ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the Apache License 2.0 (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include <sys/types.h>
  13
  14 #include "internal/nelem.h"
  15 #include "internal/o_dir.h"
  16 #include <openssl/bio.h>
  17 #include <openssl/pem.h>
  18 #include <openssl/x509v3.h>
  19 #include <openssl/dh.h>
  20 #include <openssl/bn.h>
  21 #include <openssl/crypto.h>
  22 #include "internal/refcount.h"
  23 #include "ssl_locl.h"
  24 #include "ssl_cert_table.h"
  25 #include "internal/thread_once.h"
  26
  27 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
  28                                          int op, int bits, int nid, void *other,
  29                                          void *ex);
  30
  31 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
  32 static volatile int ssl_x509_store_ctx_idx = -1;
  33
  34 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
  35 {
  36     ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
  37                                                              "SSL for verify callback",
  38                                                              NULL, NULL, NULL);
  39     return ssl_x509_store_ctx_idx >= 0;
  40 }
  41
  42 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
  43 {
  44
  45     if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
  46         return -1;
  47     return ssl_x509_store_ctx_idx;
  48 }
  49
  50 CERT *ssl_cert_new(void)
  51 {
  52     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  53
  54     if (ret == NULL) {
  55         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  56         return NULL;
  57     }
  58
  59     ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
  60     ret->references = 1;
  61     ret->sec_cb = ssl_security_default_callback;
  62     ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
  63     ret->sec_ex = NULL;
  64     ret->lock = CRYPTO_THREAD_lock_new();
  65     if (ret->lock == NULL) {
  66         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  67         OPENSSL_free(ret);
  68         return NULL;
  69     }
  70
  71     return ret;
  72 }
  73
  74 CERT *ssl_cert_dup(CERT *cert)
  75 {
  76     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  77     int i;
  78
  79     if (ret == NULL) {
  80         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  81         return NULL;
  82     }
  83
  84     ret->references = 1;
  85     ret->key = &ret->pkeys[cert->key - cert->pkeys];
  86     ret->lock = CRYPTO_THREAD_lock_new();
  87     if (ret->lock == NULL) {
  88         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  89         OPENSSL_free(ret);
  90         return NULL;
  91     }
  92 #ifndef OPENSSL_NO_DH
  93     if (cert->dh_tmp != NULL) {
  94         ret->dh_tmp = cert->dh_tmp;
  95         EVP_PKEY_up_ref(ret->dh_tmp);
  96     }
  97     ret->dh_tmp_cb = cert->dh_tmp_cb;
  98     ret->dh_tmp_auto = cert->dh_tmp_auto;
  99 #endif
 100
 101     for (i = 0; i < SSL_PKEY_NUM; i++) {
 102         CERT_PKEY *cpk = cert->pkeys + i;
 103         CERT_PKEY *rpk = ret->pkeys + i;
 104         if (cpk->x509 != NULL) {
 105             rpk->x509 = cpk->x509;
 106             X509_up_ref(rpk->x509);
 107         }
 108
 109         if (cpk->privatekey != NULL) {
 110             rpk->privatekey = cpk->privatekey;
 111             EVP_PKEY_up_ref(cpk->privatekey);
 112         }
 113
 114         if (cpk->chain) {
 115             rpk->chain = X509_chain_up_ref(cpk->chain);
 116             if (!rpk->chain) {
 117                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 118                 goto err;
 119             }
 120         }
 121         if (cert->pkeys[i].serverinfo != NULL) {
 122             /* Just copy everything. */
 123             ret->pkeys[i].serverinfo =
 124                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
 125             if (ret->pkeys[i].serverinfo == NULL) {
 126                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 127                 goto err;
 128             }
 129             ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
 130             memcpy(ret->pkeys[i].serverinfo,
 131                    cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
 132         }
 133     }
 134
 135     /* Configured sigalgs copied across */
