_key_ops caam_trusted_key_ops = {
> +	.migratable = 0, /* non-migratable */
> +	.init = trusted_caam_init,
> +	.seal = trusted_caam_seal,
> +	.unseal = trusted_caam_unseal,
> +	.exit = trusted_caam_exit,
> +};
> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index d2b7626cde8b..305e44651180 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -9,6 +9,7 @@
>  #include <keys/user-type.h>
>  #include <keys/trusted-type.h>
>  #include <keys/trusted_tee.h>
> +#include <keys/trusted_caam.h>
>  #include <keys/trusted_tpm.h>
>  #include <linux/capability.h>
>  #include <linux/err.h>
> @@ -29,7 +30,7 @@ MODULE_PARM_DESC(kernel_rng, "Generate key material from kernel RNG");
>  
>  static char *trusted_key_source;
>  module_param_named(source, trusted_key_source, charp, 0);
> -MODULE_PARM_DESC(source, "Select trusted keys source (tpm or tee)");
> +MODULE_PARM_DESC(source, "Select trusted keys source (tpm, tee or caam)");
>  
>  static const struct trusted_key_source trusted_key_sources[] = {
>  #if defined(CONFIG_TRUSTED_KEYS_TPM)
> @@ -38,6 +39,9 @@ static const struct trusted_key_source trusted_key_sources[] = {
>  #if defined(CONFIG_TRUSTED_KEYS_TEE)
>  	{ "tee", &trusted_key_tee_ops },
>  #endif
> +#if defined(CONFIG_TRUSTED_KEYS_CAAM)
> +	{ "caam", &caam_trusted_key_ops },
> +#endif
>  };
>  
>  DEFINE_STATIC_CALL_NULL(trusted_key_init, *trusted_key_sources[0].ops->init);
> 


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