1 /* 2 * Copyright (c) 2000-2006, 2008, 2009 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 */ 10 11 #include <sendmail.h> 12 13 SM_RCSID("@(#)$Id: tls.c,v 8.114 2009/08/10 15:11:09 ca Exp $") 14 15 #if STARTTLS 16 # include <openssl/err.h> 17 # include <openssl/bio.h> 18 # include <openssl/pem.h> 19 # ifndef HASURANDOMDEV 20 # include <openssl/rand.h> 21 # endif /* ! HASURANDOMDEV */ 22 # if !TLS_NO_RSA 23 static RSA *rsa_tmp = NULL; /* temporary RSA key */ 24 static RSA *tmp_rsa_key __P((SSL *, int, int)); 25 # endif /* !TLS_NO_RSA */ 26 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 27 static int tls_verify_cb __P((X509_STORE_CTX *)); 28 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 29 static int tls_verify_cb __P((X509_STORE_CTX *, void *)); 30 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 31 32 # if OPENSSL_VERSION_NUMBER > 0x00907000L 33 static int x509_verify_cb __P((int, X509_STORE_CTX *)); 34 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 35 36 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 37 # define CONST097 38 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 39 # define CONST097 const 40 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 41 static void apps_ssl_info_cb __P((CONST097 SSL *, int , int)); 42 static bool tls_ok_f __P((char *, char *, int)); 43 static bool tls_safe_f __P((char *, long, bool)); 44 static int tls_verify_log __P((int, X509_STORE_CTX *, char *)); 45 46 # if !NO_DH 47 static DH *get_dh512 __P((void)); 48 49 static unsigned char dh512_p[] = 50 { 51 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75, 52 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F, 53 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3, 54 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12, 55 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C, 56 0x47,0x74,0xE8,0x33 57 }; 58 static unsigned char dh512_g[] = 59 { 60 0x02 61 }; 62 63 static DH * 64 get_dh512() 65 { 66 DH *dh = NULL; 67 68 if ((dh = DH_new()) == NULL) 69 return NULL; 70 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 71 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 72 if ((dh->p == NULL) || (dh->g == NULL)) 73 return NULL; 74 return dh; 75 } 76 # endif /* !NO_DH */ 77 78 79 /* 80 ** TLS_RAND_INIT -- initialize STARTTLS random generator 81 ** 82 ** Parameters: 83 ** randfile -- name of file with random data 84 ** logl -- loglevel 85 ** 86 ** Returns: 87 ** success/failure 88 ** 89 ** Side Effects: 90 ** initializes PRNG for tls library. 91 */ 92 93 # define MIN_RAND_BYTES 128 /* 1024 bits */ 94 95 # define RF_OK 0 /* randfile OK */ 96 # define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 97 # define RF_UNKNOWN 2 /* unknown prefix for randfile */ 98 99 # define RI_NONE 0 /* no init yet */ 100 # define RI_SUCCESS 1 /* init was successful */ 101 # define RI_FAIL 2 /* init failed */ 102 103 static bool tls_rand_init __P((char *, int)); 104 105 static bool 106 tls_rand_init(randfile, logl) 107 char *randfile; 108 int logl; 109 { 110 # ifndef HASURANDOMDEV 111 /* not required if /dev/urandom exists, OpenSSL does it internally */ 112 113 bool ok; 114 int randdef; 115 static int done = RI_NONE; 116 117 /* 118 ** initialize PRNG 119 */ 120 121 /* did we try this before? if yes: return old value */ 122 if (done != RI_NONE) 123 return done == RI_SUCCESS; 124 125 /* set default values */ 126 ok = false; 127 done = RI_FAIL; 128 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 129 # if EGD 130 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 131 { 132 randfile += 4; 133 if (RAND_egd(randfile) < 0) 134 { 135 sm_syslog(LOG_WARNING, NOQID, 136 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 137 randfile); 138 } 139 else 140 ok = true; 141 } 142 else 143 # endif /* EGD */ 144 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 145 { 146 int fd; 147 long sff; 148 struct stat st; 149 150 randfile += 5; 151 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 152 | SFF_NOGWFILES | SFF_NOWWFILES 153 | SFF_NOGRFILES | SFF_NOWRFILES 154 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 155 if (DontLockReadFiles) 156 sff |= SFF_NOLOCK; 157 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 158 { 159 if (fstat(fd, &st) < 0) 160 { 161 if (LogLevel > logl) 162 sm_syslog(LOG_ERR, NOQID, 163 "STARTTLS: can't fstat(%s)", 164 randfile); 165 } 166 else 167 { 168 bool use, problem; 169 170 use = true; 171 problem = false; 172 173 /* max. age of file: 10 minutes */ 174 if (st.st_mtime + 600 < curtime()) 175 { 176 use = bitnset(DBS_INSUFFICIENTENTROPY, 177 DontBlameSendmail); 178 problem = true; 179 if (LogLevel > logl) 180 sm_syslog(LOG_ERR, NOQID, 181 "STARTTLS: RandFile %s too old: %s", 182 randfile, 183 use ? "unsafe" : 184 "unusable"); 185 } 186 if (use && st.st_size < MIN_RAND_BYTES) 187 { 188 use = bitnset(DBS_INSUFFICIENTENTROPY, 189 DontBlameSendmail); 190 problem = true; 191 if (LogLevel > logl) 192 sm_syslog(LOG_ERR, NOQID, 193 "STARTTLS: size(%s) < %d: %s", 194 randfile, 195 MIN_RAND_BYTES, 196 use ? "unsafe" : 197 "unusable"); 198 } 199 if (use) 200 ok = RAND_load_file(randfile, -1) >= 201 MIN_RAND_BYTES; 202 if (use && !ok) 203 { 204 if (LogLevel > logl) 205 sm_syslog(LOG_WARNING, NOQID, 206 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 207 randfile); 208 } 209 if (problem) 210 ok = false; 211 } 212 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 213 DontBlameSendmail)) 214 { 215 /* add this even if fstat() failed */ 216 RAND_seed((void *) &st, sizeof(st)); 217 } 218 (void) close(fd); 219 } 220 else 221 { 222 if (LogLevel > logl) 223 sm_syslog(LOG_WARNING, NOQID, 224 "STARTTLS: Warning: safeopen(%s) failed", 225 randfile); 226 } 227 } 228 else if (randdef == RF_OK) 229 { 230 if (LogLevel > logl) 231 