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1 | /* In-software asymmetric public-key crypto subtype |
2 | * |
3 | * See Documentation/crypto/asymmetric-keys.txt |
4 | * |
5 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. |
6 | * Written by David Howells (dhowells@redhat.com) |
7 | * |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public Licence |
10 | * as published by the Free Software Foundation; either version |
11 | * 2 of the Licence, or (at your option) any later version. |
12 | */ |
13 | |
14 | #define pr_fmt(fmt) "PKEY: "fmt |
15 | #include <linux/module.h> |
16 | #include <linux/export.h> |
17 | #include <linux/kernel.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/seq_file.h> |
20 | #include <keys/asymmetric-subtype.h> |
21 | #include "public_key.h" |
22 | |
23 | MODULE_LICENSE("GPL"); |
24 | |
25 | const char *const pkey_algo_name[PKEY_ALGO__LAST] = { |
26 | [PKEY_ALGO_DSA] = "DSA", |
27 | [PKEY_ALGO_RSA] = "RSA", |
28 | }; |
29 | EXPORT_SYMBOL_GPL(pkey_algo_name); |
30 | |
31 | const struct public_key_algorithm *pkey_algo[PKEY_ALGO__LAST] = { |
32 | #if defined(CONFIG_PUBLIC_KEY_ALGO_RSA) || \ |
33 | defined(CONFIG_PUBLIC_KEY_ALGO_RSA_MODULE) |
34 | [PKEY_ALGO_RSA] = &RSA_public_key_algorithm, |
35 | #endif |
36 | }; |
37 | EXPORT_SYMBOL_GPL(pkey_algo); |
38 | |
39 | const char *const pkey_id_type_name[PKEY_ID_TYPE__LAST] = { |
40 | [PKEY_ID_PGP] = "PGP", |
41 | [PKEY_ID_X509] = "X509", |
42 | }; |
43 | EXPORT_SYMBOL_GPL(pkey_id_type_name); |
44 | |
45 | /* |
46 | * Provide a part of a description of the key for /proc/keys. |
47 | */ |
48 | static void public_key_describe(const struct key *asymmetric_key, |
49 | struct seq_file *m) |
50 | { |
51 | struct public_key *key = asymmetric_key->payload.data; |
52 | |
53 | if (key) |
54 | seq_printf(m, "%s.%s", |
55 | pkey_id_type_name[key->id_type], key->algo->name); |
56 | } |
57 | |
58 | /* |
59 | * Destroy a public key algorithm key. |
60 | */ |
61 | void public_key_destroy(void *payload) |
62 | { |
63 | struct public_key *key = payload; |
64 | int i; |
65 | |
66 | if (key) { |
67 | for (i = 0; i < ARRAY_SIZE(key->mpi); i++) |
68 | mpi_free(key->mpi[i]); |
69 | kfree(key); |
70 | } |
71 | } |
72 | EXPORT_SYMBOL_GPL(public_key_destroy); |
73 | |
74 | /* |
75 | * Verify a signature using a public key. |
76 | */ |
77 | int public_key_verify_signature(const struct public_key *pk, |
78 | const struct public_key_signature *sig) |
79 | { |
80 | const struct public_key_algorithm *algo; |
81 | |
82 | BUG_ON(!pk); |
83 | BUG_ON(!pk->mpi[0]); |
84 | BUG_ON(!pk->mpi[1]); |
85 | BUG_ON(!sig); |
86 | BUG_ON(!sig->digest); |
87 | BUG_ON(!sig->mpi[0]); |
88 | |
89 | algo = pk->algo; |
90 | if (!algo) { |
91 | if (pk->pkey_algo >= PKEY_ALGO__LAST) |
92 | return -ENOPKG; |
93 | algo = pkey_algo[pk->pkey_algo]; |
94 | if (!algo) |
95 | return -ENOPKG; |
96 | } |
97 | |
98 | if (!algo->verify_signature) |
99 | return -ENOTSUPP; |
100 | |
101 | if (sig->nr_mpi != algo->n_sig_mpi) { |
102 | pr_debug("Signature has %u MPI not %u\n", |
103 | sig->nr_mpi, algo->n_sig_mpi); |
104 | return -EINVAL; |
105 | } |
106 | |
107 | return algo->verify_signature(pk, sig); |
108 | } |
109 | EXPORT_SYMBOL_GPL(public_key_verify_signature); |
110 | |
111 | static int public_key_verify_signature_2(const struct key *key, |
112 | const struct public_key_signature *sig) |
113 | { |
114 | const struct public_key *pk = key->payload.data; |
115 | return public_key_verify_signature(pk, sig); |
116 | } |
117 | |
118 | /* |
119 | * Public key algorithm asymmetric key subtype |
120 | */ |
121 | struct asymmetric_key_subtype public_key_subtype = { |
122 | .owner = THIS_MODULE, |
123 | .name = "public_key", |
124 | .name_len = sizeof("public_key") - 1, |
125 | .describe = public_key_describe, |
126 | .destroy = public_key_destroy, |
127 | .verify_signature = public_key_verify_signature_2, |
128 | }; |
129 | EXPORT_SYMBOL_GPL(public_key_subtype); |
130 |
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