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 OpenSSL license (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     /* Shared sigalgs also NULL */
 158     ret->shared_sigalgs = NULL;
 159     /* Copy any custom client certificate types */
 160     if (cert->ctype) {
 161         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
 162         if (ret->ctype == NULL)
 163             goto err;
 164         ret->ctype_len = cert->ctype_len;
 165     }
 166
 167     ret->cert_flags = cert->cert_flags;
 168
 169     ret->cert_cb = cert->cert_cb;
 170     ret->cert_cb_arg = cert->cert_cb_arg;
 171
 172     if (cert->verify_store) {
 173         X509_STORE_up_ref(cert->verify_store);
 174         ret->verify_store = cert->verify_store;
 175     }
 176
 177     if (cert->chain_store) {
 178         X509_STORE_up_ref(cert->chain_store);
 179         ret->chain_store = cert->chain_store;
 180     }
 181
 182     ret->sec_cb = cert->sec_cb;
 183     ret->sec_level = cert->sec_level;
 184     ret->sec_ex = cert->sec_ex;
 185
 186     if (!custom_exts_copy(&ret->custext, &cert->custext))
 187         goto err;
 188 #ifndef OPENSSL_NO_PSK
 189     if (cert->psk_identity_hint) {
 190         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
 191         if (ret->psk_identity_hint == NULL)
 192             goto err;
 193     }
 194 #endif
 195     return ret;
 196
 197  err:
 198     ssl_cert_free(ret);
 199
 200     return NULL;
 201 }
 202
 203 /* Free up and clear all certificates and chains */
 204
 205 void ssl_cert_clear_certs(CERT *c)
 206 {
 207     int i;
 208     if (c == NULL)
 209         return;
 210     for (i = 0; i < SSL_PKEY_NUM; i++) {
 211         CERT_PKEY *cpk = c->pkeys + i;
 212         X509_free(cpk->x509);
 213         cpk->x509 = NULL;
 214         EVP_PKEY_free(cpk->privatekey);
 215         cpk->privatekey = NULL;
 216         sk_X509_pop_free(cpk->chain, X509_free);
 217         cpk->chain = NULL;
 218         OPENSSL_free(cpk->serverinfo);
 219         cpk->serverinfo = NULL;
 220         cpk->serverinfo_length = 0;
 221     }
 222 }
 223
 224 void ssl_cert_free(CERT *c)
 225 {
 226     int i;
 227
 228     if (c == NULL)
 229         return;
 230     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
 231     REF_PRINT_COUNT("CERT", c);
 232     if (i > 0)
 233         return;
 234     REF_ASSERT_ISNT(i < 0);
 235
 236 #ifndef OPENSSL_NO_DH
 237     EVP_PKEY_free(c->dh_tmp);
 238 #endif
 239
 240     ssl_cert_clear_certs(c);
 241     OPENSSL_free(c->conf_sigalgs);
 242     OPENSSL_free(c->client_sigalgs);
 243     OPENSSL_free(c->shared_sigalgs);
 244     OPENSSL_free(c->ctype);
 245     X509_STORE_free(c->verify_store);
 246     X509_STORE_free(c->chain_store);
 247     custom_exts_free(&c->custext);
 248 #ifndef OPENSSL_NO_PSK
 249     OPENSSL_free(c->psk_identity_hint);
 250 #endif
 251     CRYPTO_THREAD_lock_free(c->lock);
 252     OPENSSL_free(c);
 253 }
 254
 255 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 256 {
 257     int i, r;
 258     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 259     if (!cpk)
 260         return 0;
 261     for (i = 0; i < sk_X509_num(chain); i++) {
 262         r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
 263         if (r != 1) {
 264             SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
 265             return 0;
 266         }
 267     }
 268     sk_X509_pop_free(cpk->chain, X509_free);
 269     cpk->chain = chain;
 270     return 1;
 271 }
 272
 273 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 274 {
 275     STACK_OF(X509) *dchain;
 276     if (!chain)
 277         return ssl_cert_set0_chain(s, ctx, NULL);
 278     dchain = X509_chain_up_ref(chain);
 279     if (!dchain)
 280         return 0;
 281     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 282         sk_X509_pop_free(dchain, X509_free);
 283         return 0;
 284     }
 285     return 1;
 286 }
 287
 288 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 289 {
