ssl/ssl_cert.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
   4  *
   5  * Licensed under the OpenSSL license (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include <sys/types.h>
  13
  14 #include "internal/nelem.h"
  15 #ifndef NO_SYS_TYPES_H
  16 # include <sys/types.h>
  17 #endif
  18
  19 #include "internal/o_dir.h"
  20 #include <openssl/lhash.h>
  21 #include <openssl/bio.h>
  22 #include <openssl/pem.h>
  23 #include <openssl/x509v3.h>
  24 #include <openssl/dh.h>
  25 #include <openssl/bn.h>
  26 #include <openssl/crypto.h>
  27 #include "internal/refcount.h"
  28 #include "ssl_locl.h"
  29 #include "ssl_cert_table.h"
  30 #include "internal/thread_once.h"
  31
  32 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
  33                                          int op, int bits, int nid, void *other,
  34                                          void *ex);
  35
  36 static CRYPTO_ONCE ssl_x509_store_ctx_once = CRYPTO_ONCE_STATIC_INIT;
  37 static volatile int ssl_x509_store_ctx_idx = -1;
  38
  39 DEFINE_RUN_ONCE_STATIC(ssl_x509_store_ctx_init)
  40 {
  41     ssl_x509_store_ctx_idx = X509_STORE_CTX_get_ex_new_index(0,
  42                                                              "SSL for verify callback",
  43                                                              NULL, NULL, NULL);
  44     return ssl_x509_store_ctx_idx >= 0;
  45 }
  46
  47 int SSL_get_ex_data_X509_STORE_CTX_idx(void)
  48 {
  49
  50     if (!RUN_ONCE(&ssl_x509_store_ctx_once, ssl_x509_store_ctx_init))
  51         return -1;
  52     return ssl_x509_store_ctx_idx;
  53 }
  54
  55 CERT *ssl_cert_new(void)
  56 {
  57     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  58
  59     if (ret == NULL) {
  60         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  61         return NULL;
  62     }
  63
  64     ret->key = &(ret->pkeys[SSL_PKEY_RSA]);
  65     ret->references = 1;
  66     ret->sec_cb = ssl_security_default_callback;
  67     ret->sec_level = OPENSSL_TLS_SECURITY_LEVEL;
  68     ret->sec_ex = NULL;
  69     ret->lock = CRYPTO_THREAD_lock_new();
  70     if (ret->lock == NULL) {
  71         SSLerr(SSL_F_SSL_CERT_NEW, ERR_R_MALLOC_FAILURE);
  72         OPENSSL_free(ret);
  73         return NULL;
  74     }
  75
  76     return ret;
  77 }
  78
  79 CERT *ssl_cert_dup(CERT *cert)
  80 {
  81     CERT *ret = OPENSSL_zalloc(sizeof(*ret));
  82     int i;
  83
  84     if (ret == NULL) {
  85         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  86         return NULL;
  87     }
  88
  89     ret->references = 1;
  90     ret->key = &ret->pkeys[cert->key - cert->pkeys];
  91     ret->lock = CRYPTO_THREAD_lock_new();
  92     if (ret->lock == NULL) {
  93         SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
  94         OPENSSL_free(ret);
  95         return NULL;
  96     }
  97 #ifndef OPENSSL_NO_DH
  98     if (cert->dh_tmp != NULL) {
  99         ret->dh_tmp = cert->dh_tmp;
 100         EVP_PKEY_up_ref(ret->dh_tmp);
 101     }
 102     ret->dh_tmp_cb = cert->dh_tmp_cb;
 103     ret->dh_tmp_auto = cert->dh_tmp_auto;
 104 #endif
 105
 106     for (i = 0; i < SSL_PKEY_NUM; i++) {
 107         CERT_PKEY *cpk = cert->pkeys + i;
 108         CERT_PKEY *rpk = ret->pkeys + i;
 109         if (cpk->x509 != NULL) {
 110             rpk->x509 = cpk->x509;
 111             X509_up_ref(rpk->x509);
 112         }
 113
 114         if (cpk->privatekey != NULL) {
 115             rpk->privatekey = cpk->privatekey;
 116             EVP_PKEY_up_ref(cpk->privatekey);
 117         }
 118
 119         if (cpk->chain) {
 120             rpk->chain = X509_chain_up_ref(cpk->chain);
 121             if (!rpk->chain) {
 122                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 123                 goto err;
