summaryrefslogtreecommitdiffstats
path: root/crypto/engine/eng_lib.c
blob: d0bc716bb3cd67f12b4f5a6439d57e6814f3beff (plain)
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
/*
 * Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL project
 * 2000.
 */
/* ====================================================================
 * Copyright (c) 1999-2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "eng_int.h"
#include <openssl/rand.h>

CRYPTO_RWLOCK *global_engine_lock;

CRYPTO_ONCE engine_lock_init = CRYPTO_ONCE_STATIC_INIT;

/* The "new"/"free" stuff first */

void do_engine_lock_init(void)
{
    global_engine_lock = CRYPTO_THREAD_lock_new();
}

ENGINE *ENGINE_new(void)
{
    ENGINE *ret;

    CRYPTO_THREAD_run_once(&engine_lock_init, do_engine_lock_init);

    ret = OPENSSL_zalloc(sizeof(*ret));
    if (ret == NULL) {
        ENGINEerr(ENGINE_F_ENGINE_NEW, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
    ret->struct_ref = 1;
    engine_ref_debug(ret, 0, 1);
    CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data);
    return ret;
}

/*
 * Placed here (close proximity to ENGINE_new) so that modifications to the
 * elements of the ENGINE structure are more likely to be caught and changed
 * here.
 */
void engine_set_all_null(ENGINE *e)
{
    e->id = NULL;
    e->name = NULL;
    e->rsa_meth = NULL;
    e->dsa_meth = NULL;
    e->dh_meth = NULL;
    e->rand_meth = NULL;
    e->ciphers = NULL;
    e->digests = NULL;
    e->destroy = NULL;
    e->init = NULL;
    e->finish = NULL;
    e->ctrl = NULL;
    e->load_privkey = NULL;
    e->load_pubkey = NULL;
    e->cmd_defns = NULL;
    e->flags = 0;
}

int engine_free_util(ENGINE *e, int locked)
{
    int i;

    if (e == NULL)
        return 1;
    if (locked)
        CRYPTO_atomic_add(&e->struct_ref, -1, &i, global_engine_lock);
    else
        i = --e->struct_ref;
    engine_ref_debug(e, 0, -1)
    if (i > 0)
        return 1;
    REF_ASSERT_ISNT(i < 0);
    /* Free up any dynamically allocated public key methods */
    engine_pkey_meths_free(e);
    engine_pkey_asn1_meths_free(e);
    /*
     * Give the ENGINE a chance to do any structural cleanup corresponding to
     * allocation it did in its constructor (eg. unload error strings)
     */
    if (e->destroy)
        e->destroy(e);
    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ENGINE, e, &e->ex_data);
    OPENSSL_free(e);
    return 1;
}

int ENGINE_free(ENGINE *e)
{
    return engine_free_util(e, 1);
}

/* Cleanup stuff */

/*
 * engine_cleanup_int() is coded such that anything that does work that will
 * need cleanup can register a "cleanup" callback here. That way we don't get
 * linker bloat by referring to all *possible* cleanups, but any linker bloat
 * into code "X" will cause X's cleanup function to end up here.
 */
static STACK_OF(ENGINE_CLEANUP_ITEM) *cleanup_stack = NULL;
static int int_cleanup_check(int create)
{
    if (cleanup_stack)
        return 1;
    if (!create)
        return 0;
    cleanup_stack = sk_ENGINE_CLEANUP_ITEM_new_null();
    return (cleanup_stack ? 1 : 0);
}

static ENGINE_CLEANUP_ITEM *int_cleanup_item(ENGINE_CLEANUP_CB *cb)
{
    ENGINE_CLEANUP_ITEM *item = OPENSSL_malloc(sizeof(*item));
    if (item == NULL)
        return NULL;
    item->cb = cb;
    return item;
}

void engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb)
{
    ENGINE_CLEANUP_ITEM *item;
    if (!int_cleanup_check(1))
        return;
    item = int_cleanup_item(cb);
    if (item)
        sk_ENGINE_CLEANUP_ITEM_insert(cleanup_stack, item, 0);
}

void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb)
{
    ENGINE_CLEANUP_ITEM *item;
    if (!int_cleanup_check(1))
        return;
    item = int_cleanup_item(cb);
    if (item)
        sk_ENGINE_CLEANUP_ITEM_push(cleanup_stack, item);
}

/* The API function that performs all cleanup */
static void engine_cleanup_cb_free(ENGINE_CLEANUP_ITEM *item)
{
    (*(item->cb)) ();
    OPENSSL_free(item);
}

void engine_cleanup_int(void)
{
    if (int_cleanup_check(0)) {
        sk_ENGINE_CLEANUP_ITEM_pop_free(cleanup_stack,
                                        engine_cleanup_cb_free);
        cleanup_stack = NULL;
    }
    /*
     * FIXME: This should be handled (somehow) through RAND, eg. by it
     * registering a cleanup callback.
     */
    RAND_set_rand_method(NULL);
    CRYPTO_THREAD_lock_free(global_engine_lock);
}

/* Now the "ex_data" support */

int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg)
{
    return (CRYPTO_set_ex_data(&e->ex_data, idx, arg));
}

void *ENGINE_get_ex_data(const ENGINE *e, int idx)
{
    return (CRYPTO_get_ex_data(&e->ex_data, idx));
}

/*
 * Functions to get/set an ENGINE's elements - mainly to avoid exposing the
 * ENGINE structure itself.
 */

int ENGINE_set_id(ENGINE *e, const char *id)
{
    if (id == NULL) {
        ENGINEerr(ENGINE_F_ENGINE_SET_ID, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    e->id = id;
    return 1;
}

int ENGINE_set_name(ENGINE *e, const char *name)
{
    if (name == NULL) {
        ENGINEerr(ENGINE_F_ENGINE_SET_NAME, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    e->name = name;
    return 1;
}

int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f)
{
    e->destroy = destroy_f;
    return 1;
}

int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f)
{
    e->init = init_f;
    return 1;
}

int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f)
{
    e->finish = finish_f;
    return 1;
}

int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f)
{
    e->ctrl = ctrl_f;
    return 1;
}

int ENGINE_set_flags(ENGINE *e, int flags)
{
    e->flags = flags;
    return 1;
}

int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns)
{
    e->cmd_defns = defns;
    return 1;
}

const char *ENGINE_get_id(const ENGINE *e)
{
    return e->id;
}

const char *ENGINE_get_name(const ENGINE *e)
{
    return e->name;
}

ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e)
{
    return e->destroy;
}

ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e)
{
    return e->init;
}

ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e)
{
    return e->finish;
}

ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e)
{
    return e->ctrl;
}

int ENGINE_get_flags(const ENGINE *e)
{
    return e->flags;
}

const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e)
{
    return e->cmd_defns;
}

/*
 * eng_lib.o is pretty much linked into anything that touches ENGINE already,
 * so put the "static_state" hack here.
 */

static int internal_static_hack = 0;

void *ENGINE_get_static_state(void)
{
    return &internal_static_hack;
}