1 /* 2 * Copyright (c) 2000-2003 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 8.79.4.2 2003/01/23 23:16:24 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 !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 33 # define CONST097 34 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 35 # define CONST097 const 36 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 37 static void apps_ssl_info_cb __P((CONST097 SSL *, int , int)); 38 39 # if !NO_DH 40 static DH *get_dh512 __P((void)); 41 42 static unsigned char dh512_p[] = 43 { 44 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75, 45 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F, 46 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3, 47 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12, 48 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C, 49 0x47,0x74,0xE8,0x33 50 }; 51 static unsigned char dh512_g[] = 52 { 53 0x02 54 }; 55 56 static DH * 57 get_dh512() 58 { 59 DH *dh = NULL; 60 61 if ((dh = DH_new()) == NULL) 62 return NULL; 63 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 64 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 65 if ((dh->p == NULL) || (dh->g == NULL)) 66 return NULL; 67 return dh; 68 } 69 # endif /* !NO_DH */ 70 71 72 /* 73 ** TLS_RAND_INIT -- initialize STARTTLS random generator 74 ** 75 ** Parameters: 76 ** randfile -- name of file with random data 77 ** logl -- loglevel 78 ** 79 ** Returns: 80 ** success/failure 81 ** 82 ** Side Effects: 83 ** initializes PRNG for tls library. 84 */ 85 86 # define MIN_RAND_BYTES 128 /* 1024 bits */ 87 88 # define RF_OK 0 /* randfile OK */ 89 # define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 90 # define RF_UNKNOWN 2 /* unknown prefix for randfile */ 91 92 # define RI_NONE 0 /* no init yet */ 93 # define RI_SUCCESS 1 /* init was successful */ 94 # define RI_FAIL 2 /* init failed */ 95 96 static bool tls_rand_init __P((char *, int)); 97 98 static bool 99 tls_rand_init(randfile, logl) 100 char *randfile; 101 int logl; 102 { 103 # ifndef HASURANDOMDEV 104 /* not required if /dev/urandom exists, OpenSSL does it internally */ 105 106 bool ok; 107 int randdef; 108 static int done = RI_NONE; 109 110 /* 111 ** initialize PRNG 112 */ 113 114 /* did we try this before? if yes: return old value */ 115 if (done != RI_NONE) 116 return done == RI_SUCCESS; 117 118 /* set default values */ 119 ok = false; 120 done = RI_FAIL; 121 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 122 # if EGD 123 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 124 { 125 randfile += 4; 126 if (RAND_egd(randfile) < 0) 127 { 128 sm_syslog(LOG_WARNING, NOQID, 129 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 130 randfile); 131 } 132 else 133 ok = true; 134 } 135 else 136 # endif /* EGD */ 137 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 138 { 139 int fd; 140 long sff; 141 struct stat st; 142 143 randfile += 5; 144 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 145 | SFF_NOGWFILES | SFF_NOWWFILES 146 | SFF_NOGRFILES | SFF_NOWRFILES 147 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 148 if (DontLockReadFiles) 149 sff |= SFF_NOLOCK; 150 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 151 { 152 if (fstat(fd, &st) < 0) 153 { 154 if (LogLevel > logl) 155 sm_syslog(LOG_ERR, NOQID, 156 "STARTTLS: can't fstat(%s)", 157 randfile); 158 } 159 else 160 { 161 bool use, problem; 162 163 use = true; 164 problem = false; 165 166 /* max. age of file: 10 minutes */ 167 if (st.st_mtime + 600 < curtime()) 168 { 169 use = bitnset(DBS_INSUFFICIENTENTROPY, 170 DontBlameSendmail); 171 problem = true; 172 if (LogLevel > logl) 173 sm_syslog(LOG_ERR, NOQID, 174 "STARTTLS: RandFile %s too old: %s", 175 randfile, 176 use ? "unsafe" : 177 "unusable"); 178 } 179 if (use && st.st_size < MIN_RAND_BYTES) 180 { 181 use = bitnset(DBS_INSUFFICIENTENTROPY, 182 DontBlameSendmail); 183 problem = true; 184 if (LogLevel > logl) 185 sm_syslog(LOG_ERR, NOQID, 186 "STARTTLS: size(%s) < %d: %s", 187 randfile, 188 MIN_RAND_BYTES, 189 use ? "unsafe" : 190 "unusable"); 191 } 192 if (use) 193 ok = RAND_load_file(randfile, -1) >= 194 MIN_RAND_BYTES; 195 if (use && !ok) 196 { 197 if (LogLevel > logl) 198 sm_syslog(LOG_WARNING, NOQID, 199 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 200 randfile); 201 } 202 if (problem) 203 ok = false; 204 } 205 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 206 DontBlameSendmail)) 207 { 208 /* add this even if fstat() failed */ 209 RAND_seed((void *) &st, sizeof st); 210 } 211 (void) close(fd); 212 } 213 else 214 { 215 if (LogLevel > logl) 216 sm_syslog(LOG_WARNING, NOQID, 217 "STARTTLS: Warning: safeopen(%s) failed", 218 randfile); 219 } 220 } 221 else if (randdef == RF_OK) 222 { 223 if (LogLevel > logl) 224 sm_syslog(LOG_WARNING, NOQID, 