sm_syslog(LOG_WARNING, NOQID, 232 "STARTTLS: Error: no proper random file definition %s", 233 randfile); 234 randdef = RF_UNKNOWN; 235 } 236 if (randdef == RF_MISS) 237 { 238 if (LogLevel > logl) 239 sm_syslog(LOG_WARNING, NOQID, 240 "STARTTLS: Error: missing random file definition"); 241 } 242 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 243 { 244 int i; 245 long r; 246 unsigned char buf[MIN_RAND_BYTES]; 247 248 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 249 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 250 { 251 r = get_random(); 252 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 253 } 254 RAND_seed(buf, sizeof(buf)); 255 if (LogLevel > logl) 256 sm_syslog(LOG_WARNING, NOQID, 257 "STARTTLS: Warning: random number generator not properly seeded"); 258 ok = true; 259 } 260 done = ok ? RI_SUCCESS : RI_FAIL; 261 return ok; 262 # else /* ! HASURANDOMDEV */ 263 return true; 264 # endif /* ! HASURANDOMDEV */ 265 } 266 /* 267 ** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 268 ** 269 ** Parameters: 270 ** none. 271 ** 272 ** Returns: 273 ** succeeded? 274 */ 275 276 bool 277 init_tls_library() 278 { 279 /* basic TLS initialization, ignore result for now */ 280 SSL_library_init(); 281 SSL_load_error_strings(); 282 # if 0 283 /* this is currently a macro for SSL_library_init */ 284 SSLeay_add_ssl_algorithms(); 285 # endif /* 0 */ 286 287 return tls_rand_init(RandFile, 7); 288 } 289 /* 290 ** TLS_SET_VERIFY -- request client certificate? 291 ** 292 ** Parameters: 293 ** ctx -- TLS context 294 ** ssl -- TLS structure 295 ** vrfy -- require certificate? 296 ** 297 ** Returns: 298 ** none. 299 ** 300 ** Side Effects: 301 ** Sets verification state for TLS 302 ** 303 # if TLS_VRFY_PER_CTX 304 ** Notice: 305 ** This is per TLS context, not per TLS structure; 306 ** the former is global, the latter per connection. 307 ** It would be nice to do this per connection, but this 308 ** doesn't work in the current TLS libraries :-( 309 # endif * TLS_VRFY_PER_CTX * 310 */ 311 312 void 313 tls_set_verify(ctx, ssl, vrfy) 314 SSL_CTX *ctx; 315 SSL *ssl; 316 bool vrfy; 317 { 318 # if !TLS_VRFY_PER_CTX 319 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 320 # else /* !TLS_VRFY_PER_CTX */ 321 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 322 NULL); 323 # endif /* !TLS_VRFY_PER_CTX */ 324 } 325 326 /* 327 ** status in initialization 328 ** these flags keep track of the status of the initialization 329 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 330 ** [due to permissions] 331 */ 332 333 # define TLS_S_NONE 0x00000000 /* none yet */ 334 # define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 335 # define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 336 # define TLS_S_KEY_EX 0x00000004 /* key file exists */ 337 # define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 338 # define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 339 # define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 340 # define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 341 # define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 342 # define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */ 343 # define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */ 344 345 # if _FFR_TLS_1 346 # define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 347 # define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 348 # define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 349 # define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 350 # endif /* _FFR_TLS_1 */ 351 352 # define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 353 # define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 354 # define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 355 356 /* Type of variable */ 357 # define TLS_T_OTHER 0 358 # define TLS_T_SRV 1 359 # define TLS_T_CLT 2 360 361 /* 362 ** TLS_OK_F -- can var be an absolute filename? 363 ** 364 ** Parameters: 365 ** var -- filename 366 ** fn -- what is the filename used for? 367 ** type -- type of variable 368 ** 369 ** Returns: 370 ** ok? 371 */ 372 373 static bool 374 tls_ok_f(var, fn, type) 375 char *var; 376 char *fn; 377 int type; 378 { 379 /* must be absolute pathname */ 380 if (var != NULL && *var == '/') 381 return true; 382 if (LogLevel > 12) 383 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 384 type == TLS_T_SRV ? "Server" : 385 (type == TLS_T_CLT ? "Client" : ""), fn); 386 return false; 387 } 388 /* 389 ** TLS_SAFE_F -- is a file safe to use? 390 ** 391 ** Parameters: 392 ** var -- filename 393 ** sff -- flags for safefile() 394 ** srv -- server side? 395 ** 396 ** Returns: 397 ** ok? 398 */ 399 400 static bool 401 tls_safe_f(var, sff, srv) 402 char *var; 403 long sff; 404 bool srv; 405 { 406 int ret; 407 408 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 409 S_IRUSR, NULL)) == 0) 410 return true; 411 if (LogLevel > 7) 412 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 413 srv ? "server" : "client", var, sm_errstring(ret)); 414 return false; 415 } 416 417 /* 418 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 419 ** 420 ** Parameters: 421 ** var -- filename 422 ** fn -- what is the filename used for? 423 ** req -- is the file required? 424 ** st -- status bit to set if ok 425 ** type -- type of variable 426 ** 427 ** Side Effects: 428 ** uses r, ok; may change ok and status. 