1 /* 2 * Copyright 2006-2022 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 /* We need to use some engine deprecated APIs */ 11 #define OPENSSL_SUPPRESS_DEPRECATED 12 13 #include "internal/cryptlib.h" 14 #include <stdio.h> 15 #include <openssl/asn1t.h> 16 #include <openssl/x509.h> 17 #include <openssl/engine.h> 18 #include "crypto/asn1.h" 19 #include "crypto/evp.h" 20 21 #include "standard_methods.h" 22 23 typedef int sk_cmp_fn_type(const char *const *a, const char *const *b); 24 static STACK_OF(EVP_PKEY_ASN1_METHOD) *app_methods = NULL; 25 26 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *, 27 const EVP_PKEY_ASN1_METHOD *, ameth); 28 29 static int ameth_cmp(const EVP_PKEY_ASN1_METHOD *const *a, 30 const EVP_PKEY_ASN1_METHOD *const *b) 31 { 32 return ((*a)->pkey_id - (*b)->pkey_id); 33 } 34 35 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_ASN1_METHOD *, 36 const EVP_PKEY_ASN1_METHOD *, ameth); 37 38 int EVP_PKEY_asn1_get_count(void) 39 { 40 int num = OSSL_NELEM(standard_methods); 41 if (app_methods) 42 num += sk_EVP_PKEY_ASN1_METHOD_num(app_methods); 43 return num; 44 } 45 46 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_get0(int idx) 47 { 48 int num = OSSL_NELEM(standard_methods); 49 if (idx < 0) 50 return NULL; 51 if (idx < num) 52 return standard_methods[idx]; 53 idx -= num; 54 return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx); 55 } 56 57 static const EVP_PKEY_ASN1_METHOD *pkey_asn1_find(int type) 58 { 59 EVP_PKEY_ASN1_METHOD tmp; 60 const EVP_PKEY_ASN1_METHOD *t = &tmp, **ret; 61 62 tmp.pkey_id = type; 63 if (app_methods) { 64 int idx; 65 idx = sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp); 66 if (idx >= 0) 67 return sk_EVP_PKEY_ASN1_METHOD_value(app_methods, idx); 68 } 69 ret = OBJ_bsearch_ameth(&t, standard_methods, OSSL_NELEM(standard_methods)); 70 if (ret == NULL || *ret == NULL) 71 return NULL; 72 return *ret; 73 } 74 75 /* 76 * Find an implementation of an ASN1 algorithm. If 'pe' is not NULL also 77 * search through engines and set *pe to a functional reference to the engine 78 * implementing 'type' or NULL if no engine implements it. 79 */ 80 81 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pe, int type) 82 { 83 const EVP_PKEY_ASN1_METHOD *t; 84 85 for (;;) { 86 t = pkey_asn1_find(type); 87 if (!t || !(t->pkey_flags & ASN1_PKEY_ALIAS)) 88 break; 89 type = t->pkey_base_id; 90 } 91 if (pe) { 92 #ifndef OPENSSL_NO_ENGINE 93 ENGINE *e; 94 /* type will contain the final unaliased type */ 95 e = ENGINE_get_pkey_asn1_meth_engine(type); 96 if (e) { 97 *pe = e; 98 return ENGINE_get_pkey_asn1_meth(e, type); 99 } 100 #endif 101 *pe = NULL; 102 } 103 return t; 104 } 105 106 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str(ENGINE **pe, 107 const char *str, int len) 108 { 109 int i; 110 const EVP_PKEY_ASN1_METHOD *ameth = NULL; 111 112 if (len == -1) 113 len = strlen(str); 