225 "STARTTLS: Error: no proper random file definition %s", 226 randfile); 227 randdef = RF_UNKNOWN; 228 } 229 if (randdef == RF_MISS) 230 { 231 if (LogLevel > logl) 232 sm_syslog(LOG_WARNING, NOQID, 233 "STARTTLS: Error: missing random file definition"); 234 } 235 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 236 { 237 int i; 238 long r; 239 unsigned char buf[MIN_RAND_BYTES]; 240 241 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 242 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 243 { 244 r = get_random(); 245 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 246 } 247 RAND_seed(buf, sizeof buf); 248 if (LogLevel > logl) 249 sm_syslog(LOG_WARNING, NOQID, 250 "STARTTLS: Warning: random number generator not properly seeded"); 251 ok = true; 252 } 253 done = ok ? RI_SUCCESS : RI_FAIL; 254 return ok; 255 # else /* ! HASURANDOMDEV */ 256 return true; 257 # endif /* ! HASURANDOMDEV */ 258 } 259 /* 260 ** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 261 ** 262 ** Parameters: 263 ** none. 264 ** 265 ** Returns: 266 ** succeeded? 267 */ 268 269 bool 270 init_tls_library() 271 { 272 /* basic TLS initialization, ignore result for now */ 273 SSL_library_init(); 274 SSL_load_error_strings(); 275 # if 0 276 /* this is currently a macro for SSL_library_init */ 277 SSLeay_add_ssl_algorithms(); 278 # endif /* 0 */ 279 280 return tls_rand_init(RandFile, 7); 281 } 282 /* 283 ** TLS_SET_VERIFY -- request client certificate? 284 ** 285 ** Parameters: 286 ** ctx -- TLS context 287 ** ssl -- TLS structure 288 ** vrfy -- require certificate? 289 ** 290 ** Returns: 291 ** none. 292 ** 293 ** Side Effects: 294 ** Sets verification state for TLS 295 ** 296 # if TLS_VRFY_PER_CTX 297 ** Notice: 298 ** This is per TLS context, not per TLS structure; 299 ** the former is global, the latter per connection. 300 ** It would be nice to do this per connection, but this 301 ** doesn't work in the current TLS libraries :-( 302 # endif * TLS_VRFY_PER_CTX * 303 */ 304 305 void 306 tls_set_verify(ctx, ssl, vrfy) 307 SSL_CTX *ctx; 308 SSL *ssl; 309 bool vrfy; 310 { 311 # if !TLS_VRFY_PER_CTX 312 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 313 # else /* !TLS_VRFY_PER_CTX */ 314 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 315 NULL); 316 # endif /* !TLS_VRFY_PER_CTX */ 317 } 318 319 /* 320 ** status in initialization 321 ** these flags keep track of the status of the initialization 322 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 323 ** [due to permissions] 324 */ 325 326 # define TLS_S_NONE 0x00000000 /* none yet */ 327 # define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 328 # define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 329 # define TLS_S_KEY_EX 0x00000004 /* key file exists */ 330 # define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 331 # define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 332 # define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 333 # define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 334 # define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 335 336 # if _FFR_TLS_1 337 # define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 338 # define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 339 # define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 340 # define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 341 # endif /* _FFR_TLS_1 */ 342 343 # define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 344 # define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 345 # define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 346 347 /* 348 ** TLS_OK_F -- can var be an absolute filename? 349 ** 350 ** Parameters: 351 ** var -- filename 352 ** fn -- what is the filename used for? 353 ** srv -- server side? 354 ** 355 ** Returns: 356 ** ok? 357 */ 358 359 static bool 360 tls_ok_f(var, fn, srv) 361 char *var; 362 char *fn; 363 bool srv; 364 { 365 /* must be absolute pathname */ 366 if (var != NULL && *var == '/') 367 return true; 368 if (LogLevel > 12) 369 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 370 srv ? "Server" : "Client", fn); 371 return false; 372 } 373 /* 374 ** TLS_SAFE_F -- is a file safe to use? 375 ** 376 ** Parameters: 377 ** var -- filename 378 ** sff -- flags for safefile() 379 ** srv -- server side? 380 ** 381 ** Returns: 382 ** ok? 383 */ 384 385 static bool 386 tls_safe_f(var, sff, srv) 387 char *var; 388 long sff; 389 bool srv; 390 { 391 int ret; 392 393 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 394 S_IRUSR, NULL)) == 0) 395 return true; 396 if (LogLevel > 7) 397 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 398 srv ? "server" : "client", var, sm_errstring(ret)); 399 return false; 400 } 401 402 /* 403 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 404 ** 405 ** Parameters: 406 ** var -- filename 407 ** fn -- what is the filename used for? 408 ** req -- is the file required? 