src/ssl/support.cc

   1
   2 /*
   3  * $Id$
   4  *
   5  * AUTHOR: Benno Rice
   6  * DEBUG: section 83    SSL accelerator support
   7  *
   8  * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from the
  12  *  Internet community.  Development is led by Duane Wessels of the
  13  *  National Laboratory for Applied Network Research and funded by the
  14  *  National Science Foundation.  Squid is Copyrighted (C) 1998 by
  15  *  Duane Wessels and the University of California San Diego.  Please
  16  *  see the COPYRIGHT file for full details.  Squid incorporates
  17  *  software developed and/or copyrighted by other sources.  Please see
  18  *  the CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include "squid.h"
  37
  38 /* MS Visual Studio Projects are monolithic, so we need the following
  39  * #if to exclude the SSL code from compile process when not needed.
  40  */
  41 #if USE_SSL
  42
  43 #include "fde.h"
  44 #include "acl/FilledChecklist.h"
  45 #include "ssl/ErrorDetail.h"
  46 #include "ssl/support.h"
  47 #include "ssl/gadgets.h"
  48
  49 /**
  50  \defgroup ServerProtocolSSLInternal Server-Side SSL Internals
  51  \ingroup ServerProtocolSSLAPI
  52  */
  53
  54 /// \ingroup ServerProtocolSSLInternal
  55 static int
  56 ssl_ask_password_cb(char *buf, int size, int rwflag, void *userdata)
  57 {
  58     FILE *in;
  59     int len = 0;
  60     char cmdline[1024];
  61
  62     snprintf(cmdline, sizeof(cmdline), "\"%s\" \"%s\"", Config.Program.ssl_password, (const char *)userdata);
  63     in = popen(cmdline, "r");
  64
  65     if (fgets(buf, size, in))
  66
  67         len = strlen(buf);
  68
  69     while (len > 0 && (buf[len - 1] == '\n' || buf[len - 1] == '\r'))
  70
  71         len--;
  72
  73     buf[len] = '\0';
  74
  75     pclose(in);
  76
  77     return len;
  78 }
  79
  80 /// \ingroup ServerProtocolSSLInternal
  81 static void
  82 ssl_ask_password(SSL_CTX * context, const char * prompt)
  83 {
  84     if (Config.Program.ssl_password) {
  85         SSL_CTX_set_default_passwd_cb(context, ssl_ask_password_cb);
  86         SSL_CTX_set_default_passwd_cb_userdata(context, (void *)prompt);
  87     }
  88 }
  89
  90 /// \ingroup ServerProtocolSSLInternal
  91 static RSA *
  92 ssl_temp_rsa_cb(SSL * ssl, int anInt, int keylen)
  93 {
  94     static RSA *rsa_512 = NULL;
  95     static RSA *rsa_1024 = NULL;
  96     RSA *rsa = NULL;
  97     int newkey = 0;
  98
  99     switch (keylen) {
 100
 101     case 512:
 102
 103         if (!rsa_512) {
 104             rsa_512 = RSA_generate_key(512, RSA_F4, NULL, NULL);
 105             newkey = 1;
 106         }
 107
 108         rsa = rsa_512;
 109         break;
 110
 111     case 1024:
 112
 113         if (!rsa_1024) {
 114             rsa_1024 = RSA_generate_key(1024, RSA_F4, NULL, NULL);
 115             newkey = 1;
 116         }
 117
 118         rsa = rsa_1024;
 119         break;
 120
 121     default:
 122         debugs(83, 1, "ssl_temp_rsa_cb: Unexpected key length " << keylen);
 123         return NULL;
 124     }
 125
 126     if (rsa == NULL) {
 127         debugs(83, 1, "ssl_temp_rsa_cb: Failed to generate key " << keylen);
 128         return NULL;
 129     }
 130
 131     if (newkey) {
 132         if (do_debug(83, 5))
 133             PEM_write_RSAPrivateKey(debug_log, rsa, NULL, NULL, 0, NULL, NULL);
 134
 135         debugs(83, 1, "Generated ephemeral RSA key of length " << keylen);
 136     }
 137
 138     return rsa;
 139 }
 140
 141 int Ssl::asn1timeToString(ASN1_TIME *tm, char *buf, int len)
 142 {
 143     BIO *bio;
 144     int write = 0;
 145     bio = BIO_new(BIO_s_mem());
 146     if (bio) {
 147         if (ASN1_TIME_print(bio, tm))
 148             write = BIO_read(bio, buf, len-1);
 149         BIO_free(bio);
 150     }
 151     buf[write]='\0';
 152     return write;
 153 }
 154
 155 int Ssl::matchX509CommonNames(X509 *peer_cert, void *check_data, int (*check_func)(void *check_data,  ASN1_STRING *cn_data))
 156 {
 157     assert(peer_cert);
 158
 159     X509_NAME *name = X509_get_subject_name(peer_cert);
 160
 161     for (int i = X509_NAME_get_index_by_NID(name, NID_commonName, -1); i >= 0; i = X509_NAME_get_index_by_NID(name, NID_commonName, i)) {
 162
 163         ASN1_STRING *cn_data = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, i));
 164
 165         if ( (*check_func)(check_data, cn_data) == 0)
 166             return 1;
 167     }
 168
 169     STACK_OF(GENERAL_NAME) * altnames;
 170     altnames = (STACK_OF(GENERAL_NAME)*)X509_get_ext_d2i(peer_cert, NID_subject_alt_name, NULL, NULL);
 171
 172     if (altnames) {
 173         int numalts = sk_GENERAL_NAME_num(altnames);
 174         for (int i = 0; i < numalts; i++) {
 175             const GENERAL_NAME *check = sk_GENERAL_NAME_value(altnames, i);
 176             if (check->type != GEN_DNS) {
 177                 continue;
 178             }
 179             ASN1_STRING *cn_data = check->d.dNSName;
 180
 181             if ( (*check_func)(check_data, cn_data) == 0)
 182                 return 1;
 183         }
 184         sk_GENERAL_NAME_pop_free(altnames, GENERAL_NAME_free);
 185     }
 186     return 0;
 187 }
 188
 189 static int check_domain( void *check_data, ASN1_STRING *cn_data)
 190 {
 191     char cn[1024];
 192     const char *server = (const char *)check_data;
 193
 194     if (cn_data->length > (int)sizeof(cn) - 1) {
 195         return 1; //if does not fit our buffer just ignore
 196     }
 197     memcpy(cn, cn_data->data, cn_data->length);
 198     cn[cn_data->length] = '\0';
 199     debugs(83, 4, "Verifying server domain " << server << " to certificate name/subjectAltName " << cn);
 200     return matchDomainName(server, cn[0] == '*' ? cn + 1 : cn);
 201 }
 202
 203 bool Ssl::checkX509ServerValidity(X509 *cert, const char *server)
 204 {
