ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2021 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 #ifndef OPENSSL_NO_DH
  99     ret->dh_tmp_cb = cert->dh_tmp_cb;
 100 #endif
 101     ret->dh_tmp_auto = cert->dh_tmp_auto;
 102
 103     for (i = 0; i < SSL_PKEY_NUM; i++) {
 104         CERT_PKEY *cpk = cert->pkeys + i;
 105         CERT_PKEY *rpk = ret->pkeys + i;
 106         if (cpk->x509 != NULL) {
 107             rpk->x509 = cpk->x509;
 108             X509_up_ref(rpk->x509);
 109         }
 110
 111         if (cpk->privatekey != NULL) {
 112             rpk->privatekey = cpk->privatekey;
 113             EVP_PKEY_up_ref(cpk->privatekey);
 114         }
 115
 116         if (cpk->chain) {
 117             rpk->chain = X509_chain_up_ref(cpk->chain);
 118             if (!rpk->chain) {
 119                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 120                 goto err;
 121             }
 122         }
 123         if (cert->pkeys[i].serverinfo != NULL) {
 124             /* Just copy everything. */
 125             ret->pkeys[i].serverinfo =
 126                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
 127             if (ret->pkeys[i].serverinfo == NULL) {
 128                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 129                 goto err;
 130             }
 131             ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
 132             memcpy(ret->pkeys[i].serverinfo,
 133                    cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
 134         }
 135     }
 136
 137     /* Configured sigalgs copied across */
 138     if (cert->conf_sigalgs) {
 139         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
 140                                            * sizeof(*cert->conf_sigalgs));
 141         if (ret->conf_sigalgs == NULL)
 142             goto err;
 143         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
 144                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
 145         ret->conf_sigalgslen = cert->conf_sigalgslen;
 146     } else
 147         ret->conf_sigalgs = NULL;
 148
 149     if (cert->client_sigalgs) {
 150         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
 151                                              * sizeof(*cert->client_sigalgs));
 152         if (ret->client_sigalgs == NULL)
 153             goto err;
 154         memcpy(ret->client_sigalgs, cert->client_sigalgs,
 155                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
 156         ret->client_sigalgslen = cert->client_sigalgslen;
 157     } else
 158         ret->client_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     EVP_PKEY_free(c->dh_tmp);
 237
 238     ssl_cert_clear_certs(c);
 239     OPENSSL_free(c->conf_sigalgs);
 240     OPENSSL_free(c->client_sigalgs);
 241     OPENSSL_free(c->ctype);
 242     X509_STORE_free(c->verify_store);
 243     X509_STORE_free(c->chain_store);
 244     custom_exts_free(&c->custext);
 245 #ifndef OPENSSL_NO_PSK
 246     OPENSSL_free(c->psk_identity_hint);
 247 #endif
 248     CRYPTO_THREAD_lock_free(c->lock);
 249     OPENSSL_free(c);
 250 }
 251
 252 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 253 {
 254     int i, r;
 255     CERT_PKEY *cpk = s != NULL ? s->cert->key : ctx->cert->key;
 256
 257     if (!cpk)
 258         return 0;
 259     for (i = 0; i < sk_X509_num(chain); i++) {
 260         X509 *x = sk_X509_value(chain, i);
 261
 262         r = ssl_security_cert(s, ctx, x, 0, 0);
 263         if (r != 1) {
 264             ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, 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_ex(s->ctx->libctx, s->ctx->propq);
 383     if (ctx == NULL) {
 384         ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, 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             ERR_raise(ERR_LIB_SSL, 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         ERR_raise(ERR_LIB_SSL, 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             ERR_raise(ERR_LIB_SSL, 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     set0_CA_list(&ctx->client_ca_names, name_list);
 505 }
 506
 507 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 508 {
 509     return ctx->client_ca_names;
 510 }
 511