114 if (pe) { 115 #ifndef OPENSSL_NO_ENGINE 116 ENGINE *e; 117 ameth = ENGINE_pkey_asn1_find_str(&e, str, len); 118 if (ameth) { 119 /* 120 * Convert structural into functional reference 121 */ 122 if (!ENGINE_init(e)) 123 ameth = NULL; 124 ENGINE_free(e); 125 *pe = e; 126 return ameth; 127 } 128 #endif 129 *pe = NULL; 130 } 131 for (i = EVP_PKEY_asn1_get_count(); i-- > 0; ) { 132 ameth = EVP_PKEY_asn1_get0(i); 133 if (ameth->pkey_flags & ASN1_PKEY_ALIAS) 134 continue; 135 if ((int)strlen(ameth->pem_str) == len 136 && OPENSSL_strncasecmp(ameth->pem_str, str, len) == 0) 137 return ameth; 138 } 139 return NULL; 140 } 141 142 int EVP_PKEY_asn1_add0(const EVP_PKEY_ASN1_METHOD *ameth) 143 { 144 EVP_PKEY_ASN1_METHOD tmp = { 0, }; 145 146 /* 147 * One of the following must be true: 148 * 149 * pem_str == NULL AND ASN1_PKEY_ALIAS is set 150 * pem_str != NULL AND ASN1_PKEY_ALIAS is clear 151 * 152 * Anything else is an error and may lead to a corrupt ASN1 method table 153 */ 154 if (!((ameth->pem_str == NULL 155 && (ameth->pkey_flags & ASN1_PKEY_ALIAS) != 0) 156 || (ameth->pem_str != NULL 157 && (ameth->pkey_flags & ASN1_PKEY_ALIAS) == 0))) { 158 ERR_raise(ERR_LIB_EVP, ERR_R_PASSED_INVALID_ARGUMENT); 159 return 0; 160 } 161 162 if (app_methods == NULL) { 163 app_methods = sk_EVP_PKEY_ASN1_METHOD_new(ameth_cmp); 164 if (app_methods == NULL) 165 return 0; 166 } 167 168 tmp.pkey_id = ameth->pkey_id; 169 if (sk_EVP_PKEY_ASN1_METHOD_find(app_methods, &tmp) >= 0) { 170 ERR_raise(ERR_LIB_EVP, 171 EVP_R_PKEY_APPLICATION_ASN1_METHOD_ALREADY_REGISTERED); 172 return 0; 173 } 174 175 if (!sk_EVP_PKEY_ASN1_METHOD_push(app_methods, ameth)) 176 return 0; 177 sk_EVP_PKEY_ASN1_METHOD_sort(app_methods); 178 return 1; 179 } 180 181 int EVP_PKEY_asn1_add_alias(int to, int from) 182 { 183 EVP_PKEY_ASN1_METHOD *ameth; 184 ameth = EVP_PKEY_asn1_new(from, ASN1_PKEY_ALIAS, NULL, NULL); 185 if (ameth == NULL) 186 return 0; 187 ameth->pkey_base_id = to; 188 if (!EVP_PKEY_asn1_add0(ameth)) { 189 EVP_PKEY_asn1_free(ameth); 190 return 0; 191 } 192 return 1; 193 } 194 195 int EVP_PKEY_asn1_get0_info(int *ppkey_id, int *ppkey_base_id, 196 int *ppkey_flags, const char **pinfo, 197 const char **ppem_str, 198 const EVP_PKEY_ASN1_METHOD *ameth) 199 { 200 if (!ameth) 201 return 0; 202 if (ppkey_id) 203 *ppkey_id = ameth->pkey_id; 204 if (ppkey_base_id) 205 *ppkey_base_id = ameth->pkey_base_id; 206 if (ppkey_flags) 207 *ppkey_flags = ameth->pkey_flags; 208 if (pinfo) 209 *pinfo = ameth->info; 210 if (ppem_str) 211 *ppem_str = ameth->pem_str; 212 return 1; 213 } 214 215 const EVP_PKEY_ASN1_METHOD *EVP_PKEY_get0_asn1(const EVP_PKEY *pkey) 216 { 217 return pkey->ameth; 218 } 219 220 EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags, 221 const char *pem_str, const char *info) 222 { 223 EVP_PKEY_ASN1_METHOD *ameth = OPENSSL_zalloc(sizeof(*ameth)); 224 225 if (ameth == NULL) { 