 205     return matchX509CommonNames(cert, (void *)server, check_domain);
 206 }
 207
 208 /// \ingroup ServerProtocolSSLInternal
 209 static int
 210 ssl_verify_cb(int ok, X509_STORE_CTX * ctx)
 211 {
 212     // preserve original ctx->error before SSL_ calls can overwrite it
 213     Ssl::ssl_error_t error_no = ok ? SSL_ERROR_NONE : ctx->error;
 214
 215     char buffer[256] = "";
 216     SSL *ssl = (SSL *)X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
 217     SSL_CTX *sslctx = SSL_get_SSL_CTX(ssl);
 218     const char *server = (const char *)SSL_get_ex_data(ssl, ssl_ex_index_server);
 219     void *dont_verify_domain = SSL_CTX_get_ex_data(sslctx, ssl_ctx_ex_index_dont_verify_domain);
 220     ACLChecklist *check = (ACLChecklist*)SSL_get_ex_data(ssl, ssl_ex_index_cert_error_check);
 221     X509 *peeked_cert = (X509 *)SSL_get_ex_data(ssl, ssl_ex_index_ssl_peeked_cert);
 222     X509 *peer_cert = ctx->cert;
 223
 224     X509_NAME_oneline(X509_get_subject_name(peer_cert), buffer,
 225                       sizeof(buffer));
 226
 227     if (ok) {
 228         debugs(83, 5, "SSL Certificate signature OK: " << buffer);
 229
 230         if (server) {
 231             if (!Ssl::checkX509ServerValidity(peer_cert, server)) {
 232                 debugs(83, 2, "SQUID_X509_V_ERR_DOMAIN_MISMATCH: Certificate " << buffer << " does not match domainname " << server);
 233                 ok = 0;
 234                 error_no = SQUID_X509_V_ERR_DOMAIN_MISMATCH;
 235             }
 236         }
 237     }
 238
 239     if (ok && peeked_cert) {
 240         /*Check if the already peeked certificate match the new one*/
 241         if (X509_cmp(peer_cert, peeked_cert) != 0) {
 242             debugs(83, 2, "SQUID_X509_V_ERR_CERT_CHANGE: Certificate " << buffer << " does not match peeked certificate");
 243             ok = 0;
 244             error_no =  SQUID_X509_V_ERR_CERT_CHANGE;
 245         }
 246     }
 247
 248     if (!ok) {
 249         Ssl::Errors *errNoList = static_cast<Ssl::Errors *>(SSL_get_ex_data(ssl, ssl_ex_index_ssl_error_sslerrno));
 250         if (!errNoList) {
 251             errNoList = new Ssl::Errors;
 252             if (!SSL_set_ex_data(ssl, ssl_ex_index_ssl_error_sslerrno,  (void *)errNoList)) {
 253                 debugs(83, 2, "Failed to set ssl error_no in ssl_verify_cb: Certificate " << buffer);
 254                 delete errNoList;
 255                 errNoList = NULL;
 256             }
 257         }
 258
 259         if (errNoList) // Append the err no to the SSL errors lists.
 260             errNoList->push_back(error_no);
 261
 262         if (const char *err_descr = Ssl::GetErrorDescr(error_no))
 263             debugs(83, 5, err_descr << ": " << buffer);
 264         else
 265             debugs(83, DBG_IMPORTANT, "SSL unknown certificate error " << error_no << " in " << buffer);
 266
 267         if (check) {
 268             ACLFilledChecklist *filledCheck = Filled(check);
 269             filledCheck->sslErrorList.clear();
 270             filledCheck->sslErrorList.push_back(error_no);
 271             if (check->fastCheck() == ACCESS_ALLOWED) {
 272                 debugs(83, 3, "bypassing SSL error " << error_no << " in " << buffer);
 273                 ok = 1;
 274             } else {
 275                 debugs(83, 5, "confirming SSL error " << error_no);
 276             }
 277         }
 278     }
 279
 280     if (!dont_verify_domain && server) {}
 281
 282     if (!ok && !SSL_get_ex_data(ssl, ssl_ex_index_ssl_error_detail) ) {
 283
 284         // Find the broken certificate. It may be intermediate.
 285         X509 *broken_cert = peer_cert; // reasonable default if search fails
 286         // Our SQUID_X509_V_ERR_DOMAIN_MISMATCH implies peer_cert is at fault.
 287         if (error_no != SQUID_X509_V_ERR_DOMAIN_MISMATCH) {
 288             if (X509 *last_used_cert = X509_STORE_CTX_get_current_cert(ctx))
 289                 broken_cert = last_used_cert;
 290         }
 291
 292         Ssl::ErrorDetail *errDetail =
 293             new Ssl::ErrorDetail(error_no, broken_cert);
 294
 295         if (!SSL_set_ex_data(ssl, ssl_ex_index_ssl_error_detail,  errDetail)) {
 296             debugs(83, 2, "Failed to set Ssl::ErrorDetail in ssl_verify_cb: Certificate " << buffer);
 297             delete errDetail;
 298         }
 299     }
 300
 301     return ok;
 302 }
 303
 304 /// \ingroup ServerProtocolSSLInternal
 305 static struct ssl_option {
 306     const char *name;
 307     long value;
 308 }
 309
 310 ssl_options[] = {
 311
 312 #if SSL_OP_MICROSOFT_SESS_ID_BUG
 313     {
 314         "MICROSOFT_SESS_ID_BUG", SSL_OP_MICROSOFT_SESS_ID_BUG
 315     },
 316 #endif
 317 #if SSL_OP_NETSCAPE_CHALLENGE_BUG
 318     {
 319         "NETSCAPE_CHALLENGE_BUG", SSL_OP_NETSCAPE_CHALLENGE_BUG
 320     },
 321 #endif
 322 #if SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 323     {
 324         "NETSCAPE_REUSE_CIPHER_CHANGE_BUG", SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
 325     },
 326 #endif
 327 #if SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
 328     {
 329         "SSLREF2_REUSE_CERT_TYPE_BUG", SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
 330     },
 331 #endif
 332 #if SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
 333     {
 334         "MICROSOFT_BIG_SSLV3_BUFFER", SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
 335     },
 336 #endif
 337 #if SSL_OP_MSIE_SSLV2_RSA_PADDING
 338     {
 339         "MSIE_SSLV2_RSA_PADDING", SSL_OP_MSIE_SSLV2_RSA_PADDING
 340     },
 341 #endif
 342 #if SSL_OP_SSLEAY_080_CLIENT_DH_BUG
 343     {
 344         "SSLEAY_080_CLIENT_DH_BUG", SSL_OP_SSLEAY_080_CLIENT_DH_BUG
 345     },
 346 #endif
 347 #if SSL_OP_TLS_D5_BUG
 348     {
 349         "TLS_D5_BUG", SSL_OP_TLS_D5_BUG
 350     },
 351 #endif
 352 #if SSL_OP_TLS_BLOCK_PADDING_BUG
 353     {
 354         "TLS_BLOCK_PADDING_BUG", SSL_OP_TLS_BLOCK_PADDING_BUG