 136     if (cert->conf_sigalgs) {
 137         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
 138                                            * sizeof(*cert->conf_sigalgs));
 139         if (ret->conf_sigalgs == NULL)
 140             goto err;
 141         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
 142                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
 143         ret->conf_sigalgslen = cert->conf_sigalgslen;
 144     } else
 145         ret->conf_sigalgs = NULL;
 146
 147     if (cert->client_sigalgs) {
 148         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
 149                                              * sizeof(*cert->client_sigalgs));
 150         if (ret->client_sigalgs == NULL)
 151             goto err;
 152         memcpy(ret->client_sigalgs, cert->client_sigalgs,
 153                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
 154         ret->client_sigalgslen = cert->client_sigalgslen;
 155     } else
 156         ret->client_sigalgs = NULL;
 157     /* Copy any custom client certificate types */
 158     if (cert->ctype) {
 159         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
 160         if (ret->ctype == NULL)
 161             goto err;
 162         ret->ctype_len = cert->ctype_len;
 163     }
 164
 165     ret->cert_flags = cert->cert_flags;
 166
 167     ret->cert_cb = cert->cert_cb;
 168     ret->cert_cb_arg = cert->cert_cb_arg;
 169
 170     if (cert->verify_store) {
 171         X509_STORE_up_ref(cert->verify_store);
 172         ret->verify_store = cert->verify_store;
 173     }
 174
 175     if (cert->chain_store) {
 176         X509_STORE_up_ref(cert->chain_store);
 177         ret->chain_store = cert->chain_store;
 178     }
 179
 180     ret->sec_cb = cert->sec_cb;
 181     ret->sec_level = cert->sec_level;
 182     ret->sec_ex = cert->sec_ex;
 183
 184     if (!custom_exts_copy(&ret->custext, &cert->custext))
 185         goto err;
 186 #ifndef OPENSSL_NO_PSK
 187     if (cert->psk_identity_hint) {
 188         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
 189         if (ret->psk_identity_hint == NULL)
 190             goto err;
 191     }
 192 #endif
 193     return ret;
 194
 195  err:
 196     ssl_cert_free(ret);
 197
 198     return NULL;
 199 }
 200
 201 /* Free up and clear all certificates and chains */
 202
 203 void ssl_cert_clear_certs(CERT *c)
 204 {
 205     int i;
 206     if (c == NULL)
 207         return;
 208     for (i = 0; i < SSL_PKEY_NUM; i++) {
 209         CERT_PKEY *cpk = c->pkeys + i;
 210         X509_free(cpk->x509);
 211         cpk->x509 = NULL;
 212         EVP_PKEY_free(cpk->privatekey);
 213         cpk->privatekey = NULL;
 214         sk_X509_pop_free(cpk->chain, X509_free);
 215         cpk->chain = NULL;
 216         OPENSSL_free(cpk->serverinfo);
 217         cpk->serverinfo = NULL;
 218         cpk->serverinfo_length = 0;
 219     }
 220 }
 221
 222 void ssl_cert_free(CERT *c)
 223 {
 224     int i;
 225
 226     if (c == NULL)
 227         return;
 228     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
 229     REF_PRINT_COUNT("CERT", c);
 230     if (i > 0)
 231         return;
 232     REF_ASSERT_ISNT(i < 0);
 233
 234 #ifndef OPENSSL_NO_DH
 235     EVP_PKEY_free(c->dh_tmp);
 236 #endif
 237
 238     ssl_cert_clear_certs(c);
 239     OPENSSL_free(c->conf_sigalgs);
 240     OPENSSL_free(c->client_sigalgs);
 241     OPENSSL_free(c->ctype);
 242     X509_STORE_free(c->verify_store);
 243     X509_STORE_free(c->chain_store);
 244     custom_exts_free(&c->custext);
 245 #ifndef OPENSSL_NO_PSK
 246     OPENSSL_free(c->psk_identity_hint);
 247 #endif
 248     CRYPTO_THREAD_lock_free(c->lock);
 249     OPENSSL_free(c);
 250 }
 251
 252 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 253 {
 254     int i, r;
 255     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 256     if (!cpk)
 257         return 0;
 258     for (i = 0; i < sk_X509_num(chain); i++) {
 259         r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
 260         if (r != 1) {
 261             SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
 262             return 0;
 263         }
 264     }
 265     sk_X509_pop_free(cpk->chain, X509_free);
 266     cpk->chain = chain;
 267     return 1;
 268 }
 269
 270 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 271 {
 272     STACK_OF(X509) *dchain;
