crypto/engine/eng_lib.c

   1 /*
   2  * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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 "e_os.h"
  11 #include "eng_int.h"
  12 #include <openssl/rand.h>
  13 #include "internal/refcount.h"
  14
  15 CRYPTO_RWLOCK *global_engine_lock;
  16
  17 CRYPTO_ONCE engine_lock_init = CRYPTO_ONCE_STATIC_INIT;
  18
  19 /* The "new"/"free" stuff first */
  20
  21 DEFINE_RUN_ONCE(do_engine_lock_init)
  22 {
  23     if (!OPENSSL_init_crypto(0, NULL))
  24         return 0;
  25     global_engine_lock = CRYPTO_THREAD_lock_new();
  26     return global_engine_lock != NULL;
  27 }
  28
  29 ENGINE *ENGINE_new(void)
  30 {
  31     ENGINE *ret;
  32
  33     if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)
  34         || (ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
  35         ENGINEerr(ENGINE_F_ENGINE_NEW, ERR_R_MALLOC_FAILURE);
  36         return NULL;
  37     }
  38     ret->struct_ref = 1;
  39     engine_ref_debug(ret, 0, 1);
  40     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ENGINE, ret, &ret->ex_data)) {
  41         OPENSSL_free(ret);
  42         return NULL;
  43     }
  44     return ret;
  45 }
  46
  47 /*
  48  * Placed here (close proximity to ENGINE_new) so that modifications to the
  49  * elements of the ENGINE structure are more likely to be caught and changed
  50  * here.
  51  */
  52 void engine_set_all_null(ENGINE *e)
  53 {
  54     e->id = NULL;
  55     e->name = NULL;
  56     e->rsa_meth = NULL;
  57     e->dsa_meth = NULL;
  58     e->dh_meth = NULL;
  59     e->rand_meth = NULL;
  60     e->ciphers = NULL;
  61     e->digests = NULL;
  62     e->destroy = NULL;
  63     e->init = NULL;
  64     e->finish = NULL;
  65     e->ctrl = NULL;
  66     e->load_privkey = NULL;
  67     e->load_pubkey = NULL;
  68     e->cmd_defns = NULL;
  69     e->flags = 0;
  70 }
  71
  72 int engine_free_util(ENGINE *e, int not_locked)
  73 {
  74     int i;
  75
  76     if (e == NULL)
  77         return 1;
  78 #ifdef HAVE_ATOMICS
  79     CRYPTO_DOWN_REF(&e->struct_ref, &i, global_engine_lock);
  80 #else
  81     if (not_locked)
  82         CRYPTO_atomic_add(&e->struct_ref, -1, &i, global_engine_lock);
  83     else
  84         i = --e->struct_ref;
  85 #endif
  86     engine_ref_debug(e, 0, -1);
  87     if (i > 0)
  88         return 1;
  89     REF_ASSERT_ISNT(i < 0);
  90     /* Free up any dynamically allocated public key methods */
  91     engine_pkey_meths_free(e);
  92     engine_pkey_asn1_meths_free(e);
  93     /*
  94      * Give the ENGINE a chance to do any structural cleanup corresponding to
  95      * allocation it did in its constructor (eg. unload error strings)
  96      */
  97     if (e->destroy)
  98         e->destroy(e);
  99     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ENGINE, e, &e->ex_data);
 100     OPENSSL_free(e);
 101     return 1;
 102 }
 103
 104 int ENGINE_free(ENGINE *e)
 105 {
 106     return engine_free_util(e, 1);
 107 }
 108
 109 /* Cleanup stuff */
 110
 111 /*
 112  * engine_cleanup_int() is coded such that anything that does work that will
 113  * need cleanup can register a "cleanup" callback here. That way we don't get
 114  * linker bloat by referring to all *possible* cleanups, but any linker bloat
 115  * into code "X" will cause X's cleanup function to end up here.