 290     int r;
 291     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 292     if (!cpk)
 293         return 0;
 294     r = ssl_security_cert(s, ctx, x, 0, 0);
 295     if (r != 1) {
 296         SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
 297         return 0;
 298     }
 299     if (!cpk->chain)
 300         cpk->chain = sk_X509_new_null();
 301     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 302         return 0;
 303     return 1;
 304 }
 305
 306 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 307 {
 308     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 309         return 0;
 310     X509_up_ref(x);
 311     return 1;
 312 }
 313
 314 int ssl_cert_select_current(CERT *c, X509 *x)
 315 {
 316     int i;
 317     if (x == NULL)
 318         return 0;
 319     for (i = 0; i < SSL_PKEY_NUM; i++) {
 320         CERT_PKEY *cpk = c->pkeys + i;
 321         if (cpk->x509 == x && cpk->privatekey) {
 322             c->key = cpk;
 323             return 1;
 324         }
 325     }
 326
 327     for (i = 0; i < SSL_PKEY_NUM; i++) {
 328         CERT_PKEY *cpk = c->pkeys + i;
 329         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 330             c->key = cpk;
 331             return 1;
 332         }
 333     }
 334     return 0;
 335 }
 336
 337 int ssl_cert_set_current(CERT *c, long op)
 338 {
 339     int i, idx;
 340     if (!c)
 341         return 0;
 342     if (op == SSL_CERT_SET_FIRST)
 343         idx = 0;
 344     else if (op == SSL_CERT_SET_NEXT) {
 345         idx = (int)(c->key - c->pkeys + 1);
 346         if (idx >= SSL_PKEY_NUM)
 347             return 0;
 348     } else
 349         return 0;
 350     for (i = idx; i < SSL_PKEY_NUM; i++) {
 351         CERT_PKEY *cpk = c->pkeys + i;
 352         if (cpk->x509 && cpk->privatekey) {
 353             c->key = cpk;
 354             return 1;
 355         }
 356     }
 357     return 0;
 358 }
 359
 360 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 361 {
 362     c->cert_cb = cb;
 363     c->cert_cb_arg = arg;
 364 }
 365
 366 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
 367 {
 368     X509 *x;
 369     int i = 0;
 370     X509_STORE *verify_store;
 371     X509_STORE_CTX *ctx = NULL;
 372     X509_VERIFY_PARAM *param;
 373
 374     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 375         return 0;
 376
 377     if (s->cert->verify_store)
 378         verify_store = s->cert->verify_store;
 379     else
 380         verify_store = s->ctx->cert_store;
 381
 382     ctx = X509_STORE_CTX_new();
 383     if (ctx == NULL) {
 384         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 385         return 0;
 386     }
 387
 388     x = sk_X509_value(sk, 0);
 389     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 390         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
 391         goto end;
 392     }
 393     param = X509_STORE_CTX_get0_param(ctx);
 394     /*
 395      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 396      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 397      * and PKI authentication.
 398      */
 399     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
 400
 401     /* Set suite B flags if needed */
 402     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 403     if (!X509_STORE_CTX_set_ex_data
 404         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 405         goto end;
 406     }
 407
 408     /* Verify via DANE if enabled */
 409     if (DANETLS_ENABLED(&s->dane))
 410         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 411
 412     /*
 413      * We need to inherit the verify parameters. These can be determined by
 414      * the context: if its a server it will verify SSL client certificates or
 415      * vice versa.
 416      */
 417
 418     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 419     /*
 420      * Anything non-default in "s->param" should overwrite anything in the ctx.
