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/store.h>
  19 #include <openssl/x509v3.h>
  20 #include <openssl/dh.h>
  21 #include <openssl/bn.h>
  22 #include <openssl/crypto.h>
  23 #include "internal/refcount.h"
  24 #include "ssl_local.h"
  25 #include "ssl_cert_table.h"
  26 #include "internal/thread_once.h"
  27
  28 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
  29                                          int op, int bits, int nid, void *other,
  30                                          void *ex);
  31
  32 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
  33 static volatile int ssl_x509_store_ctx_idx = -1;
  34
  35 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
  36 {
  37     ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
  38                                                              "SSL for verify callback",
  39                                                              NULL, NULL, NULL);
  40     return ssl_x509_store_ctx_idx >= 0;
  41 }
  42
  43 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
  44 {
  45
  46     if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
  47         return -1;
  48     return ssl_x509_store_ctx_idx;
  49 }
  50
  51 CERT *ssl_cert_new(void)
  52 {
  53     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  54
  55     if (ret == NULL) {
  56         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  57         return NULL;
  58     }
  59
  60     ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
  61     ret->references = 1;
  62     ret->sec_cb = ssl_security_default_callback;
  63     ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
  64     ret->sec_ex = NULL;
  65     ret->lock = CRYPTO_THREAD_lock_new();
  66     if (ret->lock == NULL) {
  67         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  68         OPENSSL_free(ret);
  69         return NULL;
  70     }
  71
  72     return ret;
  73 }
  74
  75 CERT *ssl_cert_dup(CERT *cert)
  76 {
  77     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  78     int i;
  79
  80     if (ret == NULL) {
  81         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  82         return NULL;
  83     }
  84
  85     ret->references = 1;
  86     ret->key = &ret->pkeys[cert->key - cert->pkeys];
  87     ret->lock = CRYPTO_THREAD_lock_new();
  88     if (ret->lock == NULL) {
  89         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  90         OPENSSL_free(ret);
  91         return NULL;
  92     }
  93 #ifndef OPENSSL_NO_DH
  94     if (cert->dh_tmp != NULL) {
  95         ret->dh_tmp = cert->dh_tmp;
  96         EVP_PKEY_up_ref(ret->dh_tmp);
  97     }
  98     ret->dh_tmp_cb = cert->dh_tmp_cb;
  99     ret->dh_tmp_auto = cert->dh_tmp_auto;
 100 #endif
 101
 102     for (i = 0; i < SSL_PKEY_NUM; i++) {
 103         CERT_PKEY *cpk = cert->pkeys + i;
 104         CERT_PKEY *rpk = ret->pkeys + i;
 105         if (cpk->x509 != NULL) {
 106             rpk->x509 = cpk->x509;
 107             X509_up_ref(rpk->x509);
 108         }
 109
 110         if (cpk->privatekey != NULL) {
 111             rpk->privatekey = cpk->privatekey;
 112             EVP_PKEY_up_ref(cpk->privatekey);
 113         }
 114
 115         if (cpk->chain) {
 116             rpk->chain = X509_chain_up_ref(cpk->chain);
 117             if (!rpk->chain) {
 118                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 119                 goto err;
 120             }
 121         }
 122         if (cert->pkeys[i].serverinfo != NULL) {
 123             /* Just copy everything. */
 124             ret->pkeys[i].serverinfo =
 125                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
 126             if (ret->pkeys[i].serverinfo == NULL) {
 127                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 128                 goto err;
 129             }
 130             ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
 131             memcpy(ret->pkeys[i].serverinfo,
 132                    cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
 133         }
 134     }
 135
 136     /* Configured sigalgs copied across */
 137     if (cert->conf_sigalgs) {
 138         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
 139                                            * sizeof(*cert->conf_sigalgs));