 124             }
 125         }
 126         if (cert->pkeys[i].serverinfo != NULL) {
 127             /* Just copy everything. */
 128             ret->pkeys[i].serverinfo =
 129                 OPENSSL_malloc(cert->pkeys[i].serverinfo_length);
 130             if (ret->pkeys[i].serverinfo == NULL) {
 131                 SSLerr(SSL_F_SSL_CERT_DUP, ERR_R_MALLOC_FAILURE);
 132                 goto err;
 133             }
 134             ret->pkeys[i].serverinfo_length = cert->pkeys[i].serverinfo_length;
 135             memcpy(ret->pkeys[i].serverinfo,
 136                    cert->pkeys[i].serverinfo, cert->pkeys[i].serverinfo_length);
 137         }
 138     }
 139
 140     /* Configured sigalgs copied across */
 141     if (cert->conf_sigalgs) {
 142         ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
 143                                            * sizeof(*cert->conf_sigalgs));
 144         if (ret->conf_sigalgs == NULL)
 145             goto err;
 146         memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
 147                cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
 148         ret->conf_sigalgslen = cert->conf_sigalgslen;
 149     } else
 150         ret->conf_sigalgs = NULL;
 151
 152     if (cert->client_sigalgs) {
 153         ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
 154                                              * sizeof(*cert->client_sigalgs));
 155         if (ret->client_sigalgs == NULL)
 156             goto err;
 157         memcpy(ret->client_sigalgs, cert->client_sigalgs,
 158                cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
 159         ret->client_sigalgslen = cert->client_sigalgslen;
 160     } else
 161         ret->client_sigalgs = NULL;
 162     /* Shared sigalgs also NULL */
 163     ret->shared_sigalgs = NULL;
 164     /* Copy any custom client certificate types */
 165     if (cert->ctype) {
 166         ret->ctype = OPENSSL_memdup(cert->ctype, cert->ctype_len);
 167         if (ret->ctype == NULL)
 168             goto err;
 169         ret->ctype_len = cert->ctype_len;
 170     }
 171
 172     ret->cert_flags = cert->cert_flags;
 173
 174     ret->cert_cb = cert->cert_cb;
 175     ret->cert_cb_arg = cert->cert_cb_arg;
 176
 177     if (cert->verify_store) {
 178         X509_STORE_up_ref(cert->verify_store);
 179         ret->verify_store = cert->verify_store;
 180     }
 181
 182     if (cert->chain_store) {
 183         X509_STORE_up_ref(cert->chain_store);
 184         ret->chain_store = cert->chain_store;
 185     }
 186
 187     ret->sec_cb = cert->sec_cb;
 188     ret->sec_level = cert->sec_level;
 189     ret->sec_ex = cert->sec_ex;
 190
 191     if (!custom_exts_copy(&ret->custext, &cert->custext))
 192         goto err;
 193 #ifndef OPENSSL_NO_PSK
 194     if (cert->psk_identity_hint) {
 195         ret->psk_identity_hint = OPENSSL_strdup(cert->psk_identity_hint);
 196         if (ret->psk_identity_hint == NULL)
 197             goto err;
 198     }
 199 #endif
 200     return ret;
 201
 202  err:
 203     ssl_cert_free(ret);
 204
 205     return NULL;
 206 }
 207
 208 /* Free up and clear all certificates and chains */
 209
 210 void ssl_cert_clear_certs(CERT *c)
 211 {
 212     int i;
 213     if (c == NULL)
 214         return;
 215     for (i = 0; i < SSL_PKEY_NUM; i++) {
 216         CERT_PKEY *cpk = c->pkeys + i;
 217         X509_free(cpk->x509);
 218         cpk->x509 = NULL;
 219         EVP_PKEY_free(cpk->privatekey);
 220         cpk->privatekey = NULL;
 221         sk_X509_pop_free(cpk->chain, X509_free);
 222         cpk->chain = NULL;
 223         OPENSSL_free(cpk->serverinfo);
 224         cpk->serverinfo = NULL;
 225         cpk->serverinfo_length = 0;