 512 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 513 {
 514     set0_CA_list(&s->client_ca_names, name_list);
 515 }
 516
 517 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 518 {
 519     return s->s3.tmp.peer_ca_names;
 520 }
 521
 522 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 523 {
 524     if (!s->server)
 525         return s->s3.tmp.peer_ca_names;
 526     return s->client_ca_names != NULL ?  s->client_ca_names
 527                                       : s->ctx->client_ca_names;
 528 }
 529
 530 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 531 {
 532     X509_NAME *name;
 533
 534     if (x == NULL)
 535         return 0;
 536     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 537         return 0;
 538
 539     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 540         return 0;
 541
 542     if (!sk_X509_NAME_push(*sk, name)) {
 543         X509_NAME_free(name);
 544         return 0;
 545     }
 546     return 1;
 547 }
 548
 549 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 550 {
 551     return add_ca_name(&ssl->ca_names, x);
 552 }
 553
 554 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 555 {
 556     return add_ca_name(&ctx->ca_names, x);
 557 }
 558
 559 /*
 560  * The following two are older names are to be replaced with
 561  * SSL(_CTX)_add1_to_CA_list
 562  */
 563 int SSL_add_client_CA(SSL *ssl, X509 *x)
 564 {
 565     return add_ca_name(&ssl->client_ca_names, x);
 566 }
 567
 568 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 569 {
 570     return add_ca_name(&ctx->client_ca_names, x);
 571 }
 572
 573 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 574 {
 575     unsigned char *abuf = NULL, *bbuf = NULL;
 576     int alen, blen, ret;
 577
 578     /* X509_NAME_cmp() itself casts away constness in this way, so
 579      * assume it's safe:
 580      */
 581     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 582     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 583
 584     if (alen < 0 || blen < 0)
 585         ret = -2;
 586     else if (alen != blen)
 587         ret = alen - blen;
 588     else /* alen == blen */
 589         ret = memcmp(abuf, bbuf, alen);
 590
 591     OPENSSL_free(abuf);
 592     OPENSSL_free(bbuf);
 593
 594     return ret;
 595 }
 596
 597 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 598 {
 599     return xname_cmp(*a, *b);
 600 }
 601
 602 static unsigned long xname_hash(const X509_NAME *a)
 603 {
 604     /* This returns 0 also if SHA1 is not available */
 605     return X509_NAME_hash_ex((X509_NAME *)a, NULL, NULL, NULL);
 606 }
 607
 608 STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
 609                                                 OSSL_LIB_CTX *libctx,
 610                                                 const char *propq)
 611 {
 612     BIO *in = BIO_new(BIO_s_file());
 613     X509 *x = NULL;
 614     X509_NAME *xn = NULL;
 615     STACK_OF(X509_NAME) *ret = NULL;
 616     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 617     OSSL_LIB_CTX *prev_libctx = NULL;
 618
 619     if ((name_hash == NULL) || (in == NULL)) {
 620         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 621         goto err;
 622     }
 623
 624     x = X509_new_ex(libctx, propq);
 625     if (x == NULL) {
 626         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 627         goto err;
 628     }
 629     if (!BIO_read_filename(in, file))
 630         goto err;
 631
 632     /* Internally lh_X509_NAME_retrieve() needs the libctx to retrieve SHA1 */
 633     prev_libctx = OSSL_LIB_CTX_set0_default(libctx);
 634     for (;;) {
 635         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 636             break;
 637         if (ret == NULL) {
 638             ret = sk_X509_NAME_new_null();
 639             if (ret == NULL) {
 640                 ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 641                 goto err;
 642             }
 643         }
 644         if ((xn = X509_get_subject_name(x)) == NULL)
 645             goto err;
 646         /* check for duplicates */
 647         xn = X509_NAME_dup(xn);
 648         if (xn == NULL)
 649             goto err;
 650         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 651             /* Duplicate. */
 652             X509_NAME_free(xn);