 140         if (ret->conf_sigalgs == NULL)
 141             goto err;
 142         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
 143                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
 144         ret->conf_sigalgslen = cert->conf_sigalgslen;
 145     } else
 146         ret->conf_sigalgs = NULL;
 147
 148     if (cert->client_sigalgs) {
 149         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
 150                                              * sizeof(*cert->client_sigalgs));
 151         if (ret->client_sigalgs == NULL)
 152             goto err;
 153         memcpy(ret->client_sigalgs, cert->client_sigalgs,
 154                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
 155         ret->client_sigalgslen = cert->client_sigalgslen;
 156     } else
 157         ret->client_sigalgs = NULL;
 158     /* Copy any custom client certificate types */
 159     if (cert->ctype) {
 160         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
 161         if (ret->ctype == NULL)
 162             goto err;
 163         ret->ctype_len = cert->ctype_len;
 164     }
 165
 166     ret->cert_flags = cert->cert_flags;
 167
 168     ret->cert_cb = cert->cert_cb;
 169     ret->cert_cb_arg = cert->cert_cb_arg;
 170
 171     if (cert->verify_store) {
 172         X509_STORE_up_ref(cert->verify_store);
 173         ret->verify_store = cert->verify_store;
 174     }
 175
 176     if (cert->chain_store) {
 177         X509_STORE_up_ref(cert->chain_store);
 178         ret->chain_store = cert->chain_store;
 179     }
 180
 181     ret->sec_cb = cert->sec_cb;
 182     ret->sec_level = cert->sec_level;
 183     ret->sec_ex = cert->sec_ex;
 184
 185     if (!custom_exts_copy(&ret->custext, &cert->custext))
 186         goto err;
 187 #ifndef OPENSSL_NO_PSK
 188     if (cert->psk_identity_hint) {
 189         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
 190         if (ret->psk_identity_hint == NULL)
 191             goto err;
 192     }
 193 #endif
 194     return ret;
 195
 196  err:
 197     ssl_cert_free(ret);
 198
 199     return NULL;
 200 }
 201
 202 /* Free up and clear all certificates and chains */
 203
 204 void ssl_cert_clear_certs(CERT *c)
 205 {
 206     int i;
 207     if (c == NULL)
 208         return;
 209     for (i = 0; i < SSL_PKEY_NUM; i++) {
 210         CERT_PKEY *cpk = c->pkeys + i;
 211         X509_free(cpk->x509);
 212         cpk->x509 = NULL;
 213         EVP_PKEY_free(cpk->privatekey);
 214         cpk->privatekey = NULL;
 215         sk_X509_pop_free(cpk->chain, X509_free);
 216         cpk->chain = NULL;
 217         OPENSSL_free(cpk->serverinfo);
 218         cpk->serverinfo = NULL;
 219         cpk->serverinfo_length = 0;
 220     }
 221 }
 222
 223 void ssl_cert_free(CERT *c)
 224 {
 225     int i;
 226
 227     if (c == NULL)
 228         return;
 229     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
 230     REF_PRINT_COUNT("CERT", c);
 231     if (i > 0)
 232         return;
 233     REF_ASSERT_ISNT(i < 0);
 234
 235 #ifndef OPENSSL_NO_DH
 236     EVP_PKEY_free(c->dh_tmp);
 237 #endif
 238
 239     ssl_cert_clear_certs(c);
 240     OPENSSL_free(c->conf_sigalgs);
 241     OPENSSL_free(c->client_sigalgs);
 242     OPENSSL_free(c->ctype);
 243     X509_STORE_free(c->verify_store);
 244     X509_STORE_free(c->chain_store);
 245     custom_exts_free(&c->custext);
 246 #ifndef OPENSSL_NO_PSK
 247     OPENSSL_free(c->psk_identity_hint);
 248 #endif
 249     CRYPTO_THREAD_lock_free(c->lock);
 250     OPENSSL_free(c);
 251 }
 252
 253 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 254 {
 255     int i, r;
 256     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 257     if (!cpk)
 258         return 0;
 259     for (i = 0; i < sk_X509_num(chain); i++) {
 260         r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
 261         if (r != 1) {
 262             SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
 263             return 0;
 264         }
 265     }
 266     sk_X509_pop_free(cpk->chain, X509_free);
 267     cpk->chain = chain;
 268     return 1;
 269 }
 270
 271 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 272 {
 273     STACK_OF(X509) *dchain;
 274     if (!chain)
 275         return ssl_cert_set0_chain(s, ctx, NULL);