 355     },
 356 #endif
 357 #if SSL_OP_TLS_ROLLBACK_BUG
 358     {
 359         "TLS_ROLLBACK_BUG", SSL_OP_TLS_ROLLBACK_BUG
 360     },
 361 #endif
 362 #if SSL_OP_ALL
 363     {
 364         "ALL", SSL_OP_ALL
 365     },
 366 #endif
 367 #if SSL_OP_SINGLE_DH_USE
 368     {
 369         "SINGLE_DH_USE", SSL_OP_SINGLE_DH_USE
 370     },
 371 #endif
 372 #if SSL_OP_EPHEMERAL_RSA
 373     {
 374         "EPHEMERAL_RSA", SSL_OP_EPHEMERAL_RSA
 375     },
 376 #endif
 377 #if SSL_OP_PKCS1_CHECK_1
 378     {
 379         "PKCS1_CHECK_1", SSL_OP_PKCS1_CHECK_1
 380     },
 381 #endif
 382 #if SSL_OP_PKCS1_CHECK_2
 383     {
 384         "PKCS1_CHECK_2", SSL_OP_PKCS1_CHECK_2
 385     },
 386 #endif
 387 #if SSL_OP_NETSCAPE_CA_DN_BUG
 388     {
 389         "NETSCAPE_CA_DN_BUG", SSL_OP_NETSCAPE_CA_DN_BUG
 390     },
 391 #endif
 392 #if SSL_OP_NON_EXPORT_FIRST
 393     {
 394         "NON_EXPORT_FIRST", SSL_OP_NON_EXPORT_FIRST
 395     },
 396 #endif
 397 #if SSL_OP_CIPHER_SERVER_PREFERENCE
 398     {
 399         "CIPHER_SERVER_PREFERENCE", SSL_OP_CIPHER_SERVER_PREFERENCE
 400     },
 401 #endif
 402 #if SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
 403     {
 404         "NETSCAPE_DEMO_CIPHER_CHANGE_BUG", SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
 405     },
 406 #endif
 407 #if SSL_OP_NO_SSLv2
 408     {
 409         "NO_SSLv2", SSL_OP_NO_SSLv2
 410     },
 411 #endif
 412 #if SSL_OP_NO_SSLv3
 413     {
 414         "NO_SSLv3", SSL_OP_NO_SSLv3
 415     },
 416 #endif
 417 #if SSL_OP_NO_TLSv1
 418     {
 419         "NO_TLSv1", SSL_OP_NO_TLSv1
 420     },
 421 #endif
 422     {
 423         "", 0
 424     },
 425     {
 426         NULL, 0
 427     }
 428 };
 429
 430 /// \ingroup ServerProtocolSSLInternal
 431 static long
 432 ssl_parse_options(const char *options)
 433 {
 434     long op = SSL_OP_ALL;
 435     char *tmp;
 436     char *option;
 437
 438     if (!options)
 439         goto no_options;
 440
 441     tmp = xstrdup(options);
 442
 443     option = strtok(tmp, ":,");
 444
 445     while (option) {
 446
 447         struct ssl_option *opt = NULL, *opttmp;
 448         long value = 0;
 449         enum {
 450             MODE_ADD, MODE_REMOVE
 451         } mode;
 452
 453         switch (*option) {
 454
 455         case '!':
 456
 457         case '-':
 458             mode = MODE_REMOVE;
 459             option++;
 460             break;
 461
 462         case '+':
 463             mode = MODE_ADD;
 464             option++;
 465             break;
 466
 467         default:
 468             mode = MODE_ADD;
 469             break;
 470         }
 471
 472         for (opttmp = ssl_options; opttmp->name; opttmp++) {
 473             if (strcmp(opttmp->name, option) == 0) {
 474                 opt = opttmp;
 475                 break;
 476             }
 477         }
 478
 479         if (opt)
 480             value = opt->value;
 481         else if (strncmp(option, "0x", 2) == 0) {
 482             /* Special case.. hex specification */
 483             value = strtol(option + 2, NULL, 16);
 484         } else {
 485             fatalf("Unknown SSL option '%s'", option);
 486             value = 0;          /* Keep GCC happy */
 487         }
 488
 489         switch (mode) {
 490
 491         case MODE_ADD:
 492             op |= value;
 493             break;
 494
 495         case MODE_REMOVE:
 496             op &= ~value;
 497             break;
 498         }
 499
 500         option = strtok(NULL, ":,");
 501     }
 502
 503     safe_free(tmp);
 504
 505 no_options:
 506     return op;
 507 }
 508
 509 /// \ingroup ServerProtocolSSLInternal
 510 #define SSL_FLAG_NO_DEFAULT_CA          (1<<0)
 511 /// \ingroup ServerProtocolSSLInternal
 512 #define SSL_FLAG_DELAYED_AUTH           (1<<1)
 513 /// \ingroup ServerProtocolSSLInternal
 514 #define SSL_FLAG_DONT_VERIFY_PEER       (1<<2)
 515 /// \ingroup ServerProtocolSSLInternal
 516 #define SSL_FLAG_DONT_VERIFY_DOMAIN     (1<<3)
 517 /// \ingroup ServerProtocolSSLInternal
 518 #define SSL_FLAG_NO_SESSION_REUSE       (1<<4)
 519 /// \ingroup ServerProtocolSSLInternal
 520 #define SSL_FLAG_VERIFY_CRL             (1<<5)
 521 /// \ingroup ServerProtocolSSLInternal
 522 #define SSL_FLAG_VERIFY_CRL_ALL         (1<<6)
 523
 524 /// \ingroup ServerProtocolSSLInternal
 525 static long
 526 ssl_parse_flags(const char *flags)
 527 {
 528     long fl = 0;
 529     char *tmp;
 530     char *flag;
 531
 532     if (!flags)
 533         return 0;
 534
 535     tmp = xstrdup(flags);
 536
 537     flag = strtok(tmp, ":,");
 538
 539     while (flag) {
 540         if (strcmp(flag, "NO_DEFAULT_CA") == 0)
 541             fl |= SSL_FLAG_NO_DEFAULT_CA;
 542         else if (strcmp(flag, "DELAYED_AUTH") == 0)
 543             fl |= SSL_FLAG_DELAYED_AUTH;
 544         else if (strcmp(flag, "DONT_VERIFY_PEER") == 0)
 545             fl |= SSL_FLAG_DONT_VERIFY_PEER;
 546         else if (strcmp(flag, "DONT_VERIFY_DOMAIN") == 0)
 547             fl |= SSL_FLAG_DONT_VERIFY_DOMAIN;
 548         else if (strcmp(flag, "NO_SESSION_REUSE") == 0)
 549             fl |= SSL_FLAG_NO_SESSION_REUSE;
 550
 551 #if X509_V_FLAG_CRL_CHECK
 552
 553         else if (strcmp(flag, "VERIFY_CRL") == 0)
 554             fl |= SSL_FLAG_VERIFY_CRL;
 555         else if (strcmp(flag, "VERIFY_CRL_ALL") == 0)
 556             fl |= SSL_FLAG_VERIFY_CRL_ALL;
 557
 558 #endif
 559
 560         else
 561             fatalf("Unknown ssl flag '%s'", flag);
 562
 563         flag = strtok(NULL, ":,");
 564     }
 565
 566     safe_free(tmp);
 567     return fl;
 568 }
 569
 570 // "dup" function for SSL_get_ex_new_index("cert_err_check")
 571 static int
 572 ssl_dupAclChecklist(CRYPTO_EX_DATA *, CRYPTO_EX_DATA *, void *,
 573                     int, long, void *)
 574 {
 575     // We do not support duplication of ACLCheckLists.