 273     if (!chain)
 274         return ssl_cert_set0_chain(s, ctx, NULL);
 275     dchain = X509_chain_up_ref(chain);
 276     if (!dchain)
 277         return 0;
 278     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 279         sk_X509_pop_free(dchain, X509_free);
 280         return 0;
 281     }
 282     return 1;
 283 }
 284
 285 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 286 {
 287     int r;
 288     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 289     if (!cpk)
 290         return 0;
 291     r = ssl_security_cert(s, ctx, x, 0, 0);
 292     if (r != 1) {
 293         SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
 294         return 0;
 295     }
 296     if (!cpk->chain)
 297         cpk->chain = sk_X509_new_null();
 298     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 299         return 0;
 300     return 1;
 301 }
 302
 303 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 304 {
 305     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 306         return 0;
 307     X509_up_ref(x);
 308     return 1;
 309 }
 310
 311 int ssl_cert_select_current(CERT *c, X509 *x)
 312 {
 313     int i;
 314     if (x == NULL)
 315         return 0;
 316     for (i = 0; i < SSL_PKEY_NUM; i++) {
 317         CERT_PKEY *cpk = c->pkeys + i;
 318         if (cpk->x509 == x && cpk->privatekey) {
 319             c->key = cpk;
 320             return 1;
 321         }
 322     }
 323
 324     for (i = 0; i < SSL_PKEY_NUM; i++) {
 325         CERT_PKEY *cpk = c->pkeys + i;
 326         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 327             c->key = cpk;
 328             return 1;
 329         }
 330     }
 331     return 0;
 332 }
 333
 334 int ssl_cert_set_current(CERT *c, long op)
 335 {
 336     int i, idx;
 337     if (!c)
 338         return 0;
 339     if (op == SSL_CERT_SET_FIRST)
 340         idx = 0;
 341     else if (op == SSL_CERT_SET_NEXT) {
 342         idx = (int)(c->key - c->pkeys + 1);
 343         if (idx >= SSL_PKEY_NUM)
 344             return 0;
 345     } else
 346         return 0;
 347     for (i = idx; i < SSL_PKEY_NUM; i++) {
 348         CERT_PKEY *cpk = c->pkeys + i;
 349         if (cpk->x509 && cpk->privatekey) {
 350             c->key = cpk;
 351             return 1;
 352         }
 353     }
 354     return 0;
 355 }
 356
 357 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 358 {
 359     c->cert_cb = cb;
 360     c->cert_cb_arg = arg;
 361 }
 362
 363 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
 364 {
 365     X509 *x;
 366     int i = 0;
 367     X509_STORE *verify_store;
 368     X509_STORE_CTX *ctx = NULL;
 369     X509_VERIFY_PARAM *param;
 370
 371     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 372         return 0;
 373
 374     if (s->cert->verify_store)
 375         verify_store = s->cert->verify_store;
 376     else
 377         verify_store = s->ctx->cert_store;
 378
 379     ctx = X509_STORE_CTX_new();
 380     if (ctx == NULL) {
 381         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 382         return 0;
 383     }
 384
 385     x = sk_X509_value(sk, 0);
 386     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 387         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
 388         goto end;
 389     }
 390     param = X509_STORE_CTX_get0_param(ctx);
 391     /*
 392      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 393      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 394      * and PKI authentication.
 395      */
 396     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
 397
 398     /* Set suite B flags if needed */
 399     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 400     if (!X509_STORE_CTX_set_ex_data
 401         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 402         goto end;
 403     }
 404
 405     /* Verify via DANE if enabled */
 406     if (DANETLS_ENABLED(&s->dane))
 407         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 408
 409     /*
 410      * We need to inherit the verify parameters. These can be determined by
 411      * the context: if its a server it will verify SSL client certificates or
 412      * vice versa.
 413      */
 414
 415     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 416     /*
 417      * Anything non-default in "s->param" should overwrite anything in the ctx.