 653             xn = NULL;
 654         } else {
 655             lh_X509_NAME_insert(name_hash, xn);
 656             if (!sk_X509_NAME_push(ret, xn))
 657                 goto err;
 658         }
 659     }
 660     goto done;
 661
 662  err:
 663     X509_NAME_free(xn);
 664     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 665     ret = NULL;
 666  done:
 667     /* restore the old libctx */
 668     OSSL_LIB_CTX_set0_default(prev_libctx);
 669     BIO_free(in);
 670     X509_free(x);
 671     lh_X509_NAME_free(name_hash);
 672     if (ret != NULL)
 673         ERR_clear_error();
 674     return ret;
 675 }
 676
 677 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 678 {
 679     return SSL_load_client_CA_file_ex(file, NULL, NULL);
 680 }
 681
 682 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 683                                         const char *file)
 684 {
 685     BIO *in;
 686     X509 *x = NULL;
 687     X509_NAME *xn = NULL;
 688     int ret = 1;
 689     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 690
 691     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 692
 693     in = BIO_new(BIO_s_file());
 694
 695     if (in == NULL) {
 696         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 697         goto err;
 698     }
 699
 700     if (!BIO_read_filename(in, file))
 701         goto err;
 702
 703     for (;;) {
 704         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 705             break;
 706         if ((xn = X509_get_subject_name(x)) == NULL)
 707             goto err;
 708         xn = X509_NAME_dup(xn);
 709         if (xn == NULL)
 710             goto err;
 711         if (sk_X509_NAME_find(stack, xn) >= 0) {
 712             /* Duplicate. */
 713             X509_NAME_free(xn);
 714         } else if (!sk_X509_NAME_push(stack, xn)) {
 715             X509_NAME_free(xn);
 716             goto err;
 717         }
 718     }
 719
 720     ERR_clear_error();
 721     goto done;
 722
 723  err:
 724     ret = 0;
 725  done:
 726     BIO_free(in);
 727     X509_free(x);
 728     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 729     return ret;
 730 }
 731
 732 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 733                                        const char *dir)
 734 {
 735     OPENSSL_DIR_CTX *d = NULL;
 736     const char *filename;
 737     int ret = 0;
 738
 739     /* Note that a side effect is that the CAs will be sorted by name */
 740
 741     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 742         char buf[1024];
 743         int r;
 744
 745         if (strlen(dir) + strlen(filename) + 2 > sizeof(buf)) {
 746             ERR_raise(ERR_LIB_SSL, SSL_R_PATH_TOO_LONG);
 747             goto err;
 748         }
 749 #ifdef OPENSSL_SYS_VMS
 750         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 751 #else
 752         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 753 #endif
 754         if (r <= 0 || r >= (int)sizeof(buf))
 755             goto err;
 756         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 757             goto err;
 758     }
 759
 760     if (errno) {
 761         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 762                        "calling OPENSSL_dir_read(%s)", dir);
 763         ERR_raise(ERR_LIB_SSL, ERR_R_SYS_LIB);
 764         goto err;
 765     }
 766
 767     ret = 1;
 768
 769  err:
 770     if (d)
 771         OPENSSL_DIR_end(&d);
 772
 773     return ret;
 774 }
 775
 776 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
 777                               const char *uri, int depth)
 778 {
 779     int ok = 1;
 780     OSSL_STORE_CTX *ctx = NULL;
 781     X509 *x = NULL;
 782     X509_NAME *xn = NULL;
 783
 784     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
 785         goto err;
 786
 787     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
 788         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
 789         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
 790
 791         if (info == NULL)
 792             continue;
 793
 794         if (infotype == OSSL_STORE_INFO_NAME) {
 795             /*
 796              * This is an entry in the "directory" represented by the current
 797              * uri.  if |depth| allows, dive into it.
