ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2020 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 != NULL ? s->cert->key : ctx->cert->key;
 257
 258     if (!cpk)
 259         return 0;
 260     for (i = 0; i < sk_X509_num(chain); i++) {
 261         X509 *x = sk_X509_value(chain, i);
 262
 263         r = ssl_security_cert(s, ctx, x, 0, 0);
 264         if (r != 1) {
 265             SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
 266             return 0;
 267         }
 268     }
 269     sk_X509_pop_free(cpk->chain, X509_free);
 270     cpk->chain = chain;
 271     return 1;
 272 }
 273
 274 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 275 {
 276     STACK_OF(X509) *dchain;
 277     if (!chain)
 278         return ssl_cert_set0_chain(s, ctx, NULL);
 279     dchain = X509_chain_up_ref(chain);
 280     if (!dchain)
 281         return 0;
 282     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 283         sk_X509_pop_free(dchain, X509_free);
 284         return 0;
 285     }
 286     return 1;
 287 }
 288
 289 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 290 {
 291     int r;
 292     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 293     if (!cpk)
 294         return 0;
 295     r = ssl_security_cert(s, ctx, x, 0, 0);
 296     if (r != 1) {
 297         SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
 298         return 0;
 299     }
 300     if (!cpk->chain)
 301         cpk->chain = sk_X509_new_null();
 302     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 303         return 0;
 304     return 1;
 305 }
 306
 307 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 308 {
 309     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 310         return 0;
 311     X509_up_ref(x);
 312     return 1;
 313 }
 314
 315 int ssl_cert_select_current(CERT *c, X509 *x)
 316 {
 317     int i;
 318     if (x == NULL)
 319         return 0;
 320     for (i = 0; i < SSL_PKEY_NUM; i++) {
 321         CERT_PKEY *cpk = c->pkeys + i;
 322         if (cpk->x509 == x && cpk->privatekey) {
 323             c->key = cpk;
 324             return 1;
 325         }
 326     }
 327
 328     for (i = 0; i < SSL_PKEY_NUM; i++) {
 329         CERT_PKEY *cpk = c->pkeys + i;
 330         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 331             c->key = cpk;
 332             return 1;
 333         }
 334     }
 335     return 0;
 336 }
 337
 338 int ssl_cert_set_current(CERT *c, long op)
 339 {
 340     int i, idx;
 341     if (!c)
 342         return 0;
 343     if (op == SSL_CERT_SET_FIRST)
 344         idx = 0;
 345     else if (op == SSL_CERT_SET_NEXT) {
 346         idx = (int)(c->key - c->pkeys + 1);
 347         if (idx >= SSL_PKEY_NUM)
 348             return 0;
 349     } else
 350         return 0;
 351     for (i = idx; i < SSL_PKEY_NUM; i++) {
 352         CERT_PKEY *cpk = c->pkeys + i;
 353         if (cpk->x509 && cpk->privatekey) {
 354             c->key = cpk;
 355             return 1;
 356         }
 357     }
 358     return 0;
 359 }
 360
 361 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 362 {
 363     c->cert_cb = cb;
 364     c->cert_cb_arg = arg;
 365 }
 366
 367 int ssl_verify_cert_chain(SSL *s, STACK_OF(X509) *sk)
 368 {
 369     X509 *x;
 370     int i = 0;
 371     X509_STORE *verify_store;
 372     X509_STORE_CTX *ctx = NULL;
 373     X509_VERIFY_PARAM *param;
 374
 375     if ((sk == NULL) || (sk_X509_num(sk) == 0))
 376         return 0;
 377
 378     if (s->cert->verify_store)
 379         verify_store = s->cert->verify_store;
 380     else
 381         verify_store = s->ctx->cert_store;
 382
 383     ctx = X509_STORE_CTX_new_ex(s->ctx->libctx, s->ctx->propq);
 384     if (ctx == NULL) {
 385         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 386         return 0;
 387     }
 388
 389     x = sk_X509_value(sk, 0);
 390     if (!X509_STORE_CTX_init(ctx, verify_store, x, sk)) {
 391         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_X509_LIB);
 392         goto end;
 393     }
 394     param = X509_STORE_CTX_get0_param(ctx);
 395     /*
 396      * XXX: Separate @AUTHSECLEVEL and @TLSSECLEVEL would be useful at some
 397      * point, for now a single @SECLEVEL sets the same policy for TLS crypto
 398      * and PKI authentication.