 418      */
 419     X509_VERIFY_PARAM_set1(param, s->param);
 420
 421     if (s->verify_callback)
 422         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 423
 424     if (s->ctx->app_verify_callback != NULL)
 425         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
 426     else
 427         i = X509_verify_cert(ctx);
 428
 429     s->verify_result = X509_STORE_CTX_get_error(ctx);
 430     sk_X509_pop_free(s->verified_chain, X509_free);
 431     s->verified_chain = NULL;
 432     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 433         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 434         if (s->verified_chain == NULL) {
 435             SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 436             i = 0;
 437         }
 438     }
 439
 440     /* Move peername from the store context params to the SSL handle's */
 441     X509_VERIFY_PARAM_move_peername(s->param, param);
 442
 443  end:
 444     X509_STORE_CTX_free(ctx);
 445     return i;
 446 }
 447
 448 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 449                         STACK_OF(X509_NAME) *name_list)
 450 {
 451     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 452     *ca_list = name_list;
 453 }
 454
 455 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 456 {
 457     int i;
 458     const int num = sk_X509_NAME_num(sk);
 459     STACK_OF(X509_NAME) *ret;
 460     X509_NAME *name;
 461
 462     ret = sk_X509_NAME_new_reserve(NULL, num);
 463     if (ret == NULL) {
 464         SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 465         return NULL;
 466     }
 467     for (i = 0; i < num; i++) {
 468         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 469         if (name == NULL) {
 470             SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 471             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 472             return NULL;
 473         }
 474         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 475     }
 476     return ret;
 477 }
 478
 479 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 480 {
 481     set0_CA_list(&s->ca_names, name_list);
 482 }
 483
 484 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 485 {
 486     set0_CA_list(&ctx->ca_names, name_list);
 487 }
 488
 489 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 490 {
 491     return ctx->ca_names;
 492 }
 493
 494 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 495 {
 496     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 497 }
 498
 499 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 500 {
 501     set0_CA_list(&ctx->client_ca_names, name_list);
 502 }
 503
 504 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 505 {
 506     return ctx->client_ca_names;
 507 }
 508
 509 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 510 {
 511     set0_CA_list(&s->client_ca_names, name_list);
 512 }
 513
 514 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 515 {
 516     return s->s3.tmp.peer_ca_names;
 517 }
 518
 519 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 520 {
 521     if (!s->server)
 522         return s->s3.tmp.peer_ca_names;
 523     return s->client_ca_names != NULL ?  s->client_ca_names
 524                                       : s->ctx->client_ca_names;
 525 }
 526
 527 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 528 {
 529     X509_NAME *name;
 530
 531     if (x == NULL)
 532         return 0;
 533     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 534         return 0;
 535
 536     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 537         return 0;
 538
 539     if (!sk_X509_NAME_push(*sk, name)) {
 540         X509_NAME_free(name);
 541         return 0;
 542     }
 543     return 1;
 544 }
 545
 546 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 547 {
 548     return add_ca_name(&ssl->ca_names, x);
 549 }
 550
 551 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 552 {
 553     return add_ca_name(&ctx->ca_names, x);
 554 }
 555
 556 /*
 557  * The following two are older names are to be replaced with
 558  * SSL(_CTX)_add1_to_CA_list
 559  */
 560 int SSL_add_client_CA(SSL *ssl, X509 *x)
 561 {
 562     return add_ca_name(&ssl->client_ca_names, x);
 563 }
 564
 565 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 566 {
 567     return add_ca_name(&ctx->client_ca_names, x);
 568 }
 569
 570 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 571 {
 572     unsigned char *abuf = NULL, *bbuf = NULL;
 573     int alen, blen, ret;
 574
 575     /* X509_NAME_cmp() itself casts away constness in this way, so
 576      * assume it's safe:
 577      */
 578     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 579     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 580
 581     if (alen < 0 || blen < 0)
 582         ret = -2;
 583     else if (alen != blen)
 584         ret = alen - blen;
 585     else /* alen == blen */
 586         ret = memcmp(abuf, bbuf, alen);
 587
 588     OPENSSL_free(abuf);
 589     OPENSSL_free(bbuf);
 590
 591     return ret;
 592 }
 593
 594 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 595 {
 596     return xname_cmp(*a, *b);
 597 }
 598
 599 static unsigned long xname_hash(const X509_NAME *a)
 600 {
 601     return X509_NAME_hash((X509_NAME *)a);
 602 }
 603
 604 /**
 605  * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 606  * it doesn't really have anything to do with clients (except that a common use
 607  * for a stack of CAs is to send it to the client). Actually, it doesn't have
 608  * much to do with CAs, either, since it will load any old cert.