 116  */
 117 static STACK_OF(ENGINE_CLEANUP_ITEM) *cleanup_stack = NULL;
 118 static int int_cleanup_check(int create)
 119 {
 120     if (cleanup_stack)
 121         return 1;
 122     if (!create)
 123         return 0;
 124     cleanup_stack = sk_ENGINE_CLEANUP_ITEM_new_null();
 125     return (cleanup_stack ? 1 : 0);
 126 }
 127
 128 static ENGINE_CLEANUP_ITEM *int_cleanup_item(ENGINE_CLEANUP_CB *cb)
 129 {
 130     ENGINE_CLEANUP_ITEM *item;
 131
 132     if ((item = OPENSSL_malloc(sizeof(*item))) == NULL) {
 133         ENGINEerr(ENGINE_F_INT_CLEANUP_ITEM, ERR_R_MALLOC_FAILURE);
 134         return NULL;
 135     }
 136     item->cb = cb;
 137     return item;
 138 }
 139
 140 void engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb)
 141 {
 142     ENGINE_CLEANUP_ITEM *item;
 143
 144     if (!int_cleanup_check(1))
 145         return;
 146     item = int_cleanup_item(cb);
 147     if (item)
 148         sk_ENGINE_CLEANUP_ITEM_insert(cleanup_stack, item, 0);
 149 }
 150
 151 void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb)
 152 {
 153     ENGINE_CLEANUP_ITEM *item;
 154     if (!int_cleanup_check(1))
 155         return;
 156     item = int_cleanup_item(cb);
 157     if (item != NULL) {
 158         if (sk_ENGINE_CLEANUP_ITEM_push(cleanup_stack, item) <= 0)
 159             OPENSSL_free(item);
 160     }
 161 }
 162
 163 /* The API function that performs all cleanup */
 164 static void engine_cleanup_cb_free(ENGINE_CLEANUP_ITEM *item)
 165 {
 166     (*(item->cb)) ();
 167     OPENSSL_free(item);
 168 }
 169
 170 void engine_cleanup_int(void)
 171 {
 172     if (int_cleanup_check(0)) {
 173         sk_ENGINE_CLEANUP_ITEM_pop_free(cleanup_stack,
 174                                         engine_cleanup_cb_free);
 175         cleanup_stack = NULL;
 176     }
 177     CRYPTO_THREAD_lock_free(global_engine_lock);
 178 }
 179
 180 /* Now the "ex_data" support */
 181
 182 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg)
 183 {
 184     return CRYPTO_set_ex_data(&e->ex_data, idx, arg);
 185 }
 186
 187 void *ENGINE_get_ex_data(const ENGINE *e, int idx)
 188 {
 189     return CRYPTO_get_ex_data(&e->ex_data, idx);
 190 }
 191
 192 /*
 193  * Functions to get/set an ENGINE's elements - mainly to avoid exposing the
 194  * ENGINE structure itself.
 195  */
 196
 197 int ENGINE_set_id(ENGINE *e, const char *id)
 198 {
 199     if (id == NULL) {
 200         ENGINEerr(ENGINE_F_ENGINE_SET_ID, ERR_R_PASSED_NULL_PARAMETER);
 201         return 0;
 202     }
 203     e->id = id;
 204     return 1;
 205 }
 206
 207 int ENGINE_set_name(ENGINE *e, const char *name)
 208 {
 209     if (name == NULL) {
 210         ENGINEerr(ENGINE_F_ENGINE_SET_NAME, ERR_R_PASSED_NULL_PARAMETER);
 211         return 0;
 212     }
 213     e->name = name;
 214     return 1;
 215 }
 216
 217 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f)
 218 {
 219     e->destroy = destroy_f;
 220     return 1;
 221 }
 222
 223 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f)
 224 {
 225     e->init = init_f;
 226     return 1;
 227 }
 228
 229 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f)
 230 {
 231     e->finish = finish_f;
 232     return 1;
 233 }
 234
 235 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f)
 236 {
 237     e->ctrl = ctrl_f;
 238     return 1;
 239 }
 240
 241 int ENGINE_set_flags(ENGINE *e, int flags)
 242 {
 243     e->flags = flags;
 244     return 1;
 245 }
 246
 247 int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns)
 248 {
 249     e->cmd_defns = defns;
 250     return 1;
 251 }
 252
 253 const char *ENGINE_get_id(const ENGINE *e)
 254 {
 255     return e->id;
 256 }
 257
 258 const char *ENGINE_get_name(const ENGINE *e)
 259 {
 260     return e->name;
 261 }
 262
 263 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e)
 264 {
 265     return e->destroy;
 266 }
 267
 268 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e)
 269 {
 270     return e->init;
 271 }
 272
 273 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e)
 274 {
 275     return e->finish;
 276 }
 277
 278 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e)
 279 {
 280     return e->ctrl;
 281 }
 282
 283 int ENGINE_get_flags(const ENGINE *e)
 284 {
 285     return e->flags;
 286 }
 287
 288 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e)
 289 {
 290     return e->cmd_defns;
 291 }
 292
 293 /*
 294  * eng_lib.o is pretty much linked into anything that touches ENGINE already,
 295  * so put the "static_state" hack here.
 296  */
 297
 298 static int internal_static_hack = 0;
 299
 300 void *ENGINE_get_static_state(void)
 301 {
 302     return &internal_static_hack;
 303 }