 226     }
 227 }
 228
 229 void ssl_cert_free(CERT *c)
 230 {
 231     int i;
 232
 233     if (c == NULL)
 234         return;
 235
 236     CRYPTO_DOWN_REF(&c->references, &i, c->lock);
 237     REF_PRINT_COUNT("CERT", c);
 238     if (i > 0)
 239         return;
 240     REF_ASSERT_ISNT(i < 0);
 241
 242 #ifndef OPENSSL_NO_DH
 243     EVP_PKEY_free(c->dh_tmp);
 244 #endif
 245
 246     ssl_cert_clear_certs(c);
 247     OPENSSL_free(c->conf_sigalgs);
 248     OPENSSL_free(c->client_sigalgs);
 249     OPENSSL_free(c->shared_sigalgs);
 250     OPENSSL_free(c->ctype);
 251     X509_STORE_free(c->verify_store);
 252     X509_STORE_free(c->chain_store);
 253     custom_exts_free(&c->custext);
 254 #ifndef OPENSSL_NO_PSK
 255     OPENSSL_free(c->psk_identity_hint);
 256 #endif
 257     CRYPTO_THREAD_lock_free(c->lock);
 258     OPENSSL_free(c);
 259 }
 260
 261 int ssl_cert_set0_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 262 {
 263     int i, r;
 264     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 265     if (!cpk)
 266         return 0;
 267     for (i = 0; i < sk_X509_num(chain); i++) {
 268         r = ssl_security_cert(s, ctx, sk_X509_value(chain, i), 0, 0);
 269         if (r != 1) {
 270             SSLerr(SSL_F_SSL_CERT_SET0_CHAIN, r);
 271             return 0;
 272         }
 273     }
 274     sk_X509_pop_free(cpk->chain, X509_free);
 275     cpk->chain = chain;
 276     return 1;
 277 }
 278
 279 int ssl_cert_set1_chain(SSL *s, SSL_CTX *ctx, STACK_OF(X509) *chain)
 280 {
 281     STACK_OF(X509) *dchain;
 282     if (!chain)
 283         return ssl_cert_set0_chain(s, ctx, NULL);
 284     dchain = X509_chain_up_ref(chain);
 285     if (!dchain)
 286         return 0;
 287     if (!ssl_cert_set0_chain(s, ctx, dchain)) {
 288         sk_X509_pop_free(dchain, X509_free);
 289         return 0;
 290     }
 291     return 1;
 292 }
 293
 294 int ssl_cert_add0_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 295 {
 296     int r;
 297     CERT_PKEY *cpk = s ? s->cert->key : ctx->cert->key;
 298     if (!cpk)
 299         return 0;
 300     r = ssl_security_cert(s, ctx, x, 0, 0);
 301     if (r != 1) {
 302         SSLerr(SSL_F_SSL_CERT_ADD0_CHAIN_CERT, r);
 303         return 0;
 304     }
 305     if (!cpk->chain)
 306         cpk->chain = sk_X509_new_null();
 307     if (!cpk->chain || !sk_X509_push(cpk->chain, x))
 308         return 0;
 309     return 1;
 310 }
 311
 312 int ssl_cert_add1_chain_cert(SSL *s, SSL_CTX *ctx, X509 *x)
 313 {
 314     if (!ssl_cert_add0_chain_cert(s, ctx, x))
 315         return 0;
 316     X509_up_ref(x);
 317     return 1;
 318 }
 319
 320 int ssl_cert_select_current(CERT *c, X509 *x)
 321 {
 322     int i;
 323     if (x == NULL)
 324         return 0;
 325     for (i = 0; i < SSL_PKEY_NUM; i++) {
 326         CERT_PKEY *cpk = c->pkeys + i;
 327         if (cpk->x509 == x && cpk->privatekey) {
 328             c->key = cpk;
 329             return 1;
 330         }
 331     }
 332
 333     for (i = 0; i < SSL_PKEY_NUM; i++) {
 334         CERT_PKEY *cpk = c->pkeys + i;
 335         if (cpk->privatekey && cpk->x509 && !X509_cmp(cpk->x509, x)) {
 336             c->key = cpk;
 337             return 1;
 338         }
 339     }
 340     return 0;
 341 }
 342
 343 int ssl_cert_set_current(CERT *c, long op)
 344 {
 345     int i, idx;
 346     if (!c)
 347         return 0;
 348     if (op == SSL_CERT_SET_FIRST)
 349         idx = 0;
 350     else if (op == SSL_CERT_SET_NEXT) {
 351         idx = (int)(c->key - c->pkeys + 1);
 352         if (idx >= SSL_PKEY_NUM)
 353             return 0;
 354     } else
 355         return 0;
 356     for (i = idx; i < SSL_PKEY_NUM; i++) {
 357         CERT_PKEY *cpk = c->pkeys + i;
 358         if (cpk->x509 && cpk->privatekey) {