 609  * \param file the file containing one or more certs.
 610  * \return a ::STACK containing the certs.
 611  */
 612 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 613 {
 614     BIO *in = BIO_new(BIO_s_file());
 615     X509 *x = NULL;
 616     X509_NAME *xn = NULL;
 617     STACK_OF(X509_NAME) *ret = NULL;
 618     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 619
 620     if ((name_hash == NULL) || (in == NULL)) {
 621         SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 622         goto err;
 623     }
 624
 625     if (!BIO_read_filename(in, file))
 626         goto err;
 627
 628     for (;;) {
 629         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 630             break;
 631         if (ret == NULL) {
 632             ret = sk_X509_NAME_new_null();
 633             if (ret == NULL) {
 634                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 635                 goto err;
 636             }
 637         }
 638         if ((xn = X509_get_subject_name(x)) == NULL)
 639             goto err;
 640         /* check for duplicates */
 641         xn = X509_NAME_dup(xn);
 642         if (xn == NULL)
 643             goto err;
 644         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 645             /* Duplicate. */
 646             X509_NAME_free(xn);
 647             xn = NULL;
 648         } else {
 649             lh_X509_NAME_insert(name_hash, xn);
 650             if (!sk_X509_NAME_push(ret, xn))
 651                 goto err;
 652         }
 653     }
 654     goto done;
 655
 656  err:
 657     X509_NAME_free(xn);
 658     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 659     ret = NULL;
 660  done:
 661     BIO_free(in);
 662     X509_free(x);
 663     lh_X509_NAME_free(name_hash);
 664     if (ret != NULL)
 665         ERR_clear_error();
 666     return ret;
 667 }
 668
 669 /**
 670  * Add a file of certs to a stack.
 671  * \param stack the stack to add to.
 672  * \param file the file to add from. All certs in this file that are not
 673  * already in the stack will be added.
 674  * \return 1 for success, 0 for failure. Note that in the case of failure some
 675  * certs may have been added to \c stack.
 676  */
 677
 678 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 679                                         const char *file)
 680 {
 681     BIO *in;
 682     X509 *x = NULL;
 683     X509_NAME *xn = NULL;
 684     int ret = 1;
 685     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 686
 687     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 688
 689     in = BIO_new(BIO_s_file());
 690
 691     if (in == NULL) {
 692         SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
 693         goto err;
 694     }
 695
 696     if (!BIO_read_filename(in, file))
 697         goto err;
 698
 699     for (;;) {
 700         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 701             break;
 702         if ((xn = X509_get_subject_name(x)) == NULL)
 703             goto err;
 704         xn = X509_NAME_dup(xn);
 705         if (xn == NULL)
 706             goto err;
 707         if (sk_X509_NAME_find(stack, xn) >= 0) {
 708             /* Duplicate. */
 709             X509_NAME_free(xn);
 710         } else if (!sk_X509_NAME_push(stack, xn)) {
 711             X509_NAME_free(xn);
 712             goto err;
 713         }
 714     }
 715
 716     ERR_clear_error();
 717     goto done;
 718
 719  err:
 720     ret = 0;
 721  done:
 722     BIO_free(in);
 723     X509_free(x);
 724     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 725     return ret;
 726 }
 727
 728 /**
 729  * Add a directory of certs to a stack.
 730  * \param stack the stack to append to.
 731  * \param dir the directory to append from. All files in this directory will be
 732  * examined as potential certs. Any that are acceptable to
 733  * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
 734  * included.
 735  * \return 1 for success, 0 for failure. Note that in the case of failure some
 736  * certs may have been added to \c stack.