 576     // If duplication is needed, we can count copies with cbdata.
 577     assert(false);
 578     return 0;
 579 }
 580
 581 // "free" function for SSL_get_ex_new_index("cert_err_check")
 582 static void
 583 ssl_freeAclChecklist(void *, void *ptr, CRYPTO_EX_DATA *,
 584                      int, long, void *)
 585 {
 586     delete static_cast<ACLChecklist *>(ptr); // may be NULL
 587 }
 588
 589 // "free" function for SSL_get_ex_new_index("ssl_error_detail")
 590 static void
 591 ssl_free_ErrorDetail(void *, void *ptr, CRYPTO_EX_DATA *,
 592                      int, long, void *)
 593 {
 594     Ssl::ErrorDetail  *errDetail = static_cast <Ssl::ErrorDetail *>(ptr);
 595     delete errDetail;
 596 }
 597
 598 static void
 599 ssl_free_SslErrNoList(void *, void *ptr, CRYPTO_EX_DATA *,
 600                      int, long, void *)
 601 {
 602     Ssl::Errors *errNo = static_cast <Ssl::Errors *>(ptr);
 603     delete errNo;
 604 }
 605
 606 // "free" function for X509 certificates
 607 static void
 608 ssl_free_X509(void *, void *ptr, CRYPTO_EX_DATA *,
 609                      int, long, void *)
 610 {
 611     X509  *cert = static_cast <X509 *>(ptr);
 612     X509_free(cert);
 613 }
 614
 615 /// \ingroup ServerProtocolSSLInternal
 616 static void
 617 ssl_initialize(void)
 618 {
 619     static int ssl_initialized = 0;
 620
 621     if (!ssl_initialized) {
 622         ssl_initialized = 1;
 623         SSL_load_error_strings();
 624         SSLeay_add_ssl_algorithms();
 625 #if HAVE_OPENSSL_ENGINE_H
 626
 627         if (Config.SSL.ssl_engine) {
 628             ENGINE *e;
 629
 630             if (!(e = ENGINE_by_id(Config.SSL.ssl_engine))) {
 631                 fatalf("Unable to find SSL engine '%s'\n", Config.SSL.ssl_engine);
 632             }
 633
 634             if (!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
 635                 int ssl_error = ERR_get_error();
 636                 fatalf("Failed to initialise SSL engine: %s\n",
 637                        ERR_error_string(ssl_error, NULL));
 638             }
 639         }
 640
 641 #else
 642         if (Config.SSL.ssl_engine) {
 643             fatalf("Your OpenSSL has no SSL engine support\n");
 644         }
 645
 646 #endif
 647
 648     }
 649
 650     ssl_ex_index_server = SSL_get_ex_new_index(0, (void *) "server", NULL, NULL, NULL);
 651     ssl_ctx_ex_index_dont_verify_domain = SSL_CTX_get_ex_new_index(0, (void *) "dont_verify_domain", NULL, NULL, NULL);
 652     ssl_ex_index_cert_error_check = SSL_get_ex_new_index(0, (void *) "cert_error_check", NULL, &ssl_dupAclChecklist, &ssl_freeAclChecklist);
 653     ssl_ex_index_ssl_error_detail = SSL_get_ex_new_index(0, (void *) "ssl_error_detail", NULL, NULL, &ssl_free_ErrorDetail);
 654     ssl_ex_index_ssl_peeked_cert  = SSL_get_ex_new_index(0, (void *) "ssl_peeked_cert", NULL, NULL, &ssl_free_X509);
 655     ssl_ex_index_ssl_error_sslerrno =  SSL_get_ex_new_index(0, (void *) "ssl_error_sslerrno", NULL, NULL, &ssl_free_SslErrNoList);
 656 }
 657
 658 /// \ingroup ServerProtocolSSLInternal
 659 static int
 660 ssl_load_crl(SSL_CTX *sslContext, const char *CRLfile)
 661 {
 662     X509_STORE *st = SSL_CTX_get_cert_store(sslContext);
 663     X509_CRL *crl;
 664     BIO *in = BIO_new_file(CRLfile, "r");
 665     int count = 0;
 666
 667     if (!in) {
 668         debugs(83, 2, "WARNING: Failed to open CRL file '" << CRLfile << "'");
 669         return 0;
 670     }
 671
 672     while ((crl = PEM_read_bio_X509_CRL(in,NULL,NULL,NULL))) {
 673         if (!X509_STORE_add_crl(st, crl))
 674             debugs(83, 2, "WARNING: Failed to add CRL from file '" << CRLfile << "'");
 675         else
 676             count++;
 677
 678         X509_CRL_free(crl);
 679     }
 680
 681     BIO_free(in);
 682     return count;
 683 }
 684
 685 SSL_CTX *
 686 sslCreateServerContext(const char *certfile, const char *keyfile, int version, const char *cipher, const char *options, const char *flags, const char *clientCA, const char *CAfile, const char *CApath, const char *CRLfile, const char *dhfile, const char *context)
 687 {
 688     int ssl_error;
 689 #if OPENSSL_VERSION_NUMBER < 0x00909000L
 690     SSL_METHOD *method;
 691 #else
 692     const SSL_METHOD *method;
 693 #endif
 694     SSL_CTX *sslContext;
 695     long fl = ssl_parse_flags(flags);
 696
 697     ssl_initialize();
 698
 699     if (!keyfile)
 700         keyfile = certfile;
 701
 702     if (!certfile)
 703         certfile = keyfile;
 704
 705     if (!CAfile)
 706         CAfile = clientCA;
 707
 708     switch (version) {
 709
 710     case 2:
 711 #ifndef OPENSSL_NO_SSL2
 712         debugs(83, 5, "Using SSLv2.");
 713         method = SSLv2_server_method();
 714 #else
 715         debugs(83, DBG_IMPORTANT, "SSLv2 is not available in this Proxy.");
 716         return NULL;
 717 #endif
 718         break;
 719
 720     case 3:
 721         debugs(83, 5, "Using SSLv3.");
 722         method = SSLv3_server_method();
 723         break;
 724
 725     case 4:
 726         debugs(83, 5, "Using TLSv1.");
 727         method = TLSv1_server_method();
 728         break;
 729
 730     case 1:
 731
 732     default:
 733         debugs(83, 5, "Using SSLv2/SSLv3.");
 734         method = SSLv23_server_method();