 359             c->key = cpk;
 360             return 1;
 361         }
 362     }
 363     return 0;
 364 }
 365
 366 void ssl_cert_set_cert_cb(CERT *c, int (*cb) (SSL *ssl, void *arg), void *arg)
 367 {
 368     c->cert_cb = cb;
 369     c->cert_cb_arg = arg;
 370 }
 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();
 389     if (ctx == NULL) {
 390         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, 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         SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, 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
 438     s->verify_result = X509_STORE_CTX_get_error(ctx);
 439     sk_X509_pop_free(s->verified_chain, X509_free);
 440     s->verified_chain = NULL;
 441     if (X509_STORE_CTX_get0_chain(ctx) != NULL) {
 442         s->verified_chain = X509_STORE_CTX_get1_chain(ctx);
 443         if (s->verified_chain == NULL) {
 444             SSLerr(SSL_F_SSL_VERIFY_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 445             i = 0;
 446         }
 447     }
 448
 449     /* Move peername from the store context params to the SSL handle's */
 450     X509_VERIFY_PARAM_move_peername(s->param, param);
 451
 452  end:
 453     X509_STORE_CTX_free(ctx);
 454     return i;
 455 }
 456
 457 static void set0_CA_list(STACK_OF(X509_NAME) **ca_list,
 458                         STACK_OF(X509_NAME) *name_list)
 459 {
 460     sk_X509_NAME_pop_free(*ca_list, X509_NAME_free);
 461     *ca_list = name_list;
 462 }
 463
 464 STACK_OF(X509_NAME) *SSL_dup_CA_list(const STACK_OF(X509_NAME) *sk)
 465 {
 466     int i;
 467     STACK_OF(X509_NAME) *ret;
 468     X509_NAME *name;
 469
 470     ret = sk_X509_NAME_new_null();
 471     if (ret == NULL) {
 472         SSLerr(SSL_F_SSL_DUP_CA_LIST, ERR_R_MALLOC_FAILURE);
 473         return NULL;
 474     }
 475     for (i = 0; i < sk_X509_NAME_num(sk); i++) {
 476         name = X509_NAME_dup(sk_X509_NAME_value(sk, i));
 477         if (name == NULL || !sk_X509_NAME_push(ret, name)) {
 478             sk_X509_NAME_pop_free(ret, X509_NAME_free);
 479             X509_NAME_free(name);
 480             return NULL;
 481         }
 482     }
 483     return (ret);
 484 }
 485
 486 void SSL_set0_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 487 {
 488     set0_CA_list(&s->ca_names, name_list);
 489 }
 490
 491 void SSL_CTX_set0_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 492 {
 493     set0_CA_list(&ctx->ca_names, name_list);
 494 }
 495
 496 const STACK_OF(X509_NAME) *SSL_CTX_get0_CA_list(const SSL_CTX *ctx)
 497 {
 498     return ctx->ca_names;
 499 }
 500
 501 const STACK_OF(X509_NAME) *SSL_get0_CA_list(const SSL *s)
 502 {
 503     return s->ca_names != NULL ? s->ca_names : s->ctx->ca_names;
 504 }
 505
 506 void SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK_OF(X509_NAME) *name_list)
 507 {
 508     SSL_CTX_set0_CA_list(ctx, name_list);
 509 }
 510
 511 STACK_OF(X509_NAME) *SSL_CTX_get_client_CA_list(const SSL_CTX *ctx)
 512 {
 513     return ctx->ca_names;
 514 }
 515
 516 void SSL_set_client_CA_list(SSL *s, STACK_OF(X509_NAME) *name_list)
 517 {
 518     SSL_set0_CA_list(s, name_list);
 519 }
 520
 521 const STACK_OF(X509_NAME) *SSL_get0_peer_CA_list(const SSL *s)
 522 {
 523     return s->s3 != NULL ? s->s3->tmp.peer_ca_names : NULL;
 524 }
 525
 526 STACK_OF(X509_NAME) *SSL_get_client_CA_list(const SSL *s)
 527 {
 528     if (!s->server)
 529         return s->s3 != NULL ?  s->s3->tmp.peer_ca_names : NULL;
 530     return s->ca_names != NULL ?  s->ca_names : s->ctx->ca_names;
 531 }
 532
 533 static int add_ca_name(STACK_OF(X509_NAME) **sk, const X509 *x)
 534 {
 535     X509_NAME *name;
 536
 537     if (x == NULL)
 538         return 0;