 399      */
 400     X509_VERIFY_PARAM_set_auth_level(param, SSL_get_security_level(s));
 401
 402     /* Set suite B flags if needed */
 403     X509_STORE_CTX_set_flags(ctx, tls1_suiteb(s));
 404     if (!X509_STORE_CTX_set_ex_data
 405         (ctx, SSL_get_ex_data_X509_STORE_CTX_idx(), s)) {
 406         goto end;
 407     }
 408
 409     /* Verify via DANE if enabled */
 410     if (DANETLS_ENABLED(&s->dane))
 411         X509_STORE_CTX_set0_dane(ctx, &s->dane);
 412
 413     /*
 414      * We need to inherit the verify parameters. These can be determined by
 415      * the context: if its a server it will verify SSL client certificates or
 416      * vice versa.
 417      */
 418
 419     X509_STORE_CTX_set_default(ctx, s->server ? "ssl_client" : "ssl_server");
 420     /*
 421      * Anything non-default in "s->param" should overwrite anything in the ctx.
 422      */
 423     X509_VERIFY_PARAM_set1(param, s->param);
 424
 425     if (s->verify_callback)
 426         X509_STORE_CTX_set_verify_cb(ctx, s->verify_callback);
 427
 428     if (s->ctx->app_verify_callback != NULL)
 429         i = s->ctx->app_verify_callback(ctx, s->ctx->app_verify_arg);
 430     else
 431         i = X509_verify_cert(ctx);
 432
 433     s->verify_result = X509_STORE_CTX_get_error(ctx);
 434     sk_X509_pop_free(s->verified_chain, X509_free);
 435     s->verified_chain = NULL;
 436     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 437         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 438         if (s->verified_chain == NULL) {
 439             SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 440             i = 0;
 441         }
 442     }
 443
 444     /* Move peername from the store context params to the SSL handle's */
 445     X509_VERIFY_PARAM_move_peername(s->param, param);
 446
 447  end:
 448     X509_STORE_CTX_free(ctx);
 449     return i;
 450 }
 451
 452 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 453                         STACK_OF(X509_NAME) *name_list)
 454 {
 455     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 456     *ca_list = name_list;
 457 }
 458
 459 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 460 {
 461     int i;
 462     const int num = sk_X509_NAME_num(sk);
 463     STACK_OF(X509_NAME) *ret;
 464     X509_NAME *name;
 465
 466     ret = sk_X509_NAME_new_reserve(NULL, num);
 467     if (ret == NULL) {
 468         SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 469         return NULL;
 470     }
 471     for (i = 0; i < num; i++) {
 472         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 473         if (name == NULL) {
 474             SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 475             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 476             return NULL;
 477         }
 478         sk_X509_NAME_push(ret, name);   /* Cannot fail after reserve call */
 479     }
 480     return ret;
 481 }
 482
 483 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 484 {
 485     set0_CA_list(&s->ca_names, name_list);
 486 }
 487
 488 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 489 {
 490     set0_CA_list(&ctx->ca_names, name_list);
 491 }
 492
 493 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 494 {
 495     return ctx->ca_names;
 496 }
 497
 498 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 499 {
 500     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 501 }
 502
 503 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 504 {
 505     set0_CA_list(&ctx->client_ca_names, name_list);
 506 }
 507
 508 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 509 {
 510     return ctx->client_ca_names;
 511 }
 512
 513 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 514 {
 515     set0_CA_list(&s->client_ca_names, name_list);
 516 }
 517
 518 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 519 {
 520     return s->s3.tmp.peer_ca_names;
 521 }
 522
 523 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 524 {
 525     if (!s->server)
 526         return s->s3.tmp.peer_ca_names;
 527     return s->client_ca_names != NULL ?  s->client_ca_names
 528                                       : s->ctx->client_ca_names;
 529 }
 530
 531 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 532 {
 533     X509_NAME *name;
 534
 535     if (x == NULL)
 536         return 0;
 537     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 538         return 0;