 735         break;
 736     }
 737
 738     sslContext = SSL_CTX_new(method);
 739
 740     if (sslContext == NULL) {
 741         ssl_error = ERR_get_error();
 742         fatalf("Failed to allocate SSL context: %s\n",
 743                ERR_error_string(ssl_error, NULL));
 744     }
 745
 746     SSL_CTX_set_options(sslContext, ssl_parse_options(options));
 747
 748     if (context && *context) {
 749         SSL_CTX_set_session_id_context(sslContext, (const unsigned char *)context, strlen(context));
 750     }
 751
 752     if (fl & SSL_FLAG_NO_SESSION_REUSE) {
 753         SSL_CTX_set_session_cache_mode(sslContext, SSL_SESS_CACHE_OFF);
 754     }
 755
 756     if (Config.SSL.unclean_shutdown) {
 757         debugs(83, 5, "Enabling quiet SSL shutdowns (RFC violation).");
 758
 759         SSL_CTX_set_quiet_shutdown(sslContext, 1);
 760     }
 761
 762     if (cipher) {
 763         debugs(83, 5, "Using chiper suite " << cipher << ".");
 764
 765         if (!SSL_CTX_set_cipher_list(sslContext, cipher)) {
 766             ssl_error = ERR_get_error();
 767             fatalf("Failed to set SSL cipher suite '%s': %s\n",
 768                    cipher, ERR_error_string(ssl_error, NULL));
 769         }
 770     }
 771
 772     debugs(83, DBG_IMPORTANT, "Using certificate in " << certfile);
 773
 774     if (!SSL_CTX_use_certificate_chain_file(sslContext, certfile)) {
 775         ssl_error = ERR_get_error();
 776         debugs(83, DBG_CRITICAL, "ERROR: Failed to acquire SSL certificate '" << certfile << "': " << ERR_error_string(ssl_error, NULL));
 777         SSL_CTX_free(sslContext);
 778         return NULL;
 779     }
 780
 781     debugs(83, DBG_IMPORTANT, "Using private key in " << keyfile);
 782     ssl_ask_password(sslContext, keyfile);
 783
 784     if (!SSL_CTX_use_PrivateKey_file(sslContext, keyfile, SSL_FILETYPE_PEM)) {
 785         ssl_error = ERR_get_error();
 786         debugs(83, DBG_CRITICAL, "ERROR: Failed to acquire SSL private key '" << keyfile << "': " << ERR_error_string(ssl_error, NULL));
 787         SSL_CTX_free(sslContext);
 788         return NULL;
 789     }
 790
 791     debugs(83, 5, "Comparing private and public SSL keys.");
 792
 793     if (!SSL_CTX_check_private_key(sslContext)) {
 794         ssl_error = ERR_get_error();
 795         debugs(83, DBG_CRITICAL, "ERROR: SSL private key '" << certfile << "' does not match public key '" <<
 796                keyfile << "': " << ERR_error_string(ssl_error, NULL));
 797         SSL_CTX_free(sslContext);
 798         return NULL;
 799     }
 800
 801     debugs(83, 9, "Setting RSA key generation callback.");
 802     SSL_CTX_set_tmp_rsa_callback(sslContext, ssl_temp_rsa_cb);
 803
 804     debugs(83, 9, "Setting CA certificate locations.");
 805
 806     if ((CAfile || CApath) && !SSL_CTX_load_verify_locations(sslContext, CAfile, CApath)) {
 807         ssl_error = ERR_get_error();
 808         debugs(83, DBG_IMPORTANT, "WARNING: Ignoring error setting CA certificate locations: " << ERR_error_string(ssl_error, NULL));
 809     }
 810
 811     if (!(fl & SSL_FLAG_NO_DEFAULT_CA) &&
 812             !SSL_CTX_set_default_verify_paths(sslContext)) {
 813         ssl_error = ERR_get_error();
 814         debugs(83, DBG_IMPORTANT, "WARNING: Ignoring error setting default CA certificate location: " << ERR_error_string(ssl_error, NULL));
 815     }
 816
 817     if (clientCA) {
 818         STACK_OF(X509_NAME) *cert_names;
 819         debugs(83, 9, "Set client certifying authority list.");
 820         cert_names = SSL_load_client_CA_file(clientCA);
 821
 822         if (cert_names == NULL) {
 823             debugs(83, DBG_IMPORTANT, "ERROR: loading the client CA certificates from '" << clientCA << "\': " << ERR_error_string(ERR_get_error(),NULL));
 824             SSL_CTX_free(sslContext);
 825             return NULL;
 826         }
 827
 828         ERR_clear_error();
 829         SSL_CTX_set_client_CA_list(sslContext, cert_names);
 830
 831         if (fl & SSL_FLAG_DELAYED_AUTH) {
 832             debugs(83, 9, "Not requesting client certificates until acl processing requires one");
 833             SSL_CTX_set_verify(sslContext, SSL_VERIFY_NONE, NULL);
 834         } else {
 835             debugs(83, 9, "Requiring client certificates.");
 836             SSL_CTX_set_verify(sslContext, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, ssl_verify_cb);
 837         }
 838
 839         if (CRLfile) {
 840             ssl_load_crl(sslContext, CRLfile);
 841             fl |= SSL_FLAG_VERIFY_CRL;
 842         }
 843
 844 #if X509_V_FLAG_CRL_CHECK
 845         if (fl & SSL_FLAG_VERIFY_CRL_ALL)
 846             X509_STORE_set_flags(SSL_CTX_get_cert_store(sslContext), X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
 847         else if (fl & SSL_FLAG_VERIFY_CRL)
 848             X509_STORE_set_flags(SSL_CTX_get_cert_store(sslContext), X509_V_FLAG_CRL_CHECK);
 849
 850 #endif
 851
 852     } else {
 853         debugs(83, 9, "Not requiring any client certificates");
 854         SSL_CTX_set_verify(sslContext, SSL_VERIFY_NONE, NULL);
 855     }
 856
 857     if (dhfile) {
 858         FILE *in = fopen(dhfile, "r");
 859         DH *dh = NULL;
 860         int codes;
 861
 862         if (in) {