409 ** st -- status bit to set if ok 410 ** srv -- server side? 411 ** 412 ** Side Effects: 413 ** uses r, ok; may change ok and status. 414 ** 415 */ 416 417 # define TLS_OK_F(var, fn, req, st, srv) if (ok) \ 418 { \ 419 r = tls_ok_f(var, fn, srv); \ 420 if (r) \ 421 status |= st; \ 422 else if (req) \ 423 ok = false; \ 424 } 425 426 /* 427 ** TLS_UNR -- macro to return whether a file should be unreadable 428 ** 429 ** Parameters: 430 ** bit -- flag to test 431 ** req -- flags 432 ** 433 ** Returns: 434 ** 0/SFF_NORFILES 435 */ 436 # define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 437 # define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 438 # define TLS_KEYSFF(req) \ 439 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 440 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 441 TLS_UNR(TLS_I_KEY_UNR, req)) 442 443 /* 444 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 445 ** 446 ** Parameters: 447 ** var -- filename 448 ** sff -- flags for safefile() 449 ** req -- is the file required? 450 ** ex -- does the file exist? 451 ** st -- status bit to set if ok 452 ** srv -- server side? 453 ** 454 ** Side Effects: 455 ** uses r, ok, ex; may change ok and status. 456 ** 457 */ 458 459 # define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 460 { \ 461 r = tls_safe_f(var, sff, srv); \ 462 if (r) \ 463 status |= st; \ 464 else if (req) \ 465 ok = false; \ 466 } 467 468 /* 469 ** INITTLS -- initialize TLS 470 ** 471 ** Parameters: 472 ** ctx -- pointer to context 473 ** req -- requirements for initialization (see sendmail.h) 474 ** srv -- server side? 475 ** certfile -- filename of certificate 476 ** keyfile -- filename of private key 477 ** cacertpath -- path to CAs 478 ** cacertfile -- file with CA(s) 479 ** dhparam -- parameters for DH 480 ** 481 ** Returns: 482 ** succeeded? 483 */ 484 485 bool 486 inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 487 SSL_CTX **ctx; 488 unsigned long req; 489 bool srv; 490 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 491 { 492 # if !NO_DH 493 static DH *dh = NULL; 494 # endif /* !NO_DH */ 495 int r; 496 bool ok; 497 long sff, status; 498 char *who; 499 # if _FFR_TLS_1 500 char *cf2, *kf2; 501 # endif /* _FFR_TLS_1 */ 502 # if SM_CONF_SHM 503 extern int ShmId; 504 # endif /* SM_CONF_SHM */ 505 506 status = TLS_S_NONE; 507 who = srv ? "server" : "client"; 508 if (ctx == NULL) 509 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 510 511 /* already initialized? (we could re-init...) */ 512 if (*ctx != NULL) 513 return true; 514 ok = true; 515 516 # if _FFR_TLS_1 517 /* 518 ** look for a second filename: it must be separated by a ',' 519 ** no blanks allowed (they won't be skipped). 520 ** we change a global variable here! this change will be undone 521 ** before return from the function but only if it returns true. 522 ** this isn't a problem since in a failure case this function 523 ** won't be called again with the same (overwritten) values. 524 ** otherwise each return must be replaced with a goto endinittls. 525 */ 526 527 cf2 = NULL; 528 kf2 = NULL; 529 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 530 { 531 *cf2++ = '\0'; 532 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 533 *kf2++ = '\0'; 534 } 535 # endif /* _FFR_TLS_1 */ 536 537 /* 538 ** Check whether files/paths are defined 539 */ 540 541 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 542 TLS_S_CERT_EX, srv); 543 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 544 TLS_S_KEY_EX, srv); 545 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 546 TLS_S_CERTP_EX, srv); 547 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 548 TLS_S_CERTF_EX, srv); 549 550 # if _FFR_TLS_1 551 /* 552 ** if the second file is specified it must exist 553 ** XXX: it is possible here to define only one of those files 554 */ 555 556 if (cf2 != NULL) 557 { 558 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 559 TLS_S_CERT2_EX, srv); 560 } 561 if (kf2 != NULL) 562 { 563 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 564 TLS_S_KEY2_EX, srv); 565 } 566 # endif /* _FFR_TLS_1 */ 567 568 /* 569 ** valid values for dhparam are (only the first char is checked) 570 ** none no parameters: don't use DH 571 ** 512 generate 512 bit parameters (fixed) 572 ** 1024 generate 1024 bit parameters 573 ** /file/name read parameters from /file/name 574 ** default is: 1024 for server, 512 for client (OK? XXX) 575 */ 576 577 if (bitset(TLS_I_TRY_DH, req)) 578 { 579 if (dhparam != NULL) 580 { 581 char c = *dhparam; 582 583 if (c == '1') 584 req |= TLS_I_DH1024; 585 else if (c == '5') 586 req |= TLS_I_DH512; 587 