 539
 540     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 541         return 0;
 542
 543     if (!sk_X509_NAME_push(*sk, name)) {
 544         X509_NAME_free(name);
 545         return 0;
 546     }
 547     return 1;
 548 }
 549
 550 int SSL_add1_to_CA_list(SSL *ssl, const X509 *x)
 551 {
 552     return add_ca_name(&ssl->ca_names, x);
 553 }
 554
 555 int SSL_CTX_add1_to_CA_list(SSL_CTX *ctx, const X509 *x)
 556 {
 557     return add_ca_name(&ctx->ca_names, x);
 558 }
 559
 560 /*
 561  * The following two are older names are to be replaced with
 562  * SSL(_CTX)_add1_to_CA_list
 563  */
 564 int SSL_add_client_CA(SSL *ssl, X509 *x)
 565 {
 566     return add_ca_name(&ssl->client_ca_names, x);
 567 }
 568
 569 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 570 {
 571     return add_ca_name(&ctx->client_ca_names, x);
 572 }
 573
 574 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 575 {
 576     unsigned char *abuf = NULL, *bbuf = NULL;
 577     int alen, blen, ret;
 578
 579     /* X509_NAME_cmp() itself casts away constness in this way, so
 580      * assume it's safe:
 581      */
 582     alen = i2d_X509_NAME((X509_NAME *)a, &abuf);
 583     blen = i2d_X509_NAME((X509_NAME *)b, &bbuf);
 584
 585     if (alen < 0 || blen < 0)
 586         ret = -2;
 587     else if (alen != blen)
 588         ret = alen - blen;
 589     else /* alen == blen */
 590         ret = memcmp(abuf, bbuf, alen);
 591
 592     OPENSSL_free(abuf);
 593     OPENSSL_free(bbuf);
 594
 595     return ret;
 596 }
 597
 598 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 599 {
 600     return xname_cmp(*a, *b);
 601 }
 602
 603 static unsigned long xname_hash(const X509_NAME *a)
 604 {
 605     return X509_NAME_hash((X509_NAME *)a);
 606 }
 607
 608 STACK_OF(X509_NAME) *SSL_load_client_CA_file_ex(const char *file,
 609                                                 OPENSSL_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     OPENSSL_CTX *prev_libctx = NULL;
 618
 619     if ((name_hash == NULL) || (in == NULL)) {
 620         SSLerr(0, ERR_R_MALLOC_FAILURE);
 621         goto err;
 622     }
 623
 624     x = X509_new_ex(libctx, propq);
 625     if (x == NULL) {
 626         SSLerr(0, 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 = OPENSSL_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                 SSLerr(0, 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     OPENSSL_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         SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, 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             SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
 747                    SSL_R_PATH_TOO_LONG);
 748             goto err;
 749         }
 750 #ifdef OPENSSL_SYS_VMS
 751         r = BIO_snprintf(buf, sizeof(buf), "%s%s", dir, filename);
 752 #else
 753         r = BIO_snprintf(buf, sizeof(buf), "%s/%s", dir, filename);
 754 #endif
 755         if (r <= 0 || r >= (int)sizeof(buf))
 756             goto err;
 757         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 758             goto err;
 759     }
 760
 761     if (errno) {
 762         ERR_raise_data(ERR_LIB_SYS, get_last_sys_error(),
 763                        "calling OPENSSL_dir_read(%s)",
 764                        dir);
 765         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
 766         goto err;
 767     }
 768
 769     ret = 1;
 770
 771  err:
 772     if (d)
 773         OPENSSL_DIR_end(&d);
 774
 775     return ret;
 776 }
 777
 778 static int add_uris_recursive(STACK_OF(X509_NAME) *stack,
 779                               const char *uri, int depth)
 780 {
 781     int ok = 1;
 782     OSSL_STORE_CTX *ctx = NULL;
 783     X509 *x = NULL;
 784     X509_NAME *xn = NULL;
 785
 786     if ((ctx = OSSL_STORE_open(uri, NULL, NULL, NULL, NULL)) == NULL)
 787         goto err;
 788
 789     while (!OSSL_STORE_eof(ctx) && !OSSL_STORE_error(ctx)) {
 790         OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
 791         int infotype = info == 0 ? 0 : OSSL_STORE_INFO_get_type(info);
 792
 793         if (info == NULL)
 794             continue;
 795
 796         if (infotype == OSSL_STORE_INFO_NAME) {
 797             /*
 798              * This is an entry in the "directory" represented by the current
 799              * uri.  if |depth| allows, dive into it.
