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