1 /* 2 * Copyright 1995-2016 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 /* ==================================================================== 11 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 12 * ECC cipher suite support in OpenSSL originally developed by 13 * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project. 14 */ 15 16 #include <stdio.h> 17 #include <sys/types.h> 18 19 #include "e_os.h" 20 #include "internal/o_dir.h" 21 #include <openssl/lhash.h> 22 #include <openssl/bio.h> 23 #include <openssl/pem.h> 24 #include <openssl/x509v3.h> 25 #include <openssl/dh.h> 26 #include <openssl/bn.h> 27 #include <openssl/crypto.h> 28 #include "ssl_locl.h" 29 #include "internal/thread_once.h" 30 31 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx, 32 int op, int bits, int nid, void *other, 33 void *ex); 34 35 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT; 36 static volatile int ssl_x509_store_ctx_idx = -1; 37 38 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init) 39 { 40 ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0, 41 "SSL for verify callback", 42 NULL, NULL, NULL); 43 return ssl_x509_store_ctx_idx >= 0; 44 } 45 46 int SSL_get_ex_data_X509_STORE_CTX_idx(void) 47 { 48 49 if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init)) 50 return -1; 51 return ssl_x509_store_ctx_idx; 52 } 53 54 CERT *ssl_cert_new(void) 55 { 56 CERT *ret = OPENSSL_zalloc(sizeof(*ret)); 57 58 if (ret == NULL) { 59 SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE); 60 return NULL; 61 } 62 63 ret->key = &(ret->pkeys[SSL_PKEY_RSA_ENC]); 64 ret->references = 1; 65 ret->sec_cb = ssl_security_default_callback; 66 ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL; 67 ret->sec_ex = NULL; 68 ret->lock = CRYPTO_THREAD_lock_new(); 69 if (ret->lock == NULL) { 70 SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE); 71 OPENSSL_free(ret); 72 return NULL; 73 } 74 75 return ret; 76 } 77 78 CERT *ssl_cert_dup(CERT *cert) 79 { 80 CERT *ret = OPENSSL_zalloc(sizeof(*ret)); 81 int i; 82 83 if (ret == NULL) { 84 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); 85 return NULL; 86 } 87 88 ret->references = 1; 89 ret->key = &ret->pkeys[cert->key - cert->pkeys]; 90 ret->lock = CRYPTO_THREAD_lock_new(); 91 if (ret->lock == NULL) { 92 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); 93 OPENSSL_free(ret); 94 return NULL; 95 } 96 #ifndef OPENSSL_NO_DH 97 if (cert->dh_tmp != NULL) { 98 ret->dh_tmp = cert->dh_tmp; 99 EVP_PKEY_up_ref(ret->dh_tmp); 100 } 101 ret->dh_tmp_cb = cert->dh_tmp_cb; 102 ret->dh_tmp_auto = cert->dh_tmp_auto; 103 #endif 104 105 for (i = 0; i < SSL_PKEY_NUM; i++) { 106 CERT_PKEY *cpk = cert->pkeys + i; 107 CERT_PKEY *rpk = ret->pkeys + i; 108 if (cpk->x509 != NULL) { 109 rpk->x509 = cpk->x509; 110 X509_up_ref(rpk->x509); 111 } 112 113 if (cpk->privatekey != NULL) { 114 rpk->privatekey = cpk->privatekey; 115 EVP_PKEY_up_ref(cpk->privatekey); 116 } 117 118 if (cpk->chain) { 119 rpk->chain = X509_chain_up_ref(cpk->chain); 120 if (!rpk->chain) { 121 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); 122 goto err; 123 } 124 } 125 if (cert->pkeys[i].serverinfo != NULL) { 126 /* Just copy everything. */ 127 ret->pkeys[i].serverinfo = 128 OPENSSL_malloc(cert->pkeys[i].serverinfo_length); 129 if (ret->pkeys[i].serverinfo == NULL) { 130 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE); 131 goto err; 132 } 133 ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length; 134 memcpy(ret->pkeys[i].serverinfo, 135 cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length); 136 } 137 } 138 139 /* Configured sigalgs copied across */ 140 if (cert->conf_sigalgs) { 141 ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen); 142 if (ret->conf_sigalgs == NULL) 143 goto err; 144 memcpy(ret->conf_sigalgs, cert->conf_sigalgs, cert->conf_sigalgslen); 145 ret->conf_sigalgslen = cert->conf_sigalgslen; 146 } else 147 ret->conf_sigalgs = NULL; 148 149 if (cert->client_sigalgs) { 150 ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen); 151 if (ret->client_sigalgs == NULL) 152 goto err; 153 memcpy(ret->client_sigalgs, cert->client_sigalgs, 154 cert->client_sigalgslen); 155 ret->client_sigalgslen = cert->client_sigalgslen; 156 } else 157 ret->client_sigalgs = NULL; 158 /* Shared sigalgs also NULL */ 159 ret->shared_sigalgs = NULL; 160 /* Copy any custom client certificate types */ 161 if (cert->ctypes) { 162 ret->ctypes = OPENSSL_malloc(cert->ctype_num); 163 if (ret->ctypes == NULL) 164 goto err; 165 memcpy(ret->ctypes, cert->ctypes, cert->ctype_num); 166 ret->ctype_num = cert->ctype_num; 167 } 168 169 ret->cert_flags = cert->cert_flags; 170 171 ret->cert_cb = cert->cert_cb; 172 ret->cert_cb_arg = cert->cert_cb_arg; 173 174 if (cert->verify_store) { 175 X509_STORE_up_ref(cert->verify_store); 176 ret->verify_store = cert->verify_store; 177 } 178 179 if (cert->chain_store) { 180 X509_STORE_up_ref(cert->chain_store); 181 ret->chain_store = cert->chain_store; 182 } 183 184 ret->sec_cb = cert->sec_cb; 185 ret->sec_level = cert->sec_level; 186 ret->sec_ex = cert->sec_ex; 187 188 if (!custom_exts_copy(&ret->cli_ext, &cert->cli_ext)) 189 goto err; 190 if (!custom_exts_copy(&ret->srv_ext, &cert->srv_ext)) 191 goto err; 192 #ifndef OPENSSL_NO_PSK 193 if (cert->psk_identity_hint) { 194 ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint); 195 if (ret->psk_identity_hint == NULL) 196 goto err; 197 } 198 #endif 199 return ret; 200 201 err: 202 ssl_cert_free(ret); 203 204 return NULL; 205 } 206 207 /* Free up and clear all certificates and chains */ 208 209 void ssl_cert_clear_certs(CERT *c) 210 { 211 int i; 212 if (c == NULL) 213 return; 214 for (i = 0; i < SSL_PKEY_NUM; i++) { 215 CERT_PKEY *cpk = c->pkeys + i; 216 X509_free(cpk->x509); 217 cpk->x509 = NULL; 218 EVP_PKEY_free(cpk->privatekey); 219 cpk->privatekey = NULL; 220 sk_X509_pop_free(cpk->chain, X509_free); 221 cpk->chain = NULL; 222 OPENSSL_free(cpk->serverinfo); 223 cpk->serverinfo = NULL; 224 cpk->serverinfo_length = 0; 225 } 226 } 227 228 void ssl_cert_free(CERT *c) 229 { 230 int i; 231 232 if (c == NULL) 233 return; 234 235 CRYPTO_atomic_add(&c->references, -1, &i, c->lock); 236 REF_PRINT_COUNT("CERT", c); 237 if (i > 0) 238 return; 239 REF_ASSERT_ISNT(i < 0); 240 241 #ifndef OPENSSL_NO_DH 242 EVP_PKEY_free(c->dh_tmp); 243 #endif 244 245 ssl_cert_clear_certs(c); 246 OPENSSL_free(c->conf_sigalgs); 247 OPENSSL_free(c->client_sigalgs); 248 OPENSSL_free(c->shared_sigalgs); 249 OPENSSL_free(c->ctypes); 250 X509_STORE_free(c->verify_store); 251 X509_STORE_free(c->chain_store); 252 custom_exts_free(&c->cli_ext); 253 custom_exts_free(&c->srv_ext); 254 #ifndef OPENSSL_NO_PSK 255 OPENSSL_free(c->psk_identity_hint); 256 #endif 257 CRYPTO_THREAD_lock_free(c->lock); 258 OPENSSL_free(c); 259 } 260 261 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain) 262 { 263 int i, r; 264 CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key; 265 if (!cpk) 266 return 0; 267 for (i = 0; i < sk_X509_num(chain); i++) { 268 r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0); 269 if (r != 1) { 270 SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r); 271 return 0; 272 } 273 } 274 sk_X509_pop_free(cpk->chain, X509_free); 275 cpk->chain = chain; 276 return 1; 277 } 278 279 