429 ** 430 */ 431 432 # define TLS_OK_F(var, fn, req, st, type) if (ok) \ 433 { \ 434 r = tls_ok_f(var, fn, type); \ 435 if (r) \ 436 status |= st; \ 437 else if (req) \ 438 ok = false; \ 439 } 440 441 /* 442 ** TLS_UNR -- macro to return whether a file should be unreadable 443 ** 444 ** Parameters: 445 ** bit -- flag to test 446 ** req -- flags 447 ** 448 ** Returns: 449 ** 0/SFF_NORFILES 450 */ 451 # define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 452 # define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 453 # define TLS_KEYSFF(req) \ 454 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 455 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 456 TLS_UNR(TLS_I_KEY_UNR, req)) 457 458 /* 459 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 460 ** 461 ** Parameters: 462 ** var -- filename 463 ** sff -- flags for safefile() 464 ** req -- is the file required? 465 ** ex -- does the file exist? 466 ** st -- status bit to set if ok 467 ** srv -- server side? 468 ** 469 ** Side Effects: 470 ** uses r, ok, ex; may change ok and status. 471 ** 472 */ 473 474 # define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 475 { \ 476 r = tls_safe_f(var, sff, srv); \ 477 if (r) \ 478 status |= st; \ 479 else if (req) \ 480 ok = false; \ 481 } 482 483 /* 484 ** INITTLS -- initialize TLS 485 ** 486 ** Parameters: 487 ** ctx -- pointer to context 488 ** req -- requirements for initialization (see sendmail.h) 489 ** options -- options 490 ** srv -- server side? 491 ** certfile -- filename of certificate 492 ** keyfile -- filename of private key 493 ** cacertpath -- path to CAs 494 ** cacertfile -- file with CA(s) 495 ** dhparam -- parameters for DH 496 ** 497 ** Returns: 498 ** succeeded? 499 */ 500 501 /* 502 ** The session_id_context identifies the service that created a session. 503 ** This information is used to distinguish between multiple TLS-based 504 ** servers running on the same server. We use the name of the mail system. 505 ** Note: the session cache is not persistent. 506 */ 507 508 static char server_session_id_context[] = "sendmail8"; 509 510 /* 0.9.8a and b have a problem with SSL_OP_TLS_BLOCK_PADDING_BUG */ 511 #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) 512 # define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 1 513 #else 514 # define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 0 515 #endif 516 517 bool 518 inittls(ctx, req, options, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 519 SSL_CTX **ctx; 520 unsigned long req; 521 long options; 522 bool srv; 523 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 524 { 525 # if !NO_DH 526 static DH *dh = NULL; 527 # endif /* !NO_DH */ 528 int r; 529 bool ok; 530 long sff, status; 531 char *who; 532 # if _FFR_TLS_1 533 char *cf2, *kf2; 534 # endif /* _FFR_TLS_1 */ 535 # if SM_CONF_SHM 536 extern int ShmId; 537 # endif /* SM_CONF_SHM */ 538 # if OPENSSL_VERSION_NUMBER > 0x00907000L 539 BIO *crl_file; 540 X509_CRL *crl; 541 X509_STORE *store; 542 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 543 #if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 544 long rt_version; 545 STACK_OF(SSL_COMP) *comp_methods; 546 #endif 547 548 status = TLS_S_NONE; 549 who = srv ? "server" : "client"; 550 if (ctx == NULL) 551 { 552 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 553 /* NOTREACHED */ 554 SM_ASSERT(ctx != NULL); 555 } 556 557 /* already initialized? (we could re-init...) */ 558 if (*ctx != NULL) 559 return true; 560 ok = true; 561 562 # if _FFR_TLS_1 563 /* 564 ** look for a second filename: it must be separated by a ',' 565 ** no blanks allowed (they won't be skipped). 566 ** we change a global variable here! this change will be undone 567 ** before return from the function but only if it returns true. 568 ** this isn't a problem since in a failure case this function 569 ** won't be called again with the same (overwritten) values. 570 ** otherwise each return must be replaced with a goto endinittls. 571 */ 572 573 cf2 = NULL; 574 kf2 = NULL; 575 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 576 { 577 *cf2++ = '\0'; 578 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 579 *kf2++ = '\0'; 580 } 581 # endif /* _FFR_TLS_1 */ 582 583 /* 584 ** Check whether files/paths are defined 585 */ 586 587 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 588 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 589 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 590 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 591 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 592 TLS_S_CERTP_EX, TLS_T_OTHER); 593 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 594 TLS_S_CERTF_EX, TLS_T_OTHER); 595 596 # if OPENSSL_VERSION_NUMBER > 0x00907000L 597 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req), 598 TLS_S_CRLF_EX, TLS_T_OTHER); 599 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 600 601 # if _FFR_TLS_1 602 /* 603 ** if the second file is specified it must exist 604 ** XXX: it is possible here to define only one of those files 605 */ 606 607 if (cf2 != NULL) 608 { 609 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 610 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 611 } 612 if (kf2 != NULL) 613 { 614 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 615 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 616 } 617 # endif /* _FFR_TLS_1 */ 618 619 /* 620 ** valid values for dhparam are (only the first char is checked) 621 ** none no parameters: don't use DH 622 ** 512 generate 512 bit parameters (fixed) 623 ** 1024 generate 1024 bit parameters 624 ** /file/name read parameters from /file/name 625 ** default is: 1024 for server, 512 for client (OK? XXX) 626 */ 627 628 if (bitset(TLS_I_TRY_DH, req)) 629 { 630 if (dhparam != NULL) 631 { 632 char c = *dhparam; 633 634 if (c == '1') 635 req |= TLS_I_DH1024; 636 else if (c == '5') 637 req |= TLS_I_DH512; 638 else if (c != 'n' && c != 'N' && c != '/') 639 { 640 if (LogLevel > 12) 641 sm_syslog(LOG_WARNING, NOQID, 642 "STARTTLS=%s, error: illegal value '%s' for DHParam", 643 who, dhparam); 644 dhparam = NULL; 645 } 646 } 647 if (dhparam == NULL) 648 { 649 dhparam = srv ? "1" : "5"; 650 req |= (srv ? TLS_I_DH1024 : TLS_I_DH512); 651 } 652 else if (*dhparam == '/') 653 { 654 TLS_OK_F(dhparam, "DHParameters", 655 bitset(TLS_I_DHPAR_EX, req), 656 TLS_S_DHPAR_EX, TLS_T_OTHER); 657 } 658 } 659 if (!ok) 660 return ok; 661 662 /* certfile etc. must be "safe". */ 663 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 664 | SFF_NOGWFILES | SFF_NOWWFILES 665 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 666 if (DontLockReadFiles) 667 sff |= SFF_NOLOCK; 668 669 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 670 bitset(TLS_I_CERT_EX, req), 671 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 672 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 673 bitset(TLS_I_KEY_EX, req), 674 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 675 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 676 bitset(TLS_I_CERTF_EX, req), 677 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 678 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 679 bitset(TLS_I_DHPAR_EX, req), 680 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 681 # if OPENSSL_VERSION_NUMBER > 0x00907000L 682 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req), 683 bitset(TLS_I_CRLF_EX, req), 684 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv); 685 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 686 if (!ok) 687 return ok; 688 # if _FFR_TLS_1 689 if (cf2 != NULL) 690 { 691 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 692 bitset(TLS_I_CERT_EX, req), 693 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 694 } 695 if (kf2 != NULL) 696 { 697 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 698 bitset(TLS_I_KEY_EX, req), 699 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 700 } 701 # endif /* _FFR_TLS_1 */ 702 703 /* create a method and a new context */ 704 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 705 SSLv23_client_method())) == NULL) 706 { 707 if (LogLevel > 7) 708 sm_syslog(LOG_WARNING, NOQID, 709 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 710 who, who); 711 if (LogLevel > 9) 712 tlslogerr(who); 713 return false; 714 } 715 716 # if OPENSSL_VERSION_NUMBER > 0x00907000L 717 if (CRLFile != NULL) 718 { 719 /* get a pointer to the current certificate validation store */ 720 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */ 721 crl_file = BIO_new(BIO_s_file_internal()); 722 if (crl_file != NULL) 723 { 724 if (BIO_read_filename(crl_file, CRLFile) >= 0) 725 { 726 crl = PEM_read_bio_X509_CRL(crl_file, NULL, 727 NULL, NULL); 728 BIO_free(crl_file); 729 X509_STORE_add_crl(store, crl); 730 X509_CRL_free(crl); 731 X509_STORE_set_flags(store, 732 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 733 X509_STORE_set_verify_cb_func(store, 734 x509_verify_cb); 735 } 736 else 737 { 738 if (LogLevel > 9) 739 { 740 sm_syslog(LOG_WARNING, NOQID, 741 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed", 742 who, CRLFile); 743 } 744 745 /* avoid memory leaks */ 746 BIO_free(crl_file); 747 return false; 748 } 749 750 } 751 else if (LogLevel > 9) 752 sm_syslog(LOG_WARNING, NOQID, 753 "STARTTLS=%s, error: BIO_new=failed", who); 754 } 755 else 756 store = NULL; 757 # if _FFR_CRLPATH 758 if (CRLPath != NULL && store != NULL) 759 { 760 X509_LOOKUP *lookup; 761 762 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir()); 763 if (lookup == NULL) 764 { 765 if (LogLevel > 9) 766 { 767 sm_syslog(LOG_WARNING, NOQID, 768 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed", 769 who, CRLFile); 770 } 771 return false; 772 } 773 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM); 774 X509_STORE_set_flags(store, 775 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 776 } 777 # endif /* _FFR_CRLPATH */ 778 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 779 780 # if TLS_NO_RSA 781 /* turn off backward compatibility, required for no-rsa */ 782 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 783 # endif /* TLS_NO_RSA */ 784 785 786 # if !TLS_NO_RSA 787 /* 788 ** Create a temporary RSA key 789 ** XXX Maybe we shouldn't create this always (even though it 790 ** is only at startup). 791 ** It is a time-consuming operation and it is not always necessary. 792 ** maybe we should do it only on demand... 793 */ 794 795 if (bitset(TLS_I_RSA_TMP, req) 796 # if SM_CONF_SHM 797 && ShmId != SM_SHM_NO_ID && 798 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 799 NULL)) == NULL 800 # else /* SM_CONF_SHM */ 801 && 0 /* no shared memory: no need to generate key now */ 802 # endif /* SM_CONF_SHM */ 803 ) 804 { 805 if (LogLevel > 7) 806 { 807 sm_syslog(LOG_WARNING, NOQID, 808 "STARTTLS=%s, error: RSA_generate_key failed", 809 who); 810 if (LogLevel > 9) 811 tlslogerr(who); 812 } 813 return false; 814 } 815 # endif /* !TLS_NO_RSA */ 816 817 /* 818 ** load private key 819 ** XXX change this for DSA-only version 820 */ 821 822 if (bitset(TLS_S_KEY_OK, status) && 823 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 824 SSL_FILETYPE_PEM) <= 0) 825 { 826 if (LogLevel > 7) 827 { 828 sm_syslog(LOG_WARNING, NOQID, 829 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 830 who, keyfile); 831 if (LogLevel > 9) 832 tlslogerr(who); 833 } 834 if (bitset(TLS_I_USE_KEY, req)) 835 return false; 836 } 837 838 /* get the certificate file */ 839 if (bitset(TLS_S_CERT_OK, status) && 840 SSL_CTX_use_certificate_file(*ctx, certfile, 841 SSL_FILETYPE_PEM) <= 0) 842 { 843 if (LogLevel > 7) 844 { 845 sm_syslog(LOG_WARNING, NOQID, 846 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 847 who, certfile); 848 if (LogLevel > 9) 849 tlslogerr(who); 850 } 851 if (bitset(TLS_I_USE_CERT, req)) 852 return false; 853 } 854 855 /* check the private key */ 856 if (bitset(TLS_S_KEY_OK, status) && 857 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 