 276     dchain = X509_chain_up_ref(chain);
 277     if (!dchain)
 278         return 0;
 279     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 280         sk_X509_pop_free(dchain, X509_free);
 281         return 0;
 282     }
 283     return 1;
 284 }
 285
 286 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 287 {
 288     int r;
 289     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 290     if (!cpk)
 291         return 0;
 292     r = ssl_security_cert(s, ctx, x, 0, 0);
 293     if (r != 1) {
 294         SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
 295         return 0;
 296     }
 297     if (!cpk->chain)
 298         cpk->chain = sk_X509_new_null();
 299     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 300         return 0;
 301     return 1;
 302 }
 303
 304 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 305 {
 306     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 307         return 0;
 308     X509_up_ref(x);
 309     return 1;
 310 }
 311
 312 int ssl_cert_select_current(CERT *c, X509 *x)
 313 {
 314     int i;
 315     if (x == NULL)
 316         return 0;
 317     for (i = 0; i < SSL_PKEY_NUM; i++) {
 318         CERT_PKEY *cpk = c->pkeys + i;
 319         if (cpk->x509 == x && cpk->privatekey) {
 320             c->key = cpk;
 321             return 1;
 322         }
 323     }
 324
 325     for (i = 0; i < SSL_PKEY_NUM; i++) {
 326         CERT_PKEY *cpk = c->pkeys + i;
 327         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 328             c->key = cpk;
 329             return 1;
 330         }
 331     }
 332     return 0;
 333 }
 334
 335 int ssl_cert_set_current(CERT *c, long op)
 336 {
 337     int i, idx;
 338     if (!c)
 339         return 0;
 340     if (op == SSL_CERT_SET_FIRST)
 341         idx = 0;
 342     else if (op == SSL_CERT_SET_NEXT) {
 343         idx = (int)(c->key - c->pkeys + 1);
 344         if (idx >= SSL_PKEY_NUM)
 345             return 0;
 346     } else
 347         return 0;
 348     for (i = idx; i < SSL_PKEY_NUM; i++) {
 349         CERT_PKEY *cpk = c->pkeys + i;
 350         if (cpk->x509 && cpk->privatekey) {
 351             c->key = cpk;
 352             return 1;
 353         }
 354     }
 355     return 0;
 356 }
 357
 358 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 359 {
 360     c->cert_cb = cb;
 361     c->cert_cb_arg = arg;
 362 }
 363
 364 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
 365 {
 366     X509 *x;
 367     int i = 0;
 368     X509_STORE *verify_store;
 369     X509_STORE_CTX *ctx = NULL;
 370     X509_VERIFY_PARAM *param;
 371
 372     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 373         return 0;
 374
 375     if (s->cert->verify_store)
 376         verify_store = s->cert->verify_store;
 377     else
 378         verify_store = s->ctx->cert_store;
 379
 380     ctx = X509_STORE_CTX_new();
 381     if (ctx == NULL) {
 382         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 383         return 0;
 384     }
 385
 386     x = sk_X509_value(sk, 0);
 387     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 388         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
 389         goto end;
 390     }
 391     param = X509_STORE_CTX_get0_param(ctx);
 392     /*
 393      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 394      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 395      * and PKI authentication.
 396      */
 397     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
 398
 399     /* Set suite B flags if needed */
 400     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 401     if (!X509_STORE_CTX_set_ex_data
 402         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 403         goto end;
 404     }
 405
 406     /* Verify via DANE if enabled */
 407     if (DANETLS_ENABLED(&s->dane))
 408         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 409
 410     /*
 411      * We need to inherit the verify parameters. These can be determined by
 412      * the context: if its a server it will verify SSL client certificates or
 413      * vice versa.
 414      */
 415
 416     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 417     /*
 418      * Anything non-default in "s->param" should overwrite anything in the ctx.
