| 1 | /*
|
|---|
| 2 | * Copyright 2001-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|---|
| 3 | *
|
|---|
| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
|
|---|
| 5 | * this file except in compliance with the License. You can obtain a copy
|
|---|
| 6 | * in the file LICENSE in the source distribution or at
|
|---|
| 7 | * https://www.openssl.org/source/license.html
|
|---|
| 8 | */
|
|---|
| 9 |
|
|---|
| 10 | #include "internal/cryptlib.h"
|
|---|
| 11 | #include <openssl/evp.h>
|
|---|
| 12 | #include <openssl/lhash.h>
|
|---|
| 13 | #include <openssl/trace.h>
|
|---|
| 14 | #include "eng_local.h"
|
|---|
| 15 |
|
|---|
| 16 | /* The type of the items in the table */
|
|---|
| 17 | struct st_engine_pile {
|
|---|
| 18 | /* The 'nid' of this algorithm/mode */
|
|---|
| 19 | int nid;
|
|---|
| 20 | /* ENGINEs that implement this algorithm/mode. */
|
|---|
| 21 | STACK_OF(ENGINE) *sk;
|
|---|
| 22 | /* The default ENGINE to perform this algorithm/mode. */
|
|---|
| 23 | ENGINE *funct;
|
|---|
| 24 | /*
|
|---|
| 25 | * Zero if 'sk' is newer than the cached 'funct', non-zero otherwise
|
|---|
| 26 | */
|
|---|
| 27 | int uptodate;
|
|---|
| 28 | };
|
|---|
| 29 |
|
|---|
| 30 | /* The type exposed in eng_local.h */
|
|---|
| 31 | struct st_engine_table {
|
|---|
| 32 | LHASH_OF(ENGINE_PILE) piles;
|
|---|
| 33 | }; /* ENGINE_TABLE */
|
|---|
| 34 |
|
|---|
| 35 | typedef struct st_engine_pile_doall {
|
|---|
| 36 | engine_table_doall_cb *cb;
|
|---|
| 37 | void *arg;
|
|---|
| 38 | } ENGINE_PILE_DOALL;
|
|---|
| 39 |
|
|---|
| 40 | /* Global flags (ENGINE_TABLE_FLAG_***). */
|
|---|
| 41 | static unsigned int table_flags = 0;
|
|---|
| 42 |
|
|---|
| 43 | /* API function manipulating 'table_flags' */
|
|---|
| 44 | unsigned int ENGINE_get_table_flags(void)
|
|---|
| 45 | {
|
|---|
| 46 | return table_flags;
|
|---|
| 47 | }
|
|---|
| 48 |
|
|---|
| 49 | void ENGINE_set_table_flags(unsigned int flags)
|
|---|
| 50 | {
|
|---|
| 51 | table_flags = flags;
|
|---|
| 52 | }
|
|---|
| 53 |
|
|---|
| 54 | /* Internal functions for the "piles" hash table */
|
|---|
| 55 | static unsigned long engine_pile_hash(const ENGINE_PILE *c)
|
|---|
| 56 | {
|
|---|
| 57 | return c->nid;
|
|---|
| 58 | }
|
|---|
| 59 |
|
|---|
| 60 | static int engine_pile_cmp(const ENGINE_PILE *a, const ENGINE_PILE *b)
|
|---|
| 61 | {
|
|---|
| 62 | return a->nid - b->nid;
|
|---|
| 63 | }
|
|---|
| 64 |
|
|---|
| 65 | static int int_table_check(ENGINE_TABLE **t, int create)
|
|---|
| 66 | {
|
|---|
| 67 | LHASH_OF(ENGINE_PILE) *lh;
|
|---|
| 68 |
|
|---|
| 69 | if (*t)
|
|---|
| 70 | return 1;
|
|---|
| 71 | if (!create)
|
|---|
| 72 | return 0;
|
|---|
| 73 | if ((lh = lh_ENGINE_PILE_new(engine_pile_hash, engine_pile_cmp)) == NULL)
|
|---|
| 74 | return 0;
|
|---|
| 75 | *t = (ENGINE_TABLE *)lh;
|
|---|
| 76 | return 1;
|
|---|
| 77 | }
|
|---|
| 78 |
|
|---|
| 79 | /*
|
|---|
| 80 | * Privately exposed (via eng_local.h) functions for adding and/or removing
|
|---|