 421      */
 422     X509_VERIFY_PARAM_set1(param, s->param);
 423
 424     if (s->verify_callback)
 425         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 426
 427     if (s->ctx->app_verify_callback != NULL)
 428         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
 429     else
 430         i = X509_verify_cert(ctx);
 431
 432     s->verify_result = X509_STORE_CTX_get_error(ctx);
 433     sk_X509_pop_free(s->verified_chain, X509_free);
 434     s->verified_chain = NULL;
 435     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 436         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 437         if (s->verified_chain == NULL) {
 438             SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 439             i = 0;
 440         }
 441     }
 442
 443     /* Move peername from the store context params to the SSL handle's */
 444     X509_VERIFY_PARAM_move_peername(s->param, param);
 445
 446  end:
 447     X509_STORE_CTX_free(ctx);
 448     return i;
 449 }
 450
 451 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 452                         STACK_OF(X509_NAME) *name_list)
 453 {
 454     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 455     *ca_list = name_list;
 456 }
 457
 458 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 459 {
 460     int i;
 461     const int num = sk_X509_NAME_num(sk);
 462     STACK_OF(X509_NAME) *ret;
 463     X509_NAME *name;
 464
 465     ret = sk_X509_NAME_new_reserve(NULL, num);
 466     if (ret == NULL) {
 467         SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 468         return NULL;
 469     }
 470     for (i = 0; i < num; i++) {
 471         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 472         if (name == NULL) {
 473             SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 474             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 475             return NULL;
 476         }
 477         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 478     }
 479     return ret;
 480 }
 481
 482 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 483 {
 484     set0_CA_list(&s->ca_names, name_list);
 485 }
 486
 487 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 488 {
 489     set0_CA_list(&ctx->ca_names, name_list);
 490 }
 491
 492 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 493 {
 494     return ctx->ca_names;
 495 }
 496
 497 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 498 {
 499     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 500 }
 501
 502 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 503 {
 504     SSL_CTX_set0_CA_list(ctx, name_list);
 505 }
 506
 507 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 508 {
 509     return ctx->ca_names;
 510 }
 511
 512 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 513 {
 514     SSL_set0_CA_list(s, name_list);
 515 }
 516
 517 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 518 {
 519     return s->s3 != NULL ? s->s3->tmp.peer_ca_names : NULL;
 520 }
 521
 522 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 523 {
 524     if (!s->server)
 525         return s->s3 != NULL ?  s->s3->tmp.peer_ca_names : NULL;
 526     return s->ca_names != NULL ?  s->ca_names : s->ctx->ca_names;
 527 }
 528
 529 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 530 {
 531     X509_NAME *name;
 532
 533     if (x == NULL)
 534         return 0;
 535     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 536         return 0;
 537
 538     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 539         return 0;
 540
 541     if (!sk_X509_NAME_push(*sk, name)) {
 542         X509_NAME_free(name);
 543         return 0;
 544     }
 545     return 1;
 546 }
 547
 548 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 549 {
 550     return add_ca_name(&ssl->ca_names, x);
 551 }
 552
 553 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 554 {
 555     return add_ca_name(&ctx->ca_names, x);
 556 }
 557
 558 /*
 559  * The following two are older names are to be replaced with
 560  * SSL(_CTX)_add1_to_CA_list
 561  */
 562 int SSL_add_client_CA(SSL *ssl, X509 *x)
 563 {
 564     return add_ca_name(&ssl->ca_names, x);
 565 }
 566
 567 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 568 {
 569     return add_ca_name(&ctx->ca_names, x);
 570 }
 571
 572 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 573 {
 574     unsigned char *abuf = NULL, *bbuf = NULL;
 575     int alen, blen, ret;
 576
 577     /* X509_NAME_cmp() itself casts away constness in this way, so
 578      * assume it's safe:
 579      */
 580     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 581     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 582
 583     if (alen < 0 || blen < 0)
 584         ret = -2;
 585     else if (alen != blen)
 586         ret = alen - blen;
 587     else /* alen == blen */
 588         ret = memcmp(abuf, bbuf, alen);
 589
 590     OPENSSL_free(abuf);
 591     OPENSSL_free(bbuf);
 592
 593     return ret;
 594 }
 595
 596 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 597 {
 598     return xname_cmp(*a, *b);
 599 }
 600
 601 static unsigned long xname_hash(const X509_NAME *a)
 602 {
 603     return X509_NAME_hash((X509_NAME *)a);
 604 }
 605
 606 /**
 607  * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 608  * it doesn't really have anything to do with clients (except that a common use
 609  * for a stack of CAs is to send it to the client). Actually, it doesn't have
 610  * much to do with CAs, either, since it will load any old cert.