 798              */
 799             if (depth > 0)
 800                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
 801                                         depth - 1);
 802         } else if (infotype == OSSL_STORE_INFO_CERT) {
 803             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
 804                 || (xn = X509_get_subject_name(x)) == NULL
 805                 || (xn = X509_NAME_dup(xn)) == NULL)
 806                 goto err;
 807             if (sk_X509_NAME_find(stack, xn) >= 0) {
 808                 /* Duplicate. */
 809                 X509_NAME_free(xn);
 810             } else if (!sk_X509_NAME_push(stack, xn)) {
 811                 X509_NAME_free(xn);
 812                 goto err;
 813             }
 814         }
 815
 816         OSSL_STORE_INFO_free(info);
 817     }
 818
 819     ERR_clear_error();
 820     goto done;
 821
 822  err:
 823     ok = 0;
 824  done:
 825     OSSL_STORE_close(ctx);
 826
 827     return ok;
 828 }
 829
 830 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 831                                          const char *store)
 832 {
 833     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
 834         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 835     int ret = add_uris_recursive(stack, store, 1);
 836
 837     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 838     return ret;
 839 }
 840
 841 /* Build a certificate chain for current certificate */
 842 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 843 {
 844     CERT *c = s ? s->cert : ctx->cert;
 845     CERT_PKEY *cpk = c->key;
 846     X509_STORE *chain_store = NULL;
 847     X509_STORE_CTX *xs_ctx = NULL;
 848     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 849     X509 *x;
 850     SSL_CTX *real_ctx = (s == NULL) ? ctx : s->ctx;
 851     int i, rv = 0;
 852
 853     if (!cpk->x509) {
 854         ERR_raise(ERR_LIB_SSL, SSL_R_NO_CERTIFICATE_SET);
 855         goto err;
 856     }
 857     /* Rearranging and check the chain: add everything to a store */
 858     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 859         chain_store = X509_STORE_new();
 860         if (chain_store == NULL)
 861             goto err;
 862         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 863             x = sk_X509_value(cpk->chain, i);
 864             if (!X509_STORE_add_cert(chain_store, x))
 865                 goto err;
 866         }
 867         /* Add EE cert too: it might be self signed */
 868         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 869             goto err;
 870     } else {
 871         if (c->chain_store)
 872             chain_store = c->chain_store;
 873         else if (s)
 874             chain_store = s->ctx->cert_store;
 875         else
 876             chain_store = ctx->cert_store;
 877
 878         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 879             untrusted = cpk->chain;
 880     }
 881
 882     xs_ctx = X509_STORE_CTX_new_ex(real_ctx->libctx, ctx->propq);
 883     if (xs_ctx == NULL) {
 884         ERR_raise(ERR_LIB_SSL, ERR_R_MALLOC_FAILURE);
 885         goto err;
 886     }
 887     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 888         ERR_raise(ERR_LIB_SSL, ERR_R_X509_LIB);
 889         goto err;
 890     }
 891     /* Set suite B flags if needed */
 892     X509_STORE_CTX_set_flags(xs_ctx,
 893                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 894
 895     i = X509_verify_cert(xs_ctx);
 896     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 897         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 898             ERR_clear_error();
 899         i = 1;
 900         rv = 2;
 901     }
 902     if (i > 0)
 903         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 904     if (i <= 0) {
 905         i = X509_STORE_CTX_get_error(xs_ctx);
 906         ERR_raise_data(ERR_LIB_SSL, SSL_R_CERTIFICATE_VERIFY_FAILED,
 907                        "Verify error:%s", X509_verify_cert_error_string(i));
 908
 909         goto err;
 910     }
 911     /* Remove EE certificate from chain */
 912     x = sk_X509_shift(chain);
 913     X509_free(x);
 914     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 915         if (sk_X509_num(chain) > 0) {
 916             /* See if last cert is self signed */
 917             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 918             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 919                 x = sk_X509_pop(chain);
 920                 X509_free(x);
 921             }
 922         }
 923     }
 924     /*
 925      * Check security level of all CA certificates: EE will have been checked
 926      * already.