| 81 | * ENGINEs from the implementation table
|
|---|
| 82 | */
|
|---|
| 83 | int engine_table_register(ENGINE_TABLE **table, ENGINE_CLEANUP_CB *cleanup,
|
|---|
| 84 | ENGINE *e, const int *nids, int num_nids,
|
|---|
| 85 | int setdefault)
|
|---|
| 86 | {
|
|---|
| 87 | int ret = 0, added = 0;
|
|---|
| 88 | ENGINE_PILE tmplate, *fnd;
|
|---|
| 89 |
|
|---|
| 90 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
|
|---|
| 91 | return 0;
|
|---|
| 92 | if (!(*table))
|
|---|
| 93 | added = 1;
|
|---|
| 94 | if (!int_table_check(table, 1))
|
|---|
| 95 | goto end;
|
|---|
| 96 | if (added)
|
|---|
| 97 | /* The cleanup callback needs to be added */
|
|---|
| 98 | engine_cleanup_add_first(cleanup);
|
|---|
| 99 | while (num_nids--) {
|
|---|
| 100 | tmplate.nid = *nids;
|
|---|
| 101 | fnd = lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate);
|
|---|
| 102 | if (!fnd) {
|
|---|
| 103 | fnd = OPENSSL_malloc(sizeof(*fnd));
|
|---|
| 104 | if (fnd == NULL)
|
|---|
| 105 | goto end;
|
|---|
| 106 | fnd->uptodate = 1;
|
|---|
| 107 | fnd->nid = *nids;
|
|---|
| 108 | fnd->sk = sk_ENGINE_new_null();
|
|---|
| 109 | if (!fnd->sk) {
|
|---|
| 110 | OPENSSL_free(fnd);
|
|---|
| 111 | goto end;
|
|---|
| 112 | }
|
|---|
| 113 | fnd->funct = NULL;
|
|---|
| 114 | (void)lh_ENGINE_PILE_insert(&(*table)->piles, fnd);
|
|---|
| 115 | if (lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate) != fnd) {
|
|---|
| 116 | sk_ENGINE_free(fnd->sk);
|
|---|
| 117 | OPENSSL_free(fnd);
|
|---|
| 118 | goto end;
|
|---|
| 119 | }
|
|---|
| 120 | }
|
|---|
| 121 | /* A registration shouldn't add duplicate entries */
|
|---|
| 122 | (void)sk_ENGINE_delete_ptr(fnd->sk, e);
|
|---|
| 123 | /*
|
|---|
| 124 | * if 'setdefault', this ENGINE goes to the head of the list
|
|---|
| 125 | */
|
|---|
| 126 | if (!sk_ENGINE_push(fnd->sk, e))
|
|---|
| 127 | goto end;
|
|---|
| 128 | /* "touch" this ENGINE_PILE */
|
|---|
| 129 | fnd->uptodate = 0;
|
|---|
| 130 | if (setdefault) {
|
|---|
| 131 | if (!engine_unlocked_init(e)) {
|
|---|
| 132 | ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INIT_FAILED);
|
|---|
| 133 | goto end;
|
|---|
| 134 | }
|
|---|
| 135 | if (fnd->funct)
|
|---|
| 136 | engine_unlocked_finish(fnd->funct, 0);
|
|---|
| 137 | fnd->funct = e;
|
|---|
| 138 | fnd->uptodate = 1;
|
|---|
| 139 | }
|
|---|
| 140 | nids++;
|
|---|
| 141 | }
|
|---|
| 142 | ret = 1;
|
|---|
| 143 | end:
|
|---|
| 144 | CRYPTO_THREAD_unlock(global_engine_lock);
|
|---|
| 145 | return ret;
|
|---|
| 146 | }
|
|---|
| 147 |
|
|---|
| 148 | static void int_unregister_cb(ENGINE_PILE *pile, ENGINE *e)
|
|---|
| 149 | {
|
|---|
| 150 | int n;
|
|---|
| 151 | /* Iterate the 'c->sk' stack removing any occurrence of 'e' */
|
|---|
| 152 | while ((n = sk_ENGINE_find(pile->sk, e)) >= 0) {
|
|---|
| 153 | (void)sk_ENGINE_delete(pile->sk, n);
|
|---|
| 154 | pile->uptodate = 0;
|
|---|
| 155 | }
|
|---|
| 156 | if (pile->funct == e) {
|
|---|
| 157 | engine_unlocked_finish(e, 0);
|
|---|
| 158 | pile->funct = NULL;