 863             dh = PEM_read_DHparams(in, NULL, NULL, NULL);
 864             fclose(in);
 865         }
 866
 867         if (!dh)
 868             debugs(83, DBG_IMPORTANT, "WARNING: Failed to read DH parameters '" << dhfile << "'");
 869         else if (dh && DH_check(dh, &codes) == 0) {
 870             if (codes) {
 871                 debugs(83, DBG_IMPORTANT, "WARNING: Failed to verify DH parameters '" << dhfile  << "' (" << std::hex << codes  << ")");
 872                 DH_free(dh);
 873                 dh = NULL;
 874             }
 875         }
 876
 877         if (dh)
 878             SSL_CTX_set_tmp_dh(sslContext, dh);
 879     }
 880
 881     if (fl & SSL_FLAG_DONT_VERIFY_DOMAIN)
 882         SSL_CTX_set_ex_data(sslContext, ssl_ctx_ex_index_dont_verify_domain, (void *) -1);
 883
 884     return sslContext;
 885 }
 886
 887 SSL_CTX *
 888 sslCreateClientContext(const char *certfile, const char *keyfile, int version, const char *cipher, const char *options, const char *flags, const char *CAfile, const char *CApath, const char *CRLfile)
 889 {
 890     int ssl_error;
 891 #if OPENSSL_VERSION_NUMBER < 0x00909000L
 892     SSL_METHOD *method;
 893 #else
 894     const SSL_METHOD *method;
 895 #endif
 896     SSL_CTX *sslContext;
 897     long fl = ssl_parse_flags(flags);
 898
 899     ssl_initialize();
 900
 901     if (!keyfile)
 902         keyfile = certfile;
 903
 904     if (!certfile)
 905         certfile = keyfile;
 906
 907     switch (version) {
 908
 909     case 2:
 910 #ifndef OPENSSL_NO_SSL2
 911         debugs(83, 5, "Using SSLv2.");
 912         method = SSLv2_client_method();
 913 #else
 914         debugs(83, DBG_IMPORTANT, "SSLv2 is not available in this Proxy.");
 915         return NULL;
 916 #endif
 917         break;
 918
 919     case 3:
 920         debugs(83, 5, "Using SSLv3.");
 921         method = SSLv3_client_method();
 922         break;
 923
 924     case 4:
 925         debugs(83, 5, "Using TLSv1.");
 926         method = TLSv1_client_method();
 927         break;
 928
 929     case 1:
 930
 931     default:
 932         debugs(83, 5, "Using SSLv2/SSLv3.");
 933         method = SSLv23_client_method();
 934         break;
 935     }
 936
 937     sslContext = SSL_CTX_new(method);
 938
 939     if (sslContext == NULL) {
 940         ssl_error = ERR_get_error();
 941         fatalf("Failed to allocate SSL context: %s\n",
 942                ERR_error_string(ssl_error, NULL));
 943     }
 944
 945     SSL_CTX_set_options(sslContext, ssl_parse_options(options));
 946
 947     if (cipher) {
 948         debugs(83, 5, "Using chiper suite " << cipher << ".");
 949
 950         if (!SSL_CTX_set_cipher_list(sslContext, cipher)) {
 951             ssl_error = ERR_get_error();
 952             fatalf("Failed to set SSL cipher suite '%s': %s\n",
 953                    cipher, ERR_error_string(ssl_error, NULL));
 954         }
 955     }
 956
 957     if (certfile) {
 958         debugs(83, 1, "Using certificate in " << certfile);
 959
 960         if (!SSL_CTX_use_certificate_chain_file(sslContext, certfile)) {
 961             ssl_error = ERR_get_error();
 962             fatalf("Failed to acquire SSL certificate '%s': %s\n",
 963                    certfile, ERR_error_string(ssl_error, NULL));
 964         }
 965
 966         debugs(83, 1, "Using private key in " << keyfile);
 967         ssl_ask_password(sslContext, keyfile);
 968
 969         if (!SSL_CTX_use_PrivateKey_file(sslContext, keyfile, SSL_FILETYPE_PEM)) {
 970             ssl_error = ERR_get_error();
 971             fatalf("Failed to acquire SSL private key '%s': %s\n",
 972                    keyfile, ERR_error_string(ssl_error, NULL));
 973         }
 974
 975         debugs(83, 5, "Comparing private and public SSL keys.");
 976
 977         if (!SSL_CTX_check_private_key(sslContext)) {
 978             ssl_error = ERR_get_error();
 979             fatalf("SSL private key '%s' does not match public key '%s': %s\n",
 980                    certfile, keyfile, ERR_error_string(ssl_error, NULL));
 981         }
 982     }
 983
 984     debugs(83, 9, "Setting RSA key generation callback.");
 985     SSL_CTX_set_tmp_rsa_callback(sslContext, ssl_temp_rsa_cb);
 986
 987     if (fl & SSL_FLAG_DONT_VERIFY_PEER) {
 988         debugs(83, 2, "NOTICE: Peer certificates are not verified for validity!");
 989         SSL_CTX_set_verify(sslContext, SSL_VERIFY_NONE, NULL);
 990     } else {
 991         debugs(83, 9, "Setting certificate verification callback.");
 992         SSL_CTX_set_verify(sslContext, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, ssl_verify_cb);
 993     }
 994
 995     debugs(83, 9, "Setting CA certificate locations.");
 996
 997     if ((CAfile || CApath) && !SSL_CTX_load_verify_locations(sslContext, CAfile, CApath)) {
 998         ssl_error = ERR_get_error();
 999         debugs(83, DBG_IMPORTANT, "WARNING: Ignoring error setting CA certificate locations: " << ERR_error_string(ssl_error, NULL));
1000     }
1001
1002     if (CRLfile) {
1003         ssl_load_crl(sslContext, CRLfile);
1004         fl |= SSL_FLAG_VERIFY_CRL;
1005     }
1006
1007 #if X509_V_FLAG_CRL_CHECK
1008     if (fl & SSL_FLAG_VERIFY_CRL_ALL)
1009         X509_STORE_set_flags(SSL_CTX_get_cert_store(sslContext), X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
