ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2022 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         ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
  90         OPENSSL_free(ret);
  91         return NULL;
  92     }
  93
  94     if (cert->dh_tmp != NULL) {
  95         ret->dh_tmp = cert->dh_tmp;
  96         EVP_PKEY_up_ref(ret->dh_tmp);
  97     }
  98
  99     ret->dh_tmp_cb = cert->dh_tmp_cb;
 100     ret->dh_tmp_auto = cert->dh_tmp_auto;
 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                 ERR_raise(ERR_LIB_SSL, 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                 ERR_raise(ERR_LIB_SSL, 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         OSSL_STACK_OF_X509_free(cpk->chain);
 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     EVP_PKEY_free(c->dh_tmp);
 236
 237     ssl_cert_clear_certs(c);
 238     OPENSSL_free(c->conf_sigalgs);
 239     OPENSSL_free(c->client_sigalgs);
 240     OPENSSL_free(c->ctype);
 241     X509_STORE_free(c->verify_store);
 242     X509_STORE_free(c->chain_store);
 243     custom_exts_free(&c->custext);
 244 #ifndef OPENSSL_NO_PSK
 245     OPENSSL_free(c->psk_identity_hint);
 246 #endif
 247     CRYPTO_THREAD_lock_free(c->lock);
 248     OPENSSL_free(c);
 249 }
 250
 251 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 252 {
 253     int i, r;
 254     CERT_PKEY *cpk = s != NULL ? s->cert->key : ctx->cert->key;
 255
 256     if (!cpk)
 257         return 0;
 258     for (i = 0; i < sk_X509_num(chain); i++) {
 259         X509 *x = sk_X509_value(chain, i);
 260
 261         r = ssl_security_cert(s, ctx, x, 0, 0);
 262         if (r != 1) {
 263             ERR_raise(ERR_LIB_SSL, r);
 264             return 0;
 265         }
 266     }
 267     OSSL_STACK_OF_X509_free(cpk->chain);
 268     cpk->chain = chain;
 269     return 1;
 270 }
 271
 272 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 273 {
 274     STACK_OF(X509) *dchain;
 275     if (!chain)
 276         return ssl_cert_set0_chain(s, ctx, NULL);
 277     dchain = X509_chain_up_ref(chain);
 278     if (!dchain)
 279         return 0;
 280     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 281         OSSL_STACK_OF_X509_free(dchain);
 282         return 0;
 283     }
 284     return 1;
 285 }
 286
 287 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 288 {
 289     int r;
 290     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 291     if (!cpk)
 292         return 0;
 293     r = ssl_security_cert(s, ctx, x, 0, 0);
 294     if (r != 1) {
 295         ERR_raise(ERR_LIB_SSL, r);
 296         return 0;
 297     }
 298     if (!cpk->chain)
 299         cpk->chain = sk_X509_new_null();
 300     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 301         return 0;
 302     return 1;
 303 }
 304
 305 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 306 {
 307     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 308         return 0;
 309     X509_up_ref(x);
 310     return 1;
 311 }
 312
 313 int ssl_cert_select_current(CERT *c, X509 *x)
 314 {
 315     int i;
 316     if (x == NULL)
 317         return 0;
 318     for (i = 0; i < SSL_PKEY_NUM; i++) {
 319         CERT_PKEY *cpk = c->pkeys + i;
 320         if (cpk->x509 == x && cpk->privatekey) {
 321             c->key = cpk;
 322             return 1;
 323         }
 324     }
 325
 326     for (i = 0; i < SSL_PKEY_NUM; i++) {
 327         CERT_PKEY *cpk = c->pkeys + i;
 328         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 329             c->key = cpk;
 330             return 1;
 331         }
 332     }
 333     return 0;
 334 }
 335
 336 int ssl_cert_set_current(CERT *c, long op)
 337 {
 338     int i, idx;
 339     if (!c)
 340         return 0;
 341     if (op == SSL_CERT_SET_FIRST)
 342         idx = 0;
 343     else if (op == SSL_CERT_SET_NEXT) {
 344         idx = (int)(c->key - c->pkeys + 1);
 345         if (idx >= SSL_PKEY_NUM)
 346             return 0;
 347     } else
 348         return 0;
 349     for (i = idx; i < SSL_PKEY_NUM; i++) {
 350         CERT_PKEY *cpk = c->pkeys + i;
 351         if (cpk->x509 && cpk->privatekey) {
 352             c->key = cpk;
 353             return 1;
 354         }
 355     }
 356     return 0;
 357 }
 358
 359 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 360 {
 361     c->cert_cb = cb;
 362     c->cert_cb_arg = arg;