858 { 859 /* Private key does not match the certificate public key */ 860 if (LogLevel > 5) 861 { 862 sm_syslog(LOG_WARNING, NOQID, 863 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 864 who, keyfile, r); 865 if (LogLevel > 9) 866 tlslogerr(who); 867 } 868 if (bitset(TLS_I_USE_KEY, req)) 869 return false; 870 } 871 872 # if _FFR_TLS_1 873 /* XXX this code is pretty much duplicated from above! */ 874 875 /* load private key */ 876 if (bitset(TLS_S_KEY2_OK, status) && 877 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 878 { 879 if (LogLevel > 7) 880 { 881 sm_syslog(LOG_WARNING, NOQID, 882 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 883 who, kf2); 884 if (LogLevel > 9) 885 tlslogerr(who); 886 } 887 } 888 889 /* get the certificate file */ 890 if (bitset(TLS_S_CERT2_OK, status) && 891 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0) 892 { 893 if (LogLevel > 7) 894 { 895 sm_syslog(LOG_WARNING, NOQID, 896 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 897 who, cf2); 898 if (LogLevel > 9) 899 tlslogerr(who); 900 } 901 } 902 903 /* also check the private key */ 904 if (bitset(TLS_S_KEY2_OK, status) && 905 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 906 { 907 /* Private key does not match the certificate public key */ 908 if (LogLevel > 5) 909 { 910 sm_syslog(LOG_WARNING, NOQID, 911 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 912 who, r); 913 if (LogLevel > 9) 914 tlslogerr(who); 915 } 916 } 917 # endif /* _FFR_TLS_1 */ 918 919 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 920 921 #if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 922 923 /* 924 ** In OpenSSL 0.9.8[ab], enabling zlib compression breaks the 925 ** padding bug work-around, leading to false positives and 926 ** failed connections. We may not interoperate with systems 927 ** with the bug, but this is better than breaking on all 0.9.8[ab] 928 ** systems that have zlib support enabled. 929 ** Note: this checks the runtime version of the library, not 930 ** just the compile time version. 931 */ 932 933 rt_version = SSLeay(); 934 if (rt_version >= 0x00908000L && rt_version <= 0x0090802fL) 935 { 936 comp_methods = SSL_COMP_get_compression_methods(); 937 if (comp_methods != NULL && sk_SSL_COMP_num(comp_methods) > 0) 938 options &= ~SSL_OP_TLS_BLOCK_PADDING_BUG; 939 } 940 #endif 941 SSL_CTX_set_options(*ctx, options); 942 943 # if !NO_DH 944 /* Diffie-Hellman initialization */ 945 if (bitset(TLS_I_TRY_DH, req)) 946 { 947 if (bitset(TLS_S_DHPAR_OK, status)) 948 { 949 BIO *bio; 950 951 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 952 { 953 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 954 BIO_free(bio); 955 if (dh == NULL && LogLevel > 7) 956 { 957 unsigned long err; 958 959 err = ERR_get_error(); 960 sm_syslog(LOG_WARNING, NOQID, 961 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 962 who, dhparam, 963 ERR_error_string(err, NULL)); 964 if (LogLevel > 9) 965 tlslogerr(who); 966 } 967 } 968 else 969 { 970 if (LogLevel > 5) 971 { 972 sm_syslog(LOG_WARNING, NOQID, 973 "STARTTLS=%s, error: BIO_new_file(%s) failed", 974 who, dhparam); 975 if (LogLevel > 9) 976 tlslogerr(who); 977 } 978 } 979 } 980 if (dh == NULL && bitset(TLS_I_DH1024, req)) 981 { 982 DSA *dsa; 983 984 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */ 985 dsa = DSA_generate_parameters(1024, NULL, 0, NULL, 986 NULL, 0, NULL); 987 dh = DSA_dup_DH(dsa); 988 DSA_free(dsa); 989 } 990 else 991 if (dh == NULL && bitset(TLS_I_DH512, req)) 992 dh = get_dh512(); 993 994 if (dh == NULL) 995 { 996 if (LogLevel > 9) 997 { 998 unsigned long err; 999 1000 err = ERR_get_error(); 1001 sm_syslog(LOG_WARNING, NOQID, 1002 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 1003 who, dhparam, 1004 ERR_error_string(err, NULL)); 1005 } 1006 if (bitset(TLS_I_REQ_DH, req)) 1007 return false; 1008 } 1009 else 1010 { 1011 SSL_CTX_set_tmp_dh(*ctx, dh); 1012 1013 /* important to avoid small subgroup attacks */ 1014 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 1015 if (LogLevel > 13) 1016 sm_syslog(LOG_INFO, NOQID, 1017 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 1018 who, 8 * DH_size(dh), *dhparam); 1019 DH_free(dh); 1020 } 1021 } 1022 # endif /* !NO_DH */ 1023 1024 1025 /* XXX do we need this cache here? */ 1026 if (bitset(TLS_I_CACHE, req)) 1027 { 1028 SSL_CTX_sess_set_cache_size(*ctx, 1); 1029 SSL_CTX_set_timeout(*ctx, 1); 1030 SSL_CTX_set_session_id_context(*ctx, 1031 (void *) &server_session_id_context, 1032 sizeof(server_session_id_context)); 1033 (void) SSL_CTX_set_session_cache_mode(*ctx, 1034 SSL_SESS_CACHE_SERVER); 1035 } 1036 else 1037 { 1038 (void) SSL_CTX_set_session_cache_mode(*ctx, 1039 SSL_SESS_CACHE_OFF); 1040 } 1041 1042 /* load certificate locations and default CA paths */ 1043 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 1044 { 1045 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 1046 cacertpath)) == 1) 1047 { 1048 # if !TLS_NO_RSA 1049 if (bitset(TLS_I_RSA_TMP, req)) 1050 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 1051 # endif /* !TLS_NO_RSA */ 1052 1053 /* 1054 ** We have to install our own verify callback: 1055 ** SSL_VERIFY_PEER requests a client cert but even 1056 ** though *FAIL_IF* isn't set, the connection 1057 ** will be aborted if the client presents a cert 1058 ** that is not "liked" (can't be verified?) by 1059 ** the TLS library :-( 1060 */ 1061 1062 /* 1063 ** XXX currently we could call tls_set_verify() 1064 ** but we hope that that function will later on 1065 ** only set the mode per connection. 