1010     else if (fl & SSL_FLAG_VERIFY_CRL)
1011         X509_STORE_set_flags(SSL_CTX_get_cert_store(sslContext), X509_V_FLAG_CRL_CHECK);
1012
1013 #endif
1014
1015     if (!(fl & SSL_FLAG_NO_DEFAULT_CA) &&
1016             !SSL_CTX_set_default_verify_paths(sslContext)) {
1017         ssl_error = ERR_get_error();
1018         debugs(83, DBG_IMPORTANT, "WARNING: Ignoring error setting default CA certificate location: " << ERR_error_string(ssl_error, NULL));
1019     }
1020
1021     return sslContext;
1022 }
1023
1024 /// \ingroup ServerProtocolSSLInternal
1025 int
1026 ssl_read_method(int fd, char *buf, int len)
1027 {
1028     SSL *ssl = fd_table[fd].ssl;
1029     int i;
1030
1031 #if DONT_DO_THIS
1032
1033     if (!SSL_is_init_finished(ssl)) {
1034         errno = ENOTCONN;
1035         return -1;
1036     }
1037
1038 #endif
1039
1040     i = SSL_read(ssl, buf, len);
1041
1042     if (i > 0 && SSL_pending(ssl) > 0) {
1043         debugs(83, 2, "SSL FD " << fd << " is pending");
1044         fd_table[fd].flags.read_pending = 1;
1045     } else
1046         fd_table[fd].flags.read_pending = 0;
1047
1048     return i;
1049 }
1050
1051 /// \ingroup ServerProtocolSSLInternal
1052 int
1053 ssl_write_method(int fd, const char *buf, int len)
1054 {
1055     SSL *ssl = fd_table[fd].ssl;
1056     int i;
1057
1058     if (!SSL_is_init_finished(ssl)) {
1059         errno = ENOTCONN;
1060         return -1;
1061     }
1062
1063     i = SSL_write(ssl, buf, len);
1064
1065     return i;
1066 }
1067
1068 void
1069 ssl_shutdown_method(SSL *ssl)
1070 {
1071     SSL_shutdown(ssl);
1072 }
1073
1074 /// \ingroup ServerProtocolSSLInternal
1075 static const char *
1076 ssl_get_attribute(X509_NAME * name, const char *attribute_name)
1077 {
1078     static char buffer[1024];
1079     int nid;
1080
1081     buffer[0] = '\0';
1082
1083     if (strcmp(attribute_name, "DN") == 0) {
1084         X509_NAME_oneline(name, buffer, sizeof(buffer));
1085         goto done;
1086     }
1087
1088     nid = OBJ_txt2nid((char *) attribute_name);
1089
1090     if (nid == 0) {
1091         debugs(83, 1, "WARNING: Unknown SSL attribute name '" << attribute_name << "'");
1092         return NULL;
1093     }
1094
1095     X509_NAME_get_text_by_NID(name, nid, buffer, sizeof(buffer));
1096
1097 done:
1098     return *buffer ? buffer : NULL;
1099 }
1100
1101 /// \ingroup ServerProtocolSSLInternal
1102 const char *
1103 sslGetUserAttribute(SSL * ssl, const char *attribute_name)
1104 {
1105     X509 *cert;
1106     X509_NAME *name;
1107     const char *ret;
1108
1109     if (!ssl)
1110         return NULL;
1111
1112     cert = SSL_get_peer_certificate(ssl);
1113
1114     if (!cert)
1115         return NULL;
1116
1117     name = X509_get_subject_name(cert);
1118
1119     ret = ssl_get_attribute(name, attribute_name);
1120
1121     X509_free(cert);
1122
1123     return ret;
1124 }
1125
1126 /// \ingroup ServerProtocolSSLInternal
1127 const char *
1128 sslGetCAAttribute(SSL * ssl, const char *attribute_name)
1129 {
1130     X509 *cert;
1131     X509_NAME *name;
1132     const char *ret;
1133
1134     if (!ssl)
1135         return NULL;
1136
1137     cert = SSL_get_peer_certificate(ssl);
1138
1139     if (!cert)
1140         return NULL;
1141
1142     name = X509_get_issuer_name(cert);
1143
1144     ret = ssl_get_attribute(name, attribute_name);
1145
1146     X509_free(cert);
1147
1148     return ret;
1149 }
1150
1151 const char *
1152 sslGetUserEmail(SSL * ssl)
1153 {
1154     return sslGetUserAttribute(ssl, "emailAddress");
1155 }
1156
1157 const char *
1158 sslGetUserCertificatePEM(SSL *ssl)
1159 {
1160     X509 *cert;
1161     BIO *mem;
1162     static char *str = NULL;
1163     char *ptr;
1164     long len;
1165
1166     safe_free(str);
1167
1168     if (!ssl)
1169         return NULL;
1170
1171     cert = SSL_get_peer_certificate(ssl);
1172
1173     if (!cert)
1174         return NULL;
1175
1176     mem = BIO_new(BIO_s_mem());
1177
1178     PEM_write_bio_X509(mem, cert);
1179
1180
1181     len = BIO_get_mem_data(mem, &ptr);
1182
1183     str = (char *)xmalloc(len + 1);
1184
1185     memcpy(str, ptr, len);
1186
1187     str[len] = '\0';
1188
1189     X509_free(cert);
1190
1191     BIO_free(mem);
1192
1193     return str;
1194 }
1195
1196 const char *
1197 sslGetUserCertificateChainPEM(SSL *ssl)
1198 {
1199     STACK_OF(X509) *chain;
1200     BIO *mem;
1201     static char *str = NULL;
1202     char *ptr;
1203     long len;
1204     int i;
1205
1206     safe_free(str);
1207
1208     if (!ssl)
1209         return NULL;
1210
1211     chain = SSL_get_peer_cert_chain(ssl);
1212
1213     if (!chain)
1214         return sslGetUserCertificatePEM(ssl);
1215
1216     mem = BIO_new(BIO_s_mem());
1217
1218     for (i = 0; i < sk_X509_num(chain); i++) {
1219         X509 *cert = sk_X509_value(chain, i);
1220         PEM_write_bio_X509(mem, cert);
1221     }
1222
1223     len = BIO_get_mem_data(mem, &ptr);
1224
1225     str = (char *)xmalloc(len + 1);
1226     memcpy(str, ptr, len);
1227     str[len] = '\0';
1228
1229     BIO_free(mem);
1230
1231     return str;
1232 }
1233
1234 /// \ingroup ServerProtocolSSLInternal
1235 /// Create SSL context and apply ssl certificate and private key to it.