 363 }
 364
 365 /*
 366  * Verify a certificate chain
 367  * Return codes:
 368  *  1: Verify success
 369  *  0: Verify failure or error
 370  * -1: Retry required
 371  */
 372 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
 373 {
 374     X509 *x;
 375     int i = 0;
 376     X509_STORE *verify_store;
 377     X509_STORE_CTX *ctx = NULL;
 378     X509_VERIFY_PARAM *param;
 379
 380     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 381         return 0;
 382
 383     if (s->cert->verify_store)
 384         verify_store = s->cert->verify_store;
 385     else
 386         verify_store = s->ctx->cert_store;
 387
 388     ctx = X509_STORE_CTX_new_ex(s->ctx->libctx, s->ctx->propq);
 389     if (ctx == NULL) {
 390         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 391         return 0;
 392     }
 393
 394     x = sk_X509_value(sk, 0);
 395     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 396         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 397         goto end;
 398     }
 399     param = X509_STORE_CTX_get0_param(ctx);
 400     /*
 401      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 402      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 403      * and PKI authentication.
 404      */
 405     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
 406
 407     /* Set suite B flags if needed */
 408     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 409     if (!X509_STORE_CTX_set_ex_data
 410         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 411         goto end;
 412     }
 413
 414     /* Verify via DANE if enabled */
 415     if (DANETLS_ENABLED(&s->dane))
 416         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 417
 418     /*
 419      * We need to inherit the verify parameters. These can be determined by
 420      * the context: if its a server it will verify SSL client certificates or
 421      * vice versa.
 422      */
 423
 424     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 425     /*
 426      * Anything non-default in "s->param" should overwrite anything in the ctx.
 427      */
 428     X509_VERIFY_PARAM_set1(param, s->param);
 429
 430     if (s->verify_callback)
 431         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 432
 433     if (s->ctx->app_verify_callback != NULL) {
 434         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
 435     } else {
 436         i = X509_verify_cert(ctx);
 437         /* We treat an error in the same way as a failure to verify */
 438         if (i < 0)
 439             i = 0;
 440     }
 441
 442     s->verify_result = X509_STORE_CTX_get_error(ctx);
 443     OSSL_STACK_OF_X509_free(s->verified_chain);
 444     s->verified_chain = NULL;
 445     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 446         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 447         if (s->verified_chain == NULL) {
 448             ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 449             i = 0;
 450         }
 451     }
 452
 453     /* Move peername from the store context params to the SSL handle's */
 454     X509_VERIFY_PARAM_move_peername(s->param, param);
 455
 456  end:
 457     X509_STORE_CTX_free(ctx);
 458     return i;
 459 }
 460
 461 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 462                         STACK_OF(X509_NAME) *name_list)
 463 {
 464     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 465     *ca_list = name_list;
 466 }
 467
 468 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 469 {
 470     int i;
 471     const int num = sk_X509_NAME_num(sk);
 472     STACK_OF(X509_NAME) *ret;
 473     X509_NAME *name;
 474
 475     ret = sk_X509_NAME_new_reserve(NULL, num);
 476     if (ret == NULL) {
 477         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 478         return NULL;
 479     }
 480     for (i = 0; i < num; i++) {
 481         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 482         if (name == NULL) {
 483             ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 484             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 485             return NULL;
 486         }
 487         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 488     }
 489     return ret;
 490 }
 491
 492 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 493 {