 539     if (*sk == NULL && ((*sk = sk_X509_NAME_new_null()) == NULL))
 540         return 0;
 541
 542     if ((name = X509_NAME_dup(X509_get_subject_name(x))) == NULL)
 543         return 0;
 544
 545     if (!sk_X509_NAME_push(*sk, name)) {
 546         X509_NAME_free(name);
 547         return 0;
 548     }
 549     return 1;
 550 }
 551
 552 int SSL_add1_CA_list(SSL *ssl, const X509 *x)
 553 {
 554     return add_ca_name(&ssl->ca_names, x);
 555 }
 556
 557 int SSL_CTX_add1_CA_list(SSL_CTX *ctx, const X509 *x)
 558 {
 559     return add_ca_name(&ctx->ca_names, x);
 560 }
 561
 562 int SSL_add_client_CA(SSL *ssl, X509 *x)
 563 {
 564     return add_ca_name(&ssl->ca_names, x);
 565 }
 566
 567 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x)
 568 {
 569     return add_ca_name(&ctx->ca_names, x);
 570 }
 571
 572 static int xname_sk_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
 573 {
 574     return (X509_NAME_cmp(*a, *b));
 575 }
 576
 577 static int xname_cmp(const X509_NAME *a, const X509_NAME *b)
 578 {
 579     return X509_NAME_cmp(a, b);
 580 }
 581
 582 static unsigned long xname_hash(const X509_NAME *a)
 583 {
 584     return X509_NAME_hash((X509_NAME *)a);
 585 }
 586
 587 /**
 588  * Load CA certs from a file into a ::STACK. Note that it is somewhat misnamed;
 589  * it doesn't really have anything to do with clients (except that a common use
 590  * for a stack of CAs is to send it to the client). Actually, it doesn't have
 591  * much to do with CAs, either, since it will load any old cert.
 592  * \param file the file containing one or more certs.
 593  * \return a ::STACK containing the certs.
 594  */
 595 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file)
 596 {
 597     BIO *in = BIO_new(BIO_s_file());
 598     X509 *x = NULL;
 599     X509_NAME *xn = NULL;
 600     STACK_OF(X509_NAME) *ret = NULL;
 601     LHASH_OF(X509_NAME) *name_hash = lh_X509_NAME_new(xname_hash, xname_cmp);
 602
 603     if ((name_hash == NULL) || (in == NULL)) {
 604         SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 605         goto err;
 606     }
 607
 608     if (!BIO_read_filename(in, file))
 609         goto err;
 610
 611     for (;;) {
 612         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 613             break;
 614         if (ret == NULL) {
 615             ret = sk_X509_NAME_new_null();
 616             if (ret == NULL) {
 617                 SSLerr(SSL_F_SSL_LOAD_CLIENT_CA_FILE, ERR_R_MALLOC_FAILURE);
 618                 goto err;
 619             }
 620         }
 621         if ((xn = X509_get_subject_name(x)) == NULL)
 622             goto err;
 623         /* check for duplicates */
 624         xn = X509_NAME_dup(xn);
 625         if (xn == NULL)
 626             goto err;
 627         if (lh_X509_NAME_retrieve(name_hash, xn) != NULL) {
 628             /* Duplicate. */
 629             X509_NAME_free(xn);
 630             xn = NULL;
 631         } else {
 632             lh_X509_NAME_insert(name_hash, xn);
 633             if (!sk_X509_NAME_push(ret, xn))
 634                 goto err;
 635         }
 636     }
 637     goto done;
 638
 639  err:
 640     X509_NAME_free(xn);
 641     sk_X509_NAME_pop_free(ret, X509_NAME_free);
 642     ret = NULL;
 643  done:
 644     BIO_free(in);
 645     X509_free(x);
 646     lh_X509_NAME_free(name_hash);
 647     if (ret != NULL)
 648         ERR_clear_error();
 649     return (ret);
 650 }
 651
 652 /**
 653  * Add a file of certs to a stack.
 654  * \param stack the stack to add to.
 655  * \param file the file to add from. All certs in this file that are not
 656  * already in the stack will be added.
 657  * \return 1 for success, 0 for failure. Note that in the case of failure some
 658  * certs may have been added to \c stack.