else if (c != 'n' && c != 'N' && c != '/') 588 { 589 if (LogLevel > 12) 590 sm_syslog(LOG_WARNING, NOQID, 591 "STARTTLS=%s, error: illegal value '%s' for DHParam", 592 who, dhparam); 593 dhparam = NULL; 594 } 595 } 596 if (dhparam == NULL) 597 dhparam = srv ? "1" : "5"; 598 else if (*dhparam == '/') 599 { 600 TLS_OK_F(dhparam, "DHParameters", 601 bitset(TLS_I_DHPAR_EX, req), 602 TLS_S_DHPAR_EX, srv); 603 } 604 } 605 if (!ok) 606 return ok; 607 608 /* certfile etc. must be "safe". */ 609 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 610 | SFF_NOGWFILES | SFF_NOWWFILES 611 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 612 if (DontLockReadFiles) 613 sff |= SFF_NOLOCK; 614 615 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 616 bitset(TLS_I_CERT_EX, req), 617 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 618 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 619 bitset(TLS_I_KEY_EX, req), 620 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 621 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 622 bitset(TLS_I_CERTF_EX, req), 623 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 624 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 625 bitset(TLS_I_DHPAR_EX, req), 626 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 627 if (!ok) 628 return ok; 629 # if _FFR_TLS_1 630 if (cf2 != NULL) 631 { 632 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 633 bitset(TLS_I_CERT_EX, req), 634 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 635 } 636 if (kf2 != NULL) 637 { 638 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 639 bitset(TLS_I_KEY_EX, req), 640 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 641 } 642 # endif /* _FFR_TLS_1 */ 643 644 /* create a method and a new context */ 645 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 646 SSLv23_client_method())) == NULL) 647 { 648 if (LogLevel > 7) 649 sm_syslog(LOG_WARNING, NOQID, 650 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 651 who, who); 652 if (LogLevel > 9) 653 tlslogerr(who); 654 return false; 655 } 656 657 # if TLS_NO_RSA 658 /* turn off backward compatibility, required for no-rsa */ 659 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 660 # endif /* TLS_NO_RSA */ 661 662 663 # if !TLS_NO_RSA 664 /* 665 ** Create a temporary RSA key 666 ** XXX Maybe we shouldn't create this always (even though it 667 ** is only at startup). 668 ** It is a time-consuming operation and it is not always necessary. 669 ** maybe we should do it only on demand... 670 */ 671 672 if (bitset(TLS_I_RSA_TMP, req) 673 # if SM_CONF_SHM 674 && ShmId != SM_SHM_NO_ID && 675 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 676 NULL)) == NULL 677 # else /* SM_CONF_SHM */ 678 && 0 /* no shared memory: no need to generate key now */ 679 # endif /* SM_CONF_SHM */ 680 ) 681 { 682 if (LogLevel > 7) 683 { 684 sm_syslog(LOG_WARNING, NOQID, 685 "STARTTLS=%s, error: RSA_generate_key failed", 686 who); 687 if (LogLevel > 9) 688 tlslogerr(who); 689 } 690 return false; 691 } 692 # endif /* !TLS_NO_RSA */ 693 694 /* 695 ** load private key 696 ** XXX change this for DSA-only version 697 */ 698 699 if (bitset(TLS_S_KEY_OK, status) && 700 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 701 SSL_FILETYPE_PEM) <= 0) 702 { 703 if (LogLevel > 7) 704 { 705 sm_syslog(LOG_WARNING, NOQID, 706 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 707 who, keyfile); 708 if (LogLevel > 9) 709 tlslogerr(who); 710 } 711 if (bitset(TLS_I_USE_KEY, req)) 712 return false; 713 } 714 715 /* get the certificate file */ 716 if (bitset(TLS_S_CERT_OK, status) && 717 SSL_CTX_use_certificate_file(*ctx, certfile, 718 SSL_FILETYPE_PEM) <= 0) 719 { 720 if (LogLevel > 7) 721 { 722 sm_syslog(LOG_WARNING, NOQID, 723 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 724 who, certfile); 725 if (LogLevel > 9) 726 tlslogerr(who); 727 } 728 if (bitset(TLS_I_USE_CERT, req)) 729 return false; 730 } 731 732 /* check the private key */ 733 if (bitset(TLS_S_KEY_OK, status) && 734 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 735 { 736 /* Private key does not match the certificate public key */ 737 if (LogLevel > 5) 738 { 739 sm_syslog(LOG_WARNING, NOQID, 740 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 741 who, keyfile, r); 742 if (LogLevel > 9) 743 tlslogerr(who); 744 } 745 if (bitset(TLS_I_USE_KEY, req)) 746 return false; 747 } 748 749 # if _FFR_TLS_1 750 /* XXX this code is pretty much duplicated from above! */ 751 752 /* load private key */ 753 if (bitset(TLS_S_KEY2_OK, status) && 754 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 755 { 756 if (LogLevel > 7) 757 { 758 sm_syslog(LOG_WARNING, NOQID, 759 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 760 who, kf2); 761 if (LogLevel > 9) 762 tlslogerr(who); 763 } 764 } 765 766 /* get the certificate file */ 767 if (bitset(TLS_S_CERT2_OK, status) && 768 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0) 769 { 770 if (LogLevel > 7) 771 { 772 sm_syslog(LOG_WARNING, NOQID, 773 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 774 who, cf2); 775 if (LogLevel > 9) 776 tlslogerr(who); 777 } 778 } 779 780 /* also check the private key */ 781 if (bitset(TLS_S_KEY2_OK, status) && 782 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 783 { 784 /* Private key does not match the certificate public key */ 785 if (LogLevel > 5) 786 { 787 sm_syslog(LOG_WARNING, NOQID, 788 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 789 who, r); 790 if (LogLevel > 9) 791 tlslogerr(who); 792 } 793 } 794 # endif /* _FFR_TLS_1 */ 795 796 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 797 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */ 798 799 # if !NO_DH 800 /* Diffie-Hellman initialization */ 801 if (bitset(TLS_I_TRY_DH, req)) 802 { 803 if (bitset(TLS_S_DHPAR_OK, status)) 804 { 805 BIO *bio; 806 807 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 808 { 809 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 810 BIO_free(bio); 811 if (dh == NULL && LogLevel > 7) 812 { 813 unsigned long err; 814 815 err = ERR_get_error(); 816 sm_syslog(LOG_WARNING, NOQID, 817 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 818 who, dhparam, 819 ERR_error_string(err, NULL)); 820 if (LogLevel > 9) 821 tlslogerr(who); 822 } 823 } 824 else 825 { 826 if (LogLevel > 5) 827 { 828 sm_syslog(LOG_WARNING, NOQID, 829 "STARTTLS=%s, error: BIO_new_file(%s) failed", 830 who, dhparam); 831 if (LogLevel > 9) 832 tlslogerr(who); 833 } 834 } 835 } 836 if (dh == NULL && bitset(TLS_I_DH1024, req)) 837 { 838 DSA *dsa; 839 840 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */ 841 dsa = DSA_generate_parameters(1024, NULL, 0, NULL, 842 NULL, 0, NULL); 843 dh = DSA_dup_DH(dsa); 844 DSA_free(dsa); 845 } 846 else 847 if (dh == NULL && bitset(TLS_I_DH512, req)) 848 dh = get_dh512(); 849 850 if (dh == NULL) 851 { 852 if (LogLevel > 9) 853 { 854 unsigned long err; 855 856 err = ERR_get_error(); 857 sm_syslog(LOG_WARNING, NOQID, 858 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 859 who, dhparam, 860 ERR_error_string(err, NULL)); 861 } 862 if (bitset(TLS_I_REQ_DH, req)) 863 return false; 864 } 865 else 866 { 867 SSL_CTX_set_tmp_dh(*ctx, dh); 868 869 /* important to avoid small subgroup attacks */ 870 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 871 if (LogLevel > 13) 872 sm_syslog(LOG_INFO, NOQID, 873 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 874 who, 8 * DH_size(dh), *dhparam); 875 DH_free(dh); 876 } 877 } 878 # endif /* !NO_DH */ 879 880 881 /* XXX do we need this cache here? */ 882 if (bitset(TLS_I_CACHE, req)) 883 SSL_CTX_sess_set_cache_size(*ctx, 128); 884 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */ 885 886 /* load certificate locations and default CA paths */ 887 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 888 { 889 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 890 cacertpath)) == 1) 891 { 892 # if !TLS_NO_RSA 893 if (bitset(TLS_I_RSA_TMP, req)) 894 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 895 # endif /* !TLS_NO_RSA */ 896 897 /* 898 ** We have to install our own verify callback: 899 ** SSL_VERIFY_PEER requests a client cert but even 900 ** though *FAIL_IF* isn't set, the connection 901 ** will be aborted if the client presents a cert 902 ** that is not "liked" (can't be verified?) by 903 ** the TLS library :-( 904 */ 905 906 /* 907 ** XXX currently we could call tls_set_verify() 908 ** but we hope that that function will later on 909 ** only set the mode per connection. 910 */ 911 SSL_CTX_set_verify(*ctx, 912 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 913 : SSL_VERIFY_PEER, 914 NULL); 915 916 /* install verify callback */ 917 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 918 NULL); 919 SSL_CTX_set_client_CA_list(*ctx, 920 SSL_load_client_CA_file(cacertfile)); 921 } 922 else 923 { 924 /* 925 ** can't load CA data; do we care? 926 ** the data is necessary to authenticate the client, 927 ** which in turn would be necessary 928 ** if we want to allow relaying based on it. 929 */ 930 if (LogLevel > 5) 931 { 932 sm_syslog(LOG_WARNING, NOQID, 933 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 934 who, cacertpath, cacertfile, r); 935 if (LogLevel > 9) 936 tlslogerr(who); 937 } 938 if (bitset(TLS_I_VRFY_LOC, req)) 939 return false; 940 } 941 } 942 943 /* XXX: make this dependent on an option? */ 944 if (tTd(96, 9)) 945 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 946 947 # if _FFR_TLS_1 948 /* install our own cipher list */ 949 if (CipherList != NULL && *CipherList != '\0') 950 { 951 