1 /* Testing module to load key from trusted PKCS#7 message
3 * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
12 #define pr_fmt(fmt) "PKCS7key: "fmt
13 #include <linux/key.h>
14 #include <linux/err.h>
15 #include <linux/module.h>
16 #include <linux/verification.h>
17 #include <linux/key-type.h>
18 #include <keys/user-type.h>
20 MODULE_LICENSE("GPL");
21 MODULE_DESCRIPTION("PKCS#7 testing key type");
22 MODULE_AUTHOR("Red Hat, Inc.");
24 static unsigned pkcs7_usage
;
25 module_param_named(usage
, pkcs7_usage
, uint
, S_IWUSR
| S_IRUGO
);
26 MODULE_PARM_DESC(pkcs7_usage
,
27 "Usage to specify when verifying the PKCS#7 message");
30 * Retrieve the PKCS#7 message content.
32 static int pkcs7_view_content(void *ctx
, const void *data
, size_t len
,
35 struct key_preparsed_payload
*prep
= ctx
;
36 const void *saved_prep_data
;
37 size_t saved_prep_datalen
;
40 saved_prep_data
= prep
->data
;
41 saved_prep_datalen
= prep
->datalen
;
45 ret
= user_preparse(prep
);
47 prep
->data
= saved_prep_data
;
48 prep
->datalen
= saved_prep_datalen
;
53 * Preparse a PKCS#7 wrapped and validated data blob.
55 static int pkcs7_preparse(struct key_preparsed_payload
*prep
)
57 enum key_being_used_for usage
= pkcs7_usage
;
59 if (usage
>= NR__KEY_BEING_USED_FOR
) {
60 pr_err("Invalid usage type %d\n", usage
);
64 return verify_pkcs7_signature(NULL
, 0,
65 prep
->data
, prep
->datalen
,
66 VERIFY_USE_SECONDARY_KEYRING
, usage
,
67 pkcs7_view_content
, prep
);
71 * user defined keys take an arbitrary string as the description and an
72 * arbitrary blob of data as the payload
74 static struct key_type key_type_pkcs7
= {
76 .preparse
= pkcs7_preparse
,
77 .free_preparse
= user_free_preparse
,
78 .instantiate
= generic_key_instantiate
,
79 .revoke
= user_revoke
,
80 .destroy
= user_destroy
,
81 .describe
= user_describe
,
88 static int __init
pkcs7_key_init(void)
90 return register_key_type(&key_type_pkcs7
);
93 static void __exit
pkcs7_key_cleanup(void)
95 unregister_key_type(&key_type_pkcs7
);
98 module_init(pkcs7_key_init
);
99 module_exit(pkcs7_key_cleanup
);