 659  */
 660
 661 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 662                                         const char *file)
 663 {
 664     BIO *in;
 665     X509 *x = NULL;
 666     X509_NAME *xn = NULL;
 667     int ret = 1;
 668     int (*oldcmp) (const X509_NAME *const *a, const X509_NAME *const *b);
 669
 670     oldcmp = sk_X509_NAME_set_cmp_func(stack, xname_sk_cmp);
 671
 672     in = BIO_new(BIO_s_file());
 673
 674     if (in == NULL) {
 675         SSLerr(SSL_F_SSL_ADD_FILE_CERT_SUBJECTS_TO_STACK, ERR_R_MALLOC_FAILURE);
 676         goto err;
 677     }
 678
 679     if (!BIO_read_filename(in, file))
 680         goto err;
 681
 682     for (;;) {
 683         if (PEM_read_bio_X509(in, &x, NULL, NULL) == NULL)
 684             break;
 685         if ((xn = X509_get_subject_name(x)) == NULL)
 686             goto err;
 687         xn = X509_NAME_dup(xn);
 688         if (xn == NULL)
 689             goto err;
 690         if (sk_X509_NAME_find(stack, xn) >= 0) {
 691             /* Duplicate. */
 692             X509_NAME_free(xn);
 693         } else if (!sk_X509_NAME_push(stack, xn)) {
 694             X509_NAME_free(xn);
 695             goto err;
 696         }
 697     }
 698
 699     ERR_clear_error();
 700     goto done;
 701
 702  err:
 703     ret = 0;
 704  done:
 705     BIO_free(in);
 706     X509_free(x);
 707     (void)sk_X509_NAME_set_cmp_func(stack, oldcmp);
 708     return ret;
 709 }
 710
 711 /**
 712  * Add a directory of certs to a stack.
 713  * \param stack the stack to append to.
 714  * \param dir the directory to append from. All files in this directory will be
 715  * examined as potential certs. Any that are acceptable to
 716  * SSL_add_dir_cert_subjects_to_stack() that are not already in the stack will be
 717  * included.
 718  * \return 1 for success, 0 for failure. Note that in the case of failure some
 719  * certs may have been added to \c stack.
 720  */
 721
 722 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
 723                                        const char *dir)
 724 {
 725     OPENSSL_DIR_CTX *d = NULL;
 726     const char *filename;
 727     int ret = 0;
 728
 729     /* Note that a side effect is that the CAs will be sorted by name */
 730
 731     while ((filename = OPENSSL_DIR_read(&d, dir))) {
 732         char buf[1024];
 733         int r;
 734
 735         if (strlen(dir) + strlen(filename) + 2 > sizeof buf) {
 736             SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK,
 737                    SSL_R_PATH_TOO_LONG);
 738             goto err;
 739         }
 740 #ifdef OPENSSL_SYS_VMS
 741         r = BIO_snprintf(buf, sizeof buf, "%s%s", dir, filename);
 742 #else
 743         r = BIO_snprintf(buf, sizeof buf, "%s/%s", dir, filename);
 744 #endif
 745         if (r <= 0 || r >= (int)sizeof(buf))
 746             goto err;
 747         if (!SSL_add_file_cert_subjects_to_stack(stack, buf))
 748             goto err;
 749     }
 750
 751     if (errno) {
 752         SYSerr(SYS_F_OPENDIR, get_last_sys_error());
 753         ERR_add_error_data(3, "OPENSSL_DIR_read(&ctx, '", dir, "')");
 754         SSLerr(SSL_F_SSL_ADD_DIR_CERT_SUBJECTS_TO_STACK, ERR_R_SYS_LIB);
 755         goto err;
 756     }
 757
 758     ret = 1;
 759
 760  err:
 761     if (d)
 762         OPENSSL_DIR_end(&d);
 763
 764     return ret;
 765 }
 766
 767 /* Build a certificate chain for current certificate */
 768 int ssl_build_cert_chain(SSL *s, SSL_CTX *ctx, int flags)
 769 {
 770     CERT *c = s ? s->cert : ctx->cert;
 771     CERT_PKEY *cpk = c->key;
 772     X509_STORE *chain_store = NULL;
 773     X509_STORE_CTX *xs_ctx = NULL;
 774     STACK_OF(X509) *chain = NULL, *untrusted = NULL;
 775     X509 *x;
 776     int i, rv = 0;
 777
 778     if (!cpk->x509) {
 779         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_NO_CERTIFICATE_SET);
 780         goto err;
 781     }
 782     /* Rearranging and check the chain: add everything to a store */
 783     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK) {
 784         chain_store = X509_STORE_new();
 785         if (chain_store == NULL)
 786             goto err;
 787         for (i = 0; i < sk_X509_num(cpk->chain); i++) {