 611  * \param file the file containing one or more certs.
 612  * \return a ::STACK containing the certs.
 613  */
 614 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 615 {
 616     BIO *in = BIO_new(BIO_s_file());
 617     X509 *x = NULL;
 618     X509_NAME *xn = NULL;
 619     STACK_OF(X509_NAME) *ret = NULL;
 620     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 621
 622     if ((name_hash == NULL) || (in == NULL)) {
 623         SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 624         goto err;
 625     }
 626
 627     if (!BIO_read_filename(in, file))
 628         goto err;
 629
 630     for (;;) {
 631         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 632             break;
 633         if (ret == NULL) {
 634             ret = sk_X509_NAME_new_null();
 635             if (ret == NULL) {
 636                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 637                 goto err;
 638             }
 639         }
 640         if ((xn = X509_get_subject_name(x)) == NULL)
 641             goto err;
 642         /* check for duplicates */
 643         xn = X509_NAME_dup(xn);
 644         if (xn == NULL)
 645             goto err;
 646         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 647             /* Duplicate. */
 648             X509_NAME_free(xn);
 649             xn = NULL;
 650         } else {
 651             lh_X509_NAME_insert(name_hash, xn);
 652             if (!sk_X509_NAME_push(ret, xn))
 653                 goto err;
 654         }
 655     }
 656     goto done;
 657
 658  err:
 659     X509_NAME_free(xn);
 660     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 661     ret = NULL;
 662  done:
 663     BIO_free(in);
 664     X509_free(x);
 665     lh_X509_NAME_free(name_hash);
 666     if (ret != NULL)
 667         ERR_clear_error();
 668     return ret;
 669 }
 670
 671 /**
 672  * Add a file of certs to a stack.
 673  * \param stack the stack to add to.
 674  * \param file the file to add from. All certs in this file that are not
 675  * already in the stack will be added.
 676  * \return 1 for success, 0 for failure. Note that in the case of failure some
 677  * certs may have been added to \c stack.
 678  */
 679
 680 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 681                                         const char *file)
 682 {
 683     BIO *in;
 684     X509 *x = NULL;
 685     X509_NAME *xn = NULL;
 686     int ret = 1;
 687     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 688
 689     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 690
 691     in = BIO_new(BIO_s_file());
 692
 693     if (in == NULL) {
 694         SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
 695         goto err;
 696     }
 697
 698     if (!BIO_read_filename(in, file))
 699         goto err;
 700
 701     for (;;) {
 702         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 703             break;
 704         if ((xn = X509_get_subject_name(x)) == NULL)
 705             goto err;
 706         xn = X509_NAME_dup(xn);
 707         if (xn == NULL)
 708             goto err;
 709         if (sk_X509_NAME_find(stack, xn) >= 0) {
 710             /* Duplicate. */
 711             X509_NAME_free(xn);
 712         } else if (!sk_X509_NAME_push(stack, xn)) {
 713             X509_NAME_free(xn);
 714             goto err;
 715         }
 716     }
 717
 718     ERR_clear_error();
 719     goto done;
 720
 721  err:
 722     ret = 0;
 723  done:
 724     BIO_free(in);
 725     X509_free(x);
 726     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 727     return ret;
 728 }
 729
 730 /**
 731  * Add a directory of certs to a stack.
 732  * \param stack the stack to append to.
 733  * \param dir the directory to append from. All files in this directory will be
 734  * examined as potential certs. Any that are acceptable to
 735  * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
 736  * included.
 737  * \return 1 for success, 0 for failure. Note that in the case of failure some
 738  * certs may have been added to \c stack.
