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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
|
/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/core_names.h>
#include <openssl/core_object.h>
#include <openssl/evp.h>
#include <openssl/ui.h>
#include <openssl/decoder.h>
#include <openssl/safestack.h>
#include "crypto/evp.h"
#include "crypto/decoder.h"
#include "encoder_local.h"
int OSSL_DECODER_CTX_set_passphrase(OSSL_DECODER_CTX *ctx,
const unsigned char *kstr,
size_t klen)
{
return ossl_pw_set_passphrase(&ctx->pwdata, kstr, klen);
}
int OSSL_DECODER_CTX_set_passphrase_ui(OSSL_DECODER_CTX *ctx,
const UI_METHOD *ui_method,
void *ui_data)
{
return ossl_pw_set_ui_method(&ctx->pwdata, ui_method, ui_data);
}
int OSSL_DECODER_CTX_set_pem_password_cb(OSSL_DECODER_CTX *ctx,
pem_password_cb *cb, void *cbarg)
{
return ossl_pw_set_pem_password_cb(&ctx->pwdata, cb, cbarg);
}
int OSSL_DECODER_CTX_set_passphrase_cb(OSSL_DECODER_CTX *ctx,
OSSL_PASSPHRASE_CALLBACK *cb,
void *cbarg)
{
return ossl_pw_set_ossl_passphrase_cb(&ctx->pwdata, cb, cbarg);
}
/*
* Support for OSSL_DECODER_CTX_new_by_EVP_PKEY:
* The construct data, and collecting keymgmt information for it
*/
DEFINE_STACK_OF(EVP_KEYMGMT)
struct decoder_EVP_PKEY_data_st {
char *object_type; /* recorded object data type, may be NULL */
void **object; /* Where the result should end up */
STACK_OF(EVP_KEYMGMT) *keymgmts; /* The EVP_KEYMGMTs we handle */
};
static int decoder_construct_EVP_PKEY(OSSL_DECODER_INSTANCE *decoder_inst,
const OSSL_PARAM *params,
void *construct_data)
{
struct decoder_EVP_PKEY_data_st *data = construct_data;
OSSL_DECODER *decoder =
OSSL_DECODER_INSTANCE_decoder(decoder_inst);
void *decoderctx = OSSL_DECODER_INSTANCE_decoder_ctx(decoder_inst);
size_t i, end_i;
/*
* |object_ref| points to a provider reference to an object, its exact
* contents entirely opaque to us, but may be passed to any provider
* function that expects this (such as OSSL_FUNC_keymgmt_load().
*
* This pointer is considered volatile, i.e. whatever it points at
* is assumed to be freed as soon as this function returns.
*/
void *object_ref = NULL;
size_t object_ref_sz = 0;
const OSSL_PARAM *p;
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_DATA_TYPE);
if (p != NULL) {
char *object_type = NULL;
if (!OSSL_PARAM_get_utf8_string(p, &object_type, 0))
return 0;
OPENSSL_free(data->object_type);
data->object_type = object_type;
}
/*
* For stuff that should end up in an EVP_PKEY, we only accept an object
* reference for the moment. This enforces that the key data itself
* remains with the provider.
*/
p = OSSL_PARAM_locate_const(params, OSSL_OBJECT_PARAM_REFERENCE);
if (p == NULL || p->data_type != OSSL_PARAM_OCTET_STRING)
return 0;
object_ref = p->data;
object_ref_sz = p->data_size;
/* We may have reached one of the goals, let's find out! */
end_i = sk_EVP_KEYMGMT_num(data->keymgmts);
for (i = 0; end_i; i++) {
EVP_KEYMGMT *keymgmt = sk_EVP_KEYMGMT_value(data->keymgmts, i);
/*
* There are two ways to find a matching KEYMGMT:
*
* 1. If the object data type (recorded in |data->object_type|)
* is defined, by checking it using EVP_KEYMGMT_is_a().
* 2. If the object data type is NOT defined, by comparing the
* EVP_KEYMGMT and OSSL_DECODER method numbers. Since
* EVP_KEYMGMT and OSSL_DECODE operate with the same
* namemap, we know that the method numbers must match.
*
* This allows individual decoders to specify variants of keys,
* such as a DER to RSA decoder finding a RSA-PSS key, without
* having to decode the exact same DER blob into the exact same
* internal structure twice. This is, of course, entirely at the
* discretion of the decoder implementations.