 788             x = sk_X509_value(cpk->chain, i);
 789             if (!X509_STORE_add_cert(chain_store, x))
 790                 goto err;
 791         }
 792         /* Add EE cert too: it might be self signed */
 793         if (!X509_STORE_add_cert(chain_store, cpk->x509))
 794             goto err;
 795     } else {
 796         if (c->chain_store)
 797             chain_store = c->chain_store;
 798         else if (s)
 799             chain_store = s->ctx->cert_store;
 800         else
 801             chain_store = ctx->cert_store;
 802
 803         if (flags & SSL_BUILD_CHAIN_FLAG_UNTRUSTED)
 804             untrusted = cpk->chain;
 805     }
 806
 807     xs_ctx = X509_STORE_CTX_new();
 808     if (xs_ctx == NULL) {
 809         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_MALLOC_FAILURE);
 810         goto err;
 811     }
 812     if (!X509_STORE_CTX_init(xs_ctx, chain_store, cpk->x509, untrusted)) {
 813         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, ERR_R_X509_LIB);
 814         goto err;
 815     }
 816     /* Set suite B flags if needed */
 817     X509_STORE_CTX_set_flags(xs_ctx,
 818                              c->cert_flags & SSL_CERT_FLAG_SUITEB_128_LOS);
 819
 820     i = X509_verify_cert(xs_ctx);
 821     if (i <= 0 && flags & SSL_BUILD_CHAIN_FLAG_IGNORE_ERROR) {
 822         if (flags & SSL_BUILD_CHAIN_FLAG_CLEAR_ERROR)
 823             ERR_clear_error();
 824         i = 1;
 825         rv = 2;
 826     }
 827     if (i > 0)
 828         chain = X509_STORE_CTX_get1_chain(xs_ctx);
 829     if (i <= 0) {
 830         SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, SSL_R_CERTIFICATE_VERIFY_FAILED);
 831         i = X509_STORE_CTX_get_error(xs_ctx);
 832         ERR_add_error_data(2, "Verify error:",
 833                            X509_verify_cert_error_string(i));
 834
 835         goto err;
 836     }
 837     /* Remove EE certificate from chain */
 838     x = sk_X509_shift(chain);
 839     X509_free(x);
 840     if (flags & SSL_BUILD_CHAIN_FLAG_NO_ROOT) {
 841         if (sk_X509_num(chain) > 0) {
 842             /* See if last cert is self signed */
 843             x = sk_X509_value(chain, sk_X509_num(chain) - 1);
 844             if (X509_get_extension_flags(x) & EXFLAG_SS) {
 845                 x = sk_X509_pop(chain);
 846                 X509_free(x);
 847             }
 848         }
 849     }
 850     /*
 851      * Check security level of all CA certificates: EE will have been checked
 852      * already.
 853      */
 854     for (i = 0; i < sk_X509_num(chain); i++) {
 855         x = sk_X509_value(chain, i);
 856         rv = ssl_security_cert(s, ctx, x, 0, 0);
 857         if (rv != 1) {
 858             SSLerr(SSL_F_SSL_BUILD_CERT_CHAIN, rv);
 859             sk_X509_pop_free(chain, X509_free);
 860             rv = 0;
 861             goto err;
 862         }
 863     }
 864     sk_X509_pop_free(cpk->chain, X509_free);
 865     cpk->chain = chain;
 866     if (rv == 0)
 867         rv = 1;
 868  err:
 869     if (flags & SSL_BUILD_CHAIN_FLAG_CHECK)
 870         X509_STORE_free(chain_store);
 871     X509_STORE_CTX_free(xs_ctx);
 872
 873     return rv;
 874 }
 875
 876 int ssl_cert_set_cert_store(CERT *c, X509_STORE *store, int chain, int ref)
 877 {
 878     X509_STORE **pstore;
 879     if (chain)
 880         pstore = &c->chain_store;
 881     else
 882         pstore = &c->verify_store;
 883     X509_STORE_free(*pstore);
 884     *pstore = store;
 885     if (ref && store)
 886         X509_STORE_up_ref(store);
 887     return 1;
 888 }
 889
 890 static int ssl_security_default_callback(const SSL *s, const SSL_CTX *ctx,
 891                                          int op, int bits, int nid, void *other,
 892                                          void *ex)
 893 {
 894     int level, minbits;
 895     static const int minbits_table[5] = { 80, 112, 128, 192, 256 };
 896     if (ctx)
 897         level = SSL_CTX_get_security_level(ctx);
 898     else
 899         level = SSL_get_security_level(s);
 900
 901     if (level <= 0) {
 902         /*
 903          * No EDH keys weaker than 1024-bits even at level 0, otherwise,
 904          * anything goes.
