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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> |
22d01afb DH |
15 | #include <linux/key-type.h> |
16 | #include <crypto/pkcs7.h> | |
17 | #include <keys/user-type.h> | |
18 | #include <keys/system_keyring.h> | |
19 | #include "pkcs7_parser.h" | |
20 | ||
21 | /* | |
1ca72c96 | 22 | * Preparse a PKCS#7 wrapped and validated data blob. |
22d01afb | 23 | */ |
1ca72c96 | 24 | static int pkcs7_preparse(struct key_preparsed_payload *prep) |
22d01afb DH |
25 | { |
26 | struct pkcs7_message *pkcs7; | |
27 | const void *data, *saved_prep_data; | |
28 | size_t datalen, saved_prep_datalen; | |
29 | bool trusted; | |
30 | int ret; | |
31 | ||
32 | kenter(""); | |
33 | ||
34 | saved_prep_data = prep->data; | |
35 | saved_prep_datalen = prep->datalen; | |
36 | pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen); | |
37 | if (IS_ERR(pkcs7)) { | |
38 | ret = PTR_ERR(pkcs7); | |
39 | goto error; | |
40 | } | |
41 | ||
42 | ret = pkcs7_verify(pkcs7); | |
43 | if (ret < 0) | |
44 | goto error_free; | |
45 | ||
46 | ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted); | |
47 | if (ret < 0) | |
48 | goto error_free; | |
49 | if (!trusted) | |
50 | pr_warn("PKCS#7 message doesn't chain back to a trusted key\n"); | |
51 | ||
52 | ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false); | |
53 | if (ret < 0) | |
54 | goto error_free; | |
55 | ||
56 | prep->data = data; | |
57 | prep->datalen = datalen; | |
1ca72c96 | 58 | ret = user_preparse(prep); |
22d01afb DH |
59 | prep->data = saved_prep_data; |
60 | prep->datalen = saved_prep_datalen; | |
61 | ||
62 | error_free: | |
63 | pkcs7_free_message(pkcs7); | |
64 | error: | |
65 | kleave(" = %d", ret); | |
66 | return ret; | |
67 | } | |
68 | ||
69 | /* | |
70 | * user defined keys take an arbitrary string as the description and an | |
71 | * arbitrary blob of data as the payload | |
72 | */ | |
73 | struct key_type key_type_pkcs7 = { | |
74 | .name = "pkcs7_test", | |
75 | .def_lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, | |
1ca72c96 DH |
76 | .preparse = pkcs7_preparse, |
77 | .free_preparse = user_free_preparse, | |
78 | .instantiate = generic_key_instantiate, | |
22d01afb DH |
79 | .match = user_match, |
80 | .revoke = user_revoke, | |
81 | .destroy = user_destroy, | |
82 | .describe = user_describe, | |
83 | .read = user_read, | |
84 | }; | |
85 | ||
86 | /* | |
87 | * Module stuff | |
88 | */ | |
89 | static int __init pkcs7_key_init(void) | |
90 | { | |
91 | return register_key_type(&key_type_pkcs7); | |
92 | } | |
93 | ||
94 | static void __exit pkcs7_key_cleanup(void) | |
95 | { | |
96 | unregister_key_type(&key_type_pkcs7); | |
97 | } | |
98 | ||
99 | module_init(pkcs7_key_init); | |
100 | module_exit(pkcs7_key_cleanup); |