 419      */
 420     X509_VERIFY_PARAM_set1(param, s->param);
 421
 422     if (s->verify_callback)
 423         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 424
 425     if (s->ctx->app_verify_callback != NULL)
 426         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
 427     else
 428         i = X509_verify_cert(ctx);
 429
 430     s->verify_result = X509_STORE_CTX_get_error(ctx);
 431     sk_X509_pop_free(s->verified_chain, X509_free);
 432     s->verified_chain = NULL;
 433     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 434         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 435         if (s->verified_chain == NULL) {
 436             SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 437             i = 0;
 438         }
 439     }
 440
 441     /* Move peername from the store context params to the SSL handle's */
 442     X509_VERIFY_PARAM_move_peername(s->param, param);
 443
 444  end:
 445     X509_STORE_CTX_free(ctx);
 446     return i;
 447 }
 448
 449 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 450                         STACK_OF(X509_NAME) *name_list)
 451 {
 452     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 453     *ca_list = name_list;
 454 }
 455
 456 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 457 {
 458     int i;
 459     const int num = sk_X509_NAME_num(sk);
 460     STACK_OF(X509_NAME) *ret;
 461     X509_NAME *name;
 462
 463     ret = sk_X509_NAME_new_reserve(NULL, num);
 464     if (ret == NULL) {
 465         SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 466         return NULL;
 467     }
 468     for (i = 0; i < num; i++) {
 469         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 470         if (name == NULL) {
 471             SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 472             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 473             return NULL;
 474         }
 475         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 476     }
 477     return ret;
 478 }
 479
 480 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 481 {
 482     set0_CA_list(&s->ca_names, name_list);
 483 }
 484
 485 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 486 {
 487     set0_CA_list(&ctx->ca_names, name_list);
 488 }
 489
 490 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 491 {
 492     return ctx->ca_names;
 493 }
 494
 495 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 496 {
 497     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 498 }
 499
 500 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 501 {
 502     set0_CA_list(&ctx->client_ca_names, name_list);
 503 }
 504
 505 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 506 {
 507     return ctx->client_ca_names;
 508 }
 509
 510 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 511 {
 512     set0_CA_list(&s->client_ca_names, name_list);
 513 }
 514
 515 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 516 {
 517     return s->s3.tmp.peer_ca_names;
 518 }
 519
 520 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 521 {
 522     if (!s->server)
 523         return s->s3.tmp.peer_ca_names;
 524     return s->client_ca_names != NULL ?  s->client_ca_names
 525                                       : s->ctx->client_ca_names;
 526 }
 527
 528 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 529 {
 530     X509_NAME *name;
 531
 532     if (x == NULL)
 533         return 0;
 534     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 535         return 0;
 536
 537     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 538         return 0;
 539
 540     if (!sk_X509_NAME_push(*sk, name)) {
 541         X509_NAME_free(name);
 542         return 0;
 543     }
 544     return 1;
 545 }
 546
 547 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 548 {
 549     return add_ca_name(&ssl->ca_names, x);
 550 }
 551
 552 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 553 {
 554     return add_ca_name(&ctx->ca_names, x);
 555 }
 556
 557 /*
 558  * The following two are older names are to be replaced with
 559  * SSL(_CTX)_add1_to_CA_list
 560  */
 561 int SSL_add_client_CA(SSL *ssl, X509 *x)
 562 {
 563     return add_ca_name(&ssl->client_ca_names, x);
 564 }
 565
 566 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 567 {
 568     return add_ca_name(&ctx->client_ca_names, x);
 569 }
 570
 571 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 572 {
 573     unsigned char *abuf = NULL, *bbuf = NULL;
 574     int alen, blen, ret;
 575
 576     /* X509_NAME_cmp() itself casts away constness in this way, so
 577      * assume it's safe:
 578      */
 579     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 580     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 581
 582     if (alen < 0 || blen < 0)
 583         ret = -2;
 584     else if (alen != blen)
 585         ret = alen - blen;
 586     else /* alen == blen */
 587         ret = memcmp(abuf, bbuf, alen);
 588
 589     OPENSSL_free(abuf);
 590     OPENSSL_free(bbuf);
 591
 592     return ret;
 593 }
 594
 595 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 596 {
 597     return xname_cmp(*a, *b);
 598 }
 599
 600 static unsigned long xname_hash(const X509_NAME *a)
 601 {
 602     return X509_NAME_hash((X509_NAME *)a);
 603 }
 604
