crypto/engine/eng_lib.c

   1 /*
   2  * Copyright 2001-2020 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 "e_os.h"
  11 #include "eng_local.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     if (not_locked)
  79         CRYPTO_DOWN_REF(&e->struct_ref, &i, global_engine_lock);
  80     else
  81         i = --e->struct_ref;
  82     engine_ref_debug(e, 0, -1);
  83     if (i > 0)
  84         return 1;
  85     REF_ASSERT_ISNT(i < 0);
  86     /* Free up any dynamically allocated public key methods */
  87     engine_pkey_meths_free(e);
  88     engine_pkey_asn1_meths_free(e);
  89     /*
  90      * Give the ENGINE a chance to do any structural cleanup corresponding to
  91      * allocation it did in its constructor (eg. unload error strings)
  92      */
  93     if (e->destroy)
  94         e->destroy(e);
  95     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ENGINE, e, &e->ex_data);
  96     OPENSSL_free(e);
  97     return 1;
  98 }
  99
 100 int ENGINE_free(ENGINE *e)
 101 {
 102     return engine_free_util(e, 1);
 103 }
 104
 105 /* Cleanup stuff */
 106
 107 /*
 108  * engine_cleanup_int() is coded such that anything that does work that will
 109  * need cleanup can register a "cleanup" callback here. That way we don't get
 110  * linker bloat by referring to all *possible* cleanups, but any linker bloat
 111  * into code "X" will cause X's cleanup function to end up here.
 112  */
 113 static STACK_OF(ENGINE_CLEANUP_ITEM) *cleanup_stack = NULL;
 114 static int int_cleanup_check(int create)
 115 {
 116     if (cleanup_stack)
 117         return 1;
 118     if (!create)
 119         return 0;
 120     cleanup_stack = sk_ENGINE_CLEANUP_ITEM_new_null();
 121     return (cleanup_stack ? 1 : 0);
 122 }
 123
 124 static ENGINE_CLEANUP_ITEM *int_cleanup_item(ENGINE_CLEANUP_CB *cb)
 125 {
 126     ENGINE_CLEANUP_ITEM *item;
 127
 128     if ((item = OPENSSL_malloc(sizeof(*item))) == NULL) {
 129         ENGINEerr(ENGINE_F_INT_CLEANUP_ITEM, ERR_R_MALLOC_FAILURE);
 130         return NULL;
 131     }
 132     item->cb = cb;
 133     return item;
 134 }
 135
 136 void engine_cleanup_add_first(ENGINE_CLEANUP_CB *cb)
 137 {
 138     ENGINE_CLEANUP_ITEM *item;
 139
 140     if (!int_cleanup_check(1))
 141         return;
 142     item = int_cleanup_item(cb);
 143     if (item)
 144         sk_ENGINE_CLEANUP_ITEM_insert(cleanup_stack, item, 0);
 145 }
 146
 147 void engine_cleanup_add_last(ENGINE_CLEANUP_CB *cb)
 148 {
 149     ENGINE_CLEANUP_ITEM *item;
 150     if (!int_cleanup_check(1))
 151         return;
 152     item = int_cleanup_item(cb);
 153     if (item != NULL) {
 154         if (sk_ENGINE_CLEANUP_ITEM_push(cleanup_stack, item) <= 0)
 155             OPENSSL_free(item);
 156     }
 157 }
 158
 159 /* The API function that performs all cleanup */
 160 static void engine_cleanup_cb_free(ENGINE_CLEANUP_ITEM *item)
 161 {
 162     (*(item->cb)) ();
 163     OPENSSL_free(item);
 164 }
 165
 166 void engine_cleanup_int(void)
 167 {
 168     if (int_cleanup_check(0)) {
 169         sk_ENGINE_CLEANUP_ITEM_pop_free(cleanup_stack,
 170                                         engine_cleanup_cb_free);
 171         cleanup_stack = NULL;
 172     }
 173     CRYPTO_THREAD_lock_free(global_engine_lock);
 174     global_engine_lock = NULL;
 175 }
 176
 177 /* Now the "ex_data" support */
 178
 179 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg)
 180 {
 181     return CRYPTO_set_ex_data(&e->ex_data, idx, arg);
 182 }
 183
 184 void *ENGINE_get_ex_data(const ENGINE *e, int idx)
 185 {
 186     return CRYPTO_get_ex_data(&e->ex_data, idx);
 187 }
 188
 189 /*
 190  * Functions to get/set an ENGINE's elements - mainly to avoid exposing the
 191  * ENGINE structure itself.
 192  */
 193
 194 int ENGINE_set_id(ENGINE *e, const char *id)
 195 {
 196     if (id == NULL) {
 197         ENGINEerr(ENGINE_F_ENGINE_SET_ID, ERR_R_PASSED_NULL_PARAMETER);
 198         return 0;
 199     }
 200     e->id = id;
 201     return 1;
 202 }
 203
 204 int ENGINE_set_name(ENGINE *e, const char *name)
 205 {
 206     if (name == NULL) {
 207         ENGINEerr(ENGINE_F_ENGINE_SET_NAME, ERR_R_PASSED_NULL_PARAMETER);
 208         return 0;
 209     }
 210     e->name = name;
 211     return 1;
 212 }
 213
 214 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f)
 215 {
 216     e->destroy = destroy_f;
 217     return 1;
 218 }
 219
 220 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f)
 221 {
 222     e->init = init_f;
 223     return 1;
 224 }
 225
 226 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f)
 227 {
 228     e->finish = finish_f;
 229     return 1;
 230 }
 231
 232 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f)
 233 {
 234     e->ctrl = ctrl_f;
 235     return 1;
 236 }
 237
 238 int ENGINE_set_flags(ENGINE *e, int flags)
 239 {
 240     e->flags = flags;
 241     return 1;
 242 }
 243
 244 int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns)
 245 {
 246     e->cmd_defns = defns;
 247     return 1;
 248 }
 249
 250 const char *ENGINE_get_id(const ENGINE *e)
 251 {
 252     return e->id;
 253 }
 254
 255 const char *ENGINE_get_name(const ENGINE *e)
 256 {
 257     return e->name;
 258 }
 259
 260 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e)
 261 {
 262     return e->destroy;
 263 }
 264
 265 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e)
 266 {
 267     return e->init;
 268 }
 269
 270 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e)
 271 {
 272     return e->finish;
 273 }
 274
 275 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e)
 276 {
 277     return e->ctrl;
 278 }
 279
 280 int ENGINE_get_flags(const ENGINE *e)
 281 {
 282     return e->flags;
 283 }
 284
 285 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e)
 286 {
 287     return e->cmd_defns;
 288 }
 289
 290 /*
 291  * eng_lib.o is pretty much linked into anything that touches ENGINE already,
 292  * so put the "static_state" hack here.
 293  */
 294
 295 static int internal_static_hack = 0;
 296
 297 void *ENGINE_get_static_state(void)
 298 {
 299     return &internal_static_hack;
 300 }