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 952 { 953 if (LogLevel > 7) 954 { 955 sm_syslog(LOG_WARNING, NOQID, 956 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 957 who, CipherList); 958 959 if (LogLevel > 9) 960 tlslogerr(who); 961 } 962 /* failure if setting to this list is required? */ 963 } 964 } 965 # endif /* _FFR_TLS_1 */ 966 if (LogLevel > 12) 967 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 968 969 # if _FFR_TLS_1 970 # if 0 971 /* 972 ** this label is required if we want to have a "clean" exit 973 ** see the comments above at the initialization of cf2 974 */ 975 976 endinittls: 977 # endif /* 0 */ 978 979 /* undo damage to global variables */ 980 if (cf2 != NULL) 981 *--cf2 = ','; 982 if (kf2 != NULL) 983 *--kf2 = ','; 984 # endif /* _FFR_TLS_1 */ 985 986 return ok; 987 } 988 /* 989 ** TLS_GET_INFO -- get information about TLS connection 990 ** 991 ** Parameters: 992 ** ssl -- TLS connection structure 993 ** srv -- server or client 994 ** host -- hostname of other side 995 ** mac -- macro storage 996 ** certreq -- did we ask for a cert? 997 ** 998 ** Returns: 999 ** result of authentication. 1000 ** 1001 ** Side Effects: 1002 ** sets macros: {cipher}, {tls_version}, {verify}, 1003 ** {cipher_bits}, {alg_bits}, {cert}, {cert_subject}, 1004 ** {cert_issuer}, {cn_subject}, {cn_issuer} 1005 */ 1006 1007 int 1008 tls_get_info(ssl, srv, host, mac, certreq) 1009 SSL *ssl; 1010 bool srv; 1011 char *host; 1012 MACROS_T *mac; 1013 bool certreq; 1014 { 1015 SSL_CIPHER *c; 1016 int b, r; 1017 char *s, *who; 1018 char bitstr[16]; 1019 X509 *cert; 1020 1021 c = SSL_get_current_cipher(ssl); 1022 1023 /* cast is just workaround for compiler warning */ 1024 macdefine(mac, A_TEMP, macid("{cipher}"), 1025 (char *) SSL_CIPHER_get_name(c)); 1026 b = SSL_CIPHER_get_bits(c, &r); 1027 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", b); 1028 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1029 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", r); 1030 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1031 s = SSL_CIPHER_get_version(c); 1032 if (s == NULL) 1033 s = "UNKNOWN"; 1034 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1035 1036 who = srv ? "server" : "client"; 1037 cert = SSL_get_peer_certificate(ssl); 1038 if (LogLevel > 14) 1039 sm_syslog(LOG_INFO, NOQID, 1040 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1041 who, SSL_get_verify_result(ssl), 1042 (unsigned long) cert); 1043 if (cert != NULL) 1044 { 1045 unsigned int n; 1046 unsigned char md[EVP_MAX_MD_SIZE]; 1047 char buf[MAXNAME]; 1048 1049 X509_NAME_oneline(X509_get_subject_name(cert), 1050 buf, sizeof buf); 1051 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1052 xtextify(buf, "<>\")")); 1053 X509_NAME_oneline(X509_get_issuer_name(cert), 1054 buf, sizeof buf); 1055 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1056 xtextify(buf, "<>\")")); 1057 X509_NAME_get_text_by_NID(X509_get_subject_name(cert), 1058 NID_commonName, buf, sizeof buf); 1059 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1060 xtextify(buf, "<>\")")); 1061 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert), 1062 NID_commonName, buf, sizeof buf); 1063 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1064 xtextify(buf, "<>\")")); 1065 if (X509_digest(cert, EVP_md5(), md, &n)) 1066 { 1067 char md5h[EVP_MAX_MD_SIZE * 3]; 1068 static const char hexcodes[] = "0123456789ABCDEF"; 1069 1070 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1071 for (r = 0; r < (int) n; r++) 1072 { 1073 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1074 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1075 md5h[(r * 3) + 2] = ':'; 1076 } 1077 md5h[(n * 3) - 1] = '\0'; 1078 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h); 1079 } 1080 else 1081 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1082 } 1083 else 1084 { 1085 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1086 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1087 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1088 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1089 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1090 } 1091 switch (SSL_get_verify_result(ssl)) 1092 { 1093 case X509_V_OK: 1094 if (cert != NULL) 1095 { 1096 s = "OK"; 1097 r = TLS_AUTH_OK; 1098 } 1099 else 1100 { 1101 s = certreq ? "NO" : "NOT", 1102 r = TLS_AUTH_NO; 1103 } 1104 break; 1105 default: 1106 s = "FAIL"; 1107 r = TLS_AUTH_FAIL; 1108 break; 1109 } 1110 macdefine(mac, A_PERM, macid("{verify}"), s); 1111 if (cert != NULL) 1112 X509_free(cert); 1113 1114 /* do some logging */ 1115 if (LogLevel > 8) 1116 { 1117 char *vers, *s1, *s2, *cbits, *algbits; 1118 1119 vers = macget(mac, macid("{tls_version}")); 1120 cbits = macget(mac, macid("{cipher_bits}")); 1121 algbits = macget(mac, macid("{alg_bits}")); 1122 s1 = macget(mac, macid("{verify}")); 1123 s2 = macget(mac, macid("{cipher}")); 1124 1125 /* XXX: maybe cut off ident info? */ 1126 sm_syslog(LOG_INFO, NOQID, 1127 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1128 who, 1129 host == NULL ? "local" : host, 1130 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1131 algbits == NULL ? "0" : algbits, 1132 cbits == NULL ? "0" : cbits); 1133 if (LogLevel > 11) 1134 { 1135 /* 1136 ** Maybe run xuntextify on the strings? 