1066 */ 1067 SSL_CTX_set_verify(*ctx, 1068 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 1069 : SSL_VERIFY_PEER, 1070 NULL); 1071 1072 /* install verify callback */ 1073 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 1074 NULL); 1075 SSL_CTX_set_client_CA_list(*ctx, 1076 SSL_load_client_CA_file(cacertfile)); 1077 } 1078 else 1079 { 1080 /* 1081 ** can't load CA data; do we care? 1082 ** the data is necessary to authenticate the client, 1083 ** which in turn would be necessary 1084 ** if we want to allow relaying based on it. 1085 */ 1086 if (LogLevel > 5) 1087 { 1088 sm_syslog(LOG_WARNING, NOQID, 1089 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 1090 who, cacertpath, cacertfile, r); 1091 if (LogLevel > 9) 1092 tlslogerr(who); 1093 } 1094 if (bitset(TLS_I_VRFY_LOC, req)) 1095 return false; 1096 } 1097 } 1098 1099 /* XXX: make this dependent on an option? */ 1100 if (tTd(96, 9)) 1101 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 1102 1103 # if _FFR_TLS_1 1104 /* install our own cipher list */ 1105 if (CipherList != NULL && *CipherList != '\0') 1106 { 1107 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 1108 { 1109 if (LogLevel > 7) 1110 { 1111 sm_syslog(LOG_WARNING, NOQID, 1112 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 1113 who, CipherList); 1114 1115 if (LogLevel > 9) 1116 tlslogerr(who); 1117 } 1118 /* failure if setting to this list is required? */ 1119 } 1120 } 1121 # endif /* _FFR_TLS_1 */ 1122 if (LogLevel > 12) 1123 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 1124 1125 # if _FFR_TLS_1 1126 # if 0 1127 /* 1128 ** this label is required if we want to have a "clean" exit 1129 ** see the comments above at the initialization of cf2 1130 */ 1131 1132 endinittls: 1133 # endif /* 0 */ 1134 1135 /* undo damage to global variables */ 1136 if (cf2 != NULL) 1137 *--cf2 = ','; 1138 if (kf2 != NULL) 1139 *--kf2 = ','; 1140 # endif /* _FFR_TLS_1 */ 1141 1142 return ok; 1143 } 1144 /* 1145 ** TLS_GET_INFO -- get information about TLS connection 1146 ** 1147 ** Parameters: 1148 ** ssl -- TLS connection structure 1149 ** srv -- server or client 1150 ** host -- hostname of other side 1151 ** mac -- macro storage 1152 ** certreq -- did we ask for a cert? 1153 ** 1154 ** Returns: 1155 ** result of authentication. 1156 ** 1157 ** Side Effects: 1158 ** sets macros: {cipher}, {tls_version}, {verify}, 1159 ** {cipher_bits}, {alg_bits}, {cert}, {cert_subject}, 1160 ** {cert_issuer}, {cn_subject}, {cn_issuer} 1161 */ 1162 1163 int 1164 tls_get_info(ssl, srv, host, mac, certreq) 1165 SSL *ssl; 1166 bool srv; 1167 char *host; 1168 MACROS_T *mac; 1169 bool certreq; 1170 { 1171 SSL_CIPHER *c; 1172 int b, r; 1173 long verifyok; 1174 char *s, *who; 1175 char bitstr[16]; 1176 X509 *cert; 1177 1178 c = SSL_get_current_cipher(ssl); 1179 1180 /* cast is just workaround for compiler warning */ 1181 macdefine(mac, A_TEMP, macid("{cipher}"), 1182 (char *) SSL_CIPHER_get_name(c)); 1183 b = SSL_CIPHER_get_bits(c, &r); 1184 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", b); 1185 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1186 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", r); 1187 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1188 s = SSL_CIPHER_get_version(c); 1189 if (s == NULL) 1190 s = "UNKNOWN"; 1191 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1192 1193 who = srv ? "server" : "client"; 1194 cert = SSL_get_peer_certificate(ssl); 1195 verifyok = SSL_get_verify_result(ssl); 1196 if (LogLevel > 14) 1197 sm_syslog(LOG_INFO, NOQID, 1198 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1199 who, verifyok, (unsigned long) cert); 1200 if (cert != NULL) 1201 { 1202 unsigned int n; 1203 X509_NAME *subj, *issuer; 1204 unsigned char md[EVP_MAX_MD_SIZE]; 1205 char buf[MAXNAME]; 1206 1207 subj = X509_get_subject_name(cert); 1208 issuer = X509_get_issuer_name(cert); 1209 X509_NAME_oneline(subj, buf, sizeof(buf)); 1210 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1211 xtextify(buf, "<>\")")); 1212 X509_NAME_oneline(issuer, buf, sizeof(buf)); 1213 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1214 xtextify(buf, "<>\")")); 1215 1216 #define CHECK_X509_NAME(which) \ 1217 do { \ 1218 if (r == -1) \ 1219 { \ 1220 sm_strlcpy(buf, "BadCertificateUnknown", sizeof(buf)); \ 1221 if (LogLevel > 7) \ 1222 sm_syslog(LOG_INFO, NOQID, \ 1223 "STARTTLS=%s, relay=%.100s, field=%s, status=failed to extract CN", \ 1224 who, \ 1225 host == NULL ? "local" : host, \ 1226 which); \ 1227 } \ 1228 else if ((size_t)r >= sizeof(buf) - 1) \ 1229 { \ 1230 sm_strlcpy(buf, "BadCertificateTooLong", sizeof(buf)); \ 1231 if (LogLevel > 7) \ 1232 sm_syslog(LOG_INFO, NOQID, \ 1233 "STARTTLS=%s, relay=%.100s, field=%s, status=CN too long", \ 1234 who, \ 1235 host == NULL ? "local" : host, \ 1236 which); \ 1237 } \ 1238 else if ((size_t)r > strlen(buf)) \ 1239 { \ 1240 sm_strlcpy(buf, "BadCertificateContainsNUL", \ 1241 sizeof(buf)); \ 1242 if (LogLevel > 7) \ 1243 sm_syslog(LOG_INFO, NOQID, \ 1244 "STARTTLS=%s, relay=%.100s, field=%s, status=CN contains NUL", \ 1245 who, \ 1246 host == NULL ? "local" : host, \ 1247 which); \ 1248 } \ 1249 } while (0) 1250 1251 r = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, 1252 sizeof buf); 1253 CHECK_X509_NAME("cn_subject"); 1254 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1255 xtextify(buf, "<>\")")); 1256 r = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, 1257 sizeof buf); 1258 CHECK_X509_NAME("cn_issuer"); 1259 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1260 xtextify(buf, "<>\")")); 1261 n = 0; 1262 if (X509_digest(cert, EVP_md5(), md, &n) != 0 && n > 0) 1263 { 1264 char md5h[EVP_MAX_MD_SIZE * 3]; 1265 static const char hexcodes[] = "0123456789ABCDEF"; 1266 1267 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1268 for (r = 0; r < (int) n; r++) 1269 { 1270 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1271 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1272 md5h[(r * 3) + 2] = ':'; 1273 } 1274 md5h[(n * 3) - 1] = '\0'; 1275 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h); 1276 } 1277 else 1278 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1279 } 1280 else 1281 { 1282 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1283 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1284 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1285 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1286 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1287 } 1288 switch (verifyok) 1289 { 1290 case X509_V_OK: 1291 if (cert != NULL) 1292 { 1293 s = "OK"; 1294 r = TLS_AUTH_OK; 1295 } 1296 else 1297 { 1298 s = certreq ? "NO" : "NOT", 1299 r = TLS_AUTH_NO; 1300 } 1301 break; 1302 default: 1303 s = "FAIL"; 1304 r = TLS_AUTH_FAIL; 1305 break; 1306 } 1307 macdefine(mac, A_PERM, macid("{verify}"), s); 1308 if (cert != NULL) 1309 X509_free(cert); 1310 1311 /* do some logging */ 1312 if (LogLevel > 8) 1313 { 1314 char *vers, *s1, *s2, *cbits, *algbits; 1315 1316 vers = macget(mac, macid("{tls_version}")); 1317 cbits = macget(mac, macid("{cipher_bits}")); 1318 algbits = macget(mac, macid("{alg_bits}")); 1319 s1 = macget(mac, macid("{verify}")); 1320 s2 = macget(mac, macid("{cipher}")); 1321 1322 /* XXX: maybe cut off ident info? */ 1323 sm_syslog(LOG_INFO, NOQID, 1324 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1325 who, 1326 host == NULL ? "local" : host, 1327 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1328 algbits == NULL ? "0" : algbits, 1329 cbits == NULL ? "0" : cbits); 1330 if (LogLevel > 11) 1331 { 1332 /* 1333 ** Maybe run xuntextify on the strings? 1334 ** That is easier to read but makes it maybe a bit 1335 ** more complicated to figure out the right values 1336 ** for the access map... 1337 */ 1338 1339 s1 = macget(mac, macid("{cert_subject}")); 1340 s2 = macget(mac, macid("{cert_issuer}")); 1341 sm_syslog(LOG_INFO, NOQID, 1342 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s", 1343 who, s1, s2, 1344 X509_verify_cert_error_string(verifyok)); 1345 } 1346 } 1347 return r; 1348 } 1349 /* 1350 ** ENDTLS -- shutdown secure connection 1351 ** 1352 ** Parameters: 1353 ** ssl -- SSL connection information. 1354 ** side -- server/client (for logging). 1355 ** 1356 ** Returns: 1357 ** success? (EX_* code) 1358 */ 1359 1360 int 1361 endtls(ssl, side) 1362 SSL *ssl; 1363 char *side; 1364 { 1365 int ret = EX_OK; 1366 1367 if (ssl != NULL) 1368 { 1369 int r; 1370 1371 if ((r = SSL_shutdown(ssl)) < 0) 1372 { 1373 if (LogLevel > 11) 1374 { 1375 sm_syslog(LOG_WARNING, NOQID, 1376 "STARTTLS=%s, SSL_shutdown failed: %d", 1377 side, r); 1378 tlslogerr(side); 1379 } 1380 ret = EX_SOFTWARE; 1381 } 1382 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1383 1384 /* 1385 ** Bug in OpenSSL (at least up to 0.9.6b): 1386 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1387 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1388 ** To: openssl-users@openssl.org 1389 ** Subject: Re: SSL_shutdown() woes (fwd) 1390 ** 1391 ** The side sending the shutdown alert first will 1392 ** not care about the answer of the peer but will 1393 ** immediately return with a return value of "0" 1394 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1395 ** the value of "0" and as the shutdown alert of the peer was 1396 ** not received (actually, the program did not even wait for 1397 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1398 ** is the default rule in case everything else does not apply. 1399 ** 1400 ** For your server the problem is different, because it 1401 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1402 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1403 ** server the shutdown was successfull. 1404 ** 1405 ** As is by know, you would have to call SSL_shutdown() once 1406 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1407 ** SSL_shutdown() again to actually get the server's response. 1408 ** 1409 ** In the last discussion, Bodo Moeller concluded that a 1410 ** rewrite of the shutdown code would be necessary, but 1411 ** probably with another API, as the change would not be 1412 ** compatible to the way it is now. Things do not become 1413 ** easier as other programs do not follow the shutdown 1414 ** guidelines anyway, so that a lot error conditions and 1415 ** compitibility issues would have to be caught. 1416 ** 1417 ** For now the recommondation is to ignore the error message. 1418 */ 1419 1420 else if (r == 0) 1421 { 1422 if (LogLevel > 15) 1423 { 1424 sm_syslog(LOG_WARNING, NOQID, 1425 "STARTTLS=%s, SSL_shutdown not done", 1426 side); 1427 tlslogerr(side); 1428 } 1429 ret = EX_SOFTWARE; 1430 } 1431 # endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1432 SSL_free(ssl); 1433 ssl = NULL; 1434 } 1435 return ret; 1436 } 1437 1438 # if !TLS_NO_RSA 1439 /* 1440 ** TMP_RSA_KEY -- return temporary RSA key 1441 ** 1442 ** Parameters: 1443 ** s -- TLS connection structure 1444 ** export -- 1445 ** keylength -- 1446 ** 1447 ** Returns: 1448 ** temporary RSA key. 1449 */ 1450 1451 # ifndef MAX_RSA_TMP_CNT 1452 # define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1453 # endif /* ! MAX_RSA_TMP_CNT */ 1454 1455 /* ARGUSED0 */ 1456 static RSA * 1457 tmp_rsa_key(s, export, keylength) 1458 SSL *s; 1459 int export; 1460 int keylength; 1461 { 1462 # if SM_CONF_SHM 1463 extern int ShmId; 1464 extern int *PRSATmpCnt; 1465 1466 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1467 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1468 return rsa_tmp; 1469 # endif /* SM_CONF_SHM */ 1470 1471 if (rsa_tmp != NULL) 1472 RSA_free(rsa_tmp); 1473 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL); 1474 if (rsa_tmp == NULL) 1475 { 1476 if (LogLevel > 0) 1477 sm_syslog(LOG_ERR, NOQID, 1478 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1479 } 1480 else 1481 { 1482 # if SM_CONF_SHM 1483 # if 0 1484 /* 1485 ** XXX we can't (yet) share the new key... 1486 ** The RSA structure contains pointers hence it can't be 1487 ** easily kept in shared memory. It must be transformed 1488 ** into a continous memory region first, then stored, 1489 ** and later read out again (each time re-transformed). 