 494     set0_CA_list(&s->ca_names, name_list);
 495 }
 496
 497 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 498 {
 499     set0_CA_list(&ctx->ca_names, name_list);
 500 }
 501
 502 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 503 {
 504     return ctx->ca_names;
 505 }
 506
 507 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 508 {
 509     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 510 }
 511
 512 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 513 {
 514     set0_CA_list(&ctx->client_ca_names, name_list);
 515 }
 516
 517 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 518 {
 519     return ctx->client_ca_names;
 520 }
 521
 522 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 523 {
 524     set0_CA_list(&s->client_ca_names, name_list);
 525 }
 526
 527 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 528 {
 529     return s->s3.tmp.peer_ca_names;
 530 }
 531
 532 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 533 {
 534     if (!s->server)
 535         return s->s3.tmp.peer_ca_names;
 536     return s->client_ca_names != NULL ?  s->client_ca_names
 537                                       : s->ctx->client_ca_names;
 538 }
 539
 540 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 541 {
 542     X509_NAME *name;
 543
 544     if (x == NULL)
 545         return 0;
 546     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 547         return 0;
 548
 549     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 550         return 0;
 551
 552     if (!sk_X509_NAME_push(*sk, name)) {
 553         X509_NAME_free(name);
 554         return 0;
 555     }
 556     return 1;
 557 }
 558
 559 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 560 {
 561     return add_ca_name(&ssl->ca_names, x);
 562 }
 563
 564 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 565 {
 566     return add_ca_name(&ctx->ca_names, x);
 567 }
 568
 569 /*
 570  * The following two are older names are to be replaced with
 571  * SSL(_CTX)_add1_to_CA_list
 572  */
 573 int SSL_add_client_CA(SSL *ssl, X509 *x)
 574 {
 575     return add_ca_name(&ssl->client_ca_names, x);
 576 }
 577
 578 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 579 {
 580     return add_ca_name(&ctx->client_ca_names, x);
 581 }
 582
 583 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 584 {
 585     unsigned char *abuf = NULL, *bbuf = NULL;
 586     int alen, blen, ret;
 587
 588     /* X509_NAME_cmp() itself casts away constness in this way, so
 589      * assume it's safe:
 590      */
 591     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 592     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 593
 594     if (alen < 0 || blen < 0)
 595         ret = -2;
 596     else if (alen != blen)
 597         ret = alen - blen;
 598     else /* alen == blen */
 599         ret = memcmp(abuf, bbuf, alen);
 600
 601     OPENSSL_free(abuf);
 602     OPENSSL_free(bbuf);
 603
 604     return ret;
 605 }
 606
 607 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 608 {
 609     return xname_cmp(*a, *b);
 610 }
 611
 612 static unsigned long xname_hash(const X509_NAME *a)
 613 {
 614     /* This returns 0 also if SHA1 is not available */
 615     return X509_NAME_hash_ex((X509_NAME *)a, NULL, NULL, NULL);
 616 }
 617
 618 STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
 619                                                 OSSL_LIB_CTX *libctx,
 620                                                 const char *propq)
 621 {
 622     BIO *in = BIO_new(BIO_s_file());
 623     X509 *x = NULL;
 624     X509_NAME *xn = NULL;
 625     STACK_OF(X509_NAME) *ret = NULL;
 626     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 627     OSSL_LIB_CTX *prev_libctx = NULL;
 628
 629     if ((name_hash == NULL) || (in == NULL)) {
 630         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 631         goto err;
 632     }
 633
 634     x = X509_new_ex(libctx, propq);
 635     if (x == NULL) {
 636         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 637         goto err;
 638     }
 639     if (BIO_read_filename(in, file) <= 0)
 640         goto err;
 641
 642     /* Internally lh_X509_NAME_retrieve() needs the libctx to retrieve SHA1 */
 643     prev_libctx = OSSL_LIB_CTX_set0_default(libctx);
 644     for (;;) {
 645         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 646             break;