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain) 280 { 281 STACK_OF(X509) *dchain; 282 if (!chain) 283 return ssl_cert_set0_chain(s, ctx, NULL); 284 dchain = X509_chain_up_ref(chain); 285 if (!dchain) 286 return 0; 287 if (!ssl_cert_set0_chain(s, ctx, dchain)) { 288 sk_X509_pop_free(dchain, X509_free); 289 return 0; 290 } 291 return 1; 292 } 293 294 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x) 295 { 296 int r; 297 CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key; 298 if (!cpk) 299 return 0; 300 r = ssl_security_cert(s, ctx, x, 0, 0); 301 if (r != 1) { 302 SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r); 303 return 0; 304 } 305 if (!cpk->chain) 306 cpk->chain = sk_X509_new_null(); 307 if (!cpk->chain || !sk_X509_push(cpk->chain, x)) 308 return 0; 309 return 1; 310 } 311 312 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x) 313 { 314 if (!ssl_cert_add0_chain_cert(s, ctx, x)) 315 return 0; 316 X509_up_ref(x); 317 return 1; 318 } 319 320 int ssl_cert_select_current(CERT *c, X509 *x) 321 { 322 int i; 323 if (x == NULL) 324 return 0; 325 for (i = 0; i < SSL_PKEY_NUM; i++) { 326 CERT_PKEY *cpk = c->pkeys + i; 327 if (cpk->x509 == x && cpk->privatekey) { 328 c->key = cpk; 329 return 1; 330 } 331 } 332 333 for (i = 0; i < SSL_PKEY_NUM; i++) { 334 CERT_PKEY *cpk = c->pkeys + i; 335 if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) { 336 c->key = cpk; 337 return 1; 338 } 339 } 340 return 0; 341 } 342 343 int ssl_cert_set_current(CERT *c, long op) 344 { 345 int i, idx; 346 if (!c) 347 return 0; 348 if (op == SSL_CERT_SET_FIRST) 349 idx = 0; 350 else if (op == SSL_CERT_SET_NEXT) { 351 idx = (int)(c->key - c->pkeys + 1); 352 if (idx >= SSL_PKEY_NUM) 353 return 0; 354 } else 355 return 0; 356 for (i = idx; i < SSL_PKEY_NUM; i++) { 357 CERT_PKEY *cpk = c->pkeys + i; 358 if (cpk->x509 && cpk->privatekey) { 359 c->key = cpk; 360 return 1; 361 } 362 } 363 return 0; 364 } 365 366 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg) 367 { 368 c->cert_cb = cb; 369 c->cert_cb_arg = arg; 370 } 371 372 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk) 373 { 374 X509 *x; 375 int i = 0; 376 X509_STORE *verify_store; 377 X509_STORE_CTX *ctx = NULL; 378 X509_VERIFY_PARAM *param; 379 380 if ((sk == NULL) || (sk_X509_num(sk) == 0)) 381 return 0; 382 383 if (s->cert->verify_store) 384 verify_store = s->cert->verify_store; 385 else 386 verify_store = s->ctx->cert_store; 387 388 ctx = X509_STORE_CTX_new(); 389 if (ctx == NULL) { 390 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE); 391 return 0; 392 } 393 394 x = sk_X509_value(sk, 0); 395 if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) { 396 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB); 397 goto end; 398 } 399 param = X509_STORE_CTX_get0_param(ctx); 400 /* 401 * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some 402 * point, for now a single @SECLEVEL sets the same policy for TLS crypto 403 * and PKI authentication. 404 */ 405 X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s)); 406 407 /* Set suite B flags if needed */ 408 X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s)); 409 if (!X509_STORE_CTX_set_ex_data 410 (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) { 411 goto end; 412 } 413 414 /* Verify via DANE if enabled */ 415 if (DANETLS_ENABLED(&s->dane)) 416 X509_STORE_CTX_set0_dane(ctx, &s->dane); 417 418 /* 419 * We need to inherit the verify parameters. These can be determined by 420 * the context: if its a server it will verify SSL client certificates or 421 * vice versa. 