1137 ** That is easier to read but makes it maybe a bit 1138 ** more complicated to figure out the right values 1139 ** for the access map... 1140 */ 1141 1142 s1 = macget(mac, macid("{cert_subject}")); 1143 s2 = macget(mac, macid("{cert_issuer}")); 1144 sm_syslog(LOG_INFO, NOQID, 1145 "STARTTLS=%s, cert-subject=%.128s, cert-issuer=%.128s", 1146 who, s1, s2); 1147 } 1148 } 1149 return r; 1150 } 1151 /* 1152 ** ENDTLS -- shutdown secure connection 1153 ** 1154 ** Parameters: 1155 ** ssl -- SSL connection information. 1156 ** side -- server/client (for logging). 1157 ** 1158 ** Returns: 1159 ** success? (EX_* code) 1160 */ 1161 1162 int 1163 endtls(ssl, side) 1164 SSL *ssl; 1165 char *side; 1166 { 1167 int ret = EX_OK; 1168 1169 if (ssl != NULL) 1170 { 1171 int r; 1172 1173 if ((r = SSL_shutdown(ssl)) < 0) 1174 { 1175 if (LogLevel > 11) 1176 { 1177 sm_syslog(LOG_WARNING, NOQID, 1178 "STARTTLS=%s, SSL_shutdown failed: %d", 1179 side, r); 1180 tlslogerr(side); 1181 } 1182 ret = EX_SOFTWARE; 1183 } 1184 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1185 1186 /* 1187 ** Bug in OpenSSL (at least up to 0.9.6b): 1188 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1189 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1190 ** To: openssl-users@openssl.org 1191 ** Subject: Re: SSL_shutdown() woes (fwd) 1192 ** 1193 ** The side sending the shutdown alert first will 1194 ** not care about the answer of the peer but will 1195 ** immediately return with a return value of "0" 1196 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1197 ** the value of "0" and as the shutdown alert of the peer was 1198 ** not received (actually, the program did not even wait for 1199 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1200 ** is the default rule in case everything else does not apply. 1201 ** 1202 ** For your server the problem is different, because it 1203 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1204 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1205 ** server the shutdown was successfull. 1206 ** 1207 ** As is by know, you would have to call SSL_shutdown() once 1208 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1209 ** SSL_shutdown() again to actually get the server's response. 1210 ** 1211 ** In the last discussion, Bodo Moeller concluded that a 1212 ** rewrite of the shutdown code would be necessary, but 1213 ** probably with another API, as the change would not be 1214 ** compatible to the way it is now. Things do not become 1215 ** easier as other programs do not follow the shutdown 1216 ** guidelines anyway, so that a lot error conditions and 1217 ** compitibility issues would have to be caught. 1218 ** 1219 ** For now the recommondation is to ignore the error message. 1220 */ 1221 1222 else if (r == 0) 1223 { 1224 if (LogLevel > 15) 1225 { 1226 sm_syslog(LOG_WARNING, NOQID, 1227 "STARTTLS=%s, SSL_shutdown not done", 1228 side); 1229 tlslogerr(side); 1230 } 1231 ret = EX_SOFTWARE; 1232 } 1233 # endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1234 SSL_free(ssl); 1235 ssl = NULL; 1236 } 1237 return ret; 1238 } 1239 1240 # if !TLS_NO_RSA 1241 /* 1242 ** TMP_RSA_KEY -- return temporary RSA key 1243 ** 1244 ** Parameters: 1245 ** s -- TLS connection structure 1246 ** export -- 1247 ** keylength -- 1248 ** 1249 ** Returns: 1250 ** temporary RSA key. 1251 */ 1252 1253 # ifndef MAX_RSA_TMP_CNT 1254 # define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1255 # endif /* ! MAX_RSA_TMP_CNT */ 1256 1257 /* ARGUSED0 */ 1258 static RSA * 1259 tmp_rsa_key(s, export, keylength) 1260 SSL *s; 1261 int export; 1262 int keylength; 1263 { 1264 # if SM_CONF_SHM 1265 extern int ShmId; 1266 extern int *PRSATmpCnt; 1267 1268 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1269 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1270 return rsa_tmp; 1271 # endif /* SM_CONF_SHM */ 1272 1273 if (rsa_tmp != NULL) 1274 RSA_free(rsa_tmp); 1275 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL); 1276 if (rsa_tmp == NULL) 1277 { 1278 if (LogLevel > 0) 1279 sm_syslog(LOG_ERR, NOQID, 1280 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1281 } 1282 else 1283 { 1284 # if SM_CONF_SHM 1285 # if 0 1286 /* 1287 ** XXX we can't (yet) share the new key... 1288 ** The RSA structure contains pointers hence it can't be 1289 ** easily kept in shared memory. It must be transformed 1290 ** into a continous memory region first, then stored, 1291 ** and later read out again (each time re-transformed). 