1490 */ 1491 1492 if (ShmId != SM_SHM_NO_ID) 1493 *PRSATmpCnt = 0; 1494 # endif /* 0 */ 1495 # endif /* SM_CONF_SHM */ 1496 if (LogLevel > 9) 1497 sm_syslog(LOG_ERR, NOQID, 1498 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1499 } 1500 return rsa_tmp; 1501 } 1502 # endif /* !TLS_NO_RSA */ 1503 /* 1504 ** APPS_SSL_INFO_CB -- info callback for TLS connections 1505 ** 1506 ** Parameters: 1507 ** s -- TLS connection structure 1508 ** where -- state in handshake 1509 ** ret -- return code of last operation 1510 ** 1511 ** Returns: 1512 ** none. 1513 */ 1514 1515 static void 1516 apps_ssl_info_cb(s, where, ret) 1517 CONST097 SSL *s; 1518 int where; 1519 int ret; 1520 { 1521 int w; 1522 char *str; 1523 BIO *bio_err = NULL; 1524 1525 if (LogLevel > 14) 1526 sm_syslog(LOG_INFO, NOQID, 1527 "STARTTLS: info_callback where=0x%x, ret=%d", 1528 where, ret); 1529 1530 w = where & ~SSL_ST_MASK; 1531 if (bio_err == NULL) 1532 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1533 1534 if (bitset(SSL_ST_CONNECT, w)) 1535 str = "SSL_connect"; 1536 else if (bitset(SSL_ST_ACCEPT, w)) 1537 str = "SSL_accept"; 1538 else 1539 str = "undefined"; 1540 1541 if (bitset(SSL_CB_LOOP, where)) 1542 { 1543 if (LogLevel > 12) 1544 sm_syslog(LOG_NOTICE, NOQID, 1545 "STARTTLS: %s:%s", 1546 str, SSL_state_string_long(s)); 1547 } 1548 else if (bitset(SSL_CB_ALERT, where)) 1549 { 1550 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1551 if (LogLevel > 12) 1552 sm_syslog(LOG_NOTICE, NOQID, 1553 "STARTTLS: SSL3 alert %s:%s:%s", 1554 str, SSL_alert_type_string_long(ret), 1555 SSL_alert_desc_string_long(ret)); 1556 } 1557 else if (bitset(SSL_CB_EXIT, where)) 1558 { 1559 if (ret == 0) 1560 { 1561 if (LogLevel > 7) 1562 sm_syslog(LOG_WARNING, NOQID, 1563 "STARTTLS: %s:failed in %s", 1564 str, SSL_state_string_long(s)); 1565 } 1566 else if (ret < 0) 1567 { 1568 if (LogLevel > 7) 1569 sm_syslog(LOG_WARNING, NOQID, 1570 "STARTTLS: %s:error in %s", 1571 str, SSL_state_string_long(s)); 1572 } 1573 } 1574 } 1575 /* 1576 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 1577 ** 1578 ** Parameters: 1579 ** ok -- verify ok? 1580 ** ctx -- x509 context 1581 ** 1582 ** Returns: 1583 ** 0 -- fatal error 1584 ** 1 -- ok 1585 */ 1586 1587 static int 1588 tls_verify_log(ok, ctx, name) 1589 int ok; 1590 X509_STORE_CTX *ctx; 1591 char *name; 1592 { 1593 SSL *ssl; 1594 X509 *cert; 1595 int reason, depth; 1596 char buf[512]; 1597 1598 cert = X509_STORE_CTX_get_current_cert(ctx); 1599 reason = X509_STORE_CTX_get_error(ctx); 1600 depth = X509_STORE_CTX_get_error_depth(ctx); 1601 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx, 1602 SSL_get_ex_data_X509_STORE_CTX_idx()); 1603 1604 if (ssl == NULL) 1605 { 1606 /* internal error */ 1607 sm_syslog(LOG_ERR, NOQID, 1608 "STARTTLS: internal error: tls_verify_cb: ssl == NULL"); 1609 return 0; 1610 } 1611 1612 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf)); 1613 sm_syslog(LOG_INFO, NOQID, 1614 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s", 1615 name, depth, buf, ok, X509_verify_cert_error_string(reason)); 1616 return 1; 1617 } 1618 1619 /* 1620 ** TLS_VERIFY_CB -- verify callback for TLS certificates 1621 ** 1622 ** Parameters: 1623 ** ctx -- x509 context 1624 ** 1625 ** Returns: 1626 ** accept connection? 1627 ** currently: always yes. 1628 */ 1629 1630 static int 1631 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1632 tls_verify_cb(ctx) 1633 X509_STORE_CTX *ctx; 1634 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1635 tls_verify_cb(ctx, unused) 1636 X509_STORE_CTX *ctx; 1637 void *unused; 1638 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1639 { 1640 int ok; 1641 1642 /* 1643 ** man SSL_CTX_set_cert_verify_callback(): 1644 ** callback should return 1 to indicate verification success 1645 ** and 0 to indicate verification failure. 1646 */ 1647 1648 ok = X509_verify_cert(ctx); 1649 if (ok <= 0) 1650 { 1651 if (LogLevel > 13) 1652 return tls_verify_log(ok, ctx, "TLS"); 1653 } 1654 return 1; 1655 } 1656 /* 1657 ** TLSLOGERR -- log the errors from the TLS error stack 1658 ** 1659 ** Parameters: 1660 ** who -- server/client (for logging). 1661 ** 1662 ** Returns: 1663 ** none. 1664 */ 1665 1666 void 1667 tlslogerr(who) 1668 const char *who; 1669 { 1670 unsigned long l; 1671 int line, flags; 1672 unsigned long es; 1673 char *file, *data; 1674 char buf[256]; 1675 # define CP (const char **) 1676 1677 es = CRYPTO_thread_id(); 1678 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags)) 1679 != 0) 1680 { 1681 sm_syslog(LOG_WARNING, NOQID, 1682 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 1683 ERR_error_string(l, buf), 1684 file, line, 1685 bitset(ERR_TXT_STRING, flags) ? data : ""); 1686 } 1687 } 1688 1689 # if OPENSSL_VERSION_NUMBER > 0x00907000L 1690 /* 1691 ** X509_VERIFY_CB -- verify callback 1692 ** 1693 ** Parameters: 1694 ** ctx -- x509 context 1695 ** 1696 ** Returns: 1697 ** accept connection? 1698 ** currently: always yes. 1699 */ 1700 1701 static int 1702 x509_verify_cb(ok, ctx) 1703 int ok; 1704 X509_STORE_CTX *ctx; 1705 { 1706 if (ok == 0) 1707 { 1708 if (LogLevel > 13) 1709 tls_verify_log(ok, ctx, "x509"); 1710 if (ctx->error == X509_V_ERR_UNABLE_TO_GET_CRL) 1711 { 1712 ctx->error = 0; 1713 return 1; /* override it */ 1714 } 1715 } 1716 return ok; 1717 } 1718 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 1719 #endif /* STARTTLS */ 1720