 605 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 606 {
 607     BIO *in = BIO_new(BIO_s_file());
 608     X509 *x = NULL;
 609     X509_NAME *xn = NULL;
 610     STACK_OF(X509_NAME) *ret = NULL;
 611     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 612
 613     if ((name_hash == NULL) || (in == NULL)) {
 614         SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 615         goto err;
 616     }
 617
 618     if (!BIO_read_filename(in, file))
 619         goto err;
 620
 621     for (;;) {
 622         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 623             break;
 624         if (ret == NULL) {
 625             ret = sk_X509_NAME_new_null();
 626             if (ret == NULL) {
 627                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 628                 goto err;
 629             }
 630         }
 631         if ((xn = X509_get_subject_name(x)) == NULL)
 632             goto err;
 633         /* check for duplicates */
 634         xn = X509_NAME_dup(xn);
 635         if (xn == NULL)
 636             goto err;
 637         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 638             /* Duplicate. */
 639             X509_NAME_free(xn);
 640             xn = NULL;
 641         } else {
 642             lh_X509_NAME_insert(name_hash, xn);
 643             if (!sk_X509_NAME_push(ret, xn))
 644                 goto err;
 645         }
 646     }
 647     goto done;
 648
 649  err:
 650     X509_NAME_free(xn);
 651     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 652     ret = NULL;
 653  done:
 654     BIO_free(in);
 655     X509_free(x);
 656     lh_X509_NAME_free(name_hash);
 657     if (ret != NULL)
 658         ERR_clear_error();
 659     return ret;
 660 }
 661
 662 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 663                                         const char *file)
 664 {
 665     BIO *in;
 666     X509 *x = NULL;
 667     X509_NAME *xn = NULL;
 668     int ret = 1;
 669     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 670
 671     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 672
 673     in = BIO_new(BIO_s_file());
 674
 675     if (in == NULL) {
 676         SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
 677         goto err;
 678     }
 679
 680     if (!BIO_read_filename(in, file))
 681         goto err;
 682
 683     for (;;) {
 684         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 685             break;
 686         if ((xn = X509_get_subject_name(x)) == NULL)
 687             goto err;
 688         xn = X509_NAME_dup(xn);
 689         if (xn == NULL)
 690             goto err;
 691         if (sk_X509_NAME_find(stack, xn) >= 0) {
 692             /* Duplicate. */
 693             X509_NAME_free(xn);
 694         } else if (!sk_X509_NAME_push(stack, xn)) {
 695             X509_NAME_free(xn);
 696             goto err;
 697         }
 698     }
 699
 700     ERR_clear_error();
 701     goto done;
 702
 703  err:
 704     ret = 0;
 705  done:
 706     BIO_free(in);
 707     X509_free(x);
 708     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 709     return ret;
 710 }
 711
 712 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 713                                        const char *dir)
 714 {
 715     OPENSSL_DIR_CTX *d = NULL;
 716     const char *filename;
 717     int ret = 0;
 718
 719     /* Note that a side effect is that the CAs will be sorted by name */
 720
 721     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 722         char buf[1024];
 723         int r;
 724
 725         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 726             SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
 727                    SSL_R_PATH_TOO_LONG);
 728             goto err;
 729         }
 730 #ifdef OPENSSL_SYS_VMS
 731         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 732 #else
 733         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 734 #endif
 735         if (r <= 0 || r >= (int)sizeof(buf))
 736             goto err;
 737         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 738             goto err;
 739     }
 740
 741     if (errno) {
 742         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 743                        "calling OPENSSL_dir_read(%s)",
 744                        dir);
 745         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
 746         goto err;
 747     }
 748
 749     ret = 1;
 750
 751  err:
 752     if (d)
 753         OPENSSL_DIR_end(&d);
 754
 755     return ret;
 756 }
 757
 758 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
 759                               const char *uri, int depth)
 760 {
 761     int ok = 1;
 762     OSSL_STORE_CTX *ctx = NULL;
 763     X509 *x = NULL;
 764     X509_NAME *xn = NULL;
 765
 766     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
 767         goto err;
 768
 769     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
 770         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
 771         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
 772
 773         if (info == NULL)
 774             continue;
 775
 776         if (infotype == OSSL_STORE_INFO_NAME) {
 777             /*
 778              * This is an entry in the "directory" represented by the current
 779              * uri.  if |depth| allows, dive into it.