 737  */
 738
 739 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 740                                        const char *dir)
 741 {
 742     OPENSSL_DIR_CTX *d = NULL;
 743     const char *filename;
 744     int ret = 0;
 745
 746     /* Note that a side effect is that the CAs will be sorted by name */
 747
 748     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 749         char buf[1024];
 750         int r;
 751
 752         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 753             SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
 754                    SSL_R_PATH_TOO_LONG);
 755             goto err;
 756         }
 757 #ifdef OPENSSL_SYS_VMS
 758         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 759 #else
 760         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 761 #endif
 762         if (r <= 0 || r >= (int)sizeof(buf))
 763             goto err;
 764         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 765             goto err;
 766     }
 767
 768     if (errno) {
 769         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 770                        "calling OPENSSL_dir_read(%s)",
 771                        dir);
 772         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
 773         goto err;
 774     }
 775
 776     ret = 1;
 777
 778  err:
 779     if (d)
 780         OPENSSL_DIR_end(&d);
 781
 782     return ret;
 783 }
 784
 785 /* Build a certificate chain for current certificate */
 786 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 787 {
 788     CERT *c = s ? s->cert : ctx->cert;
 789     CERT_PKEY *cpk = c->key;
 790     X509_STORE *chain_store = NULL;
 791     X509_STORE_CTX *xs_ctx = NULL;
 792     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 793     X509 *x;
 794     int i, rv = 0;
 795
 796     if (!cpk->x509) {
 797         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
 798         goto err;
 799     }
 800     /* Rearranging and check the chain: add everything to a store */
 801     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 802         chain_store = X509_STORE_new();
 803         if (chain_store == NULL)
 804             goto err;
 805         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 806             x = sk_X509_value(cpk->chain, i);
 807             if (!X509_STORE_add_cert(chain_store, x))
 808                 goto err;
 809         }
 810         /* Add EE cert too: it might be self signed */
 811         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 812             goto err;
 813     } else {
 814         if (c->chain_store)
 815             chain_store = c->chain_store;
 816         else if (s)
 817             chain_store = s->ctx->cert_store;
 818         else
 819             chain_store = ctx->cert_store;
 820
 821         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 822             untrusted = cpk->chain;
 823     }
 824
 825     xs_ctx = X509_STORE_CTX_new();
 826     if (xs_ctx == NULL) {
 827         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 828         goto err;
 829     }
 830     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 831         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
 832         goto err;
 833     }
 834     /* Set suite B flags if needed */
 835     X509_STORE_CTX_set_flags(xs_ctx,
 836                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 837
 838     i = X509_verify_cert(xs_ctx);
 839     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 840         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 841             ERR_clear_error();
 842         i = 1;
 843         rv = 2;
 844     }
 845     if (i > 0)
 846         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 847     if (i <= 0) {
 848         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
 849         i = X509_STORE_CTX_get_error(xs_ctx);
 850         ERR_add_error_data(2, "Verify error:",
 851                            X509_verify_cert_error_string(i));
 852
 853         goto err;
 854     }
 855     /* Remove EE certificate from chain */
 856     x = sk_X509_shift(chain);
 857     X509_free(x);
 858     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 859         if (sk_X509_num(chain) > 0) {
 860             /* See if last cert is self signed */
 861             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 862             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 863                 x = sk_X509_pop(chain);
 864                 X509_free(x);
 865             }
 866         }
 867     }
 868     /*
 869      * Check security level of all CA certificates: EE will have been checked
 870      * already.
