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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* Testing module to load key from trusted PKCS#7 message
- *
- * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
- #define pr_fmt(fmt) "PKCS7key: "fmt
- #include <linux/key.h>
- #include <linux/err.h>
- #include <linux/module.h>
- #include <linux/verification.h>
- #include <linux/key-type.h>
- #include <keys/user-type.h>
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("PKCS#7 testing key type");
- MODULE_AUTHOR("Red Hat, Inc.");
- static unsigned pkcs7_usage;
- module_param_named(usage, pkcs7_usage, uint, S_IWUSR | S_IRUGO);
- MODULE_PARM_DESC(pkcs7_usage,
- "Usage to specify when verifying the PKCS#7 message");
- /*
- * Retrieve the PKCS#7 message content.
- */
- static int pkcs7_view_content(void *ctx, const void *data, size_t len,
- size_t asn1hdrlen)
- {
- struct key_preparsed_payload *prep = ctx;
- const void *saved_prep_data;
- size_t saved_prep_datalen;
- int ret;
- saved_prep_data = prep->data;
- saved_prep_datalen = prep->datalen;
- prep->data = data;
- prep->datalen = len;
- ret = user_preparse(prep);
- prep->data = saved_prep_data;
- prep->datalen = saved_prep_datalen;
- return ret;
- }
- /*
- * Preparse a PKCS#7 wrapped and validated data blob.
- */
- static int pkcs7_preparse(struct key_preparsed_payload *prep)
- {
- enum key_being_used_for usage = pkcs7_usage;
- if (usage >= NR__KEY_BEING_USED_FOR) {
- pr_err("Invalid usage type %d\n", usage);
- return -EINVAL;
- }
- return verify_pkcs7_signature(NULL, 0,
- prep->data, prep->datalen,
- VERIFY_USE_SECONDARY_KEYRING, usage,
- pkcs7_view_content, prep);
- }
- /*
- * user defined keys take an arbitrary string as the description and an
- * arbitrary blob of data as the payload
- */
- static struct key_type key_type_pkcs7 = {
- .name = "pkcs7_test",
- .preparse = pkcs7_preparse,
- .free_preparse = user_free_preparse,
- .instantiate = generic_key_instantiate,
- .revoke = user_revoke,
- .destroy = user_destroy,
- .describe = user_describe,
- .read = user_read,
- };
- /*
- * Module stuff
- */
- static int __init pkcs7_key_init(void)
- {
- return register_key_type(&key_type_pkcs7);
- }
- static void __exit pkcs7_key_cleanup(void)
- {
- unregister_key_type(&key_type_pkcs7);
- }
- module_init(pkcs7_key_init);
- module_exit(pkcs7_key_cleanup);
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