mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
2.0 KiB
66 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0+ |
|
/* |
|
* Copyright (C) 2019 Microsoft Corporation |
|
* |
|
* Author: Lakshmi Ramasubramanian ([email protected]) |
|
* |
|
* File: ima_asymmetric_keys.c |
|
* Defines an IMA hook to measure asymmetric keys on key |
|
* create or update. |
|
*/ |
|
|
|
#include <keys/asymmetric-type.h> |
|
#include <linux/user_namespace.h> |
|
#include <linux/ima.h> |
|
#include "ima.h" |
|
|
|
/** |
|
* ima_post_key_create_or_update - measure asymmetric keys |
|
* @keyring: keyring to which the key is linked to |
|
* @key: created or updated key |
|
* @payload: The data used to instantiate or update the key. |
|
* @payload_len: The length of @payload. |
|
* @flags: key flags |
|
* @create: flag indicating whether the key was created or updated |
|
* |
|
* Keys can only be measured, not appraised. |
|
* The payload data used to instantiate or update the key is measured. |
|
*/ |
|
void ima_post_key_create_or_update(struct key *keyring, struct key *key, |
|
const void *payload, size_t payload_len, |
|
unsigned long flags, bool create) |
|
{ |
|
bool queued = false; |
|
|
|
/* Only asymmetric keys are handled by this hook. */ |
|
if (key->type != &key_type_asymmetric) |
|
return; |
|
|
|
if (!payload || (payload_len == 0)) |
|
return; |
|
|
|
if (ima_should_queue_key()) |
|
queued = ima_queue_key(keyring, payload, payload_len); |
|
|
|
if (queued) |
|
return; |
|
|
|
/* |
|
* keyring->description points to the name of the keyring |
|
* (such as ".builtin_trusted_keys", ".ima", etc.) to |
|
* which the given key is linked to. |
|
* |
|
* The name of the keyring is passed in the "eventname" |
|
* parameter to process_buffer_measurement() and is set |
|
* in the "eventname" field in ima_event_data for |
|
* the key measurement IMA event. |
|
* |
|
* The name of the keyring is also passed in the "keyring" |
|
* parameter to process_buffer_measurement() to check |
|
* if the IMA policy is configured to measure a key linked |
|
* to the given keyring. |
|
*/ |
|
process_buffer_measurement(&init_user_ns, NULL, payload, payload_len, |
|
keyring->description, KEY_CHECK, 0, |
|
keyring->description, false); |
|
}
|
|
|