1292 */ 1293 1294 if (ShmId != SM_SHM_NO_ID) 1295 *PRSATmpCnt = 0; 1296 # endif /* 0 */ 1297 # endif /* SM_CONF_SHM */ 1298 if (LogLevel > 9) 1299 sm_syslog(LOG_ERR, NOQID, 1300 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1301 } 1302 return rsa_tmp; 1303 } 1304 # endif /* !TLS_NO_RSA */ 1305 /* 1306 ** APPS_SSL_INFO_CB -- info callback for TLS connections 1307 ** 1308 ** Parameters: 1309 ** s -- TLS connection structure 1310 ** where -- state in handshake 1311 ** ret -- return code of last operation 1312 ** 1313 ** Returns: 1314 ** none. 1315 */ 1316 1317 static void 1318 apps_ssl_info_cb(s, where, ret) 1319 CONST097 SSL *s; 1320 int where; 1321 int ret; 1322 { 1323 int w; 1324 char *str; 1325 BIO *bio_err = NULL; 1326 1327 if (LogLevel > 14) 1328 sm_syslog(LOG_INFO, NOQID, 1329 "STARTTLS: info_callback where=0x%x, ret=%d", 1330 where, ret); 1331 1332 w = where & ~SSL_ST_MASK; 1333 if (bio_err == NULL) 1334 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1335 1336 if (bitset(SSL_ST_CONNECT, w)) 1337 str = "SSL_connect"; 1338 else if (bitset(SSL_ST_ACCEPT, w)) 1339 str = "SSL_accept"; 1340 else 1341 str = "undefined"; 1342 1343 if (bitset(SSL_CB_LOOP, where)) 1344 { 1345 if (LogLevel > 12) 1346 sm_syslog(LOG_NOTICE, NOQID, 1347 "STARTTLS: %s:%s", 1348 str, SSL_state_string_long(s)); 1349 } 1350 else if (bitset(SSL_CB_ALERT, where)) 1351 { 1352 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1353 if (LogLevel > 12) 1354 sm_syslog(LOG_NOTICE, NOQID, 1355 "STARTTLS: SSL3 alert %s:%s:%s", 1356 str, SSL_alert_type_string_long(ret), 1357 SSL_alert_desc_string_long(ret)); 1358 } 1359 else if (bitset(SSL_CB_EXIT, where)) 1360 { 1361 if (ret == 0) 1362 { 1363 if (LogLevel > 7) 1364 sm_syslog(LOG_WARNING, NOQID, 1365 "STARTTLS: %s:failed in %s", 1366 str, SSL_state_string_long(s)); 1367 } 1368 else if (ret < 0) 1369 { 1370 if (LogLevel > 7) 1371 sm_syslog(LOG_WARNING, NOQID, 1372 "STARTTLS: %s:error in %s", 1373 str, SSL_state_string_long(s)); 1374 } 1375 } 1376 } 1377 /* 1378 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 1379 ** 1380 ** Parameters: 1381 ** ok -- verify ok? 1382 ** ctx -- x509 context 1383 ** 1384 ** Returns: 1385 ** 0 -- fatal error 1386 ** 1 -- ok 1387 */ 1388 1389 static int 1390 tls_verify_log(ok, ctx) 1391 int ok; 1392 X509_STORE_CTX *ctx; 1393 { 1394 SSL *ssl; 1395 X509 *cert; 1396 int reason, depth; 1397 char buf[512]; 1398 1399 cert = X509_STORE_CTX_get_current_cert(ctx); 1400 reason = X509_STORE_CTX_get_error(ctx); 1401 depth = X509_STORE_CTX_get_error_depth(ctx); 1402 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx, 1403 SSL_get_ex_data_X509_STORE_CTX_idx()); 1404 1405 if (ssl == NULL) 1406 { 1407 /* internal error */ 1408 sm_syslog(LOG_ERR, NOQID, 1409 "STARTTLS: internal error: tls_verify_cb: ssl == NULL"); 1410 return 0; 1411 } 1412 1413 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf); 1414 sm_syslog(LOG_INFO, NOQID, 1415 "STARTTLS: cert verify: depth=%d %s, state=%d, reason=%s", 1416 depth, buf, ok, X509_verify_cert_error_string(reason)); 1417 return 1; 1418 } 1419 /* 1420 ** TLS_VERIFY_CB -- verify callback for TLS certificates 1421 ** 1422 ** Parameters: 1423 ** ctx -- x509 context 1424 ** 1425 ** Returns: 1426 ** accept connection? 1427 ** currently: always yes. 1428 */ 1429 1430 static int 1431 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1432 tls_verify_cb(ctx) 1433 X509_STORE_CTX *ctx; 1434 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1435 tls_verify_cb(ctx, unused) 1436 X509_STORE_CTX *ctx; 1437 void *unused; 1438 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1439 { 1440 int ok; 1441 1442 ok = X509_verify_cert(ctx); 1443 if (ok == 0) 1444 { 1445 if (LogLevel > 13) 1446 return tls_verify_log(ok, ctx); 1447 return 1; /* override it */ 1448 } 1449 return ok; 1450 } 1451 /* 1452 ** TLSLOGERR -- log the errors from the TLS error stack 1453 ** 1454 ** Parameters: 1455 ** who -- server/client (for logging). 1456 ** 1457 ** Returns: 1458 ** none. 1459 */ 1460 1461 void 1462 tlslogerr(who) 1463 char *who; 1464 { 1465 unsigned long l; 1466 int line, flags; 1467 unsigned long es; 1468 char *file, *data; 1469 char buf[256]; 1470 # define CP (const char **) 1471 1472 es = CRYPTO_thread_id(); 1473 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags)) 1474 != 0) 1475 { 1476 sm_syslog(LOG_WARNING, NOQID, 1477 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 1478 ERR_error_string(l, buf), 1479 file, line, 1480 bitset(ERR_TXT_STRING, flags) ? data : ""); 1481 } 1482 } 1483 #endif /* STARTTLS */ 1484