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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#if HAVE_LIBFIDO2
#include <fido.h>
#endif
#include "ask-password-api.h"
#include "errno-util.h"
#include "format-table.h"
#include "hexdecoct.h"
#include "homectl-fido2.h"
#include "homectl-pkcs11.h"
#include "libcrypt-util.h"
#include "libfido2-util.h"
#include "locale-util.h"
#include "memory-util.h"
#include "random-util.h"
#include "strv.h"
#if HAVE_LIBFIDO2
static int add_fido2_credential_id(
sd_json_variant **v,
const void *cid,
size_t cid_size) {
_cleanup_(sd_json_variant_unrefp) sd_json_variant *w = NULL;
_cleanup_strv_free_ char **l = NULL;
_cleanup_free_ char *escaped = NULL;
ssize_t escaped_size;
int r;
assert(v);
assert(cid);
escaped_size = base64mem(cid, cid_size, &escaped);
if (escaped_size < 0)
return log_error_errno(escaped_size, "Failed to base64 encode FIDO2 credential ID: %m");
w = sd_json_variant_ref(sd_json_variant_by_key(*v, "fido2HmacCredential"));
if (w) {
r = sd_json_variant_strv(w, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse FIDO2 credential ID list: %m");
if (strv_contains(l, escaped))
return 0;
}
r = strv_extend(&l, escaped);
if (r < 0)
return log_oom();
w = sd_json_variant_unref(w);
r = sd_json_variant_new_array_strv(&w, l);
if (r < 0)
return log_error_errno(r, "Failed to create FIDO2 credential ID JSON: %m");
r = sd_json_variant_set_field(v, "fido2HmacCredential", w);
if (r < 0)
return log_error_errno(r, "Failed to update FIDO2 credential ID: %m");
return 0;
}
static int add_fido2_salt(
sd_json_variant **v,
const void *cid,
size_t cid_size,
const void *fido2_salt,
size_t fido2_salt_size,
const void *secret,
size_t secret_size,
Fido2EnrollFlags lock_with) {
_cleanup_(sd_json_variant_unrefp) sd_json_variant *l = NULL, *w = NULL, *e = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL;
ssize_t base64_encoded_size;
int r;
/* Before using UNIX hashing on the supplied key we base64 encode it, since crypt_r() and friends
* expect a NUL terminated string, and we use a binary key */
base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
if (base64_encoded_size < 0)
return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = hash_password(base64_encoded, &hashed);
if (r < 0)
return log_error_errno(errno_or_else(EINVAL), "Failed to UNIX hash secret key: %m");
r = sd_json_build(&e, SD_JSON_BUILD_OBJECT(
SD_JSON_BUILD_PAIR("credential", SD_JSON_BUILD_BASE64(cid, cid_size)),
SD_JSON_BUILD_PAIR("salt", SD_JSON_BUILD_BASE64(fido2_salt, fido2_salt_size)),
SD_JSON_BUILD_PAIR("hashedPassword", SD_JSON_BUILD_STRING(hashed)),
SD_JSON_BUILD_PAIR("up", SD_JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UP))),
SD_JSON_BUILD_PAIR("uv", SD_JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_UV))),
SD_JSON_BUILD_PAIR("clientPin", SD_JSON_BUILD_BOOLEAN(FLAGS_SET(lock_with, FIDO2ENROLL_PIN)))));
if (r < 0)
return log_error_errno(r, "Failed to build FIDO2 salt JSON key object: %m");
w = sd_json_variant_ref(sd_json_variant_by_key(*v, "privileged"));
l = sd_json_variant_ref(sd_json_variant_by_key(w, "fido2HmacSalt"));
r = sd_json_variant_append_array(&l, e);
if (r < 0)
return log_error_errno(r, "Failed append FIDO2 salt: %m");
r = sd_json_variant_set_field(&w, "fido2HmacSalt", l);
if (r < 0)
return log_error_errno(r, "Failed to set FDO2 salt: %m");
r = sd_json_variant_set_field(v, "privileged", w);
if (r < 0)
return log_error_errno(r, "Failed to update privileged field: %m");
return 0;
}
#endif
int identity_add_fido2_parameters(
sd_json_variant **v,
const char *device,
Fido2EnrollFlags lock_with,
int cred_alg) {
#if HAVE_LIBFIDO2
sd_json_variant *un, *realm, *rn;
_cleanup_(erase_and_freep) void *secret = NULL, *salt = NULL;
_cleanup_(erase_and_freep) char *used_pin = NULL;
size_t cid_size, salt_size, secret_size;
_cleanup_free_ void *cid = NULL;
const char *fido_un;
int r;
assert(v);
assert(device);
un = sd_json_variant_by_key(*v, "userName");
if (!un)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"userName field of user record is missing");
if (!sd_json_variant_is_string(un))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"userName field of user record is not a string");
realm = sd_json_variant_by_key(*v, "realm");
if (realm) {
if (!sd_json_variant_is_string(realm))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"realm field of user record is not a string");
fido_un = strjoina(sd_json_variant_string(un), sd_json_variant_string(realm));
} else
fido_un = sd_json_variant_string(un);
rn = sd_json_variant_by_key(*v, "realName");
if (rn && !sd_json_variant_is_string(rn))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"realName field of user record is not a string");
r = fido2_generate_hmac_hash(
device,
/* rp_id= */ "io.systemd.home",
/* rp_name= */ "Home Directory",
/* user_id= */ fido_un, strlen(fido_un), /* We pass the user ID and name as the same */
/* user_name= */ fido_un,
/* user_display_name= */ rn ? sd_json_variant_string(rn) : NULL,
/* user_icon_name= */ NULL,
/* askpw_icon_name= */ "user-home",
/* askpw_credential= */ "home.token-pin",
lock_with,
cred_alg,
&cid, &cid_size,
&salt, &salt_size,
&secret, &secret_size,
&used_pin,
&lock_with);
if (r < 0)
return r;
r = add_fido2_credential_id(
v,
cid,
cid_size);
if (r < 0)
return r;
r = add_fido2_salt(
v,
cid,
cid_size,
salt,
salt_size,
secret,
secret_size,
lock_with);
if (r < 0)
return r;
/* If we acquired the PIN also include it in the secret section of the record, so that systemd-homed
* can use it if it needs to, given that it likely needs to decrypt the key again to pass to LUKS or
* fscrypt. */
r = identity_add_token_pin(v, used_pin);
if (r < 0)
return r;
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"FIDO2 tokens not supported on this build.");
#endif
}
|