 780              */
 781             if (depth > 0)
 782                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
 783                                         depth - 1);
 784         } else if (infotype == OSSL_STORE_INFO_CERT) {
 785             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
 786                 || (xn = X509_get_subject_name(x)) == NULL
 787                 || (xn = X509_NAME_dup(xn)) == NULL)
 788                 goto err;
 789             if (sk_X509_NAME_find(stack, xn) >= 0) {
 790                 /* Duplicate. */
 791                 X509_NAME_free(xn);
 792             } else if (!sk_X509_NAME_push(stack, xn)) {
 793                 X509_NAME_free(xn);
 794                 goto err;
 795             }
 796         }
 797
 798         OSSL_STORE_INFO_free(info);
 799     }
 800
 801     ERR_clear_error();
 802     goto done;
 803
 804  err:
 805     ok = 0;
 806  done:
 807     OSSL_STORE_close(ctx);
 808
 809     return ok;
 810 }
 811
 812 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 813                                          const char *store)
 814 {
 815     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
 816         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 817     int ret = add_uris_recursive(stack, store, 1);
 818
 819     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 820     return ret;
 821 }
 822
 823 /* Build a certificate chain for current certificate */
 824 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 825 {
 826     CERT *c = s ? s->cert : ctx->cert;
 827     CERT_PKEY *cpk = c->key;
 828     X509_STORE *chain_store = NULL;
 829     X509_STORE_CTX *xs_ctx = NULL;
 830     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 831     X509 *x;
 832     int i, rv = 0;
 833
 834     if (!cpk->x509) {
 835         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
 836         goto err;
 837     }
 838     /* Rearranging and check the chain: add everything to a store */
 839     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 840         chain_store = X509_STORE_new();
 841         if (chain_store == NULL)
 842             goto err;
 843         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 844             x = sk_X509_value(cpk->chain, i);
 845             if (!X509_STORE_add_cert(chain_store, x))
 846                 goto err;
 847         }
 848         /* Add EE cert too: it might be self signed */
 849         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 850             goto err;
 851     } else {
 852         if (c->chain_store)
 853             chain_store = c->chain_store;
 854         else if (s)
 855             chain_store = s->ctx->cert_store;
 856         else
 857             chain_store = ctx->cert_store;
 858
 859         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 860             untrusted = cpk->chain;
 861     }
 862
 863     xs_ctx = X509_STORE_CTX_new();
 864     if (xs_ctx == NULL) {
 865         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 866         goto err;
 867     }
 868     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 869         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
 870         goto err;
 871     }
 872     /* Set suite B flags if needed */
 873     X509_STORE_CTX_set_flags(xs_ctx,
 874                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 875
 876     i = X509_verify_cert(xs_ctx);
 877     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 878         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 879             ERR_clear_error();
 880         i = 1;
 881         rv = 2;
 882     }
 883     if (i > 0)
 884         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 885     if (i <= 0) {
 886         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
 887         i = X509_STORE_CTX_get_error(xs_ctx);
 888         ERR_add_error_data(2, "Verify error:",
 889                            X509_verify_cert_error_string(i));
 890
 891         goto err;
 892     }
 893     /* Remove EE certificate from chain */
 894     x = sk_X509_shift(chain);
 895     X509_free(x);
 896     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 897         if (sk_X509_num(chain) > 0) {
 898             /* See if last cert is self signed */
 899             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 900             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 901                 x = sk_X509_pop(chain);
 902                 X509_free(x);
 903             }
 904         }
 905     }
 906     /*
 907      * Check security level of all CA certificates: EE will have been checked
 908      * already.