 800              */
 801             if (depth > 0)
 802                 ok = add_uris_recursive(stack, OSSL_STORE_INFO_get0_NAME(info),
 803                                         depth - 1);
 804         } else if (infotype == OSSL_STORE_INFO_CERT) {
 805             if ((x = OSSL_STORE_INFO_get0_CERT(info)) == NULL
 806                 || (xn = X509_get_subject_name(x)) == NULL
 807                 || (xn = X509_NAME_dup(xn)) == NULL)
 808                 goto err;
 809             if (sk_X509_NAME_find(stack, xn) >= 0) {
 810                 /* Duplicate. */
 811                 X509_NAME_free(xn);
 812             } else if (!sk_X509_NAME_push(stack, xn)) {
 813                 X509_NAME_free(xn);
 814                 goto err;
 815             }
 816         }
 817
 818         OSSL_STORE_INFO_free(info);
 819     }
 820
 821     ERR_clear_error();
 822     goto done;
 823
 824  err:
 825     ok = 0;
 826  done:
 827     OSSL_STORE_close(ctx);
 828
 829     return ok;
 830 }
 831
 832 int SSL_add_store_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 833                                          const char *store)
 834 {
 835     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b)
 836         = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 837     int ret = add_uris_recursive(stack, store, 1);
 838
 839     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 840     return ret;
 841 }
 842
 843 /* Build a certificate chain for current certificate */
 844 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 845 {
 846     CERT *c = s ? s->cert : ctx->cert;
 847     CERT_PKEY *cpk = c->key;
 848     X509_STORE *chain_store = NULL;
 849     X509_STORE_CTX *xs_ctx = NULL;
 850     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 851     X509 *x;
 852     SSL_CTX *real_ctx = (s == NULL) ? ctx : s->ctx;
 853     int i, rv = 0;
 854
 855     if (!cpk->x509) {
 856         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
 857         goto err;
 858     }
 859     /* Rearranging and check the chain: add everything to a store */
 860     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 861         chain_store = X509_STORE_new();
 862         if (chain_store == NULL)
 863             goto err;
 864         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 865             x = sk_X509_value(cpk->chain, i);
 866             if (!X509_STORE_add_cert(chain_store, x))
 867                 goto err;
 868         }
 869         /* Add EE cert too: it might be self signed */
 870         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 871             goto err;
 872     } else {
 873         if (c->chain_store)
 874             chain_store = c->chain_store;
 875         else if (s)
 876             chain_store = s->ctx->cert_store;
 877         else
 878             chain_store = ctx->cert_store;
 879
 880         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 881             untrusted = cpk->chain;
 882     }
 883
 884     xs_ctx = X509_STORE_CTX_new_ex(real_ctx->libctx, ctx->propq);
 885     if (xs_ctx == NULL) {
 886         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 887         goto err;
 888     }
 889     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 890         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
 891         goto err;
 892     }
 893     /* Set suite B flags if needed */
 894     X509_STORE_CTX_set_flags(xs_ctx,
 895                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 896
 897     i = X509_verify_cert(xs_ctx);
 898     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 899         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 900             ERR_clear_error();
 901         i = 1;
 902         rv = 2;
 903     }
 904     if (i > 0)
 905         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 906     if (i <= 0) {
 907         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
 908         i = X509_STORE_CTX_get_error(xs_ctx);
 909         ERR_add_error_data(2, "Verify error:",
 910                            X509_verify_cert_error_string(i));
 911
 912         goto err;
 913     }
 914     /* Remove EE certificate from chain */
 915     x = sk_X509_shift(chain);
 916     X509_free(x);
 917     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 918         if (sk_X509_num(chain) > 0) {
 919             /* See if last cert is self signed */
 920             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 921             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 922                 x = sk_X509_pop(chain);
 923                 X509_free(x);
 924             }
 925         }
 926     }
 927     /*
 928      * Check security level of all CA certificates: EE will have been checked
 929      * already.