422 */ 423 424 X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server"); 425 /* 426 * Anything non-default in "s->param" should overwrite anything in the ctx. 427 */ 428 X509_VERIFY_PARAM_set1(param, s->param); 429 430 if (s->verify_callback) 431 X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback); 432 433 if (s->ctx->app_verify_callback != NULL) 434 i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg); 435 else 436 i = X509_verify_cert(ctx); 437 438 s->verify_result = X509_STORE_CTX_get_error(ctx); 439 sk_X509_pop_free(s->verified_chain, X509_free); 440 s->verified_chain = NULL; 441 if (X509_STORE_CTX_get0_chain(ctx) != NULL) { 442 s->verified_chain = X509_STORE_CTX_get1_chain(ctx); 443 if (s->verified_chain == NULL) { 444 SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE); 445 i = 0; 446 } 447 } 448 449 /* Move peername from the store context params to the SSL handle's */ 450 X509_VERIFY_PARAM_move_peername(s->param, param); 451 452 end: 453 X509_STORE_CTX_free(ctx); 454 return i; 455 } 456 457 static void set_client_CA_list(STACK_OF(X509_NAME) **ca_list, 458 STACK_OF(X509_NAME) *name_list) 459 { 460 sk_X509_NAME_pop_free(*ca_list, X509_NAME_free); 461 *ca_list = name_list; 462 } 463 464 STACK_OF(X509_NAME) *SSL_dup_CA_list(STACK_OF(X509_NAME) *sk) 465 { 466 int i; 467 STACK_OF(X509_NAME) *ret; 468 X509_NAME *name; 469 470 ret = sk_X509_NAME_new_null(); 471 if (ret == NULL) { 472 SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE); 473 return NULL; 474 } 475 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 476 name = X509_NAME_dup(sk_X509_NAME_value(sk, i)); 477 if (name == NULL || !sk_X509_NAME_push(ret, name)) { 478 sk_X509_NAME_pop_free(ret, X509_NAME_free); 479 X509_NAME_free(name); 480 return NULL; 481 } 482 } 483 return (ret); 484 } 485 486 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list) 487 { 488 set_client_CA_list(&(s->client_CA), name_list); 489 } 490 491 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list) 492 { 493 set_client_CA_list(&(ctx->client_CA), name_list); 494 } 495 496 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx) 497 { 498 return (ctx->client_CA); 499 } 500 501 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s) 502 { 503 if (!s->server) { /* we are in the client */ 504 if (((s->version >> 8) == SSL3_VERSION_MAJOR) && (s->s3 != NULL)) 505 return (s->s3->tmp.ca_names); 506 else 507 return (NULL); 508 } else { 509 if (s->client_CA != NULL) 510 return (s->client_CA); 511 else 512 return (s->ctx->client_CA); 513 } 514 } 515 516 static int add_client_CA(STACK_OF(X509_NAME) **sk, X509 *x) 517 { 518 X509_NAME *name; 519 520 if (x == NULL) 521 return (0); 522 if ((*sk == NULL) && ((*sk = sk_X509_NAME_new_null()) == NULL)) 523 return (0); 524 525 if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL) 526 return (0); 527 528 if (!sk_X509_NAME_push(*sk, name)) { 529 X509_NAME_free(name); 530 return (0); 531 } 532 return (1); 533 } 534 535 int SSL_add_client_CA(SSL *ssl, X509 *x) 536 { 537 return (add_client_CA(&(ssl->client_CA), x)); 538 } 539 540 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x) 541 { 542 return (add_client_CA(&(ctx->client_CA), x)); 543 } 544 545 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b) 546 { 547 return (X509_NAME_cmp(*a, *b)); 548 } 549 550 static int xname_cmp(const X509_NAME *a, const X509_NAME *b) 551 { 552 return X509_NAME_cmp(a, b); 553 } 554 555 static unsigned long xname_hash(const X509_NAME *a) 556 { 557 return X509_NAME_hash((X509_NAME *)a); 558 } 559 560 /** 561 * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed; 562 * it doesn't really have anything to do with clients (except that a common use 563 * for a stack of CAs is to send it to the client). Actually, it doesn't have 564 * much to do with CAs, either, since it will load any old cert. 565 * \param file the file containing one or more certs. 