 909      */
 910     for (i = 0; i < sk_X509_num(chain); i++) {
 911         x = sk_X509_value(chain, i);
 912         rv = ssl_security_cert(s, ctx, x, 0, 0);
 913         if (rv != 1) {
 914             SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
 915             sk_X509_pop_free(chain, X509_free);
 916             rv = 0;
 917             goto err;
 918         }
 919     }
 920     sk_X509_pop_free(cpk->chain, X509_free);
 921     cpk->chain = chain;
 922     if (rv == 0)
 923         rv = 1;
 924  err:
 925     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 926         X509_STORE_free(chain_store);
 927     X509_STORE_CTX_free(xs_ctx);
 928
 929     return rv;
 930 }
 931
 932 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 933 {
 934     X509_STORE **pstore;
 935     if (chain)
 936         pstore = &c->chain_store;
 937     else
 938         pstore = &c->verify_store;
 939     X509_STORE_free(*pstore);
 940     *pstore = store;
 941     if (ref && store)
 942         X509_STORE_up_ref(store);
 943     return 1;
 944 }
 945
 946 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 947                                          int op, int bits, int nid, void *other,
 948                                          void *ex)
 949 {
 950     int level, minbits;
 951     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 952     if (ctx)
 953         level = SSL_CTX_get_security_level(ctx);
 954     else
 955         level = SSL_get_security_level(s);
 956
 957     if (level <= 0) {
 958         /*
 959          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 960          * anything goes.
 961          */
 962         if (op == SSL_SECOP_TMP_DH && bits < 80)
 963             return 0;
 964         return 1;
 965     }
 966     if (level > 5)
 967         level = 5;
 968     minbits = minbits_table[level - 1];
 969     switch (op) {
 970     case SSL_SECOP_CIPHER_SUPPORTED:
 971     case SSL_SECOP_CIPHER_SHARED:
 972     case SSL_SECOP_CIPHER_CHECK:
 973         {
 974             const SSL_CIPHER *c = other;
 975             /* No ciphers below security level */
 976             if (bits < minbits)
 977                 return 0;
 978             /* No unauthenticated ciphersuites */
 979             if (c->algorithm_auth & SSL_aNULL)
 980                 return 0;
 981             /* No MD5 mac ciphersuites */
 982             if (c->algorithm_mac & SSL_MD5)
 983                 return 0;
 984             /* SHA1 HMAC is 160 bits of security */
 985             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
 986                 return 0;
 987             /* Level 2: no RC4 */
 988             if (level >= 2 && c->algorithm_enc == SSL_RC4)
 989                 return 0;
 990             /* Level 3: forward secure ciphersuites only */
 991             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
 992                                !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
 993                 return 0;
 994             break;
 995         }
 996     case SSL_SECOP_VERSION:
 997         if (!SSL_IS_DTLS(s)) {
 998             /* SSLv3 not allowed at level 2 */
 999             if (nid <= SSL3_VERSION && level >= 2)
1000                 return 0;
1001             /* TLS v1.1 and above only for level 3 */
1002             if (nid <= TLS1_VERSION && level >= 3)
1003                 return 0;
1004             /* TLS v1.2 only for level 4 and above */
1005             if (nid <= TLS1_1_VERSION && level >= 4)
1006                 return 0;
1007         } else {
1008             /* DTLS v1.2 only for level 4 and above */
1009             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
1010                 return 0;
1011         }
1012         break;
1013
1014     case SSL_SECOP_COMPRESSION:
1015         if (level >= 2)
1016             return 0;
1017         break;
1018     case SSL_SECOP_TICKET:
1019         if (level >= 3)
1020             return 0;
1021         break;
1022     default:
1023         if (bits < minbits)
1024             return 0;
1025     }
1026     return 1;
1027 }
1028
1029 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
1030 {
1031     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1032 }
1033
1034 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1035 {
1036     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1037                              ctx->cert->sec_ex);
1038 }
1039
1040 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1041 {
1042     size_t i;
1043
1044     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1045         if (ssl_cert_info[i].nid == nid) {
1046             *pidx = i;
1047             return 1;
1048         }
1049     }
1050
1051     return 0;
1052 }
1053
1054 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1055 {
1056     int nid = EVP_PKEY_id(pk);
1057     size_t tmpidx;
1058
1059     if (nid == NID_undef)
1060         return NULL;
1061
1062     if (!ssl_cert_lookup_by_nid(nid, &tmpidx))
1063         return NULL;
1064
1065     if (pidx != NULL)
1066         *pidx = tmpidx;
1067
1068     return &ssl_cert_info[tmpidx];
1069 }
1070
1071 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1072 {
1073     if (idx >= OSSL_NELEM(ssl_cert_info))
1074         return NULL;
1075     return &ssl_cert_info[idx];
1076 }