|
|---|
| 159 | }
|
|---|
| 160 | }
|
|---|
| 161 |
|
|---|
| 162 | IMPLEMENT_LHASH_DOALL_ARG(ENGINE_PILE, ENGINE);
|
|---|
| 163 |
|
|---|
| 164 | void engine_table_unregister(ENGINE_TABLE **table, ENGINE *e)
|
|---|
| 165 | {
|
|---|
| 166 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
|
|---|
| 167 | /* Can't return a value. :( */
|
|---|
| 168 | return;
|
|---|
| 169 | if (int_table_check(table, 0))
|
|---|
| 170 | lh_ENGINE_PILE_doall_ENGINE(&(*table)->piles, int_unregister_cb, e);
|
|---|
| 171 | CRYPTO_THREAD_unlock(global_engine_lock);
|
|---|
| 172 | }
|
|---|
| 173 |
|
|---|
| 174 | static void int_cleanup_cb_doall(ENGINE_PILE *p)
|
|---|
| 175 | {
|
|---|
| 176 | if (p == NULL)
|
|---|
| 177 | return;
|
|---|
| 178 | sk_ENGINE_free(p->sk);
|
|---|
| 179 | if (p->funct)
|
|---|
| 180 | engine_unlocked_finish(p->funct, 0);
|
|---|
| 181 | OPENSSL_free(p);
|
|---|
| 182 | }
|
|---|
| 183 |
|
|---|
| 184 | void engine_table_cleanup(ENGINE_TABLE **table)
|
|---|
| 185 | {
|
|---|
| 186 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
|
|---|
| 187 | return;
|
|---|
| 188 | if (*table) {
|
|---|
| 189 | lh_ENGINE_PILE_doall(&(*table)->piles, int_cleanup_cb_doall);
|
|---|
| 190 | lh_ENGINE_PILE_free(&(*table)->piles);
|
|---|
| 191 | *table = NULL;
|
|---|
| 192 | }
|
|---|
| 193 | CRYPTO_THREAD_unlock(global_engine_lock);
|
|---|
| 194 | }
|
|---|
| 195 |
|
|---|
| 196 | /* return a functional reference for a given 'nid' */
|
|---|
| 197 | ENGINE *ossl_engine_table_select(ENGINE_TABLE **table, int nid,
|
|---|
| 198 | const char *f, int l)
|
|---|
| 199 | {
|
|---|
| 200 | ENGINE *ret = NULL;
|
|---|
| 201 | ENGINE_PILE tmplate, *fnd = NULL;
|
|---|
| 202 | int initres, loop = 0;
|
|---|
| 203 |
|
|---|
| 204 | /* Load the config before trying to check if engines are available */
|
|---|
| 205 | OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CONFIG, NULL);
|
|---|
| 206 |
|
|---|
| 207 | if (!(*table)) {
|
|---|
| 208 | OSSL_TRACE3(ENGINE_TABLE,
|
|---|
| 209 | "%s:%d, nid=%d, nothing registered!\n",
|
|---|
| 210 | f, l, nid);
|
|---|
| 211 | return NULL;
|
|---|
| 212 | }
|
|---|
| 213 | ERR_set_mark();
|
|---|
| 214 | if (!CRYPTO_THREAD_write_lock(global_engine_lock))
|
|---|
| 215 | goto end;
|
|---|
| 216 | /*
|
|---|
| 217 | * Check again inside the lock otherwise we could race against cleanup
|
|---|
| 218 | * operations. But don't worry about a debug printout
|
|---|
| 219 | */
|
|---|
| 220 | if (!int_table_check(table, 0))
|
|---|
| 221 | goto end;
|
|---|
| 222 | tmplate.nid = nid;
|
|---|
| 223 | fnd = lh_ENGINE_PILE_retrieve(&(*table)->piles, &tmplate);
|
|---|
| 224 | if (!fnd)
|
|---|
| 225 | goto end;
|
|---|
| 226 | if (fnd->funct && engine_unlocked_init(fnd->funct)) {
|
|---|
| 227 | OSSL_TRACE4(ENGINE_TABLE,
|
|---|
| 228 | "%s:%d, nid=%d, using ENGINE '%s' cached\n",
|
|---|
| 229 | f, l, nid, fnd->funct->id);
|
|---|
| 230 | ret = fnd->funct;
|
|---|
| 231 | goto end;
|
|---|
| 232 | }
|
|---|
| 233 | if (fnd->uptodate) {
