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KEYS: asym_tpm: add skeleton for asym_tpm [ver analogdevicesinc#2]
This patch adds the basic skeleton for the asym_tpm asymmetric key subtype. Signed-off-by: Denis Kenzior <[email protected]> Signed-off-by: David Howells <[email protected]> Tested-by: Marcel Holtmann <[email protected]> Reviewed-by: Marcel Holtmann <[email protected]> Signed-off-by: James Morris <[email protected]>
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// SPDX-License-Identifier: GPL-2.0 | ||
#define pr_fmt(fmt) "ASYM-TPM: "fmt | ||
#include <linux/slab.h> | ||
#include <linux/module.h> | ||
#include <linux/export.h> | ||
#include <linux/kernel.h> | ||
#include <linux/seq_file.h> | ||
#include <linux/scatterlist.h> | ||
#include <linux/tpm.h> | ||
#include <keys/asymmetric-subtype.h> | ||
#include <crypto/asym_tpm_subtype.h> | ||
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/* | ||
* Provide a part of a description of the key for /proc/keys. | ||
*/ | ||
static void asym_tpm_describe(const struct key *asymmetric_key, | ||
struct seq_file *m) | ||
{ | ||
struct tpm_key *tk = asymmetric_key->payload.data[asym_crypto]; | ||
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if (!tk) | ||
return; | ||
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seq_printf(m, "TPM1.2/Blob"); | ||
} | ||
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static void asym_tpm_destroy(void *payload0, void *payload3) | ||
{ | ||
struct tpm_key *tk = payload0; | ||
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if (!tk) | ||
return; | ||
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kfree(tk->blob); | ||
tk->blob_len = 0; | ||
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kfree(tk); | ||
} | ||
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/* Given the blob, parse it and load it into the TPM */ | ||
struct tpm_key *tpm_key_create(const void *blob, uint32_t blob_len) | ||
{ | ||
int r; | ||
struct tpm_key *tk; | ||
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r = tpm_is_tpm2(NULL); | ||
if (r < 0) | ||
goto error; | ||
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/* We don't support TPM2 yet */ | ||
if (r > 0) { | ||
r = -ENODEV; | ||
goto error; | ||
} | ||
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r = -ENOMEM; | ||
tk = kzalloc(sizeof(struct tpm_key), GFP_KERNEL); | ||
if (!tk) | ||
goto error; | ||
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tk->blob = kmemdup(blob, blob_len, GFP_KERNEL); | ||
if (!tk->blob) | ||
goto error_memdup; | ||
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tk->blob_len = blob_len; | ||
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return tk; | ||
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error_memdup: | ||
kfree(tk); | ||
error: | ||
return ERR_PTR(r); | ||
} | ||
EXPORT_SYMBOL_GPL(tpm_key_create); | ||
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/* | ||
* TPM-based asymmetric key subtype | ||
*/ | ||
struct asymmetric_key_subtype asym_tpm_subtype = { | ||
.owner = THIS_MODULE, | ||
.name = "asym_tpm", | ||
.name_len = sizeof("asym_tpm") - 1, | ||
.describe = asym_tpm_describe, | ||
.destroy = asym_tpm_destroy, | ||
}; | ||
EXPORT_SYMBOL_GPL(asym_tpm_subtype); | ||
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MODULE_DESCRIPTION("TPM based asymmetric key subtype"); | ||
MODULE_AUTHOR("Intel Corporation"); | ||
MODULE_LICENSE("GPL v2"); |
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// SPDX-License-Identifier: GPL-2.0 | ||
#ifndef _LINUX_ASYM_TPM_SUBTYPE_H | ||
#define _LINUX_ASYM_TPM_SUBTYPE_H | ||
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#include <linux/keyctl.h> | ||
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struct tpm_key { | ||
void *blob; | ||
u32 blob_len; | ||
}; | ||
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struct tpm_key *tpm_key_create(const void *blob, uint32_t blob_len); | ||
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extern struct asymmetric_key_subtype asym_tpm_subtype; | ||
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#endif /* _LINUX_ASYM_TPM_SUBTYPE_H */ |