system_keyring.c (77f68bac9481ad440f4f34dda3d28c2dce6eb87b) system_keyring.c (d3bfe84129f65e0af2450743ebdab33d161d01c9)
1/* System trusted keyring for trusted public keys
2 *
3 * Copyright (C) 2012 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

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13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/cred.h>
16#include <linux/err.h>
17#include <keys/asymmetric-type.h>
18#include <keys/system_keyring.h>
19#include <crypto/pkcs7.h>
20
1/* System trusted keyring for trusted public keys
2 *
3 * Copyright (C) 2012 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

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13#include <linux/kernel.h>
14#include <linux/sched.h>
15#include <linux/cred.h>
16#include <linux/err.h>
17#include <keys/asymmetric-type.h>
18#include <keys/system_keyring.h>
19#include <crypto/pkcs7.h>
20
21static struct key *system_trusted_keyring;
21static struct key *builtin_trusted_keys;
22#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
23static struct key *secondary_trusted_keys;
24#endif
22
23extern __initconst const u8 system_certificate_list[];
24extern __initconst const unsigned long system_certificate_list_size;
25
26/**
25
26extern __initconst const u8 system_certificate_list[];
27extern __initconst const unsigned long system_certificate_list_size;
28
29/**
27 * restrict_link_by_builtin_trusted - Restrict keyring addition by system CA
30 * restrict_link_to_builtin_trusted - Restrict keyring addition by built in CA
28 *
29 * Restrict the addition of keys into a keyring based on the key-to-be-added
31 *
32 * Restrict the addition of keys into a keyring based on the key-to-be-added
30 * being vouched for by a key in the system keyring.
33 * being vouched for by a key in the built in system keyring.
31 */
32int restrict_link_by_builtin_trusted(struct key *keyring,
33 const struct key_type *type,
34 const union key_payload *payload)
35{
34 */
35int restrict_link_by_builtin_trusted(struct key *keyring,
36 const struct key_type *type,
37 const union key_payload *payload)
38{
36 return restrict_link_by_signature(system_trusted_keyring,
37 type, payload);
39 return restrict_link_by_signature(builtin_trusted_keys, type, payload);
38}
39
40}
41
42#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
43/**
44 * restrict_link_by_builtin_and_secondary_trusted - Restrict keyring
45 * addition by both builtin and secondary keyrings
46 *
47 * Restrict the addition of keys into a keyring based on the key-to-be-added
48 * being vouched for by a key in either the built-in or the secondary system
49 * keyrings.
50 */
51int restrict_link_by_builtin_and_secondary_trusted(
52 struct key *keyring,
53 const struct key_type *type,
54 const union key_payload *payload)
55{
56 /* If we have a secondary trusted keyring, then that contains a link
57 * through to the builtin keyring and the search will follow that link.
58 */
59 if (type == &key_type_keyring &&
60 keyring == secondary_trusted_keys &&
61 payload == &builtin_trusted_keys->payload)
62 /* Allow the builtin keyring to be added to the secondary */
63 return 0;
64
65 return restrict_link_by_signature(secondary_trusted_keys, type, payload);
66}
67#endif
68
40/*
69/*
41 * Load the compiled-in keys
70 * Create the trusted keyrings
42 */
43static __init int system_trusted_keyring_init(void)
44{
71 */
72static __init int system_trusted_keyring_init(void)
73{
45 pr_notice("Initialise system trusted keyring\n");
74 pr_notice("Initialise system trusted keyrings\n");
46
75
47 system_trusted_keyring =
48 keyring_alloc(".system_keyring",
76 builtin_trusted_keys =
77 keyring_alloc(".builtin_trusted_keys",
49 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
50 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
51 KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
52 KEY_ALLOC_NOT_IN_QUOTA,
78 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
79 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
80 KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
81 KEY_ALLOC_NOT_IN_QUOTA,
53 restrict_link_by_builtin_trusted, NULL);
54 if (IS_ERR(system_trusted_keyring))
55 panic("Can't allocate system trusted keyring\n");
82 NULL, NULL);
83 if (IS_ERR(builtin_trusted_keys))
84 panic("Can't allocate builtin trusted keyring\n");
85
86#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
87 secondary_trusted_keys =
88 keyring_alloc(".secondary_trusted_keys",
89 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
90 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
91 KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH |
92 KEY_USR_WRITE),
93 KEY_ALLOC_NOT_IN_QUOTA,
94 restrict_link_by_builtin_and_secondary_trusted,
95 NULL);
96 if (IS_ERR(secondary_trusted_keys))
97 panic("Can't allocate secondary trusted keyring\n");
98
99 if (key_link(secondary_trusted_keys, builtin_trusted_keys) < 0)
100 panic("Can't link trusted keyrings\n");
101#endif
102
56 return 0;
57}
58
59/*
60 * Must be initialised before we try and load the keys into the keyring.
61 */
62device_initcall(system_trusted_keyring_init);
63