 905          */
 906         if (op == SSL_SECOP_TMP_DH && bits < 80)
 907             return 0;
 908         return 1;
 909     }
 910     if (level > 5)
 911         level = 5;
 912     minbits = minbits_table[level - 1];
 913     switch (op) {
 914     case SSL_SECOP_CIPHER_SUPPORTED:
 915     case SSL_SECOP_CIPHER_SHARED:
 916     case SSL_SECOP_CIPHER_CHECK:
 917         {
 918             const SSL_CIPHER *c = other;
 919             /* No ciphers below security level */
 920             if (bits < minbits)
 921                 return 0;
 922             /* No unauthenticated ciphersuites */
 923             if (c->algorithm_auth & SSL_aNULL)
 924                 return 0;
 925             /* No MD5 mac ciphersuites */
 926             if (c->algorithm_mac & SSL_MD5)
 927                 return 0;
 928             /* SHA1 HMAC is 160 bits of security */
 929             if (minbits > 160 && c->algorithm_mac & SSL_SHA1)
 930                 return 0;
 931             /* Level 2: no RC4 */
 932             if (level >= 2 && c->algorithm_enc == SSL_RC4)
 933                 return 0;
 934             /* Level 3: forward secure ciphersuites only */
 935             if (level >= 3 && !(c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)))
 936                 return 0;
 937             break;
 938         }
 939     case SSL_SECOP_VERSION:
 940         if (!SSL_IS_DTLS(s)) {
 941             /* SSLv3 not allowed at level 2 */
 942             if (nid <= SSL3_VERSION && level >= 2)
 943                 return 0;
 944             /* TLS v1.1 and above only for level 3 */
 945             if (nid <= TLS1_VERSION && level >= 3)
 946                 return 0;
 947             /* TLS v1.2 only for level 4 and above */
 948             if (nid <= TLS1_1_VERSION && level >= 4)
 949                 return 0;
 950         } else {
 951             /* DTLS v1.2 only for level 4 and above */
 952             if (DTLS_VERSION_LT(nid, DTLS1_2_VERSION) && level >= 4)
 953                 return 0;
 954         }
 955         break;
 956
 957     case SSL_SECOP_COMPRESSION:
 958         if (level >= 2)
 959             return 0;
 960         break;
 961     case SSL_SECOP_TICKET:
 962         if (level >= 3)
 963             return 0;
 964         break;
 965     default:
 966         if (bits < minbits)
 967             return 0;
 968     }
 969     return 1;
 970 }
 971
 972 int ssl_security(const SSL *s, int op, int bits, int nid, void *other)
 973 {
 974     return s->cert->sec_cb(s, NULL, op, bits, nid, other, s->cert->sec_ex);
 975 }
 976
 977 int ssl_ctx_security(const SSL_CTX *ctx, int op, int bits, int nid, void *other)
 978 {
 979     return ctx->cert->sec_cb(NULL, ctx, op, bits, nid, other,
 980                              ctx->cert->sec_ex);
 981 }
 982
 983 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_pkey(const EVP_PKEY *pk, size_t *pidx)
 984 {
 985     int nid = EVP_PKEY_id(pk);
 986     size_t i;
 987
 988     if (nid == NID_undef)
 989         return NULL;
 990
 991     for (i = 0; i < OSSL_NELEM(ssl_cert_info); i++) {
 992         if (ssl_cert_info[i].nid == nid) {
 993             if (pidx != NULL)
 994                 *pidx = i;
 995             return &ssl_cert_info[i];
 996         }
 997     }
 998     return NULL;
 999 }
1000
1001 const SSL_CERT_LOOKUP *ssl_cert_lookup_by_idx(size_t idx)
1002 {
1003     if (idx >= OSSL_NELEM(ssl_cert_info))
1004         return 0;
1005     return &ssl_cert_info[idx];
1006 }