 930      */
 931     for (i = 0; i < sk_X509_num(chain); i++) {
 932         x = sk_X509_value(chain, i);
 933         rv = ssl_security_cert(s, ctx, x, 0, 0);
 934         if (rv != 1) {
 935             SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
 936             sk_X509_pop_free(chain, X509_free);
 937             rv = 0;
 938             goto err;
 939         }
 940     }
 941     sk_X509_pop_free(cpk->chain, X509_free);
 942     cpk->chain = chain;
 943     if (rv == 0)
 944         rv = 1;
 945  err:
 946     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 947         X509_STORE_free(chain_store);
 948     X509_STORE_CTX_free(xs_ctx);
 949
 950     return rv;
 951 }
 952
 953 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 954 {
 955     X509_STORE **pstore;
 956     if (chain)
 957         pstore = &c->chain_store;
 958     else
 959         pstore = &c->verify_store;
 960     X509_STORE_free(*pstore);
 961     *pstore = store;
 962     if (ref && store)
 963         X509_STORE_up_ref(store);
 964     return 1;
 965 }
 966
 967 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 968                                          int op, int bits, int nid, void *other,
 969                                          void *ex)
 970 {
 971     int level, minbits;
 972     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 973     if (ctx)
 974         level = SSL_CTX_get_security_level(ctx);
 975     else
 976         level = SSL_get_security_level(s);
 977
 978     if (level <= 0) {
 979         /*
 980          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 981          * anything goes.
 982          */
 983         if (op == SSL_SECOP_TMP_DH && bits < 80)
 984             return 0;
 985         return 1;
 986     }
 987     if (level > 5)
 988         level = 5;
 989     minbits = minbits_table[level - 1];
 990     switch (op) {
 991     case SSL_SECOP_CIPHER_SUPPORTED:
 992     case SSL_SECOP_CIPHER_SHARED:
 993     case SSL_SECOP_CIPHER_CHECK:
 994         {
 995             const SSL_CIPHER *c = other;
 996             /* No ciphers below security level */
 997             if (bits < minbits)
 998                 return 0;
 999             /* No unauthenticated ciphersuites */
1000             if (c->algorithm_auth & SSL_aNULL)
1001                 return 0;
1002             /* No MD5 mac ciphersuites */
1003             if (c->algorithm_mac & SSL_MD5)
1004                 return 0;
1005             /* SHA1 HMAC is 160 bits of security */
1006             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
1007                 return 0;
1008             /* Level 2: no RC4 */
1009             if (level >= 2 && c->algorithm_enc == SSL_RC4)
1010                 return 0;
1011             /* Level 3: forward secure ciphersuites only */
1012             if (level >= 3 && c->min_tls != TLS1_3_VERSION &&
1013                                !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
1014                 return 0;
1015             break;
1016         }
1017     case SSL_SECOP_VERSION:
1018         if (!SSL_IS_DTLS(s)) {
1019             /* SSLv3 not allowed at level 2 */
1020             if (nid <= SSL3_VERSION && level >= 2)
1021                 return 0;
1022             /* TLS v1.1 and above only for level 3 */
1023             if (nid <= TLS1_VERSION && level >= 3)
1024                 return 0;
1025             /* TLS v1.2 only for level 4 and above */
1026             if (nid <= TLS1_1_VERSION && level >= 4)
1027                 return 0;
1028         } else {
1029             /* DTLS v1.2 only for level 4 and above */
1030             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
1031                 return 0;
1032         }
1033         break;
1034
1035     case SSL_SECOP_COMPRESSION:
1036         if (level >= 2)
1037             return 0;
1038         break;
1039     case SSL_SECOP_TICKET:
1040         if (level >= 3)
1041             return 0;
1042         break;
1043     default:
1044         if (bits < minbits)
1045             return 0;
1046     }
1047     return 1;
1048 }
1049
1050 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
1051 {
1052     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
1053 }
1054
1055 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
1056 {
1057     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
1058                              ctx->cert->sec_ex);
1059 }
1060
1061 int ssl_cert_lookup_by_nid(int nid, size_t *pidx)
1062 {
1063     size_t i;
1064
1065     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1066         if (ssl_cert_info[i].nid == nid) {
1067             *pidx = i;
1068             return 1;
1069         }
1070     }
1071
1072     return 0;
1073 }
1074
1075 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
1076 {
1077     size_t i;
1078
1079     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
1080         const SSL_CERT_LOOKUP *tmp_lu = &ssl_cert_info[i];
1081
1082         if (EVP_PKEY_is_a(pk, OBJ_nid2sn(tmp_lu->nid))
1083             || EVP_PKEY_is_a(pk, OBJ_nid2ln(tmp_lu->nid))) {
1084             if (pidx != NULL)
1085                 *pidx = i;
1086             return tmp_lu;
1087         }
1088     }
1089
1090     return NULL;
1091 }
1092
1093 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1094 {
1095     if (idx >= OSSL_NELEM(ssl_cert_info))
1096         return NULL;
1097     return &ssl_cert_info[idx];
1098 }