 647         if (ret == NULL) {
 648             ret = sk_X509_NAME_new_null();
 649             if (ret == NULL) {
 650                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 651                 goto err;
 652             }
 653         }
 654         if ((xn = X509_get_subject_name(x)) == NULL)
 655             goto err;
 656         /* check for duplicates */
 657         xn = X509_NAME_dup(xn);
 658         if (xn == NULL)
 659             goto err;
 660         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 661             /* Duplicate. */
 662             X509_NAME_free(xn);
 663             xn = NULL;
 664         } else {
 665             lh_X509_NAME_insert(name_hash, xn);
 666             if (!sk_X509_NAME_push(ret, xn))
 667                 goto err;
 668         }
 669     }
 670     goto done;
 671
 672  err:
 673     X509_NAME_free(xn);
 674     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 675     ret = NULL;
 676  done:
 677     /* restore the old libctx */
 678     OSSL_LIB_CTX_set0_default(prev_libctx);
 679     BIO_free(in);
 680     X509_free(x);
 681     lh_X509_NAME_free(name_hash);
 682     if (ret != NULL)
 683         ERR_clear_error();
 684     return ret;
 685 }
 686
 687 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 688 {
 689     return SSL_load_client_CA_file_ex(file, NULL, NULL);
 690 }
 691
 692 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 693                                         const char *file)
 694 {
 695     BIO *in;
 696     X509 *x = NULL;
 697     X509_NAME *xn = NULL;
 698     int ret = 1;
 699     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 700
 701     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 702
 703     in = BIO_new(BIO_s_file());
 704
 705     if (in == NULL) {
 706         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 707         goto err;
 708     }
 709
 710     if (BIO_read_filename(in, file) <= 0)
 711         goto err;
 712
 713     for (;;) {
 714         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 715             break;
 716         if ((xn = X509_get_subject_name(x)) == NULL)
 717             goto err;
 718         xn = X509_NAME_dup(xn);
 719         if (xn == NULL)
 720             goto err;
 721         if (sk_X509_NAME_find(stack, xn) >= 0) {
 722             /* Duplicate. */
 723             X509_NAME_free(xn);
 724         } else if (!sk_X509_NAME_push(stack, xn)) {
 725             X509_NAME_free(xn);
 726             goto err;
 727         }
 728     }
 729
 730     ERR_clear_error();
 731     goto done;
 732
 733  err:
 734     ret = 0;
 735  done:
 736     BIO_free(in);
 737     X509_free(x);
 738     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 739     return ret;
 740 }
 741
 742 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 743                                        const char *dir)
 744 {
 745     OPENSSL_DIR_CTX *d = NULL;
 746     const char *filename;
 747     int ret = 0;
 748
 749     /* Note that a side effect is that the CAs will be sorted by name */
 750
 751     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 752         char buf[1024];
 753         int r;
 754
 755         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 756             ERR_raise(ERR_LIB_SSL, 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         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 772                        "calling OPENSSL_dir_read(%s)", dir);
 773         ERR_raise(ERR_LIB_SSL, 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 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
 787                               const char *uri, int depth)
 788 {
 789     int ok = 1;
 790     OSSL_STORE_CTX *ctx = NULL;
 791     X509 *x = NULL;
 792     X509_NAME *xn = NULL;
 793
 794     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
 795         goto err;
 796
 797     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
 798         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
 799         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
 800
 801         if (info == NULL)
 802             continue;
 803
 804         if (infotype == OSSL_STORE_INFO_NAME) {
 805             /*
 806              * This is an entry in the "directory" represented by the current
 807              * uri.  if |depth| allows, dive into it.