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83 if (p[0] != 0x30 &&
84 p[1] != 0x82)
85 goto dodgy_cert;
86 plen = (p[2] << 8) | p[3];
87 plen += 4;
88 if (plen > end - p)
89 goto dodgy_cert;
90
103 return 0;
104}
105
106/*
107 * Must be initialised before we try and load the keys into the keyring.
108 */
109device_initcall(system_trusted_keyring_init);
110

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130 if (p[0] != 0x30 &&
131 p[1] != 0x82)
132 goto dodgy_cert;
133 plen = (p[2] << 8) | p[3];
134 plen += 4;
135 if (plen > end - p)
136 goto dodgy_cert;
137
91 key = key_create_or_update(make_key_ref(system_trusted_keyring, 1),
138 key = key_create_or_update(make_key_ref(builtin_trusted_keys, 1),
92 "asymmetric",
93 NULL,
94 p,
95 plen,
96 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
97 KEY_USR_VIEW | KEY_USR_READ),
98 KEY_ALLOC_NOT_IN_QUOTA |
99 KEY_ALLOC_BUILT_IN |

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120#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
121
122/**
123 * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data.
124 * @data: The data to be verified (NULL if expecting internal data).
125 * @len: Size of @data.
126 * @raw_pkcs7: The PKCS#7 message that is the signature.
127 * @pkcs7_len: The size of @raw_pkcs7.
139 "asymmetric",
140 NULL,
141 p,
142 plen,
143 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
144 KEY_USR_VIEW | KEY_USR_READ),
145 KEY_ALLOC_NOT_IN_QUOTA |
146 KEY_ALLOC_BUILT_IN |

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167#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
168
169/**
170 * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data.
171 * @data: The data to be verified (NULL if expecting internal data).
172 * @len: Size of @data.
173 * @raw_pkcs7: The PKCS#7 message that is the signature.
174 * @pkcs7_len: The size of @raw_pkcs7.
128 * @trusted_keys: Trusted keys to use (NULL for system_trusted_keyring).
175 * @trusted_keys: Trusted keys to use (NULL for builtin trusted keys only,
176 * (void *)1UL for all trusted keys).
129 * @usage: The use to which the key is being put.
130 * @view_content: Callback to gain access to content.
131 * @ctx: Context for callback.
132 */
133int verify_pkcs7_signature(const void *data, size_t len,
134 const void *raw_pkcs7, size_t pkcs7_len,
135 struct key *trusted_keys,
136 enum key_being_used_for usage,

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152 ret = -EBADMSG;
153 goto error;
154 }
155
156 ret = pkcs7_verify(pkcs7, usage);
157 if (ret < 0)
158 goto error;
159
177 * @usage: The use to which the key is being put.
178 * @view_content: Callback to gain access to content.
179 * @ctx: Context for callback.
180 */
181int verify_pkcs7_signature(const void *data, size_t len,
182 const void *raw_pkcs7, size_t pkcs7_len,
183 struct key *trusted_keys,
184 enum key_being_used_for usage,

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200 ret = -EBADMSG;
201 goto error;
202 }
203
204 ret = pkcs7_verify(pkcs7, usage);
205 if (ret < 0)
206 goto error;
207
160 if (!trusted_keys)
161 trusted_keys = system_trusted_keyring;
208 if (!trusted_keys) {
209 trusted_keys = builtin_trusted_keys;
210 } else if (trusted_keys == (void *)1UL) {
211#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
212 trusted_keys = secondary_trusted_keys;
213#else
214 trusted_keys = builtin_trusted_keys;
215#endif
216 }
162 ret = pkcs7_validate_trust(pkcs7, trusted_keys);
163 if (ret < 0) {
164 if (ret == -ENOKEY)
165 pr_err("PKCS#7 signature not signed with a trusted key\n");
166 goto error;
167 }
168
169 if (view_content) {

--- 20 unchanged lines hidden --- 		217 ret = pkcs7_validate_trust(pkcs7, trusted_keys);
218 if (ret < 0) {
219 if (ret == -ENOKEY)
220 pr_err("PKCS#7 signature not signed with a trusted key\n");
221 goto error;
222 }
223
224 if (view_content) {

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