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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "errno-util.h"
#include "format-table.h"
#include "hexdecoct.h"
#include "homectl-pkcs11.h"
#include "libcrypt-util.h"
#include "memory-util.h"
#include "openssl-util.h"
#include "pkcs11-util.h"
#include "strv.h"
int identity_add_token_pin(JsonVariant **v, const char *pin) {
_cleanup_(json_variant_unrefp) JsonVariant *w = NULL, *l = NULL;
_cleanup_strv_free_erase_ char **pins = NULL;
int r;
assert(v);
if (isempty(pin))
return 0;
w = json_variant_ref(json_variant_by_key(*v, "secret"));
l = json_variant_ref(json_variant_by_key(w, "tokenPin"));
r = json_variant_strv(l, &pins);
if (r < 0)
return log_error_errno(r, "Failed to convert PIN array: %m");
if (strv_contains(pins, pin))
return 0;
r = strv_extend(&pins, pin);
if (r < 0)
return log_oom();
strv_uniq(pins);
l = json_variant_unref(l);
r = json_variant_new_array_strv(&l, pins);
if (r < 0)
return log_error_errno(r, "Failed to allocate new PIN array JSON: %m");
json_variant_sensitive(l);
r = json_variant_set_field(&w, "tokenPin", l);
if (r < 0)
return log_error_errno(r, "Failed to update PIN field: %m");
r = json_variant_set_field(v, "secret", w);
if (r < 0)
return log_error_errno(r, "Failed to update secret object: %m");
return 1;
}
#if HAVE_P11KIT
static int add_pkcs11_token_uri(JsonVariant **v, const char *uri) {
_cleanup_(json_variant_unrefp) JsonVariant *w = NULL;
_cleanup_strv_free_ char **l = NULL;
int r;
assert(v);
assert(uri);
w = json_variant_ref(json_variant_by_key(*v, "pkcs11TokenUri"));
if (w) {
r = json_variant_strv(w, &l);
if (r < 0)
return log_error_errno(r, "Failed to parse PKCS#11 token list: %m");
if (strv_contains(l, uri))
return 0;
}
r = strv_extend(&l, uri);
if (r < 0)
return log_oom();
w = json_variant_unref(w);
r = json_variant_new_array_strv(&w, l);
if (r < 0)
return log_error_errno(r, "Failed to create PKCS#11 token URI JSON: %m");
r = json_variant_set_field(v, "pkcs11TokenUri", w);
if (r < 0)
return log_error_errno(r, "Failed to update PKCS#11 token URI list: %m");
return 0;
}
static int add_pkcs11_encrypted_key(
JsonVariant **v,
const char *uri,
const void *encrypted_key, size_t encrypted_key_size,
const void *decrypted_key, size_t decrypted_key_size) {
_cleanup_(json_variant_unrefp) JsonVariant *l = NULL, *w = NULL, *e = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL, *hashed = NULL;
ssize_t base64_encoded_size;
int r;
assert(v);
assert(uri);
assert(encrypted_key);
assert(encrypted_key_size > 0);
assert(decrypted_key);
assert(decrypted_key_size > 0);
/* 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(decrypted_key, decrypted_key_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 = json_build(&e, JSON_BUILD_OBJECT(
JSON_BUILD_PAIR("uri", JSON_BUILD_STRING(uri)),
JSON_BUILD_PAIR("data", JSON_BUILD_BASE64(encrypted_key, encrypted_key_size)),
JSON_BUILD_PAIR("hashedPassword", JSON_BUILD_STRING(hashed))));
if (r < 0)
return log_error_errno(r, "Failed to build encrypted JSON key object: %m");
w = json_variant_ref(json_variant_by_key(*v, "privileged"));
l = json_variant_ref(json_variant_by_key(w, "pkcs11EncryptedKey"));
r = json_variant_append_array(&l, e);
if (r < 0)
return log_error_errno(r, "Failed append PKCS#11 encrypted key: %m");
r = json_variant_set_field(&w, "pkcs11EncryptedKey", l);
if (r < 0)
return log_error_errno(r, "Failed to set PKCS#11 encrypted key: %m");
r = json_variant_set_field(v, "privileged", w);
if (r < 0)
return log_error_errno(r, "Failed to update privileged field: %m");
return 0;
}
int identity_add_pkcs11_key_data(JsonVariant **v, const char *uri) {
_cleanup_(erase_and_freep) void *decrypted_key = NULL, *saved_key = NULL;
_cleanup_(erase_and_freep) char *pin = NULL;
size_t decrypted_key_size, saved_key_size;
_cleanup_(EVP_PKEY_freep) EVP_PKEY *pkey = NULL;
int r;
assert(v);
r = pkcs11_acquire_public_key(
uri,
"home directory operation",
"user-home",
"home.token-pin",
/* askpw_flags= */ 0,
&pkey,
&pin);
if (r < 0)
return r;
r = pkey_generate_volume_keys(pkey, &decrypted_key, &decrypted_key_size, &saved_key, &saved_key_size);
if (r < 0)
return log_error_errno(r, "Failed to generate volume keys: %m");
/* Add the token URI to the public part of the record. */
r = add_pkcs11_token_uri(v, uri);
if (r < 0)
return r;
/* Include the encrypted version of the random key we just generated in the privileged part of the record */
r = add_pkcs11_encrypted_key(
v,
uri,
saved_key, saved_key_size,
decrypted_key, decrypted_key_size);
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, pin);
if (r < 0)
return r;
return 0;
}
#endif
|