 808              */
 809             if (depth > 0)
 810                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
 811                                         depth - 1);
 812         } else if (infotype == OSSL_STORE_INFO_CERT) {
 813             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
 814                 || (xn = X509_get_subject_name(x)) == NULL
 815                 || (xn = X509_NAME_dup(xn)) == NULL)
 816                 goto err;
 817             if (sk_X509_NAME_find(stack, xn) >= 0) {
 818                 /* Duplicate. */
 819                 X509_NAME_free(xn);
 820             } else if (!sk_X509_NAME_push(stack, xn)) {
 821                 X509_NAME_free(xn);
 822                 goto err;
 823             }
 824         }
 825
 826         OSSL_STORE_INFO_free(info);
 827     }
 828
 829     ERR_clear_error();
 830     goto done;
 831
 832  err:
 833     ok = 0;
 834  done:
 835     OSSL_STORE_close(ctx);
 836
 837     return ok;
 838 }
 839
 840 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 841                                          const char *store)
 842 {
 843     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
 844         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 845     int ret = add_uris_recursive(stack, store, 1);
 846
 847     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 848     return ret;
 849 }
 850
 851 /* Build a certificate chain for current certificate */
 852 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 853 {
 854     CERT *c = s ? s->cert : ctx->cert;
 855     CERT_PKEY *cpk = c->key;
 856     X509_STORE *chain_store = NULL;
 857     X509_STORE_CTX *xs_ctx = NULL;
 858     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 859     X509 *x;
 860     SSL_CTX *real_ctx = (s == NULL) ? ctx : s->ctx;
 861     int i, rv = 0;
 862
 863     if (!cpk->x509) {
 864         ERR_raise(ERR_LIB_SSL, SSL_R_NO_CERTIFICATE_SET);
 865         goto err;
 866     }
 867     /* Rearranging and check the chain: add everything to a store */
 868     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 869         chain_store = X509_STORE_new();
 870         if (chain_store == NULL)
 871             goto err;
 872         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 873             x = sk_X509_value(cpk->chain, i);
 874             if (!X509_STORE_add_cert(chain_store, x))
 875                 goto err;
 876         }
 877         /* Add EE cert too: it might be self signed */
 878         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 879             goto err;
 880     } else {
 881         if (c->chain_store)
 882             chain_store = c->chain_store;
 883         else if (s)
 884             chain_store = s->ctx->cert_store;
 885         else
 886             chain_store = ctx->cert_store;
 887
 888         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 889             untrusted = cpk->chain;
 890     }
 891
 892     xs_ctx = X509_STORE_CTX_new_ex(real_ctx->libctx, real_ctx->propq);
 893     if (xs_ctx == NULL) {
 894         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 895         goto err;
 896     }
 897     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 898         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 899         goto err;
 900     }
 901     /* Set suite B flags if needed */
 902     X509_STORE_CTX_set_flags(xs_ctx,
 903                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 904
 905     i = X509_verify_cert(xs_ctx);
 906     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 907         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 908             ERR_clear_error();
 909         i = 1;
 910         rv = 2;
 911     }
 912     if (i > 0)
 913         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 914     if (i <= 0) {
 915         i = X509_STORE_CTX_get_error(xs_ctx);
 916         ERR_raise_data(ERR_LIB_SSL, SSL_R_CERTIFICATE_VERIFY_FAILED,
 917                        "Verify error:%s", X509_verify_cert_error_string(i));
 918
 919         goto err;
 920     }
 921     /* Remove EE certificate from chain */
 922     x = sk_X509_shift(chain);
 923     X509_free(x);
 924     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 925         if (sk_X509_num(chain) > 0) {
 926             /* See if last cert is self signed */
 927             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 928             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 929                 x = sk_X509_pop(chain);
 930                 X509_free(x);
 931             }
 932         }
 933     }
 934     /*
 935      * Check security level of all CA certificates: EE will have been checked
 936      * already.
 937      */
 938     for (i = 0; i < sk_X509_num(chain); i++) {
 939         x = sk_X509_value(chain, i);
 940         rv = ssl_security_cert(s, ctx, x, 0, 0);
 941         if (rv != 1) {
 942             ERR_raise(ERR_LIB_SSL, rv);
 943             OSSL_STACK_OF_X509_free(chain);
 944             rv = 0;
 945             goto err;
 946         }
 947     }
 948     OSSL_STACK_OF_X509_free(cpk->chain);
 949     cpk->chain = chain;
 950     if (rv == 0)
 951         rv = 1;
 952  err:
 953     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 954         X509_STORE_free(chain_store);
 955     X509_STORE_CTX_free(xs_ctx);
 956
 957     return rv;
 958 }
 959
 960 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 961 {
 962     X509_STORE **pstore;
 963     if (chain)
 964         pstore = &c->chain_store;
 965     else
 966         pstore = &c->verify_store;
 967     X509_STORE_free(*pstore);
 968     *pstore = store;
 969     if (ref && store)
 970         X509_STORE_up_ref(store);
 971     return 1;
 972 }
 973
 974 int ssl_cert_get_cert_store(CERT *c, X509_STORE **pstore, int chain)
 975 {
 976     *pstore = (chain ? c->chain_store : c->verify_store);
 977     return 1;
 978 }
 979
 980 int ssl_get_security_level_bits(const SSL *s, const SSL_CTX *ctx, int *levelp)
 981 {
 982     int level;
 983     /*
 984      * note that there's a corresponding minbits_table
 985      * in crypto/x509/x509_vfy.c that's used for checking the security level
 986      * of RSA and DSA keys
 987      */
 988     static const int minbits_table[5 + 1] = { 0, 80, 112, 128, 192, 256 };
 989
 990     if (ctx != NULL)
 991         level = SSL_CTX_get_security_level(ctx);
 992     else
 993         level = SSL_get_security_level(s);
 994
 995     if (level > 5)
 996         level = 5;
 997     else if (level < 0)
 998         level = 0;
 999
1000     if (levelp != NULL)
1001         *levelp = level;
1002
1003     return minbits_table[level];
1004 }
1005
1006 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
1007                                          int op, int bits, int nid, void *other,
1008                                          void *ex)
1009 {
1010     int level, minbits, pfs_mask;
1011
1012     minbits = ssl_get_security_level_bits(s, ctx, &level);
1013
1014     if (level == 0) {
1015         /*
1016          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
1017          * anything goes.