|
|---|
| 234 | ret = fnd->funct;
|
|---|
| 235 | goto end;
|
|---|
| 236 | }
|
|---|
| 237 | trynext:
|
|---|
| 238 | ret = sk_ENGINE_value(fnd->sk, loop++);
|
|---|
| 239 | if (!ret) {
|
|---|
| 240 | OSSL_TRACE3(ENGINE_TABLE,
|
|---|
| 241 | "%s:%d, nid=%d, "
|
|---|
| 242 | "no registered implementations would initialise\n",
|
|---|
| 243 | f, l, nid);
|
|---|
| 244 | goto end;
|
|---|
| 245 | }
|
|---|
| 246 | /* Try to initialise the ENGINE? */
|
|---|
| 247 | if ((ret->funct_ref > 0) || !(table_flags & ENGINE_TABLE_FLAG_NOINIT))
|
|---|
| 248 | initres = engine_unlocked_init(ret);
|
|---|
| 249 | else
|
|---|
| 250 | initres = 0;
|
|---|
| 251 | if (initres) {
|
|---|
| 252 | /* Update 'funct' */
|
|---|
| 253 | if ((fnd->funct != ret) && engine_unlocked_init(ret)) {
|
|---|
| 254 | /* If there was a previous default we release it. */
|
|---|
| 255 | if (fnd->funct)
|
|---|
| 256 | engine_unlocked_finish(fnd->funct, 0);
|
|---|
| 257 | fnd->funct = ret;
|
|---|
| 258 | OSSL_TRACE4(ENGINE_TABLE,
|
|---|
| 259 | "%s:%d, nid=%d, setting default to '%s'\n",
|
|---|
| 260 | f, l, nid, ret->id);
|
|---|
| 261 | }
|
|---|
| 262 | OSSL_TRACE4(ENGINE_TABLE,
|
|---|
| 263 | "%s:%d, nid=%d, using newly initialised '%s'\n",
|
|---|
| 264 | f, l, nid, ret->id);
|
|---|
| 265 | goto end;
|
|---|
| 266 | }
|
|---|
| 267 | goto trynext;
|
|---|
| 268 | end:
|
|---|
| 269 | /*
|
|---|
| 270 | * If it failed, it is unlikely to succeed again until some future
|
|---|
| 271 | * registrations have taken place. In all cases, we cache.
|
|---|
| 272 | */
|
|---|
| 273 | if (fnd)
|
|---|
| 274 | fnd->uptodate = 1;
|
|---|
| 275 | if (ret)
|
|---|
| 276 | OSSL_TRACE4(ENGINE_TABLE,
|
|---|
| 277 | "%s:%d, nid=%d, caching ENGINE '%s'\n",
|
|---|
| 278 | f, l, nid, ret->id);
|
|---|
| 279 | else
|
|---|
| 280 | OSSL_TRACE3(ENGINE_TABLE,
|
|---|
| 281 | "%s:%d, nid=%d, caching 'no matching ENGINE'\n",
|
|---|
| 282 | f, l, nid);
|
|---|
| 283 | CRYPTO_THREAD_unlock(global_engine_lock);
|
|---|
| 284 | /*
|
|---|
| 285 | * Whatever happened, any failed init()s are not failures in this
|
|---|
| 286 | * context, so clear our error state.
|
|---|
| 287 | */
|
|---|
| 288 | ERR_pop_to_mark();
|
|---|
| 289 | return ret;
|
|---|
| 290 | }
|
|---|
| 291 |
|
|---|
| 292 | /* Table enumeration */
|
|---|
| 293 |
|
|---|
| 294 | static void int_dall(const ENGINE_PILE *pile, ENGINE_PILE_DOALL *dall)
|
|---|
| 295 | {
|
|---|
| 296 | dall->cb(pile->nid, pile->sk, pile->funct, dall->arg);
|
|---|
| 297 | }
|
|---|
| 298 |
|
|---|
| 299 | IMPLEMENT_LHASH_DOALL_ARG_CONST(ENGINE_PILE, ENGINE_PILE_DOALL);
|
|---|
| 300 |
|
|---|
| 301 | void engine_table_doall(ENGINE_TABLE *table, engine_table_doall_cb *cb,
|
|---|
| 302 | void *arg)
|
|---|
| 303 | {
|
|---|
| 304 | ENGINE_PILE_DOALL dall;
|
|---|
| 305 | dall.cb = cb;
|
|---|
| 306 | dall.arg = arg;
|
|---|
| 307 | if (table)
|
|---|
| 308 | lh_ENGINE_PILE_doall_ENGINE_PILE_DOALL(&table->piles, int_dall, &dall);
|
|---|
| 309 | }
|
|---|
