67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
// 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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#include <keys/asymmetric-type.h>
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#include <linux/user_namespace.h>
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#include <linux/ima.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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bool queued = false;
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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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if (ima_should_queue_key())
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queued = ima_queue_key(keyring, payload, payload_len);
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if (queued)
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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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* The name of the keyring is also passed in the "keyring"
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* parameter to process_buffer_measurement() to check
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* if the IMA policy is configured to measure a key linked
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* to the given keyring.
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*/
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process_buffer_measurement(&nop_mnt_idmap, NULL, payload, payload_len,
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keyring->description, KEY_CHECK, 0,
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keyring->description, false, NULL, 0);
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}
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