1236 static SSL_CTX * createSSLContext(Ssl::X509_Pointer & x509, Ssl::EVP_PKEY_Pointer & pkey)
1237 {
1238     Ssl::SSL_CTX_Pointer sslContext(SSL_CTX_new(SSLv23_server_method()));
1239
1240     if (!SSL_CTX_use_certificate(sslContext.get(), x509.get()))
1241         return NULL;
1242
1243     if (!SSL_CTX_use_PrivateKey(sslContext.get(), pkey.get()))
1244         return NULL;
1245     return sslContext.release();
1246 }
1247
1248 SSL_CTX * Ssl::generateSslContextUsingPkeyAndCertFromMemory(const char * data)
1249 {
1250     Ssl::X509_Pointer cert;
1251     Ssl::EVP_PKEY_Pointer pkey;
1252     if (!readCertAndPrivateKeyFromMemory(cert, pkey, data))
1253         return NULL;
1254
1255     if (!cert || !pkey)
1256         return NULL;
1257
1258     return createSSLContext(cert, pkey);
1259 }
1260
1261 SSL_CTX * Ssl::generateSslContext(char const *host, Ssl::X509_Pointer const & mimicCert, Ssl::X509_Pointer const & signedX509, Ssl::EVP_PKEY_Pointer const & signedPkey, Ssl::CrtdMessage::BodyParams const &mimicExceptions)
1262 {
1263     Ssl::X509_Pointer cert;
1264     Ssl::EVP_PKEY_Pointer pkey;
1265     if (mimicCert .get()) {
1266         if (!generateSslCertificate(mimicCert, signedX509, signedPkey, cert, pkey, NULL, mimicExceptions))
1267             return NULL;
1268     }
1269     else if (!generateSslCertificateAndPrivateKey(host, signedX509, signedPkey, cert, pkey, NULL)) {
1270         return NULL;
1271     }
1272
1273     if (!cert)
1274         return NULL;
1275
1276     if (!pkey)
1277         return NULL;
1278
1279     return createSSLContext(cert, pkey);
1280 }
1281
1282 bool Ssl::verifySslCertificate(SSL_CTX * sslContext, X509 *checkCert)
1283 {
1284     // Temporary ssl for getting X509 certificate from SSL_CTX.
1285     Ssl::SSL_Pointer ssl(SSL_new(sslContext));
1286     X509 * cert = SSL_get_certificate(ssl.get());
1287     ASN1_TIME * time_notBefore = X509_get_notBefore(cert);
1288     ASN1_TIME * time_notAfter = X509_get_notAfter(cert);
1289     bool ret = (X509_cmp_current_time(time_notBefore) < 0 && X509_cmp_current_time(time_notAfter) > 0);
1290     if (!ret)
1291         return false;
1292
1293     if (checkCert)
1294          return ssl_match_certificates(cert, checkCert);
1295
1296     return true;
1297 }
1298
1299 bool
1300 Ssl::setClientSNI(SSL *ssl, const char *fqdn)
1301 {
1302     //The SSL_CTRL_SET_TLSEXT_HOSTNAME is a openssl macro which indicates
1303     // if the TLS servername extension (SNI) is enabled in openssl library.
1304 #if defined(SSL_CTRL_SET_TLSEXT_HOSTNAME)
1305     if (!SSL_set_tlsext_host_name(ssl, fqdn)) {
1306         const int ssl_error = ERR_get_error();
1307         debugs(83, 3,  "WARNING: unable to set TLS servername extension (SNI): " <<
1308                ERR_error_string(ssl_error, NULL) << "\n");
1309         return false;
1310     }
1311     return true;
1312 #else
1313     debugs(83, 7,  "no support for TLS servername extension (SNI)\n");
1314     return false;
1315 #endif
1316 }
1317
1318 void Ssl::addChainToSslContext(SSL_CTX *sslContext, STACK_OF(X509) *chain)
1319 {
1320     if (!chain)
1321         return;
1322
1323     for (int i = 0; i < sk_X509_num(chain); i++) {
1324         X509 *cert = sk_X509_value(chain, i);
1325         if (SSL_CTX_add_extra_chain_cert(sslContext, cert)) {
1326             // increase the certificate lock
1327             CRYPTO_add(&(cert->references),1,CRYPTO_LOCK_X509);
1328         } else {
1329             const int ssl_error = ERR_get_error();
1330             debugs(83, DBG_IMPORTANT, "WARNING: can not add certificate to SSL context chain: " << ERR_error_string(ssl_error, NULL));
1331         }
1332     }
1333 }
1334
1335 /**
1336  \ingroup ServerProtocolSSLInternal
1337  * Read certificate from file.
1338  * See also: static readSslX509Certificate function, gadgets.cc file
1339  */
1340 static X509 * readSslX509CertificatesChain(char const * certFilename,  STACK_OF(X509)* chain)
1341 {
1342     if (!certFilename)
1343         return NULL;
1344     Ssl::BIO_Pointer bio(BIO_new(BIO_s_file_internal()));
1345     if (!bio)
1346         return NULL;
1347     if (!BIO_read_filename(bio.get(), certFilename))
1348         return NULL;
1349     X509 *certificate = PEM_read_bio_X509(bio.get(), NULL, NULL, NULL);
1350
1351     if (certificate && chain) {
1352
1353         if (X509_check_issued(certificate, certificate) == X509_V_OK)
1354             debugs(83, 5, "Certificate is self-signed, will not be chained");
1355         else {
1356             if (sk_X509_push(chain, certificate))
1357                 CRYPTO_add(&(certificate->references), 1, CRYPTO_LOCK_X509);
1358             else
1359                 debugs(83, DBG_IMPORTANT, "WARNING: unable to add signing certificate to cert chain");
1360             // and add to the chain any certificate loaded from the file
1361             while (X509 *ca = PEM_read_bio_X509(bio.get(), NULL, NULL, NULL)) {
1362                 if (!sk_X509_push(chain, ca))
1363                     debugs(83, DBG_IMPORTANT, "WARNING: unable to add CA certificate to cert chain");
1364             }
1365         }
1366     }
1367
1368     return certificate;
1369 }
1370
1371 void Ssl::readCertChainAndPrivateKeyFromFiles(X509_Pointer & cert, EVP_PKEY_Pointer & pkey, X509_STACK_Pointer & chain, char const * certFilename, char const * keyFilename)
1372 {
1373     if (keyFilename == NULL)
1374         keyFilename = certFilename;
1375     if (!chain)
1376         chain.reset(sk_X509_new_null());
1377     if (!chain)
1378         debugs(83, DBG_IMPORTANT, "WARNING: unable to allocate memory for cert chain");
1379     pkey.reset(readSslPrivateKey(keyFilename));
1380     cert.reset(readSslX509CertificatesChain(certFilename, chain.get()));
1381     if (!pkey || !cert || !X509_check_private_key(cert.get(), pkey.get())) {
1382         pkey.reset(NULL);
1383         cert.reset(NULL);
1384     }
1385 }
1386
1387 const char *Ssl::CommonHostName(X509 *x509)
1388 {
1389     static char name[256] = ""; // stores common name (CN)
1390
1391     if (!x509)
1392         return NULL;
1393
1394     // TODO: What if CN is a UTF8String? See X509_NAME_get_index_by_NID(3ssl).
1395     const int nameLen = X509_NAME_get_text_by_NID(
1396         X509_get_subject_name(x509),
1397         NID_commonName,  name, sizeof(name));
1398
1399     if (nameLen > 0)
1400         return name;
1401
1402     return NULL;
1403 }
1404 #endif /* USE_SSL */