 739  */
 740
 741 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 742                                        const char *dir)
 743 {
 744     OPENSSL_DIR_CTX *d = NULL;
 745     const char *filename;
 746     int ret = 0;
 747
 748     /* Note that a side effect is that the CAs will be sorted by name */
 749
 750     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 751         char buf[1024];
 752         int r;
 753
 754         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 755             SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
 756                    SSL_R_PATH_TOO_LONG);
 757             goto err;
 758         }
 759 #ifdef OPENSSL_SYS_VMS
 760         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 761 #else
 762         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 763 #endif
 764         if (r <= 0 || r >= (int)sizeof(buf))
 765             goto err;
 766         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 767             goto err;
 768     }
 769
 770     if (errno) {
 771         SYSerr(SYS_F_OPENDIR, get_last_sys_error());
 772         ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
 773         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
 774         goto err;
 775     }
 776
 777     ret = 1;
 778
 779  err:
 780     if (d)
 781         OPENSSL_DIR_end(&d);
 782
 783     return ret;
 784 }
 785
 786 /* Build a certificate chain for current certificate */
 787 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 788 {
 789     CERT *c = s ? s->cert : ctx->cert;
 790     CERT_PKEY *cpk = c->key;
 791     X509_STORE *chain_store = NULL;
 792     X509_STORE_CTX *xs_ctx = NULL;
 793     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 794     X509 *x;
 795     int i, rv = 0;
 796
 797     if (!cpk->x509) {
 798         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
 799         goto err;
 800     }
 801     /* Rearranging and check the chain: add everything to a store */
 802     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 803         chain_store = X509_STORE_new();
 804         if (chain_store == NULL)
 805             goto err;
 806         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 807             x = sk_X509_value(cpk->chain, i);
 808             if (!X509_STORE_add_cert(chain_store, x))
 809                 goto err;
 810         }
 811         /* Add EE cert too: it might be self signed */
 812         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 813             goto err;
 814     } else {
 815         if (c->chain_store)
 816             chain_store = c->chain_store;
 817         else if (s)
 818             chain_store = s->ctx->cert_store;
 819         else
 820             chain_store = ctx->cert_store;
 821
 822         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 823             untrusted = cpk->chain;
 824     }
 825
 826     xs_ctx = X509_STORE_CTX_new();
 827     if (xs_ctx == NULL) {
 828         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 829         goto err;
 830     }
 831     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 832         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
 833         goto err;
 834     }
 835     /* Set suite B flags if needed */
 836     X509_STORE_CTX_set_flags(xs_ctx,
 837                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 838
 839     i = X509_verify_cert(xs_ctx);
 840     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 841         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 842             ERR_clear_error();
 843         i = 1;
 844         rv = 2;
 845     }
 846     if (i > 0)
 847         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 848     if (i <= 0) {
 849         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
 850         i = X509_STORE_CTX_get_error(xs_ctx);
 851         ERR_add_error_data(2, "Verify error:",
 852                            X509_verify_cert_error_string(i));
 853
 854         goto err;
 855     }
 856     /* Remove EE certificate from chain */
 857     x = sk_X509_shift(chain);
 858     X509_free(x);
 859     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 860         if (sk_X509_num(chain) > 0) {
 861             /* See if last cert is self signed */
 862             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 863             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 864                 x = sk_X509_pop(chain);
 865                 X509_free(x);
 866             }
 867         }
 868     }
 869     /*
 870      * Check security level of all CA certificates: EE will have been checked
 871      * already.
 872      */
 873     for (i = 0; i < sk_X509_num(chain); i++) {
 874         x = sk_X509_value(chain, i);
 875         rv = ssl_security_cert(s, ctx, x, 0, 0);
 876         if (rv != 1) {
 877             SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
 878             sk_X509_pop_free(chain, X509_free);
 879             rv = 0;
 880             goto err;
 881         }
 882     }
 883     sk_X509_pop_free(cpk->chain, X509_free);
 884     cpk->chain = chain;
 885     if (rv == 0)
 886         rv = 1;
 887  err:
 888     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 889         X509_STORE_free(chain_store);
 890     X509_STORE_CTX_free(xs_ctx);
 891
 892     return rv;
 893 }
 894
 895 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 896 {
 897     X509_STORE **pstore;
 898     if (chain)
 899         pstore = &c->chain_store;
 900     else
 901         pstore = &c->verify_store;
 902     X509_STORE_free(*pstore);
 903     *pstore = store;
 904     if (ref && store)
 905         X509_STORE_up_ref(store);
 906     return 1;
 907 }
 908
 909 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 910                                          int op, int bits, int nid, void *other,
 911                                          void *ex)
 912 {
 913     int level, minbits;
 914     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 915     if (ctx)
 916         level = SSL_CTX_get_security_level(ctx);
 917     else
 918         level = SSL_get_security_level(s);
 919
 920     if (level <= 0) {
 921         /*
 922          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 923          * anything goes.
