1 /* 2 * Copyright 2001-2019 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_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 } 175 176 /* Now the "ex_data" support */ 177 178 int ENGINE_set_ex_data(ENGINE *e, int idx, void *arg) 179 { 180 return CRYPTO_set_ex_data(&e->ex_data, idx, arg); 181 } 182 183 void *ENGINE_get_ex_data(const ENGINE *e, int idx) 184 { 185 return CRYPTO_get_ex_data(&e->ex_data, idx); 186 } 187 188 /* 189 * Functions to get/set an ENGINE's elements - mainly to avoid exposing the 190 * ENGINE structure itself. 191 */ 192 193 int ENGINE_set_id(ENGINE *e, const char *id) 194 { 195 if (id == NULL) { 196 ENGINEerr(ENGINE_F_ENGINE_SET_ID, ERR_R_PASSED_NULL_PARAMETER); 197 return 0; 198 } 199 e->id = id; 200 return 1; 201 } 202 203 int ENGINE_set_name(ENGINE *e, const char *name) 204 { 205 if (name == NULL) { 206 ENGINEerr(ENGINE_F_ENGINE_SET_NAME, ERR_R_PASSED_NULL_PARAMETER); 207 return 0; 208 } 209 e->name = name; 210 return 1; 211 } 212 213 int ENGINE_set_destroy_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR destroy_f) 214 { 215 e->destroy = destroy_f; 216 return 1; 217 } 218 219 int ENGINE_set_init_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR init_f) 220 { 221 e->init = init_f; 222 return 1; 223 } 224 225 int ENGINE_set_finish_function(ENGINE *e, ENGINE_GEN_INT_FUNC_PTR finish_f) 226 { 227 e->finish = finish_f; 228 return 1; 229 } 230 231 int ENGINE_set_ctrl_function(ENGINE *e, ENGINE_CTRL_FUNC_PTR ctrl_f) 232 { 233 e->ctrl = ctrl_f; 234 return 1; 235 } 236 237 int ENGINE_set_flags(ENGINE *e, int flags) 238 { 239 e->flags = flags; 240 return 1; 241 } 242 243 int ENGINE_set_cmd_defns(ENGINE *e, const ENGINE_CMD_DEFN *defns) 244 { 245 e->cmd_defns = defns; 246 return 1; 247 } 248 249 const char *ENGINE_get_id(const ENGINE *e) 250 { 251 return e->id; 252 } 253 254 const char *ENGINE_get_name(const ENGINE *e) 255 { 256 return e->name; 257 } 258 259 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_destroy_function(const ENGINE *e) 260 { 261 return e->destroy; 262 } 263 264 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_init_function(const ENGINE *e) 265 { 266 return e->init; 267 } 268 269 ENGINE_GEN_INT_FUNC_PTR ENGINE_get_finish_function(const ENGINE *e) 270 { 271 return e->finish; 272 } 273 274 ENGINE_CTRL_FUNC_PTR ENGINE_get_ctrl_function(const ENGINE *e) 275 { 276 return e->ctrl; 277 } 278 279 int ENGINE_get_flags(const ENGINE *e) 280 { 281 return e->flags; 282 } 283 284 const ENGINE_CMD_DEFN *ENGINE_get_cmd_defns(const ENGINE *e) 285 { 286 return e->cmd_defns; 287 } 288 289 /* 290 * eng_lib.o is pretty much linked into anything that touches ENGINE already, 291 * so put the "static_state" hack here. 292 */ 293 294 static int internal_static_hack = 0; 295 296 void *ENGINE_get_static_state(void) 297 { 298 return &internal_static_hack; 299 } 300