566 * \return a ::STACK containing the certs. 567 */ 568 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file) 569 { 570 BIO *in = BIO_new(BIO_s_file()); 571 X509 *x = NULL; 572 X509_NAME *xn = NULL; 573 STACK_OF(X509_NAME) *ret = NULL; 574 LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp); 575 576 if ((name_hash == NULL) || (in == NULL)) { 577 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE); 578 goto err; 579 } 580 581 if (!BIO_read_filename(in, file)) 582 goto err; 583 584 for (;;) { 585 if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) 586 break; 587 if (ret == NULL) { 588 ret = sk_X509_NAME_new_null(); 589 if (ret == NULL) { 590 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE); 591 goto err; 592 } 593 } 594 if ((xn = X509_get_subject_name(x)) == NULL) 595 goto err; 596 /* check for duplicates */ 597 xn = X509_NAME_dup(xn); 598 if (xn == NULL) 599 goto err; 600 if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) { 601 /* Duplicate. */ 602 X509_NAME_free(xn); 603 xn = NULL; 604 } else { 605 lh_X509_NAME_insert(name_hash, xn); 606 if (!sk_X509_NAME_push(ret, xn)) 607 goto err; 608 } 609 } 610 goto done; 611 612 err: 613 X509_NAME_free(xn); 614 sk_X509_NAME_pop_free(ret, X509_NAME_free); 615 ret = NULL; 616 done: 617 BIO_free(in); 618 X509_free(x); 619 lh_X509_NAME_free(name_hash); 620 if (ret != NULL) 621 ERR_clear_error(); 622 return (ret); 623 } 624 625 /** 626 * Add a file of certs to a stack. 627 * \param stack the stack to add to. 628 * \param file the file to add from. All certs in this file that are not 629 * already in the stack will be added. 630 * \return 1 for success, 0 for failure. Note that in the case of failure some 631 * certs may have been added to \c stack. 632 */ 633 634 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack, 635 const char *file) 636 { 637 BIO *in; 638 X509 *x = NULL; 639 X509_NAME *xn = NULL; 640 int ret = 1; 641 int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b); 642 643 oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp); 644 645 in = BIO_new(BIO_s_file()); 646 647 if (in == NULL) { 648 SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE); 649 goto err; 650 } 651 652 if (!BIO_read_filename(in, file)) 653 goto err; 654 655 for (;;) { 656 if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL) 657 break; 658 if ((xn = X509_get_subject_name(x)) == NULL) 659 goto err; 660 xn = X509_NAME_dup(xn); 661 if (xn == NULL) 662 goto err; 663 if (sk_X509_NAME_find(stack, xn) >= 0) { 664 /* Duplicate. */ 665 X509_NAME_free(xn); 666 } else if (!sk_X509_NAME_push(stack, xn)) { 667 X509_NAME_free(xn); 668 goto err; 669 } 670 } 671 672 ERR_clear_error(); 673 goto done; 674 675 err: 676 ret = 0; 677 done: 678 BIO_free(in); 679 X509_free(x); 680 (void)sk_X509_NAME_set_cmp_func(stack, oldcmp); 681 return ret; 682 } 683 684 /** 685 * Add a directory of certs to a stack. 686 * \param stack the stack to append to. 687 * \param dir the directory to append from. All files in this directory will be 688 * examined as potential certs. Any that are acceptable to 689 * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be 690 * included. 691 * \return 1 for success, 0 for failure. Note that in the case of failure some 692 * certs may have been added to \c stack. 