1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* Copyright (C) 2013 Intel Corporation
*
* Author:
* Dmitry Kasatkin <dmitry.kasatkin@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/err.h>
#include <linux/ratelimit.h>
#include <linux/key-type.h>
#include <crypto/public_key.h>
#include <keys/asymmetric-type.h>
#include <keys/system_keyring.h>
#include "integrity.h"
/*
* Request an asymmetric key.
*/
static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid)
{
struct key *key;
char name[12];
sprintf(name, "id:%08x", keyid);
pr_debug("key search: \"%s\"\n", name);
key = get_ima_blacklist_keyring();
if (key) {
key_ref_t kref;
kref = keyring_search(make_key_ref(key, 1),
&key_type_asymmetric, name);
if (!IS_ERR(kref)) {
pr_err("Key '%s' is in ima_blacklist_keyring\n", name);
return ERR_PTR(-EKEYREJECTED);
}
}
if (keyring) {
/* search in specific keyring */
key_ref_t kref;
kref = keyring_search(make_key_ref(keyring, 1),
&key_type_asymmetric, name);
if (IS_ERR(kref))
key = ERR_CAST(kref);
else
key = key_ref_to_ptr(kref);
} else {
key = request_key(&key_type_asymmetric, name, NULL);
}
if (IS_ERR(key)) {
pr_err_ratelimited("Request for unknown key '%s' err %ld\n",
name, PTR_ERR(key));
switch (PTR_ERR(key)) {
/* Hide some search errors */
case -EACCES:
case -ENOTDIR:
case -EAGAIN:
return ERR_PTR(-ENOKEY);
default:
return key;
}
}
pr_debug("%s() = 0 [%x]\n", __func__, key_serial(key));
return key;
}
int asymmetric_verify(struct key *keyring, const char *sig,
int siglen, const char *data, int datalen)
{
struct public_key_signature pks;
struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig;
struct key *key;
int ret = -ENOMEM;
if (siglen <= sizeof(*hdr))
return -EBADMSG;
siglen -= sizeof(*hdr);
if (siglen != __be16_to_cpu(hdr->sig_size))
return -EBADMSG;
if (hdr->hash_algo >= PKEY_HASH__LAST)
return -ENOPKG;
key = request_asymmetric_key(keyring, __be32_to_cpu(hdr->keyid));
if (IS_ERR(key))
return PTR_ERR(key);
memset(&pks, 0, sizeof(pks));
pks.pkey_hash_algo = hdr->hash_algo;
pks.digest = (u8 *)data;
pks.digest_size = datalen;
pks.s = hdr->sig;
pks.s_size = siglen;
ret = verify_signature(key, &pks);
key_put(key);
pr_debug("%s() = %d\n", __func__, ret);
return ret;
}
|
