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IMA: Define an IMA hook to measure keys
Measure asymmetric keys used for verifying file signatures, certificates, etc. This patch defines a new IMA hook namely ima_post_key_create_or_update() to measure the payload used to create a new asymmetric key or update an existing asymmetric key. Asymmetric key structure is defined only when CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE is defined. Since the IMA hook measures asymmetric keys, the IMA hook is defined in a new file namely ima_asymmetric_keys.c which is built only if CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE is defined. Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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@ -12,3 +12,4 @@ ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
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ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
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ima-$(CONFIG_IMA_APPRAISE_MODSIG) += ima_modsig.o
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ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
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ima-$(CONFIG_HAVE_IMA_KEXEC) += ima_kexec.o
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obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
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obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o
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obj-$(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) += ima_asymmetric_keys.o
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52
security/integrity/ima/ima_asymmetric_keys.c
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52
security/integrity/ima/ima_asymmetric_keys.c
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@ -0,0 +1,52 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2019 Microsoft Corporation
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*
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* Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
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*
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* File: ima_asymmetric_keys.c
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* Defines an IMA hook to measure asymmetric keys on key
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* create or update.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <keys/asymmetric-type.h>
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#include "ima.h"
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/**
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* ima_post_key_create_or_update - measure asymmetric keys
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* @keyring: keyring to which the key is linked to
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* @key: created or updated key
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* @payload: The data used to instantiate or update the key.
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* @payload_len: The length of @payload.
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* @flags: key flags
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* @create: flag indicating whether the key was created or updated
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*
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* Keys can only be measured, not appraised.
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* The payload data used to instantiate or update the key is measured.
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*/
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void ima_post_key_create_or_update(struct key *keyring, struct key *key,
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const void *payload, size_t payload_len,
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unsigned long flags, bool create)
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{
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/* Only asymmetric keys are handled by this hook. */
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if (key->type != &key_type_asymmetric)
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return;
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if (!payload || (payload_len == 0))
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return;
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/*
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* keyring->description points to the name of the keyring
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* (such as ".builtin_trusted_keys", ".ima", etc.) to
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* which the given key is linked to.
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*
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* The name of the keyring is passed in the "eventname"
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* parameter to process_buffer_measurement() and is set
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* in the "eventname" field in ima_event_data for
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* the key measurement IMA event.
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*/
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process_buffer_measurement(payload, payload_len,
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keyring->description, KEY_CHECK, 0);
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}
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