693 */ 694 695 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack, 696 const char *dir) 697 { 698 OPENSSL_DIR_CTX *d = NULL; 699 const char *filename; 700 int ret = 0; 701 702 /* Note that a side effect is that the CAs will be sorted by name */ 703 704 while ((filename = OPENSSL_DIR_read(&d, dir))) { 705 char buf[1024]; 706 int r; 707 708 if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) { 709 SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, 710 SSL_R_PATH_TOO_LONG); 711 goto err; 712 } 713 #ifdef OPENSSL_SYS_VMS 714 r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename); 715 #else 716 r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename); 717 #endif 718 if (r <= 0 || r >= (int)sizeof(buf)) 719 goto err; 720 if (!SSL_add_file_cert_subjects_to_stack(stack, buf)) 721 goto err; 722 } 723 724 if (errno) { 725 SYSerr(SYS_F_OPENDIR, get_last_sys_error()); 726 ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')"); 727 SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB); 728 goto err; 729 } 730 731 ret = 1; 732 733 err: 734 if (d) 735 OPENSSL_DIR_end(&d); 736 737 return ret; 738 } 739 740 /* Add a certificate to a BUF_MEM structure */ 741 742 static int ssl_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x) 743 { 744 int n; 745 unsigned char *p; 746 747 n = i2d_X509(x, NULL); 748 if (n < 0 || !BUF_MEM_grow_clean(buf, (int)(n + (*l) + 3))) { 749 SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB); 750 return 0; 751 } 752 p = (unsigned char *)&(buf->data[*l]); 753 l2n3(n, p); 754 n = i2d_X509(x, &p); 755 if (n < 0) { 756 /* Shouldn't happen */ 757 SSLerr(SSL_F_SSL_ADD_CERT_TO_BUF, ERR_R_BUF_LIB); 758 return 0; 759 } 760 *l += n + 3; 761 762 return 1; 763 } 764 765 /* Add certificate chain to internal SSL BUF_MEM structure */ 766 int ssl_add_cert_chain(SSL *s, CERT_PKEY *cpk, unsigned long *l) 767 { 768 BUF_MEM *buf = s->init_buf; 769 int i, chain_count; 770 X509 *x; 771 STACK_OF(X509) *extra_certs; 772 STACK_OF(X509) *chain = NULL; 773 X509_STORE *chain_store; 774 775 /* TLSv1 sends a chain with nothing in it, instead of an alert */ 776 if (!BUF_MEM_grow_clean(buf, 10)) { 777 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_BUF_LIB); 778 return 0; 779 } 780 781 if (!cpk || !cpk->x509) 782 return 1; 783 784 x = cpk->x509; 785 786 /* 787 * If we have a certificate specific chain use it, else use parent ctx. 788 */ 789 if (cpk->chain) 790 extra_certs = cpk->chain; 791 else 792 extra_certs = s->ctx->extra_certs; 793 794 if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs) 795 chain_store = NULL; 796 else if (s->cert->chain_store) 797 chain_store = s->cert->chain_store; 798 else 799 chain_store = s->ctx->cert_store; 800 801 if (chain_store) { 802 X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new(); 803 804 if (xs_ctx == NULL) { 805 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); 806 return (0); 807 } 808 if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) { 809 X509_STORE_CTX_free(xs_ctx); 810 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, ERR_R_X509_LIB); 811 return (0); 812 } 813 /* 814 * It is valid for the chain not to be complete (because normally we 815 * don't include the root cert in the chain). Therefore we deliberately 816 * ignore the error return from this call. We're not actually verifying 817 * the cert - we're just building as much of the chain as we can 818 */ 819 (void)X509_verify_cert(xs_ctx); 820 /* Don't leave errors in the queue */ 821 ERR_clear_error(); 822 chain = X509_STORE_CTX_get0_chain(xs_ctx); 823 i = ssl_security_cert_chain(s, chain, NULL, 0); 824 if (i != 1) { 825 #if 0 826 /* Dummy error calls so mkerr generates them */ 827 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_EE_KEY_TOO_SMALL); 828 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_KEY_TOO_SMALL); 