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22d01afb DH |
1 | /* Testing module to load key from trusted PKCS#7 message |
2 | * | |
3 | * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
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. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "PKCS7key: "fmt | |
13 | #include <linux/key.h> | |
8f3438cc | 14 | #include <linux/err.h> |
88775588 | 15 | #include <linux/module.h> |
e68503bd | 16 | #include <linux/verification.h> |
22d01afb | 17 | #include <linux/key-type.h> |
22d01afb | 18 | #include <keys/user-type.h> |
22d01afb | 19 | |
772111ab DH |
20 | MODULE_LICENSE("GPL"); |
21 | MODULE_DESCRIPTION("PKCS#7 testing key type"); | |
1e684d38 | 22 | MODULE_AUTHOR("Red Hat, Inc."); |
772111ab | 23 | |
99db4435 DH |
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"); | |
28 | ||
22d01afb | 29 | /* |
e68503bd | 30 | * Retrieve the PKCS#7 message content. |
22d01afb | 31 | */ |
e68503bd DH |
32 | static int pkcs7_view_content(void *ctx, const void *data, size_t len, |
33 | size_t asn1hdrlen) | |
22d01afb | 34 | { |
e68503bd DH |
35 | struct key_preparsed_payload *prep = ctx; |
36 | const void *saved_prep_data; | |
37 | size_t saved_prep_datalen; | |
22d01afb DH |
38 | int ret; |
39 | ||
22d01afb DH |
40 | saved_prep_data = prep->data; |
41 | saved_prep_datalen = prep->datalen; | |
22d01afb | 42 | prep->data = data; |
e68503bd DH |
43 | prep->datalen = len; |
44 | ||
1ca72c96 | 45 | ret = user_preparse(prep); |
e68503bd | 46 | |
22d01afb DH |
47 | prep->data = saved_prep_data; |
48 | prep->datalen = saved_prep_datalen; | |
22d01afb DH |
49 | return ret; |
50 | } | |
51 | ||
e68503bd DH |
52 | /* |
53 | * Preparse a PKCS#7 wrapped and validated data blob. | |
54 | */ | |
55 | static int pkcs7_preparse(struct key_preparsed_payload *prep) | |
56 | { | |
57 | enum key_being_used_for usage = pkcs7_usage; | |
58 | ||
59 | if (usage >= NR__KEY_BEING_USED_FOR) { | |
60 | pr_err("Invalid usage type %d\n", usage); | |
61 | return -EINVAL; | |
62 | } | |
63 | ||
64 | return verify_pkcs7_signature(NULL, 0, | |
65 | prep->data, prep->datalen, | |
3c8f2278 | 66 | (void *)1UL, usage, |
e68503bd DH |
67 | pkcs7_view_content, prep); |
68 | } | |
69 | ||
22d01afb DH |
70 | /* |
71 | * user defined keys take an arbitrary string as the description and an | |
72 | * arbitrary blob of data as the payload | |
73 | */ | |
63d2551e | 74 | static struct key_type key_type_pkcs7 = { |
22d01afb | 75 | .name = "pkcs7_test", |
1ca72c96 DH |
76 | .preparse = pkcs7_preparse, |
77 | .free_preparse = user_free_preparse, | |
78 | .instantiate = generic_key_instantiate, | |
22d01afb DH |
79 | .revoke = user_revoke, |
80 | .destroy = user_destroy, | |
81 | .describe = user_describe, | |
82 | .read = user_read, | |
83 | }; | |
84 | ||
85 | /* | |
86 | * Module stuff | |
87 | */ | |
88 | static int __init pkcs7_key_init(void) | |
89 | { | |
90 | return register_key_type(&key_type_pkcs7); | |
91 | } | |
92 | ||
93 | static void __exit pkcs7_key_cleanup(void) | |
94 | { | |
95 | unregister_key_type(&key_type_pkcs7); | |
96 | } | |
97 | ||
98 | module_init(pkcs7_key_init); | |
99 | module_exit(pkcs7_key_cleanup); |