 871      */
 872     for (i = 0; i < sk_X509_num(chain); i++) {
 873         x = sk_X509_value(chain, i);
 874         rv = ssl_security_cert(s, ctx, x, 0, 0);
 875         if (rv != 1) {
 876             SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
 877             sk_X509_pop_free(chain, X509_free);
 878             rv = 0;
 879             goto err;
 880         }
 881     }
 882     sk_X509_pop_free(cpk->chain, X509_free);
 883     cpk->chain = chain;
 884     if (rv == 0)
 885         rv = 1;
 886  err:
 887     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 888         X509_STORE_free(chain_store);
 889     X509_STORE_CTX_free(xs_ctx);
 890
 891     return rv;
 892 }
 893
 894 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 895 {
 896     X509_STORE **pstore;
 897     if (chain)
 898         pstore = &c->chain_store;
 899     else
 900         pstore = &c->verify_store;
 901     X509_STORE_free(*pstore);
 902     *pstore = store;
 903     if (ref && store)
 904         X509_STORE_up_ref(store);
 905     return 1;
 906 }
 907
 908 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 909                                          int op, int bits, int nid, void *other,
 910                                          void *ex)
 911 {
 912     int level, minbits;
 913     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 914     if (ctx)
 915         level = SSL_CTX_get_security_level(ctx);
 916     else
 917         level = SSL_get_security_level(s);
 918
 919     if (level <= 0) {
 920         /*
 921          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 922          * anything goes.
 923          */
 924         if (op == SSL_SECOP_TMP_DH && bits < 80)
 925             return 0;
 926         return 1;
 927     }
 928     if (level > 5)
 929         level = 5;
 930     minbits = minbits_table[level - 1];
 931     switch (op) {
 932     case SSL_SECOP_CIPHER_SUPPORTED:
 933     case SSL_SECOP_CIPHER_SHARED:
 934     case SSL_SECOP_CIPHER_CHECK:
 935         {
 936             const SSL_CIPHER *c = other;
 937             /* No ciphers below security level */
 938             if (bits < minbits)
 939                 return 0;
 940             /* No unauthenticated ciphersuites */
 941             if (c->algorithm_auth & SSL_aNULL)
 942                 return 0;
 943             /* No MD5 mac ciphersuites */
 944             if (c->algorithm_mac & SSL_MD5)
 945                 return 0;
 946             /* SHA1 HMAC is 160 bits of security */
 947             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
 948                 return 0;
 949             /* Level 2: no RC4 */
 950             if (level >= 2 && c->algorithm_enc == SSL_RC4)
 951                 return 0;
 952             /* Level 3: forward secure ciphersuites only */
 953             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
 954                                !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
 955                 return 0;
 956             break;
 957         }
 958     case SSL_SECOP_VERSION:
 959         if (!SSL_IS_DTLS(s)) {
 960             /* SSLv3 not allowed at level 2 */
 961             if (nid <= SSL3_VERSION && level >= 2)
 962                 return 0;
 963             /* TLS v1.1 and above only for level 3 */
 964             if (nid <= TLS1_VERSION && level >= 3)
 965                 return 0;
 966             /* TLS v1.2 only for level 4 and above */
 967             if (nid <= TLS1_1_VERSION && level >= 4)
 968                 return 0;
 969         } else {
 970             /* DTLS v1.2 only for level 4 and above */
 971             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
 972                 return 0;
 973         }
 974         break;
 975
 976     case SSL_SECOP_COMPRESSION:
 977         if (level >= 2)
 978             return 0;
 979         break;
 980     case SSL_SECOP_TICKET:
 981         if (level >= 3)
 982             return 0;
 983         break;
 984     default:
 985         if (bits < minbits)
 986             return 0;
 987     }
 988     return 1;
 989 }
 990
 991 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
 992 {
 993     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
 994 }
 995
 996 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
 997 {
 998     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
 999                              ctx->cert->sec_ex);
1000 }
1001
1002 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1003 {
1004     size_t i;
1005
1006     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1007         if (ssl_cert_info[i].nid == nid) {
1008             *pidx = i;
1009             return 1;
1010         }
1011     }
1012
1013     return 0;
1014 }
1015
1016 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1017 {
1018     int nid = EVP_PKEY_id(pk);
1019     size_t tmpidx;
1020
1021     if (nid == NID_undef)
1022         return NULL;
1023
1024     if (!ssl_cert_lookup_by_nid(nid, &tmpidx))
1025         return NULL;
1026
1027     if (pidx != NULL)
1028         *pidx = tmpidx;
1029
1030     return &ssl_cert_info[tmpidx];
1031 }
1032
1033 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1034 {
1035     if (idx >= OSSL_NELEM(ssl_cert_info))
1036         return NULL;
1037     return &ssl_cert_info[idx];
1038 }