829 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, SSL_R_CA_MD_TOO_WEAK); 830 #endif 831 X509_STORE_CTX_free(xs_ctx); 832 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); 833 return 0; 834 } 835 chain_count = sk_X509_num(chain); 836 for (i = 0; i < chain_count; i++) { 837 x = sk_X509_value(chain, i); 838 839 if (!ssl_add_cert_to_buf(buf, l, x)) { 840 X509_STORE_CTX_free(xs_ctx); 841 return 0; 842 } 843 } 844 X509_STORE_CTX_free(xs_ctx); 845 } else { 846 i = ssl_security_cert_chain(s, extra_certs, x, 0); 847 if (i != 1) { 848 SSLerr(SSL_F_SSL_ADD_CERT_CHAIN, i); 849 return 0; 850 } 851 if (!ssl_add_cert_to_buf(buf, l, x)) 852 return 0; 853 for (i = 0; i < sk_X509_num(extra_certs); i++) { 854 x = sk_X509_value(extra_certs, i); 855 if (!ssl_add_cert_to_buf(buf, l, x)) 856 return 0; 857 } 858 } 859 return 1; 860 } 861 862 /* Build a certificate chain for current certificate */ 863 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags) 864 { 865 CERT *c = s ? s->cert : ctx->cert; 866 CERT_PKEY *cpk = c->key; 867 X509_STORE *chain_store = NULL; 868 X509_STORE_CTX *xs_ctx = NULL; 869 STACK_OF(X509) *chain = NULL, *untrusted = NULL; 870 X509 *x; 871 int i, rv = 0; 872 unsigned long error; 873 874 if (!cpk->x509) { 875 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET); 876 goto err; 877 } 878 /* Rearranging and check the chain: add everything to a store */ 879 if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) { 880 chain_store = X509_STORE_new(); 881 if (chain_store == NULL) 882 goto err; 883 for (i = 0; i < sk_X509_num(cpk->chain); i++) { 884 x = sk_X509_value(cpk->chain, i); 885 if (!X509_STORE_add_cert(chain_store, x)) { 886 error = ERR_peek_last_error(); 887 if (ERR_GET_LIB(error) != ERR_LIB_X509 || 888 ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) 889 goto err; 890 ERR_clear_error(); 891 } 892 } 893 /* Add EE cert too: it might be self signed */ 894 if (!X509_STORE_add_cert(chain_store, cpk->x509)) { 895 error = ERR_peek_last_error(); 896 if (ERR_GET_LIB(error) != ERR_LIB_X509 || 897 ERR_GET_REASON(error) != X509_R_CERT_ALREADY_IN_HASH_TABLE) 898 goto err; 899 ERR_clear_error(); 900 } 901 } else { 902 if (c->chain_store) 903 chain_store = c->chain_store; 904 else if (s) 905 chain_store = s->ctx->cert_store; 906 else 907 chain_store = ctx->cert_store; 908 909 if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED) 910 untrusted = cpk->chain; 911 } 912 913 xs_ctx = X509_STORE_CTX_new(); 914 if (xs_ctx == NULL) { 915 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE); 916 goto err; 917 } 918 if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) { 919 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB); 920 goto err; 921 } 922 /* Set suite B flags if needed */ 923 X509_STORE_CTX_set_flags(xs_ctx, 924 c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS); 925 926 i = X509_verify_cert(xs_ctx); 927 if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) { 928 if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR) 929 ERR_clear_error(); 930 i = 1; 931 rv = 2; 932 } 933 if (i > 0) 934 chain = X509_STORE_CTX_get1_chain(xs_ctx); 935 if (i <= 0) { 936 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED); 937 i = X509_STORE_CTX_get_error(xs_ctx); 938 ERR_add_error_data(2, "Verify error:", 939 X509_verify_cert_error_string(i)); 940 941 goto err; 942 } 943 /* Remove EE certificate from chain */ 944 x = sk_X509_shift(chain); 945 X509_free(x); 946 if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) { 947 if (sk_X509_num(chain) > 0) { 948 /* See if last cert is self signed */ 949 x = sk_X509_value(chain, sk_X509_num(chain) - 1); 950 if (X509_get_extension_flags(x) & EXFLAG_SS) { 951 x = sk_X509_pop(chain); 952 X509_free(x); 953 } 954 } 955 } 956 /* 957 * Check security level of all CA certificates: EE will have been checked 958 * already. 