1018          */
1019         if (op == SSL_SECOP_TMP_DH && bits < 80)
1020             return 0;
1021         return 1;
1022     }
1023     switch (op) {
1024     case SSL_SECOP_CIPHER_SUPPORTED:
1025     case SSL_SECOP_CIPHER_SHARED:
1026     case SSL_SECOP_CIPHER_CHECK:
1027         {
1028             const SSL_CIPHER *c = other;
1029             /* No ciphers below security level */
1030             if (bits < minbits)
1031                 return 0;
1032             /* No unauthenticated ciphersuites */
1033             if (c->algorithm_auth & SSL_aNULL)
1034                 return 0;
1035             /* No MD5 mac ciphersuites */
1036             if (c->algorithm_mac & SSL_MD5)
1037                 return 0;
1038             /* SHA1 HMAC is 160 bits of security */
1039             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
1040                 return 0;
1041             /* Level 3: forward secure ciphersuites only */
1042             pfs_mask = SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK;
1043             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
1044                                !(c->algorithm_mkey & pfs_mask))
1045                 return 0;
1046             break;
1047         }
1048     case SSL_SECOP_VERSION:
1049         if (!SSL_IS_DTLS(s)) {
1050             /* SSLv3 not allowed at level 2 */
1051             if (nid <= SSL3_VERSION && level >= 2)
1052                 return 0;
1053             /* TLS v1.1 and above only for level 3 */
1054             if (nid <= TLS1_VERSION && level >= 3)
1055                 return 0;
1056             /* TLS v1.2 only for level 4 and above */
1057             if (nid <= TLS1_1_VERSION && level >= 4)
1058                 return 0;
1059         } else {
1060             /* DTLS v1.2 only for level 4 and above */
1061             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
1062                 return 0;
1063         }
1064         break;
1065
1066     case SSL_SECOP_COMPRESSION:
1067         if (level >= 2)
1068             return 0;
1069         break;
1070     case SSL_SECOP_TICKET:
1071         if (level >= 3)
1072             return 0;
1073         break;
1074     default:
1075         if (bits < minbits)
1076             return 0;
1077     }
1078     return 1;
1079 }
1080
1081 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
1082 {
1083     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1084 }
1085
1086 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1087 {
1088     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1089                              ctx->cert->sec_ex);
1090 }
1091
1092 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1093 {
1094     size_t i;
1095
1096     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1097         if (ssl_cert_info[i].nid == nid) {
1098             *pidx = i;
1099             return 1;
1100         }
1101     }
1102
1103     return 0;
1104 }
1105
1106 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1107 {
1108     size_t i;
1109
1110     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1111         const SSL_CERT_LOOKUP *tmp_lu = &ssl_cert_info[i];
1112
1113         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1114             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1115             if (pidx != NULL)
1116                 *pidx = i;
1117             return tmp_lu;
1118         }
1119     }
1120
1121     return NULL;
1122 }
1123
1124 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1125 {
1126     if (idx >= OSSL_NELEM(ssl_cert_info))
1127         return NULL;
1128     return &ssl_cert_info[idx];
1129 }