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integrity: digital signature verification using multiple keyrings
Define separate keyrings for each of the different use cases - evm, ima, and modules. Using different keyrings improves search performance, and also allows "locking" specific keyring to prevent adding new keys. This is useful for evm and module keyrings, when keys are usually only added from initramfs. Signed-off-by: Dmitry Kasatkin <[email protected]>
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Dmitry Kasatkin
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Nov 9, 2011
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Copyright (C) 2011 Intel Corporation | ||
* | ||
* Author: | ||
* Dmitry Kasatkin <[email protected]> | ||
* | ||
* This program is free software; you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation, version 2 of the License. | ||
* | ||
*/ | ||
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | ||
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#include <linux/err.h> | ||
#include <linux/rbtree.h> | ||
#include <linux/key-type.h> | ||
#include <linux/digsig.h> | ||
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#include "integrity.h" | ||
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static struct key *keyring[INTEGRITY_KEYRING_MAX]; | ||
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static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { | ||
"_evm", | ||
"_module", | ||
"_ima", | ||
}; | ||
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int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | ||
const char *digest, int digestlen) | ||
{ | ||
if (id >= INTEGRITY_KEYRING_MAX) | ||
return -EINVAL; | ||
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if (!keyring[id]) { | ||
keyring[id] = | ||
request_key(&key_type_keyring, keyring_name[id], NULL); | ||
if (IS_ERR(keyring[id])) { | ||
int err = PTR_ERR(keyring[id]); | ||
pr_err("no %s keyring: %d\n", keyring_name[id], err); | ||
keyring[id] = NULL; | ||
return err; | ||
} | ||
} | ||
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return digsig_verify(keyring[id], sig, siglen, digest, digestlen); | ||
} |
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