*/
if (data->object_type != NULL
? EVP_KEYMGMT_is_a(keymgmt, data->object_type)
: EVP_KEYMGMT_number(keymgmt) == OSSL_DECODER_number(decoder)) {
EVP_PKEY *pkey = NULL;
void *keydata = NULL;
const OSSL_PROVIDER *keymgmt_prov =
EVP_KEYMGMT_provider(keymgmt);
const OSSL_PROVIDER *decoder_prov =
OSSL_DECODER_provider(decoder);
/*
* If the EVP_KEYMGMT and the OSSL_DECODER are from the
* same provider, we assume that the KEYMGMT has a key loading
* function that can handle the provider reference we hold.
*
* Otherwise, we export from the decoder and import the
* result in the keymgmt.
*/
if (keymgmt_prov == decoder_prov) {
keydata = evp_keymgmt_load(keymgmt, object_ref, object_ref_sz);
} else {
struct evp_keymgmt_util_try_import_data_st import_data;
import_data.keymgmt = keymgmt;
import_data.keydata = NULL;
import_data.selection = OSSL_KEYMGMT_SELECT_ALL;
/*
* No need to check for errors here, the value of
* |import_data.keydata| is as much an indicator.
*/
(void)decoder->export_object(decoderctx,
object_ref, object_ref_sz,
&evp_keymgmt_util_try_import,
&import_data);
keydata = import_data.keydata;
import_data.keydata = NULL;
}
if (keydata != NULL
&& (pkey =
evp_keymgmt_util_make_pkey(keymgmt, keydata)) == NULL)
evp_keymgmt_freedata(keymgmt, keydata);
*data->object = pkey;
break;
}
}
/*
* We successfully looked through, |*ctx->object| determines if we
* actually found something.
*/
return (*data->object != NULL);
}
static void decoder_clean_EVP_PKEY_construct_arg(void *construct_data)
{
struct decoder_EVP_PKEY_data_st *data = construct_data;
if (data != NULL) {
sk_EVP_KEYMGMT_pop_free(data->keymgmts, EVP_KEYMGMT_free);
OPENSSL_free(data->object_type);
OPENSSL_free(data);
}
}
struct collected_data_st {
struct decoder_EVP_PKEY_data_st *process_data;
STACK_OF(OPENSSL_CSTRING) *names;
OSSL_DECODER_CTX *ctx;
unsigned int error_occured:1;
};
static void collect_keymgmt(EVP_KEYMGMT *keymgmt, void *arg)
{
struct collected_data_st *data = arg;
if (data->error_occured)
return;
data->error_occured = 1; /* Assume the worst */
if (!EVP_KEYMGMT_up_ref(keymgmt) /* ref++ */)
return;
if (sk_EVP_KEYMGMT_push(data->process_data->keymgmts, keymgmt) <= 0) {
EVP_KEYMGMT_free(keymgmt); /* ref-- */
return;
}
data->error_occured = 0; /* All is good now */
}
static void collect_name(const char *name, void *arg)
{
struct collected_data_st *data = arg;
if (data->error_occured)
return;
data->error_occured = 1; /* Assume the worst */
if (sk_OPENSSL_CSTRING_push(data->names, name) <= 0)
return;
data->error_occured = 0; /* All is good now */
}
static void collect_decoder(OSSL_DECODER *decoder, void *arg)
{
struct collected_data_st *data = arg;
size_t i, end_i;
if (data->error_occured)
return;
data->error_occured = 1; /* Assume the worst */
if (data->names == NULL)
return;
end_i = sk_OPENSSL_CSTRING_num(data->names);
for (i = 0; i < end_i; i++) {
const char *name = sk_OPENSSL_CSTRING_value(data->names, i);
if (!OSSL_DECODER_is_a(decoder, name))
continue;
(void)OSSL_DECODER_CTX_add_decoder(data->ctx, decoder);
}
data->error_occured = 0; /* All is good now */
}
int ossl_decoder_ctx_setup_for_EVP_PKEY(OSSL_DECODER_CTX *ctx,
EVP_PKEY **pkey,
OPENSSL_CTX *libctx,
const char *propquery)
{
struct collected_data_st *data = NULL;
size_t i, end_i;
int ok = 0;
if ((data = OPENSSL_zalloc(sizeof(*data))) == NULL
|| (data->process_data =
OPENSSL_zalloc(sizeof(*data->process_data))) == NULL
|| (data->process_data->keymgmts
= sk_EVP_KEYMGMT_new_null()) == NULL
|| (data->names = sk_OPENSSL_CSTRING_new_null()) == NULL) {
ERR_raise(ERR_LIB_OSSL_DECODER, ERR_R_MALLOC_FAILURE);
goto err;
|