 924          */
 925         if (op == SSL_SECOP_TMP_DH && bits < 80)
 926             return 0;
 927         return 1;
 928     }
 929     if (level > 5)
 930         level = 5;
 931     minbits = minbits_table[level - 1];
 932     switch (op) {
 933     case SSL_SECOP_CIPHER_SUPPORTED:
 934     case SSL_SECOP_CIPHER_SHARED:
 935     case SSL_SECOP_CIPHER_CHECK:
 936         {
 937             const SSL_CIPHER *c = other;
 938             /* No ciphers below security level */
 939             if (bits < minbits)
 940                 return 0;
 941             /* No unauthenticated ciphersuites */
 942             if (c->algorithm_auth & SSL_aNULL)
 943                 return 0;
 944             /* No MD5 mac ciphersuites */
 945             if (c->algorithm_mac & SSL_MD5)
 946                 return 0;
 947             /* SHA1 HMAC is 160 bits of security */
 948             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
 949                 return 0;
 950             /* Level 2: no RC4 */
 951             if (level >= 2 && c->algorithm_enc == SSL_RC4)
 952                 return 0;
 953             /* Level 3: forward secure ciphersuites only */
 954             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
 955                                !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
 956                 return 0;
 957             break;
 958         }
 959     case SSL_SECOP_VERSION:
 960         if (!SSL_IS_DTLS(s)) {
 961             /* SSLv3 not allowed at level 2 */
 962             if (nid <= SSL3_VERSION && level >= 2)
 963                 return 0;
 964             /* TLS v1.1 and above only for level 3 */
 965             if (nid <= TLS1_VERSION && level >= 3)
 966                 return 0;
 967             /* TLS v1.2 only for level 4 and above */
 968             if (nid <= TLS1_1_VERSION && level >= 4)
 969                 return 0;
 970         } else {
 971             /* DTLS v1.2 only for level 4 and above */
 972             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
 973                 return 0;
 974         }
 975         break;
 976
 977     case SSL_SECOP_COMPRESSION:
 978         if (level >= 2)
 979             return 0;
 980         break;
 981     case SSL_SECOP_TICKET:
 982         if (level >= 3)
 983             return 0;
 984         break;
 985     default:
 986         if (bits < minbits)
 987             return 0;
 988     }
 989     return 1;
 990 }
 991
 992 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
 993 {
 994     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
 995 }
 996
 997 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
 998 {
 999     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1000                              ctx->cert->sec_ex);
1001 }
1002
1003 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1004 {
1005     size_t i;
1006
1007     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1008         if (ssl_cert_info[i].nid == nid) {
1009             *pidx = i;
1010             return 1;
1011         }
1012     }
1013
1014     return 0;
1015 }
1016
1017 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1018 {
1019     int nid = EVP_PKEY_id(pk);
1020     size_t tmpidx;
1021
1022     if (nid == NID_undef)
1023         return NULL;
1024
1025     if (!ssl_cert_lookup_by_nid(nid, &tmpidx))
1026         return NULL;
1027
1028     if (pidx != NULL)
1029         *pidx = tmpidx;
1030
1031     return &ssl_cert_info[tmpidx];
1032 }
1033
1034 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1035 {
1036     if (idx >= OSSL_NELEM(ssl_cert_info))
1037         return NULL;
1038     return &ssl_cert_info[idx];
1039 }