 927      */
 928     for (i = 0; i < sk_X509_num(chain); i++) {
 929         x = sk_X509_value(chain, i);
 930         rv = ssl_security_cert(s, ctx, x, 0, 0);
 931         if (rv != 1) {
 932             ERR_raise(ERR_LIB_SSL, rv);
 933             sk_X509_pop_free(chain, X509_free);
 934             rv = 0;
 935             goto err;
 936         }
 937     }
 938     sk_X509_pop_free(cpk->chain, X509_free);
 939     cpk->chain = chain;
 940     if (rv == 0)
 941         rv = 1;
 942  err:
 943     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 944         X509_STORE_free(chain_store);
 945     X509_STORE_CTX_free(xs_ctx);
 946
 947     return rv;
 948 }
 949
 950 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 951 {
 952     X509_STORE **pstore;
 953     if (chain)
 954         pstore = &c->chain_store;
 955     else
 956         pstore = &c->verify_store;
 957     X509_STORE_free(*pstore);
 958     *pstore = store;
 959     if (ref && store)
 960         X509_STORE_up_ref(store);
 961     return 1;
 962 }
 963
 964 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 965                                          int op, int bits, int nid, void *other,
 966                                          void *ex)
 967 {
 968     int level, minbits;
 969     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 970     if (ctx)
 971         level = SSL_CTX_get_security_level(ctx);
 972     else
 973         level = SSL_get_security_level(s);
 974
 975     if (level <= 0) {
 976         /*
 977          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 978          * anything goes.
 979          */
 980         if (op == SSL_SECOP_TMP_DH && bits < 80)
 981             return 0;
 982         return 1;
 983     }
 984     if (level > 5)
 985         level = 5;
 986     minbits = minbits_table[level - 1];
 987     switch (op) {
 988     case SSL_SECOP_CIPHER_SUPPORTED:
 989     case SSL_SECOP_CIPHER_SHARED:
 990     case SSL_SECOP_CIPHER_CHECK:
 991         {
 992             const SSL_CIPHER *c = other;
 993             /* No ciphers below security level */
 994             if (bits < minbits)
 995                 return 0;
 996             /* No unauthenticated ciphersuites */
 997             if (c->algorithm_auth & SSL_aNULL)
 998                 return 0;
 999             /* No MD5 mac ciphersuites */
1000             if (c->algorithm_mac & SSL_MD5)
1001                 return 0;
1002             /* SHA1 HMAC is 160 bits of security */
1003             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
1004                 return 0;
1005             /* Level 2: no RC4 */
1006             if (level >= 2 && c->algorithm_enc == SSL_RC4)
1007                 return 0;
1008             /* Level 3: forward secure ciphersuites only */
1009             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
1010                                !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
1011                 return 0;
1012             break;
1013         }
1014     case SSL_SECOP_VERSION:
1015         if (!SSL_IS_DTLS(s)) {
1016             /* SSLv3 not allowed at level 2 */
1017             if (nid <= SSL3_VERSION && level >= 2)
1018                 return 0;
1019             /* TLS v1.1 and above only for level 3 */
1020             if (nid <= TLS1_VERSION && level >= 3)
1021                 return 0;
1022             /* TLS v1.2 only for level 4 and above */
1023             if (nid <= TLS1_1_VERSION && level >= 4)
1024                 return 0;
1025         } else {
1026             /* DTLS v1.2 only for level 4 and above */
1027             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
1028                 return 0;
1029         }
1030         break;
1031
1032     case SSL_SECOP_COMPRESSION:
1033         if (level >= 2)
1034             return 0;
1035         break;
1036     case SSL_SECOP_TICKET:
1037         if (level >= 3)
1038             return 0;
1039         break;
1040     default:
1041         if (bits < minbits)
1042             return 0;
1043     }
1044     return 1;
1045 }
1046
1047 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
1048 {
1049     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1050 }
1051
1052 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1053 {
1054     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1055                              ctx->cert->sec_ex);
1056 }
1057
1058 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1059 {
1060     size_t i;
1061
1062     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1063         if (ssl_cert_info[i].nid == nid) {
1064             *pidx = i;
1065             return 1;
1066         }
1067     }
1068
1069     return 0;
1070 }
1071
1072 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1073 {
1074     size_t i;
1075
1076     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1077         const SSL_CERT_LOOKUP *tmp_lu = &ssl_cert_info[i];
1078
1079         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1080             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1081             if (pidx != NULL)
1082                 *pidx = i;
1083             return tmp_lu;
1084         }
1085     }
1086
1087     return NULL;
1088 }
1089
1090 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1091 {
1092     if (idx >= OSSL_NELEM(ssl_cert_info))
1093         return NULL;
1094     return &ssl_cert_info[idx];
1095 }