959 */ 960 for (i = 0; i < sk_X509_num(chain); i++) { 961 x = sk_X509_value(chain, i); 962 rv = ssl_security_cert(s, ctx, x, 0, 0); 963 if (rv != 1) { 964 SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv); 965 sk_X509_pop_free(chain, X509_free); 966 rv = 0; 967 goto err; 968 } 969 } 970 sk_X509_pop_free(cpk->chain, X509_free); 971 cpk->chain = chain; 972 if (rv == 0) 973 rv = 1; 974 err: 975 if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) 976 X509_STORE_free(chain_store); 977 X509_STORE_CTX_free(xs_ctx); 978 979 return rv; 980 } 981 982 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref) 983 { 984 X509_STORE **pstore; 985 if (chain) 986 pstore = &c->chain_store; 987 else 988 pstore = &c->verify_store; 989 X509_STORE_free(*pstore); 990 *pstore = store; 991 if (ref && store) 992 X509_STORE_up_ref(store); 993 return 1; 994 } 995 996 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx, 997 int op, int bits, int nid, void *other, 998 void *ex) 999 { 1000 int level, minbits; 1001 static const int minbits_table[5] = { 80, 112, 128, 192, 256 }; 1002 if (ctx) 1003 level = SSL_CTX_get_security_level(ctx); 1004 else 1005 level = SSL_get_security_level(s); 1006 1007 if (level <= 0) { 1008 /* 1009 * No EDH keys weaker than 1024-bits even at level 0, otherwise, 1010 * anything goes. 1011 */ 1012 if (op == SSL_SECOP_TMP_DH && bits < 80) 1013 return 0; 1014 return 1; 1015 } 1016 if (level > 5) 1017 level = 5; 1018 minbits = minbits_table[level - 1]; 1019 switch (op) { 1020 case SSL_SECOP_CIPHER_SUPPORTED: 1021 case SSL_SECOP_CIPHER_SHARED: 1022 case SSL_SECOP_CIPHER_CHECK: 1023 { 1024 const SSL_CIPHER *c = other; 1025 /* No ciphers below security level */ 1026 if (bits < minbits) 1027 return 0; 1028 /* No unauthenticated ciphersuites */ 1029 if (c->algorithm_auth & SSL_aNULL) 1030 return 0; 1031 /* No MD5 mac ciphersuites */ 1032 if (c->algorithm_mac & SSL_MD5) 1033 return 0; 1034 /* SHA1 HMAC is 160 bits of security */ 1035 if (minbits > 160 && c->algorithm_mac & SSL_SHA1) 1036 return 0; 1037 /* Level 2: no RC4 */ 1038 if (level >= 2 && c->algorithm_enc == SSL_RC4) 1039 return 0; 1040 /* Level 3: forward secure ciphersuites only */ 1041 if (level >= 3 && !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH))) 1042 return 0; 1043 break; 1044 } 1045 case SSL_SECOP_VERSION: 1046 if (!SSL_IS_DTLS(s)) { 1047 /* SSLv3 not allowed at level 2 */ 1048 if (nid <= SSL3_VERSION && level >= 2) 1049 return 0; 1050 /* TLS v1.1 and above only for level 3 */ 1051 if (nid <= TLS1_VERSION && level >= 3) 1052 return 0; 1053 /* TLS v1.2 only for level 4 and above */ 1054 if (nid <= TLS1_1_VERSION && level >= 4) 1055 return 0; 1056 } else { 1057 /* DTLS v1.2 only for level 4 and above */ 1058 if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4) 1059 return 0; 1060 } 1061 break; 1062 1063 case SSL_SECOP_COMPRESSION: 1064 if (level >= 2) 1065 return 0; 1066 break; 1067 case SSL_SECOP_TICKET: 1068 if (level >= 3) 1069 return 0; 1070 break; 1071 default: 1072 if (bits < minbits) 1073 return 0; 1074 } 1075 return 1; 1076 } 1077 1078 int ssl_security(const SSL *s, int op, int bits, int nid, void *other) 1079 { 1080 return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex); 1081 } 1082 1083 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other) 1084 { 1085 return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other, 1086 ctx->cert->sec_ex); 1087 } 1088