226 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE); 227 return NULL; 228 } 229 230 ameth->pkey_id = id; 231 ameth->pkey_base_id = id; 232 ameth->pkey_flags = flags | ASN1_PKEY_DYNAMIC; 233 234 if (info) { 235 ameth->info = OPENSSL_strdup(info); 236 if (ameth->info == NULL) 237 goto err; 238 } 239 240 if (pem_str) { 241 ameth->pem_str = OPENSSL_strdup(pem_str); 242 if (ameth->pem_str == NULL) 243 goto err; 244 } 245 246 return ameth; 247 248 err: 249 EVP_PKEY_asn1_free(ameth); 250 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE); 251 return NULL; 252 } 253 254 void EVP_PKEY_asn1_copy(EVP_PKEY_ASN1_METHOD *dst, 255 const EVP_PKEY_ASN1_METHOD *src) 256 { 257 int pkey_id = dst->pkey_id; 258 int pkey_base_id = dst->pkey_base_id; 259 unsigned long pkey_flags = dst->pkey_flags; 260 char *pem_str = dst->pem_str; 261 char *info = dst->info; 262 263 *dst = *src; 264 265 /* We only copy the function pointers so restore the other values */ 266 dst->pkey_id = pkey_id; 267 dst->pkey_base_id = pkey_base_id; 268 dst->pkey_flags = pkey_flags; 269 dst->pem_str = pem_str; 270 dst->info = info; 271 } 272 273 void EVP_PKEY_asn1_free(EVP_PKEY_ASN1_METHOD *ameth) 274 { 275 if (ameth && (ameth->pkey_flags & ASN1_PKEY_DYNAMIC)) { 276 OPENSSL_free(ameth->pem_str); 277 OPENSSL_free(ameth->info); 278 OPENSSL_free(ameth); 279 } 280 } 281 282 void EVP_PKEY_asn1_set_public(EVP_PKEY_ASN1_METHOD *ameth, 283 int (*pub_decode) (EVP_PKEY *pk, 284 const X509_PUBKEY *pub), 285 int (*pub_encode) (X509_PUBKEY *pub, 286 const EVP_PKEY *pk), 287 int (*pub_cmp) (const EVP_PKEY *a, 288 const EVP_PKEY *b), 289 int (*pub_print) (BIO *out, 290 const EVP_PKEY *pkey, 291 int indent, ASN1_PCTX *pctx), 292 int (*pkey_size) (const EVP_PKEY *pk), 293 int (*pkey_bits) (const EVP_PKEY *pk)) 294 { 295 ameth->pub_decode = pub_decode; 296 ameth->pub_encode = pub_encode; 297 ameth->pub_cmp = pub_cmp; 298 ameth->pub_print = pub_print; 299 ameth->pkey_size = pkey_size; 300 ameth->pkey_bits = pkey_bits; 301 } 302 303 void EVP_PKEY_asn1_set_private(EVP_PKEY_ASN1_METHOD *ameth, 304 int (*priv_decode) (EVP_PKEY *pk, 305 const PKCS8_PRIV_KEY_INFO 306 *p8inf), 307 int (*priv_encode) (PKCS8_PRIV_KEY_INFO *p8, 308 const EVP_PKEY *pk), 309 int (*priv_print) (BIO *out, 310 const EVP_PKEY *pkey, 311 int indent, 312 ASN1_PCTX *pctx)) 313 { 314 ameth->priv_decode = priv_decode; 315 ameth->priv_encode = priv_encode; 316 ameth->priv_print = priv_print; 317 } 318 319 void EVP_PKEY_asn1_set_param(EVP_PKEY_ASN1_METHOD *ameth, 320 int (*param_decode) (EVP_PKEY *pkey, 321 const unsigned char **pder, 322 int derlen), 323 int (*param_encode) (const EVP_PKEY *pkey, 324 unsigned char **pder), 325 int (*param_missing) (const EVP_PKEY *pk), 326 int (*param_copy) (EVP_PKEY *to, 327 const EVP_PKEY *from), 328 int (*param_cmp) (const EVP_PKEY *a, 329 const EVP_PKEY *b), 330 int (*param_print) (BIO *out, 