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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <libcryptsetup.h>
#include "cryptsetup-token.h"
#include "cryptsetup-token-util.h"
#include "hexdecoct.h"
#include "json.h"
#include "luks2-pkcs11.h"
#include "memory-util.h"
#include "pkcs11-util.h"
#include "version.h"
#define TOKEN_NAME "systemd-pkcs11"
#define TOKEN_VERSION_MAJOR "1"
#define TOKEN_VERSION_MINOR "0"
/* for libcryptsetup debug purpose */
_public_ const char *cryptsetup_token_version(void) {
return TOKEN_VERSION_MAJOR "." TOKEN_VERSION_MINOR " systemd-v" STRINGIFY(PROJECT_VERSION) " (" GIT_VERSION ")";
}
_public_ int cryptsetup_token_open_pin(
struct crypt_device *cd, /* is always LUKS2 context */
int token /* is always >= 0 */,
const char *pin,
size_t pin_size,
char **password, /* freed by cryptsetup_token_buffer_free */
size_t *password_len,
void *usrptr /* plugin defined parameter passed to crypt_activate_by_token*() API */) {
const char *json;
int r;
assert(!pin || pin_size);
assert(token >= 0);
/* This must not fail at this moment (internal error) */
r = crypt_token_json_get(cd, token, &json);
/* Use assert_se() here to avoid emitting warning with -DNDEBUG */
assert_se(token == r);
assert(json);
return acquire_luks2_key(cd, json, usrptr, pin, pin_size, password, password_len);
}
/*
* This function is called from within following libcryptsetup calls
* provided conditions further below are met:
*
* crypt_activate_by_token(), crypt_activate_by_token_type(type == 'systemd-pkcs11'):
*
* - token is assigned to at least one luks2 keyslot eligible to activate LUKS2 device
* (alternatively: name is set to null, flags contains CRYPT_ACTIVATE_ALLOW_UNBOUND_KEY
* and token is assigned to at least single keyslot).
*
* - if plugin defines validate function (see cryptsetup_token_validate below) it must have
* passed the check (aka return 0)
*/
_public_ int cryptsetup_token_open(
struct crypt_device *cd, /* is always LUKS2 context */
int token /* is always >= 0 */,
char **password, /* freed by cryptsetup_token_buffer_free */
size_t *password_len,
void *usrptr /* plugin defined parameter passed to crypt_activate_by_token*() API */) {
return cryptsetup_token_open_pin(cd, token, NULL, 0, password, password_len, usrptr);
}
/*
* libcryptsetup callback for memory deallocation of 'password' parameter passed in
* any crypt_token_open_* plugin function
*/
_public_ void cryptsetup_token_buffer_free(void *buffer, size_t buffer_len) {
erase_and_free(buffer);
}
/*
* prints systemd-pkcs11 token content in crypt_dump().
* 'type' and 'keyslots' fields are printed by libcryptsetup
*/
_public_ void cryptsetup_token_dump(
struct crypt_device *cd /* is always LUKS2 context */,
const char *json /* validated 'systemd-pkcs11' token if cryptsetup_token_validate is defined */) {
int r;
size_t pkcs11_key_size;
_cleanup_free_ char *pkcs11_uri = NULL, *key_str = NULL;
_cleanup_free_ void *pkcs11_key = NULL;
r = parse_luks2_pkcs11_data(cd, json, &pkcs11_uri, &pkcs11_key, &pkcs11_key_size);
if (r < 0)
return (void) crypt_log_debug_errno(cd, r, "Failed to parse " TOKEN_NAME " metadata: %m.");
r = crypt_dump_buffer_to_hex_string(pkcs11_key, pkcs11_key_size, &key_str);
if (r < 0)
return (void) crypt_log_debug_errno(cd, r, "Cannot dump " TOKEN_NAME " content: %m");
crypt_log(cd, "\tpkcs11-uri: %s\n", pkcs11_uri);
crypt_log(cd, "\tpkcs11-key: %s\n", key_str);
}
/*
* Note:
* If plugin is available in library path, it's called in before following libcryptsetup calls:
*
* crypt_token_json_set, crypt_dump, any crypt_activate_by_token_* flavour
*/
_public_ int cryptsetup_token_validate(
struct crypt_device *cd, /* is always LUKS2 context */
const char *json /* contains valid 'type' and 'keyslots' fields. 'type' is 'systemd-pkcs11' */) {
int r;
JsonVariant *w;
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
r = json_parse(json, 0, &v, NULL, NULL);
if (r < 0)
return crypt_log_debug_errno(cd, r, "Could not parse " TOKEN_NAME " json object: %m.");
w = json_variant_by_key(v, "pkcs11-uri");
if (!w || !json_variant_is_string(w)) {
crypt_log_debug(cd, "PKCS#11 token data lacks 'pkcs11-uri' field.");
return 1;
}
if (!pkcs11_uri_valid(json_variant_string(w))) {
crypt_log_debug(cd, "PKCS#11 token data contains invalid PKCS#11 URI.");
return 1;
}
w = json_variant_by_key(v, "pkcs11-key");
if (!w || !json_variant_is_string(w)) {
crypt_log_debug(cd, "PKCS#11 token data lacks 'pkcs11-key' field.");
return 1;
}
r = unbase64mem(json_variant_string(w), SIZE_MAX, NULL, NULL);
if (r < 0)
return crypt_log_debug_errno(cd, r, "Failed to decode base64 encoded key: %m.");
return 0;
}
|
