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fcd7c26901
The two existing trusted key sources don't make use of the kernel RNG, but instead let the hardware doing the sealing/unsealing also generate the random key material. However, both users and future backends may want to place less trust into the quality of the trust source's random number generator and instead reuse the kernel entropy pool, which can be seeded from multiple entropy sources. Make this possible by adding a new trusted.rng parameter, that will force use of the kernel RNG. In its absence, it's up to the trust source to decide, which random numbers to use, maintaining the existing behavior. Suggested-by: Jarkko Sakkinen <jarkko@kernel.org> Acked-by: Sumit Garg <sumit.garg@linaro.org> Acked-by: Pankaj Gupta <pankaj.gupta@nxp.com> Reviewed-by: David Gstir <david@sigma-star.at> Reviewed-by: Pankaj Gupta <pankaj.gupta@nxp.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Tested-by: Pankaj Gupta <pankaj.gupta@nxp.com> Tested-by: Michael Walle <michael@walle.cc> # on ls1028a (non-E and E) Tested-by: John Ernberg <john.ernberg@actia.se> # iMX8QXP Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2010 IBM Corporation
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* Author: David Safford <safford@us.ibm.com>
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*/
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#ifndef _KEYS_TRUSTED_TYPE_H
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#define _KEYS_TRUSTED_TYPE_H
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#include <linux/key.h>
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#include <linux/rcupdate.h>
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#include <linux/tpm.h>
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#ifdef pr_fmt
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#undef pr_fmt
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#endif
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#define pr_fmt(fmt) "trusted_key: " fmt
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#define MIN_KEY_SIZE 32
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#define MAX_KEY_SIZE 128
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#define MAX_BLOB_SIZE 512
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#define MAX_PCRINFO_SIZE 64
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#define MAX_DIGEST_SIZE 64
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struct trusted_key_payload {
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struct rcu_head rcu;
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unsigned int key_len;
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unsigned int blob_len;
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unsigned char migratable;
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unsigned char old_format;
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unsigned char key[MAX_KEY_SIZE + 1];
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unsigned char blob[MAX_BLOB_SIZE];
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};
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struct trusted_key_options {
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uint16_t keytype;
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uint32_t keyhandle;
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unsigned char keyauth[TPM_DIGEST_SIZE];
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uint32_t blobauth_len;
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unsigned char blobauth[TPM_DIGEST_SIZE];
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uint32_t pcrinfo_len;
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unsigned char pcrinfo[MAX_PCRINFO_SIZE];
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int pcrlock;
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uint32_t hash;
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uint32_t policydigest_len;
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unsigned char policydigest[MAX_DIGEST_SIZE];
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uint32_t policyhandle;
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};
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struct trusted_key_ops {
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/*
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* flag to indicate if trusted key implementation supports migration
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* or not.
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*/
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unsigned char migratable;
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/* Initialize key interface. */
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int (*init)(void);
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/* Seal a key. */
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int (*seal)(struct trusted_key_payload *p, char *datablob);
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/* Unseal a key. */
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int (*unseal)(struct trusted_key_payload *p, char *datablob);
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/* Optional: Get a randomized key. */
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int (*get_random)(unsigned char *key, size_t key_len);
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/* Exit key interface. */
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void (*exit)(void);
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};
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struct trusted_key_source {
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char *name;
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struct trusted_key_ops *ops;
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};
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extern struct key_type key_type_trusted;
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#define TRUSTED_DEBUG 0
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#if TRUSTED_DEBUG
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static inline void dump_payload(struct trusted_key_payload *p)
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{
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pr_info("key_len %d\n", p->key_len);
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print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
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16, 1, p->key, p->key_len, 0);
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pr_info("bloblen %d\n", p->blob_len);
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print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
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16, 1, p->blob, p->blob_len, 0);
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pr_info("migratable %d\n", p->migratable);
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}
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#else
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static inline void dump_payload(struct trusted_key_payload *p)
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{
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}
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#endif
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#endif /* _KEYS_TRUSTED_TYPE_H */
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