331 const EVP_PKEY *pkey, 332 int indent, ASN1_PCTX *pctx)) 333 { 334 ameth->param_decode = param_decode; 335 ameth->param_encode = param_encode; 336 ameth->param_missing = param_missing; 337 ameth->param_copy = param_copy; 338 ameth->param_cmp = param_cmp; 339 ameth->param_print = param_print; 340 } 341 342 void EVP_PKEY_asn1_set_free(EVP_PKEY_ASN1_METHOD *ameth, 343 void (*pkey_free) (EVP_PKEY *pkey)) 344 { 345 ameth->pkey_free = pkey_free; 346 } 347 348 void EVP_PKEY_asn1_set_ctrl(EVP_PKEY_ASN1_METHOD *ameth, 349 int (*pkey_ctrl) (EVP_PKEY *pkey, int op, 350 long arg1, void *arg2)) 351 { 352 ameth->pkey_ctrl = pkey_ctrl; 353 } 354 355 void EVP_PKEY_asn1_set_security_bits(EVP_PKEY_ASN1_METHOD *ameth, 356 int (*pkey_security_bits) (const EVP_PKEY 357 *pk)) 358 { 359 ameth->pkey_security_bits = pkey_security_bits; 360 } 361 362 void EVP_PKEY_asn1_set_item(EVP_PKEY_ASN1_METHOD *ameth, 363 int (*item_verify) (EVP_MD_CTX *ctx, 364 const ASN1_ITEM *it, 365 const void *data, 366 const X509_ALGOR *a, 367 const ASN1_BIT_STRING *sig, 368 EVP_PKEY *pkey), 369 int (*item_sign) (EVP_MD_CTX *ctx, 370 const ASN1_ITEM *it, 371 const void *data, 372 X509_ALGOR *alg1, 373 X509_ALGOR *alg2, 374 ASN1_BIT_STRING *sig)) 375 { 376 ameth->item_sign = item_sign; 377 ameth->item_verify = item_verify; 378 } 379 380 void EVP_PKEY_asn1_set_siginf(EVP_PKEY_ASN1_METHOD *ameth, 381 int (*siginf_set) (X509_SIG_INFO *siginf, 382 const X509_ALGOR *alg, 383 const ASN1_STRING *sig)) 384 { 385 ameth->siginf_set = siginf_set; 386 } 387 388 void EVP_PKEY_asn1_set_check(EVP_PKEY_ASN1_METHOD *ameth, 389 int (*pkey_check) (const EVP_PKEY *pk)) 390 { 391 ameth->pkey_check = pkey_check; 392 } 393 394 void EVP_PKEY_asn1_set_public_check(EVP_PKEY_ASN1_METHOD *ameth, 395 int (*pkey_pub_check) (const EVP_PKEY *pk)) 396 { 397 ameth->pkey_public_check = pkey_pub_check; 398 } 399 400 void EVP_PKEY_asn1_set_param_check(EVP_PKEY_ASN1_METHOD *ameth, 401 int (*pkey_param_check) (const EVP_PKEY *pk)) 402 { 403 ameth->pkey_param_check = pkey_param_check; 404 } 405 406 void EVP_PKEY_asn1_set_set_priv_key(EVP_PKEY_ASN1_METHOD *ameth, 407 int (*set_priv_key) (EVP_PKEY *pk, 408 const unsigned char 409 *priv, 410 size_t len)) 411 { 412 ameth->set_priv_key = set_priv_key; 413 } 414 415 void EVP_PKEY_asn1_set_set_pub_key(EVP_PKEY_ASN1_METHOD *ameth, 416 int (*set_pub_key) (EVP_PKEY *pk, 417 const unsigned char *pub, 418 size_t len)) 419 { 420 ameth->set_pub_key = set_pub_key; 421 } 422 423 void EVP_PKEY_asn1_set_get_priv_key(EVP_PKEY_ASN1_METHOD *ameth, 424 int (*get_priv_key) (const EVP_PKEY *pk, 425 unsigned char *priv, 426 size_t *len)) 427 { 428 ameth->get_priv_key = get_priv_key; 429 } 430 431 void EVP_PKEY_asn1_set_get_pub_key(EVP_PKEY_ASN1_METHOD *ameth, 432 int (*get_pub_key) (const EVP_PKEY *pk, 433 unsigned char *pub, 434 size_t *